Preprocessing method of lead/lead-alloy inert anode for zinc electrowinning

An inert anode and pretreatment technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of cathode zinc products not meeting the standard of 0# zinc, reducing production efficiency and cutting strength, etc., which is beneficial to industrial application. , The effect of reducing the output rate and suppressing the falling off

Inactive Publication Date: 2012-05-23
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Since the new lead-based anode is directly electrolyzed in the zinc electrowinning solution according to the electrowinning process, it takes 3 to 6 months to form a dense, stable, and well-bonded protective layer on the surface, so in the initial 3 to 6 months Not only will the cathode zinc product fail to reach the standard of 0# zinc, but it will also significantly reduce production efficiency and increase the strength of the cut

Method used

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  • Preprocessing method of lead/lead-alloy inert anode for zinc electrowinning
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  • Preprocessing method of lead/lead-alloy inert anode for zinc electrowinning

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Embodiment 1

[0033] The composition of the pretreatment liquid of the present embodiment and the pretreatment process parameters are shown in Table 3

[0034] The pretreatment liquid composition of table 3 embodiment 1 and pretreatment process parameter

[0035]

[0036] figure 2 It is the cross-sectional morphology of the lead-silver inert anode after pretreatment in this embodiment. The lead or lead alloy inert anode treated by the invention forms a dense transition layer of fluorine-containing products on the surface of the anode, thereby effectively suppressing the phenomenon that the anode slime is easy to fall off from the surface of the anode. The anode treated by this method has good corrosion resistance, and has obvious effects on reducing the zinc impurity lead content in the cathode and improving production efficiency.

[0037] The anode treated by this anode pretreatment process was used as the anode of electrolytic zinc. After 12 weeks (the anode was cleaned and cut at t...

Embodiment 2

[0042] The composition of the pretreatment solution and the parameters of the pretreatment process in this embodiment are shown in Table 5.

[0043] The pretreatment liquid composition of table 5 embodiment 2 and pretreatment process parameter

[0044]

[0045] The anode treated by this anode pretreatment process was used as the anode of electrolytic zinc. After 12 weeks (among which the anode was cleaned and cut at the sixth weekend), the average lead content in the cathode zinc per week is shown in Table 6.

[0046] Table 6 Weekly average and 12-week total average (ppm) of lead content in cathode zinc products

[0047]

[0048] It can be seen from Table 6 that except that the lead content of cathode zinc in the first week did not reach the standard of 0# zinc, the rest of the period was lower than the 0# zinc standard of 20ppm. When anode cleaning and gouging are performed, the lead content of the cathode zinc stabilizes at around 5ppm.

Embodiment 3

[0050] The pretreatment liquid composition and pretreatment process parameters of this embodiment are shown in Table 7.

[0051] The pretreatment liquid composition of table 7 embodiment 3 and pretreatment process parameter

[0052]

[0053] The anode treated by this anode pretreatment process was used as the anode of electrolytic zinc. After 12 weeks (the anode was cleaned and cut at the end of the 9th week), the average lead content in the cathode zinc per week is shown in Table 8.

[0054] Table 8 Weekly average and 12-week total average (ppm) of lead content in cathode zinc products

[0055]

[0056] It can be seen from Table 8 that except that the lead content of cathode zinc in the first week did not reach the standard of 0# zinc, the rest of the period was lower than the 0# zinc standard of 20ppm. When anode cleaning and gouging are performed, the lead content of the cathode zinc stabilizes at around 10ppm.

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Abstract

The invention relates to a processing method of an lead/lead-alloy inert anode for zinc electrowinning, wherein a preprocessing solution consists of fluorides, sulfuric acid, MnSO4 and distilled water, and the temperature of the preprocessing temperature is 20-80 DEG C; the anode is an anode to be preprocessed, a cathode is a lead/lead-alloy electrode, a distance between the cathode and the anode is 3-6cm, and the circulation amount of the preprocessing solution is 0.05-0.5V tank/h, wherein V tank refers to volume of a preprocessing tank; and the preprocessing process parameters are as follows: the anode current density is 200-800A/m<2>, and the preprocessing time is 8-24h. According to the invention, the preprocessing solution containing fluorine ions is adopted, preprocessing process parameters are optimized, and the preprocessing process is simple and convenient to operation and is beneficial to industrial application. According to the preprocessing method disclosed by the invention, a period of forming a stable protection layer of the lead/lead-alloy anode for zinc electrowinning is shortened to be within 7 days from 3-6 months.

Description

technical field [0001] The invention relates to a pretreatment method of lead or lead alloy inert anode for electrolytic zinc, which is used to improve the stability of lead or lead alloy inert anode for electrolytic zinc. #The inert anode matching technology of zinc production time belongs to the technical field of inert anode matching for electrochemical metallurgy. Background technique [0002] The present invention is related to the pretreatment of lead or lead alloy inert anodes for electrolytic deposition of zinc, which is the process with the highest power consumption in the hydrometallurgical process of zinc smelting. The process flow of zinc hydrometallurgy is: zinc ore → roasting → leaching → purification → electrowinning → melting and casting → finished product. The zinc electrowinning process refers to passing direct current between the cathode and anode immersed in the strong acid zinc sulfate electrolyte. During this process, the zinc sulfate electrolyte decom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/16C25C7/02
Inventor 袁学韬吴健辉李义兵吕旭东华志强王磊
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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