A theoretical model of flotation deinking efficiency

[摘要] The associated probabilities of each microprocess occurring in flotation deinking are employed in the development of a kinetic or population balance-type model of the overall flotation process. The overall model contains two kinetic constants: The first, k(1), governs the overall probability of a free ink particle successfully being intercepted by and adhering to an air bubble; the second, k(2), is a measure of the probability that a particle/bubble aggregate pair will become unstable and split to yield a ''new'' free ink particle. The solution to the kinetic model is presented in terms of k(1); and k(2), which are themselves functions of system parameters such as bubble and particle physical properties (e.g., diameter, density) and fluid properties (e.g., viscosity, surface tension). From this solution, a definition of theoretical flotation efficiency is presented, as well as definitions of other system performance parameters, and selected predictions are displayed. (C) 1997 Academic Press.

[发布日期] 1997-06-01

[关键词] flotation deinking;kinetic model;probability of adhesion;probability of detachment;sliding;three-phase contact;disjoining film;critical film thickness;collision frequency;turbulent energy density