1.

What is the role of graphite rod in the electrometallurgy of aluminium?

Answer»

Graphite rod acts as anode in the electrometallurgy of aluminium. Graphite anode facilitates reduction of Al2O3 to aluminium by electrolysis. Carbon reacts with oxygen liberated at anode producing CO and CO2

At anode :

C (solid) + O2- (melt) → CO(g) + 2e-

C (solid) + 2O2- (melt) → CO2(g) + 4e-

At cathode :

Al3+(melt + 3e- → Al(I)


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