Method for processing pyritic concentrate containing gold,...

C - Chemistry – Metallurgy – 22 – B

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C22B 3/00 (2006.01) C22B 11/00 (2006.01) C22B 15/00 (2006.01) C22B 30/04 (2006.01)

Patent

CA 2706414

The invention relates to a method for processing pyritic copper sulphide concentrate, in which, in addition to copper, there is arsenic and gold bound to the sulphide minerals, or invisible gold. In the method concentrate is leached into a chloride-containing solution. Raw material leaching is performed in conditions where the copper, iron and arsenic of the raw material dissolve, but the gold-containing material remains undissolved. The chloride solution obtained is routed to neutralisation, where the iron and arsenic in it are precipitated. The purified copper solution is routed to liquid- liquid extraction, in the stripping stage of which copper is transferred to a sulphate solution, which is routed to copper electrowinning. Gold is recovered from the leaching residue by some known method.

L'invention concerne un procédé de traitement d'un concentré de sulfure de cuivre pyritique, dans lequel, outre le cuivre, il y a de l'arsenic et de l'or liés aux minéraux sulfurés, ou de l'or invisible. Dans le procédé, le concentré est lixivié dans une solution contenant un chlorure. La lixiviation du matériau brut est effectuée dans des conditions dans lesquelles le cuivre, le fer et l'arsenic du matériau brut se dissolvent, mais le matériau contenant de l'or reste non dissous. La solution de chlorure obtenue est soumise à une neutralisation, lors de laquelle sont précipités l'arsenic et le fer qu'elle contient. La solution de cuivre purifié est soumise à une extraction liquide-liquide, dans l'étape de lavage de laquelle le cuivre est transféré dans une solution de sulfate, qui est soumise à une électro-extraction du cuivre. L'or est récupéré à partir du résidu de lixiviation par un procédé connu quelconque.

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