马家塔矿煤层中有害痕量元素的质量分数特性

Concentration of harmful trace elements in No.2-2 coal seam of Majiata strip mine

应用仪器中子活化(INAA)、电感耦合等离子体原子发射光谱(ICP-AES)和原子吸收光谱(AAS)对神华集团马家塔露天矿2-2#煤层中Hg、As、Se、Pb、Be、Cr、Cd、N i、Th、U、Mn、Mo、Co、Sb和B r共15种有害痕量元素的质量分数进行测定。结果表明,绝大部分痕量元素的质量分数都明显低于中国煤中元素质量分数的平均值,只有Hg和Mn的质量分数偏高,其中Hg的质量分数异常高;通过分析痕量元素在煤层垂向剖面上的质量分数变化特性,揭示出痕量元素在煤层中分布的非均一性,分析了影响痕量元素分布与富集的因素;通过痕量元素之间以及与黄铁矿硫、Fe、A l、Ca、P的聚类分析,研究了痕量元素之间以及与煤中不同矿物组分之间的亲和特性。

Concentration, distribution and modes of occurrence of 15 harmful trace elements including As, Pb, Hg, Se, Cd, Cr, Co, Mo, Mn, Ni, U, Th, Be, Sb, and Br in No. 2-2 coal seam, Majiata strip mine were studied. Compared with the average concentrations of trace elements in Chinese coals, the coal in No. 2-2 coal seam of the Majiata strip mine contains higher concentration of Hg and Mn. They may be harmful to the environment in the process of combustion and in other utilization. The distribution characteristics of the trace elements and pyrite sulfur in vertical section indicate that the distributions of the most trace elements in the coal seam are heterogeneous. The concentrations of As, Pb, Cr, Ni, Co, U, Mo, Be and Sb are higher in top or bottom and lower in coal seam, whereas the concentration of Br is higher in coal seam and lower in top and bottom. Cluster analysis of trace elements, pyrite sulfur, and major elements, such as A1, Fe, Ca shows that pyrite sulfur, As and Pb are closely associated and reflect the influence of pyrite. U, Cr, Th, Mo, Be, Sb, and Mn are related to clay mineral, which is the main source of ash. Br and Hg may be controlled by organic matter.