Device and method for synergistically preparing high-quality zinc through zinc electrolysis acid mist treatment

Abstract

The invention relates to a device and method for synergistically preparing high-quality zinc through zinc electrolysis acid mist treatment. A cation exchange membrane and a first anion exchange membrane are vertically arranged in an electrolytic bath in parallel, and the electrolytic bath is divided into a cathode chamber, a wastewater reaction chamber and an anode chamber which are isolated from one another; the first polar plate is vertically arranged on the side, close to the cation exchange membrane, in the cathode chamber in a front-back adjustable manner, the second polar plate is vertically arranged on the side, close to the first anion exchange membrane, in the anode chamber in a front-back adjustable manner, the anode plate is sleeved with a filter cloth bag, the filter cloth bag is sleeved with an anode frame, and the anode frame is provided with an exhaust port; the acid mist is absorbed by water after passing through the fan to prepare dilute sulphuric acid, the dilute sulphuric acid is returned to a zinc system for use, and produced sodium sulfate is high in purity and can be directly sold or used as an additive for removing iron by a sodium jarosite method, so that centralized treatment and recycling of the zinc electrolysis acid mist are realized, and the problem of acid mist is solved from the source.

Description

Technical Field

[0001] The present application relates to the technical field of smelting electrolysis equipment, and in particular to a device and method for synergistically preparing high-quality zinc by treating zinc electrolytic acid mist. Background Art

[0002] Impurities affecting zinc quality come not only from new solution, but also from the promotion of long-cycle zinc electrolysis processes. All zinc smelting companies have implemented stricter control over the content of impurity elements in new solution, and the monitoring scope has been extended from traditional elements such as cobalt, nickel, arsenic, antimony, and germanium to rare elements such as selenium, tellurium, and thallium. As a result, the impurity elements introduced into the new solution that affect zinc quality are becoming lower and lower. During the zinc electrolysis process, the divalent manganese ions in the solution will be oxidized to manganese dioxide at the anode, which adheres to the anode plate to form a film that protects the anode plate. However, as the anode plate is used for a longer time, this film will fall off the anode plate and enter the electrolyte. The anode mud has a complex composition, containing elements such as lead and calcium in addition to manganese. When the electrolyte circulates, it flows to the cathode accessories and enters the cathode zinc sheet, affecting the quality of the zinc sheet. In addition, when there are high levels of chloride ions in the electrolyte, it will corrode the lead-silver alloy plate, causing lead to dissolve into the electrolyte and ultimately affect the quality of the zinc sheet. After zinc smelting enterprises improved the quality of new liquid, the quality of zinc flakes was greatly improved, and the output rate of No. 0 zinc was also greatly increased. However, in order to further improve the quality of zinc flakes, it is necessary to solve the problem of lead dissolving from anode mud and anode lead-silver alloy plates into the electrolyte.

[0003] In the prior art, CN202211358294.6 discloses a method for hydrometallurgical zinc smelting to purify manganese from a sulfuric acid-containing zinc solution in one step and produce low-iron zinc. The method involves separating an electrolytic cell into an anode chamber and a cathode chamber using a microporous diaphragm or anion membrane. Manganese ions are oxidized in the anode chamber, primarily to precipitate manganese dioxide, while zinc is reduced in the cathode chamber to precipitate metallic zinc. This method can improve zinc quality to a certain extent, but it cannot address the acid mist generated or the continuous accumulation of anode mud.

[0004] CN202311292679.1 discloses a method for extracting high-quality zinc by co-electrowinning of manganese and zinc, wherein the cathode is loaded into a cathode frame composed of a conductive diaphragm, and the cathode frame is then placed in an electrolytic cell to which an electrolyte is added for electrolysis. During the electrolysis process, the anolyte and catholyte circulate separately, and part of the anolyte waste liquid is discharged to the subsequent zinc smelting system for continued use. The anolyte circulating alone is reduced, and part of the catholyte is discharged into the electrolytic cell to replenish the discharged anolyte, which is used as the anolyte. The catholyte circulating alone is reduced, and new liquid is added to the catholyte and fully mixed, and then used as the catholyte circulating in the cathode frame. This method can further purify the electrolyte, improve zinc quality, and co-process anode mud, but it cannot simultaneously solve the problem of acid mist generated. Summary of the Invention

[0005] In order to solve or partially solve the problems existing in the related art, the present application provides a device and method for the coordinated preparation of high-quality zinc by zinc electrolysis acid mist treatment, which can reduce the generation of acid mist, reduce the possibility of corrosion of electrolysis auxiliary equipment such as conductive bars, increase service life, and stably produce high-quality zinc.

