METHOD OF ELECTROCHEMICAL EXTRACTION OF NOBLE METALS Russian patent published in 2015 - IPC C22B11/00 C25C1/20 C22B7/00 

FIELD: chemistry.

SUBSTANCE: method of electrochemical extraction of noble metals includes processing of metal in electrolyte with leaching and preliminary activation of noble metals by alternate current and their following electro-sedimentation from electrolyte on cathode. Preliminary activation of noble metals and their following electro-sedimentation from electrolyte on cathode is carried out at temperature 90-160°C under conditions of overlaying electrolysis processes in alternate and constant currents. Electro-sedimentation of noble metals on cathode is carried out cyclically in conditions of electrolyte volume reduction until current passing stops. Then fresh electrolyte is added to initial volume and stage of electro-sedimentation is repeated. Quantity of cycles of electro-sedimentations of noble metals on cathode constitutes 1-3.

EFFECT: method simplification and increased extraction of noble metals due to provision of more effective depassivation of noble methods and acceleration of electro-sedimentation kinetics.

2 cl, 4 ex