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Wettability and flotation modification of long flame coal with low- temperature pyrolysis

机译：低温热解长焰煤的润湿性和浮选改性

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摘要

The purpose of this investigation was to explore the effect of low-temperature pyrolysis on the wettability and floatability of the long-flame low-rank coal particles. Changes in surface functional groups of long-flame coal were measured before and after pyrolysis and the surface free energy of the coal particles was calculated by the van Oss-Chaudhury-Good theory. As the pyrolysis temperature was increased to 500 degrees C, the total surface free energy. S and the base part gamma(-)(S) of the long-flame coal decreased from 42.63 to 41.26 mN.m(-1) and from 28.19 to 2.18 mN.m(-1), respectively. The reductions in gamma(S) and gamma(-)(S) indicated a significant increase in hydrophobicity of the long-flame coal after pyrolysis. In addition, the wetting heat of the coal became less negative, indicating significant restriction of the hydrophilicity of the coal surface. The zeta potential of the coal was measured before and after pyrolysis; pyrolysis significantly affected the coal's zeta potential, which became less negative as the pyrolysis temperature was increased. Thus, the electrostatic repulsion between bubbles and coal particles decreased after pyrolysis, and therefore the attachment time of bubbles to coal particles decreased by up to 72.73%. The flotation recovery of the coal particles increased by up to 38.20% as the pyrolysis temperature was increased to 500 degrees C.
机译：这项研究的目的是探讨低温热解对长焰低阶煤颗粒的润湿性和漂浮性的影响。测量了长焰煤热解前后表面官能团的变化，并利用van Oss-Chaudhury-Good理论计算了煤颗粒的表面自由能。随着热解温度增加到500摄氏度，总表面自由能。长燃煤的S和基部γ（-）（S）分别从42.63降至41.26 mN.m（-1）和从28.19降至2.18 mN.m（-1）。 γ（S）和γ（-）（S）的降低表明，经热解后，长焰煤的疏水性显着提高。另外，煤的湿热变小为负，表明煤表面的亲水性受到明显限制。在热解之前和之后测量煤的ζ电势。热解显着影响了煤炭的ζ电势，随着热解温度的升高，其负电性变小。因此，热解后气泡与煤颗粒之间的静电排斥力降低，因此气泡与煤颗粒的附着时间减少了多达72.73％。随着热解温度提高到500摄氏度，煤颗粒的浮选回收率提高了38.20％。

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  • 来源
    《Fuel》 |2018年第1期|135-140|共6页
  • 作者

    Zhen Kunkun; Zheng Changlong; Li Chenwei; Zhang Haijun;

  • 作者单位

    China Univ Min & Technol, Sch Chem Engn & Technol, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Sch Chem Engn & Technol, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Sch Chem Engn & Technol, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Chinese Natl Engn Res Ctr Coal Preparat & Purific, Xuzhou 221116, Jiangsu, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Long-flame coal; Low-temperature pyrolysis; Surface free energy; Wetting heat; Bubble-particle attachment;

    机译：长燃煤;低温热解;表面自由能;湿热;气泡-颗粒附着;

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