Environment-friendly recycling system and method for cement chloride bypass dust

Abstract

The present application provides a cement chlorine bypass dust environmental protection recycling system and environmental protection recycling method, when recycling the chlorine bypass dust as the byproduct of cement process, preventing the pipe from scaling and carrying out the dissolving or dewatering process as the partial repeated process and continuous circulation process for more than once.

Description

Technical Field

[0001] This invention relates to an environmentally friendly recycling system and method for cement chlorine bypass dust. When recycling chlorine bypass dust, which is a byproduct of the cement process, the system prevents scaling inside the pipeline and treats the dissolution or dehydration process as a partially repeated process or a continuous cycle process. Background Technology

[0002] Typically, chlorine bypass dust is a process byproduct containing potassium chloride (KCl), quicklime (CaO), or anhydrous gypsum (CaSO4) that remains after a portion of the chlorine components that cause problems such as preheater blockage during cement preparation are extracted and bypassed.

[0003] In particular, chlorine bypass dust is inorganic matter contained in the hot air forcibly extracted at a temperature of about 1000°C in the clinker preparation kiln, which operates at a high temperature of about 2000°C in the cement production process, in order to ensure smooth operation and eliminate volatile substances containing chlorine. In addition to potassium chloride, it also contains anhydrous gypsum and quicklime that have been pre-dehydrated and decarbonated at a high temperature of 1000°C.

[0004] Chlorine bypass dust generated in the cement process is a designated waste containing high levels of alkali, especially potassium, chlorine, and heavy metals. It can almost only be disposed of by landfill. However, with the increasing cost of landfilling, research and practical applications of methods for recovering potassium chloride and utilizing sludge from cement raw materials have gradually emerged in the cement process, with the aim of saving costs.

[0005] The aforementioned recycling methods mainly focus on improving the purity, yield, heavy metal reduction, and cost reduction of calcium chloride for the commercialization of recycled products based on potassium chloride recovery, as well as the development and improvement of recycling processes for the purpose of treating sludge used as cement raw materials. These methods are not yet widely adopted in the industry.

[0006] Furthermore, the above-mentioned recycling methods have the following fatal drawbacks.

[0007] First, the above-mentioned recycling methods have the disadvantages of not being able to repeat some processes and the inability to operate the entire process continuously.

[0008] That is, the process of dissolving the chlorine bypass dust with water or acidic aqueous solution must be carried out in the front-end process, and the transfer process for the back-end processes such as separation, dehydration, and drying is carried out in the solution of the chlorine bypass dust or in the state of sludge with a water content of about 60%.

[0009] In this case, depending on the state of the material being transferred, it may be transferred by conveyor belt or by pump pressure through pipelines.

[0010] However, chlorine bypass dust, as an inorganic substance contained in the hot air forcibly extracted from the approximately 1000°C section of the clinker preparation kiln at the high temperature of approximately 2000°C in the cement production process to ensure smooth operation and eliminate volatile substances containing chlorine, contains not only large amounts of alkali and chlorine, but also considerable amounts of calcium (Ca) and sulfate (SO4). 2- When potassium chloride ions come into contact with water or acidic aqueous solutions and are transported by conveyor belts or pumps, they not only produce potassium chloride, but also calcium carbonate (CaCO3) and gypsum. As a result, scale will inevitably form on the conveyor belts or pipes. Consequently, due to partial load or blockage of the transported material, it becomes impossible to repeat some necessary processes or to operate continuously for more than the specified time of the entire process. This not only causes economic problems such as limited potassium chloride yield and increased process operating costs, but also causes fundamental limitations on the equipment.

[0011] Second, the above-mentioned recycling methods have the disadvantage of not being able to impart high added value to sludge.

[0012] That is, although sludge with a moisture content of about 60% is produced by dissolving chlorine bypass dust in water or acidic aqueous solution and then separating and dehydrating it, the potassium chloride, calcium carbonate and gypsum produced in the conveyor belt or pipeline during the process will inevitably form scale. As a result, due to partial load or blockage, it is impossible to repeat some necessary processes and to operate continuously for more than the specified time of the whole process. Therefore, it is impossible to reduce the chlorine content in the sludge to below the specified amount. It can only be put back into the cement kiln with cheap cement raw materials, which limits the recycling of high value-added materials.

[0013] Third, the above-mentioned recycling methods have the disadvantage of causing problems in wastewater generation and treatment.

[0014] After dissolving chlorine bypass dust in water or acidic aqueous solution, the mixture undergoes separation, dehydration, and drying processes to form a solution or sludge with approximately 60% water content. In this state, wastewater is inevitably generated. Depending on the amount of wastewater generated, further waste treatment, purification, drying, and evaporation processes are required. However, this incurs costs for various waste treatments, purification agents, electricity for drying, and energy costs such as liquefied natural gas (LNG). Therefore, it is not the preferred option in terms of operation and economics.

[0015] Fourth, the above-mentioned recycling methods have the disadvantage of low drying efficiency.

[0016] That is, since it mainly uses existing rotary dryers or spray dryers and other common drying methods, it has the problem of low economic efficiency, which leads to excessive energy costs such as electricity and liquefied natural gas required for drying.

[0017] Therefore, in order to solve the problems of the inability to repeat some processes and the inability to operate the entire process continuously, the inability to give sludge high added value, the problems of wastewater generation and treatment, and the problems of low drying efficiency, the applicant has, through long-term hard work, obtained an environmentally friendly recycling system and method for cement chlorine bypass dust that prevents scaling in the pipeline when recycling chlorine bypass dust, a by-product of the cement process, and performs the dissolution or dehydration process as a partially repeated process and a continuous cycle process, thus completing the present invention.

[0018] Existing technical documents

[0019] Patent documents

[0020] Korean Patent No. 10-1561637 (Patent Grant Date: October 13, 2015) Summary of the Invention

[0021] Technical issues

[0022] Therefore, the object of the present invention is to provide an environmentally friendly recycling system for cement chlorine bypass dust that prevents scaling in pipelines when recycling chlorine bypass dust, a byproduct of the cement production process, and that performs the dissolution or dehydration process as a partially repeated process or a continuous cycle process.

[0023] Furthermore, the purpose of this invention is to provide an environmentally friendly method for recycling cement chlorine bypass dust, which is a byproduct of the cement production process, by preventing scaling inside the pipeline and performing the dissolution or dehydration process as a partially repeated process or a continuous cycle process.

[0024] Furthermore, the purpose of this invention is to provide potassium chloride recovered through the above-mentioned environmentally friendly recycling system for cement chlorine bypass dust.

[0025] Furthermore, the object of the present invention is to provide sludge with reduced chlorine concentration prepared by the above-mentioned environmentally friendly recycling system for cement chlorine bypass dust.

[0026] Furthermore, the purpose of this invention is to provide potassium chloride recovered through the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust.

[0027] Furthermore, the purpose of this invention is to provide sludge with reduced chlorine concentration prepared by the above-described environmentally friendly recycling method for cement chlorine bypass dust.

[0028] The problems to be solved by this invention are not limited to those already mentioned. Those skilled in the art to which this invention pertains will clearly understand any unmentioned or other problems through the following description.

[0029] Technical solution

[0030] To address the aforementioned problems, according to one embodiment of the present invention, an environmentally friendly recycling system for cement chlorine bypass dust is provided. The system comprises: one or more dissolving mixers 120, which, after the cement chlorine bypass dust is added, dissolve the dust in at least one of water, an acidic aqueous solution, and the supernatant from a potassium chloride sedimentation tank 160 to form a slurry; a slurry dewatering machine 130, which separates the slurry dissolved in the dissolving mixer into sludge cake and dewatered filtrate; and one or more potassium chloride sedimentation tanks 160, which transfer the dewatered filtrate and recover potassium chloride through the precipitation and sedimentation of potassium chloride crystals. When transferring the slurry from the dissolving mixer 120 to the slurry dewatering machine 130, a roller vacuum type self-priming hose pump is used for pumping. The environmentally friendly recycling system for cement chlorine bypass dust prevents scaling in the pipeline by using the roller vacuum type self-priming hose pump and performs the dissolving or dewatering process as a partially repeated process or a continuous cycle process.

[0031] According to an embodiment of the present invention, the above-mentioned environmentally friendly recycling system for cement chlorine bypass dust may further include: a sludge cake storage yard 140, to which the sludge cake is transferred; one or more sludge cake dryers 150, to form sludge with reduced chlorine concentration for use as cement raw material by drying the sludge cake in the sludge cake storage yard; one or more potassium chloride dryers 170, to recover potassium chloride by drying the dehydrated filtrate; or to recover potassium chloride by transferring and drying the sediment in the potassium chloride sedimentation tank 160.

[0032] According to an embodiment of the present invention, in the above-mentioned environmentally friendly recycling system for cement chlorine bypass dust, the above-mentioned one or more dissolving mixers 120 are underground with their upper ends horizontal to the ground. The slurry is pumped out from the upper part of the above-mentioned one or more dissolving mixers 120, and the condensate from the potassium chloride dryer 170 is further added to the above-mentioned one or more dissolving mixers 120. The above-mentioned cement chlorine bypass dust can be dissolved in the condensate from the potassium chloride dryer 170.

[0033] According to one embodiment of the present invention, the sludge cake storage area 140 can be underground to the lower side of the slurry dewatering machine 130, so that the dewatered sludge cake falls, is stored or transferred to the storage area under the side of the dewatering machine.

[0034] According to an embodiment of the present invention, the sludge cake storage yard 140 is configured to add at least one selected from water, an acidic aqueous solution, condensate from the sludge cake dryer 150, and condensate from the potassium chloride dryer 170 to the sludge cake storage yard 140. The sludge cake can be mixed with at least one selected from water, an acidic aqueous solution, condensate from the sludge cake dryer 150, and condensate from the potassium chloride dryer 170 to prepare a slurry, which is then pumped to the dissolving mixer 120 by the roller vacuum type self-priming hose pump.

[0035] According to an embodiment of the present invention, the above-mentioned environmentally friendly recycling system for cement chlorine bypass dust includes: a step of preparing a slurry by dissolving the cement chlorine bypass dust in a No. 1 dissolving mixer 120 in at least one of water, an acidic aqueous solution, the supernatant from the settling tank of the potassium chloride settling tank 160, and the condensate from the potassium chloride dryer 170 as a first dissolution; a step of preparing a first sludge cake by dewatering the slurry in the slurry dewatering machine 130, allowing the first sludge cake to fall into the sludge cake storage area, and mixing the first sludge cake with at least one of water, an acidic aqueous solution, the condensate from the sludge cake dryer 150, and the condensate from the potassium chloride dryer 170 to prepare a first regenerated slurry; and a step of pumping the first regenerated slurry to a No. 2 dissolving mixer 120 using a roller vacuum type self-priming hose pump. The process of preparing slurry by dissolving the first regenerated slurry transferred to the No. 2 dissolving mixer 120 in at least one of water, an acidic aqueous solution, the supernatant from the settling tank of the potassium chloride settling tank 160, and the condensate from the potassium chloride dryer 170 as a second dissolution; and the process of preparing a second sludge cake by dewatering the slurry in the slurry dewatering machine 130, allowing the second sludge cake to fall into the sludge cake storage yard 140, and mixing the second sludge cake with at least one of water, an acidic aqueous solution, the condensate from the sludge cake dryer 150, and the condensate from the potassium chloride dryer 170 to prepare a second regenerated slurry, thereby preventing scaling in the pipelines of the environmentally friendly recycling system for cement chlorine bypass dust and performing the dissolution or dewatering process as a partially repeated process and a continuous cycle process.

[0036] According to an embodiment of the present invention, when the above-mentioned environmentally friendly recycling system for cement chlorine bypass dust performs the dissolution or dehydration process as a partially repeated process or a continuous cycle process, the dissolution time can be shortened as the number of repeated dissolution or dehydration processes increases.

[0037] According to an embodiment of the present invention, the potassium chloride precipitation tank 160 described above may be equipped with a heating device that is either constantly heating or on-demand heating via a heat pipe or a steam pipe at the bottom and sides.

[0038] According to an embodiment of the present invention, a coagulant may be added to the potassium chloride precipitation tank 160. The coagulant may contain at least one selected from quicklime (calcium hydroxide), alum, aluminum chloride, ferric oxide and ferrous sulfate as an inorganic electrolyte, or contain starch or polyacrylamide and its derivatives as organic polymer compounds.

[0039] According to an embodiment of the present invention, in order to shorten the precipitation time of potassium chloride crystals in the potassium chloride precipitation tank 160, the above-mentioned environmentally friendly recycling system for cement chlorine bypass dust can, at the same time as the precipitation and sedimentation of potassium chloride crystals from the dehydrated filtrate transferred to the potassium chloride precipitation tank 160, use a roller vacuum type self-priming hose pump or submersible pump to pump the supernatant of the potassium chloride precipitation tank 160 as the mixing water for dissolving in the dissolving mixer 120.

[0040] According to an embodiment of the present invention, in order to fundamentally eliminate the generation of wastewater, the above-mentioned environmentally friendly recycling system for cement chlorine bypass dust can transfer the condensate from the above-mentioned sludge cake dryer 150 or the condensate from the above-mentioned potassium chloride dryer 170 to be used as the mixed water for dissolving in the above-mentioned dissolving mixer 120 and the mixed water for preparing the regenerated slurry of sludge cake in the sludge cake storage yard 140.

[0041] According to an embodiment of the present invention, in the above-mentioned environmentally friendly recycling system for cement chlorine bypass dust, after the sludge cake generated in the slurry dewatering machine during the repeated process of separating and dewatering water or aqueous solution from sludge is transferred to the underground storage yard below the side of the slurry dewatering machine, the subsequent conveying line is composed of two lines: a sludge cake dryer 150 and a product sludge storage yard 180, which can be transferred separately or simultaneously.

[0042] According to an embodiment of the present invention, the above-mentioned environmentally friendly recycling system for cement chlorine bypass dust can transfer the sludge cake generated in the slurry dewatering machine during the repeated process of separating and dewatering water or aqueous solution from sludge to an underground storage yard below the side of the slurry dewatering machine, and then transfer it to a sludge cake dryer to reduce the moisture content to below 5% to prepare dried sludge for high-value-added cement auxiliary materials.

[0043] According to another embodiment of the present invention, the present invention can provide an environmentally friendly method for recycling cement chlorine bypass dust, characterized by comprising: step S110, after adding cement chlorine bypass dust to one or more dissolving mixers 120, dissolving the cement chlorine bypass dust in at least one of water, acidic aqueous solution and supernatant from a potassium chloride settling tank 160 to form a slurry; step S120, transferring the slurry dissolved in the dissolving mixer 120 to a slurry dewatering machine 130 to separate it into sludge cake and dewatered filtrate; and step S130, transferring the dewatered filtrate to one or more potassium chloride settling tanks 160 to recover potassium chloride through the precipitation and sedimentation of potassium chloride crystals. When transferring slurry from the dissolving mixer 120 to the slurry dewatering machine 130, a roller vacuum type self-priming hose pump is used to pump it out. The environmentally friendly recycling method of cement chlorine bypass dust prevents scaling in the pipeline by using the roller vacuum type self-priming hose pump to pump it out and performs the dissolving or dewatering process as a partial repeating process or a continuous cycle process.

[0044] According to an embodiment of the present invention, the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust may further include: step S140, transferring the dewatered filtrate separated in the above-mentioned slurry dewatering machine 130 to one or more potassium chloride dryers 170 and drying it to recover potassium chloride; or step S150, transferring the sediment in the above-mentioned potassium chloride sedimentation tank 160 to one or more potassium chloride dryers 170 and drying it to recover potassium chloride.

