Gold recovery from refractory carbonaceous ores by pressure...

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 3/42 (2006.01)

Patent

CA 2209559

A process for treatment of precious metal ores in which gold is leached from an oxidized ore slurry using a thiosulfate salt lixiviant and copper catalyst. Gold and copper are subsequently loaded onto an ion exchange resin. Copper is recovered from the resin by elution with a thiosulfate solution; gold is recovered from the resin by elution with a thiocyanate colution. Gold is recovered from the eluate by precipitation, electrowinning, or cementation.

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