Electrodeposition impurity removing process for 6N copper electrolyte

A copper electrolyte and electrolyte technology, applied in the field of metallurgy, can solve the problems of poor stability of impurity removal by adsorption method, high consumption of raw materials, long process flow, etc.

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

AI Technical Summary

Problems solved by technology

Electrolyte purification processes mainly include chemical precipitation, extraction, and adsorption; chemical precipitation will introduce new impurities; extraction consumes a lot of raw materials and has a long process flow; adsorption has poor stability in removing impurities

Method used

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  • Electrodeposition impurity removing process for 6N copper electrolyte
  • Electrodeposition impurity removing process for 6N copper electrolyte
  • Electrodeposition impurity removing process for 6N copper electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Take Cu 2+ 40L of 6N copper electrolyte with a concentration of 100g / L, add 650ml of hydrogen peroxide in the lower tank, pre-oxidize at 20°C for 10 hours, and control the current density at 250A / m 2 , the electrodeposition temperature is 30°C, and the electrodeposition time is 24h.

[0053] The purified electrolyte composition and black powder composition are shown in Table 1 and Table 2

[0054] Electrolyte composition after purification in the embodiment of the present invention 1 in table 1

[0055]

[0056]

[0057] The composition of black powder in the embodiment of the present invention 1 of table 2

[0058]

Embodiment 2

[0060] Take Cu 2+ 40L of copper nitrate electrolyte with a concentration of 150g / L, 1L of hydrogen peroxide was added to the lower tank, oxidation pretreatment was carried out at 30°C for 7 hours, and the current density was controlled at 550A / m 2 , the electrodeposition temperature is 30°C, and the electrodeposition time is 24h.

[0061] The purified electrolyte composition and black powder composition are shown in Table 1 and Table 2

[0062] Electrolyte composition after purification in the embodiment of the present invention 1 in table 1

[0063] name Electrolyte (before electrowinning) Electrolyte (12h after electrowinning) Electrolyte (24h after electrowinning) Pb / mg / L 108.91 45.34 19.20 As / mg / L 36.53 12.17 1.68 Sb / mg / L 28.71 9.33 0.97 Bi / mg / L 24.31 7.83 1.36

[0064] The composition of black powder in the embodiment of the present invention 1 of table 2

[0065]

Embodiment 3

[0067] Take Cu 2+ Concentrations of 50g / L and 150g / L copper nitrate electrolyte to be purified are 40L each, add 1L of hydrogen peroxide to the lower tank, pre-oxidize at 30°C for 7 hours, and control the current density to 550A / m 2 , the electrodeposition temperature is 30°C, and the electrodeposition time is 24h.

[0068] Electrolyte composition after purification in the embodiment of the present invention 3 in table 3

[0069]

[0070]

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PUM

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Abstract

The invention provides an electrodeposition impurity removing process for 6N copper electrolyte. The electrodeposition impurity removing process comprises the following steps that A) hydrogen peroxideis added into the 6N copper electrolyte to be purified, and pretreatment is carried out, wherein the adding amount of the hydrogen peroxide accounts for 0.1% to 1% of the amount of the 6N copper electrolyte; and B) a cathode and an anode are placed in the solution pretreated in the step A) for electrodeposition, filtering and impurity removing are carried out after electrodeposition, and the electrolyte obtained after impurity removing is returned to a 6N copper electrolysis system. According to the electrodeposition impurity removing process, electrodeposition is carried out in an oxidationenvironment, copper and some impurities can be separated out on the cathode to form fine black powder, the fine black powder has reducibility, arsenic, stibium, bismuth and other impurities in the 6Ncopper electrolyte can be reduced into elementary substances, and the impurities are removed through filtering; the impurity removing process is simple, actual industrial treatment is benefited, acidcan be generated in the electrodeposition process to consume copper ions, acid consumption is reduced, and meanwhile the problem that acid and copper are not balanced during impurity removal of an electrodeposition method is solved; and no new impurity is introduced in the whole impurity removing process.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to an electrowinning impurity removal process for 6N copper electrolyte. Background technique [0002] Copper is one of the most widely used metals in the world. The color of pure copper is purple-red and the density is 8.92g / cm 3 , The melting point is 1083°C, and the boiling point is 2567°C. Copper has good properties such as corrosion resistance, plasticity, and ductility. It also has high thermal conductivity and high electrical conductivity, and can also form alloys with other metals. [0003] Compared with ordinary copper, ultra-high-purity copper has many excellent properties, and can even be used to replace some high-cost metals. It is currently widely used in cutting-edge technology fields such as electronics, communications, superconductivity, and aerospace. [0004] Copper smelting is roughly divided into three categories: hydrometallurgy, pyrometallurgy and electro...

Claims

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Application Information

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IPC IPC(8): C25C1/12C25C7/06
CPCC25C1/12C25C7/06Y02P10/20
Inventor 宁万涛谢祥添焦峰超左东平赵宁宁
Owner YANGGU XIANGGUANG COPPER
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