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Outline
In response to the current situation where the influencing factors of the efficiency of heavy medium cyclones in uranium ore separation are unclear and the parameter settings lack theoretical basis, taking the FX250 type heavy medium cyclone as the object, a multi-phase flow numerical simulation system was constructed using the CFD-DEM coupling method. Seven sets of different feed pressure and heavy medium density comparison conditions were set up. The effects of parameters on the characteristics of the cyclone and uranium ore separation were explored from three dimensions: flow field distribution, phase structure, and particle movement. Experimental verification was carried out in conjunction with the Jiangxi volcanic rock-type uranium ore. The results show that increasing the feed pressure can optimize the flow field and the gas core structure, promoting particle stratification; the influence of heavy medium density on the flow field is weak, but it can significantly improve the separation accuracy. The test results confirm that increasing the feed pressure or the heavy medium density can improve the grade of the concentrate, but it will reduce the yield and recovery rate. Based on the experimental results, the optimal parameter range for uranium ore separation using the heavy medium cyclone is determined as a feed pressure of 0.13-0.14 MPa and a dense medium density of 2.60-2.65 g/cm3.
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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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