Method for wet separation of mixed solution containing nickel and zinc

A mixed solution, wet separation technology, applied in the direction of improving process efficiency, can solve the problems of insufficient separation of nickel and zinc, low production efficiency, unfavorable hydrogen reduction, etc., and achieves low processing cost, simple equipment, and easy large-scale production. Effect

Inactive Publication Date: 2010-05-26
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1) The neutralization method and concentrated sulfuric acid concentration crystallization method are not enough to effectively separate nickel and zinc
[0004] 2) The electrowinning method is only suitable for removing trace amounts of nickel from zinc sulfate solution
[0005] 3) Solvent extraction and ion exchange methods are commonly used in industry to purify zinc in nickel electrolysis anolyte, but these two methods are only suitable for separating trace amounts of zinc in nickel sulfate solution
Therefore, using extraction and ion exchange to separate nickel and zinc, the production efficiency is low
[0006] 4) The hydrogen reduction method requires a higher pH value to increase the precipitation voltage of nickel, which will cause the hydrolysis of metal ions to generate Ni(OH) 2 Precipitation is not conducive to hydrogen reduction, and complexing agents such as NH need to be added at this time 3 , so that it forms complexes with metal ions that are relatively stable at high pH values, which is uneconomical in sulfuric acid systems
And the reprocessing of sulfide waste residue, whether it is calcination or acid hydrolysis, has secondary pollution problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 100g zinc-containing waste nickel alloy is leached in 800mL hydrochloric acid (15wt%) medium, obtains zinc-nickel mixed solution, the pH value that adds appropriate 1: 1 ammoniacal liquor adjustment solution is 6.25, and the zinc in the solution is made of zinc hydroxide and Zn(OH ) 1.6 Cl 0.4 Precipitated in the form of , the white precipitate was separated by filtration, and the filter cake was dried to obtain 65.62 g of the zinc precipitate; the filtrate was the nickel ammonia complex solution.

Embodiment 2

[0022] 100g of zinc-containing waste nickel alloy is oxidized and leached in 800mL of ammonium chloride-containing ammonia (2.5mol / L) solution to obtain a zinc-nickel mixed solution, wherein the concentration of ammonium chloride is 1.5mol / L, and an appropriate amount of 1:1 hydrochloric acid is added Adjust the pH of the solution to be 7.25, and the zinc in the solution is mainly Zn(NH 3 ) 2 Cl 2 The form precipitates with a small amount of Zn(OH) 1.6 Cl 0.4 Precipitated in the form of , the white precipitate was separated by filtration, and the filter cake was dried to obtain 69.78 g of zinc precipitate; the filtrate was the nickel ammonia complex solution.

Embodiment 3

[0024] The nickel-zinc hydroxide co-precipitate in the electroplating sludge treatment process is leached with ammonium chloride-containing ammonia (3.5mol / L) solution to form a mixed solution containing 60g / L of zinc and 50g / L of nickel, in which ammonium chloride The concentration of the solution is 3.5mol / L, adding 1:1 hydrochloric acid to adjust the pH value of the solution to 7.5, and the zinc in the solution is only expressed as Zn(NH 3 ) Cl 2 form precipitation, the white precipitate was separated by filtration, and the filter cake was dried to obtain 152.13 g of the zinc precipitate; the filtrate was the nickel ammonia complex solution.

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Abstract

The invention discloses a method for the wet separation of mixed solution containing nickel and zinc. The method comprises the following steps of: adding ammonia water or chlorhydric acid into the mixed solution containing the nickel and the zinc; adjusting the pH value of the solution to between 6.25 and 7.5; filtering the solution; and drying a filter cake to obtain a zinc deposit, wherein the filtrate is solution of nickel ammine. The method has strong process universality, is suitable for various mixed solution containing the nickel and the zinc, can control the process condition easily, has simple devices, easily realizes large-scale production, and has a low processing cost and significant economic benefits and social benefits.

Description

technical field [0001] The invention relates to a wet separation method for a mixed solution containing nickel and zinc. Background technique [0002] The common methods for separating nickel and zinc are: neutralization method, concentrated sulfuric acid crystallization method, sulfide precipitation, electrowinning method, solvent extraction and ion exchange method, hydrogen reduction method and alkali leaching method. Said method all has certain defectives: [0003] 1) The neutralization method and concentrated sulfuric acid concentration crystallization method are not enough to effectively separate nickel and zinc. [0004] 2) The electrowinning method is only suitable for removing trace amounts of nickel from zinc sulfate solution. [0005] 3) Solvent extraction and ion exchange methods are commonly used in industry to purify zinc in nickel electrolysis anolyte, but these two methods are only suitable for separating trace zinc in nickel sulfate solution. Moreover, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/04C22B19/00C22B23/00
CPCY02P10/20
Inventor 郑国渠
Owner ZHEJIANG UNIV OF TECH
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