Copper extraction and cyclic regeneration technology of alkaline etching liquid

Abstract

The invention relates to a copper extraction and cyclic regeneration technology of alkaline etching waste liquid. The copper extraction and cyclic regeneration technology comprises the steps that (1)cupric ions in the alkaline etching waste liquid are converted into metal copper to be extracted through the damage-free separation direct electrolysis technology; (2) impurities in the etching liquidare filtered out through a filter; and (3) the alkaline etching waste liquid is adjusted to the qualified alkaline etching liquid through solution proportioning. According to the technology, a closedcycle is adopted, in the whole process, no other foreign substances are introduced, no hazardous substances are generated, solution compositions cannot be destroyed, the technical problems of accumulation of impurities in etching tanks and the like with which all kinds of regeneration cyclic etching liquid are faced during long-time operation are solved well, and the cyclically-regenerated etching liquid can compare favorably with newly-prepared etching liquid.

Description

technical field [0001] The invention relates to a process for extracting copper from alkaline etching waste liquid and recycling it, belonging to the field of electroplating. Background technique [0002] The printed circuit board (PCB) industry in the IT industry is an industry that is highly polluting to the environment. liquid). Usually, the main components of alkaline etching waste liquid are copper chloride, ammonium chloride and ammonia water, in which the mass concentration of copper is 130-180g / L, the pH is 8.0-8.5, and the density is 1.2g / mL. If it is discharged as wastewater, the alkaline etching waste liquid will cause serious harm to water and soil, and it will take a long time to eliminate it, and it will also cause a huge waste of resources. [0003] At present, the treatment method of alkaline etching waste liquid is to self-neutralize alkaline etching waste liquid to recover basic copper chloride or copper sulfate. A large amount of chlorine-containing and ...

AI Technical Summary

Problems solved by technology

If it is discharged as wastewater, alkaline etching waste liquid will cause serious harm to water and soil, and it will take a long time to eliminate it, and it will also cause a huge waste of resources

[0003] At present, the treatment method of alkaline etching waste liquid is to self-neutralize alkaline etching waste liquid to recover basic copper chloride or copper sulfate. A large amount of chlorine-containing and ammonium-containing liquids cannot be effectively used, which will also cause resource pollution. Waste and Environmental Pollution

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