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Method for preparing copper oxide by recovering copper sulfate from micro-etching waste liquid

A technology of micro-etching and copper sulfate, applied in the direction of copper oxide/copper hydroxide, etc., can solve the problems of wastewater that cannot be recycled, high concentration of soluble salts, and large consumption of copper salts, etc., and achieve simple and obvious follow-up wastewater treatment Environmental benefits and high copper recovery efficiency

Active Publication Date: 2014-09-03
SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is relatively mature, but the chemical precipitation method needs to consume a large amount of alkali, and the processing cost is relatively high
The amount of chemical agents is large, the concentration of soluble salts in the discharge water is too high, the waste water cannot be recycled, the sludge output is large, the sludge post-treatment is difficult, and secondary pollution is easy to occur.
[0004] 2. The copper sulfate method is to add copper salt to the micro-etching waste liquid to neutralize the free acid in the waste liquid. The waste liquid is concentrated, cooled and crystallized to obtain copper sulfate. The disadvantage of this method is that the acidity in the waste liquid is high, and the neutral and consume a large amount of copper salt
However, as the reaction proceeds, sodium ions will accumulate, and the complete reuse of waste liquid cannot be achieved.

Method used

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  • Method for preparing copper oxide by recovering copper sulfate from micro-etching waste liquid

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Embodiment 1

[0028] A kind of method that present embodiment reclaims copper sulfate and prepares copper oxide from micro-etching waste liquid, carries out according to the following steps:

[0029] 1. Concentration of micro-etching waste liquid: evaporation and concentration of micro-etching waste liquid until the concentration of copper ions is 60g / L;

[0030] 2. Preparation of mixed crystals of copper sulfate and sodium sulfate: the concentrated micro-etching waste liquid is cooled to 25°C, crystals are precipitated, filtered, and the resulting solid is a mixed crystal of copper sulfate and sodium sulfate;

[0031] Three, the preparation of copper oxide: the copper sulfate that step 2 is made and the mixed crystal of sodium sulfate are mixed with acidic copper chloride etching waste liquid, make the mixing copper content be 130g / L in the reactor, add concentration in the reactor 30% NaOH, adjust the pH of the solution in the reactor to 9, and the temperature to 80° C. After 1 hour, cool...

Embodiment 2

[0034] A kind of method that present embodiment reclaims copper sulfate and prepares copper oxide from micro-etching waste liquid, carries out according to the following steps:

[0035] 1. Concentration of micro-etching waste liquid: evaporation and concentration of micro-etching waste liquid until the concentration of copper ions is 100g / L;

[0036] 2. Preparation of mixed crystals of copper sulfate and sodium sulfate: cool down the concentrated micro-etching waste liquid by 30°C, precipitate crystals, filter, and the resulting solid is a mixed crystal of copper sulfate and sodium sulfate;

[0037] Three, the preparation of copper oxide: the copper sulfate that step 2 is made and the mixed crystal of sodium sulfate are mixed with acid copper chloride etching waste liquid, make the mixed copper content be 140g / L in the reactor, add concentration in the reactor 45% NaOH, adjust the pH of the solution in the reactor to 13, and the temperature to 65° C. After 1 hour, cool and fil...

Embodiment 3

[0040] A kind of method that present embodiment reclaims copper sulfate and prepares copper oxide from micro-etching waste liquid, carries out according to the following steps:

[0041] 1. Concentration of micro-etching waste liquid: evaporation and concentration of micro-etching waste liquid until the concentration of copper ions is 90g / L;

[0042] 2. Preparation of mixed crystals of copper sulfate and sodium sulfate: the concentrated micro-etching waste liquid is cooled to 60°C, crystallized, filtered, and the resulting solid is a mixed crystal of copper sulfate and sodium sulfate;

[0043] Three, the preparation of copper oxide: the copper sulfate that step 2 is made and the mixed crystal of sodium sulfate are mixed with acid copper chloride etching waste liquid, make mixed copper content be 150g / L in the reactor, add concentration in reactor 50% NaOH, adjust the pH of the solution in the reactor to 12, and the temperature to 75° C. After 1 hour, cool and filter, and the ob...

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Abstract

The invention relates to a method for preparing copper oxide, and in particular relates to a method for preparing copper oxide by recovering copper sulfate from micro-etching waste liquid. The method for preparing copper oxide by recovering copper sulfate from micro-etching waste liquid is simple and convenient in operation, energy-saving, simple and feasible in subsequent wastewater treatment and good in product quality, and has economic benefits and wide social benefits. The method for preparing copper oxide by recovering copper sulfate from micro-etching waste liquid comprises the steps of concentrating micro-etching waste liquid, preparing a mixed crystal of copper sulfate and sodium sulfate, and preparing copper oxide. By adopting the preparation method disclosed by the invention, the treatment quantity of acidic waste liquid is reduced, the consumption of alkali is reduced, sulfuric acid can be recovered, the production cost of micro-etching is reduced, meanwhile, the treatment cost of waste liquid is also reduced, and the method is high in copper recovery efficiency and environment-friendly. The method disclosed by the invention is applied in the fields of treatment of micro-etching waste liquid and preparation of copper oxide.

Description

technical field [0001] The invention relates to a method for preparing copper oxide, in particular to a method for recovering copper sulfate from micro-etching waste liquid to prepare copper oxide. Background technique [0002] At present, the main treatment methods of micro-etching waste liquid are chemical precipitation method, copper sulfate method, freezing method and electrolysis method. [0003] 1. The chemical precipitation method is to add alkali to the micro-etching waste liquid to adjust the pH value, so that copper ions form copper salts, and then settle and filter to make copper salt products. This method is relatively mature, but the chemical precipitation method needs to consume a large amount of alkali, and the processing cost is relatively high. The amount of chemical agents is large, the concentration of soluble salts in the discharge water is too high, the waste water cannot be recycled, the sludge output is large, the sludge post-treatment is difficult, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G3/02
Inventor 陈志传萧作平李飞尹新颖石磊李昌喜
Owner SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD