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What is the role of graphite in the elec...

What is the role of graphite in the electrometallurgy of aluminium ?

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In electrometallurgy of aluminium oxygen gas is evolved at anode. It reacts with graphite to form `CO and CO_2`. In electrometallurgy of aluminium oxygen gas is evolved at anode. It reacts with graphite to form `(Al_2O_3)`.
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