On the effect of van der Waals attractions on the critical salt concentration for inhibiting bubble coalescence

Firouzi, Mahshid and Nguyen, Anh V. (2014) On the effect of van der Waals attractions on the critical salt concentration for inhibiting bubble coalescence. Minerals Engineering, 58 108-112. doi:10.1016/j.mineng.2014.01.014


Author Firouzi, Mahshid
Nguyen, Anh V.
Title On the effect of van der Waals attractions on the critical salt concentration for inhibiting bubble coalescence
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
1872-9444
Publication date 2014-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.mineng.2014.01.014
Open Access Status Not Open Access
Volume 58
Start page 108
End page 112
Total pages 5
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Language eng
Subject 1909 Geotechnical Engineering and Engineering Geology
2210 Mechanical Engineering
1600 Chemistry
2207 Control and Systems Engineering
Abstract The coalescence of gas bubbles in many salt solutions such as NaCl is significantly inhibited if the salt concentration exceeds a critical concentration which is unique for each salt. It has been predicted as a function of the Hamaker constants of van der Waals attractions between two bubbles. In this paper, the Lifshitz theory on the van der Waals interaction energy and the available spectrum for water dielectric permittivity are applied to determine the Hamaker constants for liquid films between bubbles in pure water and salt solutions. Using the new values for Hamaker constants for thin films of saline solutions, we show that the effect of van der Waals attractions on the critical salt concentration is significantly weaker than previously hypothesized. The predictions based on van der Waals attractions significantly under-estimate the experimental critical concentrations. The failure of the van der Waals attraction in predicting the critical salt concentration highlights the urgent need of revising the available theories on bubble coalescence in salt solutions and saline water.
Keyword Bubble coalescence
Flotation
Hamaker constants
Saline water
van der Waals attractions
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID DP0985079
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2015 Collection
 
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