A device for intensifying zinc electrodeposition by magnetic field

Abstract

This invention discloses a magnetic field-enhanced zinc electrowinning apparatus. The anode is a carbon-coated ferrite-modified Pb-Sn-Ca / α-PbO2 / PbO2-carbon-coated ferrite composite anode. Multiple permanent magnets are integrated within the electrolytic cell, arranged with alternating N and S poles. The magnetic field lines are parallel to the electrolytic anode and cathode, ensuring the Lorentz force is perpendicularly downwards. The magnetic field strength is 1-5T. This apparatus, by integrating permanent magnets and matching soft magnetic anodes within the electrolytic cell, fully utilizes the role of the magnetic field in electrochemistry, including magnetocaloric, magnetohydrodynamic, Maxwellian stress, Kelvin, and selective effects. This improves the high oxygen evolution overpotential in zinc electrowinning, achieving optimal energy savings. Simultaneously, it alleviates severe concentration polarization and excessive floating anode sludge, thereby enhancing the zinc electrowinning process, reducing energy consumption, and stabilizing product quality. This application in the field of zinc electrowinning is unprecedented.

Description

Technical Field

[0001] This invention relates to the field of zinc electrowinning technology, and more specifically to a device for magnetic field-enhanced zinc electrowinning. Background Technology

[0002] In the field of hydrometallurgical zinc refining, the zinc electrowinning section has long suffered from problems such as excessively high power consumption per ton of zinc (3000-3200 kWh / t), excessive impurities in cathode products, severe dendrite formation in cathodes, and low current efficiency (-88%). The main reasons are: (1) The oxygen evolution reaction at the anode is a four-electron transfer process controlled by slow kinetics, while the oxygen evolution catalytic activity of the Pb-Ag alloy anode is poor and has a high oxygen evolution overpotential; (2) A small amount of lead at the anode is easily dissolved and deposited at the cathode; (3) The anode has low mechanical strength and is easy to bend, causing short circuits; (4) The inherent concentration polarization in the electrochemical process leads to severe dendrite formation in the zinc products at the cathode.

[0003] Magnetic fields, as a physical field, often play unexpected roles in other fields. In electrochemistry, the application of a magnetic field mainly results in magnetocaloric, magnetohydrodynamic, Maxwell stress, Kelvin, and spin selectivity effects. Among these, the magnetocaloric effect is generated by an external high-frequency alternating magnetic field acting on magnetic nanoparticles (MNPs), exhibiting thermal localization. The magnetohydrodynamic effect is caused by macroscopic and microscopic convection resulting from the interaction between the magnetic field and local current density (driven by the Lorentz force). The Maxwell stress effect is caused by the interaction between the magnetic field and the dipole moment; the magnetic field source stress causes magnetostriction of the shape of paramagnetic droplets. The Kelvin effect is that the magnetic field gradient force accelerates mass transfer in paramagnetic materials and can drive convection, thinning the diffusion layer, increasing the limiting current, and improving the reaction rate near the electrode. The spin selectivity effect is that the magnetic field can induce spin flipping of intermediates adsorbed on the surface of magnetic catalysts, optimizing the reaction pathway and improving reaction efficiency.

[0004] Regarding the application of magnetic fields in zinc electrowinning, Chinese patent application CN111676490A discloses a method for optimizing the zinc electrowinning process, proposing to add a magnetic field at the electrolyte inlet pipe of the electrolytic cell to reduce the thickness of Zn by magnetizing the electrolyte. 2+ The thickness of the chemical hydration layer with other positive and negative ions increases H. + Co 2+ Ca 2+ Mg 2+The thickness of the hydration layer with paramagnetic ions is increased, thereby reducing the cell voltage, decreasing the formation of calcium sulfate and magnesium sulfate, and alleviating the burning and remelting of the zinc cathode. However, CN111676490A can only pre-magnetize the electrolyte to change its properties, while the high oxygen evolution overpotential at the anode during electrodeposition is the biggest challenge in terms of high energy consumption. CN111676490A cannot effectively improve the oxygen evolution problem during electrodeposition. In addition, CN111676490A uses a non-magnetic Pb-Ag alloy anode. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention aims to provide a device for magnetic field-enhanced zinc electrowinning.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A device for magnetic field-enhanced zinc electrowinning includes an electrolytic cell containing an anode and a cathode. The anode is a carbon-coated ferrite-modified Pb-Sn-Ca / α-PbO2 / PbO2-carbon-coated ferrite composite anode. Multiple permanent magnets are integrated within the electrolytic cell, arranged with alternating N and S poles. The magnetic field lines are parallel to the anode and cathode, causing the Lorentz force to be perpendicularly downwards. The magnetic field strength is 1-5T.

