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Outline
The traditional trough-type intermittent dissolution method for uranium concentrate is difficult to meet the intelligent development needs of uranium purification. The development of continuous intelligent dissolution technology is imminent. The intelligent dissolution technology requires precise control based on the dissolution reaction mechanism of uranium concentrate and suitable dissolution conditions. Given the above situation, the study first investigated the main chemical reactions during the nitric acid dissolution of U3O8 by means of experimental measurements and theoretical calculations. The chemical reaction process during dissolution was determined, and the variation trend of the dissolution reaction was elucidated. Furthermore, through experimental comparisons, the effects of key factors such as nitric acid concentration, temperature, and stirring intensity on the dissolution efficiency of U3O8 were investigated. The suitable conditions for nitric acid dissolution of U3O8 were determined, and the dissolution kinetics curve was measured. Finally, by comparing the dissolution performance of U3O8 from different sources, the reliability of the dissolution parameters was verified. Under the conditions of an initial nitric acid concentration of 6 mol/L, temperature of 60 ℃, stirring speed of 200 r/min, and dissolution time of 60 min, the dissolution rate of U3O8 reaches over 98%. The dissolution rules and parameters obtained from the study can serve as a basis for continuous dissolution of uranium oxides such as uranate, uranium peroxide, uranium trioxide, and uranium dioxide.
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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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