Method for electrolysis recovery of copper from acidic etching liquid and PCB waste

Abstract

The invention relates to a method for electrolysis recovery of copper from an acidic etching liquid and PCB waste, and belongs to the technical field of resource recycling. According to the method, metals are directly dissolved through the reaction between a waste etching liquid and PCB waste, and the metal copper is recovered through electrolysis; and under a certain condition, crushed PCB wasteis dissolved in a waste etching liquid, the obtained solution is subjected to oxidation regeneration in the anode chamber of a two-film three-chamber electrolysis cell while electrodeposition of copper is performed in a cathode chamber, and the recovery rate of copper can reach more than 98%. According to the present invention, the treatment process is simple, the burning induced pollution can beavoided, the added value is high, and the good economic parameters and the environmental benefits can be achieved.

Description

technical field [0001] The invention belongs to the technical field of resource recovery, and in particular relates to a method for electrolytically recovering copper from acid etching solution and PCB waste. Background technique [0002] With the advancement of electronic technology, the update speed of electronic digital products has become faster and faster, and the core component printed circuit board (PCB) has also become very important. About 4,000 tons of electronic waste is generated globally every year. Recycling and separating valuable metals from these industrial wastes can increase the economic benefits of the process and reduce environmental pollution. [0003] In order to achieve the ideal thickness and shape in the PCB production process, it is necessary to etch the fabricated PCB to complete the PCB circuit pattern. Among them, the acidic copper chloride etching solution is used in the largest amount, and the main component is CuCl 2 And HCl, the etching ra...

AI Technical Summary

Problems solved by technology

The concentration of the electrochemically reduced etchant increases due to the etching reaction, so it needs to be reconstituted before it can be used continuously, and the regenerated etchant contains a large amount of impurity ions, so the etching rate is difficult to control

[0006] PCB metal recovery adopts copper sheet as anode electrolysis method, and uses waste etching solution as anolyte to electrolyze and dissolve metal. Although this method can avoid chlorine evolution reaction and quickly dissolve metal, as the electrolysis time increases, anode dissolution will cause current Density changes make the process parameters extremely unstable, which is not suitable for industrial production. The open circuit caused by the melting of copper sheets makes it impossible to recycle some copper sheets, which greatly reduces the recovery yield.