Chlorine-free acid etching solution regeneration and copper recovery device and method thereof

Abstract

The invention discloses a chlorine-free acid etching solution regeneration and copper recovery device and a method thereof. The regeneration and copper recovery device comprises an etching tank (1), an electrolytic tank (2), a regeneration cylinder (3) and a secondary electrolytic tank (4), wherein the electrolytic tank (2) and the secondary electrolytic tank (4) are respectively provided with ananode area and a cathode area, the anode area and the cathode area are connected with the regeneration cylinder (3) through a pipeline, cuprous ions in etching waste liquid can be oxidized and used asetching liquid to return to the etching tank (1), and when oxygen in the regeneration cylinder (3) is insufficient to completely oxidize the copper oxide ions, the secondary electrolytic tank can bestarted to realize supplementary electrolysis regeneration on the etching liquid in the regeneration cylinder (3). The regeneration and copper recovery device has the beneficial effects that the electrolytic etching waste liquid can be recycled, chlorine is not generated in the working process, and the etching waste liquid can be regenerated and recycled while elemental copper is recycled.

Description

technical field [0001] The invention relates to the field of recovery and treatment of etching waste liquid, in particular to a chlorine-free acid etching liquid regeneration and copper recovery device and method thereof. Background technique [0002] In the prior art, the process of electrolytically extracting copper from circuit board acidic etching solution adopts the etching solution of high chloride ion concentration (200-210 g / liter) as the anolyte, and from the electrochemical reaction, the anode reaction is 2Cl-2e=Cl 2. The cathode reaction is Cu 2+ +2e=Cu. Calculating from the reaction of the above-mentioned negative and positive poles, the electrolytic extraction of one ton of copper will produce 1.116 tons of chlorine gas. Chlorine gas can irritate the eyes, nose, throat and upper respiratory tract, etc., and has serious harm to the human body. When the weight concentration reaches 3000 mg / m3, the respiratory center can be paralyzed and lightning death occurs. ...

AI Technical Summary

Problems solved by technology

Such high cost expenditure not only adds a heavy burden to the circuit board factory, but also has the risk of chlorine gas leakage

And, balance the chlorine ion that loses by adding hydrochloric acid, three grades of concentration in the process hydrochloric acid are respectively greater than or equal to 31.0%, 33.0% and 36.0%, supplement wherein any grade of hydrochloric acid all brings a large amount of water, will like this As a result, the total amount of etching solution continues to expand, so the expanded part must be regularly discharged for additional treatment, resulting in waste of resources and environmental pollution

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