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Copper removal method

A technology of cuprous sulfite and sodium sulfide, which is applied in the nickel electrolysis anolyte purification process and in the field of copper removal, can solve the problems of high labor intensity, unfavorable environmental protection, complicated process, etc., to reduce labor intensity, facilitate automatic control, increase The effect of reaction probability

Active Publication Date: 2014-05-28
JINCHUAN GROUP LIMITED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of nickel concentrate and anode slime is done manually, which is labor-intensive; nickel concentrate and anode slime are added every 20 to 30 minutes, the whole process fluctuates frequently, and the copper content of the solution cannot be guaranteed; the resulting waste slag contains nickel by weight As high as 20~30%, it is necessary to introduce chlorine gas to leach and recover nickel. The leaching solution is rich in high copper impurities, and it needs to be returned to the electrowinning process to produce sponge copper. The entire purification process is long and complicated, and chlorine gas is used for recovery. Nickel is also not conducive to environmental protection

Method used

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  • Copper removal method

Examples

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Effect test

Embodiment 1

[0032] A method for removing copper, the concrete steps are as follows:

[0033] a, sodium sulfide dissolved

[0034] Add tap water at a temperature of 5~25°C to the sodium sulfide dissolving tank, add a stabilizer, the volume ratio of the stabilizer to tap water is 0.18:100, stir for 10~20 minutes, add industrial sodium sulfide with a purity of 60%, and dissolve the sodium sulfide Control the concentration at 90g / l, stir for 1-1.5 hours, then add dispersant, the volume ratio of dispersant to tap water is 0.15:100, stir for 0.5-1 hour;

[0035] b. Preparation of amorphous nickel sulfide

[0036] Take another container and add the solution after copper removal, the nickel concentration in the solution after copper removal is 75g / l, the temperature is 20~40°C, the pH value is 3.2~3.6, add anhydrous sodium sulfite, stir for 0.5~1 hour, the concentration of sodium sulfite after dissolution is 0.8g / l, then add dispersant, the volume ratio of dispersant to copper solution is 0.2:1...

Embodiment 2

[0042] A method for removing copper, the concrete steps are as follows:

[0043] a, sodium sulfide dissolved

[0044] Add tap water at a temperature of 5~25°C to the sodium sulfide dissolving tank, add a stabilizer, the volume ratio of the stabilizer to tap water is 0.25:100, stir for 10~20 minutes, add industrial sodium sulfide with a purity of 60%, and dissolve the sodium sulfide Control the concentration at 120g / l, stir for 1-1.5 hours, then add dispersant, the volume ratio of dispersant to tap water is 0.2:100, stir for 0.5-1 hour;

[0045] b. Preparation of amorphous nickel sulfide

[0046] Take another container and add the solution after copper removal, the nickel concentration in the solution after copper removal is 85g / l, the temperature is 20~40°C, the pH value is 3.2~3.6, add anhydrous sodium sulfite, stir for 0.5~1 hour, the concentration of sodium sulfite after dissolution is 1g / l, then add dispersant, the volume ratio of dispersant to copper solution is 0.25:10...

Embodiment 3

[0052] A method for removing copper, the concrete steps are as follows:

[0053] a, sodium sulfide dissolved

[0054] Add tap water with a temperature of 5~25°C into the sodium sulfide dissolving tank, add a stabilizer, the volume ratio of the stabilizer to tap water is 0.2:100, stir for 10~20 minutes, add industrial sodium sulfide with a purity of 60%, and dissolve the sodium sulfide Control the concentration at 100g / l, stir for 1-1.5 hours, then add dispersant, the volume ratio of dispersant to tap water is 0.18:100, stir for 0.5-1 hour;

[0055] b. Preparation of amorphous nickel sulfide

[0056] Take another container and add the solution after copper removal, the nickel concentration in the solution after copper removal is 80g / l, the temperature is 20~40°C, the pH value is 3.2~3.6, add anhydrous sodium sulfite, stir for 0.5~1 hour, the concentration of sodium sulfite after dissolution is 0.9g / l, then add dispersant, the volume ratio of dispersant to copper solution is 0...

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Abstract

The invention relates to a chemical purification method, especially to a copper removal method which is suitable for a nickel electrolysis anolyte purification process. The copper removal method provided by the invention is obviously different from a copper removal method by adding anode mud in nickel ore concentrate as follows: a sodium hydrosulphite solution is added in an iron-removed liquid to activate copper ions and increase reaction probability between copper ions and amorphous nickel sulfide; as amorphous nickel sulfide is added into a copper removal tank in a slurry form, labor intensity is reduced, it is convenient to realize automatic control, and stabilization and continuity of the copper removal process are guaranteed; and as copper slag can directly enter a copper melting system, the technology is optimized, flow of copper impurity in the system is shortened, copper slag is processed not by the use of chlorine, and the environment is improved. Through detection, a copper-removed liquid contains 0.4-2.5ppm of copper. Thus, purification requirements are met. The mass ratio of copper to nickel in the copper slag is 15-17. The copper slag can be directly melted to produce anode plates.

Description

technical field [0001] The invention relates to a chemical purification method, in particular to a method for removing copper, which is suitable for the purification process of nickel electrolysis anolyte. Background technique [0002] At present, the copper removal method of nickel concentrate plus anode slime is widely used in the nickel electrolysis production process. The method is mainly to add nickel concentrate and anode slime into the copper removal tank according to the weight ratio of 3.5~4:1 to carry out the copper removal reaction. The amount of nickel concentrate added is 110~140kg / t. The addition of nickel concentrate and anode slime is done manually, which is labor-intensive; nickel concentrate and anode slime are added every 20 to 30 minutes, the whole process fluctuates frequently, and the copper content of the solution cannot be guaranteed; the resulting waste slag contains nickel by weight As high as 20~30%, it is necessary to introduce chlorine gas to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/08C25C7/06
Inventor 陈自江郭勇郑军福赵重卢建波王得祥孙渊君宛顺磊翟惠明王立成
Owner JINCHUAN GROUP LIMITED
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