Recycling and regenerating process method and metal copper recovery system of acid chloride etching solution

Abstract

The invention discloses a recycling and regenerating process method and a metal copper recovery system of an acid chloride etching solution. The system comprises an acid etching bath, a membrane electrolytic bath and an automatic control device, wherein the membrane electrolytic bath is connected to the acid etching bath through a pump, and is divided into a cathode region and an anode region by a separation membrane support, and the anode region adopts an immersion reflow anode; the automatic control device is connected to the membrane electrolytic bath, and is used for pumping the etching solution to the anode region of the membrane electrolytic batch from the etching bath by the pump, and pumping the etching solution after being subjected to electrolytic regeneration treatment to the etching work bath from the anode region by the pump to continue to carry out the etching operation; and when the etching solution is regenerated in the anode region, copper ions permeate an ion-exchange membrane into the cathode region and is deposited on a cathode, so that the electrolytic recovery of copper is realized. In the system, the etching solution is regenerated while the metal copper is recovered, the regenerated etching solution returns to the etching groove to continue working without discharging any waste water, waste gas or waste matter; and the fully automatic control of the whole system is realized.

Description

technical field [0001] The invention relates to a recycling method and a metal recovery system for an acid chloride etchant, in particular to a recovery device for copper in acid etching waste liquid in the printed circuit board industry and a method for regenerating the waste liquid, involving the realization of acid chloride by electrolysis The recycling process method of etching solution and the equipment for recovering metal copper at the same time. Background technique [0002] In the production process of printed circuit boards, the recovery and regeneration of acidic copper chloride etching solution has always plagued printed circuit board enterprises. The non-renewable acidic copper chloride etching solution contains about 100 grams to 180 grams of copper per liter, only Guangdong This kind of waste etching solution produced every month in the province contains thousands of tons of copper. If this kind of metal copper can be recovered and the waste etching solution c...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many units researching and developing copper chloride etching solution electrolytic recovery of copper at home and abroad, including many scientific research institutes, colleges and universities, etc. The equipment developed by them has different problems in the process of use, which makes them unable to be put into industrial use, such as : After electrolytic copper extraction, the etching solution cannot be recycled, which not only pollutes the environment, but also leads to waste of chemical raw materials; another technical problem is that chlorine gas will be precipitated from the anode during the electrolysis process. According to theoretical calculations, every 100kg of electrolytic deposition Copper, correspondingly, 111.6kg of chlorine gas will be precipitated at the anode, and its volume in the standard state is about 35.26m 3 , how to properly dispose of a large amount of chlorine gas and residual waste liquid without causing secondary pollution to the environment will undoubtedly increase the cost and complicate the equipment

[0004] The Chinese patent "Regeneration of Copper Chloride Acidic Etching Solution and Copper Recovery Device" (ZL200520067901) discloses a copper extraction method. The device adopts the method of collecting chlorine gas for electrolytic copper recovery. The collection equipment for toxic chlorine gas is difficult to operate. Poisonous gas leakage safety hazards, post-processing and other issues restrict the popularization and application of this technology

[0005] In the Chinese patent "A Regeneration System of Acidic Etching Solution Containing Copper Ions" (CN201834972U), the chlorine gas precipitated from the electrolytic anode is used to absorb the oxidant used as the etching solution, which partially solves the problem of chlorine gas precipitation, but the system still has to face the leakage of poisonous gas The impact on safe production is greatly limited in actual production applications

Images