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Outline
Advancements in exploration theory and equipment have significantly enhanced mine reserve expansion. However, adapting new resources in the deep periphery of mines to existing production systems requires reassessment. Green stoping-and-filling operations face challenges from varying filling gradients and existing slurry pipeline transportation parameters that no longer meet practical demands. To address these challenges, tests were conducted on the particle size distribution of backfill materials and slurry flow performance at the mine. Results identify that a reasonable range of slurry mass concentration is 70%-72%. Through theoretical analysis and calculation, the matching degree between the design parameters of the existing filling system and the orebody filling gradients was verified. The maximum gravity flow filling gradients of the slurry mass concentration of 70% and 72% are 9.31 and 5.56, respectively. Simulation models were constructed to verify the correctness of theoretical analysis. The results show that a 72% slurry mass concentration is suitable for gravity flow transportation in older mine zones with filling gradients of 2.3-4.9, while reducing concentration to 70% enables gravity filling in high-gradient goafs with filling gradients of 7.2-8.7 in newly developed zones. For the mine to achieve optimal technical and economic performance, two schemes are proposed:implementing additional pumps to transport slurry with a mass concentration of 72% under pressure(first scheme), and utilizing slurry with a mass concentration of 70% for gravity flow (second scheme). A comparative analysis shows that the first scheme has obvious advantages and disadvantages, while the second scheme requires no technical modification, offers a more reliable process, and reduces operational costs by RMB 2 334 500 compared to the first scheme. Therefore, the second scheme is the preferred option.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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