Steelmaking sludge sedimentation tank treatment device and treatment method

Abstract

The invention discloses a steelmaking sludge settling pond treatment device and method. The device comprises a sludge pond, a clear water supply system, a gas stirring system, an impeller stirring system and a filtering and intercepting system. The clear water supply system dilutes sludge concentration to avoid pipeline blockage; a gas and impeller stirring system improves the activity of the sludge and reduces deposition. The filtering and intercepting system intercepts large-particle sludge, and pipeline abrasion is reduced. The method can stabilize sintering moisture adjustment, prolong pool cleaning period, reduce dredging labor intensity and risk, guarantee operation safety, improve sintering water carbon quality and blast furnace ironmaking grade, and optimize steelmaking sludge treatment effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steelmaking, and particularly relates to a steelmaking sludge sedimentation tank treatment device and treatment method. BACKGROUND

[0002] In the process of steelmaking, a large amount of smoke dust is generated in the steelmaking link. After wet dust removal and dust removal sewage separation treatment, the steelmaking sludge is formed. The steelmaking sludge has high utilization value, high iron grade and low impurity content, is a valuable secondary resource, and mainly includes metallic iron, active lime and various organic matters generated in the waste steel melting process. However, it also has the characteristics of fine particle size and viscosity, which brings certain challenges to its efficient utilization.

[0003] At present, the utilization level of steelmaking sludge in steel enterprises is relatively low. The most important utilization way is to add it as iron concentrate powder sintering ingredients to the sintering process to produce sintered ore as ironmaking raw materials. This way has the advantages of simple process, less investment and almost no need to add more processing equipment. However, this way of directly using steelmaking sludge for sintering ingredients has obvious shortcomings. On the one hand, the physical and chemical properties of the raw materials fluctuate greatly, which increases the difficulty of sintering ingredients, and when water is added to the mixture, the phenomenon of pipe blockage frequently occurs, and the deposition of sludge iron scraps in the sludge pool is also very frequent, which seriously affects the smooth operation of sintering production, and also prolongs the cleaning period of the sludge pool, increasing the labor load of the workers. On the other hand, these problems also cause the abnormal control of sintering moisture adjustment, and the operation fluctuation is large. SUMMARY

[0004] The present application provides a steelmaking sludge sedimentation tank treatment device and treatment method to solve the problem of pipe blockage and frequent deposition of sludge iron scraps in the sludge pool in the existing way of directly using steelmaking sludge for sintering ingredients.

[0005] The present application provides a steelmaking sludge sedimentation tank treatment device, which comprises:

[0006] A sludge pool for storing steelmaking sludge;

[0007] A clean water supply system comprising a clean water pipeline for conveying clean water, the clean water pipeline being in communication with the sludge pool, and the clean water pipeline being used to supplement clean water into the sludge pool to dilute the concentration of steelmaking sludge;

[0008] A gas stirring system comprising a gas supply pipeline arranged around the sludge pool, the gas supply pipeline being used to introduce gas into the sludge pool and make the gas uniformly dispersed to improve the activity of the steelmaking sludge in the pool;

[0009] Impeller stirring system, including stirring pump and impeller group arranged on the stirring pump, the impeller group is used for scraping stirring sludge on the bottom of the sludge pool;

[0010] Filtering and intercepting system, including mesh filter component arranged at the outlet pipeline of the sludge pool, and filter water pocket arranged outside the mesh filter component, the mesh filter component is used for intercepting larger particle sludge, the filter water pocket is used for collecting the intercepted large sludge, and the filter water pocket is provided with lifting structure facilitating removal and cleaning.

[0011] In an embodiment of the present application, the gas supply pipeline includes a ring-shaped galvanized aeration pipe and a ventilation pipe, the ring-shaped galvanized aeration pipe surrounds the sludge pool, a plurality of aeration holes are uniformly arranged on the ring-shaped galvanized aeration pipe in the circumferential direction, the ventilation pipe is arranged close to the top of the sludge pool, and the ventilation pipe is connected with the ring-shaped galvanized aeration pipe at the bottom of the sludge pool to form a tee joint for gas supply and reserve a switch gate valve.

[0012] In an embodiment of the present application, the impeller group is a zinc-plated corrosion-resistant inclined-blade scraper, and the bolt connecting the impeller is made of high-strength wear-resistant material.

