Precious metal recovery using thiocyanate lixiviant

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

C - Chemistry, Metallurgy

22

B

C22B 11/08 (2006.01) C22B 3/04 (2006.01) C22B 3/24 (2006.01) C22B 11/00 (2006.01)

Patent

CA 2693271

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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