Oxidative and anoxic extraction of metals from sulphide...

C - Chemistry – Metallurgy – 22 – B

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C22B 3/06 (2006.01) C01G 53/00 (2006.01) C22B 7/00 (2006.01) C22B 23/06 (2006.01) C25C 1/08 (2006.01) C25C 7/02 (2006.01) C25C 7/06 (2006.01)

Patent

CA 2662588

Nickel entrained in the sulphide mineral pyrrhotite is engineered to dissolve in leaching acid in a two step procedure. First, a slurry of the mineral and the acid is activated by oxidation. This is done in a time Tl by electrolysis; or alternatively chemically, by adding e.g an oxidising acid to the mineral. After activation, the slurry is then kept under anoxic conditions for a time T2. During T2, the sulphide starts to dissolve much more rapidly, and the rapid breakdown of the sulphide enables the nickel to dissolve and thus to be leached out of the mineral. The dissolved nickel is extracted from the leaching acid e.g by electro-winning.

Du nickel entraîné dans le minéral sulfuré tel que la pyrrhotine est modifié afin de se dissoudre dans de l'acide de lixiviation dans une procédure à deux étapes. Tout d'abord, une suspension épaisse du minéral et de l'acide est activée par oxydation. Ladite étape est mise en oeuvre à un moment T1 par électrolyse; ou dans une variante, chimiquement, par addition, par exemple, d'un acide oxydant au minéral. Après activation, la suspension épaisse est conservée dans des conditions anoxiques pendant un temps T2. Pendant le temps T2, le sulfure commence à se dissoudre beaucoup plus rapidement, et la dégradation rapide du sulfure permet au nickel de se dissoudre et d'être ainsi lixivié du minéral. Le nickel dissous est extrait de l'acide de lixiviation par exemple par extraction par voie électrolytique.

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