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Secondary zinc oxide recycling method

A technology of secondary zinc oxide and leaching solution, applied in the field of metallurgy and chemical industry, can solve the problems of aggravation, anode damage, affecting the electrolysis process, etc., and achieve the effect of low cost and good effect.

Inactive Publication Date: 2019-06-28
徐州市正峰锌业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, when the content of fluorine and chlorine in the zinc sulfate solution exceeds a certain value, the "burning plate" phenomenon of anode plate dissolution will occur in the later electrolysis process, the current efficiency will decrease, the impurity lead of the electro-zinc product will increase, and the anode will be seriously damaged. The effect is intensified with the increase of chlorine content, seriously affecting the electrolysis process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of secondary zinc oxide reutilization method, it is to take the electric furnace dedusting ash of iron and steel plant as main raw material, then reclaim through following steps:

[0022] a. Mix the dust from iron and steel plant with bituminous coal and send it to the rotary kiln for roasting;

[0023] b. Carrying out alkaline washing and leaching of the roasted cooling product in step a with soda solution, and separating to obtain the leaching solution;

[0024] c. Add hydrogen peroxide to the leaching solution and filter out the precipitated substance;

[0025] d, adding zinc and copper sulfate to the leaching solution and filtering out the precipitated substance;

[0026] e, the leachate is subjected to ion exchange treatment;

[0027] f. Electrolyzing the solution obtained after ion exchange to precipitate zinc.

[0028] The iron and steel factory dust and bituminous coal are mixed at a ratio of 1:1, and the mixture is conveyed into the rotary kiln by a s...

Embodiment 2

[0030] A kind of secondary zinc oxide reutilization method, it is to take the electric furnace dedusting ash of iron and steel plant as main raw material, then reclaim through following steps:

[0031] a. Mix the dust from iron and steel plant with bituminous coal and send it to the rotary kiln for roasting;

[0032] b. Carrying out alkaline washing and leaching of the roasted cooling product in step a with soda solution, and separating to obtain the leaching solution;

[0033] c. Add hydrogen peroxide to the leaching solution and filter out the precipitated substance;

[0034] d, adding zinc and copper sulfate to the leaching solution and filtering out the precipitated substance;

[0035] e, the leachate is subjected to ion exchange treatment;

[0036] f. Electrolyzing the solution obtained after ion exchange to precipitate zinc.

[0037] The iron and steel factory dust and bituminous coal are mixed at a ratio of 3:1, and the mixture is conveyed into a rotary kiln by a scr...

Embodiment 3

[0039] A kind of secondary zinc oxide reutilization method, it is to take the electric furnace dedusting ash of iron and steel plant as main raw material, then reclaim through following steps:

[0040] a. Mix the dust from iron and steel plant with bituminous coal and send it to the rotary kiln for roasting;

[0041] b. Carrying out alkaline washing and leaching of the roasted cooling product in step a with soda solution, and separating to obtain the leaching solution;

[0042] c. Add hydrogen peroxide to the leaching solution and filter out the precipitated substance;

[0043] d, adding zinc and copper sulfate to the leaching solution and filtering out the precipitated substance;

[0044] e, the leachate is subjected to ion exchange treatment;

[0045] f. Electrolyzing the solution obtained after ion exchange to precipitate zinc.

[0046] The iron and steel plant dust and bituminous coal are mixed at a ratio of 6:1, and the mixture is conveyed into a rotary kiln by a screw...

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PUM

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Abstract

The invention discloses a secondary zinc oxide recycling method which comprises the following steps of a, mixing fly ash and soft coal in an iron and steel plant, feeding into a rotary kiln, and roasting; b, alkaline-washing and leaching roasted cooling material in the step a through a pure alkaline liquor, and separating to obtain a leaching agent; c, adding hydrogen peroxide into the leaching agent, and filtering to remove precipitated substances; d, adding zinc and copper sulfate into the leaching agent, and filtering to move precipitated substances; e, carrying out ion exchange treatment on the leaching agent; and f, electrolyzing a solution obtained after ion exchange, and precipitating zinc. According to the secondary zinc oxide recycling method provided by the invention, flucloxacillin and other impurities contained in secondary zinc oxide can be effectively removed, and the operation cost is low.

Description

technical field [0001] The invention relates to the technical field of metallurgy and chemical industry, in particular to a method for reusing secondary zinc oxide. Background technique [0002] The recycling method of secondary zinc oxide is mainly to leaching secondary zinc oxide by dilute sulfuric acid to remove iron ions, copper ions, cadmium ions, cobalt ions and fluorine chloride ions in the zinc sulfate solution, and then carry out the purified zinc sulfate solution Electrolysis, precipitation of zinc, so as to realize the recycling of sub-zinc oxide. Among them, when the content of fluorine and chlorine in the zinc sulfate solution exceeds a certain value, the "burning plate" phenomenon of anode plate dissolution will occur in the later electrolysis process, the current efficiency will decrease, the impurity lead of the electro-zinc product will increase, and the anode will be seriously damaged. The impact is aggravated with the increase of chlorine content, serious...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/02C22B19/20C22B19/30C25C1/16
CPCY02P10/20
Inventor 李子岩
Owner 徐州市正峰锌业有限公司
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