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Aiming at the issues of prolonged leaching cycles and low efficiency in the existing heap leaching process at a uranium mine, an on-site industrial optimization heap leaching test was conducted on fine-grained ore. The optimal process conditions and key parameters of key stages, including ore crushing, wet granulation, and spray heap leaching, on uranium extraction were systematically investigated. The results demonstrate that the closed-circuit crushing and screening process effectively regulates the feed particle size to below 4 mm. Excellent pelletisation is achieved under the conditions of drum granulator speed of 30 r/min and ore feed rate of 40 t/h. Heap leaching tests confirm that this optimised process successfully reduces the uranium from 0.158% to 0.011 5%, achieving the uranium leaching rate of 92.72%, under the conditions of liquid volume to solid mass ratio of 4.86∶1, sulfuric acid consumption of 8.56%, and spray cycle of 78 d.
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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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