Experimental study on effect of surfactant and solution property on bubble rising motion

Pang, Mingjun; Meng, Jian; Yang, Fei

doi:10.1016/j.molliq.2023.121390

Cited by 6 publications

(1 citation statement)

References 70 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this scenario, the hydrophobicity of mineral particles cannot alone ensure successful attachment. Especially in the presence of surfactants, the air–water interface can be rendered immobile by completing adsorption onto the bubbles. − The consequent hydrodynamic resistance can prevent enough liquid outflow from the confined film region in the time-limited contact process, which is obviously unfavorable for the capture of valuable particles . Wang et al has observed that in the solution of 5.0 mM sodium dodecyl sulfate, even hydrophobic glass beads cannot effectively attach to the bubble surface, giving rise to the attachment efficiency of approximately 0%.…”

Section: Introductionmentioning

confidence: 99%

Quantifying Contributions of Different Repulsion to Film Drainage Time during the Bubble–Solid Surface Attachment and Implications for the Flotation of Fine Particles

Li,

Wang,

Manica

et al. 2024

Langmuir

View full text Add to dashboard Cite

The flotation recovery of fine particles faces serious challenges due to the lack of kinetic energy required for supporting their radial displacement and attachment with bubbles. Generally, the hydrodynamic resistance and repulsive disjoining pressure successively inhibit the liquid outflow intervening between the bubble and solid surfaces. To quantitatively characterize the influence of the main repulsion on film thinning time, experiments have been designed in three different aqueous systems. Bubble surface mobility closely associated with hydrodynamic resistance was determined by the rising bubble technique, and the DLVO theory was employed to confirm the evolution of electrostatic repulsion. The film drainage process was then measured based on the high-speed microscopic interferometry. Furthermore, the influence of the main repulsion on bubble−solid surface interactions was examined by flotation recovery. Results show that the earlier buildup of hydrodynamic force ran through the whole film thinning process, and under immobile conditions, the central region gradually became dominant in film thinning due to the very limited fluid flow at the thinnest rim position. Therefore, to achieve the identical film thickness (∼100 nm), the large hydrodynamic resistance could prolong the film thinning time by about 1 order of magnitude, compared with that induced by electrostatic repulsion, which accounts for the increased flotation recovery by 10% using mobile bubbles. This study not only enhances the understanding of how typical repulsive forces work in film drainage dynamics but also opens up an avenue for enhancing flotation and avoiding wasting resources by modulating bubble surface mobility and thus micro/nanoscale fluid flow.

show abstract