Full
Outline
The pregnant solution produced by the neutral in-situ leaching uranium process often contains a large amount of fine particles, which can easily lead to problems such as the decrease of ion exchange rate of subsequent ion exchange resins, the decrease of resin adsorption capacity, and frequent cleaning cycles. Aiming at the bottleneck of low removal efficiency and insufficient operation stability of traditional solid-liquid separation technology for fine particles, this study introduced a microchannel separation technology based on the coupling enhancement mechanism of microchannel adhesion separation—oscillation desorption, and carried out field pilot test. The experimental results show that the removal efficiency of particles with particle size >1 μm is higher than 94%, and the removal efficiency of particles with particle size > 5 μm is close to 100%. Under different influent turbidity (6-33 NTU) conditions, the effluent turbidity was stable at 2-9 NTU, and the removal rate was maintained 60%-75%. The operating pressure difference of the system increased slowly with the accumulation of particles. After 8 days of stable operation of the device, the removal efficiency of particles with particle size >1 μm decreased to 70%. In order to restore the separation performance of the system, the device was backwashed. After backwashing, the removal ability of particles with particle size >5 μm was quickly restored. Compared with the conventional bag filter, the particles at the out-let of the microchannel separator are mainly distributed in the sub-micron to micron scale, and the medium and large particle sizes are significantly reduced. This study provides experimental basis and technical support for the engineering application of microchannel separation technology in the pretreatment of pregnant solution of in-situ leaching uranium.
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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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