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Am needing help on How to enrich alumina in low grade bauxite Al from 42% to 46%, from a low grade bauxite mines with Al 43%, Silica 7.5 %, Iron 28% reserves 15 million tonnes, with Al2O3 43%, can anybody suggest a beneficiation process to enrich Al2O3 to +46% and silica below 5%.for using in an aluminum plant?