How is sodium aluminate converted into sodium hydroxide in Bayer’s process?
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In the Bayer process, bauxite ore is heated in a pressure vessel along with a sodium hydroxide solution (caustic soda) at a temperature of 150 to 200 °C. At these temperatures, the aluminium is dissolved as sodium aluminate (primarily [Al(OH)4]−) in an extraction process. ... Al2O3 + 2 NaOH → 2 NaAlO2 + H2O.
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