Electrochemical reduction of metal oxides

C - Chemistry – Metallurgy – 25 – C

Patent

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C25C 5/00 (2006.01) C22B 9/14 (2006.01) C22B 34/12 (2006.01)

Patent

CA 2529786

An electrolytic cell for electrochemically reducing metal oxide powders and/or pellets is disclosed. The cell includes a cathode (25) in the form of a plate that has an upper surface for supporting metal oxide powders and/or pellets. The plate is horizontally disposed or slightly inclined and has a forward end and a rearward end and is immersed in an electrolyte bath. The plate is supported for movement so as to cause metal oxide powders and/or pellets on the upper surface of the plate to move toward a forward end of the plate. The cell also includes a means for causing metal oxide powders and/or pellets to move over the upper surface of the plate toward the forward end of the cathode while in contact with molten electrolyte whereby electrochemical reduction of the metal oxide to metal can occur. A method of continuously or semi- continuously reducing metal oxide powders and/or pellets in the cell is also disclosed.

L'invention concerne une cellule électrolytique de réduction électrochimique de poudres et/ou de pastilles d'oxyde métallique. Ladite cellule comprend une cathode (25) sous forme de plaque présentant une surface supérieure de support des poudres et/ou des pastilles d'oxyde métallique. La plaque est horizontalement disposée ou légèrement inclinée, comprend une extrémité avant et une extrémité arrière, et est immergée dans un bain électrolytique. La plaque comprend un support facilitant le mouvement, permettant aux poudres et/ou aux pastilles d'oxyde métallique de la surface supérieure de la plaque de se déplacer vers une extrémité avant de la plaque. La cellule comprend également des moyens permettant aux poudres et/ou aux pastilles d'oxyde métallique situées sur la surface supérieure de la plaque de se déplacer vers l'extrémité avant de la cathode, tout en restant en contact avec un électrolyte fondu, afin de permettre la réduction électrochimique de l'oxyde métallique. L'invention concerne également un procédé de réduction continue ou semi-continue de poudres et/ou de pastilles d'oxyde métallique dans la cellule.

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