东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (6): 865-868.DOI: 10.12068/j.issn.1005-3026.2016.06.022

• 资源与土木工程 • 上一篇    下一篇

粒度分布对赤铁矿浮选的影响

李东1， 印万忠1,2， 马英强2， 姚金1   

  1. (1. 东北大学 资源与土木工程学院， 辽宁 沈阳110819； 2. 福州大学 紫金矿业学院， 福建 福州350108)
  • 收稿日期:2015-04-09 修回日期:2015-04-09 出版日期:2016-06-15 发布日期:2016-06-08
  • 通讯作者: 李东
  • 作者简介:李东(1990-)，男，河北沧州人，东北大学博士研究生； 印万忠(1970-)，男，浙江临安人，东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51374079).

Effects of Particle Size Distribution on Hematite Flotation

LI Dong1， YIN Wan-zhong1,2， MA Ying-qiang2， YAO Jin1   

  1. 1.School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China; 2.College of Zijin Mining， Fuzhou University， Fuzhou 350108， China.
  • Received:2015-04-09 Revised:2015-04-09 Online:2016-06-15 Published:2016-06-08
  • Contact: LI Dong
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摘要： 以赤铁矿为研究对象，通过浮选试验、扩展的DLVO(EDLVO)理论和凝聚动力学研究了粒度分布(粒径小于18μm的微细粒比例)对赤铁矿浮选的影响.浮选结果表明赤铁矿的浮选回收率与粒度的大小和分布有关，粗粒(粒径大于18μm)赤铁矿的粒度较大时或粒度分布均衡时(微细粒与粗粒含量接近)浮选回收率较高.EDLVO理论计算表明微细粒赤铁矿与粗粒赤铁矿之间存在吸引力，且吸引力的大小与粗粒粒度正相关；凝聚动力学分析表明粒度分布均衡时颗粒间的凝聚速率较大.这是粒度分布对赤铁矿的浮选回收率产生影响的主要原因.

关键词: 微细粒, 赤铁矿, 浮选, 油酸钠, 粒度分布

Abstract: Effects of the content of fine fractions (< 18μm) on hematite flotation were studied by using flotation tests， extended DLVO (EDLVO) theoretical calculations and kinetics of particle aggregation. The flotation results indicate that hematite recovery is related with the size of coarse particle (> 18μm) and particle size distribution. When the size of coarse particle is relatively large， the recovery of hematite is high. EDLVO theoretical calculations confirm that the fine particles could interface with the coarse particles and the attraction energy increases with the coarse particle size increasing. The flotation recovery increases with the particle size distribution becoming balance (the fine fractions equals the coarse fractions)， and the rate of particle coagulation is relatively high in this case which is analyzed by kinetics of particle aggregation. These conclusions could explain why the recovery of hematite is influenced by particle size distribution.

Key words: fine particles, hematite, flotation, sodium oleate, particle size distribution

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