高硫铝土矿焙烧预处理的赤泥沉降性能  

On the Settling Performance of Red Mud from Preroasted High-Sulfur Bauxite

作　　者：吕国志[1] 张廷安[1] 鲍丽[1] 豆志河[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2009年第2期242-245,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50644016;50704011);国家重点基础研究发展计划项目(2007CB13504);教育部高等学校博士学科点专项科研基金资助项目(20050145029);辽宁省优秀青年科技人才基金资助项目(2005221012)

摘　　要：采用马弗炉、旋转管式炉分别对我国高硫铝土矿进行焙烧预处理,考察焙烧温度对焙烧矿溶出赤泥沉降性能的影响;利用SEM,XRD技术对焙烧矿溶出赤泥的表观形貌、物相组成变化进行分析,并对焙烧矿赤泥沉降性能变化机理做了进一步的探讨.实验结果表明:焙烧预处理使赤泥的表观形貌更加疏松多孔,使矿石中的针铁矿转化为憎水的赤铁矿,提高了赤泥的沉降性能;焙烧矿过于疏松会导致溶出赤泥严重细化,使赤泥沉降性能大为降低.与马弗炉焙烧相比,旋转管式炉焙烧矿溶出赤泥的沉降性能更好.The high-sulfur bauxite was preroasted in rotary tube furnace and muffle furnace to investigate the effect of roasting temperature on the settling performance of red mud digested from roasted high-sulfur bauxite. The changes in apparent morphology and phase composition were analyzed and discussed by SEM and XRD, as well as the changing mechanism of the settling performance of red mud. Experimental results indicated that preroasting process makes the apparent morphology of red mud looser and more porous and enables the geothite in bauxite ore to transform into hematite to improve the settling performance of red mud. The overloosened ore after roasting will cause the red mud to be excessively fine, thus making the settling performance of red mud poor to a great extent. Comparing the digested sludge from the preroasted ore in muffle furnace to the digested sludge from that in rotary tube furnace, the latter has better settling performance.

关 键 词：高硫铝土矿 焙烧 赤泥 沉降性能 

分 类 号：TF803.21[冶金工程—有色金属冶金]