Process of treating gold-containing sulfide ores

C - Chemistry – Metallurgy – 22 – B

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C22B 1/02 (2006.01) C22B 11/00 (2006.01)

Patent

CA 2199534

The ore which contains gold and at least one of the metals silver, copper, nickel, zinc or iron is calcined at temperatures in the range from 500 to 900°C with the addition of oxygen-containing gas, thereby producing a metal-oxide-containing solids mixture and a SO2-containing exhaust gas. The SO2-containing exhaust gas is brought in contact with aqueous solution, thereby producing a sulfite-containing solution. The solids mixture from the calcination is cooled to temperatures in the range from 50 to 300°C and is stirred up with the sulfite-containing solution. Metal oxides are dissolved, and a sulfate-containing solution is formed. In a first separating zone, the sulfate-containing solution is separated from the solids, and either the solids are supplied to a gold leaching or the sulfate-containing solution is subjected to a further treatment for the separation of non-ferrous metals.

Un minerai renfermant de l'or et au moins l'un des métaux parmi l'argent, le cuivre, le nickel, le zinc ou le fer, est calciné à des températures se situant dans une plage de 500 à 900 °C, avec addition de gaz contenant de l'oxygène, pour la production d'un mélange solide renfermant des oxydes métalliques, et d'un gaz d'échappement contenant du SO2. Le gaz d'échappement est mis en contact avec la solution aqueuse, produisant ainsi une solution de sulfite. Le mélange solide provenant de la calcination est refroidi à des températures se situant dans une plage de 50 à 300 °C, et brassé avec la solution de sulfite. Les oxydes métalliques sont dissous et il y a formation d'une solution renfermant du sulfate. Cette dernière solution est séparée des solides dans une première zone de séparation; les solides sont dirigés vers une installation de lixiviation de l'or, ou alors la solution de sulfate est soumise à un traitement supplémentaire pour la séparation des métaux non ferreux.

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