Full
Outline
For the production line of comprehensive utilization of oxidized ore resources in Bayan Obo, iron and rare earth separations are carried out after two-stage closed-circuit grinding of raw ore as well as fluorite separation is carried out when rare earth tailings are ground to the proportion of particle size<30 μm is over 70%. The multistage grinding causes significant increase of mechanical secondary slime as well as electrostatic repulsion between fine slime particles is strengthened so as to inhibit sedimentation when circulating wastewater is with alkalescence by adding a large amount of sodium silicate and foaming agent during beneficiation process, the silica sol generated by sodium silicate is absorbed on the surface of fine slime particles so as to form coating layer. As a result, the hydrophobic property of particle surface is reduced and affinity of it and water is enhanced so that fine slime particles are more dispersed and stable as well as the content of suspended solids (SS) in water reaches over 5 000 mg/L. The beneficiation wastewater is treated with the process of magnetic coagulating sedimentation-stirring-flocculation-stirring as well as the content of SS in wastewater is reduced to 69 mg/L and pH value is basically unchanged. The flotation test is carried out for circulating wastewater after treatment, it is better for circulating wastewater after treatment to improve the grade and metal recovery rate of iron, rare earth and fluorite than those for circulating wastewater without treatment as well as the dosage of reagents in every link is significantly reduced.
108
25
| 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 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
