METHOD OF LEACHING PALLADIUM FROM SLUDGES Russian patent published in 2006 - IPC C22B11/00 C22B3/06 C22B3/24 

FIELD: methods of treatment of circulating products containing palladium in form of metallic, oxide and metal-oxide forms.

SUBSTANCE: proposed method is used for production of stable isotopes in treatment of entrapping chambers of magnetic separators; metallurgy; processing ores and concentrates containing oxidized and native palladium and utilization of palladium-containing catalysts, as well as in analytical and preparative chemistry. Leaching is performed by solutions of nitric acid in presence of ammonium nitrate and weakly-basic anionite of epoxy-polyamine, type AH-31 at concentration of nitric acid in leaching solution from 120 to 190 g/l and ammonium nitrate from 160 to 240 g/l followed by separation of resin from pulp, washing of anionite with water from mother liquor and desorption of palladium from anionite. Proposed method increases degree of leaching palladium from sludge during one stage; method ensures obtaining pure solutions of palladium during its desorption from anionite reducing number of operations in treating the solutions for obtaining palladium or its compounds reducing the time required for conversion of palladium.

EFFECT: enhanced efficiency.

4 cl, 4 tbl, 4 ex