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A high-clay low-grade sandstone-type uranium ore, predominantly composed of clay fine sandstone, exhibits significant thickness variations in both the aquifer and aquiclude within the mining area, resulting in poor sand permeability and high groundwater salinity, which render in-situ leaching infeasible. To comprehensively evaluate the leachability of this ore, the applicability of acid/alkaline agitation leaching and column leaching processes was systematically investigated. The results show that under the acid agitation leaching conditions of sulfuric acid dosage of 16%, MnO2 dosage of 1%, liquid volume to solid mass ratio of 1.6∶1-1.8∶1, leaching temperature of 60 ℃, and leaching time of 4 h, the uranium leaching rate reaches 95%. However, when the acid column leaching process is applied, the high carbonate content in the ore causes severe argillization and gas blockage, making the process unstable and difficult to operate. In contrast, under the alkaline agitation leaching conditions with a Na2CO3/NaHCO3dosage of 2.5%, liquid volume to solid mass ratio of 1.0∶1-1.2∶1, temperature of 80 ℃, and leaching time of 16 h, the uranium leaching rate attains 88%. For the alkaline column leaching process, alkali-mixing and curing can maintain the permeability of the ore heap. Nevertheless, the overall leaching rate remains low owing to the poor leaching efficiency of coarse particles. Based on a comprehensive comparison, the alkaline agitation leaching process is recommended for the treatment of this ore, and enhanced pretreatment of coarse particles should be implemented to further improve the uranium leaching rate.
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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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