[0006] The present application discloses a device for synergistically preparing high-quality zinc by treating zinc electrolytic acid mist, comprising an electrolytic cell, a cathode plate, an anode plate, a cation exchange membrane, a first anion exchange membrane, and a DC power supply;

[0007] The electrolytic cell is provided with a water inlet and outlet, a cathode plate and an anode plate are arranged therein and are electrically connected to a DC power supply; and further comprises:

[0008] Induced draft fan, filter bag, anode frame; the anode frame is equipped with an exhaust port;

[0009] Among them, the cation exchange membrane and the first anion exchange membrane are vertically arranged parallel to each other in the electrolytic cell and divide the electrolytic cell into a cathode chamber, a wastewater reaction chamber, and an anode chamber that are isolated from each other; the tops of the cathode chamber, the wastewater reaction chamber, and the anode chamber are provided with air outlets and are connected to the induced draft fan through pipelines; a filter bag is set on the anode plate, and an anode frame is set outside the filter bag.

[0010] Optionally, the anode frame is a frame composed of an ion membrane, and the ion membrane is a type II anion exchange membrane.

[0011] Optionally, the water inlet and outlet are respectively arranged at the upper and lower parts of the cathode chamber and the anode chamber, and the cathode chamber and the anode chamber are respectively connected to the external circulation pipe and circulation pump through the water inlet and outlet to form a circulation loop.

[0012] Optionally, the filter bag is made of PP or polypropylene with an air permeability of 10-30 liters / square meter / min.

[0013] Optionally, a water washing tank is provided on one side of the electrolytic cell, and the gas sucked by the induced draft fan is washed in the water washing tank and then discharged.

[0014] Optionally, the exhaust port is located above the liquid level of the electrolyte.

[0015] A method for acid mist treatment and zinc preparation using the above-mentioned zinc electrolytic acid mist treatment and coordinated preparation of high-quality zinc device specifically comprises the following steps:

[0016] S1. Equipment preparation: Put a filter bag on the outside of the anode plate, put an anode frame on the outside of the filter bag, place the first anion exchange membrane on one side of the anode frame, and place the cation exchange membrane on one side of the cathode plate. Fix the cathode plate and the anode plate in the electrolytic cell and adjust their positions to form a cathode chamber, wastewater reaction chamber, and anode chamber that are isolated from each other. Electrically connect the cathode plate and the anode plate to the power port of the DC power supply respectively. Then, connect the cathode chamber and the anode chamber to the external circulation pipe and circulation pump through their respective water inlets and outlets to form a circulation loop. At the same time, connect the preset air outlets of the cathode chamber, wastewater reaction chamber, and anode chamber to the induced draft fan through pipes.

[0017] S2. Electrolyte preparation: Add predetermined amounts of electrolyte and dilute sulfuric acid into the prepared cathode chamber and anode chamber, respectively;

[0018] S3. Electrolysis: Start the DC power supply to supply power to the cathode plate and the anode plate for electrolysis. At the same time, start the circulation pump connecting the cathode chamber and the anode chamber to form an internal circulation of the electrolyte in the cathode chamber and the anode chamber respectively. At the same time, remove the gas generated by electrolysis from the gas outlet of each chamber to the induced draft fan. The tail gas is absorbed by water and alkali solution to produce dilute sulfuric acid and sodium sulfate solution.

[0019] Optionally, the filter bag is made of acid-resistant material with an air permeability of 10-30 l / m2 / min.

[0020] Optionally, the main components of the electrolyte in the electrolyte preparation step are H2SO4 145-155 g / L, Zn 40-50 g / L, Mg 18-25 g / L, Mn 4-8 g / L, and Na 2-4 g / L; the impurity content is Co<0.5 mg / L, Cd<0.5 mg / L, Cu<0.2 mg / L, As<0.01 mg / L, Sb<0.01 mg / L, Ge<0.05 mg / L, Fe<10 mg / L, Se<5 mg / L, Te<0.5 mg / L, and Pb<0.2 mg / L.

