Hall Heroult's Process: Extraction of Pure Aluminium

This 3D animation explains the electrolysis of pure alumina that is carried out in a steel tank lined with graphite which acts as the cathode and the hanging carbon electrode act as the anode.
A mixture of Fluorspar and Cryolite was added to Alumina for a better electrolysis process.

The Hall–Heroult process is used at an industrial scale to produce 99.5–99.8% pure aluminum. Aluminum prices lowered because it was hard to extract Aluminium from Alumina before the discovery of this method.