Abstract
In research on the particle–bubble collision process, due to the adsorption of surfactants and impurities (such as mineral particles, slime, etc.), most studies consider the bubble surface environment to be immobile. However, in the real situation of froth flotation, the nature of the bubble surface (degree of slip) is unknown. Mobile surface bubbles increase the critical thickness of the hydration film rupture between particles and bubbles, and enhance the collision between particles and bubbles. Sam (1996) showed that when the diameter of the bubble is large enough, a part of the surface of the bubble can be transformed into a mobile state. When the bubble rises in a surfactant solution, the surface pollutants are swept to the end of the bubble, so when the bubble reaches terminal velocity, the upper surface of the bubble is changed into a mobile surface. This paper analyzes the collision efficiency and fluid flow pattern of bubbles with mobile and immobile surfaces, and expounds the influence of surface properties on collision efficiency.
Highlights
A better understanding of controlling factors in mineral flotation is possible using advanced computational fluid dynamics (CFD) simulations of entire full-scale industrial cells
The Generalized Sutherland Equation (GSE) model takes into account the centrifugal inertia effect, comparisons with computational fluid dynamics simulation results showed that it overestimates this effect
The conclusions of this paper are contrary to previous conclusions, which argue that the GSE model is more accurate
Summary
A better understanding of controlling factors in mineral flotation is possible using advanced computational fluid dynamics (CFD) simulations of entire full-scale industrial cells. Identification of each model is outlined with regard to the bubble surface mobility, fluid flow, and those sub-processes involved (i.e., interceptional, gravitational, and inertial effects) in Table 1 [6] It is not applicable for fine particles due to neglecting particle interceptional effect. This study is of importance, first, because Li et al [7] identified differences between published theoretical correlations for collision efficiency and predictions from their CFD model, which attempted to replicate the idealized arrangement treated by the theories. It is of interest, to determine whether near-bubble hydrodynamic effects have any further influence on the predictions. The effects at these distances are not so apparent in the experimentally observed trajectories
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