Regenerated acidic etching solution, copper recycling method and special device thereof

Abstract

The invention discloses regenerated acidic etching solution, a copper recycling method and a special device thereof, belonging to the field of electrochemically recycling waste solution and nonferrous metal. An electrolytic tank in electrochemical treatment is divided into an anode chamber, an intermediate chamber and a cathode chamber. Dilute sulfuric acid solution is contained in the anode chamber, and a lead-tin-calcium alloy plate is adopted as an anode electrolytic plate. Waste acidic etching solution is contained in the intermediate chamber. Copper sulfate solution is contained in the cathode chamber, and a stainless steel plate is adopted as a cathode electrolytic plate. Under the function of an electric field, copper is dissolved out from a copper sulfate system. Water in the anode chamber is oxidized to generate oxygen gas and hydrogen ions. When the concentration of the copper ions is reduced to 1g or lower than 1g, the etching solution can be used anew. The method greatly reduces the production cost and causes no atmospheric pollution at the same time as realizing the recycling.

Description

technical field [0001] The invention relates to a method for regenerating acidic etching solution, which relates to a method for recovering metal copper in acidic etching solution by direct electrolysis and regenerating and recycling the acidic etching solution. It belongs to the field of waste liquid resource treatment and non-ferrous metal recovery. Background technique [0002] All over the world, the electrical and electronic industry is one of the fastest growing industries. As an important part of electrical and electronic products, the output of printed circuit boards (PCB) is increasing day by day, resulting in a large amount of circuit board etching waste production and emissions. [0003] Acidic etching solution is an etching solution suitable for fine line production and inner layer production of multi-layer boards because of its characteristics of small side erosion, easy control of etching rate and easy regeneration. After the circuit board is pasted, exposed,...

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Problems solved by technology

A large amount of alkali will be consumed during neutralization and precipitation, only the copper in it can be recovered, hydrochloric acid cannot be recovered, and a large amount of waste water is generated which is difficult to handle, resulting in waste of resources and environmental pollution; conventional electrolysis methods avoid Cu in the cathode area. + It migrates to the anode area and re-oxidizes into Cu. The configuration of small cathode and large anode is not very convenient in operation, and chlorine gas will be precipitated at the cathode, which will pollute the environment. In addition, the corrosion of the plate in the copper chloride hydrochloric acid system is serious. higher cost

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