Blast furnace cloth bag ash dezincification equipment and system

Abstract

The utility model relates to the technical field of steel production, and discloses a blast furnace cloth bag ash dezincification device and a blast furnace cloth bag ash dezincification system, the device comprises an acid leaching dezincification tank, an impurity removal purification tank, a zinc liquid separator, a filtering device, a concentration device and a zinc liquid electrodeposition tank, the acid leaching dezincification tank is used for carrying out acid soaking on the ash residues, so that zinc oxide in the ash residues is converted into zinc sulfate, and zinc is converted into a liquid phase from a solid phase; the impurity removal and purification tank is communicated with the acid leaching dezincification tank and is used for precipitating and separating out iron ions and other heavy metal ions dissolved in the acid leaching dezincification section and conveying zinc-containing supernate to the zinc liquid separator; the filtering device is communicated with the zinc liquid separator and is used for removing suspended matters in the zinc liquid; the concentration device is communicated with the filtering device and is used for concentrating the zinc liquid; the liquid zinc electrodeposition cell is communicated with the concentration device and is used for electrodepositing high-purity metal zinc; the equipment can complete dezincification of blast furnace cloth bag ash, and realizes resource reutilization of zinc.

Description

Technical Field

[0001] The utility model relates to the technical field of steel production, in particular to a blast furnace bag ash dezincification device and system. Background Art

[0002] In recent years, my country has vigorously strengthened environmental protection, resource conservation, clean production, and circular economy. The long-term extensive production model of steel enterprises has been subject to increasingly stringent constraints, and large steel enterprises are actively exploring various dust recycling and utilization models.

[0003] The dust removal ash from the production system of steel enterprises, especially the sintering field ash and blast furnace bag ash, contains a certain amount of substances that are beneficial to resource conservation (coke, iron, calcium oxide, etc.), which should be recycled as much as possible; but it also inevitably accumulates a certain amount of elements such as zinc that are not conducive to recycling and must be effectively removed.

[0004] Therefore, how to complete the dezincification of blast furnace bag ash and realize the resource recycling of zinc has become a technical problem to be solved urgently in this field. Utility Model Content

[0005] The utility model aims to provide a blast furnace bag ash dezincification device and system. The blast furnace bag ash dezincification device can not only complete the dezincification of the blast furnace bag ash, but also realize the resource utilization of zinc.

[0006] In order to achieve the above object, the utility model provides the following technical solutions:

[0007] A blast furnace bag ash dezincification equipment comprises an acid leaching dezincification tank, an impurity removal and purification tank, a zinc liquid separator, a filtering device, a concentrating device, and a zinc liquid electrolytic deposition tank; the acid leaching dezincification tank is used for acid leaching the ash to convert the zinc oxide in the ash into zinc sulfate, and convert the zinc from the solid phase into the liquid phase; the impurity removal and purification tank is connected with the acid leaching dezincification tank, and the impurity removal and purification tank is used for precipitating the iron ions and other heavy metal ions dissolved in the acid leaching dezincification section, and conveying the zinc-containing supernatant to the zinc liquid separator; the filtering device is connected with the zinc liquid separator, and the filtering device is used for removing suspended matter in the zinc liquid; the concentrating device is connected with the filtering device, and the concentrating device is used for concentrating the zinc liquid; the zinc liquid electrolytic deposition tank is connected with the concentrating device, and the zinc liquid electrolytic deposition tank is used for electrolytic deposition of high-purity metallic zinc.

[0008] When the blast furnace bag ash dezincification equipment is working, the blast furnace bag ash after impurity removal and dehydration is first transported to the acid leaching zinc removal tank to realize the transformation of zinc from solid phase to liquid phase; then the zinc liquid is transported to the impurity removal purification tank to precipitate iron ions and other heavy metal ions, and then the zinc-containing supernatant is transported to the filtering device through the zinc liquid separator to remove suspended matter in the zinc liquid; then the filtered zinc liquid is transported to the concentrating device to concentrate the zinc liquid; finally, the concentrated zinc liquid is transported to the zinc liquid electrolytic tank for electrolytic deposition of high-purity metallic zinc, so as to facilitate the reuse of zinc.

