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The air-density fluidized bed drying and sorting integration experiment system was used to conduct the separation experiment on wet coal. The effects of surface water of coal, drying temperature, drying time, air volume and other factors on separation precision and separation density were investigated. A mathematical correlation model of separation precision and separation density with various influencing factors was established. Studies have shown that the drying temperature and surface water of coal have a significant influence on the separation precision; the increase of drying temperature can improve the separation effect and increase the separation density, the increase of surface water of coal leads to the decrease of separation precision and the decrease of separation density. The increase of drying time contributes to the removal of surface water of coal, which makes the separation precision increase and the separation density increase; As the air volume increases, the separation precision first increases and then decreases, and the separation density decreases first and then increases slightly.

Flocculation sedimentation test was carried out on the coal slurry of the selected coal preparation plant. A mathematical correlation model of initial settling velocity, upper clarification turbidity and sediment volume with various influencing factors was established. The results show that: the initial settling velocity increases first and then decreases with the increase of flocculant concentration; when the flocculant concentration is 10g/m3, the initial settling velocity is the largest; the initial settling velocity increases with the increase of the mass ratio of coagulant and flocculant. The upper clarification turbidity decreases first and then increases with the increase of the flocculant concentration; when the flocculant concentration is 10g/m3, the supernatant has the lowest turbidity; the upper clarification turbidity decreases with the increase of the mass ratio of coagulant and flocculant. The volume of sediment increases with the increase of flocculant concentration, and increases with the increase of mass ratio of coagulant and flocculant.