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After the separation of iron and rare earth for ore in Main and East Mines of Bayan Obo, the content of Nb2O5 in rare earth flotation tailings is enriched from 0.14% to 0.19%. The bulk flotation is adopted to separate easy-floating minerals in advance so as to reduce the impacts of easy-floating minerals in desilting on subsequent niobium flotation as well as the combined process of flotation and magnetic separation that bulk flotation of tailings-selective flotation of sulfur-flotation of iron-niobium flotation of iron tailings-high intensity magnetic separation of niobium concentrate is adopted to separate niobium industrially aiming at the high content of easy-floating minerals as well as close paragenesis and inclusions of niobium minerals and iron minerals. The bulk flotation is carried out under the conditions that the proportion of size fraction of -0.043 mm for grind fineness is 90%, dosage of TD-V collecting agent is 1.0 kg/t and dosage of depressor, the sodium silicate is 2.0 kg/t, sulfur flotation is carried out under the condition that dosage of butyl xanthate is 1.4 kg/t, iron flotation is carried out under the conditions that dosage of ammonium fluosilicate is 8.5 kg/t and dosage of collecting agent, the SZ fatty acid sodium salts is 0.5 kg/t as well as niobium roughing is carried out under the condition that dosages of CMC, C5-9 and alum are 1.2 kg/t, 2.2 kg/t and 0.72 kg/t respectively. The niobium concentrate of flotation with grade of Nb2O5 of 2.21% is obtained by adopting the niobium flotation process of one roughing and one concentration as well as the niobium concentrate with grade of Nb2O5 of 4.41% and sub-niobium concentrate with grade of Nb2O5 of 0.96% are obtained through high intensity magnetic separation of 1.7 T so that recovery rate of niobium metal is 34.85% with the combination process of flotation and magnetic separation.
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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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