Gas dispersion in column flotation and its effect on recovery and grade

Saucedo, Felipe de Jesús López; Uribe‐Salas, A.; Pérez‐Garibay, R.; Magallanes-Hernández, L

doi:10.1179/1879139511y.0000000033

Cited by 12 publications

(11 citation statements)

References 16 publications

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“…More specifically, several studies found a close relation between bubble surface area flux and gas hold up with the flotation performance (Gorain et al, 1997;Finch et al, 2000;López-Saucedo et al, 2012). In the present work, we used a high-speed camera (Phantom V2011) to examine whether there is any significant difference in the gas dispersion properties near the porous plate between MCHM and MIBC.…”

Section: Dispersion Of Airmentioning

confidence: 94%

“…The importance of the gas dispersion properties (i.e., bubble size, number of bubble, gas hold up, bubble surface area flux) on flotation have been advocated by many researchers (Ahmed and Jameson, 1985;Gorain et al, 1997;Finch et al, 2000;Yoon, 2000;López-Saucedo et al, 2012). More specifically, several studies found a close relation between bubble surface area flux and gas hold up with the flotation performance (Gorain et al, 1997;Finch et al, 2000;López-Saucedo et al, 2012).…”

Section: Dispersion Of Airmentioning

confidence: 99%

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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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Section: Dispersion Of Airmentioning

confidence: 94%

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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“…4 − 8 It was documented that the bubble surface area flux has a direct relationship with the recovery of hydrophobic particles (true flotation), which is affected by the superficial gas velocity and bubble size distribution in column flotation. 3 , 9 , 10 It is reported that gas holdup is correlated with bubble surface flux. 10 , 11 Unlike the bubble surface flux, the easy-to-measure gas holdup can be used in the control and optimization of industrial flotation machines.…”

Section: Introductionmentioning

confidence: 99%

“… 3 , 9 , 10 It is reported that gas holdup is correlated with bubble surface flux. 10 , 11 Unlike the bubble surface flux, the easy-to-measure gas holdup can be used in the control and optimization of industrial flotation machines. 12 , 13 …”

Section: Introductionmentioning

confidence: 99%

Exploring the Relationships between Gas Dispersion Parameters and Differential Pressure Fluctuations in a Column Flotation

Zhou

Sun

et al. 2021

ACS Omega

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Flotation separation, which is the most important mineral beneficiation technique, is dependent on gas dispersion (hydrodynamic conditions). Thus, many investigations have focused on the precise determination of hydrodynamic conditions such as Reynolds number of the bubbles, bubble velocity, and bubble diameter. However, few studies have examined their relationships with pressure fluctuations in a column flotation. This study introduced the differential pressure fluctuations as an actual variable that could be considered to determine the collection zone’s hydrodynamic conditions in a cyclonic microbubble flotation column. In general, the outcomes indicated that superficial gas velocity had the most substantial relationship with the differential pressure fluctuations among other flotation factors (such as pump speed, superficial gas velocity, superficial water velocity, and frother dosage). Furthermore, a high coefficient of determination ( R 2 > 0.77) for the equation generated to assess the relationships demonstrated that differential pressure fluctuations could be used as a promising tool to determine the hydrodynamic parameters’ characteristics in the flotation columns.

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“…Gas holdup is defined as the volumetric fraction (or percentage) occupied by gas at any point in a column (Finch and Dobby, 1990). Some studies have reported that gas holdup affected both the recovery and grade in industrial and pilot-scale flotation columns (Leichtle, 1998;López-Saucedo et al, 2012). These studies reported a linear relationship between gas holdup and recovery.…”

mentioning

confidence: 99%

Prediction of gas holdup in a column flotation cell using computational fluid dynamics (CFD)

Mwandawande

Akdogan

Bradshaw

et al. 2019

J. S. Afr. Inst. Min. Metall.

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Gas dispersion in column flotation and its effect on recovery and grade

Cited by 12 publications

References 16 publications

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

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

Exploring the Relationships between Gas Dispersion Parameters and Differential Pressure Fluctuations in a Column Flotation

Prediction of gas holdup in a column flotation cell using computational fluid dynamics (CFD)

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