METHOD FOR SEPARATING PALLADIUM FROM A POWDER SYSTEM CONTAINING PALLADIUM, OTHER METALS AND THEIR COMPOUNDS Russian patent published in 2021 - IPC C22B11/00 C22B3/06 C22B3/20 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy of non-ferrous metals, in particular to the extraction of palladium during the processing of powder systems containing base metals and non-metals. A method for separating palladium from a powder system containing palladium, other metals and their compounds consists in adding concentrated nitric acid to the powder system to dissolve palladium, followed by neutralization of the resulting solution with an aqueous solution of ammonia. The precipitation of base metal hydroxides formed after neutralization is formed by freezing at a temperature no higher than minus 20°C, after thawing, the precipitation is separated by filtration and palladium is recovered from the filtrate. The resulting palladium powder is washed and dried.

EFFECT: completeness of extraction and chemical purity of the obtained palladium powder are improved, the complexity of the operation of separating the solution with palladium is reduced, and there is no additional chemical contamination of palladium.

1 cl, 2 dwg, 4 tbl