Method for purifying nickel sulfate with acid extractant

Details Method for purifying nickel sulfate with acid extractant Method for purifying nickel sulfate with acid extractant

C - Chemistry, Metallurgy

22

B

C22B 3/26 (2006.01) C01G 53/10 (2006.01)

Patent

CA 2236124

Provided is a method of efficiently producing a high-purity nickel sulfate solution through solvent extraction using an organic acid extractant. In the method, nickel is extracted into the extractant while removing sodium, ammonium and other impurities from the resulting, nickel-containing organic phase. The method comprises extracting nickel from a crude nickel sulfate solution into an organic acid extractant within a pH range falling between 6.0 and 7.0 while the nickel content of the organic phase is kept to be from 0.5 to 1.7 times the stoichiometric nickel loading capacity of the extractant, and then scrubbing the nickel-loaded, organic phase followed by stripping it with sulfuric acid.

Divulgation d'une méthode de production efficace d'une solution de sulfate de nickel d'une grande pureté au moyen de l'extraction par solvant, soit un solvant extractif à base d'acide organique. Pendant l'application de la méthode, le nickel est extrait dans le solvant extractif, en même temps que sont éliminés le sodium, l'ammonium et d'autres impuretés de la phase organique contenant du nickel résultante. La méthode consiste à extraire du nickel d'une solution brute de sulfate de nickel dans un solvant extractif à base d'acide organique, le pH étant fixé entre 6,0 et 7,0, pendant que la quantité de nickel dans la phase organique est maintenue à 0,5-1,7 fois la capacité stoechiométrique de rétention du nickel par le solvant extractif, puis à laver la phase organique chargée de nickel et à l'épurer avec de l'acide sulfurique.

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