Question

Alumina is extracted from Bauxite Al2O3.2H2O by Bayer's Process(in a chemical method).......Why can't Bauxite be only ignited to produce Pure alumina by removing water of crystallization???

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Answer 1

Answer:

Bauxite usually contains silica, iron oxide, and titanium oxide as impurities. In the process of leaching, alumina is concentrated by digesting the powdered ore with a concentrated solution of NaOH at 473-523K and 35-36 bar. Under these conditions, alumina dissolves as sodium silicate leaving the impurities behind.