Critical coalescence concentration of inorganic salt solutions

Quinn, J.J.; Sovechles, J.M.; Finch, J.A.; Waters, Kristian E.

doi:10.1016/j.mineng.2013.12.021

Cited by 76 publications

(48 citation statements)

References 27 publications

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“…In the flotation process, frothers are normally employed to inhibit bubble coalescence, stabilize the froth by dispersing air [22], and provide adequate frothing characteristics [23,24]. The presence of inorganic salts leads to more complex bubble coalescence, as inorganic ions-similar to frothers-can stabilize foams against coalescence and reduce bubble size [19,25].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Common Monovalent and Divalent Chlorides on Chalcopyrite Flotation

Xiao

et al. 2017

Minerals

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Much attention has been paid to the flotation of chalcopyrite using saline seawater. However, the influence of salt ions on mineral flotation is complex, and different salts may play various roles-either beneficial or detrimental. This study investigated the effects of common chlorides (Cl − ) of Na + , K + , Mg 2+ , and Ca 2+ in seawater on chalcopyrite floatability. The presence of Na + , K + , and Ca 2+ resulted in greater chalcopyrite recovery, with this effect being more pronounced for the monovalent cations. In contrast, the addition of Mg 2+ resulted in decreased chalcopyrite flotation efficiency. Contact angle measurements showed that the presence of monovalent cations increased the hydrophobicity of the chalcopyrite surface, while the presence of divalent cations reduced its hydrophobicity, depending on the concentration. Zeta potential, pulp species, and X-ray photoelectron spectroscopy (XPS) cross-confirmed the precipitation of Mg(OH) 2 on the chalcopyrite surface when Mg concentration was 10 −2 M and pulp pH was 10.

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Section: Introductionmentioning

confidence: 99%

The Influence of Common Monovalent and Divalent Chlorides on Chalcopyrite Flotation

Xiao

et al. 2017

Minerals

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“…The CCC is a concentration above which bubbles do not coalesce and reach an almost constant bubble size. Quinn et al (2014b) defined CCCX as the concentration at which the bubble size reduces by X% from that in pure water to the constant bubble size at a high salt concentration (Quinn et al, 2014b). The CCCX of salts was determined by fitting the bubbles Sauter mean diameter (D32) and salt concentration (C) data to the following model:…”

Section: Stirred Tankmentioning

confidence: 99%

“…Zieminski (1971) b. Zieminski et al (1976) c. d. Craig et al (1993b) e. f. Tsang et al (2004) g. h. i. Quinn et al (2014b), 1.CCC95 and 2.CCC75 the concentration at which D32 (the Sauter mean diameter) is reduced by 95% and 75% respectively from that in water to D32 as the salt concentration goes to j. Zahradnı́k et al (1999) k. Firouzi and Nguyen (2014a) l. Castro et al (2012) ∞ Table 2.2.…”

Section: Comparison Of Transition Concentrations Of Saltsmentioning

confidence: 99%

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

Firouzi¹

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Bubble coalescence and thin liquid films (TLFs) between bubbles known as foam films, are central to many daily activities, both natural and industrial. They govern a number of important processes such as foam fractionation, oil recovery from tar sands and mineral recovery by flotation using air bubbles. TLFs are known to be stabilized by some salts and bubble coalescence in saline water can be inhibited at salt concentrations above a critical (transition) concentration. However, the mechanisms of the inhibiting effect of these salts are as yet contentious. The aim of this work is to characterise the behaviour of saline liquid films both experimentally and theoretically to better understand the mechanisms.The effect of sodium halide and alkali metal salts including NaF, NaBr, NaI, NaCl, KCl and LiCl on the stability of a foam film was investigated by applying the TLF interferometry method. To mimic realistic conditions of bubble coalescence in separation processes, the drainage and stability of TLFs were studied under non-zero bubble (air-liquid interface) approach speeds (10-300 µm/s) utilizing a nano-pump. For each of the salts studied, a critical concentration (Ccr) above which liquid films lasted for up to 50 s depending on the salt type, concentration and the interface approach speed, was determined. For concentrations below Ccr, the saline liquid films either ruptured instantly or lasted for less than 0.2 s. Ccr follows the order NaF

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“…It has been recognized that use of process water or saline water especially under a turbulent condition can increase flotation recovery and reduce frother dosage (Craig et al, 1993;Li and Somasundaran, 1993;Ozdemir et al, 2009;Castro and Laskowski, 2011;Castro et al, 2013;Quinn et al, 2007Quinn et al, , 2014. For instance, Quinn et al (2007) found that 23,400 ppm (= 0.4 M) NaCl could give a bubble size and a gas hold up similar to those of 10 ppm of MIBC, suggesting the importance of water quality on flotation performance and thus the need to investigate the interactions between frothers and inorganic electrolytes.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

A comparative study of methyl cyclohexanemethanol and methyl isobutyl carbinol as frother for coal flotation

Park

Wang

2016

International Journal of Mineral Processing

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Methyl isobutyl carbinol (MIBC), an aliphatic alcohol, is widely used as a frothing reagent in coal flotation but it has safety concerns owing to its low flash point (approximately 40 °C). In the present work, we studied a cyclic alcohol, methyl cyclohexanemethanol (MCHM) with a high flash point (approximately 110 °C) and compared its coal flotation performance with that of MIBC. A bottom-driven mechanical flotation cell and two coking coals of distinct floatability, namely A and B, were used. Collectorless flotation tests were carried out with process water for coal A. Flotation tests with diesel as collector at 50 ppm were carried out with simulated process water (0.03 M NaCl solution) and highly saline water (0.5 M NaCl solution), respectively, for coal B. The flotation results showed that MCHM was an effective alternative to MIBC. The highly saline water produced sufficient frothing, obviating the necessity of adding MIBC or MCHM. To understand the effect of frother type and concentration and NaCl concentration on the coal flotation performance, we conducted surface tension measurement for the frother solutions, characterised the dispersion of air near bubble sparger, and measured the stabilities of froth, foam, and foam film. It was found that MCHM was more surface active and more capable of stabilizing froth and foam than MIBC.Foam film stability measured at a broad range of interface approach velocity followed a bellshaped trend and at a given NaCl concentration, the observed peak foam film stability of 15 ppm MCHM was higher than that of 15 ppm MIBC. Increasing NaCl concentration from 0.03 M to 0.5 M had the effect of stabilizing the froth and foam but destabilising the thin foam film.

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Critical coalescence concentration of inorganic salt solutions

Cited by 76 publications

References 27 publications

The Influence of Common Monovalent and Divalent Chlorides on Chalcopyrite Flotation

The Influence of Common Monovalent and Divalent Chlorides on Chalcopyrite Flotation

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

A comparative study of methyl cyclohexanemethanol and methyl isobutyl carbinol as frother for coal flotation

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