霍西煤田不同密度煤中常微量元素地球化学特征

Major and trace elements geochemistry of different density coal samples from Huoxi Coalfield

以霍西煤田灵石矿区10号煤不同密度煤样为研究对象,采用原子荧光光谱法(AFS),X射线荧光光谱法(XRF)、电感耦合等离子质谱法(ICP-MS)等方法测定样品的常、微量元素质量分数;运用数理统计方法分析了煤中常微量元素在不同密度煤中的分布规律,并探讨了不同密度煤中微量元素的赋存特征。研究结果表明,霍西煤田10号煤为中-高硫煤,有机硫含量较高。煤中Mo,Cd,Sb,U和As属超富集元素;Li,W,Pb和Bi为富集元素。微量元素Li,Bi,Tl,Sb,As,Mo,Pb,Cd,U,Th和Hf的含量随样品密度的增大均呈现不同程度的递增趋势;Be变化平稳,W表现为先递增后降低的分布特征。元素Mo,U,Sb,Cd和Bi主要以硅酸盐(黏土)矿物吸附态存在;Pb和As与硫化物矿物有关;Si,Ti,Li和Th具有磷酸盐和铝硅酸盐亲和性;Sr和Y偏于碳酸盐亲和性和硅酸盐亲和性;Hf和Zr主要赋存于矿物中;Be和W具有较强的有机亲和性。

Takes the different density coal samples from No.10 coal in Huoxi coal field for investigating the distribution and occurrence of major and trace elements.The atomic fluorescence spectrometry（ AFS）,X-ray fluorescence spectrometry（ XRF）,inductively coupled plasma mass spectrometry（ ICP-MS） and other methods were used to test the content of elements.The mathematical statistical method was applied to analyze the elements occurrence.The results show that the Mo,Cd,Sb,U and As are distinct enrichment,Li,W,Pb and Bi are the relative enrichment.The elements content of Li,Bi,Tl,Sb,As,Mo,Pb,Cd,U,Th and Hf are increased,Be is relative stable and W is increased firstly and decreased again with the density increase of coal samples in different density samples.Correlation analysis shows that Mo,U,Sb,Cd and Bi mainly occur in silicate mineral adsorption.Pb and As are related to sulfide minerals; Si,Ti,Li and Th have phosphate and aluminum silicate affinity.Hf and Zr may mainly occurs in zircon,and Be and W have a distinct organic affinity.