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Method for recovering zinc from waste electrogalvanizing mud cake containing zinc

A technology for electro-galvanizing and mud cake is applied in the field of recovering zinc from the waste zinc-containing mud cake of electro-galvanizing, which can solve the problems of high recovery rate, great environmental harm, low process cost, etc., and achieves improved recovery rate, low recovery cost, simple craftsmanship

Active Publication Date: 2016-05-04
南通好汉邦新材料科技有限公司
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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 problems in the prior art that the discarded mud cake of electrogalvanizing cannot be reused reasonably and is harmful to the environment, the present invention proposes a high recovery rate and low process cost for the waste mud cake containing Zinc Waste Mud Cake Carrying Out Zinc Recovery and Reuse Method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The method for recovering zinc from the waste zinc-containing mud cake of electro-galvanizing specifically comprises the following steps:

[0024] (1) Acid leaching: the mud cake is placed in a mixed acid solution for leaching treatment. The mixed acid is a mixture of hydrochloric acid, acetic acid, and sulfuric acid with a volume ratio of 1:2:5. After leaching for 2 hours, take out and filter to preserve the filtrate. Discard the filter residue;

[0025] (2) Evaporation and concentration: 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 to heat and continue to evaporate and concentrate; heat to constant weight to obtain crystallization, filter Finally, save the filtrate and discard the filter residue;

[0026] (3) Replacement treatment: add reducing agent to the filtrate obtained in step (2), filter and preserve the filtrate after reacting for 30...

Embodiment 2

[0032] The method for recovering zinc from the waste zinc-containing mud cake of electro-galvanizing specifically comprises the following steps:

[0033] (1) Acid leaching: the mud cake is placed in a mixed acid solution for leaching treatment. The mixed acid is a mixture of hydrochloric acid, acetic acid and sulfuric acid with a volume ratio of 1:2:5. After 4 hours of leaching treatment, take out and filter and preserve the filtrate. Discard the filter residue;

[0034] (2) Evaporation and concentration: 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 to heat and continue to evaporate and concentrate; heat to constant weight to obtain crystallization, filter Finally, save the filtrate and discard the filter residue;

[0035] (3) Replacement treatment: add reducing agent to the filtrate obtained in step (2), filter and preserve the filtrate after reacti...

Embodiment 3

[0041] The method for recovering zinc from the waste zinc-containing mud cake of electro-galvanizing specifically comprises the following steps:

[0042] (1) Acid leaching: the mud cake is placed in a mixed acid solution for leaching treatment. The mixed acid is a mixture of hydrochloric acid, acetic acid and sulfuric acid with a volume ratio of 1:2:5. After leaching treatment for 3 hours, take out and filter and preserve the filtrate. Discard the filter residue;

[0043] (2) Evaporation and concentration: 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 to heat and continue to evaporate and concentrate; heat to constant weight to obtain crystallization, filter Finally, save the filtrate and discard the filter residue;

[0044] (3) Replacement treatment: add reducing agent to the filtrate obtained in step (2), filter and save the filtrate after reacting ...

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Abstract

The invention discloses a method for recovering zinc from a waste electrogalvanizing mud cake containing zinc. The method comprises the steps that a proper treatment method and a proper treating agent are selected according to the chemical properties of main elements of a solid product, namely the mud cake containing zinc, of electrogalvanizing waste water; a treatment process comprising the step of acid leaching, the step of evaporation, concentration and oxidization, the step of replacement treatment, the step of secondary oxidization, the step of neutralizing and the step of drying and forging is conducted, and optimization operation is conducted in each step; and a zinc product of zinc oxide is finally obtained. The recovery rate of zinc is greatly increased compared with a traditional recovery method; the recovery cost is low, the technique is simple, wastewater discharge is avoided, and new pollution is avoided; the method has both environmental protection value and economic value.

Description

technical field [0001] The invention relates to a method for recovering metal, in particular to a method for recovering zinc from waste zinc-containing mud cakes of electro-galvanizing. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/30C22B19/34
CPCC22B19/30C22B19/34Y02P10/20
Inventor 冯正元冯育华
Owner 南通好汉邦新材料科技有限公司
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