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In the paper, the orthogonal test was used to investigate the effects of reaction temperature, reaction time and material layer thickness on tailings after beneficiation of rare earth in Bayan Obo with carbon thermal reduction. The results showed that the coke powder with high volatile content was beneficial to obtain the reduced tailings after beneficiation of rare earth with high metallization ratio. The main factors affecting the metallization ratio of the reduced tailings after beneficiation of rare earth were reaction temperature, reaction time and material layer thickness in turn. The optimum test conditions were that the coke powder with volatile content of 12.6% and particle size of 0~2 mm was used as reductant, the reaction temperature was 1 000 ℃, the reaction time was 4.5 h and the material layer thickness was 10 mm.
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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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