[0045] According to an embodiment of the present invention, the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust may further include: step S160, transferring the above-mentioned sludge cake to a sludge cake storage yard 140 to prepare sludge for use as raw material for a firing kiln; or step S170, transferring the above-mentioned sludge cake to a sludge cake dryer 150 to prepare dried sludge for use as cement auxiliary material.

[0046] According to an embodiment of the present invention, the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust may further include: step S180, placing the supernatant of the potassium chloride sedimentation tank 160 or the condensate of the potassium chloride dryer 170 together with water or an acidic aqueous solution into the dissolving mixer 120; or step S190, after placing the condensate of the potassium chloride dryer 170 or the condensate of the sludge cake dryer 150 into the sludge cake storage area 140, placing at least one of water, an acidic aqueous solution, the condensate of the sludge cake dryer 150 and the condensate of the potassium chloride dryer 170 into the sludge cake in the sludge cake storage area 140 to prepare a recycled slurry, and then transferring the recycled slurry into the dissolving mixer 120.

[0047] According to an embodiment of the present invention, in the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust, the above-mentioned one or more dissolving mixers 120 are underground with their upper ends horizontal to the ground. The slurry is pumped out from the upper part of the above-mentioned one or more dissolving mixers 120, and the condensate from the potassium chloride dryer 170 is further added to the above-mentioned one or more dissolving mixers 120. The above-mentioned cement chlorine bypass dust can be dissolved in the condensate from the potassium chloride dryer 170.

[0048] According to an embodiment of the present invention, a coagulant may be added to the potassium chloride precipitation tank 160. The coagulant may contain at least one selected from quicklime (calcium hydroxide), alum, aluminum chloride, ferric oxide and ferrous sulfate as an inorganic electrolyte, or contain starch or polyacrylamide and its derivatives as organic polymer compounds.

[0049] According to an embodiment of the present invention, in order to shorten the precipitation time of potassium chloride crystals in the potassium chloride precipitation tank 160, the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust can simultaneously precipitate and settle potassium chloride crystals from the dehydrated filtrate transferred to the potassium chloride precipitation tank 160, and at the time point when the supernatant of the precipitation tank is generated, use a roller vacuum type self-priming hose pump or submersible pump to pump the supernatant of the potassium chloride precipitation tank 160 as the mixing water for dissolving in the dissolving mixer 120.

[0050] According to one embodiment of the present invention, the sludge cake storage area 140 can be moved underground to the lower side of the slurry dewatering machine 130 so that the dewatered sludge cake can fall, be stored or transferred to the storage area at the lower side of the dewatering machine.

[0051] According to an embodiment of the present invention, the sludge cake storage area 140 can be configured to add at least one of water, an acidic aqueous solution, condensate from the sludge cake dryer 150, and condensate from the potassium chloride dryer 170 to the sludge cake storage area 140. The sludge cake can be mixed with at least one of water, an acidic aqueous solution, condensate from the sludge cake dryer 150, and condensate from the potassium chloride dryer 170 to prepare a slurry, which is then pumped to the dissolving mixer 120 by the roller vacuum type self-priming hose pump.

[0052] According to an embodiment of the present invention, the environmentally friendly recycling method for the above-mentioned cement chlorine bypass dust includes: as a first dissolution, dissolving the cement chlorine bypass dust in a No. 1 dissolution mixer 120 in at least one selected from water, an acidic aqueous solution, the supernatant from the settling tank of the potassium chloride settling tank 160, and the condensate from the potassium chloride dryer 170 to prepare a slurry; as a first dewatering, dewatering the slurry in the slurry dewatering machine 130 to prepare a first sludge cake, allowing the first sludge cake to fall into the sludge cake storage area, and mixing the first sludge cake with at least one selected from water, an acidic aqueous solution, the condensate from the sludge cake dryer 150, and the condensate from the potassium chloride dryer 170 to prepare a first regenerated slurry; and pumping the above-mentioned cement chlorine bypass dust into a No. 2 dissolution mixer 120 using a roller vacuum type self-priming hose pump. The process includes: a first regenerated slurry step; a second dissolution step in which the first regenerated slurry transferred to the No. 2 dissolution mixer 120 is dissolved in at least one of water, an acidic aqueous solution, the supernatant from the potassium chloride settling tank 160, and the condensate from the potassium chloride dryer 170 to prepare a slurry; and a second dewatering step in which the slurry is dewatered by the slurry dewatering machine 130 to prepare a second sludge cake, and the second sludge cake is dropped into the sludge cake storage yard 140, and then the second sludge cake is mixed with at least one of water, an acidic aqueous solution, the condensate from the sludge cake dryer 150, and the condensate from the potassium chloride dryer 170 to prepare a second regenerated slurry. This process prevents scaling in the pipeline and performs the dissolution or dewatering steps as a partially repeated step or a continuous cycle step.

[0053] According to an embodiment of the present invention, in the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust, when the dissolution or dehydration process is performed as a partially repeated process or a continuous cycle process, the dissolution time can be shortened as the number of repeated dissolution or dehydration processes increases.

[0054] According to an embodiment of the present invention, the potassium chloride precipitation tank 160 described above may be equipped with a heating device that is either constantly heating or on-demand heating via a heat pipe or a steam pipe at the bottom and sides.

[0055] According to an embodiment of the present invention, in order to fundamentally eliminate the generation of wastewater, the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust can transfer the condensate from the above-mentioned sludge cake dryer 150 or the condensate from the above-mentioned potassium chloride dryer 170 to be used as the mixed water for dissolving in the above-mentioned dissolving mixer 120 and the mixed water for preparing the regenerated slurry of sludge cake in the sludge cake storage yard 140.

[0056] According to an embodiment of the present invention, in the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust, after the sludge cake generated in the slurry dewatering machine during the repeated separation and dewatering of water or aqueous solution and sludge is transferred to the underground storage yard at the lower side of the slurry dewatering machine, the subsequent conveying line is composed of two lines: a sludge cake dryer 150 and a product sludge storage yard 180, which can be transferred separately or simultaneously.

[0057] According to an embodiment of the present invention, the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust can be used to prepare dried sludge for high-value-added cement auxiliary materials by transferring the sludge cake generated in the slurry dewatering machine during the repeated separation and dewatering process of water or aqueous solution with sludge to the underground storage yard below the side of the slurry dewatering machine, and then to the sludge cake dryer to reduce the moisture content to below 5%.

[0058] According to another embodiment of the present invention, the present invention provides potassium chloride recovered through the above-described environmentally friendly recycling system for cement chlorine bypass dust.

[0059] According to another embodiment of the present invention, the present invention provides sludge with reduced chlorine concentration prepared by the above-described environmentally friendly recycling system for cement chlorine bypass dust.

[0060] According to another embodiment of the present invention, the present invention provides potassium chloride recovered by the above-described environmentally friendly recycling method for cement chlorine bypass dust.

[0061] According to another embodiment of the present invention, the present invention provides sludge with reduced chlorine concentration prepared by the above-described environmentally friendly recycling method for cement chlorine bypass dust.

[0062] The effects of the invention

[0063] According to the present invention, an environmentally friendly recycling system is provided for cement chlorine bypass dust that is a byproduct of the cement production process, which prevents scaling in the pipeline and performs the dissolution or dehydration process as a partially repeated process or a continuous cycle process, and has excellent recycling efficiency.

[0064] Furthermore, the present invention provides an environmentally friendly recycling method for cement chlorine bypass dust that prevents scaling in pipelines when recycling chlorine bypass dust, a byproduct of the cement process, and treats the dissolution or dehydration process as a partially repeated process or a continuous cycle process. The process is significantly stable and economical.

[0065] Furthermore, the present invention provides an environmentally friendly recycling system for the recovery of potassium chloride through the aforementioned cement chlorine bypass dust, which is economical.

[0066] Furthermore, the present invention provides sludge with reduced chlorine concentration prepared by the above-mentioned environmentally friendly recycling system for cement chlorine bypass dust, which is economical.

[0067] Furthermore, the present invention provides an environmentally friendly method for recycling potassium chloride using the aforementioned cement chlorine bypass dust, which is economical.

[0068] Furthermore, the present invention provides sludge with reduced chlorine concentration prepared by the above-mentioned environmentally friendly recycling method of cement chlorine bypass dust, which is economical.

[0069] The effects of this invention are not limited to those described above, but should be understood to include all effects that can be inferred from the detailed description of the invention or the structure of the invention as described in the claims. Attached Figure Description

[0070] Figure 1 This is a simplified block diagram of an environmentally friendly recycling system for cement chlorine bypass dust according to an embodiment of the present invention.

[0071] Figure 2 This is a process flow diagram of an environmentally friendly recycling method for cement chlorine bypass dust according to an embodiment of the present invention. Detailed Implementation

[0072] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0073] The advantages, features, and methods of implementing the present invention will become clear with reference to the accompanying drawings and the detailed embodiments described below.

[0074] However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms. The following embodiments are only used to make the disclosure of the present invention more complete, and are provided to enable those skilled in the art to fully understand the scope of the present invention. The present invention is defined only by the scope of the claims.

[0075] Furthermore, in the description of this invention, if it is determined that related prior art or the like may obscure the essence of this invention, its detailed description will be omitted.

[0076] The present invention will now be described in detail.

[0077] Environmentally friendly recycling system for cement chlorine bypass dust

[0078] This invention provides an environmentally friendly recycling system for cement chlorine bypass dust that prevents scaling in pipelines when recycling chlorine bypass dust, a byproduct of cement production, and that performs the dissolution or dehydration process as a partially repeated process or a continuous cycle process.

[0079] The environmentally friendly recycling system for cement chlorine bypass dust of the present invention includes: one or more dissolving mixers 120, which, after the cement chlorine bypass dust is added, dissolve the cement chlorine bypass dust in at least one of water, acidic aqueous solution, and supernatant from a potassium chloride sedimentation tank 160 to form a slurry; a slurry dewatering machine 130, which separates the slurry dissolved in the dissolving mixer into sludge cake and dewatered filtrate; and one or more potassium chloride sedimentation tanks 160, which transfer the dewatered filtrate and recover potassium chloride through the precipitation and sedimentation of potassium chloride crystals. When transferring the slurry from the dissolving mixer 120 to the slurry dewatering machine 130, a roller vacuum type self-priming hose pump is used to pump it out. The environmentally friendly recycling system for cement chlorine bypass dust can prevent scaling in the pipeline by using the roller vacuum type self-priming hose pump and can perform the dissolution or dewatering process as a partial repeat process or a continuous cycle process.

[0080] This invention provides an environmentally friendly recycling system for cement chlorine bypass dust, which is a byproduct of the cement production process, to prevent scaling in pipelines and to treat the dissolution or dehydration process as a partially repeated process or a continuous cycle process. The system has excellent recycling efficiency.

[0081] Furthermore, the aforementioned environmentally friendly recycling system for cement chlorine bypass dust may also include: a sludge cake storage yard 140, where the sludge cake is transferred; one or more sludge cake dryers 150, which dry the sludge cake in the sludge cake storage yard to form sludge with reduced chlorine concentration for use as cement raw material; one or more potassium chloride dryers 170, which dry the dehydrated filtrate to recover potassium chloride; or one or more potassium chloride dryers 170, which transfer and dry the sediment in the potassium chloride sedimentation tank 160 to recover potassium chloride.

[0082] Typically, chlorine bypass dust is a process byproduct containing potassium chloride, quicklime, or anhydrous gypsum, which is left over after a portion of the chlorine components that cause problems such as preheater blockage during cement preparation are extracted and bypassed.

[0083] In particular, chlorine bypass dust is inorganic matter contained in the hot air forcibly extracted at a temperature of about 1000°C in the clinker preparation kiln, which operates at a high temperature of about 2000°C in the cement production process, in order to ensure smooth operation and eliminate volatile substances containing chlorine. In addition to potassium chloride, it also contains anhydrous gypsum and quicklime that have been pre-dehydrated and decarbonated at a high temperature of 1000°C.

[0084] Chlorine bypass dust generated in the cement process is a designated waste containing high levels of alkali, especially potassium, chlorine, and heavy metals. It can almost only be disposed of by landfill. However, with the increasing cost of landfilling, research and practical applications of methods for recovering potassium chloride and utilizing sludge from cement raw materials have gradually emerged in the cement process, with the aim of saving costs.

[0085] The aforementioned recycling methods mainly focus on improving the purity, yield, heavy metal reduction, and cost reduction of calcium chloride for the commercialization of recycled products based on potassium chloride recovery, as well as the development and improvement of recycling processes for the purpose of treating sludge used as cement raw materials. Most of these methods have not been widely adopted in the industry.

[0086] Furthermore, the above-mentioned recycling methods have the following fatal drawbacks.

[0087] First, the above-mentioned recycling methods have the disadvantages of not being able to repeat some processes and the inability to operate the entire process continuously.

[0088] That is, the process of dissolving the chlorine bypass dust with water or acidic aqueous solution must be carried out in the front-end process, and the transfer process for the back-end processes such as separation, dehydration, and drying is carried out in the solution of the chlorine bypass dust or in the state of sludge with a water content of about 60%.

[0089] In this case, depending on the state of the material being transferred, it may be transferred by conveyor belt or by pump pressure through pipelines.

[0090] However, chlorine bypass dust, as an inorganic substance contained in the hot air forcibly extracted from the approximately 1000°C section of the clinker preparation kiln at a high temperature of approximately 2000°C in the cement production process to ensure smooth operation and eliminate volatile substances containing chlorine, contains not only a large amount of alkali and chlorine, but also a considerable amount of calcium and sulfate ions. When it comes into contact with water or acidic aqueous solutions and is transferred by conveyor belt or pumped through pipelines, it not only produces potassium chloride, but also calcium carbonate and gypsum. Therefore, scaling will inevitably occur on the conveyor belt or pipeline. As a result, the partial load or blockage of the transferred material makes it impossible to repeat some necessary processes or to continuously operate the entire process for a specified time. This not only leads to the problem of reduced economic efficiency, such as increased potassium chloride yield and increased process operating costs, but also causes limitations at the source of the equipment.

[0091] Second, the above-mentioned recycling methods have the disadvantage of not being able to impart high added value to sludge.

[0092] That is, although sludge with a moisture content of about 60% is produced by dissolving chlorine bypass dust in water or acidic aqueous solution and then separating and dehydrating it, the potassium chloride, calcium carbonate and gypsum produced in the conveyor belt or pipeline during the process will inevitably form scale. As a result, due to partial load or blockage, it is impossible to repeat some necessary processes and to operate continuously for more than the specified time of the whole process. Therefore, it is impossible to reduce the chlorine content in the sludge to below the specified amount. It can only be put back into the cement kiln with cheap cement raw materials, which limits the recycling of high value-added materials.

[0093] Third, the above-mentioned recycling methods have the disadvantage of causing problems in wastewater generation and treatment.

[0094] After dissolving chlorine bypass dust in water or acidic aqueous solution, the mixture undergoes separation, dehydration, and drying processes to form a solution or sludge with approximately 60% water content. In this state, wastewater is inevitably generated. Depending on the amount of wastewater generated, further waste treatment, purification, drying, and evaporation processes are required. However, this incurs costs for various waste treatments, purification agents, electricity for drying, and energy costs such as liquefied natural gas (LNG). Therefore, it is not the preferred option in terms of operation and economics.

