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प्रश्न
How is the main ore of aluminium concentrated?
उत्तर
Conversion of Impure Bauxite to Sodium aluminate
`Al_2O_3.2H_2O + 2NaOH`
`2NaAlO_2 + 3H_2O`
Impurities such as `Fe_2O_3` and `S_iO_2` remain unaffected with conc.NaOH.
Conversion of Sodium aluminate to Aluminium hydroxide.
`NaAlO_2 + 2H_2O`
`NaOH + Al(OH)_3`
Conversion of `Al(OH)_3` to pure Alumina.
`2Al(OH)_3`
`Al_2O_3 + 3H_2O`
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