Tracking velocity of multiple bubbles in a swarm

Acuña, Claudio; Finch, J.A.

doi:10.1016/j.minpro.2010.02.001

Cited by 41 publications

(13 citation statements)

References 43 publications

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“…In the absence of coalescence-inhibiting agents bi-modal bubble size distributions (BSDs) are often observed (Quinn et al, 2007;Finch et al, 2008;Cappuccitti and Nesset, 2009;Yañez et al, 2009;Acuña and Finch, 2010). Fig.…”

Section: Introductionmentioning

confidence: 99%

On the origin of bi-modal bubble size distributions in the absence of frother

Quinn

Finch

2012

Minerals Engineering

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Section: Introductionmentioning

confidence: 99%

On the origin of bi-modal bubble size distributions in the absence of frother

Quinn

Finch

2012

Minerals Engineering

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“…The view chamber was set as an inclined (15 • ) window, and used to disperse the bubbles into a near monolayer [30][31][32]. A light filter was used to improve the uniformity of the light source to provide a sharp contrast between the bubble edges and the background; the bubbles rose through a vertical sampling tube with a 12 mm inner diameter into the viewing chamber filled with the test medium (100 mm length, 150 mm width, and 20 mm depth) to observe bubbles at different points in the circulating tank.…”

Section: Experimental Systemmentioning

confidence: 99%

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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“…The gas holdup was estimated by off-line image analysis using a method similar to what was used by Acuña and Finch (2010), which determines the area occupied by the air bubbles over the unit area using image analysis. The major difference is that the present technique determines the grey level of the typical section in the images (see Fig.…”

Section: Dispersion Of Airmentioning

confidence: 99%

A comparative study of methyl cyclohexanemethanol and methyl isobutyl carbinol as frother for coal flotation

Park

Wang

2016

International Journal of Mineral Processing

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Methyl isobutyl carbinol (MIBC), an aliphatic alcohol, is widely used as a frothing reagent in coal flotation but it has safety concerns owing to its low flash point (approximately 40 °C). In the present work, we studied a cyclic alcohol, methyl cyclohexanemethanol (MCHM) with a high flash point (approximately 110 °C) and compared its coal flotation performance with that of MIBC. A bottom-driven mechanical flotation cell and two coking coals of distinct floatability, namely A and B, were used. Collectorless flotation tests were carried out with process water for coal A. Flotation tests with diesel as collector at 50 ppm were carried out with simulated process water (0.03 M NaCl solution) and highly saline water (0.5 M NaCl solution), respectively, for coal B. The flotation results showed that MCHM was an effective alternative to MIBC. The highly saline water produced sufficient frothing, obviating the necessity of adding MIBC or MCHM. To understand the effect of frother type and concentration and NaCl concentration on the coal flotation performance, we conducted surface tension measurement for the frother solutions, characterised the dispersion of air near bubble sparger, and measured the stabilities of froth, foam, and foam film. It was found that MCHM was more surface active and more capable of stabilizing froth and foam than MIBC.Foam film stability measured at a broad range of interface approach velocity followed a bellshaped trend and at a given NaCl concentration, the observed peak foam film stability of 15 ppm MCHM was higher than that of 15 ppm MIBC. Increasing NaCl concentration from 0.03 M to 0.5 M had the effect of stabilizing the froth and foam but destabilising the thin foam film.

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Tracking velocity of multiple bubbles in a swarm

Cited by 41 publications

References 43 publications

On the origin of bi-modal bubble size distributions in the absence of frother

On the origin of bi-modal bubble size distributions in the absence of frother

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

A comparative study of methyl cyclohexanemethanol and methyl isobutyl carbinol as frother for coal flotation

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