METHOD OF REGENERATING COPPER CHLORIDE HYDROCHLORIDE ETCHING SOLUTION BY ELECTROLYSIS Russian patent published in 2024 - IPC C23F1/46 C23G1/36 C25C1/12 C25C5/02 

FIELD: various technological processes.

SUBSTANCE: invention relates to regeneration of copper chloride hydrochloride solution containing 50–80 g/l of copper (II) ions, 150–200 g/l of hydrochloric acid, used for etching copper in production of printed circuit boards. Method involves circulation of the solution between a working etching machine and a single-chamber electrolysis unit. Electrolysis is carried out at temperature of 20–25 °C, current density 0.1–0.2 A/dm² on graphite anode, current density 10–20 A/dm² on titanium cathode. At that, metal copper in the form of powder is continuously removed from the cathode surface.

EFFECT: constant composition of copper chloride hydrochloride solution in terms of copper ions in the etching machine, elimination of chlorine release on the electrolyser anode used for regeneration, as well as reduction of specific power consumption.

1 cl, 6 ex