Aluminium is extracted from alumina Al_2O_3 b | vedclass

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(A) The electrolysis of pure alumina faces some difficulties. Pure alumina is a bad conductor of electricity.The fusion temperature of pure alumina is

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$Al_2O_3 + Na_3AlF_6 + CaF_2$

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(A) The electrolysis of pure alumina faces some difficulties. Pure alumina is a bad conductor of electricity.The fusion temperature of pure alumina is about $2000^{\circ} C$ and at this temperature,the metal formed vaporizes,as the boiling point of aluminum is $1800^{\circ} C$.These difficulties are overcome by using a mixture containing alumina $(Al_2O_3)$,cryolite $(Na_3AlF_6)$,and fluorspar $(CaF_2)$,which lowers the melting point to about $900^{\circ} C$ and increases electrical conductivity.

Aluminium is extracted from alumina $Al_2O_3$ by electrolysis of a molten mixture of

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