C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
C25C 3/06 (2006.01)
Patent
CA 2496683
The invention relates to a method for pre-heating a stack (1) provided with anodes (10) and cathodes (5) for electrolysis aluminium production. Said method comprises a first stage which is carried out prior to power supply to the stack when a layer of granulated conductive material is placed and crushed between anodes and cathodes. Said invention is characterised in that the granulated conductive material is graphite-based and the crushed layer thereof extends in the form of fixed contacts (13) only on the part of the top surface (14) of each anode.
La présente invention se rapporte à un procédé de préchauffage d~une cuve (1) pourvue d~anodes (10) et de cathodes (5) pour la production d~aluminium par électrolyse, ledit procédé comprenant une première étape, avant alimentation en courant de la cuve, durant laquelle une couche d~un matériau granulé conducteur est déposée puis écrasée entre les anodes et les cathodes, caractérisé en ce que le matériau granulé conducteur est à base de graphite et en ce que la couche du matériau granulé conducteur ne s~étend, après écrasement, que sur une partie de la surface inférieure (14) de chaque anode et prend la forme de plots (13).
Basquin Jean-Luc
Jouaffre Denis
Vanvoren Claude
Aluminium Pechiney
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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