Method for extracting nickel sulfate from waste solution of copper electrolysis

A nickel sulfate and copper electrolysis technology, applied in the direction of nickel sulfate, etc., can solve the problems of low nickel sulfate extraction rate, waste liquid splashing and dehydration, serious equipment corrosion, etc., and achieve the advantages of environmental protection, stable product quality, and less loss of sulfuric acid Effect

Inactive Publication Date: 2007-10-10
广东金雁工业集团有限公司
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the methods for extracting nickel sulfate are: 1. Freezing method: it requires that the content of nickel sulfate in the copper electrolysis waste liquid is higher, and the solubility of nickel sulfate is reduced by reducing the temperature of the copper electrolysis waste liquid. 1.0-1.6%, thus precipitates nickel sulfate crystals; however, because the solubility of nickel sulfate is less affected by temperature changes, the extraction rate of nickel sulfate is relatively low, generally 60-65%
2. Direct fire method: heating directly with an open flame. When the concentration of free acid in the copper electrolytic waste liquid reaches 60%, the phenomenon of waste liquid splashing and dehydration will occur. A large amount of evaporated gas with a small amount of acid mist will affect the surrounding environment and affect the environment. Safe operation, and the equipment is severely corroded and has a short lifespan, generally 3 to 6 months. This method is rarely used at present

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The waste liquid discharged from the electrolytic cell is firstly subjected to electrowinning to remove copper, and the qualified standard cathode copper is first extracted; when Cu in the waste liquid 2+ When it drops to 25g / L, carry out secondary decopper, so that the Cu in the waste liquid 2+ 0.1g / L, the purpose is to recover copper and reduce the copper content in nickel sulfate. Add 1200L waste liquid after decopper removal to a reaction tank with a rated volume of 1500L, turn on the agitator, and the speed of the agitator is 25 rpm, and at the same time, steam is introduced, and the steam pressure is 0.3Mpa. At the same time, the vacuum pump is turned on, and the reaction tank is vacuumed. 0.05Mpa, and gradually make the temperature of the waste liquid in the reaction tank reach 120°C. When the temperature of the waste liquid is 100°C, observe the change of the amount of waste liquid in the reaction tank. If the stirring paddle is partly exposed to the liquid sur...

Embodiment 2

[0015] The waste liquid discharged from the electrolytic cell is firstly subjected to electrowinning to remove copper, and the qualified standard cathode copper is first extracted; when Cu in the waste liquid 2+ When it drops to 25g / L, carry out secondary decopper, so that the Cu in the waste liquid 2+ 0.1g / L, the purpose is to recover copper and reduce the copper content in nickel sulfate. Add 1050L of waste liquid after decoppering to a reaction tank with a rated volume of 1500L, turn on the agitator, the speed of the agitator is 20 rpm, and feed steam at the same time, the steam pressure is 0.1Mpa, and turn on the vacuum pump at the same time, vacuumize the reaction tank, and the negative pressure is 0.01Mpa, and gradually make the temperature of the waste liquid in the reaction tank reach 120°C. When the temperature of the waste liquid is 100°C, observe the change of the amount of waste liquid in the reaction tank. If the stirring paddle is partly exposed to the liquid su...

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Abstract

This invention relates to a method for extracting nickel sulfate from waste copper electrolyte. The method comprises: (1) removing copper from waste copper electrolyte discharged from the electrobath so that the Cu2+ content is less than or equal to 0.1 g / L; (2) adding the waste electrolyte into a reaction tank (70-80 vol.% of the tank), stirring at 20-25 rpm, introducing 0.1-0.3 MPa steam, and vacuumizing to 0.01-0.05 MPa; (3) ending heating and vacuumizing when the negative pressure in the tank reaches 0.05 MPa and the temperature reaches 120 deg.C, cooling to 60 deg.C and discharging the waste electrolyte; (4) standing, cooling to 30 deg.C, performing solid-liquid separation, discharging the upper layer, and dehydrating the sediment to obtain nickel sulfate crystal. The method has such advantages as safe operation, little pollution, high efficiency, high nickel sulfate recovery rate (98%), and stable product quality.

Description

technical field [0001] The invention relates to a method for extracting nickel sulfate from copper electrolysis waste liquid. Background technique [0002] Nickel sulfate is extracted from copper electrolysis waste liquid by heating and evaporating the water in the waste liquid to increase the concentration of free acid in the waste liquid and reduce the solubility of nickel sulfate in the waste liquid; by cooling down and standing still, nickel sulfate crystals and free acid Separation to obtain nickel sulfate crystals. Usually, the methods for extracting nickel sulfate are: 1. Freezing method: it requires that the content of nickel sulfate in the copper electrolysis waste liquid is higher, and the solubility of nickel sulfate is reduced by reducing the temperature of the copper electrolysis waste liquid. 1.0-1.6%, thus precipitates nickel sulfate crystals; however, because the solubility of nickel sulfate is less affected by temperature changes, the extraction rate of nic...

Claims

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Application Information

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IPC IPC(8): C01G53/10
Inventor 李志坚谢平康邱绍文刘小鸳董志杰陈宇杰
Owner 广东金雁工业集团有限公司
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