【摘要】 应用带能谱的扫描电镜(SEM-EDX)、X射线衍射(XRD)、X射线荧光(XRF)等方法研究了桂中合山煤田合山组灰分小于50%的煤层样品矿物组成、常量和微量元素的地球化学特征.结果表明:合山煤中全硫含量在5.3%~11.6%之间,与惰质组相比,有机硫更易在镜质组中富集;合山煤中的矿物有石英、方解石、白云石等,并有少量的白铁矿、伊/蒙混层黏土矿物、红磷铁矿等,结合电镜观察,认为这些矿物主要形成于泥炭堆积压实前的同生作用;同世界煤相比,W,U,Mo,Cr,V,Zr明显富集.根据微量元素同常量元素、灰分和硫分的相关性,将微量元素分为5种结合态.更多还原

【Abstract】 The sulphur species,mineralogy,and major and trace element geochemistry of coals of the Late Permian Heshan Formation in the Heshan Coalfield,central Guangxi,were investigated using scanning electron microscopy with an energy-dispersive X-ray(SEM-EDX),X-ray diffraction(XRD)and X-ray fluorescence(XRF) etc.The results show that the sulphur content in the Heshan coals ranges from 5.3% to 11.6%,and vitrinites are more enriched with organic sulphur compared to inertinites.The XRD analysis,coupled with optical and scanning electron microscopy,show that the minerals in these coals are mainly quartz,calcite,dolomite etc,as well as some oxidised weathering products such as gypsum, are also present.Most trace elements in the Heshan coals are enriched with respect to their world means,with W,U,Mo,Cr,V,Zr being highly enriched.The trace elements are believed to be associated with five combined.更多还原