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The Bayer process is a conventional method for refining bauxite in the production of alumina. The Al/Si ratio in bauxite before feeding to the process must be enriched to more than eight by reducing impurities (mainly aluminosilicates). Therefore, diasporic bauxite ores (Al/Si<6) have to be upgraded by pretreatment methods to meet the required quality for the Bayer process. Flotation separation...