Characterization of Coal Oxidation and Coal Wetting Behavior by Film Flotation

Fuerstenau, D.W.; Diao, J.

doi:10.1080/07349349208905189

Cited by 32 publications

(13 citation statements)

References 20 publications

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“…froth flotation, oil agglomeration, dust abatement, and preparation of coal-water slurries (Arnold and Aplan, 1989;Fuerstenau and Diao, 1992;Laskowski, 1995).…”

Section: Introductionmentioning

confidence: 98%

“…He concluded that the contact angles depend on the hydrogen and oxygen content of the coal. Keller (1987) summarized literature data (Fuerstenau and Diao, 1992;Murata, 1981) on surface properties of coal-water-air systems. Chi et al (1988) found that the contact angle in a CO 2 -water-coal system increases with pressure in the range from atmospheric up to 6.2 MPa.…”

Section: Introductionmentioning

confidence: 99%

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Effect of coal petrology and pressure on wetting properties of wet coal for CO2 and flue gas storage

Kaveh

Wolf

Ashrafizadeh

et al. 2012

International Journal of Greenhouse Gas Control

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“…froth flotation, oil agglomeration, dust abatement, and preparation of coal-water slurries (Arnold and Aplan, 1989;Fuerstenau and Diao, 1992;Laskowski, 1995).…”

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Effect of coal petrology and pressure on wetting properties of wet coal for CO2 and flue gas storage

Kaveh

Wolf

Ashrafizadeh

et al. 2012

International Journal of Greenhouse Gas Control

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“…There is evidence from previous work that the low-temperature oxidation of a coal has a deleterious effect on its dewatering response [20,21]. A possible mechanism for this effect is a reduction in Downloaded by [Heriot-Watt University] at 15:17 03 January 2015 hydrophobicity which occurs as a result of an increase in the surface concentration of carbon atoms that are bonded to oxygen atoms.…”

Section: The Extent Of Coal-water Interactionsmentioning

confidence: 93%

“…NMR measurements on fine coal specimens show that the average relaxation time for the interparticle water increases markedly as the content of this water increases but, at water contents typical of those in desaturated filter cakes (i.e., [20][21][22][23][24][25] wt %), is still much shorter than the relaxation time for bulk water. The relaxation process becomes faster with both decreasing particle size and increasing breadth of the Downloaded by [Heriot-Watt University] at 15:17 03 January 2015 size distribution.…”

Section: Nmr Relaxation Behaviourmentioning

confidence: 99%

Advances in the Fundamentals of Fine Coal Filtration

Bourgeois

Barton

1998

Coal Preparation

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The fundamental principles governing the filtration of fine (nominally -0.5 mm) coal are not well understood. This has recently been recognised by the Australian coal industry as a major hurdle to significantly improving dewatering technology and performance. This study quantifies and compares the respective influences of filter cake microstructure, and coal surface and bulk properties on the vacuum filtration of fine bituminous coal slurries. It is shown that filter cake microstructure is the dominant factor, particularly in determining the kinetics of cake formation and desaturation. Although variations in coal properties probably have little effect on the filtration kinetics, they can significantly influence residual cake moisture. Moreover, the results obtained in this study indicate that there does not exist a single microstructure capable of providing both a high filtration rate and a low product moisture. Such a result is expected to influence future dewatering research efforts and possibly drive the design of new fine coal filtration technologies.

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“…A great deal of heat is released during spontaneous combustion, leading to a serious oxidation of coal particles. Coal floatability and recovery decreased significantly after oxidation and cannot even be economically recovered via a traditional flotation method [6][7][8][9][10][11]. It is well known that oily collectors have been always used for coal flotation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heating Oxidation on the Surface/Interface Properties and Floatability of Anthracite Coal

Rong

Wang

et al. 2019

Processes

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Oxidation processes of coal surfaces are both fundamental and interesting from academic and engineering points of view. In this work, we comprehensively analyzed the mechanism of heating oxidation at 200 • C on the surface/interface characters and the floatability of anthracite coal. The variations of surface/interface characters were studied using SEM (scanning electron microscopy), FTIR (Fourier transform infrared spectroscopy), and XPS (X-ray photoelectron spectroscopy). The floatability was further identified using Induction Time and Bubble-Particle Wrap Angle. It was found that, after heating oxidation at 200 • C, both surface ravines and oxygen-containing groups were increased. The degradation of hydroxyl on anthracite could be neglected during the heating, while the oxidation of hydrocarbon chains dominated the balance of hydrophobicity and hydrophilicity on coal surface. The induction time significantly increased from 200 ms to 1200 ms and 2000 ms after 10 h and 20 h of heating oxidation at 200 • C, respectively. Additionally, raw coal exhibited the fastest kinetics of bubble-particle attachment and the largest wrap angle, directly proving that the floatability decreased after oxidation.

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Characterization of Coal Oxidation and Coal Wetting Behavior by Film Flotation

Cited by 32 publications

References 20 publications

Effect of coal petrology and pressure on wetting properties of wet coal for CO2 and flue gas storage

Effect of coal petrology and pressure on wetting properties of wet coal for CO2 and flue gas storage

Advances in the Fundamentals of Fine Coal Filtration

Effect of Heating Oxidation on the Surface/Interface Properties and Floatability of Anthracite Coal

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