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金属矿山 ›› 2012, Vol. 41 ›› Issue (06): 50-53.

• 矿物工程 • 上一篇    下一篇

云南某难选铁矿石煤基直接还原—弱磁选试验

王静静1,杨慧芬2,曹志成1,肖晶晶3,仵晓丹4   

  1. 1.北京神雾环境能源科技集团股份有限公司;2.北京科技大学土木与环境工程学院;3.河北钢铁集团矿业有限公司承德柏泉铁矿;4.北京东方燕京矿山工程设计有限公司
  • 出版日期:2012-06-15 发布日期:2012-06-29

Experiment on Coal-based Direct Reduction-low Intensity Magnetic Separation of a Refractory Iron Ore in Yunnan Province

Wang Jingjing1,Yang Huifen2,Cao Zhicheng1,Xiao Jingjing3,Wu Xiaodan4   

  1. 1.Beijing Shenwu Environment and Energy Technology Co.,Ltd.;2.Civil and Environmental Engineering Institute,University of Science and Technology Beijing;3.Chengde Baiquan Iron Mine,Hebei Iron and Steel Group Mining Co.,Ltd.;4.Beijing Oriental Yanjing Mining Design Co.,Ltd.
  • Online:2012-06-15 Published:2012-06-29

摘要: 云南某铁矿石为混合型铁矿石,由于铁矿物嵌布粒度微细而难以采用常规选矿方法有效选别。为此,对该矿石进行了煤基直接还原—弱磁选试验,结果表明,将原矿与作为还原剂的云南某褐煤和作为助熔剂的CaO按100∶20∶10的质量比混合,在1 200 ℃的温度下直接还原焙烧50 min,焙烧矿在一段和二段磨矿细度分别为-325目占81.34%和-325目占92.41%、一段和二段弱磁选场强分别为187.10和143.31 kA/m的条件下进行两段磨矿—弱磁选,可获得铁品位为91.20%、铁回收率为87.05%的直接还原铁精矿,从而为该难选铁矿石的开发利用提供了技术支持。  

关键词: 混合型难选铁矿石, 直接还原焙烧, 弱磁选

Abstract: A iron ore of Yunnan is mixing iron ore, it is hard to separate by conventional recovery techniques for micro-fine iron ore. The method with coal-based direct reduction followed by low intensity magnetic separation is presented for this kind iron ore. The results show that the direct-reduction iron concentrate with grading 91.20% and recovery 87.05% is obtained under  the conditions of roasted ore by two-stage grinding and low intensity magnetic separation process with the weight ratios of iron ore/lignite/CaO as 100∶20∶10, the reduction roasting temperature of 1 200 ℃ for 50 min, the roasted ores-grinding fineness of 325 mesh 81.34% and 92.41% in the first and second grinding classification, two stage low intensity magnetic separation of 187.10 and 143.31 kA/m. The study offer the technical support for development and utilization of refractory iron ore.

Key words: Mixed refractory iron ore, Direct reduction roasting, Low intensity magnetic separation