Geochemical Characteristics of Trace Elements in Coal Rock and Mine Water of Xutuan Coal Mine in Huaibei Coalfield
Collect a total of 3 coal samples,2 rock samples,1 gangue sample,and 2 water samples from the 3-2,7-2,and 8-2 working faces of Xutuan Coal Mine. Test the concentration of trace elements,analyze the element content of the coal,rock,and water samples,and explore their sediment sources and sedimentary environments. The results indicate that:① Trace elements are more likely to accumulate and form minerals in inorganic rock samples (coal). The content of Mo in coal is higher than in other rock samples,indicating that Mo exists in coal in the form of association with organic matter. The trend of changes in trace element content in coal is almost consistent,and it is believed that the sedimentary environment of these three coal seams should be almost consistent. The high content of soluble Ba,Ni and Mo in coal seams leads to a higher content in water. Rare earth elements in coal are mainly present in inorganic minerals,and heavy rare earth elements have strong organic affinity. ②Compared with the Groundwater Quality Standards (DZ/T 0290—2015),the Ba,Ni,and Mo contents in the goaf water of coal seam 3-2 and the roof water of coal seam 8-2 are all high. It is believed that the content of trace elements in water is high and influenced by coal bearing strata.③Clay minerals in coal and gangue are enriched with Li,while clay minerals in coal are also enriched with V. Ga is mainly associated with clay minerals and may be associated with organic matter.④The graphical analysis of rare earth elements w (La)/w (Yb)-w (REE) indicates that the sedimentary source rocks in the study area are terrigenous clastic sediments,and are felsic. ⑤Based on the Sr/Ba Ratio,standardized rare earth patterns of chondrites,and analysis of δ Eu and δ Ce,it is believed that 3-2 coal,7-2 coal,and 8-2 coal are all terrestrial sediments and in a reductive environment.
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