[0095] Fourth, the above-mentioned recycling methods have the disadvantage of low drying efficiency.

[0096] That is, since it mainly uses existing rotary dryers or spray dryers and other common drying methods, it has the problem of low economic efficiency, which leads to excessive energy costs such as electricity and liquefied natural gas required for drying.

[0097] Therefore, in order to solve the problems of the inability to repeat some processes and the inability to operate the entire process continuously, the inability to give sludge high added value, the problems of wastewater generation and treatment, and the problems of low drying efficiency, the applicant has, through long-term hard work, obtained an environmentally friendly recycling system and method for cement chlorine bypass dust that prevents scaling in the pipeline when recycling chlorine bypass dust, a by-product of the cement process, and performs the dissolution or dehydration process as a partially repeated process and a continuous cycle process, thus completing the present invention.

[0098] Figure 1 This is a simplified block diagram of an environmentally friendly recycling system for cement chlorine bypass dust according to an embodiment of the present invention.

[0099] Reference Figure 1 It includes a chlorine bypass dust storage area 100 and a chlorine bypass dust placement device 110 for transporting out chlorine bypass dust.

[0100] Furthermore, the mixture includes one or more dissolving mixers 120, which, after adding cement chlorine bypass dust, dissolve the cement chlorine bypass dust in at least one of water, acidic aqueous solution, supernatant from the sedimentation tank of potassium chloride sedimentation tank 160, and condensate from the dryer of potassium chloride dryer 170 to form a slurry.

[0101] Furthermore, it includes: a slurry dewatering machine 130, which separates the slurry dissolved in the aforementioned dissolving mixer into sludge cake and dewatered filtrate; and a sludge cake storage yard 140, to which the aforementioned sludge cake is transferred.

[0102] Furthermore, it includes one or more sludge cake dryers 150, which dry the sludge cakes in the aforementioned sludge cake storage area to form sludge with reduced chlorine concentration that can be used as a cement raw material.

[0103] Furthermore, it includes: one or more potassium chloride sedimentation tanks 160 for transferring the above-mentioned dehydrated filtrate and recovering potassium chloride by precipitation and sedimentation of potassium chloride crystals; one or more potassium chloride dryers 170 for recovering potassium chloride by drying the above-mentioned dehydrated filtrate; and one or more potassium chloride dryers 170 for recovering potassium chloride by transferring and drying the sediment precipitated in the above-mentioned potassium chloride sedimentation tanks.

[0104] Moreover, the aforementioned environmentally friendly recycling system for cement chlorine bypass dust can prevent scaling inside the pipeline when recycling chlorine bypass dust, which is a byproduct of the cement process, and can perform the dissolution or dehydration process as a partially repeated process or a continuous cycle process.

[0105] Among them, the above-mentioned repeated processes can be repeated 1 to 6 times.

[0106] In this case, the recycling efficiency of the cement chlorine bypass dust can be increased with the increase of the number of repetitions of the above-mentioned repetitive processes.

[0107] Moreover, the aforementioned continuous cycle process can be a process in which the dissolving, dehydrating, or drying processes are continuously cycled more than once.

[0108] In this case, when the slurry is transferred from the dissolving mixer 120 to the slurry dewatering machine 130, it can be pumped out by a roller vacuum type self-priming hose pump, and the slurry can be pumped out from the top of the dissolving mixer 120.

[0109] Furthermore, in addition to a large amount of alkali and chlorine, the aforementioned chlorine bypass dust also contains a considerable amount of calcium and sulfate ions. When it comes into contact with water or acidic aqueous solution and is transported by conveyor belt or pumped through pipeline, it not only produces potassium chloride, but also calcium carbonate and gypsum, thus inevitably causing scaling in the conveyor belt or pipeline.

[0110] Among them, the above-mentioned roller vacuum type self-priming hose pump can use the expansion and contraction of the high-pressure vacuum tube and the compression roller that can move in both the forward and reverse directions to allow slurry and regenerated slurry to enter from the suction port and be discharged through the discharge port.

[0111] Therefore, the aforementioned roller vacuum type self-priming hose pump fundamentally prevents the partial carrying and blockage of solid components during the transfer process caused by scale formed in the conveyor belt or pipeline, thus enabling the repetition of some or all processes and continuous operation of all processes for a specified time or more.

[0112] Furthermore, the aforementioned sludge cake dryer 150 may include a vertical cylindrical continuous dryer.

[0113] The entire surface of the vertical cylindrical continuous dryer used for drying sludge cake can be a drying profile. The sludge cake, when fed into the vertical cylindrical continuous dryer, is dried while being attached to the entire surface of the dryer in the form of a thin film under the action of centrifugal force. Sludge can be dried into a thin film in this way.

[0114] Among them, the thermal efficiency of the vertical cylindrical continuous dryer for drying sludge cake is more than twice that of the existing rotary dryer or spray dryer. The evaporated steam is fully recovered as condensate to replace the mixed water, so no wastewater is generated, thereby significantly improving the economic efficiency of the process operation.

[0115] Furthermore, the potassium chloride dryer 170 described above may include a vertical cylindrical continuous dryer.

[0116] The entire surface of the vertical cylindrical continuous dryer for potassium chloride drying can be a drying profile. The sludge cake fed into the vertical cylindrical continuous dryer is dried in the form of a thin film attached to the entire surface of the vertical cylindrical continuous dryer under the action of centrifugal force. Sludge can be dried into a thin film in this way.

[0117] Among them, the thermal efficiency of the vertical cylindrical continuous dryer for potassium chloride drying is more than twice that of the existing rotary dryer or spray dryer. The evaporated steam is fully recovered as condensate to replace the mixed water, so no wastewater is generated, thereby significantly improving the economic efficiency of the process operation.

[0118] Furthermore, in the above-mentioned environmentally friendly recycling system for cement chlorine bypass dust, the above-mentioned one or more dissolving mixers 120 are underground with their upper ends horizontal to the ground. The slurry is pumped out from the upper part of the above-mentioned one or more dissolving mixers 120 and further fed into the above-mentioned one or more dissolving mixers 120 with the condensate from the potassium chloride dryer 170. The above-mentioned cement chlorine bypass dust can be dissolved in the condensate from the potassium chloride dryer 170.

[0119] Furthermore, when transferring the slurry from the aforementioned dissolving mixer 120 to the aforementioned slurry dewatering machine 130, the aforementioned roller vacuum type self-priming hose pump can be used to pump it out, and the slurry can be pumped out from the top of the aforementioned dissolving mixer 120 to the conveyor line.

[0120] Furthermore, the aforementioned sludge cake storage area 140 can be moved underground to the lower side of the aforementioned slurry dewatering machine 130 so that the dewatered sludge cake can fall, be stored, or transferred to the storage area at the lower side of the dewatering machine.

[0121] Furthermore, the aforementioned sludge cake storage area 140 is configured to add at least one of the following: water, acidic aqueous solution, condensate from the aforementioned sludge cake dryer 150, and condensate from the aforementioned potassium chloride dryer 170. The sludge cake can be mixed with at least one of the following to prepare a slurry, which is then pumped to the aforementioned dissolving mixer 120 via the aforementioned roller vacuum type self-priming hose pump.

[0122] The dissolving agitator used to dissolve chlorine bypass dust in water or acidic aqueous solution can be underground with its upper end level with the ground. This is to allow the sludge cake storage area generated in the slurry dewatering machine to be underground to the lower side of the slurry dewatering machine, and then the sludge cake is mixed with water or acidic aqueous solution to slurry it. This minimizes the height difference between the lower part of the sludge cake storage area and the upper part of the dissolving agitator when it is transferred to the next dissolving agitator, thereby increasing the ease of transfer and improving the operating rate.

[0123] Furthermore, the conveyor line used for transferring the slurry after mixing in a dissolving mixer to dissolve chlorine bypass dust in water or an acidic aqueous solution is configured to pump the slurry out from the top of the dissolving mixer. This is to prevent pipe blockages that often occur when the slurry concentration is too high at the bottom of the mixer when the slurry is pumped out from the bottom.

[0124] The aforementioned environmentally friendly recycling system for cement chlorine bypass dust includes: a first dissolution step in which the cement chlorine bypass dust is dissolved in at least one of water, an acidic aqueous solution, the supernatant from the sedimentation tank of the potassium chloride sedimentation tank 160, and the condensate from the potassium chloride dryer 170 to prepare a slurry; a first dewatering step in which the slurry is dewatered by the slurry dewatering machine 130 to prepare a first sludge cake, and after the first sludge cake falls into the sludge cake storage area, it is mixed with at least one of water, an acidic aqueous solution, the condensate from the sludge cake dryer 150, and the condensate from the potassium chloride dryer 170 to prepare a first regenerated slurry; a second step in which the first regenerated slurry is pumped to the second dissolution mixer 120 by a roller vacuum self-priming hose pump; and a third step in which the first regenerated slurry is pumped to the second dissolution mixer 120 by a roller vacuum self-priming hose pump. The process of secondary dissolution involves dissolving the first regenerated slurry transferred to the No. 2 dissolution mixer 120 in at least one of water, an acidic aqueous solution, the supernatant from the settling tank of the potassium chloride settling tank 160, and the condensate from the potassium chloride dryer 170 to prepare a slurry; and the process of secondary dewatering involves dewatering the slurry in the slurry dewatering machine 130 to prepare a second sludge cake, allowing the second sludge cake to fall into the sludge cake storage area 140, and then mixing the second sludge cake with at least one of water, an acidic aqueous solution, the condensate from the sludge cake dryer 150, and the condensate from the potassium chloride dryer 170 to prepare a second regenerated slurry. This process prevents scaling in the pipelines of the environmentally friendly recycling system for cement chlorine bypass dust and performs the dissolution or dewatering process as a partially repeated process and a continuous cycle process.

[0125] Among them, the above-mentioned continuous cycle process or partially repeated process can be 1 to 6 times.

[0126] In this case, the recycling efficiency of the cement chlorine bypass dust can be increased with the increase of the number of repetitions of the above-mentioned repetitive processes.

[0127] Furthermore, the dissolution-dehydration-drying process can be carried out by dissolving the cement chlorine bypass dust in at least one of the following: water, the supernatant of a potassium chloride sedimentation tank selected from an acidic aqueous solution, and the condensate of a potassium chloride dryer, after the cement chlorine bypass dust is placed into the dissolution mixer to form a slurry.

[0128] Afterwards, a slurry dewatering machine can be used to dewater the slurry dissolved in the above-mentioned dissolving mixer to separate it into sludge cake and dewatered filtrate.

[0129] In this case, when transferring slurry from the aforementioned dissolving mixer to the aforementioned slurry dewatering machine, a roller vacuum type self-priming hose pump can be used to pump it out, and the slurry can be pumped out from the top of the aforementioned dissolving mixer to the conveyor line.

[0130] Then, the sludge cake can be transferred to a sludge cake storage facility to prepare sludge for the firing kiln.

[0131] Furthermore, the aforementioned sludge cake can be transferred to a sludge cake dryer to prepare dried sludge for use as a cement auxiliary material with reduced chlorine concentration, which can be used as a cement raw material.

[0132] Then, the above dehydrated filtrate can be transferred to a potassium chloride precipitation tank to allow potassium chloride to precipitate and settle, thereby recovering potassium chloride.

[0133] Furthermore, the dehydrated filtrate can be transferred to a potassium chloride dryer and dried to recover potassium chloride.

[0134] Furthermore, the sediment precipitated in the potassium chloride sedimentation tank can be transferred to a potassium chloride dryer and dried to recover potassium chloride.

[0135] Under these conditions, the conveyor lines will hardly get clogged and will hardly produce any wastewater.

[0136] Furthermore, in the secondary repeated process of dissolution-dehydration, as the first dissolution, cement chlorine bypass dust can be put into No. 1 dissolution mixer, and the cement chlorine bypass dust can be dissolved in at least one of water, acidic aqueous solution, supernatant from a potassium chloride sedimentation tank, and condensate from a potassium chloride dryer to form a slurry.

[0137] Subsequently, as the first dewatering step, a slurry dewatering machine can be used to dewater the slurry dissolved in the No. 1 dissolving mixer to separate it into the first sludge cake and the first dewatered filtrate.

[0138] In this case, when transferring slurry from the No. 1 dissolving mixer to the slurry dewatering machine, a roller vacuum type self-priming hose pump can be used to pump it out, and the slurry can be pumped out from the top of the No. 1 dissolving mixer to the conveyor line.

[0139] Then, after the first sludge cake is dropped into the sludge cake storage area, the first sludge cake can be mixed with at least one selected from water, acidic aqueous solution, condensate from the sludge cake dryer, and condensate from the potassium chloride dryer to prepare a first regenerated slurry.

[0140] In this case, the first regenerated slurry can be pumped to the No. 2 dissolving mixer using a roller vacuum self-priming hose pump.

[0141] Then, as a second dissolution, the first regenerated slurry transferred to the above-mentioned No. 2 dissolution mixer can be dissolved in at least one of water, acidic aqueous solution, supernatant from the above-mentioned potassium chloride precipitation tank, and condensate from the above-mentioned potassium chloride dryer to prepare a slurry.

[0142] Subsequently, as a second dewatering process, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 2 dissolving mixer to separate it into a second sludge cake and a second dewatered filtrate.

[0143] Then, after the second sludge cake is dropped into the sludge cake storage area, sludge for the firing kiln can be prepared.

[0144] Furthermore, the aforementioned second sludge cake can be transferred to a sludge cake dryer to prepare dried sludge for use as a cement auxiliary material with reduced chlorine concentration as a cement raw material.

[0145] In this case, the first dehydrated filtrate and the second dehydrated filtrate can be transferred to a potassium chloride precipitation tank to allow potassium chloride to precipitate and settle, thereby recovering potassium chloride.

[0146] Furthermore, the first and second dehydrated filtrates can be transferred to a potassium chloride dryer and dried to recover potassium chloride.

[0147] Furthermore, the sediment precipitated in the potassium chloride sedimentation tank can be transferred to a potassium chloride dryer and dried to recover potassium chloride.

[0148] Under these conditions, the conveyor lines will hardly get clogged and will hardly produce any wastewater.

[0149] Furthermore, in the three-part repetitive dissolution-dehydration process, as the first dissolution, cement chlorine bypass dust can be placed into dissolution mixer No. 1, and the cement chlorine bypass dust can be dissolved in at least one of water, acidic aqueous solution, supernatant from the potassium chloride sedimentation tank, and condensate from the potassium chloride dryer to form a slurry.

[0150] Subsequently, as the first dewatering step, a slurry dewatering machine can be used to dewater the slurry dissolved in the No. 1 dissolving mixer to separate it into the first sludge cake and the first dewatered filtrate.

[0151] In this case, when transferring slurry from the No. 1 dissolving mixer to the slurry dewatering machine, a roller vacuum type self-priming hose pump can be used to pump it out, and the slurry can be pumped out from the top of the No. 1 dissolving mixer to the conveyor line.

[0152] Then, after the first sludge cake is dropped into the sludge cake storage area, the first sludge cake can be mixed with at least one selected from water, acidic aqueous solution, condensate from the sludge cake dryer, and condensate from the potassium chloride dryer to prepare a first regenerated slurry.

[0153] In this case, the first regenerated slurry can be pumped to the No. 2 dissolving mixer using a roller vacuum self-priming hose pump.

