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Method for extracting nickel from copper electrolysis effluent

A technology for copper electrolysis and waste liquid, which is applied in the field of nickel extraction from copper electrolysis waste liquid, can solve the problems of high power consumption, slow evaporation rate, high labor intensity, etc., and achieves low power consumption, low production cost, and no steam consumption. Effect

Inactive Publication Date: 2014-04-16
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrothermal evaporation method has the advantages of high automation and high nickel removal efficiency, but it has high power consumption, low capacity, high environmental protection investment and operating costs, and its application is limited.
The freeze crystallization method has not been widely used due to factors such as requiring a lot of equipment, occupying a large area, and low nickel removal efficiency.
The direct fire concentration method has the advantages of simple equipment and high nickel direct recovery rate, and was once widely used in small copper smelters. Large and other shortcomings
Steam indirect heating and concentration uses steam indirect heating to evaporate the solution. Due to the high acid content of the solution and serious corrosion, the requirements for vacuum evaporation materials are high. The enamel reaction kettle is used, which has the characteristics of high temperature resistance and high acid, but its heat transfer efficiency is low. Low crystallization rate, low direct nickel recovery rate, slow evaporation rate, more suitable for factories with small processing capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Put the waste copper electrolyte into the electrowinning tank, and carry out decopper electrowinning until the electrowinning final solution contains less than 0.5g / l of copper, more than 250g / l of acid, and more than 10g / l of nickel; The high-acid nickel solution enters the salt diffusion dialysis membrane separator to separate the acid and nickel salt, and the recovered acid and nickel solution are produced. The recovery rate of acid is ≥ 80%, and the rejection rate of nickel is ≥ 90%. The recovered acid can be recycled and used. Used in the electrolysis process; the recovered nickel solution is added to the reactor, and the solution processing capacity is ≥ 3m 3 / h; After the conventional reaction finishes, the product is crude nickel sulfate crystals.

Embodiment 2

[0018] Put the waste copper electrolyte into the electrowinning tank, and carry out decopper electrowinning until the electrowinning final solution contains less than 0.5g / l of copper, more than 250g / l of acid, and more than 10g / l of nickel; The high-acid nickel solution enters the salt diffusion dialysis membrane separator to separate the acid and nickel salt, and the recovered acid and nickel solution are produced. The recovery rate of acid is ≥ 80%, and the rejection rate of nickel is ≥ 90%. The recovered acid can be recycled and used. Used in the electrolysis process; the recovered nickel solution is added to the reactor, and the solution processing capacity is ≥ 3m 3 / h; After the conventional reaction finishes, the product is crude nickel sulfate crystals.

Embodiment 3

[0020] Put the waste copper electrolyte into the electrowinning tank, and carry out decopper electrowinning until the electrowinning final solution contains less than 0.5g / l of copper, more than 250g / l of acid, and more than 10g / l of nickel; The high-acid nickel solution enters the salt diffusion dialysis membrane separator to separate the acid and nickel salt, and the recovered acid and nickel solution are produced. The recovery rate of acid is ≥ 80%, and the rejection rate of nickel is ≥ 90%. The recovered acid can be recycled and used. Used in the electrolysis process; the recovered nickel solution is added to the reactor, and the solution processing capacity is ≥ 3m 3 / h; After the conventional reaction, green crude nickel sulfate crystals will be produced, containing 20% ​​to 23% nickel, with good physical appearance.

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PUM

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Abstract

The invention relates to a method for extracting nickel from a copper electrolysis effluent and relates to a method for comprehensively treating the copper electrolysis effluent. The method is characterized by comprising the extraction steps as follows: (1) copper removal is performed on the copper electrolysis effluent through electrowinning; (2) the copper removal end solution is subjected to acid and nickel salt separation to produce a recovered acid liquor and a recovered nickel liquor; (3), the recovered acid liquid obtained in the step (2) is returned to an electrolysis system, and the recovered nickel liquor is subjected to crude nickel sulfate production. The method is strong in nickel removal treatment capacity, the whole production process is closed, acid fog is not generated, and the environment protection is achieved; except the running of a pump, other electricity consumption does not exist, and the production cost is low; the product is a green nickel sulfate crystal with better physical appearance, and has stable quality.

Description

technical field [0001] A method for extracting nickel from copper electrolysis waste liquid relates to a comprehensive treatment method for copper electrolysis waste liquid. technical background [0002] At present, the methods of purifying and removing nickel in copper electrolyte mainly use crystallization method, extraction method and ion exchange method. Most domestic manufacturers use crystallization methods to produce crude nickel sulfate, mainly electrothermal evaporation method, freeze crystallization method, steam indirect heating concentration, direct fire concentration method, immersion combustion evaporator to produce crude nickel sulfate, etc. The electrothermal evaporation method has the advantages of high degree of automation and high nickel removal efficiency, but its application is limited due to high power consumption, low capacity, high environmental protection investment and operating costs. The freeze crystallization method has not been widely used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/00
CPCY02P10/20
Inventor 张素霞岳占斌程永红蒲彦雄郑宏方清天李精兵李保华包能远高军季婷朱杰孙全军潘从南
Owner JINCHUAN GROUP LIMITED
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