A study of bubble size evolution in Jameson flotation cell

Zhu, Hongzheng; Valdivieso, A. López; Zhu, Jinbo; Song, Shaoxian; Min, Fanfei; Arroyo, Mario Alberto Corona

doi:10.1016/j.cherd.2018.08.005

Cited by 24 publications

(16 citation statements)

References 29 publications

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“…A higher concentration resulted in a smaller slope, which represents smaller variations in bubble size. During the ascending process of the bubble in the flotation cell, the hydrostatic pressure and concentration of frothers play an important role in the BSD; however, the hydrostatic pressure has little effect on the bubble size in the range of sampling height due to the difference in hydrostatic pressure between the top and the bottom of the slurry being very small, the study [34] had found that there was almost no variation on the bubble size during the rising process of single bubble at each concentration, however, the D 32 of the bubble group increased with the increase of sampling height, and a higher frother concentration resulted in a smaller increases. Hence, here, the frother concentration played a major role in BSD compared to the height of the sampling location.…”

Section: Effect Of Sampling Location On Bubble Sizementioning

confidence: 94%

“…The D 32 at a different Minerals 2019, 9, 369 6 of 14 height of the sampling location were studied by moving the inlet of the sampling tube vertically up. All tests were performed at room temperature (20 ± 1 • C) using tap water of pH 6.8 [33,34].…”

Section: Experimental Conditions and Methodsmentioning

confidence: 99%

“…height of the sampling location were studied by moving the inlet of the sampling tube vertically up. All tests were performed at room temperature (20 ± 1 °C) using tap water of pH 6.8 [33,34]. Images of the bubbles sliding up the inclined view chamber were captured using an i-SPEED 3 high-speed camera (CINV Optical Instruments Co., Ltd., Nanjing, China) at a rate of 4000 frames per second and a typical image resolution of 768 × 576 px.…”

Section: Effect Of Feeding Pressure On Suction Capacity and Negative mentioning

confidence: 99%

“…D32/mm References Mechanical flotation cell 0.80-0.90 [26,28] Jameson cell 0.65-0.70 [34,38] Column flotation 0.75-0.80 [39,40] Figure 8 presents the orientation of the frother molecules at the air/water interface, and effect of different frother concentrations adsorbed on the surface of bubbles during the collision, coalescence, and separation of bubbles. It can be seen from Figure 8 that a lower frother concentration adsorbed on the surface of bubbles easily, causing them to coalesce and generate larger bubbles from smaller bubbles during bubble collision; conversely, a higher frother concentration effectively prevents bubble coalescence during the process of bubble collision.…”

Section: Flotation Machinementioning

confidence: 99%

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Bubble Size Distribution Characteristics of a Jet-Stirring Coupling Flotation Device

et al. 2019

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In this study, a new jet-stirring coupling flotation device that incorporates the advantages of three conventional flotation machines (specifically, Jameson cell, mechanical flotation cell, flotation column) was designed based on jet suction. The suction capacity of a double cosine self-aspirated nozzle utilized by the device was analyzed under different feeding pressures, and the effects of frother concentration, feeding pressure, suction capacity, and height of sampling location on the bubble size distribution (BSD) were investigated using a high-speed video system. It was found that a large amount of air was sucked into the flotation cell by the self-aspirated nozzle arranged in a non-submerged manner, which met the requirements of flotation in terms of the suction amount of air. The suction capacity showed a positive linear correlation with negative pressure inside the nozzle. When the Methyl isobutyl carbinol (MIBC) concentration reached the critical coalescence concentration (CCC), the bubble size stabilized at approximately 0.31 mm, which was smaller than the bubble size produced by the conventional flotation machine. This indicated that bubbles suitable for flotation were generated. D 32 linearly decreased with increasing of feeding pressures and conversely increased with increasing suction capacities and sampling location heights, independent of the frother concentration. sized bubbles [10]. A Venturi type bubble generator can produce a large number of micro bubbles [13] and the Jameson cell has a low energy consumption [14]. It has been found that a rotational flow in the cyclonic-static micro-bubble flotation column is a benefit for the particles colliding with and attaching to the bubbles, and the probability of particle attachment substantially increased [15]. A non-uniform filling method was proposed to optimize the flow field. Filling with a non-uniform sieve in the cyclonic-static micro-bubble flotation column was proved to be more effective on bubble size distribution equalization [16]. In addition, it was found that rotational flow improves the effect of mineralization and increases the recovery of coarse coal particles in the cyclonic-static micro-bubble flotation column [17]. Moreover, a nozzle equipped with a long throat and arranged in a submerged manner was studied [18]. It was observed that the suction capacity of the nozzle increased with the nozzle distance and cross-section ratio. Furthermore, it resulted in a high jet kinetic energy dissipation rate. However, when exposed to air, either the suction capacity decreased significantly, or the nozzle failed to work properly.As we all know, the processes of collision, detachment, and attachment between the bubbles and the coal particles complete the final coal slime flotation process [19]. The bubble is the main carrier of the flotation process. The bubble size distribution has a significant influence on the selectivity of the bubble and the ability to carry the target mineral [20]. Bubbles of different sizes have different abilities to sepa...

