Process for making nickel hydroxide

C - Chemistry – Metallurgy – 01 – G

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Details

C01G 53/00 (2006.01) C01G 53/04 (2006.01) C01G 53/10 (2006.01) H01M 4/26 (2006.01)

Patent

CA 2546499

A preferred embodiment of the present invention provides a process for making nickel sulfate by converting nickel metal into nickel sulfate, which may be converted to nickel hydroxide. Nickel metal is dissolved in sulfuric acid and oxygen containing gas is introduced to produce a nickel sulfate solution having nickel sulfate and water as illustrated in the following chemical equation. Ni + H2SO4 + 1/ 2O2 .fwdarw.NiSO4 + H2O The nickel sulfate is filtered and sulfuric acid is continually added to maintain stoichiometry within a reactor until the nickel metal is dissolved. The sulfuric acid, oxygen containing gas and nickel metal may be heated to facilitate the desired reaction. Then, the nickel sulfate may be utilized to produce nickel hydroxide.

Un mode de réalisation préféré de l'invention concerne un procédé de fabrication de sulfate de nickel par conversion de nickel métallique en sulfate de nickel, qui peut être converti en hydroxyde de nickel. Le nickel métallique est dissout dans de l'acide sulfurique et un gaz contenant de l'oxygène est introduit afin de produire une solution de sulfate de nickel contenant du sulfate de nickel et de l'eau ainsi que cela est représenté par l'équation chimique suivante: Ni+H<sb>2</sb>SO<sb>4</sb>+<sp>1/</sp><sb>2</sb>O<sb>2</sb>.fwdarw.NiSO<sb>4</sb>+H<sb>2</sb>O. Le sulfate de nickel est filtré et l'acide sulfurique est ajouté de manière continue de sorte que le rapport stoechiométrique soit conservé à l'intérieur du réacteur jusqu'à ce que le nickel métallique soit dissout. L'acide sulfurique, le gaz contenant l'oxygène et le nickel métallique peuvent être chauffés pour faciliter la réaction souhaitée. Le sulfate de nickel peut ensuite être utilisé pour la production d'hydroxyde de nickel.<sp> </sp>

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