Which among the following statement(s) is(are) true for the extraction of aluminium from bauxite?
Select ALL correct options:
A
$$ \text { Hydrated } \mathrm{Al}_2 \mathrm{O}_3 \text { precipitates, when } \mathrm{CO}_2 \text { is bubbled through a solution of sodium aluminate. } $$
B
Addition of $\mathrm{Na}_3 \mathrm{AlF}_6$ lowers the melting point of alumina.
C
$\mathrm{CO}_2$ is evolved at the anode during electrolysis.
D
The cathode is a steel vessel with a lining of carbon.
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