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In the electrolysis of alumina to obtain aluminium metal, cryolite is added mainly to
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lower the melting point of alumina
lower the melting point of alumina
Fused alumina $\left(\mathrm{Al}_2 \mathrm{O}_3\right)$ is a bad conductor of electricity. Therefore, cryolite $\left(\mathrm{Na}_3 \mathrm{AlF}_6\right)$ and fluorspar $\left(\mathrm{CaF}_2\right)$ are added to purified alumina which not only make alumina a good conductor of electricity but also reduce the melting point of the mixture to around $1140 \mathrm{~K}$.
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