重庆东林矿煤中有害元素砷、汞的研究

发布时间：2018-02-24 13:23

本文关键词： 微量元素砷汞含量赋存状态东林矿　出处：《安徽理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：为研究重庆东林矿4#和6#主采煤层煤中砷、汞的含量水平和赋存状态,给东林矿煤炭资源合理利用提供科学依据,共收集29个煤和岩石样品(煤样25个,岩石样品4个),分别对该矿煤中砷、汞含量的一般特征、质量分数水平、富集情况和赋存状态进行了研究,并结合研究区含煤地层的沉积环境,探讨了煤中砷、汞的主要来源。运用电感耦合等离子质谱仪(ICP-MS)和汞分析仪(AMA254)分别测定了煤样中砷和汞的含量,结果表明：东林矿煤中砷含量的变化范围0.19-7.87μg/g,平均1.85pg/g；汞含量的变化范围0.11-3.3μg/g,平均0.54μg/g。与世界煤中砷、汞的背景值(丰度)相比,东林矿煤中砷为低质量分数水平,而汞为正常质量分数水平。相对地壳的富集系数可以看出：砷和汞均为富集状态。与长河碥矿、松藻、西南三省一市(贵州、四川、云南和重庆)、中国煤、美国煤、澳大利亚煤和世界煤相比,东林矿煤中砷的含量偏低,而汞的含量高于其他地区煤(除松藻、重庆和四川外)。另外,就不同煤层而言,东林矿4#煤中砷的含量(1.88μg/g)略高于6#煤中砷的含量(1.79μg/g)；4#煤中汞的含量(0.64μg/g)高于6#煤中汞的含量(0.32μg/g)。砷和汞在4#煤层的顶板、煤层中上部、中部、中下部有所富集,其中砷在煤层中上部含量最高,而汞在中下部含量最高；砷和汞在6#层的顶、底板、煤层中下部富集。通过煤中砷、汞含量与灰分、全硫、形态硫及灰分产率之间的相关分析、因子分析和聚类分析,结合其地球化学性质和前人研究成果,基于含煤地层沉积环境和煤中同生黄铁矿的成因,探讨了东林矿煤中砷、汞的赋存状态,结果表明：东林矿煤中砷和汞最可能赋存在硫酸盐矿物和同生黄铁矿中。
[Abstract]:In order to study the level and state of arsenic and mercury in coal seam of Donglin Mine, Chongqing, 29 samples of coal and rock (25 samples of coal) were collected, in order to provide scientific basis for rational utilization of coal resources in Donglin Coal Mine. The general characteristics, mass fraction, enrichment and occurrence of arsenic and mercury in coal were studied in four rock samples. The main sources of arsenic and mercury in coal were discussed in combination with the sedimentary environment of coal-bearing strata in the study area. Inductively coupled plasma mass spectrometer (ICP-MS) and mercury analyzer (AMA254) were used to determine the arsenic and mercury content in coal samples. The results showed that the variation range of arsenic content in Donglin coal was 0.19-7.87 渭 g / g, with an average of 1.85 PG / g; the variation range of mercury content was 0.11-3.3 渭 g / g, with an average of 0.54 渭 g / g. Compared with the background value (abundance) of mercury, arsenic in Donglin mine coal is low mass fraction level and mercury is normal mass fraction level. The relative crustal enrichment coefficient shows that arsenic and mercury are both enriched state. Three provinces and one city in southwest China (Guizhou, Sichuan, Yunnan and Chongqing), Chinese coal, American coal, Australian coal and world coal have lower arsenic content and higher mercury content than other coal (except pine algae). In addition, the arsenic content of coal in Donglin Coal Mine is 1.88 渭 g / g) slightly higher than that in No. 6 # coal (1.79 渭 g 路g / g), which is 0.64 渭 g / g / g higher than that in No. 6 # coal, and 0.32 渭 g / g / g. Arsenic and mercury are in the roof of the coal seam, in the upper and middle of coal seam, in the middle, in the middle, in the middle, in the middle, in the top of the coal seam, in the top of the coal seam, in the top of the coal seam, in the middle of the coal seam, and in the middle of the coal seam. The content of arsenic and mercury is the highest in the upper part of coal seam and the highest in the middle and lower part of coal bed, and the concentration of arsenic and mercury is in the top, bottom plate and middle and lower part of coal seam. Based on the correlation analysis, factor analysis and cluster analysis between arsenic, mercury and ash, total sulfur, speciation sulfur and ash yield in coal, the geochemical properties and previous research results were analyzed. Based on the sedimentary environment of coal bearing strata and the genesis of syngenic pyrite in coal, the occurrence state of arsenic and mercury in Donglin coal is discussed. The results show that arsenic and mercury in Donglin coal are most likely to occur in sulfate minerals and syngenic pyrite.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.11

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