C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/224
C22B 1/11 (2006.01) C22B 3/04 (2006.01) C22B 3/08 (2006.01) C22B 11/00 (2006.01) C22B 11/08 (2006.01)
Patent
CA 2016640
4LH ABR 5080.1 PATENT PROCESS FOR RECOVERY OF GOLD FROM REFRACTORY ORES Abstract of the Disclosure The present invention is directed to an improvement in a process for the recovery of gold from refractory sulfidic auriferous ores. The process comprises treatment of a slurry of the ore with sulfuric acid, oxidizing the treated slurry with oxygen gas under pressure in the presence of sulfuric acid, neutralizing the oxidized slurry, cyanidizing the neutralized slurry to leach gold therefrom, and recovering gold from the resultant leachate. In accordance with the improvement, the oxidized slurry is contacted with wash water in an oxidized pulp washing stage, wash water as introduced into the pulp washing stage being at a temperature lower than that of the oxidized slurry. A partial liquid/solids separation is effected within the washing stage, and a relatively high solids fraction comprising washed oxidized slurry and a liquid fraction comprising spent wash liquor are separately removed from the washing stage. The spent wash liquor is neutralized by mixing it with a base which forms a substantially insoluble sulfate salt upon reaction with sulfuric acid, after which the neutralized wash liquor is cooled. Precipitation solids are separated from the neutralized spent wash liquor and the cooled neutralized wash liquor is recycled to the pulp washing stage to provide wash water for contacting the oxidized slurry.
Fraser Kevin S.
Thomas Kenneth G.
American Barrick Resources Corporation Canada
Barrick Gold Corporation/societe Aurifere Barrick
Smart & Biggar
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