Method for recovering gold

Details Method for recovering gold Method for recovering gold

C - Chemistry, Metallurgy

22

B

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

Patent

CA 2642618

The invention relates to a method for recovering gold in connection with the hydrometallurgical production of copper from a waste or intermediate product containing sulphur and iron that is generated in the leaching of the copper raw material. The recovery of both copper and gold occurs in a chloride environment. The gold contained in the waste or intermediate is leached by means of divalent copper, oxygen and alkali bromide in a solution of copper (II) chloride and alkali chloride, in conditions where the oxygen-reduction potential is a maximum of 650 mV and the pH a minimum of 0.5. The bromide accelerates the dissolution of the gold.

L'invention concerne un procédé pour récupérer l'or dans le cadre de la production hydrométallurgique de cuivre à partir de déchets ou de produits intermédiaires contenant du soufre et du fer, obtenus lors du lessivage des matières premières de cuivre. La récupération de l'or et du cuivre se fait dans un environnement de chlorure. L'or contenu dans les déchets ou les produits intermédiaires est lessivé au moyen du cuivre divalent, de l'oxygène et du bromure alcalin dans une solution de chlorure de cuivre (II) et de chlorure alcalin, dans des conditions où le potentiel de réduction d'oxygène a un maximum de 650 mV et le pH a un minimum de 0,5. Le bromure accélère la dissolution de l'or.

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