Effect of solid particles on gas holdup in flotation columns—II. Investigation of mechanisms of gas holdup reduction in presence of solids

Banisi, S.; Finch, J.A.; Laplante, A.R.; Weber, M.

doi:10.1016/0009-2509(95)00076-h

Cited by 38 publications

(6 citation statements)

References 36 publications

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“…Effects of hydrodynamic interactions between bubbles and solids are considered too (Fan and Tsuchiya, 1990). Relative importance of several possible mechanisms (coalescence, mixture density and viscosity, radial profiles, wake effects) causing the decrease of voidage in a particular flotation system has been evaluated (Banisi et al, 1995b).…”

Section: Introductionmentioning

confidence: 99%

Effect of solids on homogeneous–heterogeneous flow regime transition in bubble columns

Mena

Růžička

Rocha

et al. 2005

Chemical Engineering Science

104

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Experiments were conducted to study the effect of the presence of the solid phase on the homogeneous-heterogeneous flow regime transition in a bubble column 0.14 m diameter. Air, distilled water and calcium alginate beads (2.1 mm, 1023 kg/m 3 ) at concentrations c = 0-30% (vol.) were the phases. The basic data were the voidage-gas flow rate dependences. The critical point, where the homogeneous regime loses stability and the transition begins, was evaluated by the drift flux model. The critical values of voidage and gas flow rate were the quantitative measures of the homogeneous regime stability. These were plotted against the solid phase concentration. It was found, that both the voidage and the critical values increased with the solid content at low solid loading, approx. c = 0-3%, and decreased at higher loading, c > 3%. The homogeneous regime was thus first stabilized and then destabilized. To explain this dual effect, possible physical mechanisms of the solid phase influence on the uniform bubble bed were discussed.

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Section: Introductionmentioning

confidence: 99%

Effect of solids on homogeneous–heterogeneous flow regime transition in bubble columns

Mena

Růžička

Rocha

et al. 2005

Chemical Engineering Science

104

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“…An increase in the liquid viscosity not only alters the shape of the bubbles, but also affects the bubble trajectories as well as the rising velocity of the bubble . Banisi et al , reported a contradictory result of a decrease in the bubble size with increase in the superficial gas velocity which was as a result of the bubble breakup due to bubble-eddies collision rate. Though, in the present study, it is clear that the presence of solid particles increases the bubble size.…”

Section: Resultsmentioning

confidence: 99%

“…Small solid particles (<100 μm) with particle content range of 0–3.0 wt % have no influence on the hydrodynamics behavior . Usually, when the gas velocity increases the bubble size also increases, but few researchers observed a reduction in bubble diameter attributable to bubble breakup due to augmentation of bubble-eddies collision frequency. , Vazirizadeh et al investigated the influence of particle on BSD and observed that the BSD of the system becomes a little wider in the presence of particles. Published literature shows that BSD measurement was conducted in the low particle concentration ( c s < 15%) and low superficial gas velocity ( u sg < 0.1 m/s). ,, Few researchers carried out the measurement of BSD in a high slurry concentration. ,, Understanding of bubble size in both radial and axial directions is essential for improvement of process efficiency.…”

Section: Introductionmentioning

confidence: 99%

Particle-Laden Bubble Size and Its Distribution in Microstructured Bubbling Bed in the Presence and Absence of a Surface Active Agent

Prakash

Majumder

Singh

2019

Ind. Eng. Chem. Res.

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This work reports experimental measurements of the bubble size and its distribution in the three-phase (air–water–coal and air–water–coal–surfactant) system. A thorough investigation of the effect of particle concentration, particle size, viscosity, and axial positions on bubble size and its distribution in the presence and absence of the surfactant is reported. Bubble size distribution (BSD) in three different experimental conditions is studied which follows the beta, Weibull, and log–logistic nature of the distribution function. Correlations are developed for estimation of parameters of each distribution function. A generalized correlation model is also developed for the estimation of the Sauter mean bubble diameter, aspect ratio, and interfacial area in the three-phase system by considering operating, geometric variables, and physical properties of the system. The current work will be useful for process intensification of chemical and biochemical processes based on the interfacial phenomena.

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“…The tested systems often do not contain surfactant such as frother designed to retard coalescence. Banisi et al [15] testing a range of solids in the presence of frothers presented data that suggested a de- Figure 1. General trend in gas holdup upon increasing the (a) frother concentration only, and (b) percent solids only (adopted by [8]) crease in gas hold-up can occur without change (increase) in bubble size.…”

Section: The Pulp Zonementioning

confidence: 99%

The Effects of Frothers and Particles on the Characteristics of Pulp and Froth Properties in Flotation—A Critical Review

Zhang¹

2016

JMMCE

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The pulp and froth zones are the main components of froth flotation as it defines both quality of the end product and overall efficiency. The importance of the properties of the two zones, which include pulp hydrodynamics, froth bubble coalescence rate, water overflow rate, air recovery, etc., is being increasingly recognized. The properties are depending not only on the type and concentration of the frother but also on the nature and amount of the particles present in the flotation system, and as well as the frother-particle interactions and potentially of bubble-particle interactions. To date, there is no specific criterion to quantify pulp and froth properties through the interactions between frothers and particles because the various related mechanisms occurring in the pulp and froth are not fully understood. Linking the properties to the metallurgical performance is also challenged. In order to better understand the effect of these issues in flotation, in this review paper, the past and recently published articles relevant to characterizations of pulp and froth properties are widely reviewed; the findings and the gap of knowledge in this area are highlighted for further research.

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Effect of solid particles on gas holdup in flotation columns—II. Investigation of mechanisms of gas holdup reduction in presence of solids

Cited by 38 publications

References 36 publications

Effect of solids on homogeneous–heterogeneous flow regime transition in bubble columns

Effect of solids on homogeneous–heterogeneous flow regime transition in bubble columns

Particle-Laden Bubble Size and Its Distribution in Microstructured Bubbling Bed in the Presence and Absence of a Surface Active Agent

The Effects of Frothers and Particles on the Characteristics of Pulp and Froth Properties in Flotation—A Critical Review

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