Reduction of metal oxides in an electrolytic cell

Details Reduction of metal oxides in an electrolytic cell Reduction of metal oxides in an electrolytic cell

C - Chemistry, Metallurgy

25

C

C25C 3/28 (2006.01) C22B 5/00 (2006.01) C22B 34/12 (2006.01)

Patent

CA 2451302

A method of reducing a titanium oxide in a solid state in an electrolytic cell which includes an anode, a cathode formed at least in part from the titanium oxide, and a molten electrolyte which includes cations of a metal that is capable of chemically reducing the cathode titanium oxide, wich method includes operating the cell at a potential that is above a potential at which cations of the metal that is capable of chemically reducing the cathode titanium oxide deposit as the metal on the cathod, whereby the metal chemically reduces the cathode titanium oxide, and which method is characterised by refreshing the electrolyte and/or changing the cell potential in later stages of the operation of the cell as required having regard to the reactions occurring in the cell and the concentration of oxygen in the titanium oxide in the cell in order to produce high purity titanium.

L'invention concerne un procédé de réduction d'oxyde de titane à l'état solide dans une cellule électrolytique comportant une anode, une cathode, au moins partiellement constituées d'oxyde de titane, et un électrolyte fondu contenant des cations d'un métal pouvant réduire chimiquement l'oxyde de titane cathodique. Le procédé selon l'invention consiste à exploiter la cellule à un potentiel supérieur au potentiel auquel les cations du métal pouvant réduire chimiquement l'oxyde de titane cathodique se déposent en tant que métal sur la cathode, ledit métal réduisant chimiquement l'oxyde de titane cathodique. Ledit procédé est caractérisé en ce qu'il consiste à renouveler l'électrolyte et/ou à modifier le potentiel de la cellule dans des étapes ultérieures du fonctionnement de la cellule, en fonction des réactions survenant dans la cellule et de la concentration d'oxygène dans l'oxyde de titane de la cellule, de manière à produire du titane de pureté élevée.

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