Surface Active Agent Phenomena in Dust Abatement

Characterization of the Wetting and Dewetting Behavior of Powders

“…A variation of this test is to measure the concentration of a surfactant required to give a 'sink time' of 25 seconds. The procedure was later modified by Walker et al 31) to determine the wetting ability of various surfactants for coal dusts. In this technique coal particles were dropped individually onto the surface of surfactant solutions of progressively dilute concentrations.…”

Variation of critical surface tension for wetting of minerals with roughness determined by Surtronic 3+ instrument

“…Several other techniques are also available for determining the c c values, such as flotation, immersion time, bubble pickup, film flotation, automatic wetting balance and modified Hildebrand -Scott equation methods (Williams and Fuerstenau, 1987;Zisman, 1964;Rosano et al, 1971;Sun and Troxell, 1957;Walker et al, 1952;Wu, 1968).…”

Flotation and flocculation chemistry of coal and oxidized coals

“…One such technique involves the rate at which a powder transfers from a gaseous phase into a liquid phase. In an investigation of the action of surface active agents in coal dust abatement, Walker et al [24] studied wettability by determining the surface tension of the solution into which individual particle, would be imbibed immediately when dropped from a height of one centimetc,. Another variation of their experiment involved dropping 100 #m particles onto the surface of solutions of wetting agents, and taking the time for the particles to disappear from the liquid surface as the time of wetting.…”