Full
Outline
In the process of pipeline transportation of tailings slurry from beneficiation plant to filling preparation station, changing the feed parameters will change the spatial distribution of tailings solid particles in the pipeline, which will affect the safety and stability of slurry pipeline transportation. Taking the sulfide ore tailings transported by pipeline from a tin ore beneficiation plant in Yunnan to filling preparation station as the research object, the rheological parameters of the tailings slurry were obtained by rheological test. The ANSYS-FLUENT numerical simulation software was used to simulate and analyze the pipeline transportation of the tailings slurry. The relationship between the relative height of the bottom bed layer and the feed parameters was fitted, and a three-dimensional relationship model between the relative height of the bottom bed layer and the feed speed and volume concentration was established. The results show that the three-dimensional relationship model between the relative height of the bottom bed layer and the feed speed and volume concentration has a good fitting effect. Most of the coarse particles with a size of +120 mesh have sedimentation in the bottom bed layer. Some of the fine particles with 120−200 mesh have sedimentation at the bottom bed layer of the pipeline when the feed speed is 1 m/s, and distributed in the carrier layer when the feed speed is above 2 m/s. More fine particles of －200 mesh are distributed in the carrier layer. There is water in the boundary layer of the top wall of the pipeline and the slurry formed by some very fine particles and water, which together form the boundary layer. The change of volume concentration of tailings slurry along the radial direction can be divided into four regions. There is a gradient decreasing effect from the bottom wall of the pipeline to the carrier-bottom bed interface, it gradually increases to stability from the carrier-bottom bed interface to the stable radial volume concentration of the slurry. It remains stable after reaching the maximum value in the stable constant region of radial volume concentration, the radial volume concentration gradually decreases from the stable point to the top wall of the pipe.
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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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