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The flotation process is the main method for removing impurity element fluorine in magnetic iron ore of Bayan Obo. The indicators and productivity of flotation operation can be effectively improved by reasonably selecting process flow of flotation. The existing flotation process is analyzed aiming at such problems as high iron grade and low productivity of flotation tailings as well as high consumption of reagent for flotation operation of magnetic iron ore of Bayan Obo. It is found that the gap between iron grades of foam in the first and second stages of rougher flotation is great, the iron grade of foam in the first stage is lower than that of flotation tailings, and then it is mixed with foam in the second stage to enter operation of scavenging so that the iron grade of flotation tailings is high and productivity of flotation is low. The foam in the first stage of roughing for flotation is directly with discarding tailings and conditions of flotation operation are reoptimized. In actual production, the iron grade of flotation tailings is decreased by 5.34 percentage points and productivity of flotation concentrate is increased by 6.16 percentage points after improving the process.
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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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