Method of recovering gold

Details Method of recovering gold Method of recovering gold

C - Chemistry, Metallurgy

22

B

C22B 3/26 (2006.01) C22B 11/06 (2006.01)

Patent

CA 2202063

A method comprising the steps of solvent extracting a gold bearing chlorination leach solution with DBC, scrubbing the resulting gold bearing organic phase with hydrochloric acid and reducing gold is capable of recovering gold in high purity by: (1) adjusting the concentration of hydrochloric acid in the gold bearing chlorination leach solution to 0.5 - 1.75 N before the solvent extraction and then scrubbing the resulting gold bearing organic phase with 0.25 - 0.75 N hydrochloric acid; and/or (2) performing five-stage scrubbing with hydrochloric acid by either one of the following three approaches: i) after three-stage scrubbing, centrifugal separation is effected and separation is then performed by filtration with a filter having an opening size of 0.05 - 5um, with the resulting organic phase being then subjected to two- stage scrubbing: ii) after five-stage scrubbing, centrifugal separation is effected and separation is then performed by filtration with a filter having an opening size of 0.05 - 5 um; or iii) after three-stage scrubbing, centrifugal separation is effected and separation is then performed by filtration with a filter having an opening size of 0.05 - 5 µm, with the resulting organic phase being subjected to two additional stages of scrubbing, followed by centrifugal separation and separation by filtration with a filter having and opening size of 0.05 - 5 um.

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