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To address the problem of discharged overflow carrying coarse particles during classification of high-concentrated and coarse-grained ores with a large-scale hydrocyclone (Φ838 mm), it was proposed that the cone section of a hydrocyclone was truncated and an annular flat bottom was constructed. Using computational fluid dynamics (CFD), a systematic study was conducted on the influence of different ring width of that annular flat bottom on the hydrocyclone separation performance. The results show that when the ring width increases from 0 to 50.28 mm, the yield of extremely coarse particles within the size fraction (+212 μm) in the hydrocyclone overflow decreases from 49.97% to 28.08%, and the yield of particles within the size fraction (10-212 μm) increases from 40.64% to 57.80%. A scaled-down hydrocyclone model (Φ100 mm) was fabricated based on the similarity principle, and laboratory tests were carried out with it. It is found that in variation of the separation performance of the Φ100 mm hydrocyclone with the ring width of annular flat bottom is highly consistent with the simulation results of the Φ838 mm hydrocyclone. This has verified that the classification of high-concentrated and coarse-grained ore, a hydrocyclone with its conical section structured with an annular flat bottom can effectively prevent overflow of coarse particles and increase the percentage of particles within the effective size fractions.
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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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