淮南煤田深部A组煤中有害微量元素地球化学特征

以淮南煤田深部A 组煤为研究对象，全层刻槽采集了煤、夹矸和顶底板岩石样品，采用电感耦合等离子质谱仪 （ICP-MS） 测试分析了样品中13 种有害微量元素的含量，对比研究了其分布特征，结合Tessier 五步形态提取法和相关性分 析探讨了煤中有害微量元素的赋存形态。结果表明：（1） 与中国上陆壳中各种微量元素含量均值相比，淮南深部A 组煤中 B，As，Se，Mo，Cd，Pb，Hg 的富集系数均大于1，在A 组煤中表现为富集；A 组煤中B，As，Se，Cd 的含量均高于淮南煤 田上部B 组煤、华北煤以及中国煤中的含量均值；（2） 相关性分析和逐级提取实验结果表明，A 组煤中微量元素主要以残 渣态和铁锰氧化物结合态存在，两者质量分数之和达到55%~98%，其中Ni，Mo，Cd，Hg，Cu，Pb 和Zn 主要赋存于硫化物 矿物中，Mn 主要赋存于碳酸盐矿物中，V，Cr，Se，B 和As 主要赋存于硅铝酸盐等黏土矿物中。（3） B 元素示踪物源及沉 积环境结果显示，淮南煤田深部A 组煤成煤环境为海相咸水沉积环境，稳定的咸水沉积环境以及受海水影响等因素导致A 组煤中微量元素出现不同程度的富集。

Geochemistry of Hazardous Trace Elements in the Deeply-buried Group A Coal Seam from Huainan Coalfield,Anhui, China

Samples of coal, gangue, roof and floor rocks were collected from the deeply-buried group A coal seam from Huainan coalfield, Anhui, China. The concentrations of thirteen hazardous trace elements were determined by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) to investigate the distribution characteristics of hazardous trace elements in the deeply-buried group A coal seam of Huainan coalfield. The occurrence of hazardous trace elements in the deeply-buried group A coals were analyzed by the Tessier five-step morphological extraction method and correlation analysis. The results show that, (1) Compared with the average contents of various trace elements in the Chinese upper continental crust, the calculated enrichment coefficients of B, As, Se and Cd are all greater than 1 in the deeply-buried group A coal seam from Huainan coalfield, indicating relative enrichment; the concentrations of B, As, Se and Cd in the deeply-buried group A coals seam of Huainan coalfield were relatively higher than those in the upper part of the Group B coals of Huainan, Northern China coals and Chinese coals. (2) Correlation analysis and Sequential extraction experiments show that most of the trace elements in the group A coals mainly existed in the residual form and Fe-Mn Oxide binding state, and the sum of quality fractions ranged from 55%~98%. Ni, Mo, Cd, Hg, Cu, Pb and Zn mainly occurred in sulfide minerals, whereas Mn occurred in carbonate minerals. V, Cr, Se, B and As mainly occurred in clay minerals such as aluminosilicate. (3) Deposition environment of the deeply-buried group A coals was traced by boron and the results show that the deeply-buried group A coals was formed a brackish water-influenced sedimentary environment. Concentration of trace elements in the deeply-buried group A coals could be explained by the stable salt water sedimentation environment and the influence of seawater