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首页> 外文期刊>Journal of Analytical & Applied Pyrolysis >The volatilization of trace elements during oxidative pyrolysis of a coal from an endemic arsenosis area in southwest Guizhou, China
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The volatilization of trace elements during oxidative pyrolysis of a coal from an endemic arsenosis area in southwest Guizhou, China

机译：贵州西南部地方性砷中毒地区煤的氧化热解过程中微量元素的挥发

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摘要

Household coal combustion has caused endemic poisoning in southwest Guizhou Province of China. The mineralogy, geochemistry and mode of occurrence of trace elements (TEs) of coal from this area were examined, and oxidative pyrolysis experiments of the coal were conducted in a box resistance reactor at 300-1200 ℃ to evaluate the volatilization of trace elements. In coal. As, Sb, Pb, Zn, W, Mo, and Cr are highly enriched when compared to both the world coal and Chinese coal. Cadmium, Sr, and Ba are all slightly higher than the average value for Chinese coal. The volatility of trace elements exhibits a close correlation with the mode of element occurrence. The considerable volatilization of As, Sb, Pb, Zn, Cd and Cr below 450 ℃ is thought to be related to the organic form of these elements. In the temperature range of 450-1200 ℃, the volatility of all trace elements except As increases slowly with temperature because these elements are highly associated with silicates. Among the hazardous trace elements, As is the most volatile, and Sb, Pb, Zn, Cd and Cr are moderately volatile. Arsenic exhibits a uniquely high release at 900-1000 ℃, which could be attributed to the high proportion of As association with sulfide. Because TEs are primarily inorganically-associated, the volatilization of TEs is not comparable to the loss of coal weight during pyrolysis. At high temperatures, a significantly low coal weight loss can result in a significant volatility of TEs.
机译：家庭燃煤已在中国贵州西南部地区引起地方性中毒。研究了该地区煤炭的矿物学，地球化学特征和微量元素（TEs）的产生方式，并在箱式电阻反应器中于300-1200℃进行了煤炭的氧化热解实验，以评估微量元素的挥发。在煤中。与世界煤炭和中国煤炭相比，砷，铅，锌，钨，钼和铬的含量都很高。镉，锶和钡均略高于中国煤炭的平均值。微量元素的挥发性与元素的发生方式密切相关。在450℃以下，As，Sb，Pb，Zn，Cd和Cr的大量挥发被认为与这些元素的有机形式有关。在450-1200℃的温度范围内，除As以外的所有微量元素的挥发性都随温度缓慢增加，因为这些元素与硅酸盐高度相关。在危险的痕量元素中，As是最易挥发的，而Sb，Pb，Zn，Cd和Cr的挥发度中等。砷在900-1000℃时具有独特的高释放性，这可能归因于砷与硫化物的缔合比例很高。由于TEs主要是无机缔合的，因此TEs的挥发与热解过程中煤重量的损失不相称。在高温下，煤的重量损失非常低，会导致TE的挥发度很大。

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  • 来源
    《Journal of Analytical & Applied Pyrolysis》 |2012年第11期|184-193|共10页
  • 作者

    Xiaofei Wei; Guoping Zhang; Yongbing Cai; Ling Li; Haixia Li;

  • 作者单位

    State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China,Graduate University of Chinese Academy of Sciences, Beijing 100049, China;

    State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;

    State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China,Graduate University of Chinese Academy of Sciences, Beijing 100049, China;

    State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;

    State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China,Graduate University of Chinese Academy of Sciences, Beijing 100049, 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

    coal; pyrolysis; trace elements; arsenic; volatilization;

    机译：煤;热解微量元素;砷;挥发;

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