[0021] Optionally, during the preparation of the electrolyte, electrolyte and dilute sulfuric acid are added to the cathode chamber and the anode chamber respectively; or during the preparation of the electrolyte, electrolyte is added to the cathode chamber and the anode chamber respectively.

[0022] The technical solution provided by this application may have one of the following beneficial effects:

[0023] (1) The acid mist is absorbed by the water after passing through the fan to produce dilute sulfuric acid, which is returned to the zinc system for use. The produced sodium sulfate has high purity and can be sold directly or used as an additive for iron removal by the sodium ferroaluminate method. In this way, the centralized treatment and reuse of zinc electrolysis acid mist is realized, solving the acid mist problem from the source.

[0024] (2) After the acid mist problem is solved, the electrolysis auxiliary equipment such as the zinc electrolysis conductive bar will not be corroded, and its conductive performance will be able to maintain stability for a longer time. It also avoids the corroded conductive head and conductive strip from entering the electrolyte to affect the zinc electrolysis process and the quality of the zinc sheet. The on-site production environment will also be greatly improved, and the impact on the occupational health and safety of employees in a relatively closed place will be relatively small.

[0025] (3) After the filter bag is placed on the anode plate, the anode mud generated during the zinc electrolysis process will not enter the cathode, nor will it adhere to the ion membrane, which provides support for extending the service life of the ion membrane and maintaining the high conductivity of the ion membrane. When the anode plate cleaning cycle comes, the anode mud in the filter bag can be directly cleaned out.

[0026] (4) After the anode plate is covered with a filter bag, if the anode frame ion membrane is damaged, the influence of the anode on zinc electrolysis will be reduced to a minimum.

[0027] (5) The solution in the anode frame can be the same as the cathode solution, or dilute sulfuric acid can be used. This can reduce the output of anode mud and improve the conductivity of the solution, thereby reducing the voltage of the zinc electrolytic cell and ultimately reducing the DC power consumption of zinc electrolysis.

[0028] (6) After the anode plate is covered with a filter bag, it is placed in a diaphragm frame composed of an anion membrane. Each anode has an independent liquid inlet and outlet, while the cathode has a unified liquid inlet. Under the condition that the quality of the new liquid is reliable, the zinc produced by this process is of high and stable quality.

[0029] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0031] Figure 1 It is a structural diagram shown in an embodiment of the present application;

[0032] Figure 2 Schematic diagram of the electrolytic cell structure shown in the embodiment of the present application;

[0033] Figure 3 is an enlarged schematic diagram of point A shown in an embodiment of the present application;

[0034] Reference numerals:

[0035] 1. Electrolytic cell; 2. Cathode plate; 3. Anode plate; 4. Cathode chamber; 5. Wastewater reaction chamber; 6. Anode chamber; 7. Cation exchange membrane; 8. First anion exchange membrane; 9. Air outlet; 10. Induced draft fan; 11. Water inlet and outlet; 12. DC power supply; 13. Filter bag; 14. Anode frame; 15. Exhaust port; 16. Bracket. DETAILED DESCRIPTION

[0036] The following describes embodiments of the present application in more detail with reference to the accompanying drawings. Although the accompanying drawings illustrate embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0037] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0039] Unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0040] In response to the above problems, an embodiment of the present application provides an apparatus and method for the coordinated preparation of high-quality zinc by treating zinc electrolytic acid mist. The technical solution of the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0041] The cathode of the zinc electrolysis process mainly deposits zinc, while the anode mainly releases oxygen through water decomposition. Because the zinc electrolyte contains an acid content of 150-200g / L, the acid mist that escapes with the oxygen is highly corrosive, endangering the occupational safety of employees on the job. In the past, surfactants such as soapberry powder were sprinkled on the surface of the electrolyte to suppress the generation of acid mist. However, with the adoption of new processes such as large-plate long-cycle and automatic zinc stripping, the added organic matter such as soapberry powder has an adverse effect on the zinc electrolysis current efficiency, zinc sheet quality, and zinc sheet peeling processes. Therefore, most companies adopt enhanced ventilation and air exchange to reduce the impact of acid mist. However, with the strengthening of zinc electrolysis process management, the impact of acid mist on conductive copper busbars and the production environment has gradually become important. How to effectively deal with the acid mist in the electrolysis process has become a consensus in the zinc electrolysis industry. At the same time, when dealing with acid mist, it is also necessary to balance the quality of the zinc sheets and solve the problem of lead dissolved on the anode mud and the anode lead-silver alloy plate entering the electrolyte. Based on this, the application provides the following embodiments.

