准格尔煤田串草圪旦5号煤有害元素赋存状态和分布规律
发布时间：2018-08-02 19:54
【摘要】：准格尔煤田位于鄂尔多斯盆地东缘,是盆地的重要组成部分,属于晚古生代石炭—二叠纪特大型煤田,含煤层系包括上石炭统本溪组、太原组和下二叠统山西组,含煤岩系总厚110~160 m,煤系地层的基底为中奥陶统石灰岩,其上覆地层为下石盒子组、上石盒子组、石千峰组、刘家沟组等非含煤地层。串草圪旦煤矿,位于准格尔煤田东南部,北邻哈儿乌素露天煤矿,南接河东煤田,主采煤层为山西组的4、5号煤层和太原组的6、9号煤层,煤层厚度大,层间距小,且地质及水文条件简单,顶底板以粉砂岩为主。以准格尔煤田串草圪旦5号煤为研究对象,综合运用煤岩学、矿物学、煤地球化学方法对5号煤的煤岩煤质特征、矿物学及地球化学特征进行分析研究,取得了如下认识:(1)5号煤以半亮型煤和半暗型煤为主,其次为光亮型煤,少见暗淡型煤;半镜质组含量较高;高灰分、中挥发分、低水分的煤质特征;硫含量较低,为特低硫煤。(2)5号煤中发育高岭石、磁铁矿、石英、方解石、黄铁矿、石膏等多种矿物,其中高岭石极其发育,平均含量达到矿物总量的97.92%;磁铁矿次之,其余矿物只在个别样品中被检测到。(3)分析测试了5号煤中常量元素,Si O2、Al2O3含量(平均为51.70%、42.42%)远高于其他元素;其次为Fe2O3和Ti O2(平均含量为1.99%、1.67%);Ca O、K2O、Mg O、Na2O、P2O5的含量较低。(4)Hg、Be、F、U在煤中富集,平均含量较高;As的含量较低。其他的微量元素中,Li、Ni、Se、Zr、Nb、Cd等元素在煤中含量较高,而Cr、Sr等元素含量较低。(5)通过对煤中有害元素与煤物质组成的相关关系研究,结合R型聚类与元素共生组合相关分析,Be、As、U在煤中主要为有机结合态赋存;F在煤中主要为无机结合态;Hg于煤中以硫化物结合态赋存。(6)通过w(Sr)/w(Ba)、w(V)/w(Ni)、w(V)/w(V+Ni)、w(Sr)/w(Cu)、∑REE等地球化学指标,对煤层形成时的沉积环境、水体条件进行了定性分析,认为研究区在晚古生代末期泥炭沼泽受海水影响,还原性较强,古盐度较高,造成了5号煤中Li、Be、F、Ni、Se、U等元素的相对富集,而As、Sr、Sb、Cs等元素相对贫乏。
[Abstract]:The Zhunger coalfield is located in the eastern margin of the Ordos basin and is an important part of the basin. It belongs to the late Paleozoic Carboniferous Permian super-large coalfield. The coal-bearing system includes the Upper Carboniferous Benxi formation, the Taiyuan formation and the Lower Permian Shanxi formation. The total thickness of coal-bearing rock series is 110 ~ 160m, and the basement of coal-measure strata is middle Ordovician limestone. The overlying strata are the Lower Shihezi formation, the Upper Shihezi formation, the Shiqianfeng formation, the Liujiagou formation and other non-coal-bearing strata. Chuancao Gedan coal mine is located in the southeast of Zhunger coalfield, in the north adjacent to Haliwusu opencast coal mine, and in the south of Hedong coalfield. The main coal seam is coal seam No. 4, No. 5 of Shanxi formation and seam No. 6 and No. 9 of Taiyuan formation. The thickness of coal seam is large and the interval between layers is small. The geological and hydrological conditions are simple and siltstone is the main roof and bottom plate. Taking Chuancao Gedan 5 coal in Zhunger coalfield as the research object, coal petrology, mineralogy and coal geochemistry are used to analyze and study the coal and rock coal quality characteristics, mineralogical and geochemical characteristics of No. 5 coal. The following understandings have been obtained: (1) No. 5 coal is mainly semi-bright briquette and semi-dark briquette, followed by bright briquette, rare dim briquette, high semi-vitrinite content, high ash content, medium volatile content, low moisture content, low sulfur content, (2) kaolinite, magnetite, quartz, calcite, pyrite, gypsum and other minerals are developed in No. 5 coal, among which kaolinite is extremely developed with an average content of 97.92% of the total mineral amount, and magnetite is the second. The other minerals were only detected in individual samples. (3) the content of the constant element (42.42%) in No. 5 coal was much higher than that of the other elements, followed by Fe2O3 and TIO _ 2 (average 1.991.67%). (4) the content of Fe2O3 and TIO _ 2 (the average content was 1.991.67%) was relatively low. (4) the content of Fe2O3 and TIO _ 2 was relatively low in coal. (4) the content of Fe2O3 and TIO _ 2 was higher than that of other elements. (4) the content of Fe2O3 and TIO _ 2 (the average content was 1.991.67%) was lower than that of other elements. (4) the content of Fe2O3 and TIO _ 2 was relatively low in coal. The average content is higher and the content of as is lower. The content of other trace elements, such as Li-NiNiSe, ZrZrNb-CD and so on, is higher in coal, but the content of Cr-Sr is lower. (5) the correlation between harmful elements in coal and the composition of coal is studied. In combination with the correlation analysis of R-type clustering and elemental symbiosis assemblage, the main organic binding forms of Bea Asau in coal are inorganic bound Hg and sulfide-bound Hg in coal. (6) geochemical indexes such as w (Sr) / w (Ba) / w (V) / w (Ni) / w (V Ni) / w (Sr) / w (Cu), 鈭，
