Full
Outline
To reveal the particle motion mechanisms and the effects of feed parameters on the moisture distribution within the filter cake, a three-dimensional dynamic filtration numerical model of a plate-and-frame filter press was constructed based on the Eulerian multiphase model and the multi-scale characteristics of coal slime particles. The motion processes of the particle and liquid phases, alongside the particle deposition process, were systematically investigated, and the impacts of coal slime mass fraction and filter chamber thickness on the moisture distribution of the filter cake were analyzed. The results indicate that fine particles (<0.1 mm) are dominated by fluid drag forces. During the initial filtration stage (0-120 s), streamline dispersion and particle bleed-through phenomena occur, forming a dense shell on the filter cloth surface with a volume fraction approaching 80%. Conversely, coarse particles (≥0.1 mm) are primarily governed by gravitational settling, aggregating in the middle and lower sections of the filter chamber to constitute a supporting skeleton. The feed mass fraction of the coal slime significantly impacts the filter cake structure. Under a low feed mass fraction (30%), fine and coarse particles undergo stratification, leading to a "sandwich" moisture accumulation in the middle and upper parts of the filter cake. At a mass fraction of 40%, a uniform particle distribution and efficient dewatering are achieved. When the coal slime mass fraction exceeds 50%, the weakened carrying capacity of the water flow causes particles to settle synchronously, resulting in an overall dense filter cake with dispersed moisture. Furthermore, when the filter chamber thickness exceeds 38 mm, the densification of the outer cake layer combined with insufficient internal drainage pressure collectively induces the "sandwich" phenomenon at the center of the filter cake, which shifts toward the chamber axis as the chamber thickness increases. The findings provide a theoretical basis for optimizing the process parameters of pressure filtration.
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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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