2009•The Chinese Journal of Nonferrous MetalsRequires access
Roasting pretreatment of high-sulfur bauxite and digestion performance of roasted ore
Guozhi Lv, Ting‐an Zhang, Bao Li, Zhihe Dou, Aichun Zhao, QU Hai-cui, Peiyuan Ni
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Abstract
The high-sulfur bauxite was pretreated in muffle furnace, rotary tube furnace and fluidized bed.The effects of roasting temperature and roasting time on the desulfurization performance and digestion rate were studied.The changes in micromorphology and phase composition were analyzed and discussed by SEM and XRD, and the changing mechanism of desulfurization by roasting was tested.Digestion rate of roasted ore was also tested.The experimental results indicate that the sulfur element is successfully discharged as gas form and the sulfur content of roasted ore meets the industrial standard.The reasonable conditions of roasting pretreatment by using muffle furnace and rotary tube furnace are 750 ℃ for 30 min, and 800 ℃ for 10 min by using fluidized bed.The roasted ore by using fluidized bed has the best digestion performance.The alumina digestion rate of roasted ore by using fluidized bed reaches 93.7% at digestion temperature of 220 ℃, digestion molecule ratio of 1.3 and caustic concentration of 220 g/L.