Solvent extraction of impurities from concentrated metal...

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 3/26 (2006.01) C22B 3/38 (2006.01) C22B 3/40 (2006.01) C22B 19/00 (2006.01) C22B 23/00 (2006.01)

Patent

CA 2444104

The present invention relates generally to a two step solvent extraction circuit to remove impurity metals of zinc and cobalt selectively from a valuable metal of nickel. In order to selectively extract zinc there must be sufficient separation between zinc and cobalt in the cyanex 272 system. Similarly for cobalt and nickel, the separation factor must be of sufficient magnitude to obtain a pure nickel product. The process for the solvent extraction of impurity metals is operated at a temperature exceeding 60~C being the maximum temperature at which solvent extraction circuits conventionally operate.

La présente invention concerne un circuit d'extraction par solvant en deux étapes utilisé pour éliminer sélectivement d'un métal intéressant comme le nickel, des métaux formant des impuretés tels que le zinc et le cobalt. Pour extraire sélectivement le zinc, une séparation suffisante entre le zinc et le cobalt doit être effectuée dans le système cyanex 272. Aussi bien pour le cobalt que le nickel, le facteur de séparation doit être suffisamment important pour obtenir un produit nickel pur. Le procédé d'extraction par solvant de métaux formant des impuretés est mis en oeuvre à une température supérieure à 60 ·C c'est-à-dire à la température maximale à laquelle les circuits d'extraction par solvant ont l'habitude de fonctionner.

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