“…collectors, frothers, dispersants, or released by recovered papers are slightly removed during flotation and concentrated in the froth. The surfactant concentration in the pulp progressively decreases as flotation proceeds, thus i) increasing bubble coalescence (Beneventi et al, 2006b;Dorris et al, 2006), ii) reducing froth stability and water recovery (Johansson et al, 2000;Epple et al, 1994), iii) displacing adsorption-desorption equilibriums between surfactants, collectors and dispersed particles (Johansson et al, 2000) and consequently affecting the efficiency of the whole flotation process.…”