东林矿煤中砷的含量分布及赋存状态
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摘要
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0.20~7.87μg/g,平均值1.68μg/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.
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.
引文
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[2]唐修义,黄文辉.中国煤中微量元素[M].北京:商务印书馆,2004:54–75.
[3]代世峰,周义平,任德贻,等.重庆松藻矿区晚二叠世煤的地球化学和矿物学特征及其成因[J].中国科学D辑:地球科学,2007,37(3):353–361.
[4]DAI Shifeng,WANG Xibo,CHEN Wenmei,et al.A high-pyrite semianthracite of Late Permian age in the Songzao Coalfield,southwestern China:Mineralogical and geochemical relations with underlying mafic tuffs[J].International Journal of Coal Geology,2010,83:430–445.
[5]王西勃,李丹,逯雁峰,等.重庆长河碥矿煤的微量元素地球化学特征[J].煤田地质与勘探,2007,35(3):4–9.
[6]李大华,唐跃刚,陈坤,等.中国西南地区煤中12种有害微量元素的分布[J].中国矿业大学学报,2006,35(1):15–20.
[7]肖达先.煤中砷及其赋存形态的研究[C]//煤炭科学院研究总院西安分院文集.陕西:陕西科学出版社,1989:36–48.
[8]KANG Yu,LIU Guijian,CHOU C L,et al.Arsenic in Chinese coals:distribution,modes of occurrence,and environmental effects[J].Science of the Total Environment,2011,412/413:1–13.
[9]陈萍,黄文辉,唐修义.我国煤中砷的含量赋存特征及对环境的影响[J].煤田地质与勘探,2002,30(6):1–4.
[10]黎彤.地壳元素丰度的若干统计特征[J].地质与勘探,1992,28(10):1–7.
[11]谢宏,聂爱国.黔西南高砷煤的元素地球化学特征[J].贵州地质,2006,23(2):109–113.
[12]张建平,王运泉,张汝国,等.煤及其燃烧产物中砷的分布特征[J].环境科学研究,1999,12(1):27–34.
[13]徐文东,曾荣树.燃煤电厂废弃物中的砷对周围环境的影响[J].矿物岩石,2003,23(4):110–114.