Geochemistry of Carboniferous coals from the Laoyaogou mine, Ningwu coalfield, Shanxi Province, northern China: Emphasis on the enrichment of valuable elements
Geochemistry of Carboniferous coals from the Laoyaogou mine, Ningwu coalfield, Shanxi Province, northern China: Emphasis on the enrichment of valuable elements
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DOI：
10.1016/j.fuel.2020.118414
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发表时间：
2020-11
期刊：
影响因子：
7.4
通讯作者：
Bangjun Liu;Junyan Wang;Hongtao He;V. Mishra;Yanheng Li;Jinxi Wang;Cunliang Zhao
中科院分区：
文献类型：
--
作者：
Bangjun Liu;Junyan Wang;Hongtao He;V. Mishra;Yanheng Li;Jinxi Wang;Cunliang Zhao
本文为山西宁武煤田老窑沟矿区煤中有价元素及其成因提供了新的地球化学资料。煤中主要矿物为高岭石、黄铁矿、方解石和薄水铝石，少量矿物为伊利石和锐钛矿。煤中富集Li、Ga、Zr、Zn、Hf、Sr、Nb、Sn、Th、REY等元素，其中Li的平均含量高达163.42 μg，是世界硬煤的10倍以上。锆和铪的平均浓度是世界硬煤的5倍以上。锂、Ga、Zr、Hf和Th具有较强的无机亲和，而Sr和REY具有较强的有机亲和。5号煤中Li的主要载体为高岭石、伊利石和薄水铝石。镓、Zr、Hf、Th可能具有相同的成因，并与产自源区的高岭石和含钛/含钙矿物密切相关。山西主要煤田富集Li、Ga、Zr、Hf、Th等贵重元素，特别是宁武煤田和沁水盆地的Li平均含量较高，分别为116 μg和110 μg。老窑沟煤和山西主要煤田煤作为煤本身及其副产品的潜在宝藏，具有重要的经济意义。
This paper provides new geochemical data focussing on valuable elements and their origins in the coals from the Laoyaogou mine, Ningwu coalfield, Shanxi Province, northern China. Kaolinite, pyrite, calcite, and boehmite are the main minerals, along with a small amount of illite and anatase, present in the coals studied.The studied coals are enriched with Li, Ga, Zr, Zn, Hf, Sr, Nb, Sn, Th, and REY, especially the case of high average concentration of Li (163.42 μg/g) which is more than ten-times higher than that in world hard coals. Zirconium and Hf, the average concentrations of which are more than five-times higher than those in world hard coals. Lithium, Ga, Zr, Hf, and Th have strong inorganic affinities, whereas Sr and REY have organic affinities. The main carrier of Li in the No. 5 Coal is kaolinite, illite, and boehmite. Gallium, Zr, Hf, and Th probably have the same origin and are largely associated with kaolinite and Ti/Ca-bearing minerals which originate from the source region. In Shanxi Province, the main coalfields are enriched in several valuable elements (e.g. Li, Ga, Zr, Hf, and Th), especially the high average content of Li in the Ningwu coalfield (116 μg/g) and the Qinshui Basin (110 μg/g). The Laoyaogou coals and the coals from the main coalfields in Shanxi Province have economic significance as hidden treasures of the coals themselves and in their by-products.