In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to :

dissolve bauxite and render it conductor of electricity.

lower the melting point of bauxite.

minimise the heat loss due to radiation.

protect aluminium produced from oxygen.

The refining of a metal by electrolysis is known as electrolytic refining.
In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to dissolve bauxite and render it a conductor of electricity.
In this process, the bottom of the electrolytic cell is coated with carbon and made up of iron.
It have tree fused layers :-
Lower layer :- contain alloy of copper and impure aluminium
Middle layer :- Contains cryolite and barium fluoride.
Upper layer :- Contains pure aluminum that acts as cathode.

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