Differentiate between extraction of aluminium by bayers process and by halls process (FROM 10 SSC )
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In the Bayer's process the ore is first ground in a ball mill. Then it is leached by heating with concentrated solution of caustic soda(NaOH) at 140 to 150 °C under high pressure for 2 to 8 hours in a digester. Aluminium oxide being amphoteric in nature, it reacts with the aqueous solution of sodium hydroxide to form water soluble sodium aluminate . This means that bauxite is leached by sodium hydroxide solution.
Al2O3.2H2O(s) + 2 NaOH (aq) --- 2 NaAlO2 (aq) + 3H2O(l)
Al2O3.2H2O(s) + 2 NaOH (aq) --- 2 NaAlO2 (aq) + 3H2O(l)
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