Full
Outline
Pipeline transportation of tailings slurry is the key to efficient tailings discharge in mines. In order to explore the variation law of flow resistance of mine tailings slurry during pipeline transportation, the influence of multiple factors such as flow velocity, transportation pipe diameter, slurry mass concentration and their interaction on the flow resistance of tailings slurry transportation was analyzed by orthogonal test, and the pipeline transportation parameters of tailings slurry were optimized. The results are as follows. Firstly, the F value of the established regression model is 4 660.66, the P value is less than 0.000 1, and the fitting value R2is 0.997, indicating that the model has high reliability. The model can accurately characterize the change of the resistance along the slurry transportation under different working conditions. Secondly, when the flow rate is low(1−2 m/s), the slope of the curve of the resistance loss along the way is small. When the flow rate is greater than 2 m/s, the curve of the resistance loss along the way is steeper, the resistance is greater, and it increases sharply. Thirdly, the influence degree of multi-factor interaction from large to small is the interaction of tailings slurry flow rate and mass concentration, the interaction of tailings slurry flow rate and transportation pipe diameter, and the interaction of slurry mass concentration and transportation pipe diameter. Fourthly, the optimized pipeline transportation parameters are as follows: the mass concentration of slurry transportation is 56%, the slurry transportation speed is 1.6 m/s, the transportation pipe diameter is 127 mm, and the predicted resistance along the way is 0.242 kPa/m. The measured resistance along the way in the test is 0.233 kPa/m, and the error is only 3.7%, which is within the controllable range. It shows that the accuracy of the prediction model is high, and the resistance along the way is small under this working condition, which meets the requirements of long-distance transportation. The test results provide a reference for the efficient pipeline transportation design of high mass concentration tailings slurry in mines.
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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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