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Method for separating copper and nickel from sulfuric acid solution containing copper and nickel

A technology of sulfuric acid solution and separation method, which is applied in the field of hydrometallurgy, can solve the problems of low recovery rate of copper and nickel, poor separation effect, difficult recycling, etc., and achieve the effect of low production cost, high recovery rate and good separation effect

Active Publication Date: 2015-11-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid after the crystallization of gained ammonium nickel sulfate is the mixed solution of sodium sulfate and ammonium sulfate, is difficult to recycle
In a word, the existing method for separating and recovering copper and nickel from copper-nickel-containing sulfuric acid solution has defects such as low copper-nickel recovery rate and poor separation effect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take copper electrolytic refining electrolyte 1m 3 Add ammonium sulfate according to 0.95 times of the theoretical amount of ammonium sulfate double salt formed by Cu and Ni. After pre-precipitating copper for 6 hours at 25°C, filter to obtain copper ammonium sulfate crystals and crystallized liquid. The obtained crystallized liquid is then subjected to -15 Freeze at ℃ for 16 hours, filter to obtain mixed crystals of copper nickel ammonium sulfate double salt and the solution after nickel removal, and return the solution after nickel removal to the copper electrolysis system for continued use. The obtained cupric ammonium sulfate crystals are directly sold as products. The obtained mixed crystals are added with water at a solid / liquid ratio of 1:6g / ml, stirred and dissolved at 65°C, and the cell voltage is 2.0V, and the current density is 150A / m 2 The cathode copper product with a purity of 99.992% is obtained by electrodeposition. After electrowinning, the liquid is co...

Embodiment 2

[0031]Take 1L of sulfuric acid leaching solution of copper-nickel oxide ore, add ammonium sulfate according to 1.2 times the theoretical amount of ammonium sulfate double salt formed by Cu and Ni in it, stir and cool at 15°C for 4 hours, filter to obtain mixed crystals of copper-nickel ammonium sulfate double salt and its crystallization liquid. The obtained liquid after crystallization is returned to the leaching process to continue to use; the obtained copper-nickel ammonium sulfate double salt mixed crystal is added with water at a solid / liquid ratio of 1:6g / ml and stirred and dissolved, and then calcium sulfide is added according to 1 times the stoichiometric number of copper sulfide formed by copper , so that the copper in the solution is selectively precipitated, filtered to obtain copper sulfide precipitate and its precipitated liquid, the precipitated liquid is cooled and crystallized at 15°C to precipitate nickel ammonium sulfate, filtered to obtain nickel ammonium sul...

Embodiment 3

[0035] Take 5L of the secondary decopper solution produced in the purification process of copper electrolyte, feed ammonia gas according to 0.8 times of the theoretical amount of ammonium sulfate double salt formed by Cu and Ni in it, stir at -5°C for 20h, and filter to obtain copper nickel ammonium sulfate double salt Mixed crystal and solution after nickel removal. The obtained nickel-removed solution is returned to the copper electrolysis production system for use; the obtained copper-nickel ammonium sulfate double salt mixed crystal is added with water at a solid / liquid ratio of 1:5g / ml, stirred and dissolved at 70°C; the obtained dissolved solution is used for organic phase selection with Lix984N-kerosene system To extract copper, the concentration of Lix984N in the organic phase is 12%, and the organic phase is loaded with 1.5mol / L H 4 SO 4 solution as back-extraction. The obtained copper-containing back-extraction solution is sent to the copper electrolysis production...

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Abstract

The invention provides a method for separating copper and nickel from a sulfuric acid solution containing copper and nickel. Ammonium sulfate salt or ammonia is added to the sulfuric acid solution containing copper and nickel, the copper and nickel in the sulfuric acid solution are separated out by crystallization in an ammonium sulfate double salt mode, and copper, nickel and ammonium sulfate double salt mixed crystals and liquid obtained after crystallization are obtained after filtering. The liquid obtained after crystallization is returned to the copper and nickel sulfuric acid solution preparation process for reuse. After water is added to the mixed crystals for dissolution, copper and nickel inside are separated and recycled through selective electro-deposition or selective solvent extraction or selective sulfuration, and ammonium sulfate is recycled in the technological process. The method has the advantages that the copper and nickel recovery rate is high, the separation effect is good, and the production cost is low; operation is easy and convenient, and environment friendliness is achieved; the method is suitable for industrial production applications for separating and recycling copper and nickel from the sulfuric acid solution containing copper and nickel.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, in particular to a method for separating copper and nickel in sulfuric acid solution containing copper and nickel, which is suitable for the separation and recovery of copper and nickel in sulfuric acid solution. Background technique [0002] Nickel is a common associated element in copper minerals, so copper-nickel-containing sulfuric acid solution is formed during the copper smelting process. In addition, copper-nickel-containing solid materials produced in the electroplating industry are also leached with sulfuric acid to obtain a copper-nickel-containing sulfuric acid solution. Both copper and nickel are valuable metals. At present, the methods for separating and recovering copper and nickel from sulfuric acid solution containing copper and nickel mainly include: displacement precipitation method, electrowinning method and double salt precipitation-reduction method. [0003] The replacement pre...

Claims

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Application Information

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IPC IPC(8): C22B3/22C22B3/46C22B15/00C22B23/00
CPCY02P10/20
Inventor 王学文王明玉
Owner CENT SOUTH UNIV
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