[0009] Therefore, this blast furnace bag ash dezincification equipment can not only complete the dezincification of blast furnace bag ash, but also realize the resource recycling of zinc.

[0010] Optionally, the filtering device includes a zinc liquid purification tank and a zinc liquid ultrafilter; the zinc liquid separator is connected to one end of the zinc liquid purification tank, and the zinc liquid purification tank is used to remove large suspended particles in the zinc liquid; the zinc liquid ultrafilter is connected to the other end of the zinc liquid purification tank, and the zinc liquid ultrafilter is used to remove fine suspended matter in the zinc liquid.

[0011] Optionally, the concentrating device includes a concentrating pressure pump and a concentrating module; the concentrating pressure pump is used to transport the zinc liquid filtered by the filtering device to the concentrating module; the concentrating module is used to separate water and salt in the zinc liquid under the pressure of the concentrating pressure pump to obtain zinc-rich liquid.

[0012] Optionally, the blast furnace bag ash dezincification equipment also includes an alkali adding device; the alkali adding device is used to provide alkali solution to the impurity removal purification tank to adjust the pH value of the impurity removal purification tank to 3-4.

[0013] Optionally, the blast furnace bag ash dezincification equipment also includes a dosing device; the dosing device is used to provide flocculants to the zinc liquid purification tank to remove large suspended particles in the zinc liquid.

[0014] Optionally, the zinc liquid ultrafilter comprises a cross-flow filter element; the cross-flow filter element is used to remove fine suspended matter in the zinc liquid.

[0015] Optionally, a new sulfuric acid liquid reagent replenishing device is provided in the zinc liquid electrolytic deposition tank; the new sulfuric acid liquid reagent replenishing device is used to adjust the acidity of the electrolyte in real time according to the electrolytic deposition working conditions; a plurality of electrolytic deposition chambers are also provided in the zinc liquid electrolytic deposition tank, and the electrolytic deposition chambers include anode plates and cathode plates; the anode plates are made of inert metal materials, and the cathode plates are made of zinc plates or zinc meshes.

[0016] Optionally, the blast furnace bag ash dezincification equipment also includes an acid adding device; the acid adding device is used to add an acid agent into the zinc liquid electrowinning tank.

[0017] A blast furnace bag ash dezincification system comprises any one of the above-mentioned blast furnace bag ash dezincification equipment.

[0018] Optionally, the blast furnace bag ash dezincification system further includes ash recovery equipment; the ash recovery equipment is used to recover the residual ash in the impurity removal purification tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0020] Figure 1 A schematic diagram of the structure of a blast furnace bag ash dezincification device provided in an embodiment of the utility model;

[0021] Figure 2 A schematic structural diagram of a blast furnace bag ash dezincification system provided in an embodiment of the utility model.

[0022] Icons: 1-acid leaching dezincification tank; 2-impurity removal and purification tank; 3-zinc liquid separator; 4-filtration device; 5-concentration device; 6-zinc liquid electrolytic tank; 7-zinc liquid purification tank; 8-zinc liquid ultrafilter; 9-concentration pressure pump; 10-concentration module; 11-alkali adding device; 12-dosing device; 13-acid adding device; 14-water pump; 15-ash recovery equipment. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention includes such modifications and variations within the scope of the appended claims and their equivalents.

