Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/65013
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Type: Journal article
Title: Effect of particle hydrophobicity on particle and water transport across a flotation froth
Author: Schwarz, S.
Grano, S.
Citation: Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2005; 256(2-3):157-164
Publisher: Elsevier Science BV
Issue Date: 2005
ISSN: 0927-7757
Statement of
Responsibility: 
S. Schwarz, S. Grano
Abstract: Froth recovery measurements have been conducted in both the presence (three-phase froth) and absence (two-phase froth) of particles of different contact angles in a specially modified laboratory flotation column. Increasing the particle hydrophobicity increased the flow rate of particles entering the froth, while the recovery of particles across the froth phase itself also increased for particle contact angles to 63° and at all vertical heights of the froth column. However, a further increase in the contact angle to 69° resulted in lower particle recovery across the froth phase. The reduced froth recovery for particles of 69° contact angle was linked to significant bubble coalescence within the froth phase. The reduced froth recovery occurred uniformly across the entire particle size range, and was, presumably, a result of particle detachment from coalescing bubbles. Water flow rates across the froth phase also varied with particle contact angle. The general trend was a decrease in the concentrate flow rate of water with increasing particle contact angle. An inverse relationship between water flow rate and bubble radius was also observed, possibly allowing prediction of water flow rate from bubble size measurements in the froth. Comparison of the froth structure, defined by bubble size, gas hold-up and bubble layer thickness, for two- and three-phase froths, at the same frother concentration, showed there was a relationship between water flow rate and froth structure. © 2005 Elsevier B.V. All rights reserved.
Keywords: Flotation
Froths
Frothers
Froth stability
Contact angle
Coalescence
Rights: © 2005 Elsevier B.V. All rights reserved.
DOI: 10.1016/j.colsurfa.2005.01.010
Published version: http://dx.doi.org/10.1016/j.colsurfa.2005.01.010
Appears in Collections:Aurora harvest
Geology & Geophysics publications

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