新义井田2号煤中若干微量元素地球化学特征

Geochemical characteristics of some trace elements in No.2 coal seam of Xinyi Mining Field

为查明新义井田2号煤中微量元素的地球化学特征,运用X射线衍射法(XRD)、电感耦合等离子体质谱(ICP-MS)方法对2号煤中显微组分、灰分、硫分、微量元素、常量元素进行测试分析。利用数理统计方法对煤中微量元素与上述煤质特征参数进行相关性分析,探讨2号煤中微量元素的富集特征、赋存特征。研究表明,2号煤中Ge、As的富集系数大于1,但未呈现明显的富集状态; Ga、U、F、Cl的富集系数小于1,其中Cl的含量远低于地壳丰度,呈现相对亏损状态;相关性分析显示Ga、As为亲有机元素,P为无机—有机元素,U、F、Cl、Ge为亲无机元素;煤中微量元素的赋存状态具有多样性,主要以有机结合态、铝硅酸盐结合态、碳酸盐结合态、羟磷灰石结合态和硫酸盐、硫化物形式为主。

In order to ascertain the geochemistry of trace elements in the No.2 coal seam of Xinyi Mining Field,XRD,ICP-MS and chemical analysis were applied to investigate coal geochemistry characteristics,such as sulfur content,ash yield,and trace elements concentration of Ge,Ga,U,F,As,Cl,P.It showed accurate content of trace elements,and the organic affinity,occurrence of trace elements were analyzed based on statistics.Results showed that the contents of trace elements as Ga,F,Cl exceed that in China coal,and the enrichment factors of Ge,As exceed 1,but the enrichment state was not obvious;the enrichment coefficient of Ga,U,F and Cl is less than 1,and the content of Cl is much lower than that of crustal abundance,showing a relatively deficit state.Correlation analysis showed that organic elements content Ga,As,and inorganic-organic affinity element content P,and U,F,Cl,Ge have no organic affinity.The occurrences of these trace elements in coal included Hydroxyapatite,Aluminosilicate organic combination,carbonate and inorganic compounds forms.