Recirculation of valuable substances from exhaust gas purification

Abstract

The present invention relates to a method and an apparatus for recycling valuables in the solid precipitate of an exhaust gas cleaning process in the metallurgical industry, in which at least a portion of the solid precipitate is washed with dissolution water, followed by extensive separation of water-insoluble materials. The water-soluble starting solution obtained during the separation is subjected to several successive treatment steps until the limit specifications are achieved for the product solution obtained after passing through the treatment steps. At least a portion of the water-insoluble materials obtained during the separation and / or the solids obtained during the treatment steps and / or the solids contained in one or more products of one or more treatment steps are fed to a primary process in the metallurgical industry. The apparatus for recycling valuables comprises suitable equipment, such as a feeder.

Description

Technical Field

[0001] The present invention relates to a method and an apparatus for recycling valuable substances in solid precipitation products from an adsorptive sodium bicarbonate-based flue gas cleaning operation applied to flue gases from the first primary process in the metallurgical industry, including the condensation of solid precipitation products.

Background Art

[0002] Known adsorptive sodium bicarbonate-based flue gas cleaning operations, including the condensation of solid precipitation products, generate large amounts of solid precipitation products containing valuable substances. The solid precipitation products may be disposed of as hazardous waste.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The object of the present invention is to provide a method and an apparatus for recycling valuable substances in solid precipitation products.

Means for Solving the Problems

[0004] The object is a method for recycling valuable substances in solid precipitation products by an adsorptive sodium bicarbonate-based flue gas cleaning operation applied to flue gases from the first primary process in the metallurgical industry, including the precipitation of solid precipitation products, in which substantially insoluble substances can be removed by combining at least a part of the solid precipitation products with dissolving water. In the method, the water-soluble starting solution obtained by the removal is subjected to a plurality of successive treatment steps until limit elements are obtained for the product solution obtained after the execution of the treatment step. One or more limit-related parameters are monitored and the treatment steps are controlled based on the monitoring results. This is achieved by a method characterized in that at least a portion of the water-insoluble substance obtained by removal, and / or the solid obtained in the processing step, and / or the solid present from one or more products from one or more processing steps, is supplied to the first primary process and / or other primary processes of the metallurgical industry. [Effects of the Invention]

[0005] Sodium bicarbonate is written as NaHCO3 and is also called baking soda.

[0006] The method of the present invention has the methodological features described above, but may also include other methodological features.

[0007] It should be noted that valuable substances refer to substances present in the exhaust gas to be cleaned—for example, dust or dust-containing substances. Such dust-containing substances are substances formed from substances present in the exhaust gas to be cleaned, for example, through physical reactions—for example, adsorption or absorption—or chemical reactions. For example, such a substance is ore powder discharged into the exhaust gas from a sintering plant. Otherwise, such a substance is a substance containing ore powder, for example, a substance added to the exhaust gas for exhaust gas cleaning, for example, ore powder adsorbed on activated carbon.

[0008] Valuable substances are substances suitable for supply to a primary process, that is, substances suitable for use in a primary process to improve the yield of the primary process or to form a product. The purpose is to supply valuable substances for use in a primary process that generates exhaust gas used in a washing operation, for example, in order to achieve a more environmentally friendly and less resource-intensive operational mode. Valuable substances are substances added to a primary process for the purpose of forming a product from them, such as ore dust contained in the exhaust gas obtained from a sintering process, i.e., iron ore dust when iron ore is sintered. Valuable substances in the exhaust gas may, for example, leave the primary process without being converted into the desired product (e.g., ore dust from a sintering process), or they may be converted into the desired product and then discharged with the exhaust gas (e.g., sintering dust from a sintering process). Treating valuable substances in the exhaust gas from a primary process as waste and discharging them from the economic value circuit, rather than discharging them from the economic value circuit, is resource-saving and therefore environmentally and economically feasible. The recycling of valuable substances is considered as input into the primary process within the scope of this application.

[0009] The primary process is understood to mean the process from which exhaust gases to be cleaned are obtained when the primary process products are generated; the primary process products are understood to mean the physical products and do not include heat or electricity as products. The primary process is in the metallurgical industry; it may be, for example, the operation of a sintering plant, the operation of a granulation plant, the operation of a steel mill converter using the LD / BOF method, or the operation of an EAF (electric arc furnace).

