Foaming mechanisms in surfactant free particle suspensions

Bindal, Sunil K.; Sethumadhavan, Gopi; Nikolov, Alex; Wasan, Darsh T.

doi:10.1002/aic.690481020

Cited by 47 publications

(38 citation statements)

References 24 publications

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“…Molecular solutions of compounds such as diacetone alcohol and ethyl acetal (compounds that do not alter solutions surface tension) have been shown to produce adequate froth with fine coal (hydrophobic) particles (Lekki and Laskowski, 1975). Three-phase froth has also been generated by aerating a suspension of clean hydrophilic nanosized silica particles in distilled water (Bindal et al, 2002). It was submitted that the foaminess observed was directly proportional to particle concentration and inversely proportional to particle size, and the self organization of the colloidal particles in to layered structure between gas bubbles provided a barrier against coalescence of bubbles, thereby stabilizing the foam lamella (Bindal et al, 2002).…”

Section: Natural Hydrophobic Responsecontrasting

confidence: 39%

“…Three-phase froth has also been generated by aerating a suspension of clean hydrophilic nanosized silica particles in distilled water (Bindal et al, 2002). It was submitted that the foaminess observed was directly proportional to particle concentration and inversely proportional to particle size, and the self organization of the colloidal particles in to layered structure between gas bubbles provided a barrier against coalescence of bubbles, thereby stabilizing the foam lamella (Bindal et al, 2002). All this is to submit that, in two-phase froth, lowering of surface tension is a prerequisite, while this is not compulsory to achieve a tangible threephase froth; fine particle stabilization will suffice.…”

Section: Natural Hydrophobic Responsementioning

confidence: 47%

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Investigation of froth flotation for beneficiation of printed circuit board comminution fines

Ogunniyi

Vermaak

2009

Minerals Engineering

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a b s t r a c tFroth flotation for beneficiation of printed circuit board comminution fines was investigated in this work, via reverse flotation under a scheme described as natural hydrophobic response. With no reagents, the scheme employed variation of kinetic parameters of airflow rate and impeller speed to optimize metallic enrichment of the sink. The impeller energy and aeration rate required to keep the pulp in suspension and avoid excessive turbulence were found to be much lower compared with conventional mineral flotation. The natural hydrophobic response was found to exist, and stable froth was observed even without the use of any frother. It was submitted that the dynamic froth stability observed is due to fine particle stabilization. Mass pulls obtained were high and cumulative mass pull under the varying kinetic regimes were found to fit very well to the general first order kinetics. The extents of fit, the sink enrichment and the recovery in respect of metallic values were assessed to evaluate the beneficiation performance. Many of the metallic elements were found to concentrate into the sink, while some prefer the froth phase. Notably, gold and palladium were among the best recovered to the sink; with about 64% recovery at enrichment ratio of 3.1 (676 ppm actual assay) for Au. The flotation scheme proved effective for PCB comminution fines, and performance improvement also looks very feasible.

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Section: Natural Hydrophobic Responsecontrasting

confidence: 39%

Section: Natural Hydrophobic Responsementioning

confidence: 47%

Investigation of froth flotation for beneficiation of printed circuit board comminution fines

Ogunniyi

Vermaak

2009

Minerals Engineering

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“…Wasan and co-workers have also investigated the fundamental mechanism for foaming and antifoam mechanisms in waste slurries (Wasan et al 2004;Bindal et al 2001Bindal et al , 2002. It was determined that small insoluble particles that attach to bubbles can inhibit the coalescence of bubbles by creating particle-stabilized foam lamellae that create stable foams.…”

Section: 10contrasting

confidence: 39%

An Approach to Understanding Cohesive Slurry Settling, Mobilization, and Hydrogen Gas Retention in Pulsed Jet Mixed Vessels

Gauglitz¹,

Wells²,

Fort³

et al. 2009

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“…When appropriate concentrations of surface-active agents are present in the liquid layer, they facilitate foam production by lowering the surface tension of the solution with respect to water (Glaser et al, 2007;Davenport et al, 2008). Finally, hydrophobic solids are thought to stabilize the foam by pre-venting or reducing liquid drainage from the foam and holding the bubbles in a stabilized structure (Bindal et al, 2002;Horozov, 2008;Heard et al, 2009).…”

supporting

confidence: 41%

Impact of Dietary Carbohydrate and Protein Source and Content on Swine Manure Foaming Properties

Weelden¹,

Andersen²,

Kerr³

et al. 2016

Trans. ASABE

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Diet ingredients are thought to contribute to foaming problems associated with swine manure stored in deeppit systems. Two experiments explored the impact of protein and carbohydrate sources and levels in swine diets on the physicochemical properties, methane production potential, and foaming potential of swine manure. The first experiment was specific to protein and evaluated the impact of dietary protein level and source on manure properties, while the second experiment focused on evaluating the impact of different dietary carbohydrate sources on manure foaming properties. Manure from the animals was tested for total and volatile solids, methane production rate and biochemical methane potential, surface tension, foaming capacity and stability, and microbial community structure. No single diet yielded manure with all of the anticipated qualities associated with foaming manure. However, manure collected from pigs fed diets containing soy hulls and distillers dried grains with solubles (DDGS) exhibited higher methane production rates (0.95 Â±0.20 and 0.96 Â±0.20 L CH 4 kg -1 VS, respectively) and biochemical methane potential (322 Â±25 and 269 Â±22 mL CH 4 g -1 VS, respectively) when compared to manure obtained from pigs fed the other diets. Additionally, the results showed that both protein level and source exhibited greater influence over the microbial community than carbohydrate source, with manipulations in the protein diet leading to positive correlations with specific microbial community and higher methane production rates, foaming capacity, and foam stability. In this study, these parameters appeared to be tied to higher levels of corn, or corn protein, in the diet. Although some of the microbial community was explained by diet, this study also demonstrated that factors other than diet have significant influence on microbial community. RightsWorks produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted. Authors

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Foaming mechanisms in surfactant free particle suspensions

Cited by 47 publications

References 24 publications

Investigation of froth flotation for beneficiation of printed circuit board comminution fines

Investigation of froth flotation for beneficiation of printed circuit board comminution fines

An Approach to Understanding Cohesive Slurry Settling, Mobilization, and Hydrogen Gas Retention in Pulsed Jet Mixed Vessels

Impact of Dietary Carbohydrate and Protein Source and Content on Swine Manure Foaming Properties

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