Give the chemical reactions involved in the leaching of alumina from bauxite.
Chemical reactions involved in the leaching of alumina from bauxite is as follows-
Al2O3 + 2NaOH +3H2O 2Na[Al(OH)4]
2Na[Al(OH)4] + CO2 Al2O3.xH2O + 2NaHCO3
Al2O3.xH2O Al2O3 + xH2O