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The Late Triassic (Carnian-Rhaetian) Callide Coal Measures are preserved in a partly fault-bounded basin remnant in east-central Queensland, Australia. The sequence comprises up to 150 m of interbedded clastic sedimentary rocks and at least four major coal seams, including one coal body up to 23 m thick. The sequence was deposited initially in high-gradient alluvial fan systems which gave way through time to sandy, low-sinuosity rivers. The restricted, intermontane and entirely alluvial nature of sediment accumulation is here considered to have influence the petrographic characteristics of Callide coals, and their external geometry.The main coal seam from the Callide Measures shows variation in the predominance of some macerals, indicating successions of environmental changes. The application of transmission electron microscopy (TEM) to the study of the Callide coal has enabled a better understanding of the nature and origin of some of the less understood macerals such as micrinite and vitrinite B. Two forms of vitrinite have been observed, each with a distinct reflectance range. The wood-sourced vitrinite A displays an average reflectance of 0.56%, implying a higher rank than the 0.49% Ro total vitrinite reflectance recorded in previous publications. Vitrinite B and A together represent the most commonly occurring macerals in the Callide coal samples of the present study. The lower-reflecting vitrinite B which forms bands, often several hundred μm in thickness, in TEM shows sub-micron electron transparent laminae of lipid-rich material alternating with a more conventional vitrinite material. The vitrinite B is interpreted to represent accumulations of leaves.The Callide coal has entered the oil window, and oil has been generated from some exinite, cutinite, and resinite, as evident from change in fluorescence and the presence of exsudatinite in cell cavities and cleats. Vitrinite B is seen under the microscope to also be generating oil. Micrinite, the origin of which has been much debated, occurs in selected horizons only, as lenticular bodies suggesting cell filling or filling of spaces between laminations in vitrinite B. TEM shows micrinite to consist predominantly of sub-micron pyrite and possibly other mineral particles adsorbed on humic acids. 相似文献
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介绍了古交矿区8号煤在不加催化剂和加催化剂两种条件下的实验室热解脱硫试验情况．结果表明，在不加催化剂时，升温速度为5～10℃／min脱硫效果最好，脱硫率大于40％；当在原煤中添加催化剂AlCl3和NH4Cl时，有较好的脱硫作用，焦炭中灰分也没有明显提高，而当添加催化剂CuCl2和CaO时，不能脱除煤中硫。并据此提出了建议脱硫方案。 相似文献
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R.A. Kühnel 《International Journal of Mineral Processing》1983,11(1):75-76
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为了探讨煤中微量元素的赋存状态和地质成因,本文运用电离耦合等离子体质谱(ICP-MS)、电离耦合等离子体原子发射光谱(ICP-AES)、X射线荧光光谱(XRF)、冷原子吸收光谱(CV-AAS)、离子选择性电极法(ISE)、逐级化学提取试验(SCEE)等,研究了重庆长河碥矿晚三叠世须家河组2号煤层中微量元素的含量、赋存特征及其影响因素.发现该煤层中As(12.9 μg/g)、Cu(125 μg/g)、Cr(72 μg/g)、Ni(63 μg/g)、Pb(111 μg/g)等元素富集;逐级化学提取结果显示,煤层中Pb主要赋存在低温热液成因的黄铁矿脉中;Cr主要存在于粘土矿物中,Cr可能与陆源碎屑供给有关;Cu不仅与粘土矿物有关,也与煤中黄铁矿有关.表明低温热液流体和陆源碎屑供给对该煤中主要微量有害元素的含量和赋存特征起了决定作用. 相似文献
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采用光学显微镜、X射线荧光光谱（XFS）和电感耦合等离子体质谱（ICP-MS）等方法测定了大同煤田塔山井田太原组5号煤的宏观煤岩类型、显微煤岩类型和地球化学参数,探讨了煤的煤岩学、煤地球化学及煤相特征,系统地分析了煤层的原始成煤泥炭沼泽环境及演化规律。研究结果表明,5号煤层有4种煤相类型,即湖沼相、泥炭沼泽相、潮湿森林沼泽相和较干燥森林沼泽相,相应表现为湖泊、障壁岛后潟湖、上三角洲平原和洪泛盆地含煤沉积体系特征。煤层自下而上存在5次比较明显的沉积旋回韵律,与之相随的水介质环境也发生了相应的海陆、咸水、淡水交替变化,从而形成了一套以陆相为主、海陆交互的成煤泥炭沼泽环境,沉积环境逐渐从海相、海陆过渡相向陆相演化。 相似文献
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马依西二井田位于贵州省盘县煤田盘南矿区南部,含煤地层为二叠系上统龙潭组,17^-1号煤层厚0.70～9.36m,全区可采,宏观煤岩类型为半亮—半暗煤,显微煤岩类型为微镜惰煤。煤质特征表明该煤层为中灰分、特低挥发份、中高固定碳、中高硫、特低磷、中热值的三号无烟煤,可作动力煤和燃料煤使用。 相似文献
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乌兰诺尔井田位于内蒙古自治区东北部,含煤地层主要为白垩系下统巴彦花组,6号煤是区内唯一可采煤层,其显微组分镜质组含量为85.2%～91.0%,惰质组含量为2.0%～13.4%,壳质组在2%以下。测试分析表明6号煤属中灰、低—中高硫、高热值褐煤,其挥发分高,化学反应性好,燃烧时速度快,反应充分,是很好的动力燃料,适用于火力发电。 相似文献
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煤灰化过程中有益元素镓的迁移和变化特征——以内蒙古准格尔富镓煤为例 总被引：2，自引：1，他引：1
通过内蒙古准格尔黑岱沟矿富镓（Ga）煤样在不同温度段的灰化试验,测定了煤在不同温度下的烧失量,研究了Ga在灰化过程中含量的变化及其迁移转化规律。结果表明,灰化过程中供氧不足时,镓可能转化为易挥发的低价化合物而挥发;灰化温度在300～500℃间时,煤样的烧失量与温度成正相关关系,镓的损失量由高变低;灰化温度高于500℃时,煤样烧失量随温度升高增长缓慢,镓的损失量逐渐增大。 相似文献
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Sarah M. Mardon James C. Hower Jennifer M.K. O'Keefe Maria N. Marks Daniel H. Hedges 《International Journal of Coal Geology》2008,75(4):248-254
Fly ashes from two stoker boilers burning Pennsylvanian Eastern Kentucky high volatile A bituminous coal blends were examined for their petrology and chemistry. The source coals have similar trace element contents. One of the ash collection systems was retrofitted with a baghouse (fabric filter) system, collecting a finer fly ash at a cooler flue gas temperature than the plant that has not been reconfigured. The baghouse ash has a markedly higher trace element content than the coarser fly ash from the other plant. The enhanced trace element content is most notable in the As concentration, reaching nearly 9000 ppm (ash basis) for one of the collection units. Differences in the ash chemistry are not due to any substantial differences in the coal source, even though the coal sources were from different counties and from different coal beds, but rather to the improved pollution control system in the steam plant with the higher trace element contents. 相似文献