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金属矿山 ›› 2012, Vol. 41 ›› Issue (03): 70-73+77.

• 矿物工程 • 上一篇    下一篇

某难选铁矿石压球—直接还原—磁选试验

魏玉霞1,2,孙体昌1,2,肖宝清1,2,寇珏1,2,余文1,2,蒋曼1,2   

  1. 1.北京科技大学土木与环境工程学院;2.金属矿山高效开采与安全教育部重点实验室
  • 出版日期:2012-03-27 发布日期:2012-04-18

Test of Pelletizing-direct Reduction-magnetic Separation to A Refractory Iron Ore

Wei Yuxia1,2,Sun Tichang1,2,Xiao Baoqing1,2,Kou Jue1,2,Yu Wen1,2,Jiang Man1,2   

  1. 1.School of Civil and Environment Engineering,University of Science and Technology Beijing;2. Key Laboratory of High Efficient Mining and Safety of Metal Mines, Ministry of Education
  • Online:2012-03-27 Published:2012-04-18

摘要: 以某低品位复杂难选铁矿石为对象,研究了压球—直接还原—磨选工艺影响因素和机理。结果表明,将破碎至-4 mm的矿石与0.5%的黏结剂、10%的水和20%的内配煤M3混匀,在压力为190 kN时压制成φ30 mm×20 mm的压球,在1 200 ℃下还原40 min,焙烧球碎磨至-43 μm占85%,经磁场强度均为88 kA/m的1粗1精弱磁选流程处理,最终获得了铁品位为91.44%、回收率为90.85%的直接还原铁产品,可直接作为炼钢的优质原料。

关键词: 难选铁矿石, 压球, 直接还原, 磁选

Abstract: Basedon a low grade complex refractory iron ore, researched the effect indexes and mechanism of pelletizing-direct reduction-grinding and separation technology.Raw ore crashed to less than 4 mm was mixed with 0.5% of organic binder, 10% of water and 20% of reductant coal named M3 for pelletizing under the pressure of 190 kN and then got the pellets of  φ30 mm×20 mm. The pellets were reduced at 1 200 ℃ for 40 min and then the roasting pellet was ground to the size -43 μm 85%, magnetic separation at 88 kA/m under two stage separation. The direct reduction iron with 91.44% iron grade and 90.85% recovery was obtained under this condition. The DRI can be used as superior burden for making steel.

Key words: Refractory iron ore, Pelletizing, Direct reduction, Magnetic separation