Leaching ores

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 3/08 (2006.01) C22B 3/02 (2006.01) C22B 15/00 (2006.01)

Patent

CA 2691576

A process for leaching an ore containing sulphidic copper-containing minerals is disclosed. The process includes carrying out an aerated oxidising leach of a part of the ore and causing reactions with a source of iron such as pyrite in the ore and producing an acidic leach liquor containing ferrous ions, ferric ions, and copper ions in solution. The process also includes carrying out a leach of another part of the ore using the leach liquor produced in step (a) under conditions that minimise reactions with a source of iron such as pyrite in the ore and producing a leach liquor containing copper ions in solution.

L'invention concerne un procédé de lixiviation d'un minerai contenant des minéraux contenant du cuivre sulfuré. Le procédé comprend les opérations consistant à effectuer une lixiviation oxydante aérée d'une partie du minerai et provoquer des réactions avec une source de fer telle que de la pyrite dans le minerai et produire une liqueur de lixiviation acide contenant des ions ferreux, des ions ferriques et des ions cuivre en solution. Le procédé comprend également les opérations consistant à effectuer une lixiviation d'une autre partie du minerai à l'aide de la liqueur de lixiviation obtenue à l'étape (a) dans des conditions qui rendent les réactions minimales avec une source de fer telle que la pyrite dans le minerai et produire une liqueur de lixiviation contenant des ions cuivre en solution.

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