Purification method of copper electrolyte

A copper electrolyte and electrolyte technology, applied in the field of metallurgy, can solve the problems of high loss, time-consuming and laborious, and poor stability of resin impurity removal by concentration method.

Inactive Publication Date: 2020-08-07
YANGGU XIANGGUANG COPPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The concentration method has high loss, time-consuming and labor-intensive, and the resin has poor stability in removing impurities

Method used

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  • Purification method of copper electrolyte
  • Purification method of copper electrolyte
  • Purification method of copper electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Take Cu 2+ Concentration is 100g / L waste copper nitrate electrolyte 40L, after heating to electrolyte temperature 35 ℃, add 500 meshes of purified copper powder (100*the amount of (As+Sb+Bi+Pb+Ag) in the solution) 464g, cycle Electrowinning was carried out after 6 hours of reaction, and the current density was controlled to be 150A / m 2 , the electrodeposition temperature is 35°C, and the electrodeposition time is 24h.

[0046] Electrolyte composition after purification in the embodiment of the present invention 1 in table 1

[0047] name Electrolyte (before electrowinning) Electrolyte (12h after electrowinning) Electrolyte (24h after electrowinning) Cu 2+ / g / L

102 90.4 81.5 HNO 3 / g / L

4.2 9.2 13.4 Ag / mg / L 5 <0.5

<0.5

As / mg / L 20 10 9.3 Sb / mg / L 15 9 8.1 Bi / mg / L 16 8 7.5 Pb / mg / L 60 40 38

[0048] Content of cathode copper element in table 2 embodiment 1 of the present invention

[00...

Embodiment 2

[0051] Take Cu 2+ 40L of copper nitrate electrolyte with a concentration of 150g / L, heated to the temperature of the electrolyte at 30°C, and then adding 579.6g of 600-mesh copper powder (the amount of (As+Sb+Bi+Pb+Ag) in the 115* solution) to control the current The density is 150A / m 2 , the electrodeposition temperature is 30°C, and the electrodeposition time is 24h.

[0052] Electrolyte composition after purification in the embodiment of the present invention 2 in table 3

[0053] name Electrolyte (before electrowinning) Electrolyte (12h after electrowinning) Electrolyte (24h after electrowinning) Cu 2+ / g / L

152 128.3 113.2 HNO 3 / g / L

8.5 14.1 18.6 Ag / mg / L 8 <0.5

<0.5

As / mg / L 22 9.8 9.0 Sb / mg / L 17 8.7 7.9 Bi / mg / L 17 7.8 7.3 Pb / mg / L 62 40 37

[0054] Content of cathode copper element in table 4 embodiment 2 of the present invention

[0055] Cu% Ag% S％ Fe% Pb% As% S...

Embodiment 3

[0057] Take Cu 2+ Two parts of 40L of copper nitrate electrolyte with a concentration of 100g / L were heated to the temperature of the electrolyte at 33°C, and copper powder of 500 mesh and 1000 mesh were added respectively (110*the amount of (As+Sb+Bi+Pb+Ag) in the solution )510.4g, the control current density is 160A / m 2 , the electrodeposition temperature is 33°C, and the electrodeposition time is 24h.

[0058] Electrolyte composition after purification in different granularity embodiments of table 5

[0059]

[0060] Cathode copper element content in different particle size embodiments of table 6

[0061]

[0062]

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Abstract

The invention provides a purification method of a copper electrolyte. The method comprises the following steps of adding copper powder into a copper nitrate electrolyte for purification and impurity removal, carrying out electrodeposition on the electrolyte after impurity removal, and taking out a cathode after electrodeposition to obtain a product 5N copper, wherein the particle size of the copper powder is 300-1000 meshes, the mass of the copper powder is 50-200 times of the total mass of As, Sb, Bi, Pb and Ag in the solution, the temperature of the copper powder-added electrolyte is 30-40 DEG C, and after the copper powder is added, electrodeposition is started after circular reaction is carried out for 4-6 h. According to the method, the copper powder is supplemented into an electrodeposition low tank, the particle size of the copper powder and the adding amount of the copper powder are strictly controlled, impurities in the copper nitrate electrolyte are effectively removed, meanwhile, the acidity of the electrolyte is controlled, and the problem of cathode micro-etching re-dissolution in the electrodeposition process is solved. Cathode copper prepared through electrolysis according to the purification method is high in purity which reaches 5N, and the method is simple, low in energy consumption and beneficial to actual industrial treatment.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for purifying copper electrolyte. Background technique [0002] Copper is one of the most widely used metals in the world. The color of pure copper is purple, the density is 8.92g / cm3, the melting point is 1083°C, and the boiling point is 2567°C. Copper has good properties such as corrosion resistance, plasticity, and ductility. High thermal conductivity and high electrical conductivity, and can form alloys with other metals. [0003] Copper smelting is roughly divided into three categories: hydrometallurgy, pyrometallurgy and electrolytic refining. [0004] Hydrometallurgical copper smelting uses sulfuric acid to convert the copper element in copper ore into soluble copper sulfate, then separates, enriches and extracts. Sulfur, iron, lead, zinc, nickel, tin, copper, and oxygen impurities in blister copper and recycled copper produce pyro-refined copper; electrolyti...

Claims

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Application Information

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IPC IPC(8): C25C1/12C25C7/06
CPCC25C1/12C25C7/06Y02P10/20
Inventor 宁万涛谢祥添赵宁宁张勇焦峰超
Owner YANGGU XIANGGUANG COPPER
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