the graphite electrodes in the extraction of aluminium by hall heroult process need to be changed frequently why?
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The graphite electrodes in the extraction of 'aluminium' by Hall-Heroult process need to be changed frequently. ... During the electrolysis, aluminium is deposited at the cathode and oxygen is liberated at the anode and sometimes its react with the carbon in the graphite to form carbon-dioxide, so anode burnt away slowly.
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