Comprehensive utilization method of acidic and alkaline waste etching solution

An acid-base etching, waste liquid technology, applied in copper sulfate, carboxylate preparation, photography process and other directions, can solve the problems of high recovery cost, small processing volume, high processing cost, and achieve low processing cost, large processing volume, Highly economical effect

CN101654275AInactive Publication Date: 2010-02-24广州市白云区南溪化工厂
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2010-02-24
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention provides a comprehensive treatment method of acidic and alkaline waste etching solution of circuit boards, belonging to the technology in the field of environmental protection. The method is characterized by neutralizing and precipitating the acidic waste etching solution and the alkaline waste etching solution under the condition that the pH value is 5-6.5, pulping and then mixing the precipitates and quicklime, dehydrating and then roasting the mixtures at 400-600 DEG C, dissolving calcium chloride in the roasted product by water, separating and removing the residual lime by gravity separating to obtain the copper oxide products with purity being over 98%, or taking the generated copper oxide as the raw material to produce other products. The calcium chloride and ammonia generated in the process are also subjected to concentration, crystallization, ammonia evaporation and absorption to obtain the calcium chloride and ammonia products. The comprehensive treatment methodhas the advantages of total recycle, zero discharge, large treatment capacity, low treatment cost, high product quality, diverse product categories and the like, can not only eliminate environmental pollution radically but also create higher economic benefits.
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Description

technical field

[0001] The invention relates to a comprehensive treatment technology for acidic and alkaline circuit board etching waste liquid, which can be used for resource treatment of circuit board etching waste liquid and belongs to the technical field of environmental protection. Background technique

[0002] The etching waste liquid produced by the printed circuit board industry is a kind of industrial waste liquid with high pollution, and it is also a waste liquid with high copper content. If it is not treated as a resource, it will inevitably cause environmental pollution and waste of resources. At present, most domestic manufacturers engaged in the recycling of circuit board etching waste liquid adopt the process of precipitating and separating copper ions from the liquid phase by adjusting the appropriate pH method. Although this process has the advantages of low processing cost and large processing capacity, etc. , but this method of solid-liquid phase precipita...

Examples

Embodiment Construction

[0017] The specific implementation mode and effect of the present invention are illustrated with each step of the technical process of the comprehensive utilization of the following acid-base circuit board etching waste liquid:

[0018] The first step is the mixed precipitation process: the acidic etching waste liquid and the alkaline etching waste liquid are mixed, a neutralization reaction occurs, the pH value is controlled to be 5-6.5, and basic copper chloride is precipitated.

[0019] The second step, solid-liquid separation and pulping process: the solid-liquid mixture of the above reaction is subjected to solid-liquid separation, and the obtained basic copper chloride is solid-phase added with water to make pulp. Simultaneously, calcium oxide solids are added to water for slurrying.

[0020] The third step, alkali conversion process: the above-mentioned basic copper chloride slurry and lime slurry are fully mixed for reaction, and the addition of lime slurry is controll...