Characterization of the wettability of solid particles by film flotation 1. Experimental investigation

Fuerstenau, D.W.; Diao, J.; Williams, Mark C.

doi:10.1016/0166-6622(91)80273-q

Cited by 70 publications

(31 citation statements)

References 24 publications

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“…This yields surface tension-vs-percent hydrophobic fraction distribution diagrams, from which the distribution and the mean critical wetting tension of the particles can be determined. Careful experimentation showed that virtually identical results are obtained with aqueous solutions of methanol, ethanol, propanol, tertiary butanol, and acetone 18,19) . Since interfacial forces are so dominant, particle size does not have an appreciable effect, as found for 425 × 300-m, 300 × 212, 212 × 150, 150 × 106, 106 × 75 and minus 75 × 53-m Cambria #78 coal particles 19) .…”

Section: Film Flotationmentioning

confidence: 95%

“…Careful experimentation showed that virtually identical results are obtained with aqueous solutions of methanol, ethanol, propanol, tertiary butanol, and acetone 18,19) . Since interfacial forces are so dominant, particle size does not have an appreciable effect, as found for 425 × 300-m, 300 × 212, 212 × 150, 150 × 106, 106 × 75 and minus 75 × 53-m Cambria #78 coal particles 19) . Because of the heterogeneity of coal, the wetting behavior of particles in the sample may change continuously from that of hydrophobic organic materials to those of hydrophilic inorganic matter.…”

Section: Film Flotationmentioning

confidence: 95%

“…These two figures clearly show the heterogeneous nature of the surface of coal particles. In contrast, ideal homogeneous particles will have the same critical wetting surface tension, that is, the cumulative plot is a vertical line that gives the sharp demarcation between sink and float surface tension 19) . From such a distribution, four wetting parameters have been defined.…”

Section: Film Flotationmentioning

confidence: 99%

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Characterization of the Wetting and Dewetting Behavior of Powders

Chander

Hogg

Fuerstenau³

2007

KONA

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Section: Film Flotationmentioning

confidence: 95%

Section: Film Flotationmentioning

confidence: 95%

Section: Film Flotationmentioning

confidence: 99%

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Characterization of the Wetting and Dewetting Behavior of Powders

Chander

Hogg

Fuerstenau³

2007

KONA

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“…Under the influence of appropriate chemicals, the surfaces of some mineral particles can be chemically modified. The wettability of mineral surfaces controlled by the solution surface tension is known to be an important parameter which affects many technological processes [8].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Critical Parameters for Wettability-Based Processes in Mineral Processing

Özkan

Duzyol

2015

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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This paper presents an evaluation of critical parameters for wettability-based processes such as flotation, shear flocculation, oil agglomeration and liquid-liquid extraction in mineral processing. 'The critical surface tension of wetting ( c )' value of minerals has crucial importance in these processes. Also, 'the critical solution surface tension for oil agglomeration ( c-a )' and 'the critical solution surface tension for liquidliquid extraction ( c-e )' parameters, which are slightly higher than the  c value of the mineral, exist for achieving the oil agglomeration and liquidliquid extraction techniques. In the case of three-phase systems composed of solid, liquid/medium and oil such as oil agglomeration and liquidliquid extraction techniques, there is a second critical parameter based on the oilliquid interfacial tension (γ OL ) which are 'the critical oilliquid interfacial tension for oil agglomeration, γ cOLa ' and 'the critical oilliquid interfacial tension for liquidliquid extraction, γ cOLe ', respectively.

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“…The benefit for CSG is that water production rates may be improved in the initial stages if the near wellbore is water-wet. Surface modification using oxidants has also been applied in coal flotation studies (Fuerstenau et al, 1991;Fuerstenau et al, 1983;Kilau and Pahlman, 1987;Polat et al, 2003) and also as a means of impurity removal or improved surface visualisation (Boron et al, 1981;Cho et al, 1983;Rhoads et al, 1983;Vasilakos and Clinton, 1983;Ward, 1974). Additionally, Sadler and Chang (1988) used heated sodium hydroxide (NaOH) to dissolve the coal around the cleat walls to increase width and improve absolute permeability.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Water Occlusion on Gas Production in Coal

Mahoney¹

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Relative permeability is of fundamental importance to understand and model the flow of hydrocarbons and water in porous rocks including coal, and thus relative permeability is critical in prediction of commercial gas and water production rates from coal seam gas (CSG) reservoirs.Despite relative permeability being a primary parameter for determining reservoir performance, the fundamental physics of how or where water may occlude or block cleats in a coal seam, and thereby interfere with gas production rates, is not fully understood. This project aims to improve the understanding of water occlusion in CSG reservoirs through fluid experiments with model coal cleats and to evaluate the potential impact of water occlusion of reservoir performance.The aim of this thesis is to develop a new experimental methodology that can be used identify the main control factors that affect wettability in coal. There are two key objectives to satisfy the thesis aim 1) develop methods to make artificial channels in coal and 2) create a world first microfluidic device that assess micro scale flow through coal cleats, known as the cleat flow cell (CFC). The initial features to be evaluated will include: lithotype, surface roughness, surface composition, specifically chemical functional groups and pressure. oxygen plasma with a photolithography process to make the desired pattern on coal surface, UV Laser ablation, mechanical machining, a mechanical scratch technique, and a chemical etching technique that used potassium permanganate (KMnO4). Characteristics of the artificial channels were assessed using a surface step profiler, scanning electron microscopy, micro-Raman spectroscopy and light microscopy. A sixth methodology to create an artificial channel using pressed coal powder was also used as a means of evaluating the influence of the surface chemistry on the wetting behaviour, without the interference of surface topography.In Chapter Five, I report the effect of rank and lithotype on the wettability of coal in microfluidic experiments in two types of artificial microchannels; (1) reactive ion etched (RIE) channels and (2) die-cast channels prepared by pressing powdered lithotype concentrates. Contact angles and entry pressures of air and water in the artificial cleats were measured in imbibition experiments performed iii with a CFC. The relative contact angles measured in CFC imbibition experiments were in the range 110 -140° in the RIE channels and 85°-115° in the pressed discs, which are larger contact angles than measured on the flat bulk surfaces of these samples by the conventional sessile drop technique (58°-85°). The CFC observations show that the surface roughness of coal in inertinite-rich dull bands effects contact angle and the entry pressure of the air-water interface differently to the vitrinite-rich bright bands, with both lithotypes presenting unique wetting states. Drainage experiments revealed a thin residual water film on the inertinite cleat wall, not observed on the smoother vitrinite channel. were hydr...

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Characterization of the wettability of solid particles by film flotation 1. Experimental investigation

Cited by 70 publications

References 24 publications

Characterization of the Wetting and Dewetting Behavior of Powders

Characterization of the Wetting and Dewetting Behavior of Powders

Evaluation of Critical Parameters for Wettability-Based Processes in Mineral Processing

The Effect of Water Occlusion on Gas Production in Coal

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