The effect of stirring speed and induction time on flotation

Koh, P.T.L.; Smith, L.K.

doi:10.1016/j.mineng.2010.12.007

Cited by 39 publications

(16 citation statements)

References 16 publications

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“…Flotation occurs from a true solution to a real problem encountered in industries; this is generally considered to be one of the main advantages of the flotation process, i.e., its ability to avoid consuming time. The duration of agitation or the conditioning time of the sample before the introduction of bubbles could have a positive influence on separation and it has been recognized for some time as an important methodology for improving the performance of the flotation process [10,19]. Nevertheless, some researchers have advised not using an introduction period, but adding the surfactant at the beginning of the flotation or even stepwise during the flotation process [10].…”

Section: Introductionmentioning

confidence: 99%

Treating Produced Water Using Induced Air Flotation: The Effect of Ethanol on Conditioning and Flotation of PAHs in the Presence of Tween 80

Chebbi

Allouache

Schwarz

et al. 2019

Pol. J. Environ. Stud.

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Induced air flotation (IAF) was used to recover the total polycyclic aromatic hydrocarbons (PAH tot ) from produced water (PW), a real oilfield effluent sampled from the hydrocarbon storage tanks at SONATRACH of Bejaia. Tween 80 was used as a collector at a test concentration of 0.5% (V/V%) and ethanol was used as a frother at a test dosage of 0.5 mL/1000 mL of PW. The natural presence of NaCl at greater concentrations may improve the removal efficiency of PAH tot from PW by IAF. We found that the conditioning step before initiating the flotation process is important for PAH tot recovery. A PAH tot recovery of 93.67% was achieved at 30 min of conditioning and 20 min of flotation. We also found that in the presence of Tween 80 during the conditioning step, PAH tot have a tendency to reach the water-air surface. It was disclosed that the addition of ethanol in PW during the conditioning has reduced both the conditioning time from 30 min to 10 min and the flotation time from 20 min to 12 min, which is beneficial from an economic standpoint. The effect of ethanol on the flotation kinetics of PAH tot was explained well by the Higuchi model.

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Section: Introductionmentioning

confidence: 99%

Treating Produced Water Using Induced Air Flotation: The Effect of Ethanol on Conditioning and Flotation of PAHs in the Presence of Tween 80

Chebbi

Allouache

Schwarz

et al. 2019

Pol. J. Environ. Stud.

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“…The poor flotation of coarse particles in conventional, mechanically agitated flotation cells is often attributed to the high turbulent energy dissipation caused by the rotating impellers (cell hydrodynamics) [6,8,16]. Increasing the impeller rotation speed increases the local turbulent energy dissipation rate [8], which in turn, increases the liquid/bubble velocities.…”

Section: Introductionmentioning

confidence: 99%

“…Increasing the impeller rotation speed increases the local turbulent energy dissipation rate [8], which in turn, increases the liquid/bubble velocities. This reduces the overall contact time between bubbles and particles during the bubble-particle attachment process, and increases inertial forces leading to detachment either in the pulp or on impact with the pulp-froth interface.…”

Section: Introductionmentioning

confidence: 99%

Incorporating fluidised-bed flotation into a conventional flotation flowsheet: A focus on energy implications of coarse particle recovery

2015

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“…To date, parameters at mesoscopic level in 3D space remain unclear, and systematical studies on distribution of local gas holdup, turbulence intensity, turbulent kinetic energy, and velocity magnitude are still lacking. With the development of high-performance calculation, computational fluid dynamics (CFD) [11][12][13][14][15][16][17][18][19] 19 is considered an effective tool for studying fluid dynamic parameters at mesoscopic level. Therefore, in this study, CMFA is analyzed with CFD; such analysis could be useful as guide or reference for future numerical studies.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of flow in a highly efficient flotation column

Gong

2014

Asia-Pacific J Chem Eng

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For the purpose of optimization by numerical analysis, a highly efficient flotation column named cyclonicstatic micro-bubble flotation apparatus, which is widely used in mineral processing, was simulated with computational fluid dynamics to study the distributions of velocity magnitude, pathlines, turbulent intensity, and turbulent kinetic energy under different discretization schemes, turbulence models, and rotational speeds of pump. This simulation was based on the volume of fluid multiphase and multiple reference frame models. Spatial discretization scheme had an obvious effect on the velocity distribution in the column and revolving flotation sections, especially in the former. The introduction of a turbulence model changed the velocity distribution, the turbulence state, and the pathlines in the column and revolving flotation sections. Moreover, the standard, renormalization group (RNG), and realizable k-epsilon turbulence models had numerous differences. Among these models, the RNG and realizable turbulence models had the most similar results. As the rotational speed of pump increased, velocity and turbulence field intensified. The flow field in the column flotation section differed from that in the revolving flotation section.

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The effect of stirring speed and induction time on flotation

Cited by 39 publications

References 16 publications

Treating Produced Water Using Induced Air Flotation: The Effect of Ethanol on Conditioning and Flotation of PAHs in the Presence of Tween 80

Treating Produced Water Using Induced Air Flotation: The Effect of Ethanol on Conditioning and Flotation of PAHs in the Presence of Tween 80

Incorporating fluidised-bed flotation into a conventional flotation flowsheet: A focus on energy implications of coarse particle recovery

Numerical analysis of flow in a highly efficient flotation column

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