1.

Explain the Baeyer’s process of conversion of Bauxite into alumina.

Answer»

(i) Bauxite ore is finely ground and heated under pressure with a solution of concentrated caustic soda solution at 150°C to obtain sodium meta aluminate. 

(ii) On diluting sodium meta aluminate with water, a precipitate of aluminium hydroxide is formed.

(iii) The precipitate is filtered, washed, dried and ignited at 1000°C to get alumina.

2Al(OH)3 + 1000°C ⟶ Al2O3 + 3H2O



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