 Bayer process - History: Encyclopedia - Bayer processThe Bayer process is the principal industrial means of producing alumina, itself important in the Hall-Héroult process for producing aluminum.
Bauxite, the most important ore of aluminum, contains only 40-60% alumina, Al2O3, the rest being a mixture of silica, various iron oxides, and titanium dioxide. The alumina must be purifed before it can be refined to aluminum metal. In the Bayer process, bauxite is washed with a hot solution of sodium hydroxide, NaOH, at 250°C. This converts the alumina to alumini ...
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