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金属矿山 ›› 2016, Vol. 45 ›› Issue (12): 13-17.

• 矿物工程 • 上一篇    下一篇

东鞍山含碳酸盐正浮选尾矿悬浮焙烧—弱磁选试验

李文博1,唐志东1,杨光2,韩跃新1,李艳军1   

  1. 1.东北大学资源与土木工程学院,辽宁 沈阳 110819;2.鞍钢集团矿业公司,辽宁 鞍山 114001
  • 出版日期:2016-12-15 发布日期:2017-02-16
  • 基金资助:

    基金项目:国家自然科学基金项目(编号:51604064),中央高校基本科研业务费项目(编号:N150103003),辽宁省博士科研启动基金项目(编号:201601027)。

Research on Suspension Roasting-Low Intensity Magnetic Separation of Donganshan Direct-flotation Tailings Containing Carbonate

Li Wenbo1,Tang Zhidong1,Yang Guang2,Han Yuexin1,Li Yanjun1   

  1. 1.College of Resource and Civil Engineering,Northeastern University,Shenyang 110819,China;2.Mining Corporation,Anshan Iron & Steel Group,Anshan 114001,China
  • Online:2016-12-15 Published:2017-02-16

摘要: 东鞍山含碳酸盐正浮选尾矿铁品位为43.53%,主要含铁矿物为赤铁矿、磁铁矿和菱铁矿。为给该正浮选尾矿高效回收利用提供依据,采用悬浮焙烧—磁选工艺进行了选矿试验。结果表明:在气体流量为12 m3/h、H2浓度为40%、焙烧温度为600 ℃、焙烧时间为8 s条件下进行悬浮焙烧试验,焙烧产品磨细至-0.043 mm占95%,在磁场强度为85.1 kA/m条件下弱磁选,可获得铁品位为60.52%、回收率为78.68%的精矿。对悬浮焙烧前后物料的磁性检测、XRD分析可知,试样中弱磁性的含铁矿物经悬浮焙烧后转变为强磁性的磁铁矿,磁性增强,扩大了铁矿物与脉石矿物的磁性差异,可通过弱磁选进行有效分离。

关键词: 正浮选尾矿, 悬浮焙烧, 菱铁矿, 磁性

Abstract: Iron grade of Donganshan direct-flotation tailings containing 43.53% Fe,iron mainly exists in form of hematite,magnetite and siderite.Suspension roasting-magnetic separation was carried out in order to provide technique basis for utilization of the direct-flotation tailings.The results indicated that,with gas flow rate of 12 m3/h,H2 concentration 40%,suspension roasting temperature at 600 ℃ for 8 s,roasted products ground to -0.043 mm 95%,via low intensity magnetic separation at intensity of 85.1 kA/m,iron concentrate with iron grade of 60.52% and recovery of 78.78% was obtained.Magnetism and XRD analysis on materials both before and after the suspension roasting indicated that,iron-bearing low intensity magnetism material was changed to high intensity magnetism magnetite,enhance the magnetism,expanded the magnetism difference of iron ore and gangue minerals,effective separation can be obtained by low intensity magnetic separation.

Key words: Direct-flotation tailings, Suspension roasting, Siderite, Magnetism