Particle–bubble interaction and attachment in flotation

An acoustic technique for measurement of bubble solids mass loading – (a) Fundamental study of single bubble

“…The capillary is bent in an L-shape so that the tip of the capillary is horizontally orientated. A particle dropping technique (Nguyen and Schulze, 2004;Verrelli et al, 2011;Wang et al, 2003) is adopted in the present work to load the treated glass microspheres onto the stationary bubble. The current experiment setup emulates a feature in a real flotation system, i.e., particles loading begins from the underside of the bubble.…”

Variations in the induction period for particle–bubble attachment

“…Experiments carried out by several workers have reproduced this manner of interaction in a controlled environment so as to be able to estimate sliding durations (Bogdanov and Filanovsky, 1940;Gottschalk, 1981a, 1981b;Schulze, 1992;Wang et al, 2003), particle trajectories and velocities (Flint and Howarth, 1971;Gottschalk, 1981a, 1981b;Wang et al, 2003;Nguyen and Evans, 2004b;Verrelli and Koh, 2010;Verrelli et al, 2011), attachment efficiencies (Wang et al, 2003), and induction times (Verrelli and Koh, 2010;Verrelli et al, 2011) by direct observation.…”

“…1; the pathlines shown in this figure are purely schematic. Actual particle pathlines are presented in our previous publications (Verrelli and Koh, 2010;Verrelli et al, 2011).…”

Visualization of Angular Particle-Bubble Surface Interaction using a High Speed Video Camera

“…Schulze (1999) showed the mechanism of attachment of particles to the surface of the bubble and the determining parameters. This was also investigated by Verrelli et al (2011). Further research in the field of sliding particles on the surface of the bubble has been done by Nguyen and Evans (2004), Koh et al (2009), Verrelli et al (2015, Lecrivain et al (2015), Wang et al (2015), and others.…”

“…Nevertheless, some important physical phenomena have not received enough attention. Recent research shows that the stages of bubble-particle interaction can be described in a sub-mechanism, such as collision angle, collision radius, sliding, rolling, induction period, and detachment (Nguyen & Evans, 2004;Xu et al, 2011;Verrelli et al, 2011). The submechanism is a constituent stage of bubble-particle interactions which is likely to be a determinant of the efficiency and effectiveness of particle-bubble interaction.…”