Class 12 Chemistry Metallurgy General Principles and Processes of Isolation of Elements



In order to obtain 1 tonne of aluminium, 4 tonnes of bauxite, 150 kg of sodium hydroxide and 600 kg of graphite is required. The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (III) oxide, Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
When bauxite is treated with sodium hydroxide solution, what happens to 
(i) the aluminium oxide
(ii) the iron (III) oxide
Solution:  (i) The aluminium oxide forms sodium aluminate.


 (ii) The iron (III) oxides does not dissolve in   and is removed by filtration.

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general principles and processes of isolation of elements
metallurgical operations
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general principles and processes of isolation of elements
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