In the extraction of aluminium,bauxite (Al_2O | vedclass

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Question

(B) In the Hall-$H$éroult process for the extraction of aluminium,pure $Al_2O_3$ has a very high melting point (approx. $2050 \ ^\circ C$). Adding mol

Vedclass · Accepted Answer

It reduces the melting point of aluminium oxide

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(B) In the Hall-$H$éroult process for the extraction of aluminium,pure $Al_2O_3$ has a very high melting point (approx. $2050 \ ^\circ C$). Adding molten cryolite $(Na_3AlF_6)$ serves two main purposes: $1$. It significantly lowers the melting point of the mixture to about $950 \ ^\circ C$,which saves energy. $2$. It increases the electrical conductivity of the molten mass,facilitating the electrolysis process.

In the extraction of aluminium,bauxite $(Al_2O_3 \cdot 2H_2O)$ is dissolved in molten cryolite $(Na_3AlF_6)$ because:

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