Electrolytic reduction of metal oxides such as titanium...

C - Chemistry – Metallurgy – 22 – B

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C22B 34/12 (2006.01) C22B 5/00 (2006.01) C22B 5/02 (2006.01) C25C 3/00 (2006.01) C25C 3/28 (2006.01) C25F 1/16 (2006.01) C22B 4/06 (2006.01)

Patent

CA 2401034

A method of removing oxygen from a solid metal, metal compound or semi-metal M1O by electrolysis in a fused salt of M2Y or a mixture of salts, which comprises conducting electrolysis under conditions such that reaction of oxygen rather than M2 deposition occurs at an electrode surface and that oxygen dissolves in the electrolyte M2Y and wherein, M1O is in the form of (sintered) granules or is in the form of a powder which is continuously fed into the fused salt. Also disclosed is a method of producing a metal foam comprising the steps of fabricating a foam-like metal oxide preform, removing oxygen from said foam structured metal oxide preform by electrolysis in a fused salt of M2Y or a mixture of salts, which comprises conducting electrolysis under conditions such that reaction of oxygen rather than M2 deposition occurs at an electrode surface. The method is advantageously applied for the production of titanium from Ti-dioxide.

L'invention concerne un procédé d'élimination de l'oxygène d'un métal solide, d'un composé métallique ou d'un semi-métal M1O par électrolyse en sel fondu de M2Y ou d'un mélange de sels, consistant à mener l'électrolyse sous des conditions telles qu'il y ait plutôt réaction de l'oxygène, que dépôt de M2, à la surface d'une électrode et que l'oxygène se dissolve dans l'électrolyte M2Y. Dans ce procédé, M1O est sous la forme de granules frittées, ou sous la forme d'une poudre introduite de manière continue dans le sel fondu. L'invention concerne aussi un procédé de production d'une mousse métallique consistant à fabriquer une préforme d'oxyde métallique, de type mousse, et à éliminer l'oxygène de cette préforme d'oxyde métallique à structure de mousse dans un sel fondu de M2Y ou d'un mélange de sels, par conduite de l'électrolyse sous des conditions telles que se produise une réaction de l'oxygène à la surface d'une électrode plutôt que le dépôt de M2. Le procédé de l'invention est avantageusement appliqué à la production de titane à partir de dioxyde de titane.

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