[0010] In the exhaust gas scrubbing operation with sodium bicarbonate groups applied to the exhaust gas obtained from the primary process, solid matter—also called solid deposits—is separated from the scrubbed exhaust gas. This includes, for example, dust from the primary process—e.g., ash, iron oxide, unused sodium bicarbonate, sodium carbonate, substances formed by chemical reactions with components of the exhaust gas—e.g., sodium sulfate or other substances introduced into the exhaust gas flow for exhaust gas scrubbing—or the reaction products and components of the exhaust gas flow. The latter substances are, for example, adsorbent materials that contribute to scrubbing by adsorption—e.g., activated carbon.

[0011] At least a portion of the solid precipitate is combined with the dissolving water, but all of the solid precipitate may also be combined with the dissolving water. For example, only 80 kg, only 95 kg, or all 100 kg of 100 kg of solid precipitate may be combined with the dissolving water. This portion may have the same composition as the entire solid precipitate, or it may differ in composition, and may be larger or smaller in terms of specific particle size or density compared to, for example, the average composition of the entire solid precipitate.

[0012] The combination with dissolving water can be carried out in a batch or continuous manner.

[0013] By combining with dissolving water, a heterogeneous mixture-suspension of substances is obtained, consisting of the liquid and a water-insoluble substance finely dispersed in the liquid. The combination with dissolving water substantially removes the water-insoluble substance, resulting in an aqueous starting solution. It should be noted that substantial removal means that at least 70% by mass, preferably at least 90% by mass, of the water-insoluble components of the solid precipitate combined with dissolving water is removed; the resulting aqueous starting solution may contain small amounts of water-insoluble substances, for example, in the form of a suspension. Removing as much water-insoluble substance as possible is advantageous because water-insoluble substances may contain valuable materials that are suitable for reuse in the primary process. Otherwise, the water-insoluble substances impair the effectiveness and / or efficiency of downstream processing steps. Methods available for substantial removal, depending on the method, include filtration (optionally under pressure), precipitation, and centrifugation. Different degrees of thorough removal of water-insoluble components are possible using economically acceptable levels of resources.

[0014] The aqueous starting solution obtained through removal undergoes a series of sequential processing steps.

[0015] The aqueous starting solution obtained by removal undergoes at least two processing steps; the processing modes of these processing steps may be the same or different.

[0016] Furthermore, multiple processing steps can be performed in one processing mode or multiple processing modes.

[0017] In a variation of one embodiment, at least one processing step, such as filtration, is carried out in a batch manner. In this case, buffer capacity should be ensured in the upstream and downstream processing steps, for example, by providing buffer containers.

[0018] In a variation of the preferred embodiment, all processing steps proceed continuously. This allows for a smaller and more economical configuration because it eliminates the need for buffer containers for batch operations, making control easier. For example, even plant components that cannot be operated continuously, such as a pressure filter, may require a redundant system to enable continuous processing. Preferably, the starting solution undergoes continuous processing until it reaches a limit value.

[0019] In this invention, the processing step is carried out until the product solution obtained through the processing step reaches a specified limit value.

[0020] In this invention, one or more limit-related parameters are monitored by measurement, and the processing steps are controlled based on the monitoring results.

[0021] Advantageously, in monitoring by measurement, the scan rate of the measurements is selected for one or more limit-related parameters so that the deviation from the expected or actual limit and the control requirements can be recognized with sufficient margin. In one variation, for monitoring, measurements are performed at least at regular time intervals, i.e., continuously. The time interval of measurements required to achieve appropriate control depends on the inertia of each processing step. The time interval at which measurements should be performed also depends on the evaluation time. The time interval at which measurements are performed also depends on the time required for evaluation. The time interval at which measurements are performed also depends on the nature of the formally defined limit. For example, time averaging or spot measurements may be required. Limit-related parameters are obtained by measuring the product solution and / or the starting solution and / or by measurements during the processing step or by measurements before or after a particular processing step. For example, if the limit specifies the concentration of fluoride ions, the measurement of parameters related to the limit of fluoride ion concentration is performed for the starting solution and the product solution, or for the starting solution only, after processing steps to reduce the concentration of fluoride ions—followed by other processing steps.

