Journal
INTERNATIONAL JOURNAL OF MINERAL PROCESSING
Volume 85, Issue 4, Pages 101-110Publisher
ELSEVIER
DOI: 10.1016/j.minpro.2007.08.009
Keywords
surface force; Gibbs elasticity; frother; foam stability; flotation; hydrophobic force; MIBC; PPG-400
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The thin film pressure balance (TFPB) technique was used to determine the surface forces in foam films stabilized with flotation frothers such as n-pentanot, n-octanol, methyl isobutyl carbinol (MIBC), and polypropylene glycol (PPG). The results were compared with the foam stabilities measured experimentally and the film elasticities calculated using a model developed by Wang and Yoon [Wang, L., Yoon, R.-H., 2006a. Role of hydrophobic force in the thinning of foam films containing a nonionic surfactant. Colloids Surfaces A: Physicochem. Eng. Aspects, 282-283, 84-91.]. It was found that foam stabilities are controlled by both film elasticity and disjoining pressure, the relative contributions from each changing with frother type and concentration. At relatively low concentrations, firother dampens the hydrophobic force, an attractive component of the disjoining pressure, that destabilizes foams. At higher concentrations, elasticity plays a more important role in stabilizing foams. (C) 2007 Elsevier B.V. All rights reserved.
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