Question

Name the compound added to pure alumina to lower the fusion temperature during the electrolytic of alumina.

Answer 1

• For the extraction of pure Aluminium two steps are followed: Baeyer’s Process and Hall-Heroult’s Process.
• In the Hall-Heroult’s process, the electrolytic reduction of alumina takes place.
• The melting point of the alumina is very high that is ${2000}^{°}C$, so in order to lower it CRYOLITE is added to it.
• Cryolite $\left(N{a}_{3}Al{F}_6\right)$decreases the melting point of alumina to $900-{950}^{°}C$.
• It also makes the alumina a good conductor of electricity.