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Properties & Uses of Aluminium

Though thermo...

Question

Though thermodynamically feasible, why is it uneconomical to use Magnesium metal for the reduction of alumina?

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Solution

Although the Mg can be used for the reduction of Al₂O₃ as per Ellingham diagram, but Mg is much costlier than Al hence it would not be economical to reduce Al₂O₃ using Mg. The cost of the production would be higher than the cost of the Al obtained during the process.

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Q. Although thermodynamically feasible, in practice, magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium. Why ?

Q. Study the Ellingham diagram for the formation of some oxides and answer the following question.
At the point of intersection of

A l_{2} O_{3}

M g O

△ G^{0}

becomes zero for the reaction,

\frac{2}{3} A l_{2} O_{3} + 2 M g \to + \frac{4}{3} A l

Below this point, magnesium can reduce alumina. Although thermodynamically feasible, Al is not used for reduction of

M g O

Q. Assertion :Magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium. Reason: MgO curve lies above

A l_{2} O_{3}

curve in Ellingharn diagram.

Q. Even though air contains

78 %

20 %

oxygen by volume and formation of

N O

is thermodynamically feasible, they do not combine to form

N O

. This is because

Q. Though aluminium is a reactive metal it is still used for packing food articles. Why?

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