Collision of a rising bubble–particle aggregate with a gas–liquid interface

In this paper we investigate the hypothesis that when bubbles carrying attached hydrophobic particles arrive at an air–liquid interface, the abrupt change in velocity is sufficient to dislodge attached particles, which fall back into the liquid. For the first time, experiments have demonstrated a ca...

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Bibliographic Details
Published in:International journal of mineral processing 2014-07, Vol.130, p.1-7
Main Authors: Ireland, Peter M., Jameson, Graeme J.
Format: Article
Language:English
Subjects:
Aggregates
Bubble
Bubbles
Detaching
Dissipation
Flotation
Kinetic energy
Liquids
Mineral processing
Particles
Pulsation
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Summary:In this paper we investigate the hypothesis that when bubbles carrying attached hydrophobic particles arrive at an air–liquid interface, the abrupt change in velocity is sufficient to dislodge attached particles, which fall back into the liquid. For the first time, experiments have demonstrated a case in which the particles do not detach, but move smoothly over the surface of the bubbles. The kinetic energy of arrival is dissipated by the motion of the particles through the liquid, as they move over the surface of the bubble while remaining attached. Some energy is also dissipated by the pulsations of the bubbles. The pulsations themselves do not lead to detachment of particles. A theory has been developed to explain the observed phenomena. [Display omitted] •We investigate collision of bubble–particle aggregates with an air–liquid interface.•It has previously been hypothesised that this can break up the aggregates.•In our experiments, particle detachment did not occur.•Particles moved up around the bubble surface while remaining attached.•The bubble–particle forces were modeled.
ISSN:0301-7516
1879-3525
DOI:10.1016/j.minpro.2014.05.002