Improving the adsorption of oily collector on the surface of low-rank coal during flotation using a cationic surfactant: An experimental and molecular dynamics simulation study

Xia, Yangchao; Zhang, Rui; Xing, Yaowen; Gui, Xiahui

doi:10.1016/j.fuel.2018.07.059

Cited by 200 publications

(56 citation statements)

References 43 publications

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“…A homemade induction time measuring system [21,22] was employed for determining the induction time between bubble and anthracite coal particles. This system contains a controller, high-speed camera, micro-syringe, micro-displacement sensor, actuator, illumination device, measuring cell, etc., as shown in Figure 1.…”

Section: Induction Time Testmentioning

confidence: 99%

“…Given that the hydrodynamics and bubble-particle diameter were kept constant in all tests, the attachment angle kinetics was only determined by the competition between bubble-particle attachment and detachment efficiency, which is more suitable to describe the floatability compared with the induction time. The Bubble-particle warp angle had been used by Xia et al [22,27] to confirm the floatability of low-ranked coal in the presence of different collectors. Raw coal clearly exhibited the fastest kinetics of the bubble-particle wrap angle compared with LH-10 and LH-20.…”

Section: Effect Of Heating Oxidation At 200 °C On the Floatability Ofmentioning

confidence: 99%

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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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Section: Induction Time Testmentioning

confidence: 99%

Section: Effect Of Heating Oxidation At 200 °C On the Floatability Ofmentioning

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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“…However, a series of studies has shown that low-rank coals suffer from poor otation efficiency with common oily collectors at an economical dose. [2][3][4][5] Many polar oxygen-containing functional groups, such as carboxyl, phenolic and carbonyl, which have an affinity with water molecules via hydrogen bonding, are present on low-rank coal. Their presence results in poor hydrophobicity, deteriorating adhesion and spread of oily collectors onto coal surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, mixtures of hydrocarbon oils and polar reagents have been shown to be effective options to increase the collecting efficiency of low-rank CFs at a low dose. 2,5,10,14,15 Vamvuka and Agridiotis 16 employed a mixture of dodecylamine and kerosene as the collector to oat lignite of size À300 AE 75 mm, and found that higher otation selectivity and recovery could be achieved using this mixture. Xia et al 14 found that dodecane was adsorbed primarily on hydrophobic sites of the lignite surface whereas 4-Dodecylphenol was adsorbed primarily on the hydrophilic sites of the lignite surface.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of floatability of low-rank coal using oxidized paraffin soap

Gao

Wang

et al. 2020

RSC Adv.

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“…Meanwhile, the bubble-particle attachment is governed by surface morphological characteristics, such as the shape, surface roughness, and pores of particles [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Comminution Methods on Low-Rank Coal Bubble–Particle Attachment/Detachment: Implications for Flotation

et al. 2019

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The floatability of fine low-rank coal particles can be greatly influenced by their morphological characteristics, such as shape and surface roughness. In this study, the attachment efficiency and detachment amplitude of fine low-rank coal particles produced by various comminution methods onto/from the bubble surface were investigated using homemade bubble-particle wrap angle and bubble-particle attachment/detachment testing systems. Results showed that the length-diameter ratio of rod-milled products was smaller than that of crushed products. The wrap angle of particles obtained by the crushed method was larger than that obtained by the rod-milled method, i.e., particles with greater length-diameter ratio showed higher attachment efficiency onto the bubble surface. Meanwhile, particles with greater length-diameter ratio exhibited a larger detachment amplitude, which suggests that it is more difficult to be detached from the bubble surface. However, rod-milled products showed lower attachment onto the bubble surface. The flotation test confirmed that the floatability ratio of crushed products was higher than that of rod-milled products, consistent with evidence from experimental analyses. This study provides a fundamental understanding of particle shapes for low-rank coal flotation by a novel research method combining the attachment efficiency and detachment amplitude of bubble-particle combinations.

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Improving the adsorption of oily collector on the surface of low-rank coal during flotation using a cationic surfactant: An experimental and molecular dynamics simulation study

Cited by 200 publications

References 43 publications

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

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

Enhancement of floatability of low-rank coal using oxidized paraffin soap

Effect of Comminution Methods on Low-Rank Coal Bubble–Particle Attachment/Detachment: Implications for Flotation

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