[0042] like Figure 1 、 Figure 2 and Figure 3 The device and method for coordinating the production of high-quality zinc by electrolytic acid mist treatment are shown, wherein the device for coordinating the production of high-quality zinc by electrolytic acid mist treatment includes an electrolytic cell 1), a cathode plate 2, an anode plate 3, a cation exchange membrane 7, a first anion exchange membrane 8, and a DC power supply 12;

[0043] The electrolytic cell 1 is provided with a water inlet and outlet 11, in which a cathode plate 2 and an anode plate 3 are arranged and electrically connected to a DC power supply 12. The improvement of the present application is the introduction of an induced draft fan 10, a filter bag 13, and an anode frame 14; an exhaust port 15 is provided on the anode frame 14;

[0044] A cation exchange membrane 7 and a first anion exchange membrane 8 are vertically arranged parallel to each other within an electrolytic cell 1, dividing the cell 1 into a cathode chamber 4, a wastewater reaction chamber 5, and an anode chamber 6. Air outlets 9 are located at the tops of the cathode chamber 4, wastewater reaction chamber 5, and anode chamber 6, connected to an induced draft fan 10 via pipes. A filter bag 13 is placed over the anode plate 3, and an anode frame 14 is placed over the filter bag 13. This prevents anode mud produced during the electrolysis process from entering the electrolyte, ensuring that impurity ions such as lead generated at the anode enter the cathode and anode mud enters the electrolyte. At the same time, the acid mist is absorbed by the water after passing through the fan to produce dilute sulfuric acid, which is returned to the zinc system for use. The resulting sodium sulfate is of high purity and can be sold directly or used as an additive for iron removal using the sodium ferroalite method. This achieves centralized treatment and reuse of zinc electrolysis acid mist, addressing the acid mist problem at its source. After the acid mist problem is solved, electrolysis auxiliary equipment such as zinc electrolysis conductive bars will not be corroded, and their conductive performance will be able to maintain stability for a longer time. It also prevents corroded conductive heads and conductive strips from entering the electrolyte and affecting the zinc electrolysis process and zinc sheet quality. The on-site production environment will also be greatly improved, and the impact on the occupational health and safety of employees in relatively closed places will be smaller.

[0045] In the present application, the cation exchange membrane 7 and the first anion exchange membrane are vertically arranged parallel to each other in the electrolytic cell 1 and divide the electrolytic cell 1 into a cathode chamber 4, a wastewater reaction chamber 5, and an anode chamber 6 that are isolated from each other; the cathode plate 2 can be adjusted forward and backward and vertically arranged in the cathode chamber 4 near the side of the cation exchange membrane 7, and the anode plate 3 can be adjusted forward and backward and vertically arranged in the anode chamber 6 near the side of the first anion exchange membrane 8, the cathode plate 2 and the anode plate 3 are respectively electrically connected to the power port of the DC power supply 12, and the cathode plate and the anode plate are respectively electrically connected to the power port of the DC power supply, the cathode plate 2 is a titanium mesh and is electrically connected to the negative electrode port of the DC power supply 12, the anode plate 3 is a titanium ruthenium-iridium-plated or titanium iridium-tantalum-plated mesh and is electrically connected to the positive electrode port of the DC power supply 12, the cathode plate 2 and the anode plate 3 exist in pairs, and obviously, the number of cathode plates 2 and anode plates 3 can be appropriately increased.

