METHOD FOR SELECTIVE EXTRACTION OF NOBLE METALS AND METALS OF PLATINUM GROUP FROM ACID SOLUTIONS Russian patent published in 2003 - IPC

FIELD: metallurgy, in particular, extraction of noble metals and metals of the platinum group from poor and ultrapoor industrial waste. SUBSTANCE: the method of extraction of metals from acid solutions consists in extraction of metals by passing a solution of acidic nitrate through at least one column with a solid extragent. After extraction of metals they are reextracted and added to the initial acid solution with provision of concentration of each metal within 5 to 30 g/l, then electrolytic deposition of metals is made by potentiostatic electrolysic on the line of potentiostatic cells, each containing a three-dimensional porous electrode of carbon material, the working potential of each cathode corresponds to a definite metal of the platinum group. EFFECT: provided separate production of metals of the platinum group in a single cycle of processing of industrial waste, as well as enhanced efficiency of the method for processing of industrial waste with low concentrations of metals. 5 cl, 1 ex