Leaching process for copper concentrates

C - Chemistry – Metallurgy – 22 – B

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C22B 15/00 (2006.01) C22B 3/08 (2006.01)

Patent

CA 2566596

A method of leaching copper from copper sulphide-containing concentrates, such as chalcopyrite, includes using pyrite as a catalyst for ferric reduction in order to eliminate passivation of the chalcopyrite surface, the process being carried out under conditions whereby the pyrite is not materially oxidized, for example by maintaining the operating solution potential at a suitable level. The leaching is carried out in an acidic sulphate medium and may include oxidation by oxygen-containing gas. The leached copper is then recovered, for example by solvent extraction and electrowinning. The leaching process can result in the virtually complete extraction of copper at atmospheric pressure in as little as four hours.

La présente invention concerne un procédé de lixiviation de cuivre à partir de concentrés contenant du sulfure de cuivre, tels qu'une chalcopyrite, qui consiste à utiliser une pyrite comme catalyseur de réduction ferrique de façon à éliminer la passivation de la surface de la chalcopyrite, ce processus étant effectué dans des conditions dans lesquelles la pyrite n'est pas matériellement oxydée, par exemple par le maintien du potentiel de solution de travail à un niveau souhaitable. La lixiviation est effectuée dans un milieu de sulfate acide et peut comprendre une oxydation par un gaz contenant de l'oxygène. Le cuivre lixivié est ensuite récupéré, par exemple par extraction par solvant et par extraction électrolytique. Le processus de liquidation peut entraîner l'extraction complète virtuelle de cuivre sous pression atmosphérique en quatre heures uniquement.

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