School of Chemistry and Environment,North China Institute of Science and Technology; State Key Laboratory of Groundwater Protection and Utilization by Coal Mining; Shenhua Shendong Coal Group Co.,Ltd.,; China Coal (Beijing) Environmental Engineering Co.,Ltd.,

Coal resource is rich and water resource is scare in the Shendong coal mining area.High fluoride (F-) mine water has become a restricted factor for its recycling and utilization.However,the spatial distribution,source,and enrichment mechanisms of fluoride have not been fully understood.In this study,62 water samples were collected from the Shendong coal mining area,Shanxi,China.Samples were analyzed to investigate the distribution,geochemical behavior,and formation mechanisms of fluoride by the correlation analysis,statistics and ions ration analysis combined with geological and hydrogeological conditions.The results show that the F-concentrations in the mine water samples range from 0.16 to 12.75 mg/L,with a mean value of 5.01 mg/L.About 77.78% of the mine water samples exceed China’s national standards (1.00 mg/L) of F-concentration.The F-concentrations in the mine water is generally higher in the northwest and lower in the southeast of Shendong coal mining area.The high F-mine water is mainly distributed in the Buertai and Wulan Mulun mines and in the depth of 150-300 m,respectively.The F-in the mine water is enriched in a water environment with high alkaline,high TDS,Na+,HCO-3 and low Ca2+content.The Yan’an groundwater is the main F-source of high F-mine water.The weathering of F-bearing minerals is the main source of F-in the mine water.Precipitation of dolomite and calcite reduces the Ca2+ content and promotes the dissolution of fluorite,generating an elevated F-content.The cation exchange contributes to the increase of Na+ content and the high HCO-3 environment reduces the adsorption capability of minerals,which promote the leaching of F-into the mine water.Whereas,the evaporation and anthropogenic activities effect can be ignored.

国家自然科学基金资助项目(41572344);“煤炭开采水资源保护与利用” 国家重点实验室开放课题资助项目(SHJT-17-42.17);财政部自然资源部山水林田湖草联合修复专项资助项目(LCG2020009)

郝春明，张伟，何瑞敏，等.神东矿区高氟矿井水分布特征及形成机制
[J].煤炭学报,2021,46(6):1966-1977.
HAO Chunming,ZHANG Wei,HE Ruimin,et al.Formation mechanisms for elevated fluoride in the mine water in Shendong coal mining district[J].Journal of China Coal Society,2021,46(6):1966-1977.