魏迎春, 华芳辉, 何文博, 宁树正, 张宁, 秦云虎, 曹代勇. 峰峰矿区2号煤中微量元素富集特征差异性研究[J]. 煤炭学报, 2020, 45(4). DOI: 10.13225/j.cnki.jccs.2019.0995
引用本文: 魏迎春, 华芳辉, 何文博, 宁树正, 张宁, 秦云虎, 曹代勇. 峰峰矿区2号煤中微量元素富集特征差异性研究[J]. 煤炭学报, 2020, 45(4). DOI: 10.13225/j.cnki.jccs.2019.0995
WEI Yingchun, HUA Fanghui, HE Wenbo, NING Shuzheng, ZHANG Ning, QIN Yunhu, CAO Daiyong. Difference of trace elements characteristics of No. 2 coal in Fengfeng mining area[J]. Journal of China Coal Society, 2020, 45(4). DOI: 10.13225/j.cnki.jccs.2019.0995
Citation: WEI Yingchun, HUA Fanghui, HE Wenbo, NING Shuzheng, ZHANG Ning, QIN Yunhu, CAO Daiyong. Difference of trace elements characteristics of No. 2 coal in Fengfeng mining area[J]. Journal of China Coal Society, 2020, 45(4). DOI: 10.13225/j.cnki.jccs.2019.0995

峰峰矿区2号煤中微量元素富集特征差异性研究

Difference of trace elements characteristics of No. 2 coal in Fengfeng mining area

  • 摘要: 为探讨煤中锂元素及稀土元素赋存状态和同一煤层不同矿井间煤中微量元素的差异性及其控制因素。以峰峰矿区的梧桐庄矿和九龙矿山西组2号煤为研究对象,通过反射光显微镜、原子吸收光谱仪(AAS)及X射线荧光光谱仪(XRF)、电感耦合等离子体质谱仪(ICP-MS)、带能谱的扫描电镜(SEM-EDS)等分析测试方法,对比分析了两煤矿2号煤中煤质及微量元素富集特征,研究了2号煤中Li及稀土元素(REY)的赋存状态,探讨了2号煤微量元素富集特征的差异性及其影响因素。研究结果表明,九龙矿2号煤层样品中微量元素含量整体比梧桐庄矿高,梧桐庄矿和九龙矿2号煤中Li元素平均含量分别为49.8μg/g和64.3μg/g,稀土元素平均含量分别为68.8μg/g和130μg/g。梧桐庄矿2号煤中Li元素和REY元素主要赋存于煤的有机质中;而九龙矿2号煤中Li元素主要赋存于高岭石和伊利石等黏土矿物中,REY元素主要赋存于独居石、黄铁矿和黏土矿物中。峰峰矿区2煤的沉积物源和沉积环境控制了其微量元素分布的总体特征,而燕山期岩浆热液作用导致2号煤层中微量元素在矿区南部的梧桐庄矿和矿区中部的九龙矿的差异。岩浆热液作用主要引起煤中Li,Nb,Pb,Ta,Th,Y,La,Sm,Ce,Er,Yb元素富集,其余微量元素没有明显变化。尤其是稀土元素和Li元素受岩浆热液影响含量增加,峰峰矿区九龙矿比梧桐庄矿2号煤中Li元素平均含量高14.5μg/g,稀土元素平均含量高61.2μg/g。梧桐庄矿2号煤中只有Li元素表现为轻微富集,而九龙矿2号煤中Li元素表现为富集,Nb,Pb,Ta,Th元素和稀土元素中Y,La,Er表现为轻微富集。

     

    Abstract: To explore the occurrence of lithium( Li) and rare earth elements( REY) in coal and the differences and control factors of trace elements in coal between different mines in the same coal seam,No. 2 coal seam of Shanxi Formation in the Wutongzhuang coal mine and the Jiulong coal mine of Fengfeng mining area was studied. The coal maceral,the coal quality and trace elements characteristics of No. 2 coal seam in two coal mines were compared and ana- lyzed by the reflected light microscopy,the atomic absorption spectroscopy (AAS),the X-Ray fluorescence spectrome- ter (XRF),the inductively coupled plasma mass spectrometer (ICP-MS),and the scanning electron microscope with energy spectrum (SEM-EDX). The occurrence of Li and REY in No. 2 coal seam was studied. The difference of the trace elements in No. 2 coal seam and its influencing factors were discussed. The results show that the content of trace elements in No. 2 coal seam of the Jiulong coal mine in the middle of the Fengfeng mining area is higher than that of the Wutongzhuang coal mine in the south of the Fengfeng mining area. The average content of Li in No. 2 coal seam of the Wutongzhuang coal mine and the Jiulong coal mine is 49. 8 μg / g and 64. 3 μg / g respectively,and the average content of REY is 68. 8 μg / g and 130 μg / g,respectively. The Li and REY in No. 2 coal seam of the Wutongzhuang coal mine mainly occur in the organic matter of coal. While the Li in No. 2 coal seam of the Jiulong coal mine mainly exists in clay minerals such as kaolinite and illite,and the REY mainly occur in monazite,pyrite and clay minerals. The sediments source and the sedimentary environment of No. 2 coal seam controlled the overall characteristics of its trace elements distribution in the Fengfeng mining area,and the magmatic hydrothermal action in Yanshan Period re- sulted in the difference of trace elements in No. 2 coal seam between the Wutongzhuang coal mine and the Jiulong coal mine. The magmatic hydrothermal action mainly causes the enrichment of Li,Nb,Pb,Ta,Th,Y,La,Sm,Ce,Er,Yb in coal,and the remaining trace elements do not clearly vary. In particular,the contents of REY and Li elements increase due to the influence of magma. The average Li content in the coal of Jiulong coal mine is 14. 5 g / g higher than that of the Wutongzhuang coal mine, and the No. 2 coal seam of the Jiulong coal mine has an average REY content of 61. 2 μg / g higher than that of the Wutongzhuang coal mine. Only the Li in No. 2 coal seam of the Wutongzhuang coal mine appears to be slightly enriched,while the Li in No. 2 coal seam of the Jiulong coal mine appears to be enriched, and Nb,Pb,Ta,Th,Y,La,and Er appear a slight enrichment.

     

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