[0013] In an embodiment of the present application, the mesh filter component is detachably connected with the outlet pipeline of the sludge pool.

[0014] In an embodiment of the present application, the ring-shaped galvanized aeration pipe and the ventilation pipe are sealingly connected through a tee joint.

[0015] A steelmaking sludge sedimentation tank treatment method applied to the steelmaking sludge sedimentation tank treatment device described above, characterized in that it comprises:

[0016] The gas stirring system and the impeller stirring system are stopped, and a work card for maintenance and prohibition of closing is hung, and the on-duty room is registered for power-off equipment;

[0017] The cleaning personnel handle the operation approval form, perform safety and technical briefings, and check the completeness of the emergency equipment and facilities on site;

[0018] The cleaning personnel first use a water pump to pump the sludge on the surface of the sedimentation tank to a water collection pit, when the sludge pump cannot normally pump, clean water is supplied through the clean water supply system until the sludge on the surface of the sludge sedimentation tank is in a thin paste state, and the hard sediment is exposed;

[0019] The cleaning personnel remove the sediment sludge in the sedimentation tank, and the removal position is close to the position of the main sludge outlet pipeline by 1 m in height;

[0020] The gas stirring system is used to introduce gas into the sedimentation tank, so that the activity of the steelmaking sludge in the sedimentation tank is improved;

[0021] The impeller stirring system is started to stir the sludge in the sedimentation tank;

[0022] The discharged sludge is filtered and intercepted by the filtering and intercepting system, and large blocky and large particle sludge is intercepted in the small square water filtering pockets.

[0023] In an embodiment of the present application, in the process of increasing the activity of the steelmaking sludge in the sedimentation tank by introducing gas into the sedimentation tank through the gas stirring system, the process further comprises:

[0024] The gas flow introduced into the sedimentation tank is adjusted by controlling the on-off gate valve.

[0025] In an embodiment of the present application, in the process of filtering and intercepting the discharged sludge by the filtering and intercepting system, and intercepting large blocky and large particle sludge in the small square water filtering pockets, the process further comprises:

[0026] The small square water filtering pockets are periodically taken out by the lifting structure to clean the intercepted large blocky and large particle sludge.

[0027] In an embodiment of the present application, in the process of first pumping the surface sludge of the sedimentation tank to the water collecting pit by the water pump, and when the sludge water pump cannot normally pump, the process further comprises:

[0028] In the process of water replenishment and dilution, the concentration of the sludge is monitored in real time until the preset concentration of the sludge is reached.

[0029] In an embodiment of the present application, in the process of starting the impeller stirring system to stir the sludge in the sedimentation tank, the process further comprises:

[0030] The stirring pump rotation speed of the impeller stirring system is adjusted according to the concentration of the sludge.

[0031] The beneficial effects of the present application: the steelmaking sludge settling tank treatment device and treatment method provided by the present application can supplement clean water to the sludge tank in time through the clean water supply system, effectively dilute the concentration of steelmaking sludge, avoid the problem of pipe blockage caused by too high sludge concentration, and cooperate with the gas stirring system and the impeller stirring system to greatly improve the activity of the steelmaking sludge in the tank, reduce the deposition of sludge iron scraps in the tank, solve the problems of frequent pipe blockage when adding water to the mixed material and frequent deposition of sludge iron scraps in the sludge tank, make the sintering water content adjustment control more stable, and reduce the operation fluctuation. In the aspect of dredging operation, due to the reduction of sludge deposition, the tank cleaning period can be extended, the labor intensity and frequency of tank cleaning are reduced, the risk of dredging operation is reduced, safety accidents such as personnel collapse and drowning caused by deep sludge settling tank depth, wide area and unstable operation surface are avoided, and the safety of the operating personnel is ensured. The filter interception system can effectively intercept large block and large particle sludge through the mesh filter part and the filter water pocket, reduce the internal wear of the pipeline, avoid the steel slag hardening and material accumulation, improve the sintering water carbon quality, and ensure the quality of blast furnace ironmaking. BRIEF DESCRIPTION OF DRAWINGS

[0032] The drawings incorporated into the specification and forming a part thereof show, by way of illustration, embodiments in which the application can be practiced and are used to explain principles of the application. It is evident that other embodiments can be derived from the drawings without paying creative labor, which will be apparent to those skilled in the art.

