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Filtering mechanism and effect of many kinds of filters have been systematically studied. Assuming that the particles are spheroid of equal size and arranged in an inclined cube, the initial minimum pore diameters of gravel filter and porcelain granule pre-coated filter are calculated to be 0.310 and 0.155 mm, respectively. Because of the filtration effect, the pore diameter of gravel filter and porcelain granule pre-coated filter gradually decreases with the extension of time, and the filtration effect is good. The diameter of the hole of the filter without gravel and wrapped with mesh is 0.180~0.270 mm, and the diameter is basically the same after assembly, this filter only has the effect of blocking, and the filtering effect is poor. The hole wall of the filter without gravel or with uncompacted filling may collapse or fall out of sand, and there are too many debris in the leaching solution. Mercury injection test shows the maximum pore throat diameter in sandstone uranium deposit is 0.032 mm, and all filters have no barrier effect on unstable silty clay debris and chemical precipitation.
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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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