[0022] In the present invention, at least a part of the insoluble substances obtained by removal, and / or the solids obtained in the treatment step, and / or the solids present in one or more products from one or more treatment steps is supplied to the first primary process and / or other primary processes in the metallurgical industry.

[0023] Also, the insoluble substances having an appropriate moisture content, that is, the solids, may be sludge.

[0024] In the supply operation, prior to the input to the assumed primary process, a treatment process for facilitating the transportation of materials, such as a process of compressing to obtain coke or pellets, or a process for concentrating valuable substances is carried out. In the supply operation, the input to the assumed primary process may be preceded by a combination with other materials, and then the combined amount may be supplied.

[0025] Other primary processes are primary processes in the metallurgical industry, such as ore treatment, metal production, iron production, steel production, such as the operation of a sintering plant, the operation of a granulation plant, the operation of a steelmaking converter by the LD / BOF method, or the operation of an EAF (electric arc furnace).

[0026] In this way, the valuable substances present in the solid precipitate can be utilized. This is environmentally friendly and economically advantageous because, firstly, it is possible to reduce the amount of raw materials input in the primary process, and secondly, it is possible to reduce the resources required for disposal.

[0027] At least a part is recycled. For example, all of 100 kg is recycled, or 95% or more is recycled, or 90% or more is recycled, or only a part of 80 kg is recycled, or only the part whose particle size exceeds a specific limit is recycled, or only a part of a specific type, such as a part of "activated carbon-based materials", is recycled.

[0028] If the product obtained in one or more processing steps is a liquid product rather than a solid product, the product may optionally be subsequently processed to obtain a solid. This can be achieved, for example, by chemical treatment—e.g., precipitation—or physical treatment—e.g., adsorption or absorption onto solid particles.

[0029] Preferably, the processing step is at least one of chemical processing, mechanical processing, and physical processing.

[0030] Chemical processing is based on chemical reactions that involve adding reagents to form new substances, such as oxidation or salt formation. Chemical processing steps include, for example, pH adjustment, oxidation with hydrogen peroxide or hypochlorite, and ion exchange.

[0031] Physical treatment is based on physical processes such as adsorption and evaporation. Physical treatment steps include, for example, precipitation, adsorption by contact with added activated carbon or other adsorbents such as zeolites, and concentration by evaporation or osmosis.

[0032] Mechanical processing is similarly based on physical processing but further involves the application or action of force. Mechanical processing steps include filtration under the action of pressure, such as in a chamber filter press, or under the action of gravity, without the application of pressure, sedimentation, or centrifugal force, such as in centrifugation, such as ultrafiltration or membrane filtration, such as sand filtration.

[0033] Furthermore, the processing steps combine several processing modes, such as heavy metal precipitation with sulfides—e.g., organic sulfides—by chemical reaction and precipitation, or heavy metal precipitation with ion exchange—e.g., anionic polymers—by chemical reaction and precipitation, or other precipitation based on chemical reactions with the addition of a flocculant, or precipitation with a flocculant accompanied by adsorption and precipitation.

[0034] In a preferred embodiment, the product solution is released into the external environment—for example, into a body of water—once its composition has been sufficiently neutralized as a result of the processing steps.

[0035] For reasons other than ensuring safe release into the external environment, the starting solution is subjected to multiple sequential processing steps. The purpose of these steps is to achieve predetermined limit specifications for the resulting product solution after the processing steps. These limit specifications relate to, for example, the concentrations of heavy metal ions and heavy metal-containing ions, fluorides and fluoride-containing ions, phosphates and phosphate-containing ions, halides and halide-containing ions, dioxin concentrations, aromatic concentrations, and PCB concentrations. Limit specifications may also relate to quality standards (or multiple quality standards) such as COD (chemical oxygen demand), TOC (total organic carbon), TN (total nitrogen), and pH.

[0036] Limit specifications are set by process workers, for example, based on legal requirements.

[0037] In a preferred embodiment, the dissolved water, consisting of a solid precipitate product and dissolved water, includes wastewater from a wet exhaust gas scrubbing operation. This is an upstream wet exhaust gas scrubbing operation applied to exhaust gas, or a wet exhaust gas scrubbing operation applied to another exhaust gas from the same primary process, or a wet exhaust gas scrubbing operation applied to exhaust gas from another primary process.

