Issue 2, 2004
From the journal:

Physical Chemistry Chemical Physics

Influence of dewetting kinetics on bubble–particle interaction

Anh V. Nguyena  and  Hajo Stechemesserb  

a Discipline of Chemical Engineering, School of Engineering, The University of Newcastle, Callaghan NSW, Australia
E-mail: Anh.Nguyen@newcastle.edu.au
Fax: (61 2) 4921 6920
Tel: (61 2) 4921 6189

b Max Planck Group for Colloids and Interfaces, Freiberg University of Mining and Technology, Chemnitzer Str. 40, Freiberg, Germany
E-mail: steme@mpikgf.tu-freiberg.de
Fax: (41 3731) 797 408
Tel: (41 3731) 797 408

Abstract

Bubble–particle dewetting kinetics relevant to froth flotation was experimentally studied on a modelled system using a CCD high-speed video microscopy. The experimental system included a gas–liquid interface formed at the bottom of a glass capillary filled with either deionized Milli-Q water or a solution of dodecylamine chloride (DAC) and hydrophobic glass beads dropping onto the interface in the solution inside the capillary under gravity. The dewetting process was observed underside the gas–liquid interface with a metallographic inverted microscope and a CCD high-speed video system operating at about 1000 frames s−1 for imaging the dewetting process. The velocities of the dewetting process showed a maximum in the pH-domain where the flotation recovery also showed a maximum. This good correlation between the dewetting kinetics and flotation recovery indicates that the dewetting kinetics is equally necessary as the thinning and rupture of the intervening liquid film between bubbles and particles for success of the flotation process. The discussion highlighted the need of developing a better understanding of the particle–bubble contact interaction, in particular, the difference in contact angles on micron-sized particles and flat surfaces.

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Article information

DOI
https://doi.org/10.1039/B312073B
Article type
Paper
Submitted
29 Sep 2003
Accepted
01 Dec 2003
First published
16 Dec 2003

Phys. Chem. Chem. Phys., 2004,6, 429-433

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Influence of dewetting kinetics on bubble–particle interaction

A. V. Nguyen and H. Stechemesser, Phys. Chem. Chem. Phys., 2004, 6, 429 DOI: 10.1039/B312073B

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