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Everyone knows: $$\ce{Mg +Al2O3->MgO +Al}$$ This reaction is thermodynamically feasible. Use can we this for reduction of Alumina. And produce Aluminium. Then why don't we not use this why?

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If you compare the magnesium price (about 2$ per pound)

to the aluminum price (about $0.80 per pound)

you can see it is unprofitable.

Even considering the elements' relative atomic weight, you would still be losing money if you did that.

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    $\begingroup$ not everyone uses '$' or 'pound' $\endgroup$ – RE60K Jan 16 '15 at 13:59
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    $\begingroup$ @ADG regardless of the currency used, the fact remains that magnesium is more expensive than aluminium. $\endgroup$ – user15489 Apr 27 '15 at 21:27
  • $\begingroup$ @santiago Dave already mentioned "Even considering the elements' relative atomic weight, you would still be losing money if you did that." $\endgroup$ – RE60K Apr 28 '15 at 2:11
  • $\begingroup$ @ADG, my comment was in reference to your comment obviously $\endgroup$ – user15489 Apr 28 '15 at 2:20

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