Cathode element for an electrolysis cell for the production...

C - Chemistry – Metallurgy – 25 – C

Patent

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Details

C25C 3/16 (2006.01)

Patent

CA 2559372

The invention relates to a cathode element for an electrolysis cell bath for the production of aluminium, comprising a cathode block (5), made from a carbon material with at least one longitudinal groove on one of the lateral faces thereof and a steel connector bar (6), fixed in said groove such that a part of the bar extends from one end of the block, sealed in the groove by means of the introduction of a conducting sealant material between the bar and the block and which contains at least one metal insert, the electrical conductivity of which is greater than said steel. According to the invention, the insert (16) is arranged longitudinally within the bar and is located, at least partly, in the section (19) of the connector bar located outside the bath and the connector bar (6) is not sealed to the cathode block in a non-sealing region (17) of given surface (S) located at the end of the groove at the head of the block. The presence of such an insert simultaneously provides a large reduction in the global cathode voltage drop and the current density at the head of the block.

L'invention a pour objet un élément cathodique, pour l'équipement d'une cuve de cellule d'électrolyse destinée à la production d'aluminium, comportant un bloc cathodique (5) en matériau carboné ayant au moins une rainure longitudinale sur une de ces faces latérales et une barre de raccordement (6) en acier, qui est logée dans ladite rainure de façon à ce qu'une partie de la barre émerge d'une extrémité du bloc, qui est scellée dans la rainure par interposition d'un matériau de scellement conducteur entre la barre et le bloc et qui contient au moins un insert métallique dont la conductivité électrique est supérieure à celle dudit acier. Selon l'invention, l'insert (16) est disposé longitudinalement à l'intérieur de la barre et se situe, au moins en partie, dans le tronçon (19) de la barre de raccordement qui est destiné à se situer à l'extérieur de la cuve et la barre de raccordement (6) n'est pas scellée au bloc cathodique dans une zone de non-scellement (17) de surface déterminée S située à l'extrémité de la rainure en tête de bloc. La présence d'un insert selon l'invention permet d'obtenir simultanément une très forte réduction de la chute de tension cathodique globale et de la densité de courant en tête de bloc.

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