Chemistry - Metallurgy Question with Solution | TestHub

For every 1 kg of aluminium produced, approximately 1.5 kg of carbon from the anode is consumed due to the formation of CO and ${\mathrm{CO}}_2$.

The addition of calcium fluoride ( ${\mathrm{CaF}}_2$ ) lowers the melting point of the electrolyte mixture and enhances its electrical conductivity compared to pure molten alumina.

The graphite anode is gradually consumed because oxide ions discharge at the anode to produce oxygen, which reacts with carbon to form CO and/or ${\mathrm{CO}}_2$.

Cryolite $\left({\mathrm{Na}}_3{\mathrm{AlF}}_6\right)$ acts as a solvent and facilitates the dissolution of alumina $\left({\mathrm{Al}}_2{\mathrm{O}}_3\right)$.