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An optimized method for zinc recovery from electrogalvanizing waste

An optimization method and waste technology, applied in zinc oxide/zinc hydroxide and other directions, can solve the problems of low process cost and low zinc recovery rate, and achieve the effects of simple process, improved recovery rate and low recovery cost

Inactive Publication Date: 2017-04-12
苏州市金星工艺镀饰有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: In order to solve the problem that the recovery rate of zinc in the waste mud cake of electrogalvanizing is not high in the prior art, the present invention proposes a process for zinc-containing waste mud cake with high recovery rate and low process cost. Optimal method for recovery and reuse of zinc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] An optimization method for recycling zinc from electrogalvanizing waste, comprising the following optimization steps:

[0025] (1) Optimization of the acid leaching step: the mud cake is placed in a mixed acid solution for staged leaching treatment. The mixed acid is a mixture of hydrochloric acid, acetic acid, and sulfuric acid with a volume ratio of 3:2:3, and the leachate is measured every 20 minutes When the pH value increases by 1, re-add the mixed acid to the initial pH, do not continue to add the mixed acid after leaching for 2 hours, take out the filtrate, filter and save it when the pH end point is 5.0, and discard the filter residue;

[0026] (2) Optimization of evaporative concentration oxidation step: Evaporate and concentrate the filtrate obtained in step (1). When heated to 70°C, add oxidant a, maintain the temperature and continue heating for 50 minutes, then continue heating and continuous evaporative concentration operation; after heating to constant wei...

Embodiment 2

[0033] An optimization method for recycling zinc from electrogalvanizing waste, comprising the following optimization steps:

[0034] (1) Optimization of the acid leaching step: the mud cake is placed in a mixed acid solution for staged leaching treatment. The mixed acid is a mixture of hydrochloric acid, acetic acid, and sulfuric acid with a volume ratio of 3:2:3, and the leachate is measured every 20 minutes When the pH value increases by 1, re-add the mixed acid to the initial pH, do not continue to add the mixed acid after leaching for 2 hours, take out the filtrate, filter and save it when the pH end point is 5.5, and discard the filter residue;

[0035] (2) Optimization of evaporative concentration oxidation step: Evaporate and concentrate the filtrate obtained in step (1). When heated to 70°C, add oxidant a, maintain the temperature and continue heating for 60 minutes, then continue heating and continuous evaporative concentration operation; after heating to constant wei...

Embodiment 3

[0042] An optimization method for recycling zinc from electrogalvanizing waste, comprising the following optimization steps:

[0043] (1) Optimization of the acid leaching step: the mud cake is placed in a mixed acid solution for staged leaching treatment. The mixed acid is a mixture of hydrochloric acid, acetic acid, and sulfuric acid with a volume ratio of 3:2:3, and the leachate is measured every 20 minutes When the pH value increases by 1, re-add the mixed acid to the initial pH, do not continue to add the mixed acid after leaching for 2 hours, take out the filtrate, filter and save it when the pH end point is 5.2, and discard the filter residue;

[0044] (2) Optimization of evaporative concentration and oxidation step: Evaporate and concentrate the filtrate obtained in step (1). When heated to 70°C, add oxidant a, maintain the temperature and continue heating for 55 minutes, then continue heating and continuous evaporative concentration operation; after heating to constant w...

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Abstract

The invention discloses an optimized method for recycling electrogalvanizing waste zinc. An appropriate method and an appropriate treating agent are selected according to the chemical property that a solid product of electrogalvanizing wastewater contains a main ingredient zinc-containing mud cake, optimization operation is carried out in the steps of acid leaching, evaporation concentration oxidation, replacement treatment and neutralizing treatment, and finally a zinc product zinc oxide is obtained. Compared with the traditional recycling method, recovery rate of zinc is greatly improved, recycling cost is low, technology is simple, no wastewater is discharged, new pollution is not produced, and environmental and economic values are realized.

Description

technical field [0001] The invention relates to a method for recovering metal, in particular to an optimized method for recovering zinc from electrogalvanizing waste. Background technique [0002] As an excellent protective coating for ferrous metals, galvanizing is widely used, accounting for almost 60% to 70% of all types of plating in electromechanical, construction, hardware and other industries. The use of various colors of passivation film not only increases the decorative effect, but also improves the corrosion resistance. However, with the continuous development and promotion of the galvanizing process, a large number of substances harmful to the environment and human body have been produced. [0003] The impact of industrial waste on environmental quality is becoming more and more serious, especially heavy metal pollution. Heavy metals entering the soil not only affect soil fertility and the quality of agricultural products, but also accumulate in animals and plan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/02
CPCC01G9/02
Inventor 冯正元冯育华
Owner 苏州市金星工艺镀饰有限公司