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Bauxite calcination plant by rotary kiln with fine ,bauxite calcination plant by rotary kiln with fine grinding ball mill. refractory grade calcined bauxite. calcined bauxite is produced by sinteringcalcining of low iron, low alkali containing raw bauxites at temperatures of 1600 1800 degree celsius. In this calcination process the high refractory mineral phases corundum and mullite are