Treatment of roasted metal sulphide ores and ferrites by...

Details Treatment of roasted metal sulphide ores and ferrites by... Treatment of roasted metal sulphide ores and ferrites by...

C - Chemistry, Metallurgy

22

B

C22B 19/20 (2006.01) C22B 1/02 (2006.01) C22B 3/08 (2006.01) C22B 15/00 (2006.01)

Patent

CA 2334511

A process for the treatment of a roasted metal sulphide ore, for the separation of metals therefrom. The process comprises leaching the roasted ore with peroxysulphuric acid, optionally in the presence of chlorine, and separating a solution containing metals. The process is particularly useful in separating copper and zinc from sulphide ores of those metals, in particular when the ore has been subjected to a dead roast or to a sulphation roast and the roasted ore contains then metal ferrites which otherwise require high acid concentrations and high leach temperatures for metal recovery therefrom.

L'invention concerne un procédé de traitement d'une pyrite métallique grillée permettant de séparer les métaux qu'elle contient. Ledit procédé consiste à lessiver le minerai grillé avec de l'acide peroxysulfurique, éventuellement en présence de chlore, et à en séparer une solution métallifère. Le procédé de l'invention est particulièrement utile pour séparer le cuivre et le zinc des pyrites de ces métaux, notamment lorsque le minerai a été soumis à un grillage à mort ou à un grillage sulfateur et lorsque le minerai grillé contient des ferrites métalliques nécessitant, en temps normal, des concentrations d'acide et des températures de lessivage élevées pour l'extraction de ces métaux.

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