本文编号：2160554
[Abstract]:The Zhunger coalfield is located in the eastern margin of the Ordos basin and is an important part of the basin. It belongs to the late Paleozoic Carboniferous Permian super-large coalfield. The coal-bearing system includes the Upper Carboniferous Benxi formation, the Taiyuan formation and the Lower Permian Shanxi formation. The total thickness of coal-bearing rock series is 110 ~ 160m, and the basement of coal-measure strata is middle Ordovician limestone. The overlying strata are the Lower Shihezi formation, the Upper Shihezi formation, the Shiqianfeng formation, the Liujiagou formation and other non-coal-bearing strata. Chuancao Gedan coal mine is located in the southeast of Zhunger coalfield, in the north adjacent to Haliwusu opencast coal mine, and in the south of Hedong coalfield. The main coal seam is coal seam No. 4, No. 5 of Shanxi formation and seam No. 6 and No. 9 of Taiyuan formation. The thickness of coal seam is large and the interval between layers is small. The geological and hydrological conditions are simple and siltstone is the main roof and bottom plate. Taking Chuancao Gedan 5 coal in Zhunger coalfield as the research object, coal petrology, mineralogy and coal geochemistry are used to analyze and study the coal and rock coal quality characteristics, mineralogical and geochemical characteristics of No. 5 coal. The following understandings have been obtained: (1) No. 5 coal is mainly semi-bright briquette and semi-dark briquette, followed by bright briquette, rare dim briquette, high semi-vitrinite content, high ash content, medium volatile content, low moisture content, low sulfur content, (2) kaolinite, magnetite, quartz, calcite, pyrite, gypsum and other minerals are developed in No. 5 coal, among which kaolinite is extremely developed with an average content of 97.92% of the total mineral amount, and magnetite is the second. The other minerals were only detected in individual samples. (3) the content of the constant element (42.42%) in No. 5 coal was much higher than that of the other elements, followed by Fe2O3 and TIO _ 2 (average 1.991.67%). (4) the content of Fe2O3 and TIO _ 2 (the average content was 1.991.67%) was relatively low. (4) the content of Fe2O3 and TIO _ 2 was relatively low in coal. (4) the content of Fe2O3 and TIO _ 2 was higher than that of other elements. (4) the content of Fe2O3 and TIO _ 2 (the average content was 1.991.67%) was lower than that of other elements. (4) the content of Fe2O3 and TIO _ 2 was relatively low in coal. The average content is higher and the content of as is lower. The content of other trace elements, such as Li-NiNiSe, ZrZrNb-CD and so on, is higher in coal, but the content of Cr-Sr is lower. (5) the correlation between harmful elements in coal and the composition of coal is studied. In combination with the correlation analysis of R-type clustering and elemental symbiosis assemblage, the main organic binding forms of Bea Asau in coal are inorganic bound Hg and sulfide-bound Hg in coal. (6) geochemical indexes such as w (Sr) / w (Ba) / w (V) / w (Ni) / w (V Ni) / w (Sr) / w (Cu), 鈭，
本文编号：2160554
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