Title:
PRECIOUS METAL RECOVERY USING THIOCYANATE LIXIVIANT
Document Type and Number:
WIPO Patent Application WO2004092448
Kind Code:
A3
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.
Inventors:
WAN RONG YU (US)
LEVIER K MARC (US)
LEVIER K MARC (US)
Application Number:
PCT/US2004/009213
Publication Date:
December 29, 2005
Filing Date:
March 25, 2004
Export Citation:
Assignee:
NEWMONT USA LTD (US)
WAN RONG YU (US)
LEVIER K MARC (US)
WAN RONG YU (US)
LEVIER K MARC (US)
International Classes:
C22B11/08; C22B15/00; (IPC1-7): C22B11/08
Foreign References:
| US5061459A | 1991-10-29 | |||
| US5885327A | 1999-03-23 | |||
| US6355175B1 | 2002-03-12 |
Other References:
See also references of EP 1629129A4
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