Precious metal recovery using thiocyanate lixiviant

Details Precious metal recovery using thiocyanate lixiviant Precious metal recovery using thiocyanate lixiviant

2007-10-23

2007-10-23

Langel, Wayne A. (Department: 1754)

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Platinum group metal

C423S029000

Reexamination Certificate

active

10651184

ABSTRACT:
Precious metal-containing mineral material is subjected to an acidic thiocyanate leach to dissolve the precious metal as a precious metal-thiocyanate complex. A feed of the thiocyanate leach solution may include a large molar ratio of ferric iron to thiocyanate. Precious metal may be removed from pregnant thiocyanate leach solution, such as by transferring precious metal from precious metal-thiocyanate complex to precious metal-cyanide complex and then loading the precious metal-cyanide complex onto an adsorbent material. Remaining cyanide in the thiocyanate leach solution may be converted to thiocyanate for additional leaching of precious metal.

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