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What is the role of cryolite in the meta...

What is the role of cryolite in the metallurgy of aluminium?

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Aluminium metal is obtained by the electrolytic reduction of alumina (Hall-Heroult process). The melting point of pure alumina is very high (2323 K). Cryolite (`Na_(3)AlF_(6)`) and / or fluorspar `(CaF_(2))` is added to alumina because The melting point of alumina reduced.
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