吉南地区不同沉积环境原煤微量元素地球化学特征

Microelements geochemical characteristics of coals in different sedimentary environments of southern Jilin Province

对吉林南部地区煤矿主采煤层中的As、B、Ba、Cd、Cu、Hg、Pb、Se、Sr等微量元素的分析结果表明 ,太原组与山西组由于成煤环境不同 ,微量元素组成及含量存在一定的差异 :太原组原煤中As、B、Hg、Pb、Se、Zn的含量明显高于山西组 ,山西组原煤中Ba、Cr、Cu、Mn、V的含量明显高于太原组。吉南煤区原煤中As、B、Hg、Pb、Se明显高于地壳元素平均值 ,呈富集状态 ,Co、Cd与地壳平均值接近 ,其他元素均亏损。与全国煤中微量元素相比 ,该区原煤中As、Ba、Co、Cr、Cu、Hg、Ni、Pb、Se、V、Zn的含量高于全国平均值 ,B、Mn、Sr含量低于全国平均值。微量元素赋存状态及相关分析表明 ,Fe与亲硫有害元素As、Cu、Hg、Pb、Se具有显著相关关系 。

Concentrations of As, B, Ba, Cd, Cu, Hg, Pb, Se, Sr and other microelements were determined for channel samples collected from main active mines in southern Jilin Province. Microelements in coals of Taiyuan Formation are different from those of Shanxi Formation, which is attributed to different coal-forming environments. As, B, Hg, Pb, Se and Zn concentrations in Taiyuan Formation are obviously higher than those in Shanxi Formation, while the concentrations of Ba, Cr, Cu, Mn and V are lower in Taiyuan Formation. Analy-(tical) results show that As, B, Hg, Pb and Se concentrations of coals in southern Jilin Province are markedly higher than their average values of the earth crust, Co and Cd concentrations of coals are close to their earth crust average values, and other microelements are rare. Compared with their average values in other areas, the concentrations of As, Ba, Co, Cr, Cu, Hg, Ni, Pb, Se, V and Zn are higher in southern Jilin Province, and B, Mn and Sr concentrations are lower. The analyses and modes of occurrence of microelements show that such harmful elements as As, Cu, Hg, Pb and Se are correlated with Fe, suggesting that pyrite and sulfide in coals are carriers of many harmful microelements.