Method for treating purification copper-removing slag of nickel electrolysis anode solution

A technology of anolyte and nickel electrolysis, which is applied in the field of copper-nickel hydrometallurgy, can solve the problems of low copper-nickel ratio, and achieve the effect of easy control and operation, and easy operation

Inactive Publication Date: 2012-04-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the ratio of copper to nickel in the copper removal slag is extremely low due to the excessive addition of copper removal agent in the copper removal process of nickel thiocarbonate, and proposes to further process the copper removal slag to reduce the nickel content to obtain copper nickel electrode High method of removing copper slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] First adjust the pH value of the nickel electrolysis anolyte to 4; add excess nickel thiocarbonate to react with the copper in the solution, control the reaction temperature to 90° C., and the reaction time to 60 minutes to obtain copper removal slag. Add 10Kg of copper removal slag with a copper-nickel ratio of 0.5 to 84 liters of CuSO with a pH of 5.0 and a copper concentration of 80g / L 4 In the solution, the molar ratio of nickel in the copper-removing slag to copper in the copper-containing solution is 0.7, and the reaction temperature is controlled at 25° C. After 120 minutes of reaction, the copper-nickel ratio of 151 is separated to obtain the copper-removing slag, and the nickel concentration is 52.7g / L, NiSO with a copper concentration of 0.33g / L 4 solution. Then 5.8Kg of Na 2 Dissolve S in 70L of water first, then add 4.7L of CS 2 solution, after 10 hours of reaction, 74mol of Na 2 CS 3 solution. with NiSO 4 Solution reaction to prepare nickel thiocarb...

Embodiment 2

[0056] Decopper slag produces with embodiment 1, and the copper removal slag that 10Kg copper-nickel ratio is 1 is added to 80 liters of pH is 7.0, and copper concentration is 60g / L to contain CuSO 4 and Cu 2 SO 4 In the mixed solution, the molar ratio of nickel in the copper-removing slag to copper in the copper-containing solution is 0.8, and the controlled reaction temperature is 50°C. After 80 minutes of reaction, the copper-nickel ratio of 200 is separated to obtain the copper-removing slag, and the nickel concentration is 34.6g / L, NiSO with a copper concentration of 0.002g / L 4 solution. Then 3.58Kg of Na 2 Dissolve S in 50L of water first, then add 5.55L of CS 2 solution, after 10 hours of reaction, 46mol of Na 2 C 2 S 5 solution. with NiSO 4 Solution reaction to prepare nickel thiocarbonate; then react with nickel electrolytic anolyte containing 43mol copper and pH 4.2 at 20°C to remove copper. After copper removal, the copper concentration is 1.1mg / L, and the ...

Embodiment 3

[0058] Decopper slag produces with embodiment 1, and 10Kg copper-nickel ratio is the copper removal slag of 1.5 and joins 54 liters of pH and is 2.5, and copper concentration is the CuCl of 52g / L 2 In the solution, the molar ratio of nickel in the copper-removing slag to copper in the copper-containing solution is 1.0, and the reaction temperature is controlled at 90°C. After 60 minutes of reaction, the copper-nickel ratio of 178 is separated to obtain the copper-removing slag, and the nickel concentration is 36.9g / L, NiCl with a copper concentration of 0.67g / L 2 solution. Then 3.63Kg of K 2 Dissolve S in 50L of water first, then add 3.98L of CS 2 solution, after 20 hours of reaction, 33mol of K 2 C 2 S 5 solution. with NiCl 2 Solution reaction to prepare nickel thiocarbonate; then react with nickel electrolytic anolyte containing 32mol copper and pH 6.0 at 90°C to remove copper. After copper removal, the copper concentration is 0.98 mg / L, and the copper-nickel ratio i...

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Abstract

The invention discloses a method for treating the purification copper-removing slag of a nickel electrolysis anode solution. The method comprises the following steps: treating the copper-removing slag generated in the nickel thiocarbonate method copper-removing process with a copper-containing solution to leach nickel in the copper-removing slag, obtain copper-removing slag of which copper-nickel ratio is above 150 and convert the leachate to a nickel-containing solution, then using the nickel-containing solution to react with a thiocarbonate solution and prepare nickel thiocarbonate, and using the prepared nickel thiocarbonate to remove copper in the nickel electrolysis anode solution. In the copper-removing process, only copper in the nickel electrolysis anode solution is required to be removed completely without considering the copper-nickel ratio of the copper-removing slag. A lot of copper-removing agent is added to ensure that even the highest concentration of copper in the solution can be removed completely. Therefore, the copper concentration of the solution is not required to be accurately controlled before the copper-removing process and the operations are performed easily. Meanwhile, a lot of copper-removing agent is added and the copper-removing solution with extremely lower copper concentration can be obtained, compared with the copper-removing effect by adding a defined amount of the copper-removing agent. As whether nickel exceeds the standard is not considered, the copper-removing operation can be easily controlled.

Description

technical field [0001] The invention relates to the field of copper-nickel hydrometallurgy, in particular to a technical method for separating copper-nickel from nickel electrolysis anolyte to purify and remove copper slag. Background technique [0002] my country's electro-nickel standard (GB / T 6516-1997 Ni9996) has very strict requirements on impurity content, especially the content of impurity copper is less than 0.01%. However, since copper and nickel are elements with very similar chemical properties, the deep removal of copper in the anolyte of nickel electrolysis has become a long-term problem that has plagued the metallurgical circles at home and abroad. In response to this problem, my country has listed this research as a key research project twice in the "Eighth Five-Year Plan" and "Ninth Five-Year Plan", hoping to develop a new copper removal process. On the one hand, the copper content is reduced to meet the production requirements, on the other hand, the ratio ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00
CPCY02P10/20
Inventor 陈星宇赵中伟何利华陈爱良
Owner CENT SOUTH UNIV
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