Study on particle fluidization characteristics and separation effect of coarse slime fluidized flotation

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 1.0-0.5 mm 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 bub