Method and device for circulation and regeneration of acidic waste etching liquid

Abstract

The invention relates to a method and a device for recycling acidic waste etching liquid. The method and the device adopt three closed cycles, namely, an acidic waste etching liquid copper separation and component adjustment cycle, a copper extraction agent cycle, and an electrolytic copper extraction and a back extraction agent cycle. The acidic waste etching liquid from which copper is removed by a copper-extraction and back-extraction mechanism is subjected to component adjustment so as to be circularly used by an acid etching machine, the extraction agent is circularly used in the copper-extraction and back-extraction mechanism, the back extraction agent is returned to the copper-extraction and back-extraction mechanism to be circularly used after copper is removed by electrolyzing deposited copper, and electrolytic copper generated by electrolyzing deposited copper can be sold as a commodity. Therefore, in the whole treatment process, the closed cycles of materials are realized with wastewater discharge avoidance, effective copper recovery and recycling use of waste etching liquid and other materials. In addition, the extraction and back extraction of the copper extraction agent are carried out in the copper-extraction and back-extraction mechanism and liquid in a cell flows in an overflow manner without requiring a pump, so the device is convenient in operation and compact in overall structure.

Description

technical field [0001] The invention relates to the technical field of waste etching solution, in particular to a recycling method and device for acidic waste etching solution. Background technique [0002] The production process of existing printed circuit boards is long, and the etching process is a part with the largest proportion in the PCB production process; in the etching process, when the etching solution has too many dissolved substances, the etching index (including speed, side erosion coefficient, etc.) Surface cleanliness, etc.) is lower than the process requirements, it becomes waste etching solution (including acid etching solution, alkaline etching solution and micro etching solution). Acid etching is mainly used in the production of inner layer circuit patterns of multilayer circuit boards; generally speaking, every 1m produced 2 The circuit board needs to consume 2-2.5L of etching solution, and correspondingly produce 2-2.5L of etching waste solution, which...

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Problems solved by technology

[0003] The treatment methods for acidic waste etching solution at home and abroad mainly include replacement method, electrolysis method, neutralization precipitation method, etc.; the grade of sponge copper obtained by the replacement method is not high, and the copper content in the tail liquid after copper recovery is high; the copper powder produced by the electrolysis method Although the purity is high, the performance is superior to copper powder produced by other methods; however, the efficiency of copper powder produced by electrolysis is relatively low, the power consumption is high, and the concentration of heavy metal ions in the waste liquid cannot be reduced very low. Strict treatment is required, and the electrolysis method is easy to produce chlorine gas; the process of treating copper-containing waste liquid by neutralization precipitation method is simple and the investment is small, but the copper content in the mother liquor after copper sulfate crystallization is high, and further treatment is required, and the waste water in the waste water cannot be treated. Inorganic and organic substances such as ammonium salts are recycled, causing serious environmental pollution

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