A method for the bacterially assisted heap leaching of...

C - Chemistry – Metallurgy – 22 – B

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C22B 3/18 (2006.01) C22B 3/00 (2006.01) C22B 15/00 (2006.01)

Patent

CA 2438605

A method for the bacterially assisted heap leaching of chalcopyrite, the method characterised by the steps of: providing a chalcopyrite containing ore heap to oxidise sulphide minerals therein, the heap containing and/or being inoculated with a sulphide oxidising bacterial culture that either does not oxidise ferrous to ferric, or is inefficient at doing so; providing at least a first leach solution pond (or other suitable container), from which feed solution is fed to the heap, and which receives leach solution from the heap; andbleeding a portion of the leach solution and passing same to a means for metals recovery.

L'invention concerne un procédé destiné à la lixiviation en tas assistée sur le plan bactérien de chalcopyrite. Ce procédé est caractérisé par les étapes consistant: à utiliser un chalcopyrite renfermant un tas de minerais aux fins d'oxydation de minéraux de sulfure, le tas renfermant une culture bactérienne d'oxydation de sulfure n'oxydant pas des matériaux ferreux en matériaux ferriques ou étant inefficace pour une telle tâche, et/ou étant inoculé au moyen d'une telle solution; à utiliser au moins un premier bassin de solution de jus d'attaque (ou un autre contenant approprié), à partir duquel une solution d'alimentation est alimentée dans le tas et recevant une solution de jus d'attaque à partir du tas; et à purger une partie de la solution du jus d'attaque et à la passer à des moyens destinés à la récupération des métaux.

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