[0008] The Pb-Sn-Ca / α-PbO2 / PbO2-carbon-coated ferrite composite anode was prepared by the following process:

[0009] Preparation of carbon-coated ferrate powder: Ferrate was ultra-finely ground to obtain ferrate powder; the ultra-finely ground ferrate powder was added to glucose solution and ultrasonically dispersed, then poured into a reaction vessel and subjected to hydrothermal reaction at 180℃. After the reaction was completed, the powder was centrifuged and finally calcined at 600℃ under a nitrogen protective atmosphere with a heating rate of 5℃ / min to obtain carbon-coated ferrate powder.

[0010] Preparation of Pb-Sn-Ca / α-PbO2: The Pb-Sn-Ca alloy was polished to a bright finish with sandpaper, then immersed in acetone, anhydrous ethanol, and deionized water for ultrasonic treatment. Using the obtained Pb-Sn-Ca alloy as the anode and stainless steel as the cathode, plating was performed in an electroplating solution containing 170 g / L NaOH and saturated PbO at a temperature of 40℃ and a current density of 60 mA / cm². 2 Electroplating was performed under the specified conditions to obtain Pb-Sn-Ca / α-PbO2;

[0011] Preparation of Pb-Sn-Ca / α-PbO2 / PbO2-carbon-coated ferrite composite anode: An electrolyte containing 250 g / L lead nitrate, 20 g / L nitric acid, and 5 g / L carbon-coated ferrite powder was prepared. After ultrasonication to ensure thorough dispersion, Pb-Sn-Ca / α-PbO2 was used as the anode and stainless steel as the cathode. The anode was then subjected to an electrolyte solution at a current density of 20 mA / cm². 2 Electroplating was performed at a temperature of 30℃ to obtain a Pb-Sn-Ca / α-PbO2 / PbO2-carbon-coated ferrite composite anode.

[0012] Furthermore, the carbon-coated ferrite is one of carbon-coated zinc ferrite, carbon-coated cobalt ferrite, and carbon-coated manganese ferrite.

[0013] Furthermore, the outer wall of the electrolytic cell is integrated with a circulating cooling water device.

[0014] Furthermore, the device also includes a zinc electrolytic solution storage tank, the zinc electrolytic solution outlet of the electrolytic cell is connected to the zinc electrolytic solution inlet of the zinc electrolytic solution storage tank, and the zinc electrolytic solution outlet of the zinc electrolytic solution storage tank is connected to the zinc electrolytic solution inlet of the electrolytic cell; a filter is provided on the pipeline connecting the zinc electrolytic solution outlet of the zinc electrolytic solution storage tank to the zinc electrolytic solution inlet of the electrolytic cell.

[0015] Furthermore, valves, power pumps, and flow meters are installed on both the pipeline connecting the zinc electrolytic liquid outlet of the electrolytic cell to the zinc electrolytic liquid inlet of the zinc electrolytic liquid storage tank and the pipeline connecting the zinc electrolytic liquid outlet of the zinc electrolytic liquid storage tank to the zinc electrolytic liquid inlet of the electrolytic cell.

[0016] Furthermore, the device also includes a new liquid storage tank, the new liquid outlet of which is connected to the zinc electrolytic liquid inlet of the zinc electrolytic liquid storage tank; a valve, a power pump, and a flow meter are installed on the pipeline connecting the new liquid outlet of the new liquid storage tank to the zinc electrolytic liquid inlet of the zinc electrolytic liquid storage tank.

[0017] Furthermore, the device also includes a zinc electrolytic electrolyte buffer tank, the waste zinc electrolytic electrolyte inlet of which is connected to the waste zinc electrolytic electrolyte outlet of the electrolytic cell; a valve, a power pump, and a flow meter are installed on the pipeline connecting the waste zinc electrolytic electrolyte inlet of the zinc electrolytic electrolyte buffer tank to the waste zinc electrolytic electrolyte outlet of the electrolytic cell.

