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Integral disposal process of acid copper chloride etching waste liquid

A technology of etching waste liquid and copper chloride, which is applied in copper sulfate, photographic technology, chlorine/hydrogen chloride, etc., can solve the problems of poor economic benefits and high recycling costs, and achieve the goals of saving production costs, maximizing profits, and flexible operability Effect

Inactive Publication Date: 2016-12-07
方亚飞 +1
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Problems solved by technology

[0004] The invention provides a comprehensive treatment process for acidic copper chloride etching waste liquid, the purpose of which is to solve the problems of high recovery cost and poor economic benefit in the prior art

Method used

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  • Integral disposal process of acid copper chloride etching waste liquid

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] A comprehensive disposal process for acid copper chloride etching waste liquid, comprising the following steps in sequence:

[0027] (1) Recovery of hydrochloric acid

[0028] ① Add acidic etching waste liquid with copper content ≥ 9.5% into the enamel reaction kettle with insulation layer, then slowly add concentrated sulfuric acid, and stir at 50-60 rpm to form a mixed solution; the amount added is about 35% of the weight of the etching waste liquid. %, due to the addition of concentrated sulfuric acid, the exothermic temperature of the solution rises to 70-80°C;

[0029] Wherein, the concentration of the concentrated sulfuric acid is 99.8%; the addition of the concentrated sulfuric acid is 1.3 times of the theoretical value required for the complete reaction of the copper ion content and the sulfuric acid in the enamel reactor;

[0030] ② Tu...

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Abstract

The invention relates to an integral disposal process of acid copper chloride etching waste liquid. The integral disposal process comprises the process steps of (1) recovering hydrochloric acid; adding acid etching waste liquid into concentrated sulfuric acid; performing distillation recovery at the pressure of -0.05MPa and the temperature of 80 to 90 DEG C; (2) recovering ammonium sulphate; filtering a concentration solution; cooling filtering liquid to separate out ammonium sulphate crystals; (3) recovering electro deposited copper or copper sulphate; concentrating filter residue after the solution is filtered; selecting the final product according to the market conditions of the electro deposited copper and the copper sulphate in the market; (4) then, recovering ammonium sulphate. The process provided by the invention has the advantages that the operation is flexible; the consumption of alkali is greatly reduced; the production cost is reduced.

Description

technical field [0001] The invention relates to a method for recovering useful resources from industrial waste liquid, in particular to a comprehensive treatment process for acid copper chloride etching waste liquid. Background technique [0002] In recent years, with the steady growth of the world's electronics industry, China's printed circuit boards have developed rapidly with a growth rate of more than 20%. At present, the copper clad laminate etching process used by circuit board manufacturers mainly includes "hydrochloric acid + oxidant etching" and "ammonia + ammonium chloride etching". The etching waste liquid produced by the former production process mainly contains copper chloride and hydrochloric acid, which is strongly acidic, and is called acidic copper chloride etching waste liquid; the etching waste liquid produced by the latter production process mainly contains copper chloride complex Compound and ammonium chloride, the waste liquid is slightly alkaline, ca...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/07C01C1/24C01G3/10C25C1/12C23F1/46
CPCC01B7/0712C01C1/24C01G3/10C23F1/46C25C1/12Y02P10/20
Inventor 方亚飞方婷
Owner 方亚飞
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