[0024] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense. For example, they can be fixedly connected or detachably connected; they can be directly connected or indirectly connected through an intermediate component. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] Figure 1The schematic diagram of the structure of the blast furnace bag ash dezincification equipment provided by the utility model embodiment is as follows: Figure 1 As shown, the embodiment of the utility model provides a blast furnace bag ash dezincification equipment, including an acid leaching dezincification tank 1, an impurity removal and purification tank 2, a zinc liquid separator 3, a filtering device 4, a concentrating device 5, and a zinc liquid electrolytic deposition tank 6; the acid leaching dezincification tank 1 is used to acidly soak the ash to convert the zinc oxide in the ash into zinc sulfate, and convert the zinc from the solid phase to the liquid phase; the impurity removal and purification tank 2 is connected to the acid leaching dezincification tank 1, and the impurity removal and purification tank 2 is used to precipitate the iron ions and other heavy metal ions dissolved in the acid leaching dezincification section, and transport the zinc-containing supernatant to the zinc liquid separator 3; the filtering device 4 is connected to the zinc liquid separator 3, and the filtering device 4 is used to remove suspended matter in the zinc liquid; the concentrating device 5 is connected to the filtering device 4, and the concentrating device 5 is used to concentrate the zinc liquid; the zinc liquid electrolytic deposition tank 6 is connected to the concentrating device 5, and the zinc liquid electrolytic deposition tank 6 is used to electrolyze high-purity metallic zinc.

[0026] In this embodiment, when the blast furnace bag ash dezincification equipment is working, the blast furnace bag ash after impurity removal and dehydration is first transported to the acid leaching zinc removal tank 1 to realize the transformation of zinc from solid phase to liquid phase; then the zinc liquid is transported to the impurity removal purification tank 2 to precipitate iron ions and other heavy metal ions, and then the zinc-containing supernatant is transported to the filtering device 4 through the zinc liquid separator 3 to remove suspended matter in the zinc liquid; then the filtered zinc liquid is transported to the concentrating device 5 to concentrate the zinc liquid; finally, the concentrated zinc liquid is transported to the zinc liquid electrowinning tank 6 to electrowinning high-purity metallic zinc, so as to facilitate the reuse of zinc.

[0027] Wherein, the blast furnace bag ash can be transported to the acid leaching dezincification tank 1 by the feeder;

[0028] In addition, the zinc liquid separator 3 may include a plate-frame filter press, which has the beneficial effects of large filtering driving force, clear filtrate, and high solid recovery rate;

[0029] In addition, several water pumps 14 can be provided to realize the transportation of zinc liquid; that is, water pumps 14 can be provided between the acid leaching dezincification tank 1 and the impurity removal purification tank 2, and between the zinc liquid separator 3 and the filtering device 4, so as to realize the transportation between different sections of zinc liquid.

[0030] Therefore, this blast furnace bag ash dezincification equipment can not only complete the dezincification of blast furnace bag ash, but also realize the resource recycling of zinc.

[0031] refer to Figure 1 As an optional embodiment, the filtering device 4 includes a zinc liquid purification tank 7 and a zinc liquid ultrafilter 8; the zinc liquid separator 3 is connected to one end of the zinc liquid purification tank 7, and the zinc liquid purification tank 7 is used to remove large suspended particles in the zinc liquid; the zinc liquid ultrafilter 8 is connected to the other end of the zinc liquid purification tank 7, and the zinc liquid ultrafilter 8 is used to remove fine suspended matter in the zinc liquid.

[0032] In this embodiment, the provision of the zinc liquid purification tank 7 and the zinc liquid ultrafilter 8 can gradually filter out the suspended matter doped in the zinc liquid, thereby improving the purity of zinc and further achieving the removal of impurities.

[0033] refer to Figure 1 As an optional embodiment, the concentration device 5 includes a concentration pressure pump 9 and a concentration module 10; the concentration pressure pump 9 is used to transport the zinc liquid filtered by the filtering device 4 to the concentration module 10; the concentration module 10 is used to separate the water and salt in the zinc liquid under the pressure of the concentration pressure pump 9 to obtain zinc-rich liquid.

[0034] In this embodiment, under actual working conditions, the salt-free clear liquid separated in the concentration module 10 can be used to be recycled to an external desalination system to further achieve resource reuse.

[0035] like Figure 1 As shown, as an optional embodiment, the blast furnace bag ash dezincification equipment also includes an alkali adding device 11; the alkali adding device 11 is used to provide alkali solution to the impurity removal purification tank 2 to adjust the pH value of the impurity removal purification tank 2 to 3-4.

[0036] In this embodiment, the alkali adding device 11 can also transport the alkali solution to the impurity removal purification tank 2 through the water pump 14 .

