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High-temperature cyanide leaching of platinum-group metals from automobile catalysts - laboratory tests.

Authors
Desmond-DP; Atkinson-GB; Kuczynski-RJ; Walters-LA
Source
Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 9384, 1991 Jan; :1-8
Link
NIOSHTIC No.
10011044
Abstract
The U.S. Bureau of Mines investigated leaching automobile catalysts with sodium cyanide (nacn) solutions at high temperatures to recover platinum-group metals (PGM). The feed was virgin monolith rejects, used monolith, and used pellet catalysts. Leaching with a 5-pct nacn solution for 1 h at 160 deg. C dissolved over 97 pct of the PGM in the virgin monolith, over 85 pct of the PGM in the used monolith, and over 90 pct of the PGM in the used pellet catalyst. Over 99.8 pct of the dissolved PGM was recovered as a precipitate by heating the solution to 250 deg. C for 1 h in an autoclave. The cyanide complexes were decomposed, and free cyanide was destroyed.
Keywords
Chemical-reactions; Catalysts; Cyanide; Exhaust-systems; Catalytic-effects; Waste-processing; Leaching; High-temperature; Catalytic-converters; Platinum; Materials-recovery
Publication Date
19910101
Document Type
IH; Report of Investigations
Fiscal Year
1991
NTIS Accession No.
PB92-157288
NTIS Price
A03
Identifying No.
RI-9384
NIOSH Division
RERC
Source Name
Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 9384
State
NV
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