Full
Outline
In order to study the competition mechanism of particle migration and settlement behavior in the process of pipeline transportation of unclassified tailings paste slurry, Electrical Resistance Tomography (ERT) was used to carry out pipeline transportation tests on paste slurry with mass concentration of 60% and coarse particle content of 0, 5%, 10% and 15%, respectively. Based on the Maxwell equation, the conductivity-mass concentration mapping model was established. The plunger flow structure was reconstructed by the conductivity distribution, and the regression equation of the mass concentration and the coarse particle content in the plunger area was established. The results show that the conductivity and slurry mass concentration in the central area of the pipeline are higher than those in the side wall area, and the particle migration behavior forms a typical plunger flow structure. With the increase of coarse particle content, there are "optimal point" (4.3%) and "equilibrium point" (9.6%) of coarse particle content. When the content of coarse particles is 4.3%, the particle migration effect is the best, forming a stable particle structure flow of "fine particles carrying coarse particles". When the content of coarse particles exceeds 9.6%, the settlement effect begins to dominate, and the accumulation of particles at the bottom of the pipeline increases significantly. The ERT technology has successfully realized the dynamic visualization of the concentration field of paste pipeline transportation, revealed the dynamic balance law of particle migration-settlement, improved the stability of "plunger structure" and reduced the risk of plugging, which has a reference value for the safe transportation of paste filling.
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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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