Genesis of natural cokes: Some Indian examples
Genesis of natural cokes: Some Indian examples
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DOI：
10.1016/j.coal.2008.01.002
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发表时间：
2008-06
影响因子：
5.6
通讯作者：
A. K. Singh;M. Sharma;M. Singh
中科院分区：
文献类型：
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作者：
A. K. Singh;M. Sharma;M. Singh
在印度煤田，由于岩浆侵入，生产了大量的天然焦炭。仅印度东部的Jharia煤田就含有约2000 Mt的烘烤炼焦煤，这是由于这些侵入体以不整合和整合体的形式存在。本文研究了嘉里煤田埃纳（第十三层）和阿尔库萨（第十四层）两个受侵入影响煤层的碳化作用。天然焦是炼焦煤在强烈的岩浆热和上覆压力作用下就地生成的。天然焦具有挥发分低、灰分高、有机组分各向同性和各向异性的特点。通过各种方法测定天然焦或“Jhama”的物理、岩相和化学性质，已经确定未蚀变煤中的反应物（镜质组、脂质组、假镜质组、反应性半丝质组等）<25.0体积%，水分<2.5%，挥发分<15.0%，氢气<4.0%。煤层中达到的温度已经使用一些标准模型进行了破译，这表明达到了约1000 °C的温度。这产生了大量的各向异性和沉积碳。试图了解影响印度煤田煤中天然焦和热蚀变显微组分产物成因的因素。
In Indian coalfields huge amounts of natural coke have been produced due to magmatic intrusions. Jharia Coalfield in eastern part of India alone contains approximately 2000 Mt of baked coking coal as a consequence of these intrusions in the form of discordant and concordant bodies. This paper is an effort to investigate the effect of carbonization in two intrusion affected coal seams of Ena (seam XIII) and Alkusa (seam XIV) collieries of Jharia Coalfield. Natural coke is derived from coking coal under in-situ conditions due to intense magmatic induced heat and overburden pressure. Natural coke is characterized by the presence of low volatile matter and high ash contents and organic constituents showing isotropy and anisotropy. Through physical, petrographic and chemical properties of natural coke or ‘jhama’ as determined by various methods it has been established that the reactives in the unaltered coals (vitrinite, liptinite, pseudovitrinite, reactive semifusinite, etc.) are <25.0 vol.%, moisture <2.5%, volatile matter <15.0% and hydrogen <4.0%. The temperatures attained in the coal seams have been deciphered using some standard models, which indicate that a temperature ~1000 °C was attained. This produced huge amount of anisotropic and deposited carbons. An attempt has been made to understand the factors that influence the genesis of natural coke and heat altered maceral products in coals in Indian coalfields.