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In view of the "bimodal" particle size distribution phenomenon of U3O8 raw materials, the process concept of rapid dissolution of fine U3O8 and continuous dissolution of large U3O8 at the bottom of the equipment was put forward, and a tank-type continuous dissolution device was designed. The rationality of the proposed tank-type dissolution device, the feasibility of the continuous dissolution process of U3O8 in nitric acid, and its applicability to different raw materials were verified through micro, small-scale,and pilot tests. The results show that under the conditions of the nitric acid concentration of 6 mol/L, dissolution temperature of approximately 60 ℃, and residence time of 40 minutes, U3O8 from different sources can be effectively dissolved, the uranium mass concentration in the dissolution solution is 350~400 g/L.
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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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