METHOD FOR ELECTRIC MEMBRANE REGENERATION OF SOLUTION FOR REMOVAL OF CADMIUM COATINGS AND DEVICE THEREFOR Russian patent published in 2016 - IPC C25F7/02 C23F1/46 

FIELD: chemistry.

SUBSTANCE: invention relates to regeneration of process solutions. Method of regenerating solution for removing cadmium coating, containing ammonium nitrate 100-200 g/l, involves electrolysis of solution to be regenerated in two-chamber electrolysis cell with cation-exchange membrane, cathode made of stainless steel and platinised niobium anode. Electrolysis is carried out at current density on electrodes of 1-3, 5 A/dm², anolyte used is regenerated solution, and catholyte used is a solution containing ammonium nitrate, and gas released on cathode is fed into anolyte. Method is implemented in a device comprising a two-chamber electrolysis cell with cation-exchange membrane, stainless steel cathode and platinised niobium anode, and a bubbler installed at bottom of anode chamber and configured to feed gas released on cathode into anolyte.

EFFECT: invention enables regeneration of a solution to remove cadmium coating and prevents possibility of contamination of regenerated solution with foreign ions.

2 cl, 3 ex