Question

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

Answer 1

Answer:

Hii

Graphite rod is used as an anode and graphite line iron as cathode during the electrolysis of alumina. ... Thus the role of graphite in electrometallurgy of aluminium is to prevent the liberation of oxygen so that the aluminium is not oxidized by oxygen.

Answer 2

In the electrometallurgy of aluminium, oxygen gas is evolved at anode. O2 reacts with graphite or carbon (graphite electrodes) to form carbon monoxide and carbon dioxide. In case if some other metal electrodes is used as anode, then oxygen will react with aluminium formed during the process to form aluminium oxide(Al2O3) which will pass into the reaction mixture resulting into wastage of Al. Since graphite is cheaper than aluminium, its wastage or can be tolerated.