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Outline
In order to efficiently separate copper ore, a stacked step flow separation model was proposed according to Knelson concentrator based on centrifugal gravity separation technology combined with reverse fluidization and step flow principle, and secondary separation was realized on the basis of centrifugal separation. The distribution of pressure, tangential velocity and axial velocity in the separation flow field of the stacked step flow model was analyzed by Fluent software. The effects of rotational speed and reverse flow velocity on the separation characteristics of copper ore were studied. The results show that the pressure distribution of the flow field increases gradually from the center to the wall surface. However, due to the presence of reverse flow force, the maximum pressure does not fully fit the wall surface. The abrupt change of tangential velocity at the step indicates that there is a vortex, which is conducive to the separation of light particles. The axial velocity as a whole presents an upward flow, which is conducive to the discharge of light particles from the upper outlet after separation. The axial volume concentration distribution of Cu particles shows a decreasing trend from bottom to top, and the radial volume concentration is the highest near the wall surface, while the volume concentration of SiO2 particles is the highest at the top of the axial direction, and the volume concentration is lower at the radial direction. When the feed speed is 0.5 m/s, rotational speed is 50 r/min, and reverse flow velocity is 0.012 m/s, it can be obtained that the recovery of Cu particles is 87.70%, and enrichment ratio is 13.45. The stacked step flow model has the best effect on the separation of SiO2 particles and Cu particles. The cloud images of particle volume fraction show that Cu particles are enriched in the concave of the inner wall of the step flow, and SiO2 particles have a low volume fraction in the concave of the wall due to the separation force of vortex and reverse flow, which more directly shows the separation effect of the stacked step flow model. The research results can provide references for the improvement of centrifugal beneficiation equipment.
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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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