河南理工大学学报（自然科学版）2025，Vol.44Issue(2)：90-98,9.DOI:10.16186/j.cnki.1673-9787.2023030059
F-在煤矿采空区充填矸石中运移规律及其随达西流速变化特征
F-transport law in a coal mine goaf filled with gangue and its variations characteristics with Darcy flow velocity
摘要
Abstract
During coal mining,the massive accumulation of coal gangue and its pollution effects on ground-water have become pressing issues in ecological environment management and resource utilization.Objec-tives Using coal gangue to backfill goafs as a storage space for purified mine water can not only achieve re-source utilization of coal gangue but also help remove fluoride from mine water.This provides an economi-cal and environmentally friendly solution.Methods This study focuses on fluoride in mine water,using coal gangue from the Baode mine goaf as the backfill medium.Based on the hydrogeological conditions of the study area,column simulation experiments were performed at 25 ℃ with Darcy flow velocities of 6.24,3.12,and 1.56 cm/h.Experimental data were numerically simulated using the Convection-Dispersion Equa-tion(CDE)model and the Two-Site Model to explore the transport behavior of fluoride under different flow velocities.Results The experimental results showed that chloride acted as a non-reactive tracer,and their breakthrough time was negatively correlated with flow velocity.The CDE model effectively described their migration behavior,and dispersion increased with the rise in Darcy flow velocity.For F-migration,the Two-Site Model provided a better representation of the migration process compared to the CDE model.Coal gangue demonstrated significant adsorption-retardation effects on fluoride,with the retardation factor R and adsorption capacity increasing as the flow velocity decreased.The equilibrium adsorption site fraction(f value)and distribution coefficient(β value)of fluoride on coal gangue also increased with decreasing flow velocity,while the first-order kinetic adsorption rate constant(α)decreased.This indicates that equilib-rium adsorption becomes more dominant as the flow velocity decreases during solute migration.Addition-ally,as leachate was continuously injected,OH-on the surface of the coal gangue were gradually replaced by F-through ion exchange adsorption,leading to an increase in the pH of the effluent.This pH increase was more pronounced at lower flow velocities.Conclusions The results could not only provide a theoretical basis for the purification of high-fluoride mine water but also alleviate the environmental pressure caused by coal gangue accumulation,offering significant environmental and economic benefits with promising poten-tial for broader application.关键词
煤矸石/氟化物/溶质运移/弥散系数/阻滞系数/双点位吸附溶质运移模型Key words
coal gangue/fluoride/solute transport/dispersion coefficient/retardation coefficient/two-site model分类
环境科学引用本文复制引用
赵丽,贾祥腾,张庆,许峰,朱开鹏,孔伟芳,邢明飞,金毅..F-在煤矿采空区充填矸石中运移规律及其随达西流速变化特征[J].河南理工大学学报（自然科学版）,2025,44(2):90-98,9.基金项目
国家自然科学基金资助项目(41972175) （41972175）
陕西省煤矿水害防治技术重点实验室开放基金资助项目(2021SKM04) （2021SKM04）
河南省科技攻关计划项目(212102310502) （212102310502）
河南省高等学校重点科研项目(22B610002) （22B610002）
河南理工大学博士基金资助项目(B2022-38) （B2022-38）