[0046] In the present application, the anode frame 14 is composed of an ion membrane, which is a Class II anion exchange membrane. During the zinc electrolysis process, the exhaust port 15 is located above the electrolyte level, and the anode mud produced during the electrolysis process does not enter the electrolyte. This allows impurity ions such as lead produced at the anode to enter the cathode and the anode mud to enter the electrolyte. Anions can normally pass through the Class II anion exchange membrane to conduct electricity, while the lead dissolved in the anode plate cannot pass through the membrane and enter the cathode accessories, which will not affect the quality of the zinc sheet. After the anode plate is covered with a filter bag, the anode mud produced during the zinc electrolysis process will not enter the cathode or adhere to the ion membrane, providing support for extending the service life of the ion membrane and maintaining the high conductivity of the ion membrane. During the anode plate cleaning cycle, the anode mud can be directly cleaned out of the filter bag. After the anode plate is covered with a filter bag, if the anode frame ion membrane is damaged, the impact of the anode on zinc electrolysis will be minimized. The solution in the anode frame can be the same as the cathode solution, or dilute sulfuric acid can be used. This reduces anode mud production and improves the solution's conductivity, lowering the zinc electrolytic cell voltage and ultimately reducing the DC power consumption of zinc electrolysis. By enclosing the anode plates in filter bags and placing them in a diaphragm frame composed of anionic membranes, each anode has independent liquid inlet and outlet, while the cathode has a unified liquid inlet. This process produces high-quality and stable zinc, provided the quality of the new liquid is reliable.

[0047] In the present application, the water inlet and outlet 11 are respectively arranged at the upper and lower parts of the cathode chamber 4 and the anode chamber 6. The cathode chamber 4 and the anode chamber 6 are respectively connected to the external circulation pipe and circulation pump through the water inlet and outlet to form a circulation loop to facilitate circulation.

[0048] In the present application, the filter bag 13 is made of acid-resistant materials such as PP and polypropylene. The filter bag can filter the anode mud but is not easy to cause the acid mist gas to leak.

[0049] This application uses the above-mentioned equipment to treat acid mist and prepare zinc. The specific method steps are as follows:

[0050] S1. Equipment preparation: Put a filter bag 13 on the outside of the anode plate 3, put an anode frame 14 on the outside of the filter bag 13, place the first anion exchange membrane 8 on one side of the anode frame 14, and place a cation exchange membrane 7 on one side of the cathode plate 2. Fix the cathode plate 2 and the anode plate 3 to the electrolytic cell 1 and adjust their positions to form a cathode chamber 4, a wastewater reaction chamber 5, and an anode chamber 6 that are isolated from each other. Electrically connect the cathode plate 2 and the anode plate 3 to the power port of the DC power supply 12 respectively, and then connect the cathode chamber 4 and the anode chamber 6 to the external circulation pipe and circulation pump through their respective water inlet and outlet 11 to form a circulation loop. At the same time, the preset air outlet 9 of the cathode chamber 4, the wastewater reaction chamber 5, and the anode chamber 6 are connected to the induced draft fan 10 through pipelines;

[0051] S2. Electrolyte preparation: Add predetermined amounts of electrolyte and dilute sulfuric acid into the prepared cathode chamber 4 and anode chamber 6, respectively;

[0052] S3, electrolysis: Start the DC power supply 12 to power the cathode plate 2 and the anode plate 3 for electrolysis, and at the same time start the circulation pump connecting the cathode chamber 4 and the anode chamber 6, so that the electrolyte in the cathode chamber 4 and the anode chamber 6 form an internal circulation respectively. At the same time, the gas generated by electrolysis is removed from the gas outlet 9 of each chamber to the induced draft fan 10, and the tail gas is absorbed by water and alkali solution to produce dilute sulfuric acid and sodium sulfate solution.

[0053] The filter bag 13 is made of acid-resistant materials such as PP and polypropylene, and its air permeability is specifically selected to be 15, 20 or 25 liters / square meter / min.

[0054] The main components of the electrolyte in the electrolyte preparation step are H2SO4 145-155g / L, Zn 40-50g / L, Mg18-25g / L, Mn 4-8g / L, and Na 2-4g / L; the impurity content is Co<0.5mg / L, Cd<0.5mg / L, Cu<0.2mg / L, As<0.01mg / L, Sb<0.01mg / L, Ge<0.05mg / L, Fe<10mg / L, Se<5mg / L, Te<0.5mg / L, and Pb<0.2mg / L.