[0038] By further utilizing the wastewater from the wet exhaust gas cleaning operation in this way, the method of the present invention is advantageous in that it can be implemented in a resource-saving, environmentally friendly, and economical manner.

[0039] In preferred embodiments, at least one treatment step is performed to reduce dissolved heavy metal ions or dissolved heavy metal-containing ions. It should be noted that, as used herein, reduction means reducing the content.

[0040] In preferred embodiments, at least one processing step is performed to reduce COD. It should be noted that, as used herein, reduction means a reduction in level.

[0041] In a preferred embodiment, at least one processing step is performed to reduce the TOC. It should be noted that, as used herein, reduction means a reduction in level.

[0042] In a preferred embodiment, at least one processing step is performed to establish a desired pH.

[0043] In preferred embodiments, at least one treatment step is performed to reduce dissolved fluoride or dissolved fluoride-containing ions. It should be noted that, as used herein, reduction means reducing the content.

[0044] In this processing step, for example, fluoride is precipitated by adding aluminum chloride, which separates most of the fluoride present in the starting solution.

[0045] In a preferred embodiment, at least one processing step is performed by an ion exchange material. Preferably, the ion exchange material is regenerative. The ion exchange material reduces the content of, for example, fluoride or nitrate. By using a selective ion exchange material, a controlled reduction is possible.

[0046] In preferred embodiments, at least one processing step can reduce total nitrogen (TN). It should be noted that, in this specification, reduction means lowering the level.

[0047] This can be achieved, for example, by adding sodium hypochlorite and then filtering it with an activated carbon filter.

[0048] In preferred embodiments, the product solution is used as a raw material source for another method—i.e., not as a primary step that generates exhaust gas to be washed—particularly if the composition of the product solution is favorable for that method. For example, the product solution can be concentrated and then the different substances can be fractionally crystallized and used, for example, by heat treatment by evaporation.

[0049] For example, sodium bicarbonate, or baking soda, can be obtained from the product solution in this way. Sodium bicarbonate can be used, for example, in exhaust gas scrubbing based on sodium bicarbonate.

[0050] Furthermore, the present invention provides a signal processing device comprising machine-readable program code, and a signal processing device command comprising control commands for performing the method according to the present invention.

[0051] Furthermore, the present invention provides a machine-readable program code for a signal processing device, the program code comprising control commands for causing the signal processing device to perform the method according to the present invention.

[0052] Furthermore, the present invention provides a storage medium for storing machine-readable program code according to the present invention.

[0053] Furthermore, the present invention provides an apparatus for carrying out the method of the present invention. The apparatus is for recirculating valuable substances from solid precipitate products by exhaust gas purification work based on sodium bicarbonate, which utilizes the adsorption properties applied to exhaust gas from the first primary process of the metallurgical industry, including the precipitation of solid precipitate products. A dissolution vessel for combining a solid precipitate product with dissolving water, comprising at least one dissolution vessel having at least one precipitate product addition conduit and at least one dissolving water supply pipe in communication with each other, To discharge the suspension from the dissolution container, at least one outlet is provided for the dissolution container, A precipitation apparatus for removing water-insoluble substances from a suspension to produce a starting solution, wherein the outlet is open to the precipitation apparatus, A processing apparatus for performing multiple sequential processing steps to produce a product solution, A starting solution conduit extending from the precipitation apparatus for introducing the starting solution into the processing apparatus, At least one product solution outlet proceeding from the processing apparatus, At least one monitoring device for detecting at least one parameter of the product solution, the monitoring device being connected to at least one closed-loop control device suitable for closed-loop control of the processing device based on the results from the monitoring device, A supply device for supplying solid material to the first primary process and / or other primary processes, This device is characterized by having the following features:

[0054] Optionally, one or more buffer vessels for the dissolution water or for the solid precipitate product are located upstream of the dissolution vessel, i.e., substantially in the dissolution water supply pipe or the precipitate product addition conduit.

[0055] Optionally, one or more buffer containers for the suspension are located downstream of the dissolution container, i.e., essentially at the outlet.

[0056] Optionally, one or more buffer vessels are located downstream of the deposition apparatus, i.e., essentially within the starting liquid conduit.

[0057] Optionally, one or more buffer containers are located downstream of the processing device, i.e., essentially at the outlet of the product solution.

