Understanding the role of ion interactions in soluble salt flotation with alkylammonium and alkylsulfate collectors

Effects of Surfactants on the Removal of Carbonaceous Matter and Dioxins from Weathered Incineration Fly Ash

“…In this study, differences between the types of surfactants were small, which is inconsistent with the results reported by Qu et al (2014) and Zhou et al (2017). This might be because the high salt concentration in the slurry was attributable to the dissolution of chlorides in MWI fly ash, which increased the surface tension of the aqueous solution (Ozdemir et al, 2011 tension of surfactants might be beneficial for the improvement of bubble adhesion and the spreading of the oily collector (Qu et al, 2014). Tween 80 provides the highest reduction of surface tension and may be more readily adsorbed on the UC surface, which can further improve performance in decarburization flotation.…”

Drainage and stability of foam films during bubble coalescence in aqueous salt solutions

“…The above-described classification of ions helps explain many experimental results if they are considered as a pair of salt ions. This concept is known as Collins' concept of matching water affinities of salt ions (Collins and Washabaugh, 1985;Ozdemir et al, 2011). The concept generally aligns with the observations concerning the effect of salts on bubble coalescence, but not for all salts.…”

“…There are few papers devoted to the effect of approach velocity between bubbles (interface approach speed), compared to other effective factors, such as surfactant and salt types and concentrations . It is reported in the literature that there is little experimental information on the behaviour of single (foam) films between two bubbles in the presence of different salts at different interface approach speeds Ozdemir et al, 2011). Moreover, the focus of the majority of the available literature is on either the concentration or type of salts at (unquantified and unknown) interface approach speeds Lessard and Zieminski, 1971a), or on the air-solution interface approach speeds but with a single salt (mainly NaCl) Wang and Qu, 2012;.…”

“…The effect of inorganic salts on bubble coalescence, froth stability and flotation performance is well known and documented (Klassen and Mokrousov, 1963;Laskowski, 2001;Ozdemir et al, 2011;. Bubble coalescence in many salt solutions and saline water can be inhibited if the salt concentration exceeds a concentration, called the transition concentration .…”

“…All of the mentioned mechanisms have been argued and challenged alongside with the research into the so-called ion-specific effect on bubble coalescence which is strongly believed to be related to the effect of ions on water structure and hydrogen-bonding network (Henry and Craig, 2010;Ozdemir et al, 2011). Many of the discussions remain qualitative rather than quantitative, but there are at least two models for predicting the critical or transition salt concentration for inhibiting bubble coalescence which are based on attractive van der Waals forces.…”