摘要：In order to analyze the characteristics of coal quality composition of Shanxi Formation 2# in Ningwu Coal Mine,Shanxi Province,the content characteristics,occurrence state and enrichment mechanism of the elements in the coal were discussed.X-ray fluorescence spectroscopy (XRF) is used to determine the content of major elements in coal and gangue,X-ray diffraction (XRD) is used to analyze the mineral composition of coal,scanning electron microscope + energy spectrum (SEM-EDX) is employed to observe the morphological characteristics of minerals,the inductively coupled plasma mass spectrometer (ICP-MS) is used to determine the content of trace elements in coal and gangue,and the progressive chemical extraction (SCEP) is employed to determine the presence of trace elements in coal.Experimental studies have shown that the minerals in Shanxi Formation 2# coal are mainly clay minerals and calcite.The clay minerals are mainly kaolinite,which is derived from terrigenous clastic materials.Calcite is a metagenetic mineral,which is precipitated in the circulating water of the cracks or voids in the coal.The trace elements Li,Cu,Ga,In,and Hf are slightly enriched,and Zr and Nb are enriched.There is a positive correlation between some trace elements and ash,which indicates that these trace elements are mainly contained in inorganic minerals,and some trace elements have no obvious or negative correlation with ash,which indicates that in addition to inorganic minerals,trace elements are also present in organic matter.