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Section: Effect Of Sampling Location On Bubble Sizementioning

confidence: 94%

Section: Experimental Conditions and Methodsmentioning

confidence: 99%

Section: Effect Of Feeding Pressure On Suction Capacity and Negative mentioning

confidence: 99%

Section: Flotation Machinementioning

confidence: 99%

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Bubble Size Distribution Characteristics of a Jet-Stirring Coupling Flotation Device

et al. 2019

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“…Pulp froth interface will, in turn, impact froth stability and flotation performance by increasing water recovery (Mesa et al, 2019). Zhu et al, (2018) experimented on down comer experimental apparatus using Methyl isobutyl carbinol (MIBC) and air bubbles (Zhu et al, 2018), and it was seen that the d32 values of air bubbles decreased with the increase of MIBC concentration. As seen in the Critical Coalescence Concentration (CCC), above which the d32 was almost constant at about 0.645 mm, indicates that MIBC concentration tends to produce a bubble of similar size.…”

Section: Effect Of Turbulence and Addition Of Reagent On Bubble Growthmentioning

confidence: 99%

Dynamics of bubble-particle interaction in different flotation processes and applications - a review of recent studies

Patnaik¹,

Menon²,

Gupta³

et al. 2020

Physicochem. Probl. Miner. Process.

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Flotation process involves aggregation of the particles based on the material/compound type of random mixtures such as ores and seawater. It is primarily used in pretreatment of water desalination and other industrial applications. The process makes use of various fluid mechanics principles as multifluids are involved. The multi-fluids in most of the flotation processes are of different phases, such as air and water. Like any other process, the efficiency of flotation is important, and hence most of the studies have been dedicated to understanding how the various parameters are affecting the flotation process. Among various parameters, fluids properties and flow parameters chiefly affect the flotation process. In particular, the bubble-particle interaction of the flotation process has been of interest as it is one of the cost-effective ways to enhance flotation efficiency. In this review, the authors present the latest developments in such parametric studies. This paper could be of interest to research students, academic researchers, and practitioners who want to contribute to (or take from) flotation research.

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Recent advances in computational fluid dynamics simulation of flotation: a review

Wang

Yan

et al. 2021

Asia-Pacific J Chem Eng

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Flotation process is a multi‐phase and multi‐scale complex flow system, in which hydrodynamics plays an indispensable role. In recent years, computational fluid dynamics (CFD) numerical simulation has gradually become a powerful tool for studying flotation. In this review, the theories of CFD numerical simulation in flotation research were reviewed, involving various turbulence models and multi‐phase flow simulation approaches. An attempt has been made to analyze and discuss the characteristics and applicability of different turbulence models and multi‐phase flow simulation approaches in flotation researches in detail. The CFD simulation of two commonly used flotation devices, that is, mechanically agitated flotation machine and flotation column, has been reviewed in detail. The detailed principles, operation, and hydrodynamic of flotation devices were discussed from the viewpoint of CFD. The advances made in CFD simulation for studying flotation process, including particle suspension, bubble dispersion, particle–bubble collision, attachment, and detachment subprocesses have been critically analyzed. Focused analysis was given on the influence mechanism of turbulence on the particle–bubble interactions. Finally, the gaps in the available literature are discussed and potential research directions are also proposed.

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A study of bubble size evolution in Jameson flotation cell

Cited by 24 publications

References 29 publications

Bubble Size Distribution Characteristics of a Jet-Stirring Coupling Flotation Device

Bubble Size Distribution Characteristics of a Jet-Stirring Coupling Flotation Device

Dynamics of bubble-particle interaction in different flotation processes and applications - a review of recent studies

Recent advances in computational fluid dynamics simulation of flotation: a review

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