Full
Outline
For the highly acidic extraction system of zirconium and hafnium, ceramic and PTFE baffles were selected and their hydrodynamic (dispersed phase holdup and droplet diameter) characteristics and mass transfer performance were compared and analyzed. The results show that the PTFE baffle, due to its strong hydrophobicity, is difficult to form droplets, but its holdup is significantly higher than that of the ceramic baffle. At low pulse intensities, the extraction efficiencies of the ceramic baffle and the PTFE baffle are comparable and increase with the increase of pulse intensity. When the pulse intensity increases to 10 mm/s, the ceramic baffle can achieve two theoretical stages of mass transfer, but the extraction rate of the PTFE baffle drops rapidly. By comparing the mass transfer performance of the baffles with that of the traditional Raschig ring packing, it is found that the extraction effect of the ceramic baffle is significantly higher than that of the Raschig ring packing, verifying the applicability of the baffle extraction column. Finally, a prediction model for the dispersed phase holdup, droplet diameter and mass transfer coefficient in the baffle extraction column was established. The research results can provide a theoretical basis for the design of zirconium and hafnium baffle extraction columns.
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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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