METHOD OF ELECTROCHEMICAL REGENERATION OF CUPRO-AMMONIUM PICKLING SOLUTION Russian patent published in 2017 - IPC C23F1/46 C23G1/36 

FIELD: chemistry.

SUBSTANCE: method includes electrochemical processing of recycled copper-ammonium pickling solution in a triple-chamber electrolytic cells with two cathode chambers and two cation-exchange membranes, and at first the recycled mortar is subjected to electrochemical processing in the first cathode chamber with current density of 4-6 A/dm², then in the second cathode chamber with current density of 2-3 A/dm², followed by processing in anodic chamber with current density of 0.5-1.0 A/dm². The titanium or stainless steel is used as cathodes, as well as the anode is graphite, titanium or niobium with platinum or ruthenium oxide coating.

EFFECT: enables the control and maintenance without permanent installation of regeneration to reduce the content of copper in copper-ammonium etching solution with entry level to the desired value.