| 1 | Structure of the organic crystallite unit in coal as determined by X-ray diffraction显示文摘X-ray diffraction (XRD) was used to study the structure of the organic crystallite unit (La, Lc, d002) in coals collected from Henan and Shanxi Provinces. XRD patterns of coal were collected in a step-scan mode (0.1°/step) over an angular range of 2-90° (2h), allowing 8 s at each step. The structure of the crystallite unit was determined from the Scherrer equation and peak parameters deduced from whole pattern fit- ting. The results show that the structure of the crystallite unit in coal is mainly controlled by the coal rank. As the coal rank increases the average diameter of a coal crystallite unit (La) increases, the inter- layer spacing (d002) decreases slightly, and the average height of a coal crystallite unit (Lc) increases at first but then decreases. A new diffraction peak from the crystallite unit in coal was found at a low scat- tering angle in the XRD pattern (2-10°). This suggests a structure with an inter-layer spacing from 1.9 to 2.8 nm exists in coal crystallites. | Song Dangyu Yang Cunbei Zhang Xiaokui Su Xianbo Zhang Xiaodong | 2011 | Mining Science and Technology2011，21，5： | 12 |
| 3 | Geochemistry of Mercury in the Permian Tectonically Deformed Coals from Peigou Mine, Xinmi Coalfield, China显示文摘As the mercury emitted from coal combustion can lead to serious environmental issues, researchers pay more attention to the content, distribution and occurrence of mercury in coal. In this paper, the content, distribution, and occurrence of mercury in the Permian tectonically deformed coals from Peigou Mine, Xinmi coalfield, Henan Province were investigated. A total of 18 bench samples were taken from No.2-1 coals seam in Peigou Mine, including 15 coal bench samples, two roofs and one floor. The mercury concentration, mineral composition, and main inorganic element content of 18 samples were determined by DMA-80 direct mercury analyzer, XRD, and XRF respectively. The results show that the mercury content ranges from 0.047 ppm to 0.643 ppm, with an average of 0.244 ppm. Though the coal seam has turned into typical tectonically deformed coal by the strong tectonic destruction and plastic deformation, the vertical distribution of mercury has remarkable heterogeneity in coal seam section. By the analysis of correlation between mercury and the main inorganic elements and the mineral composition in coal, we infer that majority of mercury mainly relates to pyrite or kaolinite. | SONG Dangyu LI Chunhui SONG Boyi YANG Cunbei LI Yunbo | 2017 | Acta Geologica Sinica(English Edition)2017，91，6： | 0 |
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