Bubble size as a function of impeller speed in a self-aeration laboratory flotation cell

Girgin, E.H.; Do, Seong-bin; Gómez, C.O.; Finch, J.A.

doi:10.1016/j.mineng.2005.09.002

Cited by 48 publications

(22 citation statements)

References 8 publications

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“…Bubbles rose into the viewing chamber and were imaged by a digital camera as they slid up the inclined window, which was illuminated from behind. In this research, at first, frother was added to the water of the cell and then the viewing chamber was filled with water of the cell to prevent bubble coalescence [25].…”

Section: Methodsmentioning

confidence: 99%

Study of Relationship between Flotation Rate and Bubble Surface Area Flux using Bubble-Particle Attachment Efficiency

Shahbazi¹

2015

AJCHE

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Abstract:Understanding the attachment micro process is a fundamental step toward predicting the rate constant of flotation kinetics. In this research, the effect of bubble-particle attachment efficiency on k-S b relationship was investigated under Yoon, Stokes and Potential conditions. Maximum Stokes attachment efficiency obtained was 55.9% with particle size of -37 µm, S b of 34.2 1/s and flotation rate of 1.65 1/min. Stokes attachment efficiency was less than Yoon efficiency and it seems to be a suitable equation for predicting attachment efficiency. Furthermore, three different models were obtained for estimating attachment efficiency usingk-S b relationship.

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Section: Methodsmentioning

confidence: 99%

Study of Relationship between Flotation Rate and Bubble Surface Area Flux using Bubble-Particle Attachment Efficiency

Shahbazi¹

2015

AJCHE

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“…The closed assembly is filled with water of similar nature to that in the flotation cell (to limit changes in bubble environment during sampling) and the tube is immersed to the desired location below the froth. Bubble raise into the viewing chamber and are imaged by a digital photo camera as they slide up the inclined window illuminated from behind [17].…”

Section: Methodsmentioning

confidence: 99%

“…In this research, bubble size distribution was measured similar to McGill bubble viewer [17]. The mean bubble diameter adopted was the Sauter diameter, calculated by the equation below [18]:…”

Section: Bubble Size Distributionmentioning

confidence: 99%

Effect of Frother on Bubble-Particle Collision Probability of Fine Particles

Shahbazi¹

2015

AJCHE

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Abstract:The frothers are influence on the ability of bubbles to collect particles from the pulp and carry them to the froth layer. In this study the effect of type and dosage of frothers on bubble-particle collision probability and dispersion of fine particles was investigated. Therefore, collision probability of fine particles was calculated using frothers such as MIBC, Pine Oil, and Poly propylene glycol with concentration of 0, 25, 50 and 75 g/t respectively. According to this study, as the particle size increased the probability of collision increased but with using Poly Propylene Glycol, MIBC and Pine Oil, probability of collision increased, respectively. Under Potential flow conditions, Maximum collision probability was obtained 27.27% with Poly Propylene Glycol dosage of 75 g/t and particle size of 50 µm.

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“…At the froth-pulp interface, gas bubbles with attached particles are transferred from the pulp zone to the froth layer at the rate bubbles arrive at the interface. Based on bubble size measurements in air-water system with frother addition (Girgin et al, 2006), an average diameter of 1 mm is applied in the model.…”

Section: Model Descriptionmentioning

confidence: 99%

“…The air flow rates predicted by CFD are compared against measured values reported in the literature for this cell (Girgin et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

CFD model of a self-aerating flotation cell

Koh

Schwarz

2007

International Journal of Mineral Processing

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The effect of impeller speed on the air flow in a selfaerated Denver laboratory flotation cell was investigated using computational modelling. Air is induced into the slurry by the impeller's rotating action. The rate of air flow is determined by the suction pressure created by the impeller, the hydrostatic head of the slurry and the frictional losses along the delivery shaft from the inlet valve to the impeller. From two-phase simulations of the flotation cell at varying impeller speeds, the predicted air flow rates have been found to compare favourably against measured values reported in the literature. The effect of increasing impeller speed is to increase the air flow rate and gas holdup in the cell. Simulations with flotation kinetics showed that the gravitational force acting on the attached particles is significant. The effect is a decrease in the bubble rise velocity which in turn affects the flotation rate as predicted by the model. μ dynamic viscosity [Pa-s]

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Bubble size as a function of impeller speed in a self-aeration laboratory flotation cell

Cited by 48 publications

References 8 publications

Study of Relationship between Flotation Rate and Bubble Surface Area Flux using Bubble-Particle Attachment Efficiency

Study of Relationship between Flotation Rate and Bubble Surface Area Flux using Bubble-Particle Attachment Efficiency

Effect of Frother on Bubble-Particle Collision Probability of Fine Particles

CFD model of a self-aerating flotation cell

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