Leaching process for copper concentrates containing arsenic...

C - Chemistry – Metallurgy – 22 – B

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C22B 15/00 (2006.01) C22B 3/08 (2006.01) C22B 3/26 (2006.01) C25C 1/12 (2006.01)

Patent

CA 2721709

A method of recovering copper from a copper sulfide concentrate comprising a copper arsenic sulfosalt or a copper antimony sulfosalt, using pyrite as a catalyst. The concentrate and pyrite are added to an acidic sulfate leach solution. The copper is leached from the concentrate, in the presence of an oxygen-containing gas, under conditions whereby the pyrite is substantially unoxidized. The pyrite:copper sulfide ratio of the pyrite being added to the copper sulfide present in the concentrate being added is at least 1:3. The pyrite may be maintained at a concentration in the leach solution of at least 9 grams per liter. The leached cop-per is recovered from the solution by conventional methods.

Procédé de récupération du cuivre à partir dun concentré de sulfure de cuivre comprenant un sulfosel de cuivre-arsenic ou un sulfosel de cuivre-antimoine, dans lequel de la pyrite est utilisée comme catalyseur. Le concentré et la pyrite sont ajoutés à une solution de lixiviation acide sulfatée. Le cuivre est lixivié à partir du concentré, en présence dun gaz contenant de loxygène, dans des conditions qui entraînent la désoxydation sensible de la pyrite. Le rapport de la pyrite au sulfure de cuivre de la pyrite ajoutée au sulfure de cuivre présent dans le concentré ajouté est supérieur ou égal à 1:3. La pyrite peut être maintenue à un taux de concentration supérieur ou égal à 9 grammes par litre dans la solution de lixiviation. Le cuivre lixivié est récupéré de la solution par des procédés classiques.

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