[0055] In a specific embodiment, the cathode is a pure aluminum plate with an effective cathode area of 60 cm2, and the anode is two lead-silver alloy plates. Two anode plates are placed in three sets of filter bags 13 and then placed in two anode frames 14 respectively. Then, a dilute sulfuric acid solution containing 150 g / L of sulfuric acid is added to the anode frame 14; an electrolyte containing 140 g / L of sulfuric acid, 40 g / L of zinc, and 6.2 g / L of manganese is added to the electrolytic cell where the cathode plate 2 is located, and the amount of gelatin used is 2.3 kg / tZn; a cathode aluminum plate is placed in the electrolytic cell, the distance between the cathode and anode is controlled to be 50 mm, the same pole distance of the anode is 10 mm, the current density is controlled to be 400 A / m2, the electrolyte flow rate is 4 L / h, the sulfuric acid flow rate in the anode frame is 1 L / h, the electrolysis is carried out for 24 hours, the cathode zinc sheet mass is 64.29 g, the current efficiency is 91.49%, the DC power consumption is 3363.2 kw·h / t·Zn, and the impurity components in the zinc sheet are shown in Table 1.

[0056] Table 1 Impurity content of zinc flakes (%)

[0057] Cu Pb Fe Sn Al total 0.0002 0.00026 0.0004 0.0001 0.0008 0.00176

[0058] The zinc content in the zinc flakes is >99.997%, and the content of impurity elements meets the quality requirements of standard GB / T470 2008.

[0059] As a specific technical solution of this embodiment, the cathode is a pure aluminum plate with an effective cathode area of 60 cm2, and the anode is two lead-silver alloy plates. The two anode plates are placed in three sets of filter bags 13 and then placed in two anode frames 14 respectively. Then, an electrolyte containing 148 g / L of sulfuric acid, 36 g / L of zinc, and 5.8 g / L of manganese is added to the anode frame 14; an electrolyte containing 140 g / L of sulfuric acid, 40 g / L of zinc, and 6.2 g / L of manganese is added to the electrolytic cell where the cathode plate 2 is located, and the amount of gelatin used is 2.3 kg / tZn. A cathode aluminum plate was placed in the electrolytic cell. The distance between the cathode and anode was controlled to be 50 mm, the anode co-electrode distance was 10 mm, the current density was controlled to be 400 A / m2, the electrolyte flow rate was 4 L / h, the sulfuric acid flow rate in the anode frame was 1 L / h, and the electrolysis was carried out for 24 h. The cathode zinc sheet had a mass of 63.87 g, a current efficiency of 90.89%, and a DC power consumption of 3519.1 kw·h / t·Zn. The impurity components in the zinc sheet are shown in Table 2.

[0060] Table 2 Impurity content of zinc flakes (%)

[0061] Cu Pb Fe Sn Al total 0.0001 0.00032 0.0004 0.0002 0.0009 0.00192

[0062] The zinc content in the zinc flakes is >99.997%, and the content of impurity elements meets the quality requirements of standard GB / T470 2008.

[0063] Finally, it should be noted that, in this document, relationships such as first and second, etc., are used solely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms include, comprise, or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0064] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0065] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A device for synergistically preparing high-quality zinc by treating zinc electrolytic acid mist, comprising an electrolytic cell (1), a cathode plate (2), an anode plate (3), a cation exchange membrane (7), a first anion exchange membrane (8), and a DC power supply (12); The electrolytic cell (1) is provided with a water inlet and outlet (11), a cathode plate (2) and an anode plate (3) which are electrically connected to a DC power supply (12); the electrolytic cell is characterized in that: Also includes: An induced draft fan (10), a filter bag (13), and an anode frame (14); an exhaust port (15) is configured on the anode frame (14); The cation exchange membrane (7) and the first anion exchange membrane (8) are vertically arranged in parallel with each other in the electrolytic cell (1) and divide the electrolytic cell (1) into a cathode chamber (4), a wastewater reaction chamber (5), and an anode chamber (6) which are isolated from each other; an air outlet (9) is provided at the top of the cathode chamber (4), the wastewater reaction chamber (5), and the anode chamber (6) and is connected to an induced draft fan (10) through a pipeline; a filter bag (13) is provided on the anode plate (3), and an anode frame (14) is provided outside the filter bag (13).

2. The device for coordinating the production of high-quality zinc by treating zinc electrolytic acid mist according to claim 1, characterized in that: The anode frame (14) is a frame composed of an ion membrane, and the ion membrane is a type II anion exchange membrane.

