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Effect of multi-intensification on the liberation of maceral components in coal

机译：多次强化对煤中显微组分释放的影响

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摘要

In order to achieve high-quality coal resources in western China, this study focused on a coal sample from the Shangwan Coal Mine, owned by the China Shendong Group, and employed scanning electron microscopy (SEM), mineral liberation analysis (MLA), and maceral component quantitative analysis for investigating the coal sample's liberation characteristics and crack distribution patterns after pre-grading and microwave processing. The results show that the physical properties of coal maceral components significantly affected the related enrichment performances, and many intra-group and inter-group cracks were produced under the induction of microwave radiation. The cracks then developed and stopped growing among the different maceral components and mineral components, thereby inducing selective and random pulverization along the crack growth direction in further pulverization process and effectively enhancing the liberation properties of different components. Using the Sandbox method, the fractal dimension of the cracks on the particle surface was calculated to be 1.01, which confirmed the self-similarly of the cracks on the coal surface. Multi-intensification maceral liberation also yielded favorable grading performances. The inertinite content was the highest (75.23%) in grade-3 product, while the vitrinite content was the highest (66.3%) in grade-1 product; the corresponding enrichment ratios were 2.15 and 1.59, respectively. Moreover, the ash content in grade-2 product was the lowest, which dropped by 3.61% compared with that in raw coal sample.
机译：为了获得中国西部的优质煤炭资源，本研究集中于中国神东集团拥有的上湾煤矿的一个煤样，并采用扫描电子显微镜（SEM），矿物释放分析（MLA）和成分定量分析，用于研究预分选和微波处理后煤样品的释放特性和裂纹分布模式。结果表明，煤基化学成分的物理性能显着影响了相关的富集性能，在微波辐射的诱导下产生了许多组内和组间裂纹。然后，裂纹在不同的宏观组分和矿物组分之间发展并停止生长，从而在进一步的粉碎过程中沿裂纹扩展方向诱导选择性的随机粉碎，并有效增强了不同组分的释放性能。使用沙箱法，计算出颗粒表面裂纹的分形维数为1.01，证实了煤表面裂纹的自相似性。多种强化的Maceral解放也产生了良好的分级性能。三年级产品中的惰质含量最高（75.23％），而三年级产品中的镜质含量最高（66.3％）。相应的富集比分别为2.15和1.59。此外，二级产品中的灰分含量最低，与原煤样品相比下降了3.61％。

著录项

  • 来源
    《Fuel》 |2019年第1期|1003-1012|共10页
  • 作者

    Li Zhen; Fu Yanhong; Zhou Anning; Zhu Changyong; Yang Chao; Shen Ning; Yang Cheng;

  • 作者单位

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

    Taixi Coal Washery Plant Shen Hua Ningxia Coal In, Ningxia 753000, Peoples R China;

    Minist Land & Resources, Key Lab Coal Resources Explorat & Comprehens Util, Xian 710054, Shaanxi, Peoples R China;

    Xian Univ Sci & Technol, Coll Chem & Chem Engn, Xian 710054, Shaanxi, 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

    Maceral components; Liberation; MLA; Microwave processing; Multi-intensification;

    机译：宏观成分;解放;MLA;微波处理;多重强化;

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