Cyanide leaching chemistry of platinum-group metals.
Sibrell-PL; Atkinson-GB; Walters-LA
Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 9507, 1994 Jan; :1-12
Previous research by the U.S. Bureau of Mines has shown that autoclave cyanide leaching of used automobiles exhaust catalysts for recovery of platinum group metals (PGM) is technically feasible. The purpose of this work was to investigate the chemistry of the dissolution of PGM in cyanide solutions, in more detail. Where possible, samples of pure, elemental PGM powders or foils were used instead of automobile exhaust catalysts, because of their greater purity. Leaching rate studies showed that the rate of solubilization was greatest for Pd, followed by Pt and Rh. Although the rate of chemical reaction was the controlling step for the dissolution of elemental Pt and Rh samples, the rate diffusion was rate limiting for PGM in catalyst samples.
Cyaniding-beneficiation; Automobiles; Chemical-reactions; Catalysts; Waste-processing; Palladium; Rhodium; Metals; Reaction-kinetics; Platinum; Leaching; Catalytic-converters; Materials-recovery
Report of Investigations
NTIS Accession No.
Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 9507