Process for removing and recovering copper, silver and zinc...

Details Process for removing and recovering copper, silver and zinc... Process for removing and recovering copper, silver and zinc...

C - Chemistry, Metallurgy

22

B

C22B 3/14 (2006.01)

Patent

CA 2193305

Ores containing copper, zinc, silver in the form of sulfides are treated by a solution of sulfurated sulfite ions and ammonium ions in order to remove most of the metals from the sulfide ores. This treatment renders the resulting gold bearing ores much more amendable to cyanide extraction. Dissolved metals are reclaimed by appropriate techniques, such as electrowinning or liquid-liquid extraction, and the solution of sulfurated sulfites and ammonia is recycled for further lixiviation of fresh ores.

Les minerais contenant des sulfures de cuivre, de zinc et d'argent sont traités avec une solution d'ions sulfite sulfurés et d'ions ammonium afin d'enlever la plupart des métaux des minerais sulfurés. Les minerais restants se prêtent alors beaucoup mieux à l'extraction au cyanure de l'or qu'ils contiennent. Les métaux dissous sont récupérés au moyen de techniques appropriées, comme l'extraction électrolytique ou liquide-liquide, et la solution de sulfites sulfurés et d'ammoniaque est recyclée pour la lixiviation de nouveaux minerais.

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