| Occurrence and migration of hazardous trace elements in coals from Guizhou Province, China |
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| 作者姓名： | Dangyu SONG Junying ZHANG Chuguang ZHENG |
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| 作者单位： | State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China |
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| 摘 要： | Coals from Guizhou Province, Southwest China, attract many researchers＇ attention for their high concentrations of hazardous trace elements, sulphur and mineral components. Trace elements in coals have diverse modes of occurrence that will greatly influence their migration in the process of coal preparation. Mode of occurrence is also important in determining the partitioning during coal combustion. The coal floatation test by progressive release was used to study the migration of trace elements and mineral components in the process of froth floatation. Inductively coupled plasma mass spectrometry （ICP-MS） was used to determine the absolute concentrations of trace elements including As, Be, Cd, Co, Cr, Cu, Mn, Mo, Ni, Pb, Sb, Se, Th, U, V and Zn in the parent coals and the floatation fractions. Precise determination of the mineral matter percentage in coals was obtained by low-temperature ashing. The mineral compositions in coals were quantified using Rietveld-based X-ray diffraction analysis package on low-temperature ash. Scanning electron microscope equipped with energy dispersive X-ray detector was used to provide information on the forms of occurrence of mineral components in coal. Five floatation fractions were obtained from the pulverized coal samples. The contents of trace elements and mineral components decrease from the first tailings to the last cleaned coal. The concentrations of trace elements and mineral components in parent coals and different floatation samples show that trace elements and mineral components are mainly concentrated in the first tailings samples. Nearly 60% of mineral components are enriched in the first tailings, whereas less than 1.3% remains in the cleaned coal. The ratio of sixteen trace elements concentrations in the first tailings to the corresponding concentrations in the cleaned coal ranges from 1.6 to 22.7. Quantitative mineralogical analysis results using the full-profile general structure analysis system （GSAS） showed that the main compositions of LTA include quartz, calcite, kaolinite, pyrite, chlorite, montmorillonite, illite, anatase and pyrite.
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| 关 键 词： | 微量元素 矿物成分 浮选 煤 贵州 |
Occurrence and migration of hazardous trace elements in coals from Guizhou Province, China |
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| Dangyu SONG Junying ZHANG Chuguang ZHENG.Occurrence and migration of hazardous trace elements in coals from Guizhou Province, China[J].Chinese Journal of Geochemistry,2006,25(B08):176-177. |
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| Abstract: | |
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| Keywords: | trace element mineral component floatation occurrence migration |
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