贵州织金县以那矿区龙潭组煤中元素的地球化学特征

Geochemical Characteristics of Elements in Coal of Longtan Formation in Yina Mining Area,Zhijin County,Guizhou Province

研究煤中元素的地球化学特征,对于还原聚煤环境以及探究元素对生态的影响具有重要意义。以贵州织金县以那矿区龙潭组多煤层为研究对象,综合利用数理统计方法、灰成分分析法和富集系数法研究了不同层段煤中常量元素、微量元素的地球化学特征。结果表明,各煤层总体为中灰分、特低挥发分、中高~高硫煤;各煤层硫以黄铁矿硫为主,黄铁矿硫与全硫显著正相关,黄铁矿呈聚集团块状和分散颗粒状分布,表明煤层中硫的富集可能受泥炭堆积时期海水的影响;大部分煤层灰成分指数大于0.22,27号煤层小于0.22,说明该矿区大多数煤层形成于海相环境,仅个别煤层为陆相沼泽成因;可采煤层中As的富集系数达6.02,属高砷煤,6、7、10号煤层F含量明显高于中国煤和世界煤中均值,属高氟煤,建议在煤炭开发利用过程中重视As、F等有害元素的治理和生态环境的保护。

The study on the geochemical characteristics of elements in coal is of great significance for reducing coal accumulation environment and explore the ecological impact of elements,taking the multi-coal seam of Longtan formation in Yina mining area in Zhijin County,Guizhou Province as the research object,the geochemical characteristics of major and trace elements in different coal seams were studied by means of mathematical statistics,ash component analysis and enrichment coefficient method.The results show that the coal seams are generally medium ash,ultra-low volatile and medium-high sulfur coal.The sulfur in each coal seam is mainly pyrite sulfur,and there is a significant positive correlation between pyrite sulfur and total sulfur.Pyrite is clustered and dispersed in granular distribution,indicating that the enrichment of sulfur in coal seams may be affected by sea water during the period of peat accumulation.The ash composition index of most coal seams is more than 0.22 and the coal seam No.27 is less than 0.22,indicating that most of the coal seams in this mining area are formed in the marine environment,and only a few coal seams are of continental swamp origin.The enrichment coefficient of As in the coal seams reaches 6.02,which belongs to high arsenic coal.The F content is higher than the average value of Chinese coals and world coals,such as coal seams 6,7 and 10,all belong to high fluorine coal.It is suggested that attention should be paid to the control of harmful elements such as As and F in the process of coal exploitation and utilization.