Question

The following questions relate to the extraction of Aluminium by electrolysis:
(a) Name the other Aluminium containing compound added to Alumina and state its significance.

Answer 1

• The electrolytic mixture, Cryolite (${\text{Na}}_{\text{3}}{\text{AlF}}_{\text{6}}$), and Fluorspar are also added to lower the fusing temperature, improve the mixture's conductivity, and improve mobility.
• Bauxite is the most common resource used to extract Aluminium.

Significances are as follows;

• Cryolite boosts electrolyte conductivity while lowering the electrolytic cell's working temperature.
• Alumina is dissolved in Molten cryolite (${\text{Na}}_{\text{3}}{\text{AlF}}_{\text{6}}$), which decreases the fusion temperature from and$2050{}^{\circ }\text{C}$ to $950{}^{\circ }\text{C}$ improves conductivity.
• The melting point of a combination of Cryolite and Aluminium oxide is lower than that of pure Aluminium oxide.