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Outline
Aiming at the problems of large ore depletion rate and serious surface subsidence in Shizhuyuan Polymetallic Mine by caving mining, it is proposed to use filling mining method. Physical and chemical properties test of tailings, static and dynamic flocculation and settlement test were carried out, combined with the actual production capacity of the mine, the optimum thickening parameters of tailings and thickener size were determined. The particle swarm optimization support vector machine (PSO-SVM) was used to establish the sand discharge stability prediction model, and the optimum sand discharge process parameters were obtained. The results show that the optimum type of flocculant is CKYZ-24S, its optimum dosage is 30 g/t, the optimum feed mass concentration of the unclassified tailings is 12.5%, the optimum feeding rate of the tailings is 0.744 t/(m2h), and the diameter of the thickener is determined to be 12 m. The optimum sand discharge process parameters are as follows: the height of the tailings mud layer is 15.2 m, the thickening time is 3.9 h, the flow rate of sand discharge is 96 m3/h, and the average mass concentration of slurry is 70%, with fluctuation of ± 1.5%, which realizes 24 h continuous filling of tailings, and the filling capacity reaches 4 800 m3/d. The research results show that the filling mining method can improve the economic benefits and ensure the green and safe mining of the mine.
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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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