Geochemical Characteristics of Associated Elements in No.5 Coal of Wujiagou Coalfield

In order to study the geochemical characteristics of the associated elements in the Southern Datong Coalfield, this paper analyzed the content and occurrence characteristics of associated elements in No.5 coal in Wujiagou Coalfield by using of X-ray fluorescence spectrometry (XRF), inductively coupled plasma mass spectrometry (ICP-MS), X-ray diffraction analysis (XRD), scanning electron microscopy and energy spectrum analysis (SEM-EDS).The results show that the contents of Al, Si, Ca and Fe were enriched in Wujiagou No.5 coal, accounting for more than 95% of the total ash content. The Al mainly exists in kaolinite. Si is mainly deposited in clay minerals and quartz. The main carrier of Ca in coal is calcite. Fe exists mainly as pyrite in coal. Li is enriched, and Ga, Sr, Zr, Nb, Hf, and Ta are slightly enriched. Li and Ga mainly occur in kaolinite. Nb and Ta occur in clay minerals, some of which may in illite. Zirconium and hafnium also occur in clay minerals, and some in rutile.