Recovery of nickel from bioleach solution

C - Chemistry – Metallurgy – 22 – B

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C22B 3/18 (2006.01)

Patent

CA 2270079

A bioleaching method is provided for recovering a nickel from an ore selected from the group consisting nickel-containing lateritic ores and nickel-containing sulfidic ores or concentrates thereof. Where the ore selected is a nickel-containing lateritic ore, at least one micro-organism selective to the leaching of the lateritic ore is provided as an aqueous solution thereof maintained at a pH ranging from about 1 to 3 including a nutrient for the micro-organism. The ore either as a slurry, a heap, or a charge in a vat is bioleached for a time sufficient to effect the dissolution of the nickel in the ore and form a solution thereof and a residue which is separated from the solution. The nickel is then selectively extracted from the solution using an ion exchange resin, and the nickel thereafter extracted from the resin using a mineral acid.

Procédé de lixiviation biologique pour extraire le nickel d'un minerai sélectionné dans le groupe comprenant les minerais latéritiques contenant du nickel et les minerais sulfurés contenant du nickel, ou des concentrés de ces derniers. Lorsque le minerai sélectionné est un minerai latéritique contenant du nickel, on utilise au moins un micro-organisme agissant sélectivement sur la lixiviation du minerai latéritique, dans une solution aqueuse maintenue à un pH compris entre 1 et 3 et comprenant un nutriment pour le micro-organisme. Le minerai est soumis à la lixiviation biologique sous forme de pulpe, de tas ou de charge dans une cuve, pendant une durée suffisante pour provoquer la dissolution du nickel dans le minerai et former une solution de ce dernier, ainsi qu'un résidu qui est séparé de la solution. Le nickel est ensuite extrait sélectivement de la solution au moyen d'une résine échangeuse d'ions, après quoi le nickel est extrait de la résine au moyen d'un acide minéral.

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