内蒙古伊敏煤田五牧场区12~#煤的地球化学特征

发布时间：2018-05-01 05:03

本文选题：伊敏 + 地球化学　；参考：《河北工程大学》2017年硕士论文

【摘要】：在煤炭资源占据主导地位的中国,对煤的地球化学特征的深入研究显得尤为重要,不但可以促进煤炭资源综合利用,还能有效减少并且防治煤中有害成分对环境生活的影响。本文主要以地球化学、煤地质学、煤岩学、矿物学等学科理论为指导,利用X射线荧光光谱分析、电感耦合等离子体质谱仪、偏光显微镜、X射线衍射分析、扫描电镜、SPSS、CAD等实验仪器和分析软件,对五牧场区12#煤的煤岩特征和伴生元素地球化学特征作了初步探讨和研究。研究结果表明:(1)五牧场区12#煤的镜质组反射率为0.77%,属于中低阶变质烟煤。镜质组平均含量为84.40%;壳质组平均含量为2.06%;惰质组平均含量为13.54%;基质镜质体是镜质组的主要组成组分,惰质组中以碎屑惰质体和丝质体为主,小孢子是壳质组的主要组分。12#煤属于中高挥发分、低灰、低硫煤。(2)五牧场区12#煤煤中矿物主要为陆源碎屑成因的粘土矿物和自生成因的方解石,其次为自生成因的黄铁矿,少量陆源碎屑成因的石英等,粘土矿物以高岭石为主,呈分散状或填充在胞腔中;煤相类型为低位泥炭沼泽,煤层形成于水流活动性较强,或者风动力作用较强的环境中,在凝胶化过程中植物细胞组织受到强烈的破坏。(3)煤中微量元素V、Ga轻度富集,Li、Be、Cr、Ni、Sr、Cs的含量属于正常范围。有害元素V、Cr、Ni、在矸石及底部煤层中含量较高,出现异常富集,需要采取相应防治措施减少其对外界的危害。(4)除Cr、Ni、Ba、Zn外,其他微量元素均赋存状态和硅铝酸盐相关性较高,且煤中REY与粘土矿物关系紧密,有益元素Ga主要也赋存在粘土矿物中,并以高岭石为载体;除去矸石、夹矸和顶板外,12#煤下部的煤层分层中微量元素的总体含量要高于上部煤层分层的含量,其中Ga元素在煤层下部,矸石和夹矸附近的煤层TD12-1,TD12-2,TD12-3,TD12-5,TD12-6和TD12-7这六个分层中异常富集,平均含量达到52.3μg/g,超出我国煤中镓的工业品位边界值(30μg/g)。
[Abstract]:In China, where coal resources occupy a dominant position, it is particularly important to study the geochemical characteristics of coal, which can not only promote the comprehensive utilization of coal resources, but also effectively reduce and prevent the influence of harmful components in coal on the environment and life. Guided by the theories of geochemistry, coal geology, coal petrology and mineralogy, this paper uses X-ray fluorescence spectroscopy, inductively coupled plasma mass spectrometer, polarizing microscope and X-ray diffraction analysis. The characteristics of coal rock and associated element geochemistry of 12# coal in Wuchang area were preliminarily discussed and studied by scanning electron microscope (SEM), SPSS CAD and other experimental instruments and analysis software. The results show that the vitrinite reflectance of No. 12# coal in the area is 0.77, which belongs to the middle and low rank metamorphic bituminous coal. The average content of vitrinite group was 84.40; the average content of shell group was 2.06; the average content of inertinite group was 13.54; the matrix vitrinite was the main component of vitrinite group, and the main components of inertinite group were clastic inertinite and filamentous body. Microspore is the main component of the crustal formation .12# coal belongs to middle and high volatile, low ash and low sulfur coal.) the minerals in the coal of No. 12# are mainly clay minerals of continental clastic origin and authigenic calcite, followed by authigenic pyrite. A small amount of continental clastic quartz, the clay minerals are mainly kaolinite, dispersed or filled in the cell cavity, the coal facies type is low peat swamp, the coal seam is formed in the environment where the flow activity is strong or the wind is strong. During the gelation process, the plant cell tissue was destroyed strongly. The harmful element V _ (+) Cr ~ (2 +) Ni, which has a high content in gangue and coal seams at the bottom, is abnormally enriched, so it is necessary to take corresponding preventive measures to reduce its harm to the outside world. (4) except for Cr _ (1) Ni _ (+) Ba ~ (2 +) Zn, the occurrence state of other trace elements is highly correlated with aluminosilicate. The REY in coal is closely related to clay minerals, and the beneficial element Ga also exists mainly in clay minerals, and kaolinite is used as carrier, and gangue is removed. The total content of trace elements in the stratification of gangue and coal seam 12# outside roof is higher than that in the upper coal seam, in which Ga element is in the lower coal seam, and in the coal seam TD12-1 TD12-2TD12-3, TD12-5TD12-6 and TD12-7 in the coal bed near gangue and gangue, the content of trace elements is abnormally enriched. The average content of gallium is 52.3 渭 g / g, which is 30 渭 g / g above the industrial grade boundary value of gallium in China.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.11

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