Method for improving nickel cathode morphology

C - Chemistry – Metallurgy – 25 – D

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C25D 3/16 (2006.01) C25C 1/08 (2006.01) C25C 7/02 (2006.01) C25D 17/10 (2006.01)

Patent

CA 2686490

An acidic aqueous electrolyte solution for production of a nickel cathode is provided which includes nickel ions, and 2,5-dimethyl-3-hexyne-2,5-diol. The 2,5- dimethyl -3-hexyne-2,5-diol may be present in the acidic aqueous electrolyte solution in an amount ranging from about 5 ppm to about 300 ppm. Also provided is a process for electrowinning or electrorefining a nickel cathode which includes providing an acidic aqueous electrolyte solution including nickel ions, and 2,5- dimethyl -3-hexyne-2,5-diol; and electrolytically depositing nickel to form a nickel cathode. Addition of 2,5- dimethyl -3-hexyne-2,5-diol results in a reduction of striations and other defects which may occur on the surface of cathodes made by electrowinning or electrorefining.

La présente invention concerne une solution électrolytique aqueuse acide utilisable en vue de la production d'une cathode de nickel et contenant des ions nickel et du 2,5-diméthyl-3-hexyne-2,5-diol. Le 2,5-diméthyl-3-hexyne-2,5-diol peut être présent dans la solution électrolytique aqueuse acide à hauteur d'environ 5 à environ 300 ppm. L'invention concerne également un procédé d'extraction électrolytique ou de raffinage électrolytique d'une cathode de nickel comprenant le recours à une solution électrolytique aqueuse acide contenant des ions nickel et du 2,5-diméthyl-3-hexyne-2,5-diol; et le dépôt électrolytique de nickel en vue de la formation d'une cathode de nickel. L'addition de 2,5-diméthyl-3-hexyne-2,5-diol a pour résultat une diminution des striations et autres défauts pouvant survenir à la surface de cathodes obtenues par extraction électrolytique ou par raffinage électrolytique.

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