[0018] The beneficial effects of this invention are as follows:

[0019] (1) In this invention, a soft magnetic anode is used. Under the action of Lorentz force, the bubbles can quickly detach from the anode surface and reduce the interface resistance. The presence of the magnetic field can induce the spin flipping of the intermediate adsorbed on the surface of the magnetic anode, optimize the reaction path, change the oxygen evolution kinetic conditions, and improve the oxygen evolution efficiency. At the same time, the magnetic field can achieve local heating of the surface of the magnetic anode, increase the number of active sites, promote oxygen evolution, and avoid the problem of excessive overall temperature and severe hydrogen evolution at the cathode.

[0020] (2) In this invention, permanent magnets are integrated in the electrolytic cell, so that during the electrowinning process, ions are simultaneously subjected to a vertically downward Lorentz force and a magnetic field gradient force with the magnetic field lines aligned with the direction. Under the action of the Lorentz force, the settling of floating anode mud in the electrowinning solution is accelerated, the electrowinning solution is purified, and the electrowinning process conditions are more stable. Under the combined action of the Lorentz force and the magnetic field gradient force, the magnetohydrodynamic convection near the cathode is intensified, the cathode diffusion layer thickness is reduced, the concentration polarization is reduced, and the diffusion of zinc ions is promoted, thereby improving the efficiency of zinc electrowinning.

[0021] The device of this invention integrates permanent magnets and matching soft magnetic anodes in an electrolytic cell, giving full play to the role of magnetic fields in electrochemistry, including magnetocaloric effect, magnetohydrodynamic effect, Maxwell stress effect, Kelvin effect, and selective effect. This improves the problem of high oxygen evolution overpotential in zinc electrowinning, achieving optimal energy saving. At the same time, it also improves the problems of severe concentration polarization and excessive floating anode mud, thereby strengthening the zinc electrowinning process and achieving the goals of reducing energy consumption and stabilizing product quality. This application in the field of zinc electrowinning is unprecedented. Attached Figure Description

[0022] Figure 1 This is a connection diagram of the device in Embodiment 1 of the present invention;

[0023] Figure 2 This is a schematic diagram of the cathode zinc product obtained by electrowinning in Embodiment 1 of the present invention;

[0024] Figure 3 This is a schematic diagram of the cathode zinc product obtained by electrowinning in Comparative Example 1 of the present invention;

[0025] Figure 4 This is a schematic diagram of the cathode zinc product obtained by electrowinning in Comparative Example 2 of the present invention. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings. It should be noted that this embodiment is based on the present technical solution and provides detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to this embodiment.

[0027] Example 1

[0028] This embodiment provides a device for magnetic field-enhanced zinc electrowinning, such as... Figure 1 As shown, the device includes an electrolytic cell 10, which contains an anode and a cathode. The anode is a carbon-coated ferrite-modified Pb-Sn-Ca / α-PbO2 / PbO2-carbon-coated ferrite composite anode. The electrolytic cell 10 integrates multiple permanent magnets, which are arranged with alternating N and S poles. The magnetic field lines are parallel to the electrolytic anode and the electrolytic cathode, so that the Lorentz force is perpendicularly downward and the magnetic field strength is 2T.

[0029] The Pb-Sn-Ca / α-PbO2 / PbO2-carbon-coated ferrite composite anode was prepared by the following process:

[0030] Preparation of carbon-coated zinc ferrite powder (ZnFe2O4@C): Zinc ferrite was ultra-finely ground to obtain zinc ferrite powder with an average particle size of about 5 μm; 10 g of the ultra-finely ground zinc ferrite powder was added to 900 ml of glucose solution and ultrasonicated for 30 min to fully disperse it. Then, it was poured into a reaction vessel and hydrothermally reacted at 180℃ for 3 h. After the reaction was completed, it was centrifuged and finally calcined at 600℃ for 8 h under a nitrogen protective atmosphere with a heating rate of 5℃ / min to obtain carbon-coated zinc ferrite powder.

