Process for producing aluminum

Details Process for producing aluminum Process for producing aluminum

C - Chemistry, Metallurgy

25

C

204/198, 204/49

C25C 3/12 (2006.01) C25C 3/06 (2006.01)

Patent

CA 1103612

ABSTRACT OF THE DISCLOSURE The present invention is for a process for producing aluminum by electrolyzing aluminum oxide dissolved in a molten salt bath in an electrolytic cell using ? Soderberg anode. The anode has vertical contact studs which are removable from the anode paste in the cell. The paste is composed of a composition that does not form a liquid or soup-like layer during electro- lysis. Instead, the process forms three layers, an upper layer, an inter layer and a lower layer. The lower layer is baked by heat from the molten salt bath and the joule heat generated from the contact portion between the contact studs and the anode paste. The interlayer is unbaked and is sufficiently viscous so as to retain its shape so that it will not flow into the holes formed should the studs be removed. The upper layer com- prises layer of small molded forms of the anode paste. There is a sufficient amount of such forms so that a load of at least 5 g/cm2 per unit area on the interlayer therebeneath is achieved. The surface temperature of the upper layer is no more than about I30°C.

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