Effect of particle hydrophobicity on particle and water transport across a flotation froth

Schwarz, S and Grano, S (2005) Effect of particle hydrophobicity on particle and water transport across a flotation froth. Colloids And Surfaces A-physicochemical And Engineering Aspects, 256 2-3: 157-164.


Author Schwarz, S
Grano, S
Title Effect of particle hydrophobicity on particle and water transport across a flotation froth
Journal name Colloids And Surfaces A-physicochemical And Engineering Aspects  (ERA 2012 Listed)    (ERA 2010 Rank B)   Check publisher's open access policy
Publication date 2005
Sub-type Article
DOI 10.1016/j.colsurfa.2005.01.010
Volume number 256
Issue number 2-3
ISSN 0927-7757
Start page 157
End page 164
Total pages 8
Editor N. Furlong
D.C. Prieve et.al.
Place of publication Amsterdam, Netherlands
Publisher Elsevier Science BV
Collection year 2005
Language eng
Subject C1
290702 Mineral Processing
640300 First Stage Treatment of Ores and Minerals
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. (c) 2005 Elsevier B.V. All rights reserved.
Keyword Chemistry, Physical
Flotation
Froths
Frothers
Froth Stability
Contact Angle
Coalescence
Foam Drainage Equation
Zone Recovery
Destabilization
Solids
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Wed, 15 Aug 2007, 05:28:52 EST