[0033] In the drawings:

[0034] Figure 1 The flow chart of the steelmaking sludge settling tank treatment method provided in an embodiment of the present application;

[0035] Figure 2 The structural schematic diagram of the steelmaking sludge settling tank treatment device provided in an embodiment of the present application.

[0036] The reference signs are as follows:

[0037] Sludge tank 1, gas stirring system 2, air pipe 201, ring galvanized aeration pipe 202, aeration hole 202a, on-off gate valve 203, impeller stirring system 3. DETAILED DESCRIPTION

[0038] Following, the embodiments of the present application will be described in details by specific examples, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present application. The present application can also be implemented or applied by other different embodiments, and the details in the present application can be modified or changed based on different views and applications without departing from the spirit of the present application, and the following examples and the features in the examples can be combined with each other without conflict.

[0039] It should be noted that the diagrams provided in the following examples only schematically illustrate the basic concept of the present application, and the components in the diagrams only show the components related to the present application without showing the number, shape and size of the components in actual implementation, and the type, number and proportion of the components in actual implementation can be arbitrarily changed, and the layout type of the components can be more complex.

[0040] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present application, however, it is obvious for those skilled in the art that the embodiments of the present application can be implemented without these specific details, and in other embodiments, the well-known structures and devices are shown in the form of block diagrams instead of details to avoid making the embodiments of the present application difficult to understand.

[0041] Please refer to Figure 1 , the present application provides a steelmaking sludge settling tank treatment device.

[0042] In an exemplary embodiment of the present application, the steelmaking sludge settling tank treatment device comprises:

[0043] a sludge tank 1 for storing steelmaking sludge;

[0044] a clean water supply system comprising a clean water pipeline for conveying clean water, the clean water pipeline being in communication with the sludge tank 1, and the clean water pipeline being used to supplement clean water into the sludge tank 1 to dilute the concentration of the steelmaking sludge;

[0045] a gas stirring system 2 comprising a gas supply pipeline arranged around the sludge tank 1, the gas supply pipeline being used to introduce gas into the sludge tank 1 and uniformly disperse the gas to improve the activity of the steelmaking sludge in the tank;

[0046] an impeller stirring system 3 comprising a stirring pump and an impeller set arranged on the stirring pump, the impeller set being used to scrape and stir the sludge at the bottom of the sludge tank 1;

[0047] a filtering and intercepting system comprising a mesh filtering component arranged at the outlet pipeline of the sludge tank 1, and a filter water pocket arranged outside the mesh filtering component, the mesh filtering component being used to intercept larger particle sludge, the filter water pocket being used to collect the intercepted large sludge, and the filter water pocket being provided with a lifting structure for facilitating removal and cleaning.

[0048] In the present embodiment, the clean water supply system can supply clean water to the sludge pool 1 in time, effectively dilute the concentration of steelmaking sludge, avoid the problem of pipe blockage caused by too high sludge concentration, and cooperate with the gas stirring system 2 and the impeller stirring system 3 to greatly improve the activity of the steelmaking sludge in the pool, reduce the deposition of sludge and iron scraps in the pool, solve the problems of frequent pipe blockage when adding water to the mixture and frequent deposition of sludge and iron scraps in the sludge pool 1, make the sintering water content control more stable, and reduce the operation fluctuation. In the aspect of dredging operation, due to the reduction of sludge deposition, the pool cleaning period can be extended, the labor intensity and frequency of pool cleaning are reduced, the risk of dredging operation is reduced, the safety accidents such as personnel collapse and drowning caused by deep sludge deposition pool, wide area and unstable operation surface are avoided, and the safety of the operation personnel is ensured. The filtering and intercepting system can effectively intercept large blocky and large particle sludge through the mesh filtering part and the filter water pocket, reduce the internal wear of the pipeline, avoid the hardening and accumulation of steel slag, and improve the quality of sintering water and carbon, thereby ensuring the quality of blast furnace ironmaking.

[0049] In an example embodiment of the present application, the gas supply pipeline includes an annular galvanized aeration pipe 202 and an air pipe 201. The annular galvanized aeration pipe 202 surrounds the sludge pool 1, and a plurality of aeration holes 202a are uniformly arranged along the circumference of the annular galvanized aeration pipe 202. The air pipe 201 is laid near the top of the sludge pool 1, and the air pipe 201 is connected with the annular galvanized aeration pipe 202 at the bottom of the sludge pool 1 to form a three-way gas supply structure and reserve a switch gate valve 203.

