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金属矿山 ›› 2009, Vol. 39 ›› Issue (06): 56-59.

• 矿物工程 • 上一篇    下一篇

云南召夸赤铁矿流化床直接还原—磁选试验

张朝英1,2,朱庆山1,侯宝林1,2   

  1. 1.中国科学院过程工程研究所;2.中国科学院研究生院
  • 出版日期:2009-06-08 发布日期:2011-07-21
  • 基金资助:

    国家重点基础研究发展规划(973)项目(编号:2007CB613502)。

Test Research on the Direct Reduction by Fluidized Bed- Magnetic Separation of Hematite Ore from Zhaokua, Yunnan

Zhang Chaoying1,2,Zhu Qingshan1,Hou Baolin1, 2   

  1. 1.Institute of Process Engineering,Chinese Academy of Sciences;2.Graduate University of Chinese Academy of Sciences
  • Online:2009-06-08 Published:2011-07-21

摘要: 召夸赤铁矿原矿品位低,嵌布粒度细。采用流化床作为直接还原装置,以H2与N2的体积比为1∶4的混合气体作为还原气,对召夸赤铁矿进行直接还原—磁选试验。结果表明:在700 ℃下将磨矿细度为-150目占92%的原矿直接还原70 min,可得金属化率为85.89%的还原矿。将还原矿在球磨机中细磨至平均粒径为3.98 μm,在场强为63.66 kA/m的磁选管中磁选,可得品位为73.04%,回收率为77.28%铁精矿。  

关键词: 赤铁矿, 流化床, 直接还原, 磁选

Abstract: The hematite ore from Zhaokua has a low grade and fine dissemination size. The test on the direct reduction-magnetic separation of this ore was made, with H2 and N2 mixture in a volume ratio of 1∶4 as the reducing gas. The run-of-mine ore ground to 92% -150 mesh was treated by direct reduction for 70min at 700 ℃ to get a metallization rate of 85.89%. The reduced ore was then finely ground to 3.98 μm on average and separated in a magnetic tube at 63.66 kA/m. As a result, an iron concentrate grading 73.04% at a recovery of 77.28% was obtained.

Key words: Hematite, Fluidized bed, Direct reduction, Magnetic separation