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What is the significance of leaching in the extraction of aluminium ?

Answer»

Solution :LEACHING helps in removal of impurities such as `TiO_2, SiO_2` and `Fe_2O_3` from the Bauxite ore.
`Al_2O_(3(s)) + 2NaOH_((aq)) + 3H_2O_((l))UNDERSET(2Na[Al(OH)_(4)])OVERSET(473K - 523K)(rarr)"sodium aluminate"`
`SiO_(2(l)) + 2NaOH_((aq))overset(473K - 523K)(rarr) underset("Sodium silicate")(Na_2SiO_(3(aq))) + H_2O_((l))`
`2Na[Al(OH)_(4)]_((aq)) + 2CO_(2(g)) to Al_2O_(3)cdot xH_2O_((s)) + 2NaHCO_(3(aq))`
`Al_2O_3cdotxH_2O_((s)) overset(1473K)(rarr)Al_2O_(3(s)) + xH_2O`.


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