6.29 What is the role of graphite rod in the electrometallurgy of aluminium?
6.29 What is the role of graphite rod in the electrometallurgy of aluminium?
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1 Answer
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Graphite rod acts as anode and graphite lined iron acts as a cathode in the electrometallurgy of aluminium. Carbon reacts with oxygen liberated at anode producing CO and CO2 otherwise oxygen liberated at the anode may oxidize some of the liberated aluminium back to Al2O3.
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Na+ C + N + S ®NaSCN
Fe3+ + SCN–
In the metallurgy of aluminium, purified Al2O3 is mixed with Na3AIF6 or CaF2 which lowers the melting point of the mixture and brings conductivity.
Ellingham diagram explains the feasibility of reduction process not the kinetics of process.
Malachite : CuCO3.Cu (OH)2
Azurite : 2CuCO3.Cu (OH)2
Cuprite : Cu2O
Copper pyrite : Cu2S.Fe2S3.
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