Method for recovering nickel from high magnesium-containing...

C - Chemistry – Metallurgy – 22 – B

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C22B 3/42 (2006.01) C22B 26/22 (2006.01)

Patent

CA 2224218

A method is provided for recovering nickel from high magnesium-containing lateritic ores which also contain iron. The ores which are referred to as saprolitic ores are subjected to leaching (2) with a mineral acid from the group consisting of HC1, H2SO4 and HNO3, HC1 being preferred. Following leaching with HC1, for example, the pregnant solution obtained is separated from undissolved solids and the nickel preferably recovered by contacting the solution with a resin (4) selective to nickel absorption. The raffinate remaining which contains iron and magnesium chlorides may be subjected to pyro-hydrolysis (10A) to produce their respective oxides and free HC1 for recycle into the leaching system. The nickel is extracted from the resin using a stripping solution of the acid, and the nickel thereafter extracted from the nickel-loaded stripping solution.

Technique de récupération de nickel dans un minerai latéritique à forte teneur en magnésium et contenant aussi du fer. Le minerai, qualifié de saprolithique, est soumis à une lixiviation (2) par un acide minéral choisi dans le groupe constitué par HCl, H2SO4 et HNO3, HCl l'acide préféré. Après lixiviation au HCl, par exemple, le jus fort obtenu est séparé des matières solides non dissoutes et le nickel est récupéré de préférence par mise en contact du jus avec une résine (4) susceptible d'absorption sélective du nickel. Le produit raffiné restant, qui contient des chlorures de fer et de magnésium, peut être soumis à une pyrohydrolyse (10A) qui produit des oxydes de ces deux métaux et libère du HCl pouvant être recyclé lors de l'opération de lixiviation. Pour séparer le nickel de la résine, on fait appel à une solution d'extraction de l'acide, le nickel étant ensuite extrait de cette solution, chargée de nickel.

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