中文摘要：

采用马弗炉、旋转管式炉和流化床对我国高硫铝土矿进行焙烧预处理。考察焙烧温度、焙烧时间对硫含量以及焙烧矿溶出性能的影响;利用SEM和XRD技术对焙烧矿的微观形貌及晶型结构进行表征;探讨高硫矿焙烧脱硫机理。结果表明：焙烧脱硫处理我国高硫铝土矿是可行的,焙烧预处理矿可满足我国氧化铝生产的工业要求;马弗炉、旋转管式炉焙烧预处理的合适工艺条件为：焙烧温度750℃,焙烧时间30min;流化床焙烧预处理的合适工艺条件为：焙烧温度800℃,焙烧时间10min;流态化焙烧矿溶出效果最好,该焙烧矿在溶出温度220℃、溶出配料分子比1.3、苛性碱浓度220g/L的溶出条件下,矿石中氧化铝的相对溶出率可达到93.7%。

英文摘要：

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.