The Dynamics of Bubble/Particle Attachment and the Application of Two Disjoining Film Rupture Models to Flotation (original) (raw)
1996, Journal of Colloid and Interface Science
parameters; and (3) theoretical and model descriptions of A model of disjoining film rupture is presented in the context the overall process. These three points are obviously interof bubble/particle flotation with viscous, surface tension, Londonconnected, and any successful model must clearly contain van der Waals dispersion, and hydrophobic attraction forces conaccurate mechanistic descriptions of both the hydrodynamics sidered. Evolution equations are derived for three types of boundand the physicochemical makeup of the system in question. ary conditions: (1) free bubble surface, (2) tangentially immobile Our work is in the area of paper recycling, particularly bubble surface, and (3) nonconstant surface tension. Examples the so-called ''mixed office waste'' stream which contains, are shown where the film disjoins (stabilizes) and where the film along with the wood fibers to be recovered and recycled, a drains and ruptures. A critical film height is related to the interacwide variety of polymeric contaminants including thermotion parameters and the characteristic perturbation wavelength. Film rupture times are calculated in terms of both the magnitude plastic toner particles resulting from photocopied and laserof the hydrophobic attraction and the characteristic wavelength. printed paper, adhesive-based particles (so-called ''stick-An argument is given for associating the characteristic wavelength ies'') derived from pressure-sensitive labels and glues, and with particle dimension: the model predicts particles of intermedilatex-based plastics resulting from glossy paper coatings. A ate sizes are preferentially floated, as observed in many flotation major challenge of paper recycling is the separation of these systems.
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