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Understanding Interactions between Clay and Model Coal Surfaces in Electrolyte Solutions by a Quartz Crystal Microbalance with Dissipation Study

机译:通过耗散研究了解石英晶体微量天平研究电解质溶液中粘土和模型煤表面之间的相互作用

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摘要

Clay slime coating is known to have a negative impact on coal flotation. It is therefore of great importance to study interactions between clay and coal under flotation conditions. In this study, the effect of electrolytes on the interactions, of montmorillonite (MMT) clays with carbon or asphaltenes on sensor surfaces of quartz crystal microbalance with dissipation (QCM-D) as model coal was investigated. Ion beam sputtering deposition and spin coating methods were used to prepare carbon and asphaltene (a class of natural polyaromatic compounds) surfaces. The prepared surfaces were characterized by Raman spectroscopy. QCM-D was used to determine in situ interactions between MMT clays and model coal surfaces in electrolyte aqueous solutions. The MMT clays were shown to deposit significantly on the model coal surfaces only in the presence of NaCl or CaCl2 as a result of the compression of electrical double layers. Moreover the enhanced deposition by calcium ions is stronger than by sodium ions. The results from this fundamental study provide a better understanding of the critical role of water chemistry in modulating the interactions of clays with coal surfaces and scientific guidance to achieve better performance of fine coal flotation.
机译:已知粘土泥涂料对煤浮选有负面影响。因此,研究浮选条件下粘土与煤之间的相互作用非常重要。在这项研究中,研究了电解质对蒙脱石(MMT)粘土与碳或沥青质在模型耗散的石英晶体微天平(QCM-D)传感器表面上的碳或沥青质之间相互作用的影响。离子束溅射沉积和旋涂方法用于制备碳和沥青质(一种天然的多芳族化合物)表面。通过拉曼光谱对制备的表面进行表征。 QCM-D用于确定电解质水溶液中MMT粘土与模型煤表面之间的原位相互作用。结果表明,由于双电层的压缩,MMT粘土仅在存在NaCl或CaCl2的情况下才会在模型煤表面上大量沉积。而且,钙离子增强的沉积比钠离子增强。这项基础研究的结果可以更好地理解水化学在调节粘土与煤表面的相互作用中的关键作用,并为获得更好的精煤浮选性能提供科学指导。

著录项

  • 来源
    《Energy & fuels》 |2018年第1期|233-240|共8页
  • 作者单位

    Tsinghua Univ, Inst Nucl & New Energy Technol, Beijing 100084, Peoples R China;

    Tsinghua Univ, Inst Nucl & New Energy Technol, Beijing 100084, Peoples R China;

    Tsinghua Univ, Inst Nucl & New Energy Technol, Beijing 100084, Peoples R China;

    Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 1H9, Canada;

    Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 1H9, Canada;

    Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 1H9, Canada;

    Tsinghua Univ, Inst Nucl & New Energy Technol, Beijing 100084, Peoples R China;

    Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China;

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

  • 入库时间 2022-08-18 00:39:06

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