[0154] Then, as a second dissolution, the first regenerated slurry transferred to the above-mentioned No. 2 dissolution mixer can be dissolved in at least one of water, acidic aqueous solution, supernatant from the above-mentioned potassium chloride precipitation tank, and condensate from the above-mentioned potassium chloride dryer to prepare a slurry.

[0155] Subsequently, as a second dewatering process, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 2 dissolving mixer to separate it into a second sludge cake and a second dewatered filtrate.

[0156] Then, after the second sludge cake is dropped into the sludge cake storage area, the second sludge cake is mixed with at least one selected from water, acidic aqueous solution, condensate from the sludge cake dryer, and condensate from the potassium chloride dryer to prepare a second regenerated slurry.

[0157] In this case, the aforementioned second regenerated slurry can be pumped to the No. 3 dissolving mixer using a roller vacuum self-priming hose pump.

[0158] Subsequently, as a third dissolution, the second regenerated slurry transferred to the aforementioned No. 3 dissolution mixer is dissolved in at least one of water, an acidic aqueous solution, the supernatant from the aforementioned potassium chloride precipitation tank, and the condensate from the aforementioned potassium chloride dryer to prepare a slurry.

[0159] Then, as a third dewatering step, a slurry dewatering machine can be used to dewater the slurry dissolved in the No. 3 dissolving mixer to separate it into a third sludge cake and a third dewatered filtrate.

[0160] Afterwards, sludge for the firing kiln can be prepared after the third sludge cake is dropped into the sludge cake storage area.

[0161] Furthermore, the aforementioned third sludge cake can be transferred to a sludge cake dryer to prepare dried sludge for use as a cement auxiliary material with reduced chlorine concentration as a cement raw material.

[0162] In this case, the first dehydrated filtrate, the second dehydrated filtrate, and the third dehydrated filtrate can be transferred to a potassium chloride precipitation tank to allow potassium chloride to precipitate and settle, thereby recovering potassium chloride.

[0163] Furthermore, the first dehydrated filtrate, the second dehydrated filtrate, and the third dehydrated filtrate can be transferred to a potassium chloride dryer and dried to recover potassium chloride.

[0164] Furthermore, the sediment precipitated in the potassium chloride sedimentation tank can be transferred to a potassium chloride dryer and dried to recover potassium chloride.

[0165] Under these conditions, the conveyor lines will hardly get clogged and will hardly produce any wastewater.

[0166] Moreover, in the above-mentioned environmentally friendly recycling system for cement chlorine bypass dust, when the dissolution or dehydration process is carried out as a partially repeated process or a continuous cycle process, the dissolution time can be shortened as the number of repeated dissolution or dehydration processes increases.

[0167] Furthermore, the potassium chloride precipitation tank 160 can be equipped with a heating device that is either constantly heating or on-demand heating via heat pipes or steam pipes at the bottom and sides.

[0168] Furthermore, a coagulant can be added to the potassium chloride precipitation tank 160. The coagulant may contain at least one inorganic electrolyte selected from quicklime (calcium hydroxide), alum, aluminum chloride, ferric oxide and ferrous sulfate, or may contain starch or polyacrylamide and its derivatives as organic polymer compounds.

[0169] Furthermore, in order to shorten the precipitation time of potassium chloride crystals in the potassium chloride precipitation tank 160, the above-mentioned environmental protection recycling system for cement chlorine bypass dust uses a roller vacuum type self-priming hose pump or submersible pump to pump the supernatant of the potassium chloride precipitation tank 160 as the mixing water for dissolving in the dissolving mixer 120, while the potassium chloride crystals are precipitated and settled from the dehydrated filtrate transferred to the potassium chloride precipitation tank 160.

[0170] In the repeated process of dissolving chlorine bypass dust in water or acidic aqueous solution → separating and dewatering water or aqueous solution with sludge, the subsequent conveying line of the dewatered filtrate generated in the slurry dewatering machine can be divided into two lines, a potassium chloride sedimentation tank and a potassium chloride dryer, regardless of the number of dewatering cycles, so that they can be transferred separately or simultaneously.

[0171] Furthermore, during the repeated process of dissolving chlorine bypass dust in water or an acidic aqueous solution → separating and dewatering the water or aqueous solution with the sludge, the dewatered filtrate produced in the slurry dewatering machine can be transferred to the potassium chloride sedimentation tank. This is to minimize the operating procedures of the potassium chloride dryer or to maximize the economic benefits of improving drying efficiency.

[0172] Furthermore, to facilitate water evaporation, the bottom and sides of the potassium chloride sedimentation tank can be equipped with heating devices such as heat pipes or steam pipes, which can be used continuously or at any time. This is to adjust the crystal precipitation time of potassium chloride by whether the heating device is operating or not, based on the change in the time required for the supersaturation of potassium chloride to evaporate through the dehydrated filtrate.

[0173] Furthermore, to further shorten the precipitation time of potassium chloride crystals, the aforementioned coagulant can be added to the dehydrated filtrate transferred to the potassium chloride precipitation tank, and the amount added can be adjusted. This is to promote sedimentation by accelerating the settling speed of the potassium chloride particles precipitated in the liquid.

[0174] Furthermore, in order to further shorten the precipitation time of potassium chloride crystals, the supernatant can be removed by using a roller vacuum self-priming hose pump at the point when potassium chloride crystals precipitate and settle in the dehydrated filtrate transferred to the potassium chloride precipitation tank and supernatant is generated, or it can be transferred to a dissolving mixer for use as a dissolving mixed water.

[0175] In order to fundamentally eliminate the generation of wastewater, the environmentally friendly recycling system for cement chlorine bypass dust can transfer the condensate from the sludge cake dryer 150 or the condensate from the potassium chloride dryer 170 to be used as the mixing water for dissolving in the dissolving mixer 120 and the mixing water for preparing the regenerated slurry of sludge cake in the sludge cake storage yard 140.

[0176] Moreover, the aforementioned environmentally friendly recycling system for cement chlorine bypass dust can transfer the sludge cake generated in the slurry dewatering machine during the repeated process of separating and dewatering water or aqueous solution from sludge to an underground storage yard below the side of the slurry dewatering machine, and then transfer it to a sludge cake dryer to reduce the moisture content to below 5% to prepare dried sludge for high-value-added cement auxiliary materials.

[0177] In the repeated process of separating and dewatering water or aqueous solution from sludge, the sludge cake generated in the slurry dewatering machine is transferred to the underground storage yard below the side of the slurry dewatering machine. The subsequent conveyor line consists of two lines: the sludge cake dryer and the product sludge storage yard, which can be transferred separately or simultaneously.

[0178] Environmentally friendly recycling methods for cement chlorine bypass dust

[0179] This invention provides an environmentally friendly method for recycling cement chlorine bypass dust, which is a byproduct of the cement production process, by preventing scaling in pipelines and treating the dissolution or dehydration process as a partially repeated process or a continuous cycle process.

[0180] The environmentally friendly recycling method for cement chlorine bypass dust of the present invention includes: step S110, after adding cement chlorine bypass dust to one or more dissolving mixers 120, dissolving the cement chlorine bypass dust in at least one of water, acidic aqueous solution and supernatant from a potassium chloride sedimentation tank 160 to form a slurry; step S120, transferring the slurry dissolved in the dissolving mixer 120 to a slurry dewatering machine 130 to separate it into sludge cake and dewatered filtrate; and step S130, transferring the dewatered filtrate to one or more potassium chloride sedimentation tanks 160 to recover potassium chloride through the precipitation and sedimentation of potassium chloride crystals. When transferring slurry from the aforementioned dissolving mixer 120 to the aforementioned slurry dewatering machine 130, a roller vacuum type self-priming hose pump is used to pump it out. The aforementioned environmentally friendly recycling method for cement chlorine bypass dust can prevent scaling in the pipeline by using the aforementioned roller vacuum type self-priming hose pump to pump it out and perform the dissolving or dewatering process as a partial repeating process or a continuous cycle process.

[0181] This invention provides an environmentally friendly method for recycling cement chlorine bypass dust, a byproduct of cement production, to prevent scaling in pipelines and to treat the dissolution or dehydration process as a partially repeated or continuously cyclical process. The method exhibits significant process stability and is economical.

[0182] Furthermore, the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust may also include: step S140, transferring the dewatered filtrate separated in the above-mentioned slurry dewatering machine 130 to one or more potassium chloride dryers 170 and drying it to recover potassium chloride; or step S150, transferring the sediment in the above-mentioned potassium chloride sedimentation tank 160 to one or more potassium chloride dryers 170 and drying it to recover potassium chloride.

[0183] Furthermore, the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust may also include: step S160, transferring the above-mentioned sludge cake to the sludge cake storage yard 140 to prepare sludge for use as raw material for the firing kiln; or step S170, transferring the above-mentioned sludge cake to the sludge cake dryer 150 to prepare dried sludge for use as cement auxiliary material.

[0184] Furthermore, the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust may also include: step S180, placing the supernatant from the potassium chloride sedimentation tank 160 or the condensate from the potassium chloride dryer 170 together with water or an acidic aqueous solution into the dissolving mixer 120; or step S190, after placing the condensate from the potassium chloride dryer 170 or the condensate from the sludge cake dryer 150 into the sludge cake storage area 140, adding at least one of water, an acidic aqueous solution, the condensate from the sludge cake dryer 150, and the condensate from the potassium chloride dryer 170 into the sludge cake in the sludge cake storage area 140 to prepare a recycled slurry, and then transferring the recycled slurry into the dissolving mixer 120.

[0185] Figure 2 This is a process flow diagram of an environmentally friendly recycling method for cement chlorine bypass dust according to an embodiment of the present invention.

[0186] Reference Figure 2 After cement chlorine bypass dust is added to one or more dissolving mixers 120, the cement chlorine bypass dust is dissolved in at least one of water, acidic aqueous solution, supernatant from the sedimentation tank of potassium chloride sedimentation tank 160 and condensate from potassium chloride dryer 170 to form a slurry (step S110).

[0187] Then, the slurry dissolved in the above-mentioned dissolving mixer 120 is transferred to the slurry dewatering machine 130 to separate into sludge cake and dewatered filtrate (step S120).

[0188] Subsequently, the dehydrated filtrate is transferred to one or more potassium chloride precipitation tanks 160 to recover potassium chloride through the precipitation and sedimentation of potassium chloride crystals (step S130).

[0189] Alternatively, the above-mentioned dehydrated filtrate may be transferred to one or more potassium chloride dryers 170 and dried to recover potassium chloride (step S140).

[0190] Alternatively, the sediment precipitated in the potassium chloride precipitation tank 160 can be transferred to one or more potassium chloride dryers 170 and dried to recover potassium chloride (step S150).

[0191] Furthermore, the sludge cake is transferred to the sludge cake storage yard 140 to prepare sludge for use as raw material for the firing kiln (step S160).

[0192] The sludge cake is then transferred to a sludge cake dryer 150 to prepare dried sludge for use as a cement auxiliary material with reduced chlorine concentration as a cement raw material (step S170).

[0193] Furthermore, the supernatant from the potassium chloride sedimentation tank 160 or the condensate from the potassium chloride dryer 170 is placed together with water or an acidic aqueous solution into the dissolving mixer 120 (step S180).

[0194] Finally, after adding the condensate from the potassium chloride dryer 170 or the condensate from the sludge cake dryer 150 to the sludge cake storage area 140, at least one selected from water, an acidic aqueous solution, the condensate from the sludge cake dryer 150, and the condensate from the potassium chloride dryer 170 is added to the sludge cake in the sludge cake storage area 140 to prepare a regenerated slurry, and then the regenerated slurry is transferred to the dissolving mixer 120 (step S190).

[0195] Among them, the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust can prevent scaling inside the pipeline and treat the dissolution or dehydration process as a partially repeated process and a continuous cycle process.

[0196] Among them, the above-mentioned repeated processes can be 1 to 6 times.

[0197] In this case, the recycling efficiency of the cement chlorine bypass dust can be increased with the increase of the number of repetitions of the above-mentioned repetitive processes.

[0198] Moreover, the aforementioned continuous cycle process can be a process that continuously cycles the dissolving, dehydrating, or drying processes more than once.

[0199] In this case, when the slurry is transferred from the dissolving mixer 120 to the slurry dewatering machine 130, it can be pumped out by a roller vacuum type self-priming hose pump, and the slurry can be pumped out from the top of the dissolving mixer 120.

[0200] Furthermore, in addition to a large amount of alkali and chlorine, the aforementioned chlorine bypass dust also contains a considerable amount of calcium and sulfate ions. When it comes into contact with water or acidic aqueous solution and is transported by conveyor belt or pumped through pipeline, it not only produces potassium chloride, but also calcium carbonate and gypsum, thus inevitably causing scaling in the conveyor belt or pipeline.

[0201] Among them, the above-mentioned roller vacuum type self-priming hose pump can use the expansion and contraction of the high-pressure vacuum tube and the compression roller that can move in both the forward and reverse directions to allow slurry and regenerated slurry to enter from the suction port and be discharged through the discharge port.

[0202] Therefore, the aforementioned roller vacuum type self-priming hose pump fundamentally prevents the partial carrying and blockage of solid components during the transfer process caused by scale formed in the conveyor belt or pipeline, thus enabling the repetition of some or all processes and continuous operation of all processes for a specified time or more.

[0203] Furthermore, the aforementioned sludge cake dryer 150 may include a vertical cylindrical continuous dryer.

[0204] The entire surface of the vertical cylindrical continuous dryer used for drying sludge cake can be a drying profile. The sludge cake, when fed into the vertical cylindrical continuous dryer, is dried while being attached to the entire surface of the dryer in the form of a thin film under the action of centrifugal force. Sludge can be dried into a thin film in this way.

[0205] Among them, the thermal efficiency of the vertical cylindrical continuous dryer for drying sludge cake is more than twice that of the existing rotary dryer or spray dryer. The evaporated steam is fully recovered as condensate to replace the mixed water, so no wastewater is generated, thereby significantly improving the economic efficiency of the process operation.

[0206] Furthermore, the potassium chloride dryer 170 described above may include a vertical cylindrical continuous dryer.

[0207] The entire surface of the vertical cylindrical continuous dryer for potassium chloride drying can be a drying profile. The sludge cake fed into the vertical cylindrical continuous dryer is dried in the form of a thin film attached to the entire surface of the vertical cylindrical continuous dryer under the action of centrifugal force. Sludge can be dried into a thin film in this way.

[0208] Among them, the thermal efficiency of the vertical cylindrical continuous dryer for potassium chloride drying is more than twice that of the existing rotary dryer or spray dryer. The evaporated steam is fully recovered as condensate to replace the mixed water, so no wastewater is generated, thereby significantly improving the economic efficiency of the process operation.

[0209] Furthermore, the above-mentioned one or more dissolving mixers 120 are underground with their upper ends horizontal to the ground. The slurry is pumped out from the upper part of the above-mentioned one or more dissolving mixers 120, and the condensate from the potassium chloride dryer 170 is further added to the above-mentioned one or more dissolving mixers 120. The cement chlorine bypass dust can be dissolved in the condensate from the potassium chloride dryer 170.

[0210] Furthermore, when transferring the slurry from the aforementioned dissolving mixer 120 to the aforementioned slurry dewatering machine 130, the aforementioned roller vacuum type self-priming hose pump can be used to pump it out, and the slurry can be pumped out from the top of the aforementioned dissolving mixer 120 to the conveyor line.

[0211] Furthermore, the aforementioned sludge cake storage area 140 can be moved underground to the lower side of the aforementioned slurry dewatering machine 130 so that the dewatered sludge cake can fall, be stored, or transferred to the storage area at the lower side of the dewatering machine.

