Method and device for recycling printed circuit board waste copper liquid

Abstract

The invention discloses a method and device for recycling printed circuit board waste copper liquid. The method for recycling the printed circuit board waste copper liquid comprises the following steps: S1, filtering the printed circuit board waste copper liquid to remove impurities, and introducing the filtered printed circuit board waste copper liquid into a photocatalytic oxidation pool for oxidation; S2, introducing the waste liquid oxidized in the photocatalytic oxidation tank in the step S1 into an electrolytic cell to serve as an electrolyte for electrolysis; and S3, separating out copper ions in the electrolytic cell in the step S2 from a cathode region of the electrolytic cell, absorbing the copper ions on a cathode plate to form a copper sheet, filtering catholyte after electrolysis is completed, and conveying the catholyte into a regeneration blending chamber for blending. According to the method for recycling the printed circuit board waste copper liquid, acid etching wastecopper liquid on a printed circuit board etching production line is effectively recycled, and under the synergistic effect of ultrasonic waves, an ionic membrane and constant-temperature electrolyte,the copper ion precipitation speed is increased, and the copper ion precipitation purity is improved.

Description

technical field [0001] The invention relates to the technical field of waste copper liquid treatment, in particular to a method and device for recycling waste copper liquid of printed circuit boards. Background technique [0002] With the development of semiconductor technology, integrated circuits with higher performance and stronger functions require greater component density, and the size, size and space of each component, between components or each component itself need to be further reduced, that is, the feature size has ever-shrinking requirements. The corresponding printed circuit board manufacturing technology is a very complex and highly comprehensive processing technology. The chemical mechanical polishing (CMP) process is usually used, that is, the chemical and mechanical removal, grinding, and polishing processes are used to process copper metal, resulting in impurities and pollution such as waste liquid and slag. [0003] Acid etching is an essential process i...

AI Technical Summary

Problems solved by technology

The recycling method of the waste copper solution produced in the acid etching process of the printed circuit board mainly recovers copper ions through the electrolytic reaction and restores the regeneration ability of the etching solution at the same time, but the recycling method of the waste copper solution produced in the acid etching process of the existing printed circuit board is still There are the following problems: 1. The anode of the electrolytic cell has the problem of chlorine gas precipitation

The precipitation of chlorine gas not only endangers the health of workers in the workshop, but also produces air pollution; 2. The organic matter and organic complexes in the waste copper liquid have not been treated; 3. Heat will be generated during the electrolysis of the electrolyte. Cooling, the reaction rate of the electrolytic reaction is greatly reduced; 4, the efficiency of electrolytic copper extraction is low, and the purity is low

Images