Global Model for Predicting Flotation Efficiencies. Part II: Particle Size and Flotation Rate Predictions, and Experimental Studies and Comparisons, 1994 Recycling Symposium Proceedings

Ronggen Pan, Fritz G. Paulsen, Hatice Kocer, Ridvan Nerez, Donna A. Johnson, Douglas W. Bousfield, Edward V. Thompson

A statistical, global flotation model is described, and discussed in terms of the two input parameters, capture radius and flotation time. Typical results are shown in terms of both capture radius and flotation time. Experimental flotation rate data for laser printed paper is presented, and flotation efficiency is seen to be a strong function of toner particle size. It is shown that for any given particle size, a single capture radius is not adequate for predicting the experimental rate curve. Data is presented showing that after repulping some toner particles are clean, while others retain attached fiber, and that these two types of particles have different flotation properties. An argument is presented for assigning a different capture radius to clean particles vs. particles with retained fibers. Using two capture radiuses for each particle size, excellent agreement is obtained between global model fits and experimental data for both pilot plant data and for two laboratory experiments at different air flow rates.