高硫铝土矿粗粒径焙烧脱硫及其溶出性能  

Roasting Desulphurization and Digestion Performance of High Sulfur-bearing Bauxite with Coarse Particle Size

作　　者：赵聪[1] 陈朝轶[1] 李军旗[1] 张曼[1] 

机构地区：[1]贵州大学材料与冶金学院,贵阳550025

出　　处：《有色金属（冶炼部分）》2015年第7期34-37,共4页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(51264006;51474079);贵州省科技厅国际合作项目(G[2013]7007);贵州省教育厅项目(黔教合重大专项字[2012]0002);贵州省校合作项目(LH[2014]7609);贵阳市科技局项目([2012103]69;20122056-4)

摘　　要：分别对盘磨（粒径830μm占75%）和球磨（粒径75μm占85%）的一水硬铝石型高硫铝土矿进行焙烧脱硫处理,并与原矿进行溶出对比试验研究。结果表明,在700℃焙烧30min后,盘磨矿与球磨矿的硫含量分别从2.33%降至0.68%与0.64%,可以满足氧化铝生产工艺要求。当溶出条件为苛碱浓度245g/L、溶出温度260℃、石灰添加量8%、溶出时间60min时,焙烧矿氧化铝的溶出率提高了3.0-4.5个百分点。Roasting desulfurization and digestion performance of high sulfur-bearing bauxite of millstonemilling（particle size of 75%-830μm）and ball-milling（particle size of 85%-75μm）were investigated comparatively with raw ore.The results show that sulfur content of millstone-milling and ball-milling drops from 2.33%to 0.68% and 0.64%respectively after roasted at 700 ℃for 30 min,which meets the requirement of alumina production.Al2O3 digestion rate of roasted sample can be improved by 3-4.5percentage under the optimum digestion conditions including caustic alkali concentration of 245 g/L,digestion temperature of 260 ℃,lime dosage of 8%,and digestion time of 60 min.

关 键 词：高硫铝土矿 粒度 焙烧 溶出性能 

分 类 号：TF821[冶金工程—有色金属冶金]