Method for recovering gold

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 3/10 (2006.01) C22B 11/00 (2006.01)

Patent

CA 2564338

The invention relates to a method for recovering gold from an intermediate product or residue containing sulphur and iron generated in the leaching of a sulphidic raw material. The recovery of gold and the other valuable metals in the raw material takes place in a chloride environment. The gold contained in the intermediate product or residue is leached with divalent copper and chlorine in a copper (11) chloride - sodium chloride solution in conditions where the oxidation-reduction potential is in the range of 650-750 mV and the pH between 1 and 1.6. The acid generated during the feed of chlorine is neutralized with a suitable alkali. Neutralization avoids the costs of dissolving the iron.

L'invention porte sur un procédé de récupération d'or à partir d'un produit intermédiaire ou de résidus contenant du soufre et du fer, produits lors de la lixivation d'un matériau brut cuivreux associée à la production hydrométallurgique de cuivre. La récupération du cuivre et de l'or se fait dans un environnent de chlorure. L'or présent dans le produit intermédiaire ou les résidus est lixivé avec le cuivre divalent et le chlore dans une solution de chlorure de cuivre (II) et de chlorure de sodium dans des conditions où le potentiel d'oxydation-réduction est compris entre 650 et 750 mV et le pH entre 1 et 1,6. L'acide résultant de l'apport en chlore est neutralisé par l'oxychlorure de cuivre (II) produit pendant le processus.

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