高硫铝土矿微波焙烧预处理  

Microwave roasting pretreatment of high-sulfur bauxite

作　　者：张念炳[1,2] 白晨光[1] 邓青宇[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]贵州师范大学材料与建筑工程学院,贵阳550014

出　　处：《重庆大学学报（自然科学版）》2012年第1期81-85,共5页Journal of Chongqing University

基　　金：贵州省科学技术基金项目(黔科合J字[2011]2038);贵州师范大学博士基金资助项目;贵阳市科技计划项目(筑科合同[2011101]J1-39)

摘　　要：为了解决高硫铝土矿马弗炉焙烧脱硫效率不高问题,采用微波加热方式对高硫铝土矿进行焙烧,考察了焙烧温度和焙烧时间对矿物中硫含量的影响。用XRD技术对焙烧矿物晶型结构进行了分析,结果表明,微波焙烧温度400℃、焙烧时间2min时,焙烧矿中硫元素含量已低于0.7%;微波焙烧温度550℃、焙烧时间10min时,焙烧矿中硫元素含量为0.23%。微波使黄铁矿分离出S2-,并促使S2-向表面扩散与氧反应生成SO2气体,加速硫的逸出,提高了脱硫效率。To increase desulfurization efficiency of oxidizing roasting in muffle furnace, microwave is used to roast the high-sulfur bauxite. The influences of roasting temperature and time on sulfur content are investigated, and the final phases are recognized by XRD analysis. The results show sulfur content is less than 0.7% after being roasted at 400 ℃ for 2 min. If it＇s roasted at higher temperature for longer time, like 550℃ for 10 rain, the sulfur content decreases to 0.23%. Sulfide ion can be dissociated by microwave and diffuses to the surface to form sulfur dioxide. This process will accelerate dissociation further so as to increase desulfurization efficiency.

关 键 词：微波 焙烧 脱硫 高硫铝土矿 

分 类 号：TF821[冶金工程—有色金属冶金]