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Describe the three steps involved in the...

Describe the three steps involved in the leaching of bauxite to get pure alumina (equations not expected). 

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(i) Bauxite is concentrated by digesting the powdered ore in a concentrated solution of sodium hydroxide at 473-573 K and 35 bar pressure. `Al_(2)O_(3)` is leached as sodium aluminate.
(ii) Aluminate solution is neutralised by passing `CO_(2)`. Hydrated `Al_(2)O_(3)` is precipitated by seeding.
(iii) Hydrated `Al_(2)O_(3)` is filtered, dried and heated to get pure `Al_(2)O_(3)`.
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