Preparation of a coal surface for contact angle measurements

Drelich, Jaroslaw; Laskowski, J.; Pawlik, Marek; Veeramasuneni, S.

doi:10.1163/156856197x00219

Cited by 55 publications

(38 citation statements)

References 21 publications

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“…23 As mentioned earlier, characterization of a specimen's wetting requires polishing to a mirrorlike surface. 24 However, any research stemming toward the development of correlations between contact angles and flotation performance will also require preparation of specimen surface topography that reflects the surfaces of particles.…”

Section: Granulated Mineralsmentioning

confidence: 99%

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Meaningful Contact Angles in Flotation Systems: Critical Analysis and Recommendations

Drelich

MarmurAbraham

2017

Surface Innovations

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2Froth flotation was invented in the nineteenth century. Since then, many laboratories have been committed to both fundamental and applied research on the collection of particles by dispersed gas bubbles in aqueous solutions of electrolytes, in particular those working on the processing of natural resources. However, despite the tremendous progress made in the characterization of particles and their surfaces and understanding particle-bubble interactions, supported by detailed recordings of gas bubble attachments to both bulk specimens and particles, the flotation process remains poorly correlated with the wetting characteristics of particle surfaces. In fact, the contact angles used frequently to describe the wettability of mineral surfaces remain among the most controversial, misunderstood and misinterpreted values in mineral processing literature.

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Section: Granulated Mineralsmentioning

confidence: 99%

“…24 Specimens with small and little inclusions of other minerals and prepared with as little roughness as possible should be selected for contact angle measurements. 25 There is also a group of minerals that are soluble in water.…”

mentioning

confidence: 99%

Meaningful Contact Angles in Flotation Systems: Critical Analysis and Recommendations

Drelich

MarmurAbraham

2017

Surface Innovations

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“…From the common knowledge it follows that interfacial angle Θ [7][8][9] is one of the main indicators of the coal-surfactant solution-gas or the solid-surfactant solution-air interfacial interactions. The following factors influence the choice of this variable as the main for the studies [4], [5]: 1) the structure of the study solid: porosity, coal heterogeneity; 2) physical and chemical properties of the study liquid; 3) the goals and objectives of the process under consideration.…”

Section: Research Materials and Methodsmentioning

confidence: 99%

“…The interfacial angle Θ is the main indicator characterizing the interfacial interactions, the efficiency of many processes, both in mining and in other industries. The angle Θ variations being studied; the possible conditions for the efficient process control are determined [6][7][8][9][10].…”

Section: Research Materials and Methodsmentioning

confidence: 99%

Study of the Change in the Coal-and-Liquid-and-Gas Interfacial Angle

Elkin

Meshkov²

2018

E3S Web Conf.

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Abstract. The use of surfactants has a significant impact on the safety of mining operations in order to prevent dynamic processes, prevent dust. The interfacial angle is the main indicator characterizing the interfacial interactions for heterogeneous multicomponent solid bodies, coal and solutions. The problem of development of modern methods for determining the interfacial angle at the coal-water-gas boundary is considered. The results of the research study of the change in the coalliquid-gas interfacial angle are presented. The influence of various coal properties and characteristics on the interfacial angle value is shown. The influence of the interfacial angle on wetting and filtration processes, the features of the experimental methods for the interfacial angle determination are shown. A model of the coal surface consisting of four main components is proposed. The main attention is paid to the moisture content of coal and capillaries as the main factors determining the properties of coal. An analytical method for determining the interfacial angle of coalwater-gas is proposed.

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“…Polishing with the series of abrasive papers and alumina powder was used to flatten and smooth the coal surface. Water washing and ultrasonic cleaning of coal specimens followed each step of the polishing procedure (9,10). Ultrasonic cleaning as well as fine polishing with the fibrous cloth removed particles of abrasive material and abraded coal powder left on the coal specimen surface after polishing.…”

Section: Coal Samplesmentioning

confidence: 99%