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Cyanide Leaching Chemistry of Platinum-Group Metals.

PB94189362

Publication Date	1994
Personal Author	Sibrell, P. L.; Atkinson, G. B.; Walters, L. A.
Page Count	18
Abstract	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.
Keywords	Platinum Leaching Catalytic converters Materials recovery Cyaniding(Beneficiation) Automobiles Chemical reactions Catalysts Waste processing Palladium Rhodium Metals Reaction kinetics PGM(Platinum group metals)
Source Agency	Bureau of Mines
NTIS Subject Category	68C - Solid Wastes Pollution & Control 85H - Road Transportation 48A - Mineral Industries 71N - Nonferrous Metals & Alloys 99B - Industrial Chemistry & Chemical Process Engineering
Corporate Authors	Bureau of Mines, Reno, NV. Reno Research Center.
Supplemental Notes	See also PB92-157288 and PB93-188100.
Document Type	Technical Report
Title Note	Rept. of investigations/1994.
NTIS Issue Number	199419

Cyanide Leaching Chemistry of Platinum-Group Metals.

Cyanide Leaching Chemistry of Platinum-Group Metals.
PB94189362

Publication Date	1994
Personal Author	Sibrell, P. L.; Atkinson, G. B.; Walters, L. A.
Page Count	18
Abstract	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.
Keywords	Platinum Leaching Catalytic converters Materials recovery Cyaniding(Beneficiation) Automobiles Chemical reactions Catalysts Waste processing Palladium Rhodium Metals Reaction kinetics PGM(Platinum group metals)
Source Agency	Bureau of Mines
NTIS Subject Category	68C - Solid Wastes Pollution & Control 85H - Road Transportation 48A - Mineral Industries 71N - Nonferrous Metals & Alloys 99B - Industrial Chemistry & Chemical Process Engineering
Corporate Authors	Bureau of Mines, Reno, NV. Reno Research Center.
Supplemental Notes	See also PB92-157288 and PB93-188100.
Document Type	Technical Report
Title Note	Rept. of investigations/1994.
NTIS Issue Number	199419