[0050] In the present embodiment, the annular galvanized aeration pipe 202 surrounds the body of the sedimentation tank, and the plurality of aeration holes 202a uniformly arranged along the circumference of the annular galvanized aeration pipe 202 provide dispersed outlets for the gas entering the body of the sedimentation tank. The air pipe 201 is laid near the top of the body of the sedimentation tank, one end of the air pipe 201 is connected with an external gas source, and the other end of the air pipe 201 is connected with the annular galvanized aeration pipe 202 through a three-way joint to form a three-way gas supply structure, so that the gas delivered by the external gas source can be stably introduced into the annular galvanized aeration pipe 202. The switch gate valve 203 is arranged on the air pipe 201, and the gas flow entering the annular galvanized aeration pipe 202 can be controlled by adjusting the opening degree of the switch gate valve 203. When the gas enters the annular galvanized aeration pipe 202 through the air pipe 201, the gas will flow along the annular pipe and be dispersedly discharged through the aeration holes 202a uniformly arranged along the circumference, so that the gas enters the steelmaking sludge in the body of the sedimentation tank in the form of bubbles. These uniformly dispersed bubbles will drive the surrounding sludge to flow during the rising process, forming a stirring effect, thereby improving the activity of the steelmaking sludge in the pool, reducing sludge deposition, and promoting the uniform mixing of sludge and water, thereby providing stable raw materials for subsequent sintering and other links. The sealing three-way joint ensures that the gas will not leak during the conveying process, thereby ensuring the gas supply efficiency and stability.

[0051] In an exemplary embodiment of the present application, the impeller set is a zinc-plated anti-corrosion bevel-blade scraper, and the bolts connecting the impeller are made of high-strength wear-resistant material.

[0052] In the present embodiment, the impeller set is a zinc-plated anti-corrosion bevel-blade scraper. When rotating under the drive of the agitator pump, the bevel-blade structure can form a bevel scraping force on the sludge at the bottom of the sedimentation tank body, which can more efficiently strip the deposited sludge attached to the bottom of the tank. At the same time, the water flow generated by rotation can fully mix the scraped sludge with the liquid to prevent the sludge from rapidly depositing again. The zinc-plated material endows the impeller set with good corrosion resistance, which can resist the corrosion of corrosive components contained in the steelmaking sludge, prolong the service life of the impeller set, and reduce the performance degradation caused by corrosion. The bolts connecting the impeller are made of high-strength wear-resistant material, which can withstand large torque and stress under the working conditions of high-speed rotation of the impeller set and friction and impact with the sludge, thereby avoiding breakage of the bolts due to wear, corrosion or insufficient strength, ensuring the stable connection between the impeller set and the agitator pump, preventing the impeller from falling off, ensuring the continuous and stable operation of the mixing work, and thus maintaining the uniformity of the sludge concentration to provide stable conditions for the subsequent processing steps.

[0053] In an exemplary embodiment of the present application, the mesh filter component is detachably connected to the outlet pipe of the sludge tank 1.

[0054] In the present embodiment, when the steelmaking sludge is discharged from the sedimentation tank body through the outlet pipe, the mesh filter component intercepts the flowing sludge by virtue of its mesh structure, blocks the larger particles of sludge at the filter component, and prevents the large particles from entering the subsequent pipe to cause blockage, thereby ensuring the smoothness of sludge transportation. Since the mesh filter component will have a large amount of intercepted particle sludge attached to its surface during long-term use, affecting the filtering effect and sludge flow rate, the detachable connection of the mesh filter component allows the staff to conveniently detach the mesh filter component from the outlet pipe, clean or replace it, and then reinstall it back into the outlet pipe after cleaning, ensuring the continuous and effective filtering and intercepting function.

[0055] In an exemplary embodiment of the present application, the ring-shaped zinc-plated aeration pipe 202 is sealingly connected to the air pipe 201 through a tee joint.

[0056] In the embodiment, the tee joint is connected to the annular galvanized aeration pipe 202 and the ventilation pipe 201 as a connecting node, and forms a tight sealing connection, which can prevent gas leakage during transmission and ensure the efficiency of gas delivery; the ventilation pipe 201 is responsible for introducing gas from an external gas source, and the tee joint is used to divide the gas into the annular galvanized aeration pipe 202; since the annular galvanized aeration pipe 202 surrounds the body of the sedimentation tank and is uniformly provided with a plurality of aeration holes 202a along the circumference, when the gas enters the annular galvanized aeration pipe 202 through the tee joint, the gas is uniformly distributed along the annular pipe, and then enters the steelmaking sludge in the sedimentation tank through the aeration holes 202a. The sealing connection of the tee joint ensures that the gas can be stably and efficiently transmitted from the ventilation pipe 201 to the annular galvanized aeration pipe 202, and then uniformly dispersed in the sedimentation tank, thereby effectively improving the activity of the steelmaking sludge in the tank.

