CPC C22B 11/04 (2013.01) [C22B 3/42 (2013.01)] | 20 Claims |
1. A process, comprising:
a) providing a particulate carbon-based material comprising one or more of activated carbon, activated charcoal, coke, hard carbon derived from at least one of coconut shells and elemental carbon, a calcined resin, and mixtures thereof;
b) providing a precious metal-bearing material;
c) contacting the precious metal-bearing material with the particulate carbon-based material, thiosulfate, an anion exchange resin, and an oxidant to form a slurry comprising a slurried precious metal-bearing material, wherein a weight ratio of the precious metal-bearing material to particulate carbon-based material is more than 125:1; and
d) leaching a precious metal from the slurried precious metal-bearing material to form a leached precious metal-bearing material, wherein the anion exchange resin has a greater affinity for the leached precious metal than the particulate carbon-based material.
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