38. Explain the process of leaching of alumina frofm bauxite.
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Bauxite usally contains silica ,iron ,oxides and titanium oxides and Impurities in the process of leaching of alumina is concentrated by digesting the powered ore with the concentrated solution of NaOh at 473-523k and 35-36 bar ...under these conditions ,alumina dissolves as sodium silicate leaving the impurities behind.....
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