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Outline
The leaching rate is an important indicator for measuring the in-situ leaching efficiency, it is also an important basis for assessing its technical level. A uranium deposit in Inner Mongolia is mined by acid in-situ leaching process, which is divided into eastern and western mining areas. In recent years, the operation shows that there is a large difference in leaching rate between the eastern and western mining areas, and the leaching rate in the eastern mining area is significantly lower than that in the western mining area. In this paper, the geology, hydrogeological characteristics, mining development technology and operation mode of the eastern and western mining areas of the deposit were systematically analyzed, and the results show that the ore body close to the waterproof floor of the ore-bearing aquifer is more conducive to the leaching of uranium in the ore layer than the "suspended" output. The permeability coefficient of the deposit gradually increases from west to east, and the permeability coefficient of 1 ~ 5 m/d is relatively more conducive to the leaching of uranium in the ore layer than that of 5~10 m/d in the most favorable range of the permeability coefficient of 1 ~10 m/d. Independent acidification was adopted in the western mining area, and the acidity of the leaching agent was increased to 14 m/d, which oxidized U (IV) to U (VI) and placed the ore-bearing aquifer in a favorable chemical environment for uranium leaching, which significantly improved the leaching effect compared with the eastern mining area, which had obvious advantages. The research results can provide a useful reference for the leaching of similar in-situ leaching sandstone-type uranium deposits.
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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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