Feasibility of Recycling Bayer Process Red Mud for the Safety Backfill Mining of Layered Soft Bauxite under Coal Seams
The mining of layered soft bauxite under coal seams (BCS) will cause serious underground goaf disasters and surface Bayer process red mud (BRM) pollution. In order to realize the safe and efficient mining of BCS, the feasibility of recycling BRM as a backfilling aggregate was explored. A series of t...
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MDPI AG
2021-07-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/11/7/722 |
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| author | Shuai Li Rui Zhang Ru Feng Boyi Hu Guojun Wang Haoxuan Yu |
| author_facet | Shuai Li Rui Zhang Ru Feng Boyi Hu Guojun Wang Haoxuan Yu |
| author_sort | Shuai Li |
| collection | DOAJ |
| description | The mining of layered soft bauxite under coal seams (BCS) will cause serious underground goaf disasters and surface Bayer process red mud (BRM) pollution. In order to realize the safe and efficient mining of BCS, the feasibility of recycling BRM as a backfilling aggregate was explored. A series of tests were conducted to prevent the pollution diversion of BRM from surface storage to underground goafs, and a numerical simulation analysis of the backfilling mining process was carried out based on FLAC<sup>3D</sup> to protect the overlying coal seam. The results show that: under the action of encapsulation, solidification and inhibiting precipitation from cementitious materials, the leaching concentration of harmful substances in red mud-based cemented backfill (RCB) can be reduced 70% more than fresh BRM. Mining disturbance redistributes the in-situ stress field of overlying strata; normal backfilling can not only reduce the pressure stress of pillars, but also release the tensile stress in the roof and floor from +0.4956 MPa to −0.1992 MPa, effectively preventing roof subsidence. Since the creep damage process of past backfill will absorb and dissipate lots of energy, the disturbance range caused by backfill mining is controlled within 3 m, which is only 10% of the open-stope method. |
| first_indexed | 2024-03-10T09:31:25Z |
| format | Article |
| id | doaj.art-5da4eb1569c44a94bf55e6649e8714c7 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T09:31:25Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-5da4eb1569c44a94bf55e6649e8714c72023-11-22T04:27:34ZengMDPI AGMinerals2075-163X2021-07-0111772210.3390/min11070722Feasibility of Recycling Bayer Process Red Mud for the Safety Backfill Mining of Layered Soft Bauxite under Coal SeamsShuai Li0Rui Zhang1Ru Feng2Boyi Hu3Guojun Wang4Haoxuan Yu5School of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaThe mining of layered soft bauxite under coal seams (BCS) will cause serious underground goaf disasters and surface Bayer process red mud (BRM) pollution. In order to realize the safe and efficient mining of BCS, the feasibility of recycling BRM as a backfilling aggregate was explored. A series of tests were conducted to prevent the pollution diversion of BRM from surface storage to underground goafs, and a numerical simulation analysis of the backfilling mining process was carried out based on FLAC<sup>3D</sup> to protect the overlying coal seam. The results show that: under the action of encapsulation, solidification and inhibiting precipitation from cementitious materials, the leaching concentration of harmful substances in red mud-based cemented backfill (RCB) can be reduced 70% more than fresh BRM. Mining disturbance redistributes the in-situ stress field of overlying strata; normal backfilling can not only reduce the pressure stress of pillars, but also release the tensile stress in the roof and floor from +0.4956 MPa to −0.1992 MPa, effectively preventing roof subsidence. Since the creep damage process of past backfill will absorb and dissipate lots of energy, the disturbance range caused by backfill mining is controlled within 3 m, which is only 10% of the open-stope method.https://www.mdpi.com/2075-163X/11/7/722Bayer process red mud (BRM)red mud-based cemented backfill (RCB)backfill mining technologylayered soft rocksbauxite under coal seams (BCS) |
| spellingShingle | Shuai Li Rui Zhang Ru Feng Boyi Hu Guojun Wang Haoxuan Yu Feasibility of Recycling Bayer Process Red Mud for the Safety Backfill Mining of Layered Soft Bauxite under Coal Seams Minerals Bayer process red mud (BRM) red mud-based cemented backfill (RCB) backfill mining technology layered soft rocks bauxite under coal seams (BCS) |
| title | Feasibility of Recycling Bayer Process Red Mud for the Safety Backfill Mining of Layered Soft Bauxite under Coal Seams |
| title_full | Feasibility of Recycling Bayer Process Red Mud for the Safety Backfill Mining of Layered Soft Bauxite under Coal Seams |
| title_fullStr | Feasibility of Recycling Bayer Process Red Mud for the Safety Backfill Mining of Layered Soft Bauxite under Coal Seams |
| title_full_unstemmed | Feasibility of Recycling Bayer Process Red Mud for the Safety Backfill Mining of Layered Soft Bauxite under Coal Seams |
| title_short | Feasibility of Recycling Bayer Process Red Mud for the Safety Backfill Mining of Layered Soft Bauxite under Coal Seams |
| title_sort | feasibility of recycling bayer process red mud for the safety backfill mining of layered soft bauxite under coal seams |
| topic | Bayer process red mud (BRM) red mud-based cemented backfill (RCB) backfill mining technology layered soft rocks bauxite under coal seams (BCS) |
| url | https://www.mdpi.com/2075-163X/11/7/722 |
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