Environmental risk assessment of industrial byproduct gypsum utilized for filling abandoned mines
Abstract 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 filling material for mine backfilling. To explore the potential risks of gypsum to the groundwater environment due to the backf...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2022-08-01
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| Series: | International Journal of Coal Science & Technology |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s40789-022-00520-1 |
| _version_ | 1811320792395284480 |
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| author | XueHong Du Xiangdong Li Qiyan Feng Lei Meng Yue Sun |
| author_facet | XueHong Du Xiangdong Li Qiyan Feng Lei Meng Yue Sun |
| author_sort | XueHong Du |
| collection | DOAJ |
| description | Abstract 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 filling material for mine backfilling. To explore the potential risks of gypsum to the groundwater environment due to the backfilling 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 flue 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 floor when these three gypsum types were used as filling materials to observe the concentration distributions and diffusion distances of the metal elements from these three gypsum types in the mine floor. 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 affected 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 classified 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 filling materials. (3) When the three types of gypsum are used as filling materials, the concentration distributions of the metal elements and their migration distances all exhibit significant changes over time. The concentration distributions, diffusion rates and migration distances of the metal elements from the different gypsum types are affected by their initial concentrations in the leachate. The maximum migration distances of Zn in the floor from the PG, FGDG and TG are 8.2, 8.1 and 7.5 m, respectively. |
| first_indexed | 2024-04-13T13:05:41Z |
| format | Article |
| id | doaj.art-debb07a521784887830fa84b337aad8c |
| institution | Directory Open Access Journal |
| issn | 2095-8293 2198-7823 |
| language | English |
| last_indexed | 2024-04-13T13:05:41Z |
| publishDate | 2022-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | International Journal of Coal Science & Technology |
| spelling | doaj.art-debb07a521784887830fa84b337aad8c2022-12-22T02:45:47ZengSpringerOpenInternational Journal of Coal Science & Technology2095-82932198-78232022-08-019111210.1007/s40789-022-00520-1Environmental risk assessment of industrial byproduct gypsum utilized for filling abandoned minesXueHong Du0Xiangdong Li1Qiyan Feng2Lei Meng3Yue Sun4School of Environment Science and Spatial Informatics, China University of Mining and TechnologySchool of Environment Science and Spatial Informatics, China University of Mining and TechnologySchool of Environment Science and Spatial Informatics, China University of Mining and TechnologyThe National and Local Joint Engineering Laboratory of Internet Application Technology On Mine, China University of Mining and TechnologyJiangsu Vocational Institute of Architectural TechnologyAbstract 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 filling material for mine backfilling. To explore the potential risks of gypsum to the groundwater environment due to the backfilling 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 flue 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 floor when these three gypsum types were used as filling materials to observe the concentration distributions and diffusion distances of the metal elements from these three gypsum types in the mine floor. 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 affected 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 classified 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 filling materials. (3) When the three types of gypsum are used as filling materials, the concentration distributions of the metal elements and their migration distances all exhibit significant changes over time. The concentration distributions, diffusion rates and migration distances of the metal elements from the different gypsum types are affected by their initial concentrations in the leachate. The maximum migration distances of Zn in the floor from the PG, FGDG and TG are 8.2, 8.1 and 7.5 m, respectively.https://doi.org/10.1007/s40789-022-00520-1Industrial solid waste gypsumCoal mine back-fillingLeaching of metal elementsPatterns of migration |
| spellingShingle | XueHong Du Xiangdong Li Qiyan Feng Lei Meng Yue Sun Environmental risk assessment of industrial byproduct gypsum utilized for filling abandoned mines International Journal of Coal Science & Technology Industrial solid waste gypsum Coal mine back-filling Leaching of metal elements Patterns of migration |
| title | Environmental risk assessment of industrial byproduct gypsum utilized for filling abandoned mines |
| title_full | Environmental risk assessment of industrial byproduct gypsum utilized for filling abandoned mines |
| title_fullStr | Environmental risk assessment of industrial byproduct gypsum utilized for filling abandoned mines |
| title_full_unstemmed | Environmental risk assessment of industrial byproduct gypsum utilized for filling abandoned mines |
| title_short | Environmental risk assessment of industrial byproduct gypsum utilized for filling abandoned mines |
| title_sort | environmental risk assessment of industrial byproduct gypsum utilized for filling abandoned mines |
| topic | Industrial solid waste gypsum Coal mine back-filling Leaching of metal elements Patterns of migration |
| url | https://doi.org/10.1007/s40789-022-00520-1 |
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