Process for refining high-impurity copper to anode copper

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 15/00 (2006.01) C22B 9/10 (2006.01) F27B 3/04 (2006.01) F27B 3/22 (2006.01)

Patent

CA 2267325

A process for refining high-impurity blister copper to anode quality copper is disclosed. In an oxidation step of a blister copper refining stage, soda ash fluxing removes antimony and arsenic while also removing sulfur and iron. In a deoxidation step of the blister copper refining stage, sulfur hexafluoride is injected at a controlled oxygen concentration to remove bismuth while reducing the oxygen content. Slag is continuously or periodically skimmed from the surface of the molten blister copper to prevent re-entry of impurities. The process may be carried out in batch operation or, in a preferred embodiment, in continuous flow-through operation.

Procédé servant à raffiner du cuivre brut contenant une quantité élevée d'impuretés afin d'obtenir un cuivre de qualité anodique. Dans une étape d'oxydation de ce procédé de raffinage du cuivre brut, un décapage à la soude calcinée permet de supprimer l'antimoine et l'arsenic, tout en supprimant également le soufre et le fer. Une étape de désoxydation consiste à injecter de l'hexafluorure de soufre à une concentration d'oxygène commandée afin de supprimer le bismuth tout en diminuant la teneur en oxygène. On écume continuellement ou périodiquement la surface du cuivre brut en fusion, de manière à enlever les scories et à empêcher une nouvelle pénétration d'impuretés. On peut mettre ce procédé en application en une opération discontinue ou, dans un mode de réalisation préféré, en une opération continue sans interruption.

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