[0031] Preparation of Pb-Sn-Ca / α-PbO2: The Pb-Sn-Ca alloy was polished to a bright finish with sandpaper, then immersed in acetone, anhydrous ethanol, and deionized water for ultrasonic treatment. Using the obtained Pb-Sn-Ca alloy as the anode and stainless steel as the cathode, plating was performed in an electroplating solution containing 170 g / L NaOH and saturated PbO at a temperature of 40℃ and a current density of 60 mA / cm². 2 Electroplating was performed under the specified conditions for 3 hours to obtain Pb-Sn-Ca / α-PbO2;

[0032] Preparation of Pb-Sn-Ca / α-PbO2 / PbO2-carbon-coated zinc ferrite composite anode: An electrolyte containing 250 g / L lead nitrate, 20 g / L nitric acid, and 5 g / L carbon-coated zinc ferrite powder was prepared. After sonication for 30 min, Pb-Sn-Ca / α-PbO2 was used as the anode and stainless steel as the cathode. The anode was then subjected to an electrolyte solution at a current density of 20 mA / cm². 2 Electroplating was performed at 30℃ for 3 hours to obtain a Pb-Sn-Ca / α-PbO2 / PbO2-carbon-coated zinc ferrite composite anode.

[0033] In this embodiment, a circulating cooling water device is integrated into the outer wall of the electrolytic cell 10. The circulating cooling water device is used to maintain the cell temperature at around 35°C to prevent the cell temperature from rising during electrowinning, which could lead to abnormal electrowinning indicators.

[0034] Furthermore, the device also includes a zinc electrolytic electrolyte storage tank 4, the zinc electrolytic electrolyte outlet of the electrolytic cell 10 is connected to the zinc electrolytic electrolyte inlet of the zinc electrolytic electrolyte storage tank 4, and the zinc electrolytic electrolyte outlet of the zinc electrolytic electrolyte storage tank 4 is connected to the zinc electrolytic electrolyte inlet of the electrolytic cell 10; a filter 7 is provided on the pipeline connecting the zinc electrolytic electrolyte outlet of the zinc electrolytic electrolyte storage tank 4 to the zinc electrolytic electrolyte inlet of the electrolytic cell 10.

[0035] Furthermore, in this embodiment, a power pump 2, a valve 3, and a flow meter 1 are provided on the pipeline connecting the zinc electrolytic liquid outlet of the electrolytic cell 10 to the zinc electrolytic liquid inlet of the zinc electrolytic liquid storage tank 4. Valves 5, power pumps 6 and 8, and a flow meter 9 are provided on the pipeline connecting the zinc electrolytic liquid outlet of the zinc electrolytic liquid storage tank 4 to the zinc electrolytic liquid inlet of the electrolytic cell 10.

[0036] Furthermore, in this embodiment, the device further includes a new electrolyte storage tank 18, the new electrolyte outlet of the new electrolyte storage tank 18 being connected to the zinc electrolytic electrolyte inlet of the zinc electrolytic electrolyte storage tank 4; a valve 17, a power pump 16, and a flow meter 15 are provided on the pipeline connecting the new electrolyte outlet of the new electrolyte storage tank 18 to the zinc electrolytic electrolyte inlet of the zinc electrolytic electrolyte storage tank 4.

[0037] Furthermore, in this embodiment, the device further includes a zinc electrolytic electrolyte buffer tank 14, the waste zinc electrolytic electrolyte inlet of the zinc electrolytic electrolyte buffer tank 14 being connected to the waste zinc electrolytic electrolyte outlet of the electrolytic cell 10; a valve 11, a power pump 12, and a flow meter 13 are installed on the pipeline connecting the waste zinc electrolytic electrolyte inlet of the zinc electrolytic electrolyte buffer tank 14 to the waste zinc electrolytic electrolyte outlet of the electrolytic cell 10.

[0038] During zinc electrowinning, the electrolytic cell is filled with winning solution, zinc electrowinning begins, and the temperature is maintained at 35℃ with a current density of 50 mA / cm². 2 When the zinc ion concentration drops below 60 g / L, valves 5, 11, and 3 are opened, and the electrolyte in electrolytic cell 10 flows simultaneously into zinc electrolyte buffer tank 14 and zinc electrolyte storage tank 4. Meanwhile, the electrolyte in zinc electrolyte storage tank 4 flows into electrolytic cell 10 after being filtered by filter 7, thus increasing the inlet flow rate of the electrolytic cell to V. 流量计9 =11L / min, the flow rate of the waste liquid from the electrolytic cell is: V 流量计1 =10*V 流量计13 =10L / min. Simultaneously open valve 17, and new electrolyte flows at a rate of V. 流量计15 =Inject 1L / min of zinc electrolytic solution into the zinc electrolytic solution storage tank 4, maintaining a circulation volume ratio of 1:10.

