Processes for extraction of nickel with iron-complexing agent

Details Processes for extraction of nickel with iron-complexing agent Processes for extraction of nickel with iron-complexing agent

C - Chemistry, Metallurgy

22

B

C22B 23/06 (2006.01) C22B 3/04 (2006.01) C22B 3/14 (2006.01)

Patent

CA 2761731

The invention provides, in part, a process for extracting nickel from a source material including iron and nickel, by contacting the source material (e.g, an ultramafic ore) with an aqueous ammonia solution containing an iron-complexing agent (e.g., citrate) under suitable conditions, thereby extracting the nickel. The aqueous ammonia solution may optionally contain a sulfur-containing reductant, such as thiosulfate.

L'invention concerne, en partie, un procédé d'extraction de nickel à partir d'un matériau source contenant du fer et du nickel, par mise en contact du matériau source (p. ex. un minerai ultrabasique) avec une solution aqueuse d'ammoniac contenant un agent complexant le fer (p. ex. citrate) dans des conditions appropriées, ce qui permet d'extraire le nickel. La solution aqueuse d'ammoniac peut éventuellement contenir un réducteur contenant du soufre, tel que le thiosulfate.

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