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Although thermodynamically feasible, in practice , magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium .Why? |
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Answer» SOLUTION :Temperature abovethe point of intersection of `Al_(2) O_(3)` and MgOcurves, Mg canreduce `Al_(2) O_(3)`. But the temperaturerequired (1600K) is very high. Hence the reductionprocess will be uneconomicand difficult. `Fe_(2)O_(3) + 2A1 overset (1000-1500^(0)C) to A1_(2) O_(3) + 2FE` The ignition helps to overcomethe energy of activitation and hence the reaction is fast. |
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