Question

Explain the Hall’s Process of electrolytic reduction of alumina with diagram.

Answer 1

Hall’s Process: 

Aluminium is produced by the electrolytic reduction of fused alumina (Al₂O₃) in the electrolytic cell. 

Cathode : Iron tank linked with graphite 

Anode : A bunch of graphite rods suspended in molten electrolyte.

Electrolyte : Pure alumina + molten cryolite + fluorspar (fluorspar lowers the fusion temperature of electrolyte)

Temperature: 900 – 950 °C 

Voltage used: 5 – 6 V 

Overall reaction: 2 Al₂O₃ → 4 Al + 3O₂ ↑