[0039] Comparative Example 1

[0040] The electrolytic cell structure in this comparative example is basically the same as that in Example 1. The soft magnetic anode matched to electrolytic cell 10 is a Pb-Sn-Ca / α-PbO2 / PbO2-ZnFe2O4@C composite anode modified with carbon-coated zinc ferrite (ZnFe2O4@C). The preparation process is the same as in Example 1. The difference is that the electrolytic cell in this comparative example does not integrate a permanent magnet. Zinc electrowinning is performed directly without the action of a magnetic field at a temperature of 35°C and a current density of 50 mA / cm². 2 Once the zinc ion concentration drops below 60 g / L, open valves 5, 11, and 3 to increase the inlet flow rate of the electrolytic cell to V. 流量计9 =11L / min, the flow rate of the waste liquid from the electrolytic cell is: V 流量计1 =10*V 流量计13 =10L / min. Simultaneously open valve 17, and the new liquid flows at a rate of V. 流量计15 =Inject 1L / min of zinc electrolytic solution into the zinc electrolytic solution storage tank 4, maintaining a circulation volume ratio of 1:10.

[0041] Comparative Example 2

[0042] In this comparative example, the electrolytic cell structure is basically the same as in Example 1, except that a Pb-0.8%Ag alloy is used as the electrodeposition anode. The magnetic field strength of the magnetic field-enhanced electrolytic cell is 2T. The electrolytic cell is filled with electrodeposition solution, and zinc electrodeposition begins at a temperature of 35°C and a current density of 50 mA / cm². 2 Once the zinc ion concentration drops below 60 g / L, open valves 5, 11, and 3 to increase the inlet flow rate of the electrolytic cell to V. 流量计9 =11L / min, the flow rate of the waste liquid from the electrolytic cell is: V 流量计1 =10*V 流量计13 =10L / min. Simultaneously open valve 17, and the new liquid flows at a rate of V. 流量计15 =Inject 1L / min of zinc electrolytic solution into the zinc electrolytic solution storage tank 4, maintaining a circulation volume ratio of 1:10.

[0043] The cathode zinc products obtained by electrodeposition in Example 1 and Comparative Examples 1-2 are as follows: Figure 2 , Figure 3 and Figure 4 As shown in Table 1, the key process parameters are as follows.

[0044] Table 1

[0045] type Slot voltage (V) Current efficiency (%) Energy consumption (kWh / t) Product purity (%) Example 1 3.04 91.84 2713.49 99.99 Comparative Example 1 3.19 89.62 2917.91 99.83 Comparative Example 2 3.23 89.96 2943.34 99.89

[0046] The comparison shows that in Example 1, when magnetic field enhancement and a magnetic anode are used in combination, the zinc cathode product is the densest and smoothest. At this point, the cell voltage is the lowest, the current efficiency is the highest, the theoretical power consumption per ton of zinc is 2713.49 kWh / t, and the product purity is 99.99%. When there is no magnetic field enhancement and only a magnetic anode is used, many pores appear on the zinc cathode, possibly due to hydrogen evolution at the cathode. The cell voltage increases, the current efficiency decreases, the power consumption per ton of zinc increases to 2917.91 kWh / t, and the product purity decreases to 99.83%. When there is magnetic field enhancement but a non-magnetic anode (Pb-0.8%Ag) is used, many bulges appear on the surface of the zinc cathode, making the surface rough. The overall power consumption increases to 2943.34 kWh / t, and the purity is 99.89%. Therefore, it can be seen that the device described in Example 1 can improve the current efficiency of zinc electrowinning, reduce the cell voltage, effectively achieve energy saving and consumption reduction, and stabilize product quality.

[0047] For those skilled in the art, various corresponding changes and modifications can be made based on the above technical solutions and concepts, and all such changes and modifications should be included within the protection scope of the claims of this invention.

