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Outline
Pipeline transportation is a crucial component of mine filling systems, and the rheological parameters of the filling slurry are essential for pipeline transport design. Taking the unclassified tailings filling slurry of Daye Iron Mine as the research object, the rheological parameters and pipeline transportation characteristics were studied by rheological test and Fluent numerical simulation. The results indicate that when the slurry mass concentration is between 60% and 70%, the fitted relationship curve between shear stress and shear rate conforms to the change rule of Herschel-Bulkley (H-B) model. With the increase of slurry mass concentration, the yield stress and viscosity coefficient increase exponentially, and the viscosity coefficient increases significantly when the slurry mass concentration reaches 70%. When the mass concentration is 60%−65%, the slurry flow is unstable and the pressure distribution in the pipeline is uneven. When the mass concentration is between 68% and 70%, the slurry flow state is relatively stable, and the pressure is symmetrically distributed along the pipe diameter. The resistance loss of the pipeline is positively correlated with the slurry mass concentration and the slurry flow rate. When the slurry mass concentration reaches 68%, the resistance loss begins to increase significantly. It is suggested that the mass concentration of filling slurry in Daye Iron Mine should be controlled between 65% and 68%. Considering that the maximum flow velocity of slurry appears at the bottom of vertical elbow (inflection point D), where wear-resistant materials should be used. The research results can provide a theoretical basis for the design of pipeline transportation parameters of mine filling system.
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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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