[0057] Please refer to Figure 2 The application further provides a steelmaking sludge sedimentation tank treatment method.

[0058] In an exemplary embodiment of the present application, the steelmaking sludge sedimentation tank treatment method comprises at least steps S110 to S170.

[0059] In step S110, the gas stirring system 2 and the impeller stirring system 3 are stopped, and a work card with a person on maintenance and a prohibition of closing is hung, and the on-duty room is ready for registration of power-off equipment.

[0060] For example, before the cleaning and other maintenance operations of the steelmaking sludge sedimentation tank are performed, the operation of the gas stirring system 2 and the impeller stirring system 3 needs to be stopped, so as to eliminate the risk of mechanical injury to the operators, such as rotation cutting of the impeller and gas impact. The work card with a person on maintenance and a prohibition of closing is hung, which transmits the information of “the equipment is under maintenance, and the operation is prohibited” to other personnel through the eye-catching sign, forms a physical warning barrier, prevents irrelevant personnel from misoperating the closing to start the equipment, and avoids accidental injury to the personnel working in the tank. The on-duty room is ready for registration of power-off equipment, which clearly records the equipment in the power-off state, the power-off time and the reason through written records, and realizes traceable management of the equipment state.

[0061] In step S120, the cleaning personnel handle the operation approval form, perform safety technical briefing, and check the completeness of the on-site emergency equipment and facilities.

[0062] For example, the approval form for the operation is used to review and confirm the necessity of the cleaning operation, the operation plan, safety measures, etc. through a standardized approval process; the safety technical briefing is used to clearly and accurately convey key information such as potential hazards during the operation, safety operation procedures, emergency response methods, etc. to the cleaning personnel; and the inspection of the emergency equipment and facilities is used to ensure that the emergency equipment can function properly in the event of a safety accident, thereby providing material support for timely rescue and minimizing the harm and losses caused by the accident. These three links cooperate with each other to form a complete safety management chain from operation permission, risk notification to emergency support, effectively reducing the safety accident rate of high-risk operations such as dredging, and protecting the life safety of the operating personnel.

[0063] In step S130, the cleaning personnel first uses a water pump to pump the sludge on the surface of the sedimentation tank to the water collection pit. When the sludge pump cannot be normally pumped, clean water is supplied through the clean water supply system to dilute until the sludge on the surface of the sludge sedimentation tank is in a thin paste state, and the hard sediment is exposed.

[0064] For example, at the initial stage of the cleaning operation, the sludge on the surface of the sedimentation tank usually has relatively good fluidity. At this time, the sludge is pumped to the water collection pit using a water pump, which can quickly reduce the amount of surface sludge in the tank, create initial operation space for subsequent deep cleaning, and avoid mixing of the surface sludge with the bottom hard sediment during the cleaning process, thereby increasing the cleaning difficulty. When the sludge concentration is too high or the viscosity is too large to cause the water pump to be unable to normally pump, clean water is supplied through the clean water supply system to dilute. The mixing of the clean water and the sludge reduces the sludge concentration and viscosity, and the originally difficult-to-flow sludge is changed to a thin paste state, thereby restoring the fluidity of the sludge, facilitating the continued operation of the water pump, and separating the surface thin paste sludge from the bottom hard sediment, thereby exposing the hard sediment and providing a clear target for subsequent targeted cleaning of the hard sediment, thereby improving the efficiency of the cleaning operation.

[0065] In step S140, the cleaning personnel removes the settled sludge in the sedimentation tank, and the removal position is 1 m high from the position of the main sludge outlet pipe.

