Aluminium Production
One of the major uses of caustic soda is the manufacture of aluminium oxide or alumina (Al2O3) from bauxite.
Bauxite is natural hydrated alumina containing impurities (iron and silica). The ore is added to a solution of caustic soda to form sodium aluminate.
This solution is filtered, washed, hydrolyzed and cooled to precipitate aluminium hydroxide. Trough heating, the latter substance is calcined in order to form alumina.
Alumina is reduced to metallic aluminum by electrolysis.
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