3. The device for synergistically preparing high-quality zinc by treating zinc electrolytic acid mist according to claim 1, characterized in that: The water inlet and outlet (11) are respectively arranged at the upper part and the lower part of the cathode chamber (4) and the anode chamber (6); the cathode chamber (4) and the anode chamber (6) are respectively connected to an external circulation pipe and a circulation pump through the water inlet and outlet to form a circulation loop.

4. The device for synergistically preparing high-quality zinc by treating zinc electrolytic acid mist according to claim 1, characterized in that: The filter cloth bag (13) is made of PP or polypropylene, and has an air permeability of 10-30 liters / square meter / min.

5. The device for synergistically preparing high-quality zinc by treating zinc electrolytic acid mist according to claim 1, characterized in that: A water washing tank is provided on one side of the electrolytic cell (1), and the gas sucked by the induced draft fan (10) is washed with water in the water washing tank and then discharged.

6. The device for coordinating the production of high-quality zinc by treating zinc electrolytic acid mist according to claim 1, characterized in that: The exhaust port (15) is located above the liquid level of the electrolyte.

7. A method for acid mist treatment and zinc production using the apparatus for zinc electrolysis acid mist treatment and coordinated production of high-quality zinc as claimed in any one of claims 1 to 6, characterized in that: The specific steps include: S1. Equipment preparation: a filter bag (13) is placed on the outside of the anode plate (3), an anode frame (14) is placed on the outside of the filter bag (13), a first anion exchange membrane (8) is placed on one side of the anode frame (14), a cation exchange membrane (7) is placed on one side of the cathode plate (2), the cathode plate (2) and the anode plate (3) are respectively fixed on the electrolytic cell (1) and adjusted to form a cathode chamber (4), a wastewater reaction chamber (5), and an anode chamber (6) which are isolated from each other, the cathode plate (2) and the anode plate (3) are respectively electrically connected to the power supply port of the DC power supply (12), and then the cathode chamber (4) and the anode chamber (6) are respectively connected to the external circulation pipe and the circulation pump through their respective water inlet and outlet (11) to form a circulation loop, and at the same time, the preset air outlets (9) of the cathode chamber (4), the wastewater reaction chamber (5), and the anode chamber (6) are connected to the induced draft fan (10) through the pipeline; S2. Preparation of electrolyte: Add predetermined amounts of electrolyte and dilute sulfuric acid into the prepared cathode chamber (4) and anode chamber (6), respectively; S3, electrolysis: Start the DC power supply (12) to supply power to the cathode plate (2) and the anode plate (3) for electrolysis, and simultaneously start the circulation pumps connected to the cathode chamber (4) and the anode chamber (6), so that the electrolytes in the cathode chamber (4) and the anode chamber (6) form internal circulation, and simultaneously remove the gas generated by electrolysis from the gas outlet (9) of each chamber to the induced draft fan (10), and the tail gas is absorbed by water and alkali solution to produce dilute sulfuric acid and sodium sulfate solution.

8. The method for preparing high-quality zinc by synergistically treating zinc electrolytic acid mist according to claim 7, characterized in that: The filter cloth bag (13) is made of acid-resistant material and has an air permeability of 10-30 liters / square meter / min.

9. The method for preparing high-quality zinc by synergistically treating zinc electrolytic acid mist according to claim 7, characterized in that: In the electrolyte preparation step, the main components of the electrolyte are H2SO4 145-155g / L, Zn 40-50g / L, Mg 18-25g / L, Mn 4-8g / L, and Na 2-4g / L; the impurity content is Co<0.5mg / L, Cd<0.5mg / L, Cu<0.2mg / L, As<0.01mg / L, Sb<0.01mg / L, Ge<0.05mg / L, Fe<10mg / L, Se<5mg / L, Te<0.5mg / L, and Pb<0.2mg / L.

10. The method for preparing high-quality zinc by synergistically treating zinc electrolytic acid mist according to claim 7, 8 or 9, characterized in that: In the preparation of the electrolyte, the electrolyte and dilute sulfuric acid are added to the cathode chamber (4) and the anode chamber (6) respectively; or in the preparation of the electrolyte, the electrolyte is added to the cathode chamber (4) and the anode chamber (6) respectively.

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