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Zinc electrodeposition system suitable for high current density

A high current density, zinc electrowinning technology, applied in the direction of electrodes, electrolytic processes, electrolytic components, etc., can solve the problems of anode corrosion intensification, achieve the effect of improving catalytic activity, improving corrosion resistance, and low silver content

Pending Publication Date: 2022-03-04
KUNMING HENDERA SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The present invention aims at the deficiencies of the zinc electrodeposition system with high current density in the prior art, and proposes a zinc electrodeposition system suitable for high current density, so as to solve the anode corrosion aggravation caused by electrodeposited zinc at high current density and the The method of reducing the current efficiency caused by the increase of concentration polarization, in order to achieve the purpose of improving production efficiency and reducing energy consumption

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  • Zinc electrodeposition system suitable for high current density
  • Zinc electrodeposition system suitable for high current density
  • Zinc electrodeposition system suitable for high current density

Examples

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Embodiment 1

[0041] Example 1: Zinc electrodeposition system suitable for high current density, zinc electrodeposition anode is modified by doping and anti-corrosion surface treatment, additives are added to the electrolyte to improve the current efficiency of zinc electrodeposition under high current density, wherein the additive is Sodium lauryl sulfate, the additive amount of sodium lauryl sulfate in the electrolyte is 0.7mg / L, and the zinc electrowinning electrolyte also contains Zn 2+ 50g / L, H 2 SO 4 150g / L, Mn 2+ 5g / L;

[0042] The specific steps of doping modification are as follows:

[0043] 1) heating and melting lead metal to form lead liquid, adding silver to the lead liquid and smelting at a temperature of 550-560°C to obtain lead-silver alloy melt;

[0044] 2) adding the dopant to the lead-silver alloy melt and melting at a temperature of 550-560°C, adding a refining agent to continue refining at a temperature of 550-560°C, removing scum, and casting to obtain a lead-silv...

Embodiment 2

[0076] Example 2: Zinc electrodeposition system suitable for high current density, zinc electrodeposition anode is modified by doping and anti-corrosion surface treatment, additives that can improve the current efficiency of zinc electrodeposition under high current density are added to the electrolyte, wherein the additive is Hexadecyltrimethylammonium bromide, the additive amount of hexadecyltrimethylammonium bromide in the electrolyte is 0.7mg / L, and the zinc electrowinning electrolyte also contains Zn 2+ 50g / L, H 2 SO 4 150g / L, Mn 2+ 5g / L;

[0077] The specific steps of doping modification are as follows:

[0078] 1) heating and melting lead metal to form lead liquid, adding silver into the lead liquid and smelting at a temperature of 600-650°C to obtain a lead-silver alloy melt;

[0079] 2) adding the dopant to the lead-silver alloy melt and melting at a temperature of 620-660°C, adding a refining agent to continue refining at a temperature of 620-660°C, removing scu...

Embodiment 3

[0105] Example 3: Zinc electrowinning system suitable for high current density, zinc electrowinning anode is modified by doping and corrosion-inhibiting surface treatment, and an additive that improves the current efficiency of zinc electrowinning at high current density is added to the electrolyte, wherein the additive is Strontium carbonate, the additive (strontium carbonate) in the electrolyte is added in an amount of 0.7mg / L, and the zinc electrowinning electrolyte also contains Zn 2+ 50g / L, H 2 SO 4 150g / L, Mn 2+ 5g / L;

[0106] The specific steps of doping modification are as follows:

[0107] 1) heating and melting lead metal to form lead liquid, adding silver to the lead liquid and smelting at a temperature of 500-550°C to obtain a lead-silver alloy melt;

[0108] 2) adding the dopant to the lead-silver alloy melt and melting at a temperature of 520-560°C, adding a refining agent to continue refining at a temperature of 520-560°C, removing scum, and casting to obtai...

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Abstract

The invention relates to a zinc electrodeposition system suitable for high current density, and belongs to the technical field of zinc hydrometallurgy. A zinc electrodeposition anode suitable for a high-current-density zinc electrodeposition system is subjected to doping modification and corrosion inhibition surface treatment, an additive capable of improving the zinc electrodeposition current efficiency under the high current density is added into electrolyte, and the additive is one or more of lauryl sodium sulfate, strontium carbonate and hexadecyl trimethyl ammonium bromide. The lead-silver alloy anode obtained through the doping technology has the advantages of being low in silver content, high in corrosion resistance and good in oxygen evolution activity, the lead-silver anode can be effectively protected through corrosion inhibition surface treatment, the low corrosion rate is shown in an accelerated corrosion experiment, meanwhile, the electrochemical performance is excellent, and the anode oxygen evolution potential is low; the additive is added into the electrolyte, so that the zinc electrodeposition current efficiency can be effectively improved, and the electrolyte is suitable for high-current-density zinc electrodeposition.

Description

technical field [0001] The invention relates to a zinc electrodeposition system suitable for high current density and belongs to the technical field of zinc hydrometallurgy. Background technique [0002] At present, zinc hydrometallurgy accounts for more than 80% of zinc smelting, and the current density of electrolytic zinc deposition is generally 400-450A / m 2 , The zinc electrolysis process of low current density electrolysis technology has high energy consumption, and the DC power consumption can reach 3000-3500kWh / t zinc, and the power consumption is huge. With the increasingly fierce competition for raw materials, the price of raw materials has risen, and the quality of zinc concentrate has decreased, resulting in the increase of impurities in the electrowinning solution, and the profit margins of smelting enterprises are getting smaller and smaller. Therefore, while ensuring production capacity, zinc quality and economic benefits, how to extract metallic zinc quickly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/16C25C7/02C22C11/00C22C1/02C23F11/14
CPCC25C1/16C25C7/02C22C11/00C23F11/149C22C1/02
Inventor 黄惠蒋春翔郭忠诚董劲陈步明
Owner KUNMING HENDERA SCI & TECH
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