[0066] For example, after the settled sludge in the sedimentation tank is removed, the accumulated sludge and other sediments in the tank are completely removed, thereby avoiding the above-mentioned problems of pipe blockage, rapid sludge deposition, etc. caused by the sediments, and reducing the sintering production fluctuations caused by sludge deposition from the root, thereby ensuring the smoothness of the subsequent steelmaking sludge treatment and sintering process. The removal position is controlled to be 1 m high from the position of the main sludge outlet pipe, which is to protect the main sludge outlet pipe. This height setting can avoid mechanical damage to the pipe during the cleaning process, and at the same time, a certain space is reserved as a buffer area to prevent disturbance during the removal operation from causing small sediments that have not been completely removed to directly enter the pipe and cause blockage.

[0067] In step S150, the gas is introduced into the sedimentation tank by the gas stirring system 2 to improve the activity of the steelmaking sludge in the sedimentation tank.

[0068] For example, the gas stirring system 2 introduces the gas into the sedimentation tank through the gas supply pipeline, and the gas enters the steelmaking sludge in the form of bubbles through the aeration holes 202a uniformly distributed on the annular galvanized aeration pipe 202. During the rising process of the bubbles, the bubbles will disturb the surrounding sludge, forming local convection and stirring effect, breaking the original relatively static state of the sludge, and promoting the full contact and mixing between the sludge particles and the liquid, thereby reducing the probability of sludge particles settling due to gravity. At the same time, the continuous generation, rising and rupture of the bubbles continuously transfer energy to the sludge system, which disperses the sludge particles that are prone to agglomeration and deposition due to their fine particle size and viscosity, thereby enhancing the flowability and suspensibility of the sludge, i.e., improving the activity of the steelmaking sludge. The sludge with improved activity can be more uniformly distributed in the sedimentation tank, thereby avoiding local deposition.

[0069] In step S160, the impeller stirring system 3 is started to stir the sludge in the sedimentation tank.

[0070] For example, the impeller stirring system 3 drives the impeller group to rotate, and the impeller group produces direct mechanical shearing and pushing effect on the sludge in the sedimentation tank during the rotation, breaks the agglomeration state between the sludge particles, and makes the sludge particles more uniformly dispersed in the liquid. At the same time, the rotation of the impeller will drive the surrounding sludge to form a circulating flow, which will roll up the sludge that may begin to deposit at the bottom of the sedimentation tank and mix with the upper layer of sludge, thereby avoiding the large-scale deposition of sludge at the bottom of the tank. Through the cooperation of the impeller stirring and the gas stirring system 2, the activity of the sludge is further improved.

[0071] In step S170, the discharged sludge is filtered and intercepted by the filtering and intercepting system, and the large blocky and large particle sludge is intercepted in the small square filter box.

[0072] For example, the filtering and intercepting system is composed of a mesh filter and a small square filter box, and when the sludge in the sedimentation tank is discharged through the outlet pipeline, it first passes through the mesh filter, which has a specific gap mesh structure and can preliminarily intercept the larger particles in the sludge, preventing the larger particles from entering the subsequent pipeline and avoiding the blockage of the pipeline by the particles, thereby affecting the conveying efficiency. For the large blocky sludge that cannot be completely intercepted by the mesh filter, the small square filter box arranged outside the mesh filter will perform secondary interception. The small square structure of the filter box can accommodate and collect these large blocky sludge, preventing it from flowing into the subsequent processing link with the sludge. At the same time, the lifting structure on the filter box facilitates the regular removal of the filter box by the staff to clean the intercepted large blocky and large particle sludge, thereby ensuring the continuous and effective operation of the filtering and intercepting system.

[0073] In an example embodiment of the present application, in the process of increasing the activity of the steelmaking sludge in the sedimentation tank by introducing gas into the tank through the gas stirring system 2, the gas flow introduced into the tank is adjusted by controlling the on-off gate valve 203.

[0074] In this embodiment, the on-off gate valve 203 is arranged on the gas supply pipe 201 of the gas stirring system 2, and the flow area of the gas is adjusted by changing the opening degree of the valve. When it is necessary to enhance the stirring effect, the opening degree of the on-off gate valve 203 is increased, so that more gas enters the sedimentation tank through the gas supply pipe, at this time, the number of gas bubbles increases, the upward disturbance is enhanced, and the activity of the steelmaking sludge can be effectively improved to avoid sludge deposition; when the activity of the sludge has met the requirements or the stirring intensity needs to be reduced, the valve opening degree is reduced to reduce the amount of gas introduced, so as to prevent energy waste or sludge splashing caused by excessive stirring.

