Effect and mechanism of surface pretreatment on desulfurization and desilication from low-grade high-sulfur bauxite using flotation
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Wuhan University of Technology
Pingdingshan Huaxing Flotation Engineering Technology Co., Ltd
Hubei Province Key Laboratory of Processing of Mineral Resources and Environment,
School of Resources and Environmental Engineering, Jiangxi University of Science and Technology
Publication date: 2019-05-28
Corresponding author
Guangjun Mei   

Wuhan University of Technology
Physicochem. Probl. Miner. Process. 2019;55(4):940–950
Surface pretreatment using a hot alkaline solution was carried out to improve the effect of desulfurization and desilication on low-grade bauxite with high sulfur content. The results demonstrated that, after surface pretreatment, a maximum grade and recovery of 66.17% and 87.27%, respectively, were achieved, and the sulfur content and ratio of A/S were 0.19% and 7.09, respectively. The surface pretreatment mechanism was further analysed by XRD and SEM analyses. The improved results of desulfurization and desilication were attributed to the selective corrosion of aluminosilicate minerals in coarse particles, reducing the active silicon sites on the surface of coarse particles as well as enhancing the cation exchange between the collector and aluminosilicate minerals.