Method for nickel and cobalt recovery from laterite ores by...

C - Chemistry – Metallurgy – 22 – B

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C22B 23/00 (2006.01) C22B 3/06 (2006.01) C22B 3/08 (2006.01) C22B 3/44 (2006.01)

Patent

CA 2572420

A process for leaching laterite ores containing limonite and saprolite. Sufficient mineral acid is added to a slurry of limonite which is leached at atmospheric pressure to dissolve most of the soluble non-ferrous metals and soluble iron. After adding saprolite the slurry is further leached at a temperature above the normal boiling point and at a pressure above atmospheric pressure for a time sufficient to leach most of the contained nickel in the saprolite and to precipitate most of the iron in solution. The pressure of the slurry is then reduced, and nickel and/or cobalt is subsequently recovered from the leach solution by solvent extraction, resin-in-~pulp or other ion exchange, sulfide or hydroxide precipitation, or other recovery method.

L'invention concerne un procédé permettant de lixivier des minerais de latérite contenant une limonite et une saprolite. On ajoute suffisamment d'acide minéral à un coulis de limonite qui est lixivié à pression atmosphérique afin de dissoudre la plus grande partie des métaux solubles non ferreux et du fer soluble. Après adjonction de saprolite, le coulis est ensuite lixivié à une température supérieure au point d'ébullition normal et à une pression supérieure à la pression atmosphérique pendant une durée suffisante pour lixivier la plus gande partie du nickel contenu dans la saprolite et pour précipiter la plus grande partie du fer dans une solution. Puis, on réduit la pression du coulis, et on récupère le nickel et/ou le cobalt de la solution de lixiviation par extraction par solvant, traitement de résine en pulpe ou autre échange ionique, par précipitation d'un sulfure ou d'un hydroxyde ou par un autre procédé de récupération.

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