摘要
采用还原烧结-磁选法处理高铁铝土矿,考察了氧化钙对烧结及烧结产品铝铁分离效果的影响,借助于X射线衍射仪、扫描电子显微镜,研究了不同氧化钙用量下还原烧结产品的物相组成及微观特性.结果表明,当氧化钙的质量分数为70%时,烧结物料的金属化率达到了93.95%,磁选精矿中铁的质量分数为83.10%,富铝渣的Al2O3浸出率为61.14%,Ca O分别与Al2O3和Si O2全部生成了12Ca O·7Al2O3和Ca2Si O2,铁元素得到较好的还原,同时非铁物质能够与铁颗粒分离.
Reduction sintering- magnetic separation process was adopted to deal with high ironbearing bauxite. The effects of calcium oxide on sintering and Al-Fe separation effect of sintering product were analyzed. Components and microstructure of the reduced sintering product added different dosage of calcium oxide were studied by X-ray diffraction and scanning electron microscope. The results showed that metallization rate of sintering product reached 93. 95%,the mass fraction of Fe in the magnetic concentrate was 83. 10% and Al2O3 leaching rate of rich aluminum slag increased to 61. 14% when the mass fraction of calcium oxide is 70%. Ca O could completely react with Al2O3 and Si O2 to produce 12 Ca O·7Al2O3and Ca2 Si O2,respectively,while Fe element was well reduced to iron which can be well separated from non-ferrous gangues by the magnetic separation.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第4期585-589,共5页
Journal of Northeastern University(Natural Science)
基金
国家自然科学基金青年基金资助项目(51104034)
中国博士后科学基金资助项目(2011M500826)
关键词
高铁铝土矿
氧化钙
还原焙烧
烧结
磁选
high iron-bearing bauxite
calcium oxide
reduction roasting
sinter
magnetic separation
