Question

Write the constituents of electrolyte for the extraction of aluminium.

Answer 1

1. Pure alumina melts at about $2000°\mathrm{C}$and is a bad conductor of electricity.
2. If fused cryolite and fluorspar is added, the mixture melts at $900°\mathrm{C}$ and ${\mathrm{Al}}_2{\mathrm{O}}_3$​ becomes a good conductor of electricity.
3. Electrolyte: $60$ parts cryolite + $20$parts fluorspar + $20$ parts pure alumina .
4. Thus, the constituents of electrolyte for the extraction of Aluminium are cryolite (${\mathrm{Na}}_3{\mathrm{AlF}}_6$) , fluorspar (${\mathrm{CaF}}_2$) and alumina (${\mathrm{Al}}_2{\mathrm{O}}_3$)