Alcoa aluminium process

Process Industries Applications of Alcoa Aluminium, Alcoa, Pittsburgh, U.S.A. 

Figure 4.3 Cell for aluminium extraction by the Alcoa chloride process.

The only reasonably successful advance in this sense is the Alcoa process, based on the electrolysis of aluminium trichloride in a 2-15 per cent concentration at 700°C in a 3 2 mixture of molten sodium chloride and potassium chloride using carbon electrodes. Aluminium oxide is previously converted into aluminium chloride using chlorine from electrolysis. The reactions are thus... 

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