Recovery of precious metals from refractory material

Details Recovery of precious metals from refractory material Recovery of precious metals from refractory material

C - Chemistry, Metallurgy

22

B

53/168, 53/224

C22B 11/04 (1980.01)

Patent

CA 1080481

ABSTRACT OF THE DISCLOSURE This invention relates to a process or the recovery of a precious metal such as silver or gold from a refractory material. The process comprises the steps of subjecting the material in finely divided form to treatment with an oxidizing agent in an acid solution at a temperature below 120°C and at a total pressure of from 7 to 11 kg/cm2. The resultant slurry is then treated to remove sulfur and solids containing the precious metal therefrom and the sepa- rated solids are subjected to further treatment to recover the precious metal. The preferred method of treating the separated solids is by cyanidation.

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