[0212] Furthermore, the aforementioned sludge cake storage area 140 is configured to add at least one of the following: water, acidic aqueous solution, condensate from the aforementioned sludge cake dryer 150, and condensate from the aforementioned potassium chloride dryer 170. The sludge cake can be mixed with at least one of the following to prepare a slurry, which is then pumped to the aforementioned dissolving mixer 120 via the aforementioned roller vacuum type self-priming hose pump.

[0213] The dissolving agitator used to dissolve chlorine bypass dust in water or acidic aqueous solution can be underground with its upper end level with the ground. This is to allow the sludge cake storage area generated in the slurry dewatering machine to be underground to the lower side of the slurry dewatering machine, and then the sludge cake is mixed with water or acidic aqueous solution to slurry it. This minimizes the height difference between the lower part of the sludge cake storage area and the upper part of the dissolving agitator when it is transferred to the next dissolving agitator, thereby increasing the ease of transfer and improving the operating rate.

[0214] Furthermore, the conveyor line used for transferring the slurry after mixing in a dissolving mixer to dissolve chlorine bypass dust in water or an acidic aqueous solution is configured to pump the slurry out from the top of the dissolving mixer. This is to prevent pipe blockages that often occur when the slurry concentration is too high at the bottom of the mixer when the slurry is pumped out from the bottom.

[0215] Furthermore, the environmentally friendly recycling method for the aforementioned cement chlorine bypass dust includes: as a first dissolution, dissolving the cement chlorine bypass dust in a No. 1 dissolving mixer 120 in at least one of water, an acidic aqueous solution, the supernatant from the settling tank of the aforementioned potassium chloride settling tank 160, and the condensate from the aforementioned potassium chloride dryer 170 to prepare a slurry; as a first dewatering, dewatering the slurry in the aforementioned slurry dewatering machine 130 to prepare a first sludge cake, allowing the first sludge cake to fall into the aforementioned sludge cake storage area, and then mixing the first sludge cake with at least one of water, an acidic aqueous solution, the condensate from the aforementioned sludge cake dryer 150, and the condensate from the aforementioned potassium chloride dryer 170 to prepare a first regenerated slurry; and pumping the first regenerated slurry to a No. 2 dissolving mixer 120 using a roller vacuum type self-priming hose pump; as a second... The process of secondary dissolution involves dissolving the first regenerated slurry transferred to the No. 2 dissolution mixer 120 in at least one of water, an acidic aqueous solution, the supernatant from the settling tank of the potassium chloride settling tank 160, and the condensate from the potassium chloride dryer 170 to prepare a slurry; and the process of secondary dewatering involves dewatering the slurry in the slurry dewatering machine 130 to prepare a second sludge cake, allowing the second sludge cake to fall into the sludge cake storage area 140, and then mixing the second sludge cake with at least one of water, an acidic aqueous solution, the condensate from the sludge cake dryer 150, and the condensate from the potassium chloride dryer 170 to prepare a second regenerated slurry. This process prevents scaling in the pipelines of the environmentally friendly recycling system for cement chlorine bypass dust and performs the dissolution or dewatering process as a partially repeated process and a continuous cycle process.

[0216] Among them, the above-mentioned continuous cycle process or partially repeated process can be 1 to 6 times.

[0217] In this case, the recycling efficiency of the cement chlorine bypass dust can be increased with the increase of the number of repetitions of the above-mentioned repetitive processes.

[0218] Furthermore, the dissolution-dehydration-drying process can be carried out by dissolving the cement chlorine bypass dust in at least one of the following: water, the supernatant of a potassium chloride sedimentation tank selected from an acidic aqueous solution, and the condensate of a potassium chloride dryer, after the cement chlorine bypass dust is placed into the dissolution mixer to form a slurry.

[0219] Afterwards, a slurry dewatering machine can be used to dewater the slurry dissolved in the above-mentioned dissolving mixer to separate it into sludge cake and dewatered filtrate.

[0220] In this case, when transferring slurry from the aforementioned dissolving mixer to the aforementioned slurry dewatering machine, a roller vacuum type self-priming hose pump can be used to pump it out, and the slurry can be pumped out from the top of the aforementioned dissolving mixer to the conveyor line.

[0221] Then, the sludge cake can be transferred to a sludge cake storage facility to prepare sludge for the firing kiln.

[0222] Furthermore, the aforementioned sludge cake can be transferred to a sludge cake dryer to prepare dried sludge for use as a cement auxiliary material with reduced chlorine concentration, which can be used as a cement raw material.

[0223] Then, the above dehydrated filtrate can be transferred to a potassium chloride precipitation tank to allow potassium chloride to precipitate and settle, thereby recovering potassium chloride.

[0224] Furthermore, the dehydrated filtrate can be transferred to a potassium chloride dryer and dried to recover potassium chloride.

[0225] Furthermore, the sediment precipitated in the potassium chloride sedimentation tank can be transferred to a potassium chloride dryer and dried to recover potassium chloride.

[0226] Under these conditions, the conveyor lines will hardly get clogged and will hardly produce any wastewater.

[0227] Furthermore, in the secondary repeated process of dissolution-dehydration, as the first dissolution, cement chlorine bypass dust can be put into No. 1 dissolution mixer, and the cement chlorine bypass dust can be dissolved in at least one of water, acidic aqueous solution, supernatant from a potassium chloride sedimentation tank, and condensate from a potassium chloride dryer to form a slurry.

[0228] Subsequently, as the first dewatering step, a slurry dewatering machine can be used to dewater the slurry dissolved in the No. 1 dissolving mixer to separate it into the first sludge cake and the first dewatered filtrate.

[0229] In this case, when transferring slurry from the No. 1 dissolving mixer to the slurry dewatering machine, a roller vacuum type self-priming hose pump can be used to pump it out, and the slurry can be pumped out from the top of the No. 1 dissolving mixer to the conveyor line.

[0230] Then, after the first sludge cake is dropped into the sludge cake storage area, the first sludge cake can be mixed with at least one selected from water, acidic aqueous solution, condensate from the sludge cake dryer, and condensate from the potassium chloride dryer to prepare a first regenerated slurry.

[0231] In this case, the first regenerated slurry can be pumped to the No. 2 dissolving mixer using a roller vacuum self-priming hose pump.

[0232] Then, as a second dissolution, the first regenerated slurry transferred to the above-mentioned No. 2 dissolution mixer can be dissolved in at least one of water, acidic aqueous solution, supernatant from the above-mentioned potassium chloride precipitation tank, and condensate from the above-mentioned potassium chloride dryer to prepare a slurry.

[0233] Subsequently, as a second dewatering process, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 2 dissolving mixer to separate it into a second sludge cake and a second dewatered filtrate.

[0234] Then, after the second sludge cake is dropped into the sludge cake storage area, sludge for the firing kiln can be prepared.

[0235] Furthermore, the aforementioned second sludge cake can be transferred to a sludge cake dryer to prepare dried sludge for use as a cement auxiliary material with reduced chlorine concentration as a cement raw material.

[0236] In this case, the first dehydrated filtrate and the second dehydrated filtrate can be transferred to a potassium chloride precipitation tank to allow potassium chloride to precipitate and settle, thereby recovering potassium chloride.

[0237] Furthermore, the first and second dehydrated filtrates can be transferred to a potassium chloride dryer and dried to recover potassium chloride.

[0238] Furthermore, the sediment precipitated in the potassium chloride sedimentation tank can be transferred to a potassium chloride dryer and dried to recover potassium chloride.

[0239] Under these conditions, the conveyor lines will hardly get clogged and will hardly produce any wastewater.

[0240] Furthermore, in the three-part repetitive dissolution-dehydration process, as the first dissolution, cement chlorine bypass dust can be placed into dissolution mixer No. 1, and the cement chlorine bypass dust can be dissolved in at least one of water, acidic aqueous solution, supernatant from the potassium chloride sedimentation tank, and condensate from the potassium chloride dryer to form a slurry.

[0241] Subsequently, as the first dewatering step, a slurry dewatering machine can be used to dewater the slurry dissolved in the No. 1 dissolving mixer to separate it into the first sludge cake and the first dewatered filtrate.

[0242] In this case, when transferring slurry from the No. 1 dissolving mixer to the slurry dewatering machine, a roller vacuum type self-priming hose pump can be used to pump it out, and the slurry can be pumped out from the top of the No. 1 dissolving mixer to the conveyor line.

[0243] Then, after the first sludge cake is dropped into the sludge cake storage area, the first sludge cake can be mixed with at least one selected from water, acidic aqueous solution, condensate from the sludge cake dryer, and condensate from the potassium chloride dryer to prepare a first regenerated slurry.

[0244] In this case, the first regenerated slurry can be pumped to the No. 2 dissolving mixer using a roller vacuum self-priming hose pump.

[0245] Then, as a second dissolution, the first regenerated slurry transferred to the above-mentioned No. 2 dissolution mixer can be dissolved in at least one of water, acidic aqueous solution, supernatant from the above-mentioned potassium chloride precipitation tank, and condensate from the above-mentioned potassium chloride dryer to prepare a slurry.

[0246] Subsequently, as a second dewatering process, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 2 dissolving mixer to separate it into a second sludge cake and a second dewatered filtrate.

[0247] Then, after the second sludge cake is dropped into the sludge cake storage area, the second sludge cake is mixed with at least one selected from water, acidic aqueous solution, condensate from the sludge cake dryer, and condensate from the potassium chloride dryer to prepare a second regenerated slurry.

[0248] In this case, the aforementioned second regenerated slurry can be pumped to the No. 3 dissolving mixer using a roller vacuum self-priming hose pump.

[0249] Subsequently, as a third dissolution, the second regenerated slurry transferred to the aforementioned No. 3 dissolution mixer is dissolved in at least one of water, an acidic aqueous solution, the supernatant from the aforementioned potassium chloride precipitation tank, and the condensate from the aforementioned potassium chloride dryer to prepare a slurry.

[0250] Then, as a third dewatering step, a slurry dewatering machine can be used to dewater the slurry dissolved in the No. 3 dissolving mixer to separate it into a third sludge cake and a third dewatered filtrate.

[0251] Afterwards, sludge for the firing kiln can be prepared after the third sludge cake is dropped into the sludge cake storage area.

[0252] Furthermore, the aforementioned third sludge cake can be transferred to a sludge cake dryer to prepare dried sludge for use as a cement auxiliary material with reduced chlorine concentration as a cement raw material.

[0253] In this case, the first dehydrated filtrate, the second dehydrated filtrate, and the third dehydrated filtrate can be transferred to a potassium chloride precipitation tank to allow potassium chloride to precipitate and settle, thereby recovering potassium chloride.

[0254] Furthermore, the first dehydrated filtrate, the second dehydrated filtrate, and the third dehydrated filtrate can be transferred to a potassium chloride dryer and dried to recover potassium chloride.

[0255] Furthermore, the sediment precipitated in the potassium chloride sedimentation tank can be transferred to a potassium chloride dryer and dried to recover potassium chloride.

[0256] Under these conditions, the conveyor lines will hardly get clogged and will hardly produce any wastewater.

[0257] Moreover, in the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust, when the dissolution or dehydration process is carried out as a partially repeated process or a continuous cycle process, the dissolution time can be shortened as the number of repeated dissolution or dehydration processes increases.

[0258] Furthermore, the potassium chloride precipitation tank 160 can be equipped with a heating device that is either constantly heating or on-demand heating via heat pipes or steam pipes at the bottom and sides.

[0259] Furthermore, a coagulant can be added to the potassium chloride precipitation tank 160. The coagulant may contain at least one inorganic electrolyte selected from quicklime (calcium hydroxide), alum, aluminum chloride, ferric oxide and ferrous sulfate, or may contain starch or polyacrylamide and its derivatives as organic polymer compounds.

[0260] Furthermore, in order to shorten the precipitation time of potassium chloride crystals in the potassium chloride precipitation tank 160, the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust involves using a roller vacuum type self-priming hose pump or submersible pump to pump the supernatant of the potassium chloride precipitation tank 160 as the dissolving mixed water for dissolving in the dissolving mixer 120, while potassium chloride crystals are precipitating and settling from the dehydrated filtrate transferred to the potassium chloride precipitation tank 160.

[0261] In the repeated process of dissolving chlorine bypass dust in water or acidic aqueous solution → separating and dewatering water or aqueous solution with sludge, the subsequent conveying line of the dewatered filtrate generated in the slurry dewatering machine can be divided into two lines, a potassium chloride sedimentation tank and a potassium chloride dryer, regardless of the number of dewatering cycles, so that they can be transferred separately or simultaneously.

[0262] Furthermore, during the repeated process of dissolving chlorine bypass dust in water or an acidic aqueous solution → separating and dewatering the water or aqueous solution with the sludge, the dewatered filtrate produced in the slurry dewatering machine can be transferred to the potassium chloride sedimentation tank. This is to minimize the operating procedures of the potassium chloride dryer or to maximize the economic benefits of improving drying efficiency.

[0263] Furthermore, to facilitate water evaporation, the bottom and sides of the potassium chloride sedimentation tank can be equipped with heating devices such as heat pipes or steam pipes, which can be used continuously or at any time. This is to adjust the crystal precipitation time of potassium chloride by whether the heating device is operating or not, based on the change in the time required for the supersaturation of potassium chloride to evaporate through the dehydrated filtrate.

[0264] Furthermore, to further shorten the precipitation time of potassium chloride crystals, the aforementioned coagulant can be added to the dehydrated filtrate transferred to the potassium chloride precipitation tank, and the amount added can be adjusted. This is to promote sedimentation by accelerating the settling speed of the potassium chloride particles precipitated in the liquid.

[0265] Furthermore, in order to further shorten the precipitation time of potassium chloride crystals, the supernatant can be removed by using a roller vacuum self-priming hose pump at the point when potassium chloride crystals precipitate and settle in the dehydrated filtrate transferred to the potassium chloride precipitation tank and supernatant is generated, or it can be transferred to a dissolving mixer for use as a dissolving mixed water.

[0266] Furthermore, in order to fundamentally eliminate the generation of wastewater, the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust can transfer the condensate from the above-mentioned sludge cake dryer 150 or the above-mentioned potassium chloride dryer 170 to be used as the mixed water for dissolving in the above-mentioned dissolving mixer 120 and the mixed water for preparing the regenerated slurry of sludge cake in the sludge cake storage yard 140.

[0267] Furthermore, the above-mentioned environmentally friendly recycling method for cement chlorine bypass dust can be used to prepare dried sludge for high-value-added cement auxiliary materials by transferring the sludge cake generated in the slurry dewatering machine during the repeated separation and dewatering process of water or aqueous solution with sludge to the underground storage yard under the side of the slurry dewatering machine, and then to the sludge cake dryer to reduce the moisture content to below 5%.

[0268] In the repeated process of separating and dewatering water or aqueous solution from sludge, the sludge cake generated in the slurry dewatering machine is transferred to the underground storage yard below the side of the slurry dewatering machine. The subsequent conveyor line consists of two lines: the sludge cake dryer and the product sludge storage yard, which can be transferred separately or simultaneously.

[0269] Potassium chloride recovered through an environmentally friendly recycling system for cement chlorine bypass dust.

[0270] This invention provides potassium chloride recovered through the above-mentioned environmentally friendly recycling system for cement chlorine bypass dust.

