A carbon electrode and a method for producing such an electrode

C - Chemistry – Metallurgy – 25 – B

Patent

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C25B 11/12 (2006.01) C25C 3/12 (2006.01) C25C 7/02 (2006.01) H05B 7/085 (2006.01)

Patent

CA 2382685

The present invention concerns an improved carbon electrode and a method for producing such a carbon electrode. In particular, the present invention relates to anodes for use in connection with electrolytic production of aluminium in accordance with the Hall-Héroult process. The anisotropy in a vibrated carbon anode results in partially significant differences in the physical properties depending on how the samples are oriented in relation to the vibration direction, in particular with regard to electrical resistance. For a tested, typical quality electrode, the resistance perpendicular to the vibration direction is 8.3 % lower than in the vibration direction. If this is utilised by placing the nipple or suspension hanger holes so that the direction of electric current flow when the electrode is in use in the electrolysis is substantially 90~ to the vibration/compression direction, this can produce a reduction of approximately 0.31 % in power consumption.

La présente invention concerne une électrode de carbone améliorée et un procédé de production d'une telle électrode de carbone. En particulier, cette invention concerne des anodes utilisées lors de la production électrolytique d'aluminium selon le procédé d'Hall-Héroult. L'anisotropie dans une anode de carbone vibrée débouche sur des différences partiellement importantes des propriétés physiques selon l'orientation des échantillons par rapport au sens de vibration, notamment en fonction de la résistance électrique. Pour une électrode de qualité typique, testée, la résistance perpendiculaire par rapport au sens de vibration est inférieure de 8,3 % à celle du sens de vibration. Si ceci est utilisé par disposition du raccord ou des trous de support de suspension, de manière que lorsque l'électrode est utilisée dans l'électrolyse, le sens d'écoulement du courant électrique est pratiquement de 90· par rapport au sens de compression/vibration, ce qui produit une réduction de la consommation d'énergie d'environ 0,31 %.

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