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Method for producing electrolytic zinc through high-chloride zinc ash material ammonia leaching ion exchange combined process

An ion exchange and combined process technology is applied in the field of electrolytic zinc production by ammonia leaching ion exchange combined process of high chloride zinc ash material, and achieves the effects of high resource utilization, cost reduction and water volume reduction.

Inactive Publication Date: 2017-02-15
吉首市金湘资源科技开发有限公司
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is exactly to solve above-mentioned problem, proposes a kind of method for producing electrolytic zinc by ammonia immersion ion exchange combined process of high-chloride zinc ash material, this method can make the chlorine in the zinc ash of high chlorine content be effectively removed, make this kind The material can be recycled through the wet zinc smelting process, and the water consumption in the process is reduced. At the same time, the method has the characteristics of high chloride ion concentration in the ammonia leaching solution and good process stability, so as to make up for the shortcomings of the existing technology

Method used

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  • Method for producing electrolytic zinc through high-chloride zinc ash material ammonia leaching ion exchange combined process
  • Method for producing electrolytic zinc through high-chloride zinc ash material ammonia leaching ion exchange combined process

Examples

Experimental program
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Effect test

example 1

[0025] Example 1: The main components of a certain zinc ash 1 are as follows:

[0026] element Zinc% lead% chlorine% iron% content 56.3 1.2 17.1 1.5

[0027] Using the following treatment process:

[0028] (1) Ammonia immersion in pulping: transport 6 tons of zinc ash to the pulping tank, which is a mechanical stirring tank with an effective volume of 36m 3 , use rinsing water as the pulping solution, return part of the ammonia leaching filtrate and mix it into the pulping tank to control the liquid-solid ratio to 6:1, start the agitator to stir evenly, add ammonium bicarbonate, ammonia water, etc. to carry out ammonia leaching operation, ammonia leaching process control The time is 1 h, the temperature is 40° C., and the pH at the end point is adjusted to 7. The output ammonia leaching liquid contains 82g / L of chloride ions, and the open circuit part is evaporated to recover chlorine salt 1; the output ammonia leaching residue contains 2.1% ch...

example 2

[0035] Example 2: The main components of a certain zinc ash 2 are as follows:

[0036] element Zinc% lead% chlorine% iron% content 51.2 2.2 15.9 2.5

[0037] Using the following treatment process:

[0038] (1) Ammonia immersion in pulping: transport 6 tons of zinc ash to the pulping tank, which is a mechanical stirring tank with an effective volume of 36m 3 , use rinsing water as the pulping solution, return part of the ammonia leaching filtrate and mix it into the pulping tank to control the liquid-solid ratio to 6:1, start the agitator to stir evenly, add ammonium bicarbonate, ammonia water, etc. to carry out ammonia leaching operation, ammonia leaching process control The time is 1 h, the temperature is 50° C., and the final pH is adjusted to 8. The output ammonia leaching liquid contains 86g / L of chloride ions, and the open circuit part is evaporated to recover chlorine salt one; the output ammonia leaching residue contains 1.7% chlorine.

...

example 3

[0042] Example 3: A certain zinc ash 3 main components are as follows:

[0043] element Zinc% lead% chlorine% iron% content 60.3 1.1 10.4 0.5

[0044] Using the following treatment process:

[0045] (1) Ammonia immersion in pulping: transport 6 tons of zinc ash to the pulping tank, which is a mechanical stirring tank with an effective volume of 36m 3 , use rinsing water as the pulping solution, return part of the ammonia leaching filtrate and mix it into the pulping tank to control the liquid-solid ratio to 6:1, start the agitator to stir evenly, add ammonium bicarbonate, ammonia water, etc. to carry out ammonia leaching operation, ammonia leaching process control The time is 1 h, the temperature is 30° C., and the pH at the end point is adjusted to 9. The output ammonia leaching liquid contains 84g / L of chloride ions, and the open circuit part is evaporated to recover chlorine salt 1; the output ammonia leaching residue contains 2.4% chlorine....

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Abstract

The invention discloses a method for producing electrolytic zinc through a high-chloride zinc ash material ammonia leaching ion exchange combined process. The method comprises the steps that (1) high-chloride zinc ash is made into slurry, ammonia is added to conduct ammonia leaching; ammonia leaching filter residues and ammonia leaching filtrate are obtained after filtration; if the concentration of chloride ions in the filtrate is less than 80 g / L, slurrying and ammonia leaching are conducted again; and if the concentration of chloride ions in the filtrate is greater than 80 g / L, a way is opened, and chlorine salt I is recovered; the ammonia leaching filter residues are rinsed to obtain rinsing water and after-rinsed zinc ash, the after-rinsed zinc ash is subjected to sulfuric acid leaching to obtain a zinc sulfate solution and leaching residues, and the leaching residues are used for recovery of zinc and lead; chloride ions are removed from the zinc sulfate solution by using ion exchange resin, the zinc sulfate solution is subjected to electrodeposition sending and zinc is recovered after dechlorination, and an ion exchange desorption after-solution is subjected to dechlorination to generate chlorine salt II and returns to the ion exchange resin as a desorption reagent. Through the method, high-efficiency and low-cost impurity removal and harm removal of high-chloride zinc ash with the treatment effect which is several times higher than the treatment limit effect obtained through an existing dechlorination process is realized; a new acceptable raw material source is provided for production of electrolytic zinc; emissions of waste liquor and waste residues are avoided, and the environmental protection effect and economic and social benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, in particular to a method for producing electrolytic zinc through a combined process of ammonia immersion and ion exchange of high-chloride zinc ash materials. Background technique [0002] With the continuous depletion of zinc ore resources, more and more attention has been paid to the use of zinc ash with high chlorine content for wet production of electrolytic zinc. However, under normal circumstances, zinc ash contains a large amount of chlorine in the form of compounds, generally ranging from 1% to 30%. If these impurity components are not removed, the subsequent electrowinning operation will be seriously affected. How to effectively remove such harmful impurities has always been a problem that people have not solved well. [0003] At present, the common methods for zinc ash dechlorination in the zinc smelting industry include fire method and wet method. The fire method mainly incl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/30C22B7/00C25C1/16C01B9/02
CPCC01B9/02C22B7/007C22B7/008C22B19/30C25C1/16Y02P10/20
Inventor 宋志红王国良
Owner 吉首市金湘资源科技开发有限公司
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