Correspondence of bubble size and frother partitioning in flotation

Zhang, Wei; Nesset, Jan E.; Finch, J.A.

doi:10.1007/s11771-014-2191-1

Cited by 5 publications

(6 citation statements)

References 22 publications

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“…The critical coalescence concentration (CCC) is another essential parameter for assessing surfactants and signifies the minimal concentration of a surfactant (i.e., frother) needed to avoid bubble coalescence during flotation 66 . Zhang et al 67 have observed that low bulk surfactant concentrations (below the CCC, which was lower than the CMC) have the most significant impact on bubble size reduction. This phenomenon can be explained by partitioning: the surfactant accumulates on the bubble surface, creating a "dry" froth with minimal water entrainment 67 .…”

Section: Resultsmentioning

confidence: 99%

“…Zhang et al 67 have observed that low bulk surfactant concentrations (below the CCC, which was lower than the CMC) have the most significant impact on bubble size reduction. This phenomenon can be explained by partitioning: the surfactant accumulates on the bubble surface, creating a "dry" froth with minimal water entrainment 67 . Partitioning, in this context, refers to the increased concentration of the surfactant in the froth compared to the bulk solution 67 .…”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon can be explained by partitioning: the surfactant accumulates on the bubble surface, creating a "dry" froth with minimal water entrainment 67 . Partitioning, in this context, refers to the increased concentration of the surfactant in the froth compared to the bulk solution 67 . This concentration gradient of the surfactant (C Interface /C Bulk ) between the bulk solution and the bubble interface acts as the primary driving force for reducing bubble size.…”

Section: Resultsmentioning

confidence: 99%

“…This concentration gradient of the surfactant (C Interface /C Bulk ) between the bulk solution and the bubble interface acts as the primary driving force for reducing bubble size. Notably, the region with the most significant concentration gradient (C Interface /C Bulk ) occurs at the lowest surfactant addition and exerts the most substantial influence in this regard 67 . With the addition of higher concentration of surfactants, C Interface /C Bulk decreases until it reaches a constant value, at which point the bubble's size stabilizes.…”

Section: Resultsmentioning

confidence: 99%

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Effect of chemical species and temperature on the stability of air nanobubbles

Montazeri,

Kalogerakis,

Kolliopoulos

2023

Sci Rep

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The colloidal stability of air nanobubbles (NBs) was studied at different temperatures (0–30 °C) and in the presence of sulfates, typically found in mining effluents, in a wide range of Na2SO4 concentrations (0.001 to 1 M), along with the effect of surfactants (sodium dodecyl sulfate), chloride salts (NaCl), and acid/base reagents at a pH range from 4 to 9. Using a nanobubble generator based on hydrodynamic cavitation, 1.2 × 108 bubbles/mL with a typical radius of 84.66 ± 7.88 nm were generated in deionized water. Multiple evidence is provided to prove their presence in suspension, including the Tyndall effect, dynamic light scattering, and nanoparticle size analysis. Zeta potential measurements revealed that NBs are negatively charged even after two months (from − 19.48 ± 1.89 to − 10.13 ± 1.71 mV), suggesting that their stability is due to the negative charge on their surface. NBs were found to be more stable in alkaline solutions compared to acidic ones. Further, low amounts of both chloride and sulfate dissolved salts led to a reduction of the size of NBs. However, when high amounts of dissolved salts are present, NBs are more likely to coalesce, and their size to be increased. Finally, the investigation of the stability of air NBs at low temperatures revealed a non-monotonic relationship between temperature and NBs upon considering water self-ionization and ion mobility. This research aims to open a new frontier towards the application of the highly innovative NBs technology on the treatment of mining, mineral, and metal processing effluents, which are challenging aqueous solutions containing chloride and sulfate species.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Effect of chemical species and temperature on the stability of air nanobubbles

Montazeri,

Kalogerakis,

Kolliopoulos

2023

Sci Rep

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“…However, it is crucial to state that, in practical industrial processes, it is difficult to maintain a pure liquid phase, and impurities are inevitably present in the majority of industrial processes, especially in some gas-liquid processes such as mineral flotation; hence, it is essential to add the surfactant for enhancing mass transfer [6]. Thus, significant attention must be focused on examining the effect of surfactants on the gas holdup in gas-liquid two-phase systems.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surfactants on Gas Holdup in Shear-Thinning Fluids

Huang

Fan

2017

International Journal of Chemical Engineering

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In this study, the gas holdup of bubble swarms in shear-thinning fluids was experimentally studied at superficial gas velocities ranging from 0.001 to 0.02 m⋅s −1 . Carboxylmethyl cellulose (CMC) solutions of 0.2 wt%, 0.6 wt%, and 1.0 wt% with sodium dodecyl sulfate (SDS) as the surfactant were used as the power-law (liquid phase), and nitrogen was used as the gas phase. Effects of SDS concentration, rheological behavior, and physical properties of the liquid phase and superficial gas velocity on gas holdup were investigated. Results indicated that gas holdup increases with increasing superficial gas velocity and decreasing CMC concentration. Moreover, the addition of SDS in CMC solutions increased gas holdup, and the degree increased with the surfactant concentration. An empirical correlation was proposed for evaluating gas holdup as a function of liquid surface tension, density, effective viscosity, rheological property, superficial gas velocity, and geometric characteristics of bubble columns using the experimental data obtained for the different superficial gas velocities and CMC solution concentrations with different surfactant solutions. These proposed correlations reasonably fitted the experimental data obtained for gas holdup in this system.

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Cassiterite beneficiation in China: A mini-review

Yang²,

Tian³

et al. 2023

J. Cent. South Univ.

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Correspondence of bubble size and frother partitioning in flotation

Cited by 5 publications

References 22 publications

Effect of chemical species and temperature on the stability of air nanobubbles

Effect of chemical species and temperature on the stability of air nanobubbles

Effect of Surfactants on Gas Holdup in Shear-Thinning Fluids

Cassiterite beneficiation in China: A mini-review

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