Drop attachment behavior of oil droplet-gas bubble interactions during flotation

摘要

Flotation is an efficient pretreatment technology for oily water. In this paper, the attachment process between gas bubbles and oil droplets was investigated both experimentally and theoretically. The attachment process of the oil droplet onto the gas bubble was described in detail. The results show that the spreading of an oil film on the bubble surface precedes the spreading of the entire oil droplet during the spread phase. In the film drainage phase, the induction time increases with decreasing oil spreading coefficient and increasing bubble size and oil viscosity, among which the effect of the oil droplet viscosity is most significant. Moreover, during the spread phase, the oil droplet spreads rapidly on the gas bubble, and the spreading time also increases with decreasing oil spreading coefficient and increasing bubble/droplet size and oil viscosity. (C) 2020 Elsevier Ltd. All rights reserved.