[0037] Continue to refer Figure 1 As an optional embodiment, the blast furnace bag ash dezincification equipment also includes a dosing device 12; the dosing device 12 is used to provide flocculants to the zinc liquid purification tank 7 to remove large suspended particles in the zinc liquid.

[0038] In this embodiment, similarly, the dosing device 12 can also deliver the flocculant to the zinc removal liquid purification tank 7 via the water pump 14 .

[0039] As an optional embodiment, the zinc liquid ultrafilter 8 includes a cross-flow filter element; the cross-flow filter element is used to remove fine suspended matter in the zinc liquid.

[0040] In this embodiment, the principle of the cross-flow filter element to remove fine particles is as follows: the pressurized raw liquid passes through the surface of the cross-flow filter element in parallel, and part of the water flows through the cross-flow filter element. The concentration of the retained particles in the remaining water flow becomes higher and higher. Since the solution flows continuously, the retained particles will not be deposited, but will be carried away by another part of the concentrated liquid.

[0041] Therefore, the substances intercepted by the cross-flow filter element are continuously carried away by the concentrated liquid, which is equivalent to the continuous cleaning of the surface of the cross-flow filter element to a certain extent, thus extending the working cycle of the cross-flow filter element and reducing the cost of maintenance and cleaning.

[0042] As an optional embodiment, a new sulfuric acid liquid reagent replenishing device is provided in the zinc liquid electrolytic deposition tank 6; the new sulfuric acid liquid reagent replenishing device is used to adjust the acidity of the electrolyte in real time according to the electrolytic deposition working conditions; a plurality of electrolytic deposition chambers are also provided in the zinc liquid electrolytic deposition tank 6, and the electrolytic deposition chambers include anode plates and cathode plates; the anode plates are made of inert metal materials, and the cathode plates are made of zinc plates or zinc meshes.

[0043] In this embodiment, the negatively charged ions in the zinc solution are precipitated at the anode, and the specific reaction is as follows:

[0044] Cathode reaction: Zn 2+ +2e→Zn↓;

[0045] Anode reaction: 2OH - -2e→H2O+O2↑;

[0046] The overall reaction formula of zinc liquid electrolysis: ZnSO4+H2O+e→Zn↓+O2↑+H2SO4;

[0047] Since the electrolytic reaction will generate a large amount of heat, an auxiliary solution heat exchange device can be set in the zinc liquid electrolytic tank 6 to adjust the electrolytic reaction temperature in the zinc liquid electrolytic tank 6.

[0048] A cathode plate lifting device may be provided above the zinc liquid electrowinning tank 6. When zinc electrowinning on the cathode plate is enriched to a certain extent, the cathode plate is moved out of the zinc liquid electrowinning tank 6 by the cathode plate lifting device to realize zinc recovery.

[0049] In addition, a zinc washing tank can be arranged behind the zinc liquid electrowinning tank 6, and the produced zinc completes the cleaning process in the washing tank and is finally transported to the product warehouse by a forklift.

[0050] In addition, the residual electrolyte in the zinc liquid electrolytic tank 6 can be recycled to the front-end acid leaching dezincification tank 1 through the electrolyte circulation pump.

[0051] As an optional embodiment, the blast furnace bag ash dezincification equipment further includes an acid dosing device 13 ; the acid dosing device 13 is used to add an acid agent into the zinc liquid electrowinning tank 6 .

[0052] In this embodiment, by adding an acidifier into the zinc liquid electrowinning tank 6 at the right time, suitable electrowinning conditions can be met.

[0053] In addition, in the same manner, the acid dosing device 13 can also deliver the acid to the zinc liquid electrowinning tank 6 via the water pump 14 .

[0054] Figure 2 The schematic diagram of the structure of the blast furnace bag ash dezincification system provided by the embodiment of the utility model is as follows: Figure 2 As shown, an embodiment of the utility model further provides a blast furnace bag ash dezincification system, comprising any one of the above-mentioned blast furnace bag ash dezincification equipment.

