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首页> 外文期刊>Journal of Geochemical Exploration: Journal of the Association of Exploration Geochemists >Enrichment and distribution of trace elements in Padhrar, Thar and Kotli coals from Pakistan: Comparison to coals from China with an emphasis on the elements distribution
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Enrichment and distribution of trace elements in Padhrar, Thar and Kotli coals from Pakistan: Comparison to coals from China with an emphasis on the elements distribution

机译：巴基斯坦Padhrar，Thar和Kotli煤中的痕量元素的富集和分布：与中国煤炭的比较，重点是元素分布

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This paper reports the mineralogical and geochemical compositions of the Padhrar (salt-range), Thar (Block Nos. 3 and 5) and Kotli coals. The coal investigated in this study is lignite to sub-bituminous coal, with a broad range of ash yields, volatile matter content and sulfur contents. The mineralogical characteristic, major and trace elements were determined by X-ray diffraction, inductively coupled plasma-atomic emission spectrometry and inductively coupled plasma-mass spectrometry, respectively. The mineral assemblages, sulfur contents, ash yields, and (CaO + MgO + Fe2O3)/(SiO2+ Al2O3) ratio varied significantly in the coal, which is attributed mainly to variation in the depositional environment. Pyritic sulfur is the main form of sulfur in the coals from Padhrar, Kotli and Thar coalfield. The minerals in the studied coals are dominated by quartz, pyrite, kaolinite, illite, along with calcite, feldspar, siderite, montmorillonite and gypsum. Sixteen trace elements, including Li, Be, B, Ti, Sc, V, Cr, Mn, Co, Ni, Cu, Zn, As, Rb, Sr, and Ba and five major elements P, Ca, Al, Fe, and Si, were investigated in this study. The trace element concentrations show variety within the coal seams in the Thar coals and the affinities vary among locations. The concentration of Sr, Ti, Zn, Li, Ni, Cu, Sc, As, Be, and B in the present study are within the range of average Chinese coal values, with the exception of V, Cr, Fe, P, and Rb. On the other hand, compared with world coals, the studied coals have higher contents of B, Cr, Li, Fe, V, Rb, P, and Sc. Based on statistical analyses, most of the trace elements, show an affinity to ash yield and possible association with pyrite, kaolinite, and calcite.
机译：本文报道了PADHRAR（盐范围），THAR（嵌段号3和5）和Kotli煤的矿物学和地球化学组成。本研究研究的煤是褐煤对亚沥青煤，具有广泛的灰分产率，挥发物质含量和硫含量。通过X射线衍射，电感耦合等离子体原子发射光谱和电感耦合等离子体质谱法测定矿物学特性，主要和微量元素。煤矿矿物组合，硫含量，灰分，和（CaO + MgO + Fe 2 O 3）/（SiO 2 + Al2O3）的比例在煤中显着变化，主要归因于沉积环境的变异。 Pyritic Sulfur是Padhrar，Kotli和Thar煤田煤中硫的主要形式。学习煤中的矿物质主要由石英，黄铁矿，高岭石，伊尔铁矿以及方解石，长石，泥土，蒙脱石和石膏。十六个微量元素，包括Li，B，B，Ti，Sc，V，Cr，Mn，Co，Ni，Cu，Zn，As，Rb，Sr和Ba和五个主要元素P，Ca，Al，Fe，和在这项研究中调查了Si。痕量元素浓度在煤层中的煤层内显示出各种各样的煤层，亲和力在地点之间变化。本研究中Sr，Ti，Zn，Li，Ni，Cu，Sc，Ni，Cu，Sc的浓度在普通中国煤的范围内，除V，Cr，Fe，p和rb。另一方面，与世界煤相比，研究的煤具有较高的B，Cr，Li，Fe，V，Rb，P和Sc。基于统计分析，大多数微量元素，表现出对灰分，高岭石和方解石的灰分产量和可能的关联。

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