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炼焦中煤的尺度效应及对浮选的影响
  • Title

    Scale effect of coking coal middlings and its influence on flotation

  • 作者

    邹文杰曹亦俊孙春宝

  • Author

    ZOU Wen-jie1 ,CAO Yi-jun2 ,SUN Chun-bao1

  • 单位

    北京科技大学土木与环境工程学院中国矿业大学国家煤加工与洁净化工程技术研究中心

  • Organization
    1. Civil and Environmental Engineering School,University of Science and Technology Beijing,Beijing  100083,China;2. National Engineering Research Cen-ter of Coal Preparation and Purification,China University of Mining and Technology,Xuzhou  221116,China
  • 摘要
    为了考察煤泥粒度变细对浮选效果的影响,从不同细度颗粒的几何特征、润湿热及浮选行为3方面探讨了炼焦中煤的尺度效应。使用BET比表面测定仪、微量热仪分别研究了炼焦中煤粒度减小对其比表面积、总孔容和平均孔径及润湿热的影响,用Young-Laplace方程分析了基于毛细管作用捕收剂吸附的变化,通过半经验公式计算了颗粒粒径及润湿性对上浮概率的影响,并进行了不同细度超低灰精煤的浮选试验。研究表明,随着炼焦中煤粒度的变细,其比表面积和总孔容呈数倍增大,Ⅱ类孔增多,平均孔径增加;基于毛细管作用的捕收剂吸附增强,对去离子水的润湿热值急剧降低;存在最佳粒度范围使颗粒的上浮概率最大,中等紊流强度的浮选环境中,控制疏水颗粒粒径在-200+45μm或亲水性颗粒粒径在-10μm或+45μm均可强化浮选回收。相同浮选药剂条件下,煤泥粒度越细,煤的回收率越难以保障,并且水回收率呈增加趋势,浮选效率降低。
  • Abstract
    In order to investigate the effect of particle size on flotation of coal,particles’ scale effect is exposited with geometric characteristics,interface chemistry and flotation behavior of particles. Changes of specific surface area,total pore volume,average pore size and wetting heat with particle size were investigate dusing BET specific surface instru- ment and micro calorimeter,respectively. Young-Laplace equation was used to analyze the capillary effect of collector adsorption. Effect of particle size and wettability on floatation probability was calculated by experience theory. Also,the flotation test of ultra-clean coal with different sizes was conducted. With the decrease of size fraction,specific surface area and total pore volume increase several times. At the same time,the pore of Ⅱ type increases,the average pore size becomes larger,and the adsorption of collector on the account of capillarity is enhanced. Wetting heat of fine coal frac- tions by deionized water reduces rapidly. Floatability of particles would be the largest in a proper size range. In moder- ate turbulence intensity flotation environment,keeping the hydrophobic particles in size range of -200+45 μm or hy- drophilic particles in size range of -10 μm or +45 μm will enhance the fine coal flotation. From the flotation results of ultra-clean coal and flotation middlings with different fineness,it is concluded that with the decrease of particle size, the coal recovery reduces,water recovery increases,and flotation efficiency becomes lower under the same flotation reagent.
  • 关键词

    炼焦中煤尺度效应浮选

  • KeyWords

    coking coal middlings;particles’ scale effect;flotation

  • 基金项目(Foundation)
    国家重点基础研究发展计划(973)资助项目(2012CB214905);中国博士后科学基金资助项目(2015M570937);中央高校基本科研业务费专项资金资助项目(FRF-TP-15-049A1);
  • DOI
  • Citation
    Zou Wenjie,Cao Yijun,Sun Chunbao. Scale effect of coking coal middlings and its influence on flotation[J]. Journal of China Coal Socie- ty,2016,41(2):469-474.
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