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Experimental study on the preconditioning of fine coal particles surface modification using a new type flow mixer

机译:新型流动搅拌机细煤颗粒表面改性的预处理试验研究

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摘要

The preconditioning process prior to flotation separation has crucial effects that increase the hydrophobicity difference between coal and minerals. In this study, a new type of flow mixer without an agitator was designed to conduct preconditioning experiments of fine coal particles with different conditioning times. The hydrophobicity enhancement of the conditioned coal was quantitatively characterized by the contact angle and induction time analyses with appropriate conditioning time. The Fourier transform infrared and X-ray photoelectron spectroscopy measurement results indicated that the fluid intensification for coal surface modification principally appeared as surface cleaning and interaction improvement between the collector and coal particles. The flotation performance of a seven-minute conditioning, such as the flotation recovery and rate, was comprehensively better than that of other conditions, and the flotation process was more reasonable to be described using the matrix first-order model. The particle size distributions in the flotation products experienced three main changing stages of the fine-intermediate-coarse size fractions. The scanning electron microscopy-energy dispersive spectroscopy results further demonstrated the positive effects of fluid intensification on the surface microcosmic characteristics by the seven-minute conditioning.
机译:在浮选分离之前的预处理过程具有增加煤和矿物质之间的疏水性差异的关键影响。在该研究中,设计了一种没有搅拌器的新型流动混合器,用于对具有不同调节时间的细煤颗粒进行预处理实验。通过适当的调理时间定量表征调节煤的疏水性增强。傅里叶变换红外线和X射线光电子能谱测量结果表明,煤表面改性的流体强化主要出现在收集器和煤颗粒之间的表面清洁和相互作用。七分钟调节的浮选性能,例如浮选回收率和速率,比其他条件的全面更好,并且更合理地使用矩阵一阶模型来描述浮选过程。浮选产品中的粒度分布经历了三个主要中间粗尺寸级分的主要变化阶段。扫描电子显微镜 - 能量色散光谱结果进一步证明了通过七分钟调理的流体强化对表面微观特征的积极影响。

著录项

  • 来源
    《Fuel》 |2020年第may15期|117361.1-117361.10|共10页
  • 作者单位

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

    China Univ Min & Technol Sch Chem Engn & Technol Xuzhou 221116 Jiangsu Peoples R China|Univ Alberta Dept Chem & Mat Engn Edmonton AB T6G 1H9 Canada;

    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

    Preconditioning; Flow mixer; Surface modification; Flotation separation;

    机译:预处理;流动混合器;表面改性;浮选分离;

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