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Outline
Thickening and dewatering of tailings is a key link in the tailings filling process. In order to explore the thickening and dewatering performance of tailings in a mine, static and dynamic flocculation settlement tests of tailings were carried out according to the basic physicochemical properties of tailings. The static flocculation settlement tests were designed with the mass concentration of tailings slurry, the flocculant type and the flocculant content as the influencing factors and the settlement rate as the research index. The dynamic flocculation settlement tests were designed with feed rate, feed mass concentration and flocculant content as influencing factors, and solid content of overflow water, underflow mass concentration and settling velocity of tailings as research indexes. Based on response surface analysis method, the dynamic flocculation settlement law of total tailings under the interaction of multiple factors was revealed. Firstly, through the static flocculation settlement tests, the optimal type of flocculant was determined as CKFA02, the optimal content of flocculant was determined as 20 g/t, and the optimal feed mass concentration of tailings slurry was determined as 10%−12.5%. Secondly, according to the response surface model constructed based on the dynamic flocculation settlement tests, the maximum influencing factors on the underflow mass concentration, solid content of overflow water, and settling velocity of tailings are the slurry feed rate. The interaction between slurry feed rate and feed mass concentration has the greatest impact on the underflow mass concentration, while the interaction between slurry feed rate and flocculant content has the greatest impact on the solid content of overflow water and settling velocity of tailings. Thirdly, the optimal settlement parameters are the slurry feed rate of 0.55 t/(m2·h), feed mass concentration of 11.12%, flocculant content of 30 g/t. Under the optimal flocculation settlement parameters, the underflow mass concentration is 60.6%, the solid content of overflow water is 251.4 mg/L, and the settling velocity of tailings is 58.06 mm/s.
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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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