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The Bayer process involves digesting bauxite ore with a hot sodium hydroxide solution, which dissolves the aluminum oxide and forms sodium aluminate. Impurities are removed by filtering, while aluminum hydroxide precipitates from the solution and is calcined to produce aluminum oxide. The sodium hydroxide solution is recycled, but builds up impurities over time that must be extracted. For bauxites with over 10% silica, an alternative process must be used due to insoluble sodium aluminum silicate formation r

Author

Wade Coleman

Language

EN