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首页> 外文期刊>Fuel >Predictions of triboelectrostatic separation of minerals in low-rank coal based on surface charging characteristics in relation to their structures
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Predictions of triboelectrostatic separation of minerals in low-rank coal based on surface charging characteristics in relation to their structures

机译：基于表面电荷特性及其结构的低阶煤矿物摩擦静电分离预测

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摘要

Clay minerals are the inorganic components in low-rank coal, which are particularly hard to remove as they commonly stick to the organic carbonaceous parts. Surface tribocharging characteristics including charge-to-mass ratio and specific resistivity of three typical minerals (kaolinite, montmorillonite and quartz) and clean coal under different relative humidity and temperature conditions were investigated in the present study for the prediction and evaluation of their effect on triboelectrostatic separation. X-ray diffraction (XRD) and X-ray fluorescence (XRF) were applied to minerals for phase and element identification, their microstructures features were also provided for supplementary analyses. Four candidate materials (stainless steel, copper, polyvinyl chloride and polyamide) for tribo-charger were arranged in charge-to-mass ratio measurements. Stainless steel would be the best choice for tribocharging three minerals and clean coal, which could be gathered in opposite plates with a considerable charge gap. Copper could also be a good choice in dry ambient atmosphere. In both comparison of charge-to-mass ratio and specific resistivity, separation efficiency order of three minerals were same in predictions as kaolinite > quartz > montmorillonite. Montmorillonite is weak in charging and holding charges, and the most likely factors should be its interlayer swelling with water molecules and greater isomorphous substitution, which makes it the hardest to separate from coal among three minerals. A basic separating could be achieved if the relative humidity is kept in low range but better results need to be reached under higher environmental temperature.
机译：粘土矿物是低阶煤中的无机成分，由于它们通常会粘附在有机碳质零件上，因此特别难以去除。研究了三种典型矿物（高岭石，蒙脱土和石英）和清洁煤在不同相对湿度和温度条件下的表面摩擦充电特性，包括电荷质量比和电阻率，以预测和评估其对摩擦静电的影响分离。将X射线衍射（XRD）和X射线荧光（XRF）应用于矿物进行相和元素鉴定，并提供其微观结构特征以进行补充分析。在电荷质量比测量中，布置了用于摩擦充电器的四种候选材料（不锈钢，铜，聚氯乙烯和聚酰胺）。不锈钢是对三种矿物和清洁煤进行摩擦装填的最佳选择，它们可以聚集在相对的板中，且带隙很大。在干燥的环境中，铜也是一个不错的选择。在电荷质量比和电阻率的比较中，三种矿物的分离效率顺序与高岭石>石英>蒙脱石的预测相同。蒙脱土的电荷和保持电荷较弱，最可能的因素应该是其层间与水分子溶胀和更大的同构取代度，这使其在三种矿物中最难与煤分离。如果相对湿度保持在较低范围内，则可以实现基本的分离，但是在较高的环境温度下需要达到更好的结果。

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  • 来源
    《Fuel》 |2020年第15期|116824.1-116824.9|共9页
  • 作者

    He Xin; Sun Hao; Wang Wenfeng; Zhang Xinxi;

  • 作者单位

    China Univ Min & Technol Minist Educ Key Lab Coalbed Methane Resources & Reservoir For Xuzhou 221008 Jiangsu Peoples R China|China Univ Min & Technol Sch Resources & Geosci Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Minist Educ Key Lab Coal Proc & Efficient Utilizat Xuzhou 221116 Jiangsu Peoples R China|China Univ Min & Technol Sch Chem Engn & Technol 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

    Low-rank coal; Clay minerals; Triboelectrostatic separation; Charging characteristics; Clean coal;

    机译：低阶煤粘土矿物;摩擦静电分离;充电特性;清洁煤;

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