[0058] Additionally, buffer containers may be provided within the processing unit.

[0059] The buffer container allows for the interconnection of parts of a method procedure that are executed at different speeds, thereby enabling a continuous method.

[0060] The processing apparatus includes multiple processing units for performing multiple sequential processing steps for the performance of the product solution.

[0061] Preferably, it is suitable to carry out a series of sequential processing steps consisting of at least one of chemical, mechanical, and physical treatments.

[0062] For each processing step, one or more processing units are prepared, arranged in series or in parallel.

[0063] For example, in a processing step to reduce COD, two processing units may be used to sequentially perform different steps for reducing COD. For example, in a processing step to reduce the content of dissolved heavy metal ions or dissolved heavy metal-containing ions, three processing units may be used (for example, one processing unit to establish a desired pH, one processing unit for precipitation, and one processing unit to remove the precipitated material). The precipitated material is then recycled back to the primary process, for example, after an optional subsequent dehydration process, i.e., in a dry state, or sent to a waste disposal site. Therefore, the processing unit for removing the precipitate may form part of the feed system.

[0064] Furthermore, for example, to adjust the pH, two or more processing units can be provided in a parallel apparatus that supplies the liquid to be processed through a common conduit, and the products can be discharged into the common conduit for supply to downstream processing steps, i.e., processing units. For other processing units, i.e., processing steps, a corresponding parallel or series arrangement can be used.

[0065] Viewed in the flow direction from the dissolution container to the product solution outlet, the product solution enters the first processing unit, and the liquid products from the preceding processing units each enter the downstream processing units. Viewed in the flow direction from the dissolution container to the product solution outlet, the product solution is discharged from the last processing unit.

[0066] The reagent supply ports are optionally open to each processing unit and function to controllly supply the reagents required for each process from the corresponding reagent storage containers.

[0067] The processing apparatus preferably comprises at least one processing unit for reducing dissolved heavy metal ions or dissolved heavy metal-containing ions.

[0068] The processing device preferably includes at least one processing unit for reducing COD.

[0069] The processing apparatus preferably comprises at least one processing unit for reducing TOC.

[0070] The processing apparatus preferably comprises at least one processing unit for establishing a desired pH.

[0071] The processing apparatus preferably includes at least one processing unit for reducing dissolved fluoride or ions containing dissolved fluoride.

[0072] The processing apparatus preferably comprises at least one processing unit that includes an ion exchange material. The apparatus in the present invention also preferably comprises an apparatus for regenerating the ion exchange material.

[0073] The processing apparatus preferably comprises at least one processing unit for reducing total nitrogen (TN).

[0074] The processing apparatus preferably includes at least one device for removing solid matter, such as a filter.

[0075] The monitoring device is suitable for detecting at least one parameter in the product solution. It can also detect multiple parameters in the product solution and / or one or more parameters in one or more processing steps. The control device is suitable for controlling the processing device based on the results from the monitoring device, and the control method in this invention is, for example, controlling each processing unit. The control device is connected in correspondence with the monitoring device to transmit the results.

[0076] Furthermore, multiple monitoring devices may be installed, with each monitoring device monitoring a single parameter or multiple parameters. Additionally, multiple control devices may be installed, with each control device controlling a single parameter or multiple parameters.

[0077] Furthermore, the monitoring device and the control device can be integrated into a single device.

[0078] The supply device is suitable for supplying solids to the first primary process and / or other primary processes. The supply device is suitable for supplying at least a portion of the water-insoluble substances obtained by removal and / or at least a portion of the solids obtained in the processing steps and / or at least a portion of the solids present from one or more products obtained from one or more processing steps.

[0079] To achieve this objective, the supply device includes, for example, a conveying device and / or a conduit. The conduit proceeds, for example, from a site associated with the formation of solids or water-insoluble substances (in the case of water-insoluble substances obtained during the removal process; the formation site is understood to mean the removal site) to a device for performing the (first) primary process and / or other primary processes. The conveying device is provided, for example, for moving solids within the conduit. The conveying device also includes a conveyor belt or a mobile container that receives solids at the site of solid formation and—optionally, after intermediate storage in, for example, a storage site i.e., a container, or silo—guides the solids to a device for performing the first primary process and / or other primary processes.

[0080] The supply device includes, for example, a device for storing solid materials.

