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What is bauxite? What are the main impurities found in this ore?

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What is bauxite? What are the main impurities found in this ore?

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Bauxite (Al2O3.H2O) is hydrated aluminium oxide. It contains 30% to 70% Al2O3. The main impurities present in it are iron oxide (Fe2O3) and sand (SiO2).

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