Process for the graphitization of cathode blocks

Details Process for the graphitization of cathode blocks Process for the graphitization of cathode blocks

C - Chemistry, Metallurgy

25

C

C25C 3/08 (2006.01) C04B 35/52 (2006.01) C25C 3/16 (2006.01)

Patent

CA 2470757

The invention relates to a method for the graphitization of cathode blocks for the electrolytic production of aluminium according to the longitudinal graphitization method. Said method is characterised in that the cathode blocks are arranged in a longitudinal graphitization furnace in such a way that the distance between their end surfaces is between 25 and 150 mm and that current conduction between the individual cathode blocks takes place by means of conductive bodies. Two cathode blocks lie on each conductive body in such a way that the contact between said cathode blocks and the conductive bodies is established by the force of gravity acting on the cathode blocks. The invention also relates to the cathode blocks obtained by said method and to the use thereof for the electrolytic reduction of aluminium oxide.

L'invention concerne un procédé de graphitisation de blocs cathodiques, destinés à la production électrolytique d'aluminium, d'après la méthode de graphitisation en long. Ce procédé se caractérise en ce que les blocs cathodiques sont disposés dans un four de graphitisation en long de telle sorte que la distance entre leurs extrémités soit comprise entre 25 et 150 mm et en ce que le transfert de courant entre les différents blocs cathodiques se fasse par l'intermédiaire de corps conducteurs, les blocs cathodiques étant placés deux à deux sur les corps conducteurs de telle sorte que le contact entre ces blocs et lesdits corps soit établi par l'intermédiaire de la force de gravité s'exerçant sur les blocs cathodiques. L'invention concerne en outre les blocs cathodiques obtenus par ce procédé, ainsi que leur utilisation pour la réduction électrolytique d'oxyde d'aluminium.

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