Microflotation Suppression and Enhancement Caused by Particle/Bubble Electrostatic Interaction

Journal of Colloid and Interface Science
N A MishchukS S Dukhin

Abstract

The processes of attachment and detachment of small or medium-sized particles to relatively large bubbles during microflotation are considered in terms of the heterocoagulation theory. Calculations are made for the conditions that the surface potentials are of similar sign and constant, that one of the surface potentials is small, that hydrophobic attraction is absent, and that there are no surface deformations. Under these conditions bubble-particle aggregates may form as a result of an electrostatic attraction which exceeds the repulsive van der Waals force at intermediate distances. Next to electrostatic and van der Waals forces, hydrodynamic and gravitational forces are considered. These forces may overcome the electrostatic repulsion at large distances and promote particle bubble attachment. Strong electrostatic attraction at small distances, arising at a large difference of the surface potentials of the bubble and the particle and of low electrolyte concentrations, can prevent subsequent detachment by hydrodynamic and gravitational forces. With increasing electrolyte concentration the electrostatic barrier increases and the attractive electrostatic force diminishes. As a result, a critical electrolyte concentration for mi...Continue Reading

Citations

Oct 4, 2012·Journal of Colloid and Interface Science·S UddinJ A Finch
Sep 2, 2011·Advances in Colloid and Interface Science·Luke Parkinson, John Ralston
Jul 15, 2011·Advances in Colloid and Interface Science·Nataliya A Mishchuk
Nov 26, 2015·Advances in Colloid and Interface Science·Sajjad AghazadehMahdi Gharabaghi
May 27, 2006·Journal of Colloid and Interface Science·N MishchukD Fornasiero
Jun 5, 2007·Advances in Colloid and Interface Science·A S DukhinP J Goetz
Jul 25, 2012·Advances in Colloid and Interface Science·N MishchukD Fornasiero
Jun 7, 2005·Advances in Colloid and Interface Science·Stanislav DukhinQun Yu
Jul 29, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Rada A Pushkarova, Roger G Horn

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