Abstract
A large amount of tailing from the flotation processing of pyrite ore are accumulated and landfilled, resulting in serious environmental pollution and a waste of valuable elements such as Al, Ti, Si, etc. Aiming to extract alumina from coal-derived pyrite flotation tailing, the process has been proposed based on activation roasting-alkali leaching for desilication, followed by alumina extraction via Bayer process. Proper parameters of the desilication system and Bayer process were investigated in this work. Under the optimized conditions of desilication in the pilot scale experiment, an alumina concentrate with 69.49% Al2O3 and alumina to silica mass ratio (A/S) of 5.93 was obtained from a pyrite flotation tailing bearing 46.22% Al2O3 and 28.33% SiO2, and the corresponding desilication ratio was 73.06%. Then, under the appropriate conditions of Bayer process, the digestion of alumina was 78.42%. The results provide a new way for utilization of pyrite tailings.
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