[0271] This invention provides an environmentally friendly recycling system for potassium chloride recovered through the above-mentioned cement chlorine bypass dust, which is economical.

[0272] Sludge with reduced chlorine concentration prepared through an environmentally friendly recycling system for cement chlorine bypass dust.

[0273] This invention provides sludge with reduced chlorine concentration prepared by the above-mentioned environmentally friendly recycling system for cement chlorine bypass dust.

[0274] This invention provides sludge with reduced chlorine concentration prepared by the above-mentioned environmentally friendly recycling system for cement chlorine bypass dust, which is economical.

[0275] Potassium chloride recovered through an environmentally friendly recycling method using cement chlorine bypass dust.

[0276] This invention provides potassium chloride recovered through the above-described environmentally friendly recycling method for cement chlorine bypass dust.

[0277] This invention provides an environmentally friendly method for recovering potassium chloride using the above-mentioned cement chlorine bypass dust, which is economical.

[0278] Sludge with reduced chlorine concentration prepared by an environmentally friendly method of recycling cement chlorine bypass dust.

[0279] This invention provides sludge with reduced chlorine concentration prepared by the above-described environmentally friendly recycling method for cement chlorine bypass dust.

[0280] This invention provides an environmentally friendly method for recycling cement chlorine bypass dust, resulting in sludge with reduced chlorine concentration, which is economical.

[0281] The present invention will now be described in more detail through embodiments. However, the following embodiments are only used to illustrate the present invention more specifically, and the scope of the present invention is not limited to the following embodiments. The following embodiments can be appropriately modified and varied by those skilled in the art within the scope of the present invention.

[0282] Example

[0283] Example 1. An environmentally friendly recycling method using a 2-hour dissolution-dehydration-precipitation single-step process of an environmentally friendly recycling system for cement chlorine bypass dust with a chlorine content of 189,000 ppm.

[0284] Cement chlorine bypass dust with a chlorine content of 189,000 ppm was placed in a dissolving mixer and dissolved in water, acidic aqueous solution, and the supernatant of a potassium chloride sedimentation tank for 2 hours to form a slurry.

[0285] Then, a slurry dewatering machine is used to dewater the slurry dissolved in the above-mentioned dissolving mixer to separate it into sludge cake and dewatered filtrate.

[0286] In this case, when transferring slurry from the aforementioned dissolving mixer to the aforementioned slurry dewatering machine, a roller vacuum type self-priming hose pump is used to pump the slurry out from the top of the aforementioned dissolving mixer to the conveyor line.

[0287] Then, the above dehydrated filtrate is transferred to a potassium chloride precipitation tank containing quicklime (calcium hydroxide) as a coagulant to recover potassium chloride through the precipitation and sedimentation of potassium chloride crystals.

[0288] The recovery rate of potassium chloride recovered through the above-mentioned environmentally friendly recycling method of dissolving-dehydrating-precipitating in one step for 2 hours is 75.5%.

[0289] Furthermore, the conveyor line experiences almost no blockages and produces virtually no wastewater.

[0290] Example 2. An environmentally friendly recycling method using a 2-hour dissolution-dehydration-precipitation-drying single-step process of an environmentally friendly recycling system for cement chlorine bypass dust with a chlorine content of 189,000 ppm.

[0291] Cement chlorine bypass dust with a chlorine content of 189,000 ppm was placed in a dissolving mixer and dissolved in water, acidic aqueous solution, supernatant from a potassium chloride settling tank, and condensate from a potassium chloride dryer for 2 hours to form a slurry.

[0292] Then, a slurry dewatering machine is used to dewater the slurry dissolved in the above-mentioned dissolving mixer to separate it into sludge cake and dewatered filtrate.

[0293] In this case, when transferring slurry from the aforementioned dissolving mixer to the aforementioned slurry dewatering machine, a roller vacuum type self-priming hose pump is used to pump the slurry out from the top of the aforementioned dissolving mixer to the conveyor line.

[0294] Then, the sludge cake is transferred to a sludge cake storage facility to prepare sludge for the firing kiln.

[0295] The sludge cake is then transferred to a sludge cake dryer to prepare dried sludge for use as a cement auxiliary material with reduced chlorine concentration, which can be used as a cement raw material.

[0296] Then, the above dehydrated filtrate is transferred to a potassium chloride precipitation tank containing quicklime (calcium hydroxide) as a coagulant to recover potassium chloride through the precipitation and sedimentation of potassium chloride crystals.

[0297] Subsequently, the precipitate in the potassium chloride sedimentation tank is transferred to a potassium chloride dryer, which is a vertical cylindrical continuous dryer, and dried to recover potassium chloride.

[0298] The recovery rate of potassium chloride recovered through the above-mentioned environmentally friendly recycling method of dissolving, dehydrating, precipitating and drying in one step for 2 hours is 77.5%.

[0299] Furthermore, the conveyor line experiences almost no blockages and produces virtually no wastewater.

[0300] Example 3. An environmentally friendly recycling method using a 3-hour dissolution-dehydration-precipitation-drying single-step process of an environmentally friendly recycling system for cement chlorine bypass dust with a chlorine content of 189,000 ppm.

[0301] Cement chlorine bypass dust with a chlorine content of 189,000 ppm was placed in a dissolving mixer. The cement chlorine bypass dust was dissolved in water, acidic aqueous solution, supernatant from the sedimentation tank of a potassium chloride sedimentation tank, and condensate from a potassium chloride dryer for 3 hours to form a slurry. Otherwise, the same method as in Example 2 was performed.

[0302] The recovery rate of potassium chloride recovered through the above-mentioned environmentally friendly recycling method of dissolving, dehydrating, precipitating and drying in one step for 3 hours is 81.5%.

[0303] Furthermore, the conveyor line experiences almost no blockages and produces virtually no wastewater.

[0304] Example 4. An environmentally friendly recycling method using a 2-hour dissolution-dehydration-drying single-step process of an environmentally friendly recycling system for cement chlorine bypass dust with a chlorine content of 189,000 ppm.

[0305] Cement chlorine bypass dust with a chlorine content of 189,000 ppm was placed in a dissolving mixer and dissolved in water, acidic aqueous solution, supernatant from a potassium chloride settling tank, and condensate from a potassium chloride dryer for 2 hours to form a slurry.

[0306] Then, a slurry dewatering machine is used to dewater the slurry dissolved in the above-mentioned dissolving mixer to separate it into sludge cake and dewatered filtrate.

[0307] In this case, when transferring slurry from the aforementioned dissolving mixer to the aforementioned slurry dewatering machine, a roller vacuum type self-priming hose pump is used to pump the slurry out from the top of the aforementioned dissolving mixer to the conveyor line.

[0308] Then, the sludge cake is transferred to a sludge cake storage facility to prepare sludge for the firing kiln.

[0309] The sludge cake is then transferred to a sludge cake dryer to prepare dried sludge for use as a cement auxiliary material with reduced chlorine concentration, which can be used as a cement raw material.

[0310] Then, the above dehydrated filtrate is transferred to a potassium chloride dryer, which is a vertical cylindrical continuous dryer, and the potassium chloride is dried to recover potassium chloride.

[0311] The recovery rate of potassium chloride recovered through the above-mentioned environmentally friendly recycling method of dissolving-dehydrating-drying in one step for 2 hours is 75.5%.

[0312] Furthermore, the conveyor line experiences almost no blockages and produces virtually no wastewater.

[0313] Example 5. An environmentally friendly recycling method using a 2-hour dissolution-dehydration-precipitation-drying secondary dissolution-dehydration process with repeated steps in an environmentally friendly recycling system for cement chlorine bypass dust with a chlorine content of 189,000 ppm.

[0314] As the first dissolution, cement chlorine bypass dust with a chlorine content of 189,000 ppm was placed into the No. 1 dissolving mixer, and then dissolved in water, acidic aqueous solution and condensate from a potassium chloride dryer for 2 hours to form a slurry.

[0315] Subsequently, as the first dewatering step, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 1 dissolving mixer to separate it into a first sludge cake and a first dewatered filtrate.

[0316] In this case, when transferring slurry from the No. 1 dissolving mixer to the aforementioned slurry dewatering machine, a roller vacuum type self-priming hose pump is used to pump the slurry out from the top of the No. 1 dissolving mixer to the conveyor line.

[0317] Then, after the first sludge cake is dropped into the sludge cake storage area, the first sludge cake is mixed with water, an acidic aqueous solution, condensate from the sludge cake dryer, and condensate from the potassium chloride dryer to prepare the first regenerated slurry.

[0318] In this case, the first regenerated slurry is pumped to the No. 2 dissolving mixer using a roller vacuum self-priming hose pump.

[0319] Then, as a second dissolution, the first regenerated slurry transferred to the above-mentioned No. 2 dissolution mixer is dissolved in water, acidic aqueous solution, the supernatant of the above-mentioned potassium chloride precipitation tank, and the condensate of the above-mentioned potassium chloride dryer to prepare a slurry.

[0320] Subsequently, as a second dewatering process, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 2 dissolving mixer to separate it into a second sludge cake and a second dewatered filtrate.

[0321] Then, the second sludge cake is dropped into the sludge cake storage area to prepare sludge for the firing kiln.

[0322] Furthermore, the aforementioned second sludge cake is transferred to a sludge cake dryer to prepare dried sludge for use as a cement auxiliary material with reduced chlorine concentration, which can be used as a cement raw material.

[0323] In this case, the first dehydrated filtrate and the second dehydrated filtrate are transferred to a potassium chloride precipitation tank containing polyacrylamide as a coagulant to recover potassium chloride through the precipitation and sedimentation of potassium chloride crystals.

[0324] Furthermore, the precipitate in the potassium chloride sedimentation tank is transferred to a potassium chloride dryer, which is a vertical cylindrical continuous dryer, and dried to recover potassium chloride.

[0325] The recovery rate of potassium chloride recovered through the environmentally friendly recycling method of the above-mentioned 2-hour dissolution-dehydration-precipitation-drying secondary dissolution-dehydration part repeat process was 88.6%.

[0326] Furthermore, the conveyor line experiences almost no blockages and produces virtually no wastewater.

[0327] Example 6. An environmentally friendly recycling method using a 3-hour dissolution-dehydration-precipitation-drying secondary dissolution-dehydration process with repeated steps in an environmentally friendly recycling system for cement chlorine bypass dust with a chlorine content of 189,000 ppm.

[0328] Cement chlorine bypass dust with a chlorine content of 189,000 ppm was placed in a dissolving mixer. The cement chlorine bypass dust was dissolved in water, acidic aqueous solution, supernatant from the sedimentation tank of potassium chloride sedimentation tank, and condensate from the potassium chloride dryer for 3 hours to form a slurry. Otherwise, the same method as in Example 5 was performed.

[0329] The recovery rate of potassium chloride recovered through the above-mentioned environmentally friendly recycling method, which involves a secondary dissolution-dehydration-precipitation-drying process with repeated steps, is 96.5%.

[0330] Furthermore, the conveyor line experiences almost no blockages and produces virtually no wastewater.

[0331] Example 7. An environmentally friendly recycling method using a 2-hour dissolution-dehydration process with repeated steps in an environmentally friendly recycling system for cement chlorine bypass dust with a chlorine content of 189,000 ppm.

[0332] As the first dissolution, cement chlorine bypass dust with a chlorine content of 189,000 ppm was placed into the No. 1 dissolving mixer, and then dissolved in water, acidic aqueous solution and condensate from a potassium chloride dryer for 2 hours to form a slurry.

[0333] Subsequently, as the first dewatering step, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 1 dissolving mixer to separate it into a first sludge cake and a first dewatered filtrate.

[0334] In this case, when transferring slurry from the No. 1 dissolving mixer to the aforementioned slurry dewatering machine, a roller vacuum type self-priming hose pump is used to pump the slurry out from the top of the No. 1 dissolving mixer to the conveyor line.

[0335] Then, after the first sludge cake is dropped into the sludge cake storage area, the first sludge cake is mixed with water, an acidic aqueous solution, condensate from the sludge cake dryer, and condensate from the potassium chloride dryer to prepare the first regenerated slurry.

[0336] In this case, the first regenerated slurry is pumped to the No. 2 dissolving mixer using a roller vacuum self-priming hose pump.

[0337] Then, as a second dissolution, the first regenerated slurry transferred to the above-mentioned No. 2 dissolution mixer is dissolved in water, acidic aqueous solution, the supernatant of the above-mentioned potassium chloride precipitation tank, and the condensate of the above-mentioned potassium chloride dryer to prepare a slurry.

[0338] Subsequently, as a second dewatering process, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 2 dissolving mixer to separate it into a second sludge cake and a second dewatered filtrate.

[0339] Then, the second sludge cake is dropped into the sludge cake storage area to prepare sludge for the firing kiln.

[0340] Furthermore, the aforementioned second sludge cake is transferred to a sludge cake dryer to prepare dried sludge for use as a cement auxiliary material with reduced chlorine concentration, which can be used as a cement raw material.

[0341] In this case, the first dehydrated filtrate and the second dehydrated filtrate are transferred to a potassium chloride dryer, which is a vertical cylindrical continuous dryer, and the potassium chloride is dried to recover potassium chloride.

[0342] The recovery rate of potassium chloride recovered through the above-mentioned environmentally friendly recycling method of repeated dissolution-dehydration process of 2 hours is 85.6%.

[0343] Furthermore, the conveyor line experiences almost no blockages and produces virtually no wastewater.

[0344] Example 8. An environmentally friendly recycling method using a cement chlorine bypass dust with a chlorine content of 189,000 ppm, employing a three-stage repetitive dissolution-dehydration process involving 2 hours of dissolution-dehydration.

[0345] As the first dissolution, cement chlorine bypass dust with a chlorine content of 189,000 ppm is placed into the No. 1 dissolving mixer. The cement chlorine bypass dust is then dissolved in water, the supernatant of the sedimentation tank of the acidic aqueous solution potassium chloride sedimentation tank, and the condensate of the potassium chloride dryer for 2 hours to form a slurry.

[0346] Subsequently, as the first dewatering step, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 1 dissolving mixer to separate it into a first sludge cake and a first dewatered filtrate.

[0347] In this case, when transferring slurry from the No. 1 dissolving mixer to the aforementioned slurry dewatering machine, a roller vacuum type self-priming hose pump is used to pump the slurry out from the top of the No. 1 dissolving mixer to the conveyor line.

[0348] Then, after the first sludge cake is dropped into the sludge cake storage area, the first sludge cake is mixed with water, an acidic aqueous solution, condensate from the sludge cake dryer, and condensate from the potassium chloride dryer to prepare the first regenerated slurry.

[0349] In this case, the first regenerated slurry is pumped to the No. 2 dissolving mixer using a roller vacuum self-priming hose pump.

[0350] Then, as a second dissolution, the first regenerated slurry transferred to the above-mentioned No. 2 dissolution mixer is dissolved in water, acidic aqueous solution, the supernatant of the above-mentioned potassium chloride precipitation tank, and the condensate of the above-mentioned potassium chloride dryer to prepare a slurry.

[0351] Subsequently, as a second dewatering process, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 2 dissolving mixer to separate it into a second sludge cake and a second dewatered filtrate.

[0352] Then, after the second sludge cake is dropped into the sludge cake storage area, the second sludge cake is mixed with water, an acidic aqueous solution, condensate from the sludge cake dryer, and condensate from the potassium chloride dryer to prepare a second regenerated slurry.

[0353] In this case, the above-mentioned second regenerated slurry is pumped to the No. 3 dissolving mixer using a roller vacuum self-priming hose pump.

