Flotation de-inking studies using model hydrophobic particles and non-ionic dispersants

Influence of surfactant concentration on the ink removal selectivity in a laboratory flotation column

“…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.…”

Surface chemicals concepts of flotation de-inking

“…In addition to fatty acids, we have recently carried out studies with nonionic co-surfactants such as alcohol ethoxylated surfactants [44]. The result relates the surface tension to the time (at 10 −3 , 10 −4 and 10 −5 M concentrations) for different surfactants.…”

“…The water have been analysed and the results compared with the model experimental systems [44]. The samples of effluent were taken both from the inlet and outlet to the flotation cell and collected during routine flotation operations.…”

“…Therefore, the caustic pulping environment not only promotes the release of larger particles but also reduces the hydrophobicity of the toner particles. Johansson et al [44] has measured the contact angle at two different concentrations for nonionic surfactants. They have seen that the contact angle decrease with increasing chain length at both concentrations.…”

Atomic force microscopy and contact angle studies of polymerizable gemini surfactant admicelles on mica

“…8,9 Surfactant adsorption and adsolubilization behavior are important in a number of applications such as surface modification, detergency, lubrication, corrosion inhibition, and mineral flotation. [10][11][12][13][14][15] Adsolubilization results from aggregation of surfactants at the solid-liquid interface which act as a two-dimensional solvent for organic solutes. 16 The inner or core region of the bilayer structure is a nonpolar region that can facilitate the solubilization of nonpolar solute molecules.…”