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How is pure alumina obtained from bauxit...

How is pure alumina obtained from bauxite by leaching process.

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`Al_(2)O_(3)+2NaOH+3H_(2)Orarr2Na[Al(OH)_(4)]`
`2Na[Al(OH)_(4)]+2CO_(2)rarrAl_(2)O_(3)xH_(2)O+2NaHCO_(3)`
`Al_(2)O_(3)xH_(2)Ooverset(1470K)rarrAl_(2)O_(3)+xH_(2)O`.
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