Explain the Bayers process with example.
Answers
Bayers process is used in the purification of red bauxite. Bauxite ore is leached with NaOH solution such that alumina goes in to the solution as sodiummetaaluminate and the Iron oxide impurities do not dissolve. NaAlO2 is hydrolysed to get the precipitate of Al(OH)3 which is dried, weighed and ignited to get pure Alumina.
Al2O3 + 2NaOH = 2NaAlO2 + H2O
NaAlO2+2H2O=Al(OH)3+NaOH
2Al (OH) 3 = Al2O3 + 3H2O.
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Answer: The Bayer process is the principal way for producing alumina by refining Bauxite. Bauxite other than with 30-60percentage of aluminium oxide contains mixture of silica, iron oxides and titanium dioxide. ... In the Bauxites, aluminium compounds are present as gibbsite (Al (OH) 3), boehmite (AlOOH) and diaspore (α-AlO (OH)).
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