Journal of Northeastern University ›› 2013, Vol. 34 ›› Issue (7): 1039-1044.DOI: -

• Resources & Civil Engineering • Previous Articles     Next Articles

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
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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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