In the Hall-Heroult process,which substances | vedclass

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(B) In the $Hall-Heroult$ process,pure alumina $(Al_2O_3)$ has a very high melting point and is a poor conductor of electricity. To overcome these iss

Vedclass · Accepted Answer

Cryolite and fluorspar

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(B) In the $Hall-Heroult$ process,pure alumina $(Al_2O_3)$ has a very high melting point and is a poor conductor of electricity. To overcome these issues,cryolite $(Na_3AlF_6)$ and fluorspar $(CaF_2)$ are added to the alumina. These substances lower the melting point of the mixture to approximately $1240 \ K$ and increase its electrical conductivity,facilitating the electrolytic reduction of aluminum.

In the $Hall-Heroult$ process,which substances are added to alumina to lower its melting point?

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