Method of producing aluminium in an electrolysis cell

C - Chemistry – Metallurgy – 25 – C

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C25C 3/20 (2006.01)

Patent

CA 2728021

The invention relates to a method of producing aluminium in an electroly-sis cell, which includes setting up a succession of control periods of duration T, identifying per-turbative tending operations on the cell that can introduce superfluous alumina in the electrolytic bath, noting the performance of the perturbative tending operations, determining a regulation feed rate B(k') for each control period k' and set-ting a specified feed rate SR(k') equal to M(k') x B(k'), where M(k') is a predetermined modula-tion factor that modulates the regulation feed rate B(k') so as to take into account a reduction of the needs of the cell induced by the superflu-ous alumina. The method of the invention makes it possible to significantly reduce the rate of oc-currence of anode effects.

L'invention porte sur un procédé de production d'aluminium dans une cellule d'électrolyse, lequel procédé comprend la définition d'une succession de périodes de commande d'une durée T, l'identification de fonctionnements à tendance perturbatrice sur la cellule qui peuvent introduire de l'alumine superflue dans le bain électrolytique, le rapport de la performance des opérations à tendance perturbatrice, la détermination d'un débit d'alimentation de régulation B(k') pour chaque période de commande k' et de définition d'un débit d'alimentation spécifié SR(k') égal à M(k') x B(k'), M(k') étant un facteur de modulation prédéterminé qui module le débit d'alimentation de régulation B(k') de façon à prendre en compte une réduction des besoins de la cellule induite par l'alumine superflue. Le procédé selon l'invention permet de réduire de façon significative le taux d'apparition d'effets d'anode.

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