Effect of Particle Hydrophobicity on the Detachment Mechanism of Flotation Particle-Bubble Vortex Turbulence
Particle hydrophobicity is an important factor affecting flotation recovery.In order to clarify the influence mechanism of particle hydrophobicity on particle-bubble vortex detachment,a self-made flotation particle-bubble confined turbulence detachment test platform was used to explore the detachment behavior of different hydrophobic gas flocs in turbulence vortex.The results show that the gas flocs are captured by vortex after entering the wall cavity,and then undergo rotational centrifugal motion within the wall cavity.The average detachment time of low and high hydrophobic particles in the wall cavity is 0.34 s and 0.59 s,respectively,indicating that high hydrophobic particles can improve the stability of the gas flocs in the vortex.Further research was conducted on the detachment mechanisms of different hydrophobic particles in the vortex.The detachment behavior of particle-bubble gas flocs in the vortex was innovatively divided into fluid shear detachment and particle centrifugal detachment.The detachment of low hydrophobic particles mainly occurs in the central region of the wall cavity,all of which are centrifugal detachment caused by excessive centrifugal force.For high hydrophobic particles,although centrifugal detachment remains the dominant detachment mechanism,there is a 20％probability that the gas flocs will undergo shear detachment at the top of the wall cavity due to strong turbulence stress.
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