Question

what is " Electrolytic reduction of alumina " ? explain it with a neat diagram ​

Answer 1

it can then be tapped off as a pure liquid metal the aluminium sinks. because it is more dense than the aluminium prior light solution the oxygen from the aluminium oxide. in the cryolite forms at the positive Allard's the oxygen reacts with the carbon of the graphite forming carbon dioxide

Answer 2

The electrolysis of alumina is carried out in a steel tank lined inside with graphite. The graphite lining serves as 
     cathode. Anode is also made of graphite rods hanging in the molten mass.

    The electrolyte consists of alumina dissolved in fused Cryolite(Na3AlF6) and Fluorspar(CaF2).

    Cryolite lowers the melting point of alumina to 9500C and fluorspar increases the fluidity of the mass so that 
    the liberated aluminum metal may sink at the bottom of the cell.

    When electric current is passed through this mixture, the aluminum is collected at the cathode in molten state
    and sinks at the bottom and is tapped off.



                      
                       Ionization of Alumina:
                                                            2Al2O3 → 6O-2 + 4Al+3
                       Reaction at  Cathode:
                                                           4Al+3 + 12e-→ 4Al
                       Reaction at Anode:
                                                         6O-2 → 3O2 + 12e-
                                                           C + O2 → CO2