[0055] refer to Figure 2 As an optional embodiment, the blast furnace bag ash dezincification system also includes an ash recovery device 15; the ash recovery device 15 is used to recover the residual ash in the impurity removal purification tank 2.

[0056] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A blast furnace bag ash dezincification equipment, characterized in that: include: Acid leaching zinc removal tank, impurity removal purification tank, zinc liquid separator, filtration device, concentration device, and zinc liquid electrowinning tank; The acid leaching dezincification tank is used to perform acid leaching on the ash to convert the zinc oxide in the ash into zinc sulfate, thereby converting zinc from the solid phase into the liquid phase; The impurity removal and purification tank is connected to the acid leaching and zinc removal tank, and the impurity removal and purification tank is used to precipitate the iron ions and other heavy metal ions dissolved in the acid leaching and zinc removal section, and transport the zinc-containing supernatant to the zinc liquid separator; The filtering device is in communication with the zinc liquid separator, and the filtering device is used to remove suspended matter in the zinc liquid; The concentrating device is in communication with the filtering device, and the concentrating device is used to concentrate the zinc solution; The zinc liquid electrowinning tank is in communication with the concentrating device, and the zinc liquid electrowinning tank is used for electrowinning high-purity metallic zinc.

2. The blast furnace bag ash dezincification equipment according to claim 1, characterized in that: The filtering device comprises a zinc liquid purification tank and a zinc liquid ultrafilter; The zinc liquid separator is connected to one end of the zinc liquid purification tank, and the zinc liquid purification tank is used to remove large suspended particles in the zinc liquid; The zinc liquid ultrafilter is connected to the other end of the zinc liquid purification tank, and the zinc liquid ultrafilter is used to remove fine suspended matter in the zinc liquid.

3. The blast furnace bag ash dezincification equipment according to claim 1, characterized in that: The concentrating device comprises a concentrating pressure pump and a concentrating module; The concentration pressure pump is used to transport the zinc liquid filtered by the filtering device to the concentration module; The concentration module is used to separate the water and salt in the zinc liquid under the pressure of the concentration pressure pump to obtain zinc-rich liquid.

4. The blast furnace bag ash dezincification equipment according to claim 1, characterized in that: The blast furnace bag ash dezincification equipment also includes an alkali adding device; The alkali adding device is used to provide alkali solution to the impurity removal purification tank so that the pH value of the impurity removal purification tank is adjusted to 3-4.

5. The blast furnace bag ash dezincification equipment according to claim 2, characterized in that: The blast furnace bag ash dezincification equipment also includes a dosing device; The dosing device is used to provide flocculants to the zinc liquid purification tank to remove large suspended particles in the zinc liquid.

6. The blast furnace bag ash dezincification equipment according to claim 2, characterized in that: The zinc liquid ultrafilter comprises a cross-flow filter element; The cross-flow filter element is used to remove fine suspended matter in zinc liquid.

7. The blast furnace bag ash dezincification equipment according to claim 1, characterized in that: A new sulfuric acid liquid reagent replenishing device is provided in the zinc liquid electrowinning tank; The new sulfuric acid solution replenishing device is used to adjust the acidity of the electrolyte in real time according to the electrolytic working conditions; The zinc liquid electrolytic cell is also provided with a plurality of electrolytic chambers, and the electrolytic chambers include anode plates and cathode plates; the anode plates are made of inert metal materials, and the cathode plates are made of zinc plates or zinc meshes.

8. The blast furnace bag ash dezincification equipment according to claim 7, characterized in that: The blast furnace bag ash dezincification equipment also includes an acid adding device; The acid adding device is used to add an acid agent into the zinc liquid electrowinning tank.

9. A blast furnace bag ash dezincification system, characterized in that: It comprises the blast furnace bag ash dezincification equipment as described in any one of claims 1 to 8.

10. The blast furnace bag ash dezincification system according to claim 9, characterized in that: The blast furnace bag ash dezincification system also includes ash recovery equipment; The ash recovery equipment is used to recover the residual ash in the impurity removal purification tank.

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