Geochemical characteristics of minerals in coal in North China Coal Hosting Area
YANG Chengwei
Abstract：The focus of coal washing is to remove impurities in coal.The combination characteristics and occurrence forms of minerals in coal will affect the removal efficiency of minerals in coal,and the influence of mineral occurrence forms and dissemination characteristics is particularly prominent.It is of great practical significance to study the geo-chemical characteristics of minerals in coal in North China Coal Hosting Area,improve the removal efficiency of min-erals after washing in the clean development of industrialized coal,and then reduce the emission pollution of minerals in the process of coal utilization.In view of the urgent need for green utilization of non-high-quality coal resources in China,based on coal geology,coal formed in different sedimentary environments is taken as the research object,and conventional and state-of-the-art scanning electron microscope+energy spectrum(SEM-EDX),X-ray diffrac-tion spectrum(XRD),X-ray fluorescence spectrum(XRF)and other means and methods in the field of geology are used to study the occurrence characteristics of minerals in coal.The coal in the study area mainly contains clay miner-als,quartz and calcite,as well as other minerals such as tridymite,analcime,siderite,calcite,rare anatase,po-tassium feldspar,hematite,barite,glauberite,anatase,gypsum,aragonite,goethite,apatite and sodalite.There are various forms of minerals in the coal,such as berry ball,fine dispersion,agglomerate,fissure filling,plate,flake,wormlike,cell cavity filling and so on.The existence of analcime,aragonite,illite-smectite mixed layer,magnesite and dolomite,glauberite symbiosis and other iconic minerals in the coal is the mineralogical evi-dence of the influence of seawater during the development of coal seams.The symbiotic combination of magnesite and glauberite minerals can indicate that the coal seam is subjected to the combined action of surface water or continen-tal groundwater and seawater,which is most likely to represent the tidal flat-lagoon environment.The lepidolite found in coal has a good hexagonal bipyramidal shape,and its particle size is larger than that of authigenic quartz particles.It belongs to volcanic ash input or residual high-temperature deformed mineral after meteorite impact on the earth.
Keywords：minerals in coalgeochemical characteristicsNorth China Coal Hosting Areaform of occurrenceclay mineralsremoval efficiency
Publication Date：2025-05-31
Pages：10( 76-85 )