Process for the extraction of copper

C - Chemistry – Metallurgy – 22 – B

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C22B 15/00 (2006.01) C22B 1/11 (2006.01) C22B 3/08 (2006.01)

Patent

CA 2377779

A process for the extraction of copper from a copper sulphide containing concentrate such as chalcopyrite, involves dispersing the finely divided copper sulphide containing concentrate in an aqueous sulphuric acid solution to form a slurry; providing an effective amount of a suitable surfactant such as lignosol or quebracho; reacting with agitation the slurry and surfactant with free oxygen bearing gas in a pressure vessel at an elevated temperature to extract the copper values from the concentrate to produce the final leach solution containing dissolved copper values and a solid residue; and separating the final leach solution containing the dissolved copper values from the solid residue.

Selon cette invention, un processus d'extraction de cuivre à partir d'un concentré contenant du sulfure de cuivre tel que la chalcopyrite consiste à disperser le concentré finement moulu contenant du sulfure de cuivre dans une solution aqueuse d'acide sulfurique pour former une suspension, à ajouter une quantité efficace d'un surfactant approprié tel que Lignosol ou le quebracho, à faire réagir la suspension et le surfactant avec un gaz comportant de l'oxygène libre en agitant le mélange dans une cuve sous pression et à température élevée pour extraire le cuivre de valeur du concentré afin d'obtenir une solution de lixiviation finale qui contient le cuivre de valeur dissous et un résidu solide, puis à séparer la solution de lixiviation finale contenant le cuivre de valeur du résidu solide.

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