[0081] The supply device includes, for example, a device for storing the products from the processing steps.

[0082] The supply device includes, for example, an apparatus for obtaining a solid from the product of the processing step.

[0083] For example, storage is performed when solid materials are supplied in batches rather than continuously to the first primary process and / or other primary processes, and a buffer is required for the resulting quantity. The supply device includes, for example, a device for extracting valuable substances, and for example, a device for concentrating valuable substances.

[0084] The supply is provided via a direct connection between the processing apparatus and / or the precipitation apparatus and the primary process. However, if, for example, a storage device is provided to buffer the amount obtained, or if a processing apparatus is provided to further process the material to be recycled, for example, to concentrate it, the supply is provided via an indirect connection between the processing apparatus and / or the precipitation apparatus and the primary process.

[0085] Such a device is used to carry out the method of the present invention.

[0086] The present invention will be described with reference to the schematic diagrams of the embodiments. [Brief explanation of the drawing]

[0087] [Figure 1] A general procedure for carrying out the method of the present invention using the apparatus of the present invention will be shown using the outline of one embodiment. [Figure 2] Figure 1 shows the details of the processing unit. [Figure 3] In relation to the initial primary step, a schematic diagram of the apparatus for carrying out the method of the present invention is shown. [Modes for carrying out the invention]

[0088] [Examples] Figure 1 shows a schematic representation of the procedure of the method according to the present invention in the apparatus according to the present invention, with reference to one embodiment.

[0089] The solid precipitate product 1 obtained from exhaust gas purification using sodium bicarbonate, which utilizes adsorption properties, is directed to the dissolution container 3 via the precipitate product addition conduit 2. In the dissolution container 3, the solid precipitate product is combined with dissolution water from the dissolution water supply pipe 4. The suspension formed in the dissolution container 3 is supplied via the discharge passage 5 from a precipitation device 6, which is schematically represented as a filter in this embodiment. A buffer container 20 for the suspension, optionally located in the discharge passage 5, is enclosed by a dashed line. The precipitation device 6 removes most of the non-water-soluble substances. If a filter is provided, at least 90% of the mass of the non-water-soluble substances is removed. The aqueous starting liquid obtained during removal is introduced into the treatment device 8 via the starting liquid conduit 7a. Although not particularly clearly shown, the buffer container 20 is located in the starting liquid conduit 7a between the filter and the treatment device.

[0090] The material outlet 7b, which is where the material proceeds from the deposition apparatus 6, is shown, i.e., the location for forming the water-insoluble material for the purposes of the present invention. The material outlet 7b is part of the supply apparatus. For clarity, the destination is not shown. As schematically shown in Figure 3, the supply apparatus can recirculate the water-insoluble material to a primary process, for example, to generate exhaust gas to be washed.

[0091] The processing device 8 is - Chemical treatment, - Mechanical processing, and - Physical processing It functions to execute multiple sequential processing steps from at least one of the processing methods comprising the following.

[0092] The processing step generates a product solution 9, which is then discharged from the processing device 8 via the product solution outlet 10a.

[0093] The material outlet 10b symbolizes one or more conduits leading from the site of solid formation during the processing steps. It / they are part of the feeder. For clarity, it is not specifically indicated where the feeder leads; the feeder may recirculate the solid to a primary process from which exhaust gas to be cleaned originates, for example; this is schematically shown in Figure 3.

[0094] The characteristics of the product solution 9 are to reach predetermined limits, and for example, multiple parameters can be obtained. The monitoring device 11, schematically represented by a linear monitoring conduit, monitors the parameters of the product solution 9 related to the predetermined limits. The processing steps performed in the processing apparatus 8 are controlled based on the results of monitoring by the control device 12. This is schematically represented by a wavy connection from the control device 12 to the processing apparatus. The transmission of the monitoring results from the control device 12 is schematically represented by the connection between the control device 12 and the monitoring device 11.

[0095] The product solution is released into the external environment, for example, schematically shown by arrow A, and / or used as a raw material source, schematically shown by arrow B.

[0096] Figure 2 shows a schematic example of a change in the procedure in the processing unit 8.