[0075] In an example embodiment of the present application, in the process of filtering and intercepting the discharged sludge by the filtering and intercepting system, the large blocky and large particle sludge is intercepted in the small square filter water bag, further comprising: periodically taking out the small square filter water bag by the lifting structure to clean the intercepted large blocky and large particle sludge.

[0076] In this embodiment, the lifting structure on the filter water bag provides a convenient operation fulcrum for the staff. When the amount of large blocky and large particle sludge intercepted in the filter water bag reaches a certain amount, the staff can easily take out the filter water bag from the sedimentation tank outlet pipe through the lifting structure. Periodically taking out the filter water bag and cleaning the intercepted sludge can avoid the filter water bag losing the interception function due to blockage, and ensure that it always maintains a good filtering state.

[0077] In an example embodiment of the present application, in the process of first pumping the surface sludge of the sedimentation tank to the water collecting pit by the water pump, when the sludge water pump cannot normally pump, the clean water supply system is connected to supply clean water to dilute the surface sludge of the sludge sedimentation tank until the surface sludge is in a thin paste state and the hard sediment is exposed, further comprising: monitoring the concentration of the sludge in real time during the water supply and dilution process until the preset thin paste concentration is reached.

[0078] In this embodiment, when the clean water supply system is used to supply water to dilute the surface sludge of the sedimentation tank, real-time monitoring of the concentration of the sludge can timely grasp the change of the sludge state; because the steelmaking sludge has the characteristics of fine particle size and viscosity, too high concentration will lead to poor flowability and be difficult to be pumped by the water pump; too low concentration may affect the iron grade of the subsequent sintering batching. The preset thin paste concentration is the best concentration range determined according to the pumping requirements of the water pump and the subsequent processing process. By real-time monitoring, when it is found that the concentration of the sludge is higher than the preset value, clean water can be continuously supplied; when the concentration reaches the preset thin paste concentration, the water supply is stopped in time to avoid excessive dilution.

[0079] In an example embodiment of the present application, in the process of starting the impeller stirring system 3 to stir the sludge in the sedimentation tank, the stirring pump rotation speed of the impeller stirring system 3 is adjusted according to the concentration of the sludge.

[0080] In the present embodiment, the stirring pump rotation speed of the impeller stirring system 3 directly affects the stirring intensity of the sludge. When the concentration of the sludge in the sedimentation tank is high, the viscosity and fluidity of the sludge are poor. At this time, increasing the stirring pump rotation speed can enhance the shearing and pushing effect of the impeller group on the sludge, and more effectively break the agglomeration state of the sludge particles. When the concentration of the sludge is low, appropriately reducing the stirring pump rotation speed can not only maintain the uniform dispersion state of the sludge, but also reduce unnecessary energy consumption, while avoiding the problems of sludge splashing or excessive equipment wear caused by too high rotation speed.

[0081] The working principle is that the clean water supply system can supply clean water to the sludge tank 1 in time, effectively dilute the concentration of the steelmaking sludge, avoid the problem of pipe blockage caused by too high concentration of the sludge, and cooperate with the gas stirring system 2 and the impeller stirring system 3 to greatly improve the activity of the steelmaking sludge in the tank, reduce the deposition of the sludge and iron scraps in the tank, solve the problems of frequent pipe blockage when adding water to the mixed material and frequent deposition of sludge and iron scraps in the sludge tank 1, make the sintering water content control more stable, and reduce the operation fluctuation. In the aspect of dredging operation, due to the reduction of sludge deposition, the tank cleaning period can be extended, the labor intensity and frequency of tank cleaning are reduced, the risk of dredging operation is reduced, the safety accidents such as personnel collapse and drowning caused by deep sludge deposition tank, wide area and unstable operation surface are avoided, and the safety of the operation personnel is ensured. The filtering and intercepting system can effectively intercept large blocky and large particle sludge through the mesh filtering part and the filter water pocket, reduce the internal wear of the pipeline, avoid the hardening and accumulation of steel slag, improve the quality of sintering water and carbon, and ensure the quality of blast furnace ironmaking.

