Process for brasquing fused electrolysis cells

Abstract

A process for brasquing cells for the fused electrolysis of alumina from the recovery of used brasques by treating the ground carbon-containing and refractory products of the base and walls by a known method with filtration of the insoluble constituents, distinguished by the fact that the base and lateral walls are covered by a heat-insulating bed formed by a mixture of carbon, NaF, CaF.sub.2, Al.sub.2 O.sub.3, Na.sub.2 SO.sub.4 and CaSO.sub.4, and by the fact that the cathode resting on the heat-insulating bed and containing the electrically conductive elements is formed from a brasque paste consisting of carbon, NaF, CaF.sub.2, AlF.sub.3, Na.sub.2 O and Al.sub.2 O.sub.3 associated with a binder which may be pitch. The qualities of the aluminum obtained from this cell are unchanged in relation to conventional processes.

Dependencies are inferred from the claim text.