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Why is cryolite used in the electrolysis of Alumina?

alumina Chemistry electrolysis India Mathematics Used
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Why is cryolite used in the electrolysis of Alumina?

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Cryolite is used a flux to dissolve the oxide. Pure cryolite itself melts at 1012°C (1285 Kelvin), and it can dissolve the aluminium oxides sufficiently well to allow easy extraction of the aluminium by electrolysis. So energy consumption is lowered.

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