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Wetting of coal pores characterized by LF-NMR and its relationship to flotation recovery

机译：LF-NMR表征的煤孔润湿及其与浮选回收率的关系

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摘要

The wetting of coal pores by water has an observable influence on the flotation recovery of combustible matter from fine coal resources. In this investigation, low-field nuclear magnetic resonance (LF-NMR) was employed to measure the porosity of coal pores after various pre-conditioning times; the water wetting degree of coal pores was then characterized using this porosity data. The water wetting percentage of coal pores was calculated by using the ratio of the measured porosity to the total porosity (obtained from a water-saturated coal sample). The water-saturated coal sample had a total porosity of 23.22%, which was dominated by mesopores and macropores. The measured porosity of the coal surface increased from 11.33% to 15.37% as the pre-conditioning time was increased from 0 to 10 min, and the flotation recovery was reduced from 65.23% to 21.58%. The water wetting degree of the macropores was found to have a stronger negative effect on the coal flotation than that of the mesopores. The larger pores were more easily wetted by water than the smaller pores, resulting in the formation of a thick hydration layer on the coal surface, which reduced the floatability of coal particles. Additionally, the negative linear correlation between the water wetting percentage of the coal pores and the flotation recovery was determined to elucidate the effects of the water wetting of the coal pores on its flotation behavior.
机译：用水润湿煤孔对从细煤资源中浮选可燃物具有明显的影响。在这项研究中，采用低场核磁共振（LF-NMR）来测量经过各种预处理时间后的煤孔孔隙度。然后利用该孔隙率数据表征煤孔隙的水润湿度。通过使用测得的孔隙率与总孔隙率（从水饱和的煤样品中获得）的比率来计算煤孔隙的水润湿百分比。水饱和煤样品的总孔隙率为23.22％，其中以中孔和大孔为主。随着预处理时间从0分钟增加到10分钟，煤表面的孔隙率从11.33％增加到15.37％，浮选回收率从65.23％降低到21.58％。发现大孔的水润湿度对煤浮选的负面影响强于中孔。与较小的孔相比，较大的孔更容易被水润湿，从而导致在煤表面上形成厚的水化层，从而降低了煤颗粒的漂浮性。另外，确定了煤孔的水润湿百分比与浮选回收率之间的负线性相关，以阐明煤孔的水润湿对其浮选行为的影响。

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  • 来源
    《Fuel》 |2020年第jul15期|117737.1-117737.7|共7页
  • 作者

  • 作者单位

    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

    LF-NMR; Porosity; Water wetting degree; Coal flotation;

    机译：LF-NMR;孔隙率水润湿度;煤浮选;

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