东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (4): 585-589.DOI: 10.12068/j.issn.1005-3026.2015.04.028

• 资源与土木工程 • 上一篇    下一篇

氧化钙对高铁铝土矿烧结-分选效果的影响

袁致涛， 方萍， 张松， 李丽匣   

  1. (东北大学 资源与土木工程学院， 辽宁 沈阳110819)
  • 收稿日期:2014-04-23 修回日期:2014-04-23 出版日期:2015-04-15 发布日期:2014-11-07
  • 通讯作者: 袁致涛
  • 作者简介:袁致涛(1971-)，男，湖北大冶人，东北大学教授.
  • 基金资助:
    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).

Effects of Calcium Oxide on Sintering-Separation of High Iron-Bearing Bauxite

YUAN Zhi-tao， FANG Ping， ZHANG Song， LI Li-xia   

  1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China.
  • Received:2014-04-23 Revised:2014-04-23 Online:2015-04-15 Published:2014-11-07
  • Contact: dyyuanzhit@163.com)
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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%，CaO分别与Al2O3和SiO2全部生成了12CaO·7Al2O3和Ca2SiO2，铁元素得到较好的还原，同时非铁物质能够与铁颗粒分离.

关键词: 高铁铝土矿, 氧化钙, 还原焙烧, 烧结, 磁选

Abstract: Reduction sintering - magnetic separation process was adopted to deal with high iron-bearing 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%. CaO could completely react with Al2O3 and SiO2 to produce 12CaO·7Al2O3 and Ca2SiO2， respectively， while Fe element was well reduced to iron which can be well separated from non-ferrous gangues by the magnetic separation.

Key words: high iron-bearing bauxite, calcium oxide, reduction roasting, sinter, magnetic separation

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