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Mastering the particle size in the solution throughout the neutral in-situ leaching process has guiding significance for regulating the leaching process, optimizing filters, determining the position of solid removal, alleviating ore bed blockage, restoring the flow rate of injection liquid, and reducing resin bed stratification. For this purpose, the whole process solution of neutral in-situ leaching of uranium from the Nalinggou deposit in Inner Mongolia was taken as the object, and based on laser particle size analyzer test data, the particle size distribution in the solution was obtained. The results show that the frequency distribution curve of particle size in the leaching solution is asymmetric, and the cumulative distribution curve is in an “S” pattern. The particle size distribution range is narrow, and the maximum particle size is less than 100 μm. The resin bed layer has a strong filtering effect on particulate matter, and the accuracy of the tail liquid filter bag should be determined based on the size of the resin ball and system pressure. The addition of O2 or CO2 in neutral systems has a weak effect on particle size. The particle size frequency distribution curves of both the qualified solution and the masterbatch solution in the settling tank exhibit a “double peak” pattern, while the lean solution exhibits a normal distribution. The maximum particle size in the mother liquor is about 40 μm. It is recommended to choose a precision of 10~50 μm for the leaching solution bag filter, and simultaneously add a 10~20 μm precision filter between the mother liquor tank and the eluent preparation tank. This study reveals the particle size distribution pattern in the whole process solution of the Nalinggou deposit, enriching the understanding of the particle size of neutral in-situ leaching of uranium, and providing a basis for optimizing surface filtration technology in mines.
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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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