Qiao Junwei, Du Fangpeng, Wang Shuangmei, Tan Furong, Zhang Yonggang
College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China.
Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi'an 710054, China.
ACS Omega. 2020 Aug 6;5(32):20202-20214. doi: 10.1021/acsomega.0c01863. eCollection 2020 Aug 18.
High concentrations of Mn were observed in 5 coal (Jurassic age) from Qinglongsi coal mine in the Northern Ordos Basin. To study the occurrence characteristics and sedimentary environment of the 5 coal (3.9 m), 22 samples were collected from a mining face. The test result indicates that the 5 coal is in low-ash, high-volatile, very low-sulfur, and bituminous rank, with high inertinite content. The minerals in Jurassic 5 coal are composed primarily of kaolinite, siderite, calcite, quartz, pyrite, K-feldspar, and fluorapatite. The Mn element is enriched in the upper part of the 5 coal seam with an average of 1243.01 μg/g, which is about 17.5 times higher than the average of world hard coal. The concentration level of Mn has a positive correlation with that of FeO and carbonate minerals. A weak reduction environment of the coal-accumulating swamp may induce the enrichment of Mn, which is mainly carried by siderite in the 5 coal.
在鄂尔多斯盆地北部青龙寺煤矿的5号煤（侏罗纪）中观测到高浓度的锰。为研究5号煤（厚3.9米）的赋存特征和沉积环境，从一个采煤工作面采集了22个样本。测试结果表明，5号煤为低灰、高挥发、极低硫的烟煤，惰质组含量高。侏罗纪5号煤中的矿物主要由高岭石、菱铁矿、方解石、石英、黄铁矿、钾长石和氟磷灰石组成。锰元素在5号煤层上部富集，平均含量为1243.01μg/g，约为世界硬煤平均含量的17.5倍。锰的浓度水平与FeO和碳酸盐矿物的浓度水平呈正相关。聚煤沼泽的弱还原环境可能导致锰的富集，锰在5号煤中主要由菱铁矿携带。