[0082] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A steelmaking sludge settling tank treatment device, characterized in that, The utility model relates to a steelmaking sludge treatment system, comprising: a sludge pool for storing steelmaking sludge; a clean water supply system comprising a clean water pipeline for conveying clean water, the clean water pipeline being in communication with the sludge pool, the clean water pipeline being used to supply clean water into the sludge pool to dilute the concentration of steelmaking sludge; a gas stirring system comprising a gas supply pipeline arranged around the sludge pool, the gas supply pipeline being used to introduce gas into the sludge pool and uniformly disperse the gas to improve the activity of steelmaking sludge in the pool; an impeller stirring system comprising an agitator pump and an impeller set arranged on the agitator pump, the impeller set being used to scrape and stir the sludge at the bottom of the sludge pool; a filtering and intercepting system comprising a mesh filter arranged at the outlet pipeline of the sludge pool and a filter pocket arranged outside the mesh filter, the mesh filter being used to intercept large-particle sludge, the filter pocket being used to collect the intercepted large sludge, and the filter pocket being provided with a lifting structure for facilitating removal and cleaning.

2. The steelmaking sludge settling pond treatment apparatus according to claim 1, characterized in that: The gas supply pipeline comprises a ring-shaped galvanized aeration pipe and an air pipe, the ring-shaped galvanized aeration pipe surrounds the sludge pool, a plurality of aeration holes are uniformly arranged on the ring-shaped galvanized aeration pipe in the circumferential direction, the air pipe is arranged close to the top of the sludge pool, and the air pipe is connected with the ring-shaped galvanized aeration pipe at the bottom of the sludge pool to form a tee joint for gas supply and reserve a switch gate valve.

3. The steelmaking sludge settling pond treatment apparatus according to claim 1, characterized in that: The impeller set is a galvanized anti-corrosion oblique-blade scraping piece, and the bolt connecting the impeller is made of high-strength wear-resistant material.

4. The steelmaking sludge settling pond treatment apparatus as claimed in claim 1, characterized in that: The mesh filter is detachably connected with the outlet pipeline of the sludge pool.

5. The steelmaking sludge settling pond treatment apparatus according to claim 2, characterized in that: The ring-shaped galvanized aeration pipe and the air pipe are sealingly connected through a tee joint.

6. A method for treating a steelmaking sludge settling tank, applied to the steelmaking sludge settling tank treatment device according to any one of claims 1 to 5, characterized in that, The method comprises the following steps: stopping the gas stirring system and the impeller stirring system, hanging a work card for man to overhaul and prohibiting closing, and registering off power equipment in the duty room; handling operation approval table by the pool cleaning personnel, performing safety technical disclosure, and checking the completeness of emergency equipment and facilities on site; the pool cleaning personnel first use a water pump to pump the sludge on the surface of the sedimentation tank to a water collecting pit, when the sludge pump cannot normally pump, clean water is supplied through the clean water supply system until the sludge on the surface of the sludge sedimentation tank is in a thin paste state and the hard sediment is exposed; the pool cleaning personnel remove the sludge in the sedimentation tank, and the removal position is close to the position of the sludge main outlet pipeline by 1 m in height; introducing gas into the sedimentation tank through the gas stirring system to improve the activity of the steelmaking sludge in the sedimentation tank; starting the impeller stirring system to stir the sludge in the sedimentation tank; filtering and intercepting the discharged sludge through the filtering and intercepting system to intercept large sludge and large-particle sludge in the small square filter pocket.

7. The method according to claim 6, characterized in that, In the step of introducing gas into the sedimentation tank through the gas stirring system to improve the activity of the steelmaking sludge in the sedimentation tank, the method further comprises the following steps: adjusting the flow of the gas introduced into the sedimentation tank by controlling the switch gate valve.

8. The method of treatment of a steelmaking sludge settling tank according to claim 6, characterized in that, In the step of filtering and intercepting the discharged sludge through the filtering and intercepting system to intercept large sludge and large-particle sludge in the small square filter pocket, the method further comprises the following step: periodically removing the small square filter pocket through the lifting structure to clean the intercepted large sludge and large-particle sludge.

9. The method of claim 6, wherein the method further comprises, Before the personnel of the pool first sedimentation tank surface sludge with water pump to the water collection pit, when the sludge pump can not be normal pumping, through the clean water supply system access clean water to dilute until the sludge sedimentation tank surface sludge is thin paste, expose the hard sediment material, also includes: In the process of water replenishment and dilution, the concentration of sludge is monitored in real time until the preset thin paste concentration is reached.

10. The method of claim 6, wherein the method further comprises, In the process of starting the impeller stirring system to stir the sludge in the sedimentation tank, also includes: The stirring pump speed of the impeller stirring system is adjusted according to the concentration of the sludge.

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