Aluminum is extracted electrolytically from bauxite, which is aluminum ore. Bauxite contains hydrated alumina (Al2 O3) with some proportions of iron oxide. T
rbeena, check mah last answer,I hve edited it.
rbeena, check mah last answer,I hve edited it.
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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 (Na3AlF6) and fluorspar (CaF2) which lowers the melting point and increases the conductivity of electrolyte. Graphide rods act as anode.
At cathode:-
Al3+
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