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In order to solve the issue of low automation in the hydrometallurgical process in in-situ leaching of uranium, especially in the preparation of yellowcake from precipitation slurry using plate and frame filter presses, a horizontal belt vacuum filter was selected for the first time in an in-situ leaching of uranium mine to conduct a filtration dewatering experiment on sodium diuranate precipitation slurry. The influence of different operating conditions on moisture content of yellow cake products was investigated. The results show that under the conditions of a filtration vacuum of -0.06~-0.08 MPa, a filter cloth precision of 38 μm, a slurry residence time of 640 s, a feed flow rate of 353~589 kg/h, and a backwash and sealing circulation water flowrate of 10 m3/h, the entire process from cloth feeding to filtration, dewatering, cake discharge, and cloth backwashing can be automatically cycled and run continuously and stably. The product moisture content meets the first-grade standard, satisfying the dewatering capacity requirements for a mine producing about 500 t of metallic uranium per year. The technical feasibility of using belt vacuum filter to dehydrate the precipitated slurry has been preliminatively confirmed. The technical feasibility of using belt vacuum filter for dewatering the precipitation slurry has been preliminatively confirmed. The filtration dewatering process can reduce the labor intensity of operators, reduce the radiation hazard, and improve the automation of the entire hydrometallurgy process, it has value for promotion and application.
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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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