气液固流态化浮选新技术基于重浮耦合原理可实现粗颗粒高效回收，以1.0～0.5 mm粗煤泥为研究对象，系统探究了水速、充气量、捕收剂和起泡剂用量等因素对实验室二维流态化浮选床层流化特性和分选效果的影响。结果表明：增加水速、降低充气量及添加起泡剂和捕收剂均可有效降低压力信号波动，增加床层稳定性。降低充气量可以减小气体在床层内部的表观气速，而水速的增加和起泡剂的添加会通过流体的剪切效果和表面张力的降低使气泡尺寸减小，捕收剂的添加则有助于气泡与颗粒的黏附，降低气泡的上浮速度。随水速和充气量的增加，精煤灰分呈现先减小后增加的趋势，但尾煤灰分趋势略有不同，过高的充气量会扰乱床层导致返混严重，尾煤灰分增加；捕收剂和起泡剂的适当加入会进一步降低精煤灰分，这是由于浮选气泡在粗颗粒表面的黏附，降低了其表观密度，强化了按密度分选效果，但是过量的药剂加入可能会导致浮选夹带现象的出现，增加精煤灰分。最后研发了直径200 mm流态化浮选设备用于半工业试验，以 1.0～0.25 mm粗煤泥为入料，在水速为15 L/min、充气量为1.5 L/min、捕收剂200 g/t和起泡剂400 g/t条件下可获得最佳分选指标，精煤灰分和产率分别为9.34%和90.13%，尾煤灰分和产率分别为38.51%和9.87%。本研究对实现流态化浮选过程床层稳定性调控及粗煤泥高效回收利用具有重要意义。

The new gas-liquid-solid fluidized bed flotation technology can realize the efficiency recovery of coarse particles based on the principle of refloating coupling. Taking 1.0-0.5mm coarse coal slime as the research object, the effects of water velocity, inflating gas flow, concentration of collector and frother on the fluidization characteristics and separation effect of two-dimensional fluidized-bed in the laboratory were systematically investigated. The results show that the fluctuation of pressure signal can be effectively reduced and the stability of fluidized-bed can be improved by increasing the water velocity, reducing the inflating gas flow and adding frother and collector. Reducing the inflating gas flow can reduce the apparent gas velocity of the fluidized-bed, while increasing the water velocity and adding the frother will reduce the bubble size through the shear effect of the upflowing fluid and the reduction of the surface tension, and the adding of the collector will make the adhesion of the bubble to the particles and reduce the floating speed of the bubble. With the increase of water velocity and inflating gas flow, the ash content of concentrate first decreases and then increases, but the tailling ash content has a slightly different trend. Too high inflating gas flow will disturb the fluidized-bed and lead to serious mixing, then the tailling ash content will increase. The appropriate addition of collector and frother will further reduce the ash content of concentrate, which is due to the adhesion of flotation bubbles on the surface of coarse particles, reducing its apparent density and strengthening the density separation effect. However, excessive addition of agents may lead to the occurrence of flotation entrainment and increase the ash content of concentrate. Finally, a semi-industrial test of fluidized bed flotation with a diameter of 200mm was carried out, and the best separation index was obtained with 1.0-0.25mm coarse slime as feed at water velocity of 15L/min, inflating gas flow of 1.5L /min, collector of 200g/t and frother of 400g/t. Ash content and yield of concentrate were 9.34% and 90.13%, and tailling ash content and yield were 38.51% and 9.87%, respectively. This study is of great significance for the realization of fluidized-bed stability control and efficient recovery of coarse slime in fluidized bed flotation process.