METHOD OF EXTRACTING NOBLE METALS FROM WASTES Russian patent published in 2014 - IPC C22B11/00 C25C1/20 

FIELD: process engineering.

SUBSTANCE: method comprises electrical treatment of minced material pulp in chloride solution and extraction of commercial metals. Both stages are executed in reactor using at least one membrane-free electrolytic cell. At electrical treatment, minced stock pump with S:L ratio equal to 1:(1-20) in chloride solution with chlorine concentration of 60-180 g/l to be acidified to pH 0.2-1.0. At electrical treatment initial stage, pump is mixed at current bulk density of 1000-10000 A/m³ at electrolytic cell permanent voltage of 2-5 V. Termination of pulp electrical treatment is fixed by transition over peak of time dependence of current magnitude and reach of pH 1-2.Treated pulp is fed to the stage of commercial metal extraction. For this cathode current density is set to 50-200 A/m³. Extraction is considered terminated at pH 3-7. Thereafter, cathode residues of both said stages are combined and directed for metal production by known processes.

EFFECT: incidental extraction directly in electrical chlorination of ore pulp.

11 cl 3 dwg, 1 tbl