Entrainment of particles with density between 1.01 and 1.10 g/cm3 in a monobubble Hallimond flotation tube

It was established in this study that the entrainment of low density particles in the monobubble Hallimond flotation cell with densities between 1.01 and 1.10 g/cm(3) obeys the equation: L-L = d(50)((rho(p)-rho(w))/rho(w))(0.75) = 0.0225+/-0.0025 (cm) where d(50) is the size of particles (in cm) for which the recovery due to entrainment is 50%, rho(p) is the density of particle (in g/cm(3)), rho(w) stands for the density of water while L-L is a constant (in cm). Equation (a) is identical with the equation previously found for particles with densities between 1.10 and 2.00 g/cm(3) and obeys Alien's (turbulent-near laminar) mode of freely settling particles in liquid media. Equation (a) is different from the equation for particles with densities greater than 2.0 g/cm(3), for which the mechanical carryover in the Hallimond tube is governed by the Newton-type equation for particles settling turbulently: L-H = d(50)(rho(p)-rho(w))/rho(w) = 0.023+/0.002 (cm) because the power factor for the (rho(p)-rho(p))/rho(w) term is I not 0.75. (C) 1999 Elsevier Science Ltd. All rights reserved.