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Method for harmless treatment of cuprous cyanide

A harmless treatment, cuprous cyanide technology, applied in the direction of copper oxide/copper hydroxide, etc., can solve the problems of high cost investment and inapplicability, and achieve the effect of low requirements for production equipment, simple process and easy industrialization

Inactive Publication Date: 2019-08-06
惠州TCL环境科技有限公司
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  • Abstract
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Problems solved by technology

Its disadvantage is that the cost of equipment is relatively large, and it is not suitable for handling water-insoluble cuprous cyanide solids

Method used

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  • Method for harmless treatment of cuprous cyanide

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Embodiment Construction

[0016] The process method of the present invention will be further described in detail below in conjunction with specific embodiments of the present invention.

[0017] (1) Add 85kg of sodium sulfide solid (purity 52%) to the reaction tank, add water to make 10% sodium sulfide solution;

[0018] (2) Pour 100kg of cuprous cyanide powder (among them, the mass fraction of cuprous cyanide is 73.6%), stir slowly, fully react, and the reaction time is 40-60min;

[0019] (3) Add a small amount of 0.3% PAM solution to the reaction tank for coagulation and precipitation;

[0020] (4) After standing for solid-liquid separation, filter directly with filter cloth, and collect copper-containing precipitate and filtrate respectively;

[0021] (5) Wash the precipitate twice with a small amount of bleaching water, then wash it with clean water to neutrality, and dry it to obtain high-purity copper oxide powder.

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Abstract

The invention relates to a method for harmless treatment of cuprous cyanide, particularly to recovery of copper from waste cuprous cyanide poisonous powder and further harmless treatment of waste liquid. According to the method, collected waste cuprous cyanide powder is wetted with a small amount of clear water; a copper precipitating agent solution is added, and complete stirring is performed; asmall amount of a flocculant is added, and filtration is performed to obtain a copper-containing precipitate and a cyanogen-containing filtrate; and the copper-containing precipitate is washed with asodium hypochlorite solution to remove the residual cyanide, air drying is performed to obtain high-purity copper oxide, the washing liquid and the cyanogen-containing filtrate are treated by using atwo-stage cyanogen breaking technology, and the treated material is conveyed to a wastewater plant, and is further subjected to harmless treatment so as to be achieve standard discharge. According tothe present invention, the method has advantages of simple process flow, safe operation, low environmental pollution risk and high copper recovery rate, can fully utilize the existing equipment and technology of the workshop, and further has good environmental protection benefits and economic benefits.

Description

technical field [0001] The invention relates to a method for harmless treatment of cuprous cyanide, in particular to the technical field of environmental protection in which copper is recovered from cuprous cyanide chemicals and the cyanide is harmlessly and safely disposed of. [0002] technical background [0003] At present, the treatment technology for cyanide-containing waste liquid is relatively mature, and this type of waste liquid basically does not contain metal elements with recycling value, so it is relatively easy to treat. However, there is no proper disposal method for water-insoluble cyanide solids, such as waste cuprous cyanide solids. Cuprous cyanide is widely used in electroplating, pesticides and other industries. It is a highly toxic substance, and its toxicity is similar to hydrocyanic acid. Therefore, it is necessary to properly dispose of waste cuprous cyanide to avoid safety accidents and environmental pollution. [0004] Patent CN102515388A discloses...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G3/02
CPCC01G3/02
Inventor 张亚红徐群财赵东奎林嫩好龙柳伶
Owner 惠州TCL环境科技有限公司
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