Effect of different waste rock in-site dumping strategies on the permeability performance of waste rock and cemented tailings co-backfilling for a high iron mine stope AITranslate

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Chinese Library Classification Number:TD853.34[矿业工程—金属矿开采]

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Waste rock and tailings represent the primary solid wastes generated in metal mining.Underground co-backfilling with waste rock and cemented tailings offers an effective approach for the large-scale utilization of these materials.However,quantitative methods for characterizing the permeability and compactness of such composite backfill systems remain limited.In this study,semi-industrial surface experiments were conducted using a self-developed experimental device combined with infrared imaging technology.Three dumping sequences—waste rock followed by slurry,slurry followed by waste rock,and simultaneous dumping—and three accumulation angles of waste rock(90°,60°,and 30°)were investigated.The compactness of the co-backfill and the permeability of cemented tailings slurry within waste rock voids were quantitatively analyzed.Results show that simultaneous dumping yields the highest compaction,although practical constraints may limit its application.Therefore,a sequence of slurry dumping followed by waste rock,at a volume ratio of 3:2,is recommended.Moreover,the inclination angle of waste rock piles was found to be positively correlated with slurry penetration.A quantitative relationship between slurry permeability and the contact surface area was established,expressed as the penetration volume per unit area,with values of 0.185 m³/m²and 0.107 m³/m²depending on whether the pile base was in contact with the stope boundary.Based on these findings,a co-backfilling strategy for high stopes in iron mines is proposed,providing a technical basis for the efficient utilization of mine waste through integrated waste rock–tailings backfilling.