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Aiming at the problems of poor heap leaching permeability, low molybdenum leaching rate and difficult solid-liquid separation in stirring leaching of low-grade uranium-molybdenum ore in Guyuan, a process path of "mixing acid curing-low temperature roasting" synergistic enhanced acid heap leaching was proposed, and the key parameters such as acid concentration, curing temperature and time, roasting temperature and time, and spray intensity were optimized under column leaching conditions. Considering the energy consumption and process effect, the recommended conditions are as follows：ore particle size is -1 mm, acid mixing mass fraction is 12%, curing at 90 ℃ for 3 h, roasting at 300 ℃ for 30 min, acidizing water mass concentration is 10 g/L, spray intensity is 76 L/(m2·h). Under these conditions, the leaching rate of molybdenum slag can reach 82.89%, the molybdenum grade of tailings is reduced to 0.038%, and the uranium grade is reduced to 100.33×10-6. The results of multi-batch ore verification test show that the process flow has adaptability to uranium-molybdenum ore with fluctuating grade and property. The molybdenum leaching rate of different low-grade uranium-molybdenum ore is stable at 72.51%–77.37%, which can achieve the process goal. The research results can provide technical support for the efficient extraction of low-grade complex uranium-molybdenum ore 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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