Describe the three steps involved in the leaching of bauxite to get pu

1.	Describe the three steps involved in the leaching of bauxite to get pure Alumina.
Answer» 1. The bauxite ore contains silica (SiO₂) Iron oxide (Fe₂O₃) and titanium dioxide (TiO₂) as impurities. Bauxite in concentrated by digesting the powdered ore in a concentrated solution of NaOH at 473–523K and 35 bar pressure. Al₂O₃ dissolves in alkali and is leached as sodium aluminate leaving impurities behind. 2. The solution of Sodium aluminate is filtered cooled and neutralised by passing CO₂ gas and hydrated Al₂O₃ is precipitated by seeding. 3. Hydrated alumina is filtereds dried and heated to get pure alumina (Al₂O₃).

Describe the three steps involved in the leaching of bauxite to get pure Alumina.

Answer»

1. The bauxite ore contains silica (SiO₂) Iron oxide (Fe₂O₃) and titanium dioxide (TiO₂) as impurities. Bauxite in concentrated by digesting the powdered ore in a concentrated solution of NaOH at 473–523K and 35 bar pressure. Al₂O₃ dissolves in alkali and is leached as sodium aluminate leaving impurities behind.

2. The solution of Sodium aluminate is filtered cooled and neutralised by passing CO₂ gas and hydrated Al₂O₃ is precipitated by seeding.

3. Hydrated alumina is filtereds dried and heated to get pure alumina (Al₂O₃).

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