Claims

1. An apparatus for magnetic field-enhanced zinc electrowinning, comprising an electrolytic cell, wherein an anode and a cathode are disposed within the electrolytic cell, characterized in that, The anode is a carbon-coated ferrite-modified Pb-Sn-Ca / α-PbO2 / PbO2-carbon-coated ferrite composite anode; the electrolytic cell integrates multiple permanent magnets, each permanent magnet is arranged with alternating N and S poles, the magnetic field lines are parallel to the electrolytic anode and electrolytic cathode, so that the Lorentz force is perpendicularly downward, and the magnetic field strength is 1-5T. The Pb-Sn-Ca / α-PbO2 / PbO2-carbon-coated ferrite composite anode was prepared by the following process: Preparation of carbon-coated ferrate powder: Ferrate was ultra-finely ground to obtain ferrate powder; the ultra-finely ground ferrate powder was added to glucose solution and ultrasonically dispersed, then poured into a reaction vessel and subjected to hydrothermal reaction at 180℃. After the reaction was completed, the powder was centrifuged and finally calcined at 600℃ under a nitrogen protective atmosphere with a heating rate of 5℃ / min to obtain carbon-coated ferrate powder. Preparation of Pb-Sn-Ca / α-PbO2: The Pb-Sn-Ca alloy was polished to a bright finish with sandpaper, then immersed in acetone, anhydrous ethanol, and deionized water for ultrasonic treatment. Using the obtained Pb-Sn-Ca alloy as the anode and stainless steel as the cathode, plating was performed in an electroplating solution containing 170 g / L NaOH and saturated PbO at a temperature of 40℃ and a current density of 60 mA / cm². 2 Electroplating was performed under the specified conditions to obtain Pb-Sn-Ca / α-PbO2; Preparation of Pb-Sn-Ca / α-PbO2 / PbO2-carbon-coated ferrite composite anode: An electrolyte containing 250 g / L lead nitrate, 20 g / L nitric acid, and 5 g / L carbon-coated ferrite powder was prepared. After ultrasonication to ensure thorough dispersion, Pb-Sn-Ca / α-PbO2 was used as the anode and stainless steel as the cathode. The anode was then subjected to an electrolyte solution at a current density of 20 mA / cm². 2 Electroplating was performed at a temperature of 30℃ to obtain a Pb-Sn-Ca / α-PbO2 / PbO2-carbon-coated ferrite composite anode.

2. The apparatus according to claim 1, characterized in that, The carbon-coated ferrite is one of carbon-coated zinc ferrite, carbon-coated cobalt ferrite, and carbon-coated manganese ferrite.

3. The apparatus according to claim 1, characterized in that, The outer wall of the electrolytic cell is integrated with a circulating cooling water device.

4. The apparatus according to claim 1, characterized in that, It also includes a zinc electrolytic electrolyte storage tank, the zinc electrolytic electrolyte outlet of the electrolytic cell is connected to the zinc electrolytic electrolyte inlet of the zinc electrolytic electrolyte storage tank, and the zinc electrolytic electrolyte outlet of the zinc electrolytic electrolyte storage tank is connected to the zinc electrolytic electrolyte inlet of the electrolytic cell; a filter is installed on the pipeline connecting the zinc electrolytic electrolyte outlet of the zinc electrolytic electrolyte storage tank to the zinc electrolytic electrolyte inlet of the electrolytic cell.

5. The apparatus according to claim 4, characterized in that, Valves, power pumps, and flow meters are installed on the pipeline connecting the zinc electrolytic liquid outlet of the electrolytic cell to the zinc electrolytic liquid inlet of the zinc electrolytic liquid storage tank, and on the pipeline connecting the zinc electrolytic liquid outlet of the zinc electrolytic liquid storage tank to the zinc electrolytic liquid inlet of the electrolytic cell.

6. The apparatus according to claim 4, characterized in that, It also includes a new liquid storage tank, the new liquid outlet of which is connected to the zinc electrolytic liquid inlet of the zinc electrolytic liquid storage tank; a valve, a power pump and a flow meter are installed on the pipeline connecting the new liquid outlet of the new liquid storage tank to the zinc electrolytic liquid inlet of the zinc electrolytic liquid storage tank.

7. The apparatus according to claim 4, characterized in that, It also includes a zinc electrolytic electrolyte buffer tank, the waste zinc electrolytic electrolyte inlet of which is connected to the waste zinc electrolytic electrolyte outlet of the electrolytic cell; valves, a power pump and a flow meter are installed on the pipeline connecting the waste zinc electrolytic electrolyte inlet of the zinc electrolytic electrolyte buffer tank to the waste zinc electrolytic electrolyte outlet of the electrolytic cell.

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