Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Platinum group metal
Reexamination Certificate
2006-06-27
2006-06-27
Bos, Steven (Department: 1754)
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Platinum group metal
C075S744000
Reexamination Certificate
active
07067090
ABSTRACT:
This invention relates to the recovery of platinum group metals and, more particularly, to the recovery of platinum group metals from various sources by roasting the source material with one or more of sulfuric acid, a sulfate and/or a bi-sulfate and with one or more halogen salt. The roasted product is put in contact with a leaching solution to dissolve at least a portion of the platinum group metals, which then may be separated and recovered.
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P.L. Sibrell et al.. “Leaching of Petroleum Catalyst with Cyanide for Palladium Recovery,” inRecycling of Metals and Engineering Materials121-130 (P B Queneau & R D Peterson Eds TMS 1995).
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Han Kenneth N.
Kim Peter Nam-soo
Bos Steven
Gordon & Rees LLP
South Dakota School of Mines and Technology
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