东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2013, Vol. 34 ›› Issue (7): 1039-1044.DOI: -

• 资源与土木工程 • 上一篇    下一篇

深度还原-弱磁选回收稀土尾矿中铁的试验研究

林海1,2，许晓芳1,2，董颖博1,2，张文通1,2   

  1. (1.北京科技大学金属矿山高效开采与安全教育部重点实验室，北京100083；2.北京科技大学土木与环境工程学院，北京100083)
  • 收稿日期:2013-03-03 修回日期:2013-03-03 出版日期:2013-07-15 发布日期:2013-12-31
  • 通讯作者: 林海
  • 作者简介:林海(1966-)，男，四川南充人，北京科技大学教授，博士生导师.
  • 基金资助:
    国家高技术研究发展计划项目(2012AA062402).

Test Research on Recovery of Iron from Rare Earth Tailings by Depth Reduction Roasting-Low Intensity Magnetic Separation

LIN Hai1,2， XU Xiaofang1,2， DONG Yingbo1,2， ZHANG Wentong1,2   

  1. 1. Key Laboratory of HighEfficient Mining and Safety of Metal Mines， Ministry of Education， University of Science and Technology Beijing， Beijing 100083， China; 2. School of Civil and Environmental Engineering， University of Science and Technology Beijing， Beijing 100083， China.
  • Received:2013-03-03 Revised:2013-03-03 Online:2013-07-15 Published:2013-12-31
  • Contact: XU Xiaofang
  • About author:-
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摘要： 对某全铁品位为1625%的稀土尾矿进行了深度还原-弱磁选回收铁试验研究，研究了还原剂种类及用量、焙烧温度及时间、磨矿细度及磁场强度对铁精矿品位和回收率的影响，并采用SEM，XRD等手段对稀土尾矿、焙烧产物、铁精矿进行了测试.结果表明，在烟煤质量分数30%，焙烧温度1300℃，焙烧时间60min，磨矿细度-0074mm占75%，磁场强度118kA/m的条件下，所得铁精矿TFe品位可达8076%，铁回收率可达9324%；稀土尾矿经深度还原后，其中的赤、褐铁矿、硅酸铁等含铁矿物转化为单质铁，铁精矿品位和回收率较常规选矿方法大幅度提高，同时脉石矿物组成简单，有利于萤石的富集回收.

关键词: 稀土尾矿, 铁精矿, 深度还原, 弱磁选, 烟煤

Abstract: A process of depth reduction roasting-low intensity magnetic separation was introduced to the rare earth tailings with an iron grade of 1625%. The effects of processing parameters， such as the type and dosage of reducing agent， roasting temperature， roasting time， grinding fineness and magnetic field intensity on the iron grade and recovery of the concentrate were investigated. And the means of SEM， XRD were used to analyze the rare earth tailings， the roasted products and the iron concentrate. The results showed that an iron concentrate with TFe grade of 8076% and recovery of 9324% was obtained under the condition of bituminous coal dosage of 30%， roasting temperature of 1300℃， roasting time of 60min， grinding fineness of -0074mm accounted 75% and magnetic field intensity of 118kA/m. After depth reduction， ironbearing minerals in the tailings， such as hematite， limonite and iron silicate，translated into simple substance iron. Compared with the conventional separation methods， the iron concentrate grade and recovery increased more significantly and the gangue minerals composition was simple， which was helpful for enrichment and recovery of fluorite.

Key words: rare earth tailings, iron concentrate, depth reduction roasting, low intensity magnetic separation, bituminous coal

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