Process for the recovery of nickel

C - Chemistry – Metallurgy – 22 – B

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C22B 3/30 (2006.01) C01G 53/00 (2006.01) C22B 23/00 (2006.01)

Patent

CA 2252592

A process for the recovery of nickel from a nickel containing ore in which the ore, particularly a laterite ore, is initially leached with an aqueous acid solution, after which the nickel is precipitated as nickel hydroxide by adding a hydroxide to the aqueous acid leach solution containing the nickel, followed by a re-leaching of the nickel with an aqueous ammoniacal solution and recovery of the nickel by a solvent extraction of the nickel from the aqueous ammoniacal solution with an organic phase of a water insoluble oxime extractant dissolved in a water-immiscible hydrocarbon solvent and the nickel recovered by electrowinning the nickel from the aqueous acid stripping solution employed to strip the nickel from the organic phase.

L'invention se rapporte à un procédé de récupération de nickel à partir d'un minerai, notamment d'un minerai de latérite. Ce minerai est d'abord lixivié avec une solution acide aqueuse, puis le nickel est précipité sous forme d'hydroxyde de nickel par addition d'un hydroxyde à la solution acide aqueuse de lixiviation renfermant le nickel; le nickel est ensuite lixivié à nouveau avec une solution ammoniacale aqueuse et est récupéré de cette solution par extraction par solvant avec une phase organique d'un produit d'épuisement oxime insoluble dans l'eau, dissous dans un solvant d'hydrocarbure non miscible à l'eau, et le nickel est récupéré par extraction électrolytique à partir de la solution acide aqueuse de stripage utilisée pour extraire le nickel de la phase organique.

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