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Environmental risk assessment of industrial byproduct gypsum utilized for flling abandoned mines

International Journal of Coal Science & Technology 2022年第4期9卷 214-225页

作者： XueHong Du Xiangdong Li Qiyan Feng Lei Meng Yue Sun School of Environment Science and Spatial Informatics China University of Mining and TechnologyXuzhou 221116China The National and Local Joint Engineering Laboratory of Internet Application Technology On Mine China University of Mining and TechnologyXuzhou 221008Jiangsu ProvinceChina IoT Perception Mine Research Center China University of Mining and TechnologyXuzhou 221008Jiangsu ProvinceChina Jiangsu Vocational Institute of Architectural Technology No.26 Xueyuan RoadXuzhou 221433China

In response to the basic policy of green and low-carbon circular development to solve resource,environmental and ecological problems,gypsum is considered to be a flling material for mine backflling.To explore the potential risks of gypsum to the groundwater environment due to the backflling of abandoned mines,a sequential batch leaching experiment was carried out in this paper,which used three types of industrial waste gypsum,namely,phosphorus gypsum(PG),titanium gypsum(TG)and fue gas desulfurization gypsum(FGDG).COMSOL Multiphysics 5.4 software was used to simulate and solve the migration process of the leached metal elements in the mine foor when these three gypsum types were used as flling materials to observe the concentration distributions and difusion distances of the metal elements from these three gypsum types in the mine foor.The results show that(1)during repeated contact of the three types of industrial waste gypsum with the leaching medium,the pH levels changed,and the changes in pH afected the leaching patterns for the heavy metal elements in the gypsum.(2)Based on the concentrations of the metal elements that were leached from the three types of gypsum,it can be determined that these three types of gypsum are not classifed as hazardous solid wastes,but they cannot be ruled out with regard to their risk to the groundwater environment when they are used as mine flling materials.(3)When the three types of gypsum are used as flling materials,the concentration distributions of the metal elements and their migration distances all exhibit signifcant changes over time.The concentration distributions,difusion rates and migration distances of the metal elements from the diferent gypsum types are afected by their initial concentrations in the leachate.The maximum migration distances of Zn in the foor from the PG,FGDG and TG are 8.2,8.1 and 7.5 m,respectively.

关键词： Industrial solid waste gypsum Coal mine back-flling Leaching of metal elements Patterns of migration

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