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A method for purifying copper electrolyte by two removals and two accumulations

A copper electrolyte solution and a technology for purifying copper, applied in the field of copper electrolytic refining, can solve problems such as the generation of toxic hydrogen arsenide gas, poor impurity open circuit, poor working environment, etc., and achieve the effects of good arsenic removal, improved environmental protection, and increased income.

Active Publication Date: 2020-07-31
YANGGU XIANGGUANG COPPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has copper and arsenic indistinguishability, poor open circuit of impurities, and arsine hydrogen (AsH 3 ) Toxic gas production, poor working environment and many other disadvantages

Method used

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  • A method for purifying copper electrolyte by two removals and two accumulations
  • A method for purifying copper electrolyte by two removals and two accumulations
  • A method for purifying copper electrolyte by two removals and two accumulations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) One-stage electrowinning copper removal

[0050] The electrolytic solution containing 47.02g / L of copper that needs to be purified (see Table 1 for composition) is pumped to the first section of the front liquid cylinder, and the electrolyte in the first section of the front liquid cylinder is heated to 65°C by plate exchange, and then given to the bottom of the first section of electrowinning tank. Liquid, single-end liquid return for one stage of decopper, after one stage of copper removal, the liquid pumps to a stage of impurity removal process. When the concentration of copper ions in the solution drops from 47.02g / L to 30.2g / L after a period of copper removal, the electrowinning is stopped and the cathode produces A-grade copper.

[0051] Wherein, the process parameters of the first stage of electrowinning copper removal include: the number of slots for each group of cathode plates is 280; the current is 13000A; the current intensity is 280A / m 2 ; The electric...

Embodiment 2

[0072] (1) One-stage electrowinning copper removal

[0073] The electrolytic solution containing 48.20g / L of copper that needs to be purified (see Table 5 for composition) is pumped to the first section of the front liquid cylinder, and the electrolyte in the first section of the front liquid cylinder is heated to 65°C by plate exchange, and then given to the bottom of the first section of electrowinning tank. Liquid, single-end liquid return for one stage of decopper, after one stage of copper removal, the liquid pumps to a stage of impurity removal process. When the concentration of liquid copper ions drops from 48.20g / L to 29.82g / L after a period of copper removal, the electrowinning is stopped and the cathode produces A-grade copper.

[0074] Wherein, the process parameters of the first stage of electrowinning copper removal include: the number of slots for each group of cathode plates is 280; the current is 13000A; the current intensity is 280A / m 2 ; The electric efficie...

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Abstract

The invention provides a method for purifying a copper electrolyte through two-stage decoppering and two-stage electrodeposition. The method comprises the following steps that S1, first-stage electrodeposition decoppering is carried out on a to-be-purified copper electrolyte of which the concentration of cooper ions is greater than 42 g / L, so that the concentration of the cooper ions is reduced to29-35 g / L, and A-grade copper and a first-stage decoppered liquid are obtained respectively; S2, first-stage impurity removal is carried out on the first-stage decoppered liquid by adopting an arsenic precipitating agent, the arsenic precipitating agent is an antimony hydroxide hydrate, and first-stage impurity removal slag and a first-stage liquid after impurity removal are obtained respectively; S3, second-stage impurity removal is carried out on the first-stage liquid after impurity removal, so that the concentration of antimony and bismuth is reduced, and a second-stage liquid after impurity removal is obtained; S4, second-stage electrodeposition decoppering is carried out on the second-stage liquid after impurity removal, and a second-stage decoppered liquid of which the concentration of A-grade copper and copper ions is less than 25 g / L is obtained respectively. The method for purifying the copper electrolyte through the two-stage decoppering and two-stage electrodeposition hasthe advantages that it can be ensured that the quality of electro-deposited copper meets an A-class copper standard, the generation of arsenic hydride is avoided, the working environment is better, the impurity removal energy consumption is low, and the running cost is low.

Description

technical field [0001] The invention belongs to the technical field of copper electrolytic refining, and in particular relates to a method for purifying electrolytic solution by two removals and two accumulations. Background technique [0002] In the copper electrolytic refining process, the electrolyte used is mainly copper sulfate solution containing free sulfuric acid. The electrolyte usually contains impurities, and the chemical potential of impurities such as arsenic (As), antimony (Sb) and bismuth (Bi) is very close to that of copper, and they are continuously enriched in the electrolyte. If the concentration of these impurities in the electrolyte exceeds a certain limit, it will cause serious harm to the production of cathode copper. In order to ensure the normal progress of the electrolysis process, the electrolyte must be purified and adjusted. [0003] At present, the induction method is mainly used to remove copper and impurities. This process removes copper, ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/12C22B7/00C22B30/04C22B30/02C22B30/06C22B15/14
CPCC22B7/006C22B15/0063C22B30/02C22B30/04C22B30/06C25C1/12Y02P10/20
Inventor 张化刚宁万涛谢祥添冯芝勇余华清梁源田仁光左东平王虎韩义忠
Owner YANGGU XIANGGUANG COPPER
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