[0097] The processing apparatus 8 comprises multiple processing units for performing multiple sequential processing steps to produce the product solution 9. Two processing units 13 and 14 are arranged in a chain for processing step U, which reduces COD. For clarity, reagents including iron(II) sulfate (FeSO4), sulfuric acid (H2SO4), and hydrogen peroxide (H2O2) are not shown via reagent supply channels from the corresponding reagent storage containers. The starting solution flows from the dissolution container 3 towards the product solution outlet 10 into the first processing unit 13, viewed in the direction of flow. The liquid product from the upstream processing unit 13 flows into the downstream processing unit 14.

[0098] In processing unit 15, processing step V following processing step U is shown as an arbitrary fluorine precipitate with a dotted outline. For clarity, the supply of reagents containing aluminum chloride (AlCl3) via reagent dispenser from the corresponding reagent storage container is not shown.

[0099] In processing step W, following processing step V, the content of dissolved heavy metal ions or dissolved heavy metal-containing ions is reduced. For this purpose, as a minor processing step in processing unit 16, the pH is adjusted by adding sodium hydroxide solution (NaOH), and precipitation is induced by adding an organic sulfide, and such processing is continued in processing unit 17 by adding an anionic polymer. In processing unit 18a, for example in processing units 16 and / or 17, the suspended solids and precipitated substances formed by precipitation are largely removed. For clarity, the supply of reagents via reagent dispensers from the corresponding reagent storage containers is not shown.

[0100] The solid material is sent to its destination via the material outlet 18b, which is part of the supply device, after proceeding from the processing unit 18a. For clarity, the destination is not shown. The supply device recirculates the non-water-soluble material to a primary process, for example, from exhaust gas to be cleaned. This is schematically illustrated in Figure 3, as the material outlet 18b corresponds to the material outlet 10b.

[0101] The liquid product from processing unit 18a flows into processing unit 19, where processing step X, which reduces total nitrogen (TN), is performed. For clarity, the supply of reagents, including sodium hypochlorite (NaOCl), from the corresponding reagent storage containers via the reagent supply is not shown.

[0102] Filtration is performed using an activated carbon filter in the subsequent processing step Y.

[0103] In the subsequent processing step Z, the fluorine content filtered from processing step Y is reduced by ion exchange.

[0104] This yields product solution 9.

[0105] Since processing steps X and Z are arbitrary, they have the outline of a dotted line.

[0106] Figure 3 schematically represents the first primary process 21, for example, the sintering process. The exhaust gas from the sintering process undergoes exhaust gas purification using sodium bicarbonate, which utilizes adsorption, in the exhaust gas conduit 22. The discharge of the purified exhaust gas is indicated by a wavy arrow branching off from the conduit 22. The solid precipitate products from this exhaust gas purification process are processed as shown in Figure 1. This is shown in Figure 3, which shows that the exhaust gas conduit 22 leads to a rectangle 23. The rectangle 23 is shown in Figure 1. The supply device 24 is indicated by material outlets 7b and 10b, which correspond to the conduit in Figure 1. Optional storage devices 25 and processing devices 26 located in these conduits of the supply device are indicated by dotted lines.

[0107] The above description of the superior configuration of the present invention includes numerous features reflected in each of the dependent claims, and in some cases, in combinations of several features. However, these features are appropriately and individually considered and made combinable to provide further feasible combinations. In particular, in the method of the present invention, each of these features is individually combinable and can be any suitable combination.

[0108] In this specification and in the claims, even if some terms are used in relation to the singular form or a given number, the technical scope of the present invention is not limited to the singular form or a given number with respect to these terms. Furthermore, the term "a" is to be considered as an indefinite article, not as the number 1.

[0109] The characteristics, features, and advantages of the present invention described above, as well as the manner in which such characteristics and advantages are realized, will be more clearly and readily understood in relation to the description of embodiments of the present invention detailed in connection with the drawings. The embodiments are used to elucidate the present invention and do not limit the present invention to combinations of features specified herein, even if they are not related to functional features. Furthermore, preferred features of each embodiment can be clearly considered separately from that embodiment, can be introduced into other embodiments to complement them, and can be combined with any claim.

