Acidic copper-containing etching liquid treatment method and system

Abstract

The invention provides an acidic copper-containing etching solution treatment method which comprises the following steps: (1) adjusting the pH value of an acidic copper-containing etching solution to0.08-0.12, and adding an oxidant to oxidize copper in the acidic copper-containing etching solution into bivalent copper ions to obtain a mixed system A; (2) adding alkali into the mixed system A to adjust the pH value of the mixed system A to 7.5-8 so as to convert bivalent copper ions in the mixed system A into copper hydroxide precipitates; (3) dissolving the solid precipitate obtained in the step (2) with a sulfuric acid solution to obtain a mixed system B; (4) crystallizing the mixed system B to obtain solid copper sulfate; and (5) performing triple-effect evaporation desalination treatment on wastewater generated after crystallization of the mixed system B in the step (4) to obtain condensate and crystalline salt. According to the method disclosed by the invention, up-to-standard discharge treatment of the acidic copper-containing etching solution is realized, and the acidic copper-containing etching solution is converted into a copper sulfate product, so that the environmental problem is solved, and the economic benefit is achieved; in addition, the system is simple in structure and small in occupied area.

Description

technical field [0001] The invention belongs to the field of environment, and specifically relates to a method and system for treating an acidic copper-containing etching solution. Background technique [0002] Printed circuit board enterprises all go through the etching process in the process of processing circuit boards. The acidic copper-containing etching waste liquid is a kind of industrial wastewater with high copper content and high acidity produced in the process of etching copper foil. The acidic copper-containing etching waste liquid is mainly a copper solution with hydrochloric acid (pH<1) as the medium. The presence of copper heavy metals, if not properly treated in an environmentally friendly manner, will cause a serious waste of resources on the one hand, and on the other hand heavy metals will infiltrate into the soil and water sources after discharge, which will seriously affect the natural environment on which we live and our own health. pollution and ha...

AI Technical Summary

Problems solved by technology

[0006] Direct electrolysis, direct electrolysis A large amount of chlorine gas is precipitated from the anode of acidic copper-containing waste etching solution. Chlorine gas is a highly toxic gas with a lower specific gravity than air. In case of leakage, it will be a major accident. Frequent; equipment maintenance costs are high; electrolyzer current efficiency is low

[0007] Most of the existing comprehensive utilization and treatment technologies for acidic copper-containing etching waste liquid have problems such as low efficiency, high cost, large floor area, and discharge of three wastes.

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