[0354] Subsequently, as a third dissolution, the second regenerated slurry transferred to the aforementioned No. 3 dissolution mixer is dissolved in water, an acidic aqueous solution, the supernatant from the aforementioned potassium chloride precipitation tank, and the condensate from the aforementioned potassium chloride dryer to prepare a slurry.

[0355] Then, as a third dewatering step, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 3 dissolving mixer to separate it into a third sludge cake and a third dewatered filtrate.

[0356] Afterwards, the aforementioned third sludge cake is dropped into the aforementioned sludge cake storage area to prepare sludge for the firing kiln.

[0357] Furthermore, the aforementioned third sludge cake is transferred to a sludge cake dryer to prepare dried sludge for use as a cement auxiliary material with reduced chlorine concentration, which can be used as a cement raw material.

[0358] In this case, the first dehydrated filtrate, the second dehydrated filtrate, and the third dehydrated filtrate are transferred to a potassium chloride precipitation tank containing aluminum chloride as a coagulant to recover potassium chloride through the precipitation and sedimentation of potassium chloride crystals.

[0359] Furthermore, the precipitate in the potassium chloride sedimentation tank is transferred to a potassium chloride dryer, which is a vertical cylindrical continuous dryer, and dried to recover potassium chloride.

[0360] The recovery rate of potassium chloride recovered through the environmentally friendly recycling method of three repeated dissolution-dehydration processes (dissolution-dehydration-precipitation-drying) was 97.6%.

[0361] Furthermore, the conveyor line experiences almost no blockages and produces virtually no wastewater.

[0362] Example 9. An environmentally friendly recycling method using a 3-hour dissolution-dehydration-precipitation-drying three-stage repetitive dissolution-dehydration process of cement chlorine bypass dust with a chlorine content of 189,000 ppm.

[0363] After placing cement chlorine bypass dust with a chlorine content of 189,000 ppm into a dissolving mixer, the cement chlorine bypass dust was dissolved in water, acidic aqueous solution, and condensate from a potassium chloride dryer for 3 hours to form a slurry. Otherwise, the same method as in Example 8 was performed.

[0364] The recovery rate of potassium chloride recovered through the environmentally friendly recycling method of the above-mentioned three-stage dissolution-dehydration process with a 3-hour dissolution-dehydration interval was 98.3%.

[0365] Furthermore, the conveyor line experiences almost no blockages and produces virtually no wastewater.

[0366] Example 10. An environmentally friendly recycling method using a cement chlorine bypass dust with a chlorine content of 189,000 ppm, involving a three-stage repetitive dissolution-dehydration process with a 2-hour dissolution-dehydration cycle.

[0367] As the first dissolution, cement chlorine bypass dust with a chlorine content of 189,000 ppm is placed into the No. 1 dissolving mixer. The cement chlorine bypass dust is then dissolved in water, acidic aqueous solution, supernatant from the sedimentation tank of potassium chloride sedimentation tank, and condensate from the potassium chloride dryer for 2 hours to form a slurry.

[0368] Subsequently, as the first dewatering step, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 1 dissolving mixer to separate it into a first sludge cake and a first dewatered filtrate.

[0369] In this case, when transferring slurry from the No. 1 dissolving mixer to the aforementioned slurry dewatering machine, a roller vacuum type self-priming hose pump is used to pump the slurry out from the top of the No. 1 dissolving mixer to the conveyor line.

[0370] Then, after the first sludge cake is dropped into the sludge cake storage area, the first sludge cake is mixed with water, an acidic aqueous solution, condensate from the sludge cake dryer, and condensate from the potassium chloride dryer to prepare the first regenerated slurry.

[0371] In this case, the first regenerated slurry is pumped to the No. 2 dissolving mixer using a roller vacuum self-priming hose pump.

[0372] Then, as a second dissolution, the first regenerated slurry transferred to the above-mentioned No. 2 dissolution mixer is dissolved in water, acidic aqueous solution, the supernatant of the above-mentioned potassium chloride precipitation tank, and the condensate of the above-mentioned potassium chloride dryer to prepare a slurry.

[0373] Subsequently, as a second dewatering process, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 2 dissolving mixer to separate it into a second sludge cake and a second dewatered filtrate.

[0374] Then, after the second sludge cake is dropped into the sludge cake storage area, the second sludge cake is mixed with water, an acidic aqueous solution, condensate from the sludge cake dryer, and condensate from the potassium chloride dryer to prepare a second regenerated slurry.

[0375] In this case, the above-mentioned second regenerated slurry is pumped to the No. 3 dissolving mixer using a roller vacuum self-priming hose pump.

[0376] Subsequently, as a third dissolution, the second regenerated slurry transferred to the aforementioned No. 3 dissolution mixer is dissolved in water, an acidic aqueous solution, the supernatant from the aforementioned potassium chloride precipitation tank, and the condensate from the aforementioned potassium chloride dryer to prepare a slurry.

[0377] Then, as a third dewatering step, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 3 dissolving mixer to separate it into a third sludge cake and a third dewatered filtrate.

[0378] Afterwards, the aforementioned third sludge cake is dropped into the aforementioned sludge cake storage area to prepare sludge for the firing kiln.

[0379] Furthermore, the aforementioned third sludge cake is transferred to a sludge cake dryer to prepare dried sludge for use as a cement auxiliary material with reduced chlorine concentration, which can be used as a cement raw material.

[0380] In this case, the first dehydrated filtrate, the second dehydrated filtrate, and the third dehydrated filtrate are transferred to a potassium chloride dryer, which is a vertical cylindrical continuous dryer, to dry potassium chloride and recover potassium chloride.

[0381] The recovery rate of potassium chloride recovered through the above-mentioned environmentally friendly recycling method of three repeated dissolution-dehydration processes (3 hours of dissolution-dehydration-drying) was 95.6%.

[0382] Furthermore, the conveyor line experiences almost no blockages and produces virtually no wastewater.

[0383] Example 11. An environmentally friendly recycling method using a 2-hour dissolution-dehydration-precipitation single-step process of an environmentally friendly recycling system for cement chlorine bypass dust with a chlorine content of 220,000 ppm.

[0384] Cement chlorine bypass dust with a chlorine content of 220,000 ppm was placed in a dissolving mixer and dissolved in water, acidic aqueous solution and the supernatant of the potassium chloride sedimentation tank for 2 hours to form a slurry.

[0385] Then, a slurry dewatering machine is used to dewater the slurry dissolved in the above-mentioned dissolving mixer to separate it into sludge cake and dewatered filtrate.

[0386] In this case, when transferring slurry from the aforementioned dissolving mixer to the aforementioned slurry dewatering machine, a roller vacuum type self-priming hose pump is used to pump the slurry out from the top of the aforementioned dissolving mixer to the conveyor line.

[0387] Then, the above dehydrated filtrate is transferred to a potassium chloride precipitation tank containing polyacrylamide as a coagulant to recover potassium chloride through the precipitation and sedimentation of potassium chloride crystals.

[0388] The chlorine content of the sludge used as raw material for the firing kiln prepared by the above-mentioned environmentally friendly recycling method of dissolving-dehydrating-precipitating in one step for 2 hours is 45,000 ppm.

[0389] Furthermore, the conveyor line experiences almost no blockages and produces virtually no wastewater.

[0390] Example 12. An environmentally friendly recycling method using a 2-hour dissolution-dehydration-precipitation-drying single-step process of an environmentally friendly recycling system for cement chlorine bypass dust with a chlorine content of 220,000 ppm.

[0391] Cement chlorine bypass dust with a chlorine content of 220,000 ppm was placed in a dissolving mixer and dissolved in water, acidic aqueous solution, and condensate from a potassium chloride dryer for 2 hours to form a slurry.

[0392] Then, a slurry dewatering machine is used to dewater the slurry dissolved in the above-mentioned dissolving mixer to separate it into sludge cake and dewatered filtrate.

[0393] In this case, when transferring slurry from the aforementioned dissolving mixer to the aforementioned slurry dewatering machine, a roller vacuum type self-priming hose pump is used to pump the slurry out from the top of the aforementioned dissolving mixer to the conveyor line.

[0394] Then, the sludge cake is transferred to a sludge cake storage facility to prepare sludge for the firing kiln.

[0395] The sludge cake is then transferred to a sludge cake dryer to prepare dried sludge for use as a cement auxiliary material with reduced chlorine concentration, which can be used as a cement raw material.

[0396] Then, the above dehydrated filtrate is transferred to a potassium chloride precipitation tank containing polyacrylamide as a coagulant to recover potassium chloride through the precipitation and sedimentation of potassium chloride crystals.

[0397] Subsequently, the precipitate in the potassium chloride sedimentation tank is transferred to a potassium chloride dryer, which is a vertical cylindrical continuous dryer, and dried to recover potassium chloride.

[0398] The chlorine content of the sludge used as raw material for the firing kiln prepared by the above-mentioned environmentally friendly recycling method of dissolving, dehydrating, settling and drying in one step for 2 hours is 43,000 ppm.

[0399] Furthermore, the conveyor line experiences almost no blockages and produces virtually no wastewater.

[0400] Example 13. An environmentally friendly recycling method using a 3-hour dissolution-dehydration-precipitation-drying single-step process of an environmentally friendly recycling system for cement chlorine bypass dust with a chlorine content of 220,000 ppm.

[0401] After the cement chlorine bypass dust with a chlorine content of 220,000 ppm is placed into the dissolving mixer, the cement chlorine bypass dust is dissolved in water, acidic aqueous solution, supernatant from the sedimentation tank of potassium chloride sedimentation tank and condensate from potassium chloride dryer for 3 hours to form a slurry. Otherwise, the same method as in Example 12 above is performed.

[0402] The chlorine content of the sludge used as raw material for firing kilns prepared by the above-mentioned environmentally friendly recycling method of dissolving, dehydrating, settling and drying in one step over 3 hours is 26,000 ppm.

[0403] Furthermore, the conveyor line experiences almost no blockages and produces virtually no wastewater.

[0404] Example 14. An environmentally friendly recycling method using a 2-hour dissolution-dehydration-precipitation-drying secondary dissolution-dehydration process with repeated steps in an environmentally friendly recycling system for cement chlorine bypass dust with a chlorine content of 220,000 ppm.

[0405] As the first dissolution, cement chlorine bypass dust with a chlorine content of 220,000 ppm was placed into dissolving mixer No. 1. The cement chlorine bypass dust was dissolved in water, the supernatant of the sedimentation tank of the acidic aqueous potassium chloride sedimentation tank, and the condensate of the potassium chloride dryer for 2 hours to form a slurry.

[0406] Subsequently, as the first dewatering step, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 1 dissolving mixer to separate it into a first sludge cake and a first dewatered filtrate.

[0407] In this case, when transferring slurry from the No. 1 dissolving mixer to the aforementioned slurry dewatering machine, a roller vacuum type self-priming hose pump is used to pump the slurry out from the top of the No. 1 dissolving mixer to the conveyor line.

[0408] Then, after the first sludge cake is dropped into the sludge cake storage area, the first sludge cake is mixed with water, an acidic aqueous solution, condensate from the sludge cake dryer, and condensate from the potassium chloride dryer to prepare the first regenerated slurry.

[0409] In this case, the first regenerated slurry is pumped to the No. 2 dissolving mixer using a roller vacuum self-priming hose pump.

[0410] Then, as a second dissolution, the first regenerated slurry transferred to the above-mentioned No. 2 dissolution mixer is dissolved in water, acidic aqueous solution, the supernatant of the above-mentioned potassium chloride precipitation tank, and the condensate of the above-mentioned potassium chloride dryer to prepare a slurry.

[0411] Subsequently, as a second dewatering process, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 2 dissolving mixer to separate it into a second sludge cake and a second dewatered filtrate.

[0412] Then, the second sludge cake is dropped into the sludge cake storage area to prepare sludge for the firing kiln.

[0413] Furthermore, the aforementioned second sludge cake is transferred to a sludge cake dryer to prepare dried sludge for use as a cement auxiliary material with reduced chlorine concentration, which can be used as a cement raw material.

[0414] In this case, the first dehydrated filtrate and the second dehydrated filtrate are transferred to a potassium chloride precipitation tank containing polyacrylamide as a coagulant to recover potassium chloride through the precipitation and sedimentation of potassium chloride crystals.

[0415] Furthermore, the precipitate in the potassium chloride sedimentation tank is transferred to a potassium chloride dryer, which is a vertical cylindrical continuous dryer, and dried to recover potassium chloride.

[0416] The chlorine content of the sludge used as raw material for the firing kiln prepared by the environmentally friendly recycling method of the above-mentioned 2-hour dissolution-dehydration-precipitation-drying secondary dissolution-dehydration part repeat process is 21,000 ppm.

[0417] Furthermore, the conveyor line experiences almost no blockages and produces virtually no wastewater.

[0418] Example 15. An environmentally friendly recycling method using a 3-hour dissolution-dehydration-precipitation-drying secondary dissolution-dehydration process with repeated steps in an environmentally friendly recycling system for cement chlorine bypass dust with a chlorine content of 220,000 ppm.

[0419] Cement chlorine bypass dust with a chlorine content of 220,000 ppm was placed in a dissolving mixer and dissolved in water, acidic aqueous solution and the supernatant of the potassium chloride sedimentation tank for 3 hours to form a slurry. Otherwise, the same method as in Example 14 was performed.

[0420] The chlorine content of the sludge used as raw material for firing kilns prepared by the environmentally friendly recycling method of repeating the secondary dissolution-dehydration process of 3 hours of dissolution-dehydration-precipitation-drying is 4200 ppm.

[0421] Furthermore, the conveyor line experiences almost no blockages and produces virtually no wastewater.

[0422] Example 16. An environmentally friendly recycling method using a 2-hour dissolution-dehydration-precipitation-drying three-stage repetitive dissolution-dehydration process of cement chlorine bypass dust with a chlorine content of 220,000 ppm.

[0423] As the first dissolution, cement chlorine bypass dust with a chlorine content of 220,000 ppm was placed into dissolving mixer No. 1. The cement chlorine bypass dust was dissolved in water, acidic aqueous solution, supernatant from the potassium chloride sedimentation tank, and condensate from the potassium chloride dryer for 2 hours to form a slurry.

[0424] Subsequently, as the first dewatering step, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 1 dissolving mixer to separate it into a first sludge cake and a first dewatered filtrate.

[0425] In this case, when transferring slurry from the No. 1 dissolving mixer to the aforementioned slurry dewatering machine, a roller vacuum type self-priming hose pump is used to pump the slurry out from the top of the No. 1 dissolving mixer to the conveyor line.

[0426] Then, after the first sludge cake is dropped into the sludge cake storage area, the first sludge cake is mixed with water, an acidic aqueous solution, condensate from the sludge cake dryer, and condensate from the potassium chloride dryer to prepare the first regenerated slurry.

[0427] In this case, the first regenerated slurry is pumped to the No. 2 dissolving mixer using a roller vacuum self-priming hose pump.

[0428] Then, as a second dissolution, the first regenerated slurry transferred to the above-mentioned No. 2 dissolution mixer is dissolved in water, acidic aqueous solution, the supernatant of the above-mentioned potassium chloride precipitation tank, and the condensate of the above-mentioned potassium chloride dryer to prepare a slurry.

[0429] Subsequently, as a second dewatering process, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 2 dissolving mixer to separate it into a second sludge cake and a second dewatered filtrate.

