A process and device for recovering hydrochloric acid and producing copper sulfate from acidic etching waste liquid

Abstract

The invention discloses a process and a device of recovering hydrochloric acid and preparing copper sulfate from acidic etching waste liquor and belongs to the field of recovering treatment of waste liquor in electronic industry. The process comprises the following steps of: performing multiple-effect evaporation on the acidic etching waste liquor to be separated to diluted hydrochloric acid and copper chloride crystals, then performing a sulfonation reaction on copper chloride and concentrated sulfuric acid to generate copper sulfate and hydrogen chloride gas, and absorbing the hydrogen chloride gas generated by the reaction by means of diluted hydrochloric acid separated by performing multiple-effect evaporation to produce a hydrochloric acid product, the hydrogen chloride content of which is 31%; and crystallizing and recrystallizing copper sulfate to obtain pure copper sulfate pentahydrate crystals, and after concentration of sulfuric acid-containing mother liquor generated in the sulfonation reaction process, taking part in the sulfonation reaction again. The process and device disclosed by the invention can recover high concentration pure hydrochloric acid and copper sulfate pentahydrate with high purity can be prepared by means of a recrystallizing method. In the operating process, the three wastes are not generated, and the generated liquid, gas and solid are prepared into finished products, the waste liquor is totally treated, the product conversion ratio is high, and the operation is safe and stable.

Description

technical field [0001] The present invention relates to the recovery treatment of a kind of acidic etching waste liquid, more specifically, relate to a kind of process and device for recovering hydrochloric acid and producing copper sulfate from acidic etching waste liquid. Background technique [0002] In printed circuit, electronics and metal finishing industries, acid etching has a wide range of applications, mainly including ferric chloride etching solution, sulfuric acid / hydrogen peroxide system etching solution, acid copper chloride etching solution, etc. The system etching solution is the most widely used etching solution at present. It is suitable for etching the inner layer of the circuit board and the outer layer of the positive film method. The amount of waste liquid generated will be greatly increased, thus increasing the load on the surrounding environment and seriously endangering the health of operators. [0003] The recovery of copper salts in acidic etching...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of low conversion rate of copper sulfate, low operating safety factor and high generation of three wastes in the existing acid etching waste liquid recovery process technology and actual engineering operation, and provide a method for recovering hydrochloric acid from acidic etching waste liquid and its production method. The technique and device for taking copper sulfate adopt the technical scheme of the present invention to recycle high-concentration pure hydrochloric acid, and can produce high-purity copper sulfate pentahydrate through the recrystallization method, and no three wastes are produced in the operation process, and the produced liquid, Both gas and solid are produced into products, the waste liquid is completely treated, the product conversion rate is high, the operation is safe and stable, the treatment cost of acidic etching waste liquid is greatly reduced, and the effective substances in the waste liquid are recovered to the greatest extent

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