[0110] Even if the present invention is illustrated and described in detail by preferred embodiments, it is not limited to the disclosed embodiments, and other modifications are possible without departing from the scope of protection of the invention as described in the claims. [Explanation of Symbols]

[0111] 1 Solid precipitation product 2 Precipitated product addition conduit 3 Melting container 4 Dissolution water supply pipe 5 Exhaust channel 6 Precipitation device 7a Starting liquid conduit 7b Material outlet 8 Processing Unit 9 Product solution 10a Product solution outlet 10b Material outlet 11 Monitoring equipment 12 Control device 13. First processing unit (upstream processing unit) 14 Downstream Processing Unit 15 Processing Units 16 Processing Units 17 Processing Units 18a Processing Unit 18b Material outlet 19 Processing Units 20 Buffer container 21 First Primary Process 22 Exhaust gas conduit 23 rectangle 24 Feeding device 25 Storage equipment 26 Processing Unit U Processing Step V Processing Step W processing step X processing step Y Processing Step Z processing step

Claims

1. A method for recirculating valuable substances from solid precipitate products by exhaust gas purification using sodium bicarbonate, which utilizes adsorption properties and is applied to exhaust gas from the first primary process of the metallurgical industry, including the precipitation of solid precipitate products, wherein at least a portion of the solid precipitate product can be substantially removed by combining it with dissolved water, in the said method, The aforementioned first primary process is the operation of a sintering plant or a granulation plant. The aforementioned valuable substance is an ore powder and / or a material containing ore powder. In the above method, the water-soluble starting solution obtained by removal is subjected to multiple successive processing steps until the limit specification is obtained for the product solution obtained after the execution of the processing step. One or more limit-related parameters are monitored, and processing steps are controlled based on the monitoring results. A method characterized in that at least a portion of the water-insoluble substance obtained by removal, and / or the solid obtained in the processing step, and / or the solid present from one or more products from one or more of the processing steps, is supplied to the first primary step.

2. The method according to claim 1, characterized in that the supply includes the processing step.

3. The method according to 1 or 2, characterized in that the processing step is at least one of chemical processing, mechanical processing, and physical processing.

4. The method according to any one of claims 1 to 3, characterized in that the product solution is released into the external environment.

5. The method according to any one of claims 1 to 4, characterized in that the dissolved water includes wastewater from wet exhaust gas cleaning operations.

6. The method according to any one of claims 1 to 5, characterized in that, in at least one of the processing steps, dissolved heavy metal ions or dissolved heavy metal-containing ions are reduced.

7. The method according to any one of claims 1 to 6, characterized in that the product solution is used as a raw material source.

8. An apparatus for recirculating valuable substances from solid precipitate products by exhaust gas purification using sodium bicarbonate, which utilizes the adsorption properties applied to exhaust gas from the first primary process of a metallurgical industry, including the precipitation of solid precipitate products, wherein the first primary process is the operation of a sintering plant or a granulation plant, and the valuable substances are ore powder and / or materials containing ore powder, A dissolution vessel for combining a solid precipitate product with dissolving water, wherein at least one precipitate product addition conduit and at least one dissolving water supply pipe are in communication with each other, To discharge the suspension from the dissolution container, at least one outlet is provided that leads from the dissolution container, A precipitation apparatus for removing water-insoluble substances from a suspension to produce a starting solution, wherein the outlet of the precipitation apparatus is open to the precipitation apparatus, A processing apparatus for performing multiple sequential processing steps to produce a product solution, A starting solution conduit extending from the deposition apparatus for introducing the starting solution into the processing apparatus, At least one product solution outlet from the processing apparatus, At least one monitoring device for detecting at least one parameter of the product solution, the monitoring device being connected to at least one closed-loop control device suitable for closed-loop control of the processing apparatus based on the results from the monitoring device, At least one supply device for supplying solid material to the first primary process and / or other primary processes, A device characterized by being equipped with the following features.

9. The apparatus according to claim 8, characterized in that the apparatus comprises at least one processing unit for reducing dissolved heavy metal ions or dissolved heavy metal-containing ions.

10. The apparatus according to claim 8 or 9, characterized in that the processing apparatus comprises at least one device for removing solid matter.

11. The apparatus according to any one of claims 8 to 10, characterized in that the supply device is equipped with a device for storing solid matter.

12. The apparatus according to any one of claims 8 to 11, characterized in that the supply device includes a device for obtaining a fixed substance from the product of the processing step.

13. The apparatus according to any one of claims 8 to 12, characterized in that the supply device includes a device for concentrating a valuable substance.

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