[0430] Then, after the second sludge cake is dropped into the sludge cake storage area, the second sludge cake is mixed with water, an acidic aqueous solution, condensate from the sludge cake dryer, and condensate from the potassium chloride dryer to prepare a second regenerated slurry.

[0431] In this case, the above-mentioned second regenerated slurry is pumped to the No. 3 dissolving mixer using a roller vacuum self-priming hose pump.

[0432] Subsequently, as a third dissolution, the second regenerated slurry transferred to the aforementioned No. 3 dissolution mixer is dissolved in water, an acidic aqueous solution, the supernatant from the aforementioned potassium chloride precipitation tank, and the condensate from the aforementioned potassium chloride dryer to prepare a slurry.

[0433] Then, as a third dewatering step, a slurry dewatering machine is used to dewater the slurry dissolved in the No. 3 dissolving mixer to separate it into a third sludge cake and a third dewatered filtrate.

[0434] Afterwards, the aforementioned third sludge cake is dropped into the aforementioned sludge cake storage area to prepare sludge for the firing kiln.

[0435] Furthermore, the aforementioned third sludge cake is transferred to a sludge cake dryer to prepare dried sludge for use as a cement auxiliary material with reduced chlorine concentration, which can be used as a cement raw material.

[0436] In this case, the first dehydrated filtrate, the second dehydrated filtrate, and the third dehydrated filtrate are transferred to a potassium chloride precipitation tank containing quicklime (calcium hydroxide) as a coagulant to recover potassium chloride through the precipitation and sedimentation of potassium chloride crystals.

[0437] Furthermore, the precipitate in the potassium chloride sedimentation tank is transferred to a potassium chloride dryer, which is a vertical cylindrical continuous dryer, and dried to recover potassium chloride.

[0438] The chlorine content of the sludge used as raw material for the firing kiln prepared by the environmentally friendly recycling method of three repeated dissolution-dehydration-precipitation-drying processes (2 hours) is 4400 ppm.

[0439] Furthermore, the conveyor line experiences almost no blockages and produces virtually no wastewater.

[0440] Example 17. An environmentally friendly recycling method using a 3-hour dissolution-dehydration-precipitation-drying three-stage repetitive dissolution-dehydration process of cement chlorine bypass dust with a chlorine content of 220,000 ppm.

[0441] Cement chlorine bypass dust with a chlorine content of 220,000 ppm was placed in a dissolving mixer. The cement chlorine bypass dust was dissolved in water, the supernatant of the sedimentation tank of an acidic aqueous potassium chloride sedimentation tank, and the condensate of a potassium chloride dryer for 3 hours to form a slurry. Otherwise, the same method as in Example 16 was performed.

[0442] The chlorine content of the sludge used as raw material for the firing kiln prepared by the environmentally friendly recycling method of three repeated dissolution-dehydration-precipitation-drying processes (3 hours) is 2200 ppm.

[0443] Furthermore, the conveyor line experiences almost no blockages and produces virtually no wastewater.

[0444] Comparative Example 1. Method for Recovering and Utilizing Chlorine Bypass Dust

[0445] To perform separation, dewatering, and drying processes on chlorine bypass dust in a dissolved liquid, slurry, or sludge state with a moisture content of approximately 60%, pumps are used for pressure conveying via pipelines. Furthermore, a rotary dryer is used in the drying process.

[0446] In this situation, blockages in the conveyor lines occur frequently, and wastewater is generated in units of tens of tons per day.

[0447] Comparative Example 2. Method for Recovering and Utilizing Chlorine Bypass Dust

[0448] To perform separation, dewatering, and drying processes on chlorine bypass dust in a dissolved liquid, slurry, or sludge state with a moisture content of approximately 60%, pumps are used for pressure conveying via pipelines. Furthermore, a spray dryer is used in the drying process.

[0449] In this situation, conveyor line overload frequently occurs, and wastewater is generated in units of tens of tons per day.

[0450] The above describes specific embodiments of the environmentally friendly recycling system and method for cement chlorine bypass dust of the present invention. However, it is obvious that various modifications and implementations are possible without departing from the scope of the present invention.

[0451] Therefore, the scope of the present invention should not be limited to the illustrative embodiments, but should be defined by the appended claims and their equivalents.

[0452] That is, the foregoing embodiments are merely illustrative in all respects and should not be construed as limiting the present invention. Rather than a detailed description, the scope of the present invention is shown by the appended claims, and the meaning, scope, and all modifications or variations derived therefrom of the claims should be interpreted as being included within the scope of the present invention.

Claims

1. An environmentally friendly recycling system for cement chlorine bypass dust, characterized in that, include: One or more dissolving mixers (120) are used to dissolve cement chlorine bypass dust in the supernatant of the potassium chloride settling tank (160) to form a slurry. The slurry dewatering machine (130) separates the slurry dissolved in the above-mentioned dissolving mixer into sludge cake and dewatered filtrate; and One or more potassium chloride precipitation tanks (160) are used to transfer the above-mentioned dehydrated filtrate, and potassium chloride is recovered through the precipitation and sedimentation of potassium chloride crystals. When transferring slurry from the aforementioned dissolving mixer (120) to the aforementioned slurry dewatering machine (130), a roller vacuum type self-priming hose pump is used to pump it out. The above-mentioned environmental protection recycling system for cement chlorine bypass dust uses the above-mentioned roller vacuum self-priming hose pump to pump out the dust to prevent scaling in the pipeline and performs the dissolution or dehydration process as a partial repeat process or a continuous cycle process. In order to shorten the precipitation time of potassium chloride crystals in the potassium chloride precipitation tank (160), while potassium chloride crystals are precipitated and settled from the dehydrated filtrate transferred to the potassium chloride precipitation tank (160), at the time when the supernatant of the precipitation tank is generated, the supernatant of the potassium chloride precipitation tank (160) is pumped by a roller vacuum type self-priming hose pump or a submersible pump to be used as the dissolving mixed water for the dissolving mixer (120). In the repeated process of separating and dewatering water or aqueous solution from sludge, the sludge cake produced in the slurry dewatering machine is transferred to the underground storage yard below the side of the slurry dewatering machine, and then transferred to the sludge cake dryer to reduce the moisture content to below 5% to prepare dried sludge for high value-added cement auxiliary materials.

2. The environmentally friendly recycling system for cement chlorine bypass dust according to claim 1, characterized in that, The aforementioned environmentally friendly recycling system for cement chlorine bypass dust also includes: The sludge cake storage site (140) is where the aforementioned sludge cake is transferred; One or more sludge cake dryers (150) are used to dry sludge cakes in the aforementioned sludge cake storage area to form sludge with reduced chlorine concentration for use as cement raw material; and One or more potassium chloride dryers (170) are used to recover potassium chloride by drying the above-mentioned dehydrated filtrate; or by transferring and drying the sediment precipitated in the above-mentioned potassium chloride sedimentation tank (160).

3. The environmentally friendly recycling system for cement chlorine bypass dust according to claim 2, characterized in that, The aforementioned sludge cake storage area (140) is underground to the lower side of the aforementioned slurry dewatering machine (130), so that the dewatered sludge cake falls, is stored, or is transferred to the storage area at the lower side of the dewatering machine.

4. The environmentally friendly recycling system for cement chlorine bypass dust according to claim 2, characterized in that, The aforementioned sludge cake storage area (140) is configured to receive at least one of the following: water, acidic aqueous solution, condensate from the aforementioned sludge cake dryer (150), and condensate from the aforementioned potassium chloride dryer (170). The sludge cake is mixed with at least one of water, acidic aqueous solution, condensate from the sludge cake dryer (150) and condensate from the potassium chloride dryer (170) to prepare a slurry, which is then pumped to the dissolving mixer (120) by the roller vacuum self-priming hose pump.

5. The environmentally friendly recycling system for cement chlorine bypass dust according to claim 2, characterized in that, The above-mentioned one or more dissolving mixers (120) of the above-mentioned environmental protection recycling system for cement chlorine bypass dust are underground in such a way that the upper end of the above-mentioned dissolving mixers (120) is horizontal with the ground. The slurry is pumped out from the top of one or more of the aforementioned dissolving mixers (120). Further, the condensate from the potassium chloride dryer (170) is added to one or more of the above-mentioned dissolving mixers (120), and the above-mentioned cement chlorine bypass dust is dissolved in the condensate from the potassium chloride dryer (170).

6. The environmentally friendly recycling system for cement chlorine bypass dust according to claim 5, characterized in that, The aforementioned environmentally friendly recycling system for cement chlorine bypass dust includes: As the first dissolution, the process of dissolving the above-mentioned cement chlorine bypass dust in the supernatant of the above-mentioned potassium chloride precipitation tank (160) in the No. 1 dissolution mixer (120) to prepare slurry; As the first dewatering, after the slurry is dewatered by the slurry dewatering machine (130) to prepare the first sludge cake, the first sludge cake is dropped into the sludge cake storage yard, and the first sludge cake is mixed with at least one selected from water, acidic aqueous solution, condensate from the sludge cake dryer (150) and condensate from the potassium chloride dryer (170) to prepare the first regenerated slurry. The process of pumping the above-mentioned first regenerated slurry to the No. 2 dissolving mixer (120) by means of a roller vacuum self-priming hose pump; As a second dissolution, the process of dissolving the first regenerated slurry transferred to the above-mentioned No. 2 dissolution mixer (120) in at least one of water, an acidic aqueous solution, the supernatant from the above-mentioned potassium chloride settling tank (160), and the condensate from the above-mentioned potassium chloride dryer (170) to prepare the slurry; and As a second dewatering process, after the slurry is dewatered by the aforementioned slurry dewatering machine (130) to prepare a second sludge cake, the second sludge cake is allowed to fall into the aforementioned sludge cake storage yard (140), and then the second sludge cake is mixed with at least one selected from water, acidic aqueous solution, condensate from the aforementioned sludge cake dryer (150), and condensate from the aforementioned potassium chloride dryer (170) to prepare a second regenerated slurry. This prevents scaling inside the pipes of the environmentally friendly recycling system for cement chlorine bypass dust and allows the dissolution or dehydration process to be performed as a partially repeated process or a continuous cycle process.

7. The environmentally friendly recycling system for cement chlorine bypass dust according to claim 1, characterized in that, When the above-mentioned environmental protection recycling system for cement chlorine bypass dust treats the dissolution or dehydration process as a partially repeated process or a continuous cycle process, the dissolution time decreases as the number of repeated dissolution or dehydration processes increases.

8. The environmentally friendly recycling system for cement chlorine bypass dust according to claim 1, characterized in that, The potassium chloride precipitation tank (160) is equipped with a heating device that is either constantly heating or steaming, with heat pipes or steam pipes installed at the bottom and sides.

9. The environmentally friendly recycling system for cement chlorine bypass dust according to claim 1, characterized in that, A coagulant can be added to the potassium chloride precipitation tank (160) mentioned above. The aforementioned coagulant contains at least one inorganic electrolyte selected from calcium hydroxide, alum, aluminum chloride, ferric oxide, and ferrous sulfate, or contains starch or polyacrylamide and its derivatives as organic polymers.

10. The environmentally friendly recycling system for cement chlorine bypass dust according to claim 2, characterized in that, In order to fundamentally eliminate the generation of wastewater, the above-mentioned environmental protection recycling system for cement chlorine bypass dust transfers the condensate from the above-mentioned sludge cake dryer (150) or the above-mentioned potassium chloride dryer (170) to be used as the mixed water for dissolving in the above-mentioned dissolving mixer (120) and the mixed water for preparing the recycled sludge slurry of the sludge cake in the sludge cake storage yard (140).

11. The environmentally friendly recycling system for cement chlorine bypass dust according to claim 2, characterized in that, The above-mentioned environmental protection recycling system for cement chlorine bypass dust, after the sludge cake generated in the slurry dewatering machine during the repeated process of separating and dewatering water or aqueous solution from sludge is transferred to the underground storage yard at the lower side of the slurry dewatering machine, the subsequent conveyor line is composed of two lines: a sludge cake dryer (150) and a product sludge storage yard (180), which can be transferred individually or simultaneously.

12. An environmentally friendly method for recycling cement chlorine bypass dust, characterized in that, include: Step S110: After adding cement chlorine bypass dust to one or more dissolving mixers (120), the cement chlorine bypass dust is dissolved in the supernatant of the potassium chloride settling tank (160) to form a slurry. Step S120 involves transferring the slurry dissolved in the dissolving mixer (120) to a slurry dewatering machine (130) to separate it into sludge cake and dewatered filtrate; and In step S130, the dehydrated filtrate is transferred to one or more of the aforementioned potassium chloride precipitation tanks (160) to recover potassium chloride through the precipitation and sedimentation of potassium chloride crystals. When transferring slurry from the aforementioned dissolving mixer (120) to the aforementioned slurry dewatering machine (130), a roller vacuum type self-priming hose pump is used to pump it out. The above-mentioned environmentally friendly recycling method for cement chlorine bypass dust uses the above-mentioned roller vacuum self-priming hose pump to pump it out to prevent scaling in the pipeline and performs the dissolution or dehydration process as a partial repeat process or a continuous cycle process. The method further includes: Step S180: The supernatant from the potassium chloride sedimentation tank (160) or the condensate from the potassium chloride dryer (170) is placed together with water or an acidic aqueous solution into the dissolving mixer (120); or In step S190, after adding the condensate from the potassium chloride dryer (170) or the condensate from the sludge cake dryer (150) to the sludge cake storage area (140), at least one of water, acidic aqueous solution, condensate from the sludge cake dryer (150) and condensate from the potassium chloride dryer (170) is added to the sludge cake in the sludge cake storage area (140) to prepare a regenerated slurry, and then the regenerated slurry is transferred to the dissolving mixer (120).

13. The environmentally friendly recycling method for cement chlorine bypass dust according to claim 12, characterized in that, Also includes: Step S140: The dewatered filtrate separated in the above-mentioned slurry dewatering machine (130) is transferred to one or more potassium chloride dryers (170) and dried to recover potassium chloride; or In step S150, the sediment precipitated in the potassium chloride sedimentation tank (160) is transferred to one or more potassium chloride dryers (170) and dried to recover potassium chloride.

14. The environmentally friendly recycling method for cement chlorine bypass dust according to claim 12, characterized in that, Also includes: Step S160: The above sludge cake is transferred to the sludge cake storage yard (140) to prepare sludge for use as raw material for the firing kiln; or Step S170: The above sludge cake is transferred to a sludge cake dryer (150) to prepare dried sludge for cement auxiliary materials.

15. The environmentally friendly recycling method for cement chlorine bypass dust according to claim 12, characterized in that, A coagulant can be added to the potassium chloride precipitation tank (160) mentioned above. The aforementioned coagulant contains at least one inorganic electrolyte selected from calcium hydroxide, alum, aluminum chloride, ferric oxide, and ferrous sulfate, or contains starch or polyacrylamide and its derivatives as organic polymers.

16. The environmentally friendly recycling method for cement chlorine bypass dust according to claim 12, characterized in that, The aforementioned one or more dissolving mixers (120) are underground in such a way that the upper part of the dissolving mixers (120) is horizontal to the ground. The slurry is pumped out from the top of one or more of the aforementioned dissolving mixers (120). Further, the condensate from the potassium chloride dryer (170) is added to one or more of the above-mentioned dissolving mixers (120), and the above-mentioned cement chlorine bypass dust is dissolved in the condensate from the potassium chloride dryer (170).

17. A potassium chloride, characterized in that, The cement chlorine bypass dust is recycled using the environmentally friendly recycling system described in claim 1.

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