Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Platinum group metal
Patent
1992-03-03
1994-04-19
Langel, Wayne
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Platinum group metal
423 38, 423522, C01G 5500, C22B 1100
Patent
active
053043596
ABSTRACT:
A method is provided for the dissolution of at least one precious metal selected from the group consisting of platinum group metals, gold and silver. The method comprises subjecting a material containing at least one of the precious metals to dissolution with a sulfuric acid solution maintained at a pH at least sufficient to complex the precious metal with bromide ions in the presence of an oxidizing agent, the amount of bromide ions in the solution being at least sufficient to form a soluble complex of the precious metal. The amount of oxidizing agent is at least sufficient to maintain a redox potential at least high enough to convert the precious metal to an ionic form conducive to forming a soluble bromide complex thereof.
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Duyvesteyn Saskia
Duyvesteyn Willem D. C.
Liu Houyuan
BHP Minerals International Inc.
Bos Steven
Langel Wayne
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