东林矿煤中砷的含量分布及赋存状态

Distribution and occurrence mode of arsenic in coal of Donglin mine

燃煤引起人砷中毒在我国云贵川地区比较常见,因此有必要研究煤中砷的赋存状态.研究了重庆东林矿4号和6号主采煤层中砷的含量、分布规律及其赋存特征.研究表明：东林矿4号层煤中砷、总硫和灰分的平均含量均大于6号层.东林矿原煤中砷的含量范围为0.20-7.87 μg/g,平均值1.68 μg/g,明显低于重庆及重庆其他矿煤中砷的平均水平,没有明显富集.赋存特征分析表明,东林矿煤中砷具有明显的亲硫性,可能主要赋存于同生黄铁矿中,在硅酸盐矿物相中分布较少.

It is more common in arsenic poisoning by coal burning in Yunnan, Guizhou and Sichuang. It is necessary to study occurrence modes of arsenic in coal content, distribution and mode of occurrence of arsenic have been studied in samples collected at No.4 and No.6 coal seams in Donglin Mine, Chongqin. The results shows that the average content of As, S and ash of No.4 coal seam is higher than that of No.6 seam. In addition, the average As concentration in Donglin raw coal is 1.68μg/g and varies from 0.20μg/g to 7.87μg/g, obviously lower than that of coal in Chongqing and other coalfields. There is not any sign of As enrichment in Donglin mine. Statistical results show that As in coal is obviously thiophilic and exist mainly in syngenetic pyrite, less in silicate mineral phase.