Solvent extraction of impurity metals from a valuable metal...

C - Chemistry – Metallurgy – 22 – B

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

Patent

CA 2395457

The present invention relates generally to a method of extracting cobalt and other impurity metals from a concentrated nickel sulphate solution by a solvent extraction process whereby a cationic solvent extractant is separately pre-equilibrated with a portion of a purified nickel sulphate solution in such a manner that it is loaded with nickel without precipitating insoluble nickel double salts. The nickel loaded extracted is then transferred to an impure cobalt nickel solution where the cobalt and certain other impurity metals exchange with nickel leaving a purified concentrated nickel sulphate solution suitable for hydrogen reduction or electrowinning. The cobalt loaded extractant is stripped with dilute sulphuric acid before being recycled whilst an aqueous cobalt stripped solution is further processed to recover cobalt.

La présente invention concerne généralement un procédé permettant d'extraire le cobalt et d'autres métaux impurs d'une solution de sulfate de nickel concentrée via un processus d'extraction par solvant selon lequel on pré-équilibre séparément un solvant d'extraction cationique à l'aide d'une partie d'une solution de sulfate de nickel purifiée de façon à charger le solvant de nickel sans provoquer la précipitation de sels doubles de nickel insolubles. On transfère ensuite l'extrait chargé de nickel dans une solution impure de cobalt-nickel dans laquelle le cobalt et certains autres métaux impurs s'échangent avec le nickel, laissant une solution de sulfate de nickel concentrée purifiée appropriée à la réduction par l'hydrogène ou à l'extraction électrolytique. L'agent d'extraction chargé de cobalt est entraîné par de l'acide sulfurique dilué avant d'être recyclé tandis que la solution aqueuse d'entraînement de cobalt est soumise à un traitement supplémentaire destiné à la récupération du cobalt.

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