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Outline
Pressurization serves as a critical approach for regulating reaction rate in hydrometallurgical processes. To investigate the effects of pressure conditions on uranium leaching performance, laboratory-scale simulated heap leaching tests of uranium ore were carried out using a self-made room-temperature pressurized leaching device, with hard-rock type uranium ore from a mine in southern China as the research material. The results indicate that room-temperature pressurized leaching can accelerates the leaching reaction rate, yet it exerts no positive effect on improving the final uranium leaching rate. Pressurization exhibits a significant promoting effect on uranium leaching before the uranium leaching rate reaches 60%, and the leaching performance is optimal under a pressure of 40 kPa when the uranium leaching rate is below 85%. After 15 days of pressurized leaching, the highest uranium leaching rate reaches 94.66%, while the lowest is 85.90%. This study reveals that based on the correlation between pressure and leaching performance during room-temperature pressurized leaching, the uranium heap leaching technology can be effectively optimized by regulating pressure—a physical parameter with the advantages of controllability and low cost—thereby achieving the high-efficiency recovery of uranium resources.
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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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