Drop attachment behavior of oil droplet-gas bubble interactions during flotation

Yan, Shenglin; Yang, Xiaoyang; Bai, Zhishan; Xu, Xiahong; Wang, Hualin

doi:10.1016/j.ces.2020.115740

Cited by 49 publications

(27 citation statements)

References 40 publications

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“…In contrast, the hydrophobic particles on the surface of the mineralized bubbles show electrostatic repulsion in the ab- It is believed that the impact of DBP on froth stability is closely related to its bridging agglomeration effect on quartz particles shown in Figures 5 and 6. Yan et al [34] studied oil film spreading on the surface of a bubble and concluded that the original water film on the bubble can be replaced by the oil film during the flotation process. Consequently, hydrophobic interactions occur between DBP-coated bubbles and hydrophobic aggregates of quartz, further enhancing the bubble mineralization process.…”

Section: Effect Of Dbp On Entrainment In Frothmentioning

confidence: 99%

Synergistic Effect of DBP with CTAB on Flotation Separation of Quartz from Collophane

Tao

Zhang

et al. 2021

Minerals

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Collophane is difficult to upgrade by reverse flotation of quartz with amine collector alone due to its low grade, complex structure, fine dissemination grain size, etc. This investigation was conducted to explore the synergistic effect of dibutyl phthalate (DBP) as a surfactant with cetyltrimethyl ammonium bromide (CTAB) as the collector on the separation of quartz from collophane by means of micro-flotation tests, surface tension and aggregate size measurements, and froth water mass fraction/recovery characterization. It was found that DBP reduced the surface tension of the reagent solution and enhanced the collision probability between bubbles and quartz particles by increasing the size of aggregates through increased hydrophobic interaction between the quartz particles and DBP droplets. The addition of DBP reduced the entrainment of fine collophane particles as a result of improved defoaming and increased the flotation recovery of quartz without resulting in any flotation of collophane at dosages lower than 200 mg/L. Flotation test results with the binary artificial mineral mixture showed that DBP improved the P2O5 recovery, SiO2 rejection, and P2O5 grade by up to 7%, 12%, and 1%, respectively.

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Section: Effect Of Dbp On Entrainment In Frothmentioning

confidence: 99%

Synergistic Effect of DBP with CTAB on Flotation Separation of Quartz from Collophane

Tao

Zhang

et al. 2021

Minerals

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“…Yan 33 pointed out that Laplace pressure is the main driving force of liquid film drainage in the initial stage of liquid film drainage. These discoveries provide strong support for understanding the mechanism of coalescence and its industrial applications.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Lu 32 used microfluidic and high‐speed camera technology to show the influence of precursor film on oil droplet collision and coalescence. Yan 33 pointed out that Laplace pressure is the main driving force of liquid film drainage in the initial stage of liquid film drainage. These discoveries provide strong support for understanding the mechanism of coalescence and its industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics and morphologies of droplets coalescence on fiber

et al. 2022

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Fiber coalescence is an effective oil-water separation technology. In this article, the micro-coalescence process of droplets on fiber was studied through high-speed camera technology, and the hydrodynamics and morphology evolution in the process of droplet-fiber coalescence were explored and compared with non-fiber system. The results show that the change of the droplet surface morphology is local at the initial stage of the coalescence process. The droplet morphology changes obviously near the neck. The growth rate of the liquid bridge and the propagation speed of capillary wave in droplet-fiber system are higher than those in non-fiber system. At 0.8 ms, the capillary waves' polar angle difference between the two conditions reaches 10.44 . There is an obvious periodicity and damping attenuation mechanism in the oscillation process. In the droplet-fiber system, the oscillation process attenuates faster and the average oscillation period is shorter. The droplet relaxes to a stable state more quickly.

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“…Overall, previously these bubble–droplet or droplet–droplet systems have been mostly studied in the context of the spreading coefficient (SC), ,,− which, by definition, is restricted only to limiting cases of the emerging shapes, and even then, their validity is questionable at the scales where other effects (e.g., effects of the pressure forces due to curvature of the interface) become significant alongside the interfacial forces. The concept of the spreading coefficient was first formalized in 1865 by Marangoni. , (Similar results were later published by other authors independently. ,, ) The spreading coefficient is defined as where γ 13 is the interfacial tension between the base fluid and the surrounding medium, γ 23 is the interfacial tension between the spreading fluid and the surrounding medium, and γ 12 is the interfacial tension between the base fluid and the spreading fluid.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Investigation of Droplet–Droplet and Bubble–Droplet Equilibrium in an Immiscible Medium

et al. 2021

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In the absence of external fields, interfacial tensions between different phases dictate the equilibrium morphology of a multiphase system. Depending on the relative magnitudes of these interfacial tensions, a composite system made up of immiscible fluids in contact with one another can exhibit contrasting behavior: the formation of lenses in one case and complete encapsulation in another. Relatively simple concepts such as the spreading coefficient (SC) have been extensively used by many researchers to make predictions. However, these qualitative methods are limited to determining the nature of the equilibrium states and do not provide enough information to calculate the exact equilibrium geometries. Moreover, due to the assumptions made, their validity is questionable at smaller scales where pressure forces due to curvature of the interfaces become significant or in systems where a compressible gas phase is present. Here we investigate equilibrium configurations of two fluid drops suspended in another fluid, which can be seen as a simple building block of more complicated systems. We use Gibbsian composite-system thermodynamics to derive equilibrium conditions and the equation acting as the free energy (thermodynamic potential) for this system. These equations are then numerically solved for an example system consisting of a dodecane drop and an air bubble surrounded by water, and the relative stability of distinct equilibrium shapes is investigated based on free-energy comparisons. Quantitative effects of system parameters such as interfacial tensions, volumes, and the scale of the system on geometry and stability are further explored. Multiphase systems similar to the ones analyzed here have broad applications in microfluidics, atmospheric physics, soft photonics, froth flotation, oil recovery, and some biological phenomena.

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Drop attachment behavior of oil droplet-gas bubble interactions during flotation

Cited by 49 publications

References 40 publications

Synergistic Effect of DBP with CTAB on Flotation Separation of Quartz from Collophane

Synergistic Effect of DBP with CTAB on Flotation Separation of Quartz from Collophane

Hydrodynamics and morphologies of droplets coalescence on fiber

Thermodynamic Investigation of Droplet–Droplet and Bubble–Droplet Equilibrium in an Immiscible Medium

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