Electrolytic full regeneration process for an ammoniacal etching solution

摘要

Known regeneration plants for the full regeneration of ammoniacal tetraamminocupric etching solution operate in accordance with the principle of liquid-liquid extraction. In accordance with the invention, the regeneration is effected by direct electrolysis of the etching solution without prior extraction. The etching solution of the invention consists of tetraamminocupric sulphate, ammonia, ammonium sulphate and a catalyst in order to increase the rate. The etched copper and the etching chemicals used are continuously recovered in a closed circuit by direct electrolysis of the etching solution.