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Although thermodynamically feasible, in ...

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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Below the temperature (1623 K), corresponding to the point of intersection of Al,O, and MgO curves in magnesium can reduce alumina as discussed in above. But amgnesium is a much costlier metal than aluminium and hence the process will be uneconomical.
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