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In electrometallurgy of aluminium, why is the graphite rod used? |
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Answer» Solution :(1) In the electrometallurgy, aluminium is obtained by the electrolysis of fused electrolyte of alumina `(Al_(2)O_(3))` in cryolite and `CaF_(2).` (2) At high temperature, the carbon rods are used as anode which give high efficiency of electrolytic process. (3) During electrolysis `O_(2)` is LIBERATED by the REACTION of `F_(2)` formed at anode with alumina, `Al_(2)O_(3)`. This OXYGEN reacts with carbon forming CO and further `CO_(2)`. |
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