Anode in the electrolysis process of aluminium
a.carbon rods
b.gas carbon lining
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The electrolysis of pure alumina faces some difficulties. Pure alumina is a bad conductor of electricity. The fusion temperature of pure alumina is about 2000
∘
C and at this temperature when electrolysis is carried out on the fused mass, the metal formed vaporizes, as the boiling point of aluminium is 1800
∘
C. These difficulties are overcome by using a mixture containing alumina, cryolite (Na
3
,AlF
6
), and fluorspar (CaF
2
,). But the addition of cryolite do not minimize the anode effect and do not remove the impurities from alumina.
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