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Thursday, April 14, 2022

Hall Heroult process : Electrolytic refining of Alumina ore of Aluminium:

Electrolysis of fused Alumina.
Cathode : Iron-tank lined with carbon bricks
Anode : carbon
Electrolyte : Molten [Al2O3
(5%) Na3AlF6 (85%) + CaF2 (5%) + AlF3 (5%) ]
O2 is liberated at anode and Al collects at the bottom.


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