Method for recovering copper from a copper sulphide ore

C - Chemistry – Metallurgy – 22 – B

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

Patent

CA 2642673

The invention relates to a method whereby copper is recovered from a copper sulphide ore containing pyrite. According to the method the ore is ground and leached into a solution containing sulphuric acid in atmospheric conditions by means of trivalent copper. As the copper sulphide leaches out, the trivalent iron is reduced to divalent and is oxidised back to trivalent by means of oxygen during leaching. Leaching is carried out in a closed reactor, where the undissolved gas rising from the solution in the upper section of the reactor is circulated back into the suspension of solution, solids and gas. Leaching is performed in the presence of both divalent and trivalent iron and preferably with the dissolved copper acting as a catalyst to promote leaching. The conditions are adjusted to be such that the pyrite of the ore essentially does not dissolve.

L'invention concerne un procédé qui permet de récupérer le cuivre à partir d'un sulfure de cuivre contenant de la pyrite. Selon ce procédé, le minerai est concassé puis lessivé dans une solution contenant de l'acide sulfurique dans des conditions atmosphériques au moyen du cuivre trivalent. A mesure que s'effectue le lessivage du sulfure, le fer trivalent est réduit en fer divalent puis réoxydé en fer trivalent avec de l'oxygène pendant le lessivage. Le lessivage est effectué dans un réacteur fermé, le gaz non dissous se dégageant de la solution dans la partie supérieure du réacteur étant renvoyé dans la partie dans la suspension de solution, de solide et de gaz. Le lessivage est effectué en présence de fer divalent et de fer trivalent, avec de préférence du cuivre dissous fonctionnant comme un catalyseur destiné à promouvoir le lessivage. Les conditions sont ajustées pour faire en sorte que la pyrite ou le minerai ne soit pas sensiblement dissous.

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