Nanobubble generation and its applications in froth flotation (part II): fundamental study and theoretical analysis

Fan, Minguang; Tao, D.; Honaker, R.Q.; Z, Luo

doi:10.1016/s1674-5264(09)60179-4

Cited by 80 publications

(60 citation statements)

References 21 publications

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“…47 With the advancement of nano-technology, they are gaining industrial applications in water treatment, 48 nanoscopic cleaning, 49 and froth floatation. 50,51 The existence of surface nanobubbles, also known as nano-pancakes, has been proved by atomic force microscopy (AFM). 52,53 The field emission transmission electron microscopy (FE-TEM) technique 47 and dynamic light scattering 54 have also been used to capture the existence of nano-bubbles in aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Formation of methane nano-bubbles during hydrate decomposition and their effect on hydrate growth

Bagherzadeh

Alavi

Ripmeester

et al. 2015

The Journal of Chemical Physics

122

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Molecular dynamic simulations are performed to study the conditions for methane nano-bubble formation during methane hydrate dissociation in the presence of water and a methane gas reservoir. Hydrate dissociation leads to the quick release of methane into the liquid phase which can cause methane supersaturation. If the diffusion of methane molecules out of the liquid phase is not fast enough, the methane molecules agglomerate and form bubbles. Under the conditions of our simulations, the methane-rich quasi-spherical bubbles grow to become cylindrical with a radius of ∼11 Å. The nano-bubbles remain stable for about 35 ns until they are gradually and homogeneously dispersed in the liquid phase and finally enter the gas phase reservoirs initially set up in the simulation box. We determined that the minimum mole fraction for the dissolved methane in water to form nano-bubbles is 0.044, corresponding to about 30% of hydrate phase composition (0.148). The importance of nano-bubble formation to the mechanism of methane hydrate formation, growth, and dissociation is discussed.

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Section: Introductionmentioning

confidence: 99%

Formation of methane nano-bubbles during hydrate decomposition and their effect on hydrate growth

Bagherzadeh

Alavi

Ripmeester

et al. 2015

The Journal of Chemical Physics

122

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“…Therefore, adding gas with a higher solubility in water would facilitate tiny bubble generation by cavitation. The effect of different types of gasses (eg, air, O 2 , N 2 , Ar, CO 2 ) on nanobubble generation was examined . The results confirmed that the sizes of tiny bubbles that were generated correlated to the gas solubility in water; A larger size of tiny bubbles was obtained with a gas with a higher solubility, accompanied by more tiny bubbles generated .…”

Section: Generation Of Micro‐nanobubblesmentioning

confidence: 74%

“…A typical size distribution of bubbles generated by cavitation tube spargers: A, natural water without adding air; and B, natural water with air addition …”

Section: Generation Of Micro‐nanobubblesmentioning

confidence: 99%

Role of mineral flotation technology in improving bitumen extraction from mined Athabasca oil sands—II. Flotation hydrodynamics of water‐based oil sand extraction

Zhou¹,

HaiHong²,

Chow³

et al. 2019

Can J Chem Eng

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Bitumen flotation hydrodynamics in water‐based oil sand extraction is critically reviewed by comparing aeration of oil sand slurries with mineral flotation. The role of the two‐stage particle‐bubble attachment model in flotation is emphasized as a means to accelerate bitumen flotation recovery. It involves the generation of micro/nanobubbles and their frosting on hydrophobic bitumen droplets, followed by their attachment to a flotation‐size bubble via its coalescence with the nanobubbles frosted on the bitumen. Nanobubble generation by hydrodynamic cavitation demonstrates that the size of nanobubbles can be reduced, and the number of nanobubbles increased by fast liquid flow, intensified agitation, high dissolved gas content and surfactant concentration. The mechanism of pre‐existing gas nuclei in enhancing nanobubble generation by cavitation is utilized to produce a large volume of stabilized nanobubbles for practical flotation, by continuously recirculating the stream through a gas saturation tank or a cavitation tube. The aeration of oil sand slurries in hydrotransport pipelines is analyzed based on its similarity to dissolved air flotation. Bitumen extraction recovery increased significantly with the presence of nanobubbles in the system. The role of improved flotation hydrodynamics in bitumen recovery is briefly discussed in terms of the Suncor operation using flotation columns to process oil sand middling streams. Future research should be directed at understanding bitumen flotation kinetics, optimizing size ranges of nanobubbles for maximized flotation recovery, minimizing wearing of cavitation tubes in industrial operations, and intensifying the role of in‐situ nanobubble nucleation on hydrophobic particles/bitumen droplets in flotation, especially for bitumen extraction from underperforming oil sands.

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“…The micro/nanobubbles attached to the mineral surface can provide a significant enhancement in the collision and adhesion process of air bubbles and mineral particles (Schubert, 2005;Ahmed, 2010). It is known that micro/nano-bubbles attach to particle surface more stable than conventional bubbles (Fan et al, 2010b;Fan et al, 2010c;Ushikubo et al, 2010;Hang and Massoud, 2014.). In such a case, micro/nano-bubbles increase fine mineral hydrophobicity.…”

Section: Supersaturated Cavitation Effectmentioning

confidence: 99%

Mechanism of micro/nano-bubble formation and cavitation effect on bubbles size distribution in flotation

Deng¹,

Liu²,

Gan³

et al. 2020

Physicochem. Probl. Miner. Process.

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In this study, micro/nano-bubble generated by cavitation effect as a promoting factor for flotation was investigated using the atomic force microscope (AFM). Hydrodynamic cavitation tests were performed with a venturi bubble generator. Additionally, bubble size distribution (BSD) under the hydrodynamic cavitation effect was also studied at different water flow speed conditions. Dozens of nanometers height bubbles attached to the hydrophobic substrates were detected. Besides, the cavitation cloud grew thicker with the flow velocity increasing from 26.52 m/sec to 53.04 m/sec, near the venturi tube nozzle. All results showed the importance of the cavitation effect on the micro/nanobubbles formation and the BSD in flotation.

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Nanobubble generation and its applications in froth flotation (part II): fundamental study and theoretical analysis

Cited by 80 publications

References 21 publications

Formation of methane nano-bubbles during hydrate decomposition and their effect on hydrate growth

Formation of methane nano-bubbles during hydrate decomposition and their effect on hydrate growth

Role of mineral flotation technology in improving bitumen extraction from mined Athabasca oil sands—II. Flotation hydrodynamics of water‐based oil sand extraction

Mechanism of micro/nano-bubble formation and cavitation effect on bubbles size distribution in flotation

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