马家塔矿煤层中有害痕量元素的质量分数特性

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 Al, 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.