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CHEMISTRY
Explain briefly the extraction of aluminium from bauxite.
October 15, 2019Nimisha Sasmal
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The extraction of the metal from bauxite involves the three main steps.
Concentration of Bauxite (Al2O3.2H2O)
Concentration of ore is done by leaching which helps in removing impurities like Fe2O3,SiO2, etc. Bauxite is treated with NaOH to form sodium aluminate which on further reaction with CO2 gives pure Alumina.
Al2O3+2NaOH+3H2O⟶2Na[Al(OH)4]2CO2−2NaHCO3Al2O3.xH2OΔ1470KPure aluminaAl2O3+xH2O
Electrolytic reduction of Alumina (Al2O3)
Electrolytic reduction of pure alumina takes place in iron box (cathode) with cryolite (Na3AlF
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