what are the use of electrolysis cathode and anode in extraction of aluminium
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In the electrolytic reduction of alumina, purified Al2O3 is mixed with Na3AlF6 or CaF2 which lowers the melting point of the mix and brings conductivity. The fused matrix is electrolysed. Steel cathode and graphite anode are used. The graphite anode is useful here for reduction to the metal. The overall reaction may be taken as :
The oxygen liberated at the anode reacts with the carbon of the anode to produce CO and CO2.
The oxygen liberated at the anode reacts with the carbon of the anode to produce CO and CO2.
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