Enhancing low-rank coal flotation using a mixture of dodecane and n-valeric acid as a collector

Liu, Zechen; Liao, Yinfei; Wang, Yongtian; An, Maoyan; Lai, Qingteng

doi:10.1080/19392699.2019.1579202

Cited by 16 publications

(10 citation statements)

References 28 publications

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“…Different from the viewpoints of former scholars [21,23,27,45], we proposed that there might be a relatively ordered "supramolecular structure" when OA-D molecules were absorbed on the low rank coal surface. Figure 9 shows the formation process of the supramolecular system.…”

Section: Synergetic Mechanismmentioning

confidence: 59%

“…For poor floatability of coal, it was accepted that the polar head of the collector interacted with its polar functional groups on the surface. Compared to the single heteropolar/nonpolar reagent, mixtures of heteropolar reagents and nonpolar materials, namely compound/mixed collectors, including oxidized diesel, biodiesel, waste vegetable oil, and polar/nonpolar mixture [18][19][20][21], have all been suggested to be more effective in facilitating the recovery of low rank/oxidized coal. It was indicated that the compositions of some collectors were more complex with polar groups, and the low rank/oxidized coal recovery was increased by the synergistic effect of different polar oil molecules [22].…”

Section: Introductionmentioning

confidence: 99%

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Improving Low Rank Coal Flotation Using a Mixture of Oleic Acid and Dodecane as Collector: A New Perspective on Synergetic Effect

Liao

Cao

et al. 2021

Processes

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The mixed collector can improve low rank coal flotation efficiency, but its synergistic mechanism needs to be further explored. In this paper, oleic acid-dodecane (OA–D), oleic acid (OA), and dodecane (D) were employed to treat the low rank coal for revealing new synergistic mechanism of the mixed collector. First the surface free energy of the coal, the surface free energy of coal–water and coal–water–coal were calculated. Then wetting heat measurement, X-Ray Photoelectron Spectroscopy (XPS) and FTIR were used to analyze synergistic mechanism of the mixed collector in depth. The results showed that OA–D obtained a higher combustible recovery than using OA and D, respectively. The essence of synergetic mechanism of OA–D was that they formed a relatively ordered “supramolecular structure” on the low rank coal surface, especially there were hydrophobic and van der Waals forces between the oleic acid chain and the dodecane chain that can promote the formation of a continuous collector film.

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Section: Synergetic Mechanismmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Improving Low Rank Coal Flotation Using a Mixture of Oleic Acid and Dodecane as Collector: A New Perspective on Synergetic Effect

Liao

Cao

et al. 2021

Processes

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“…Zhen et al found that adding a certain amount of dodecyl trimethyl ammonium chloride (DTAC) can effectively enhance the hydrophobicity of low-rank coal and reduce the induction time between coal particles and bubbles. Similar researches indicated that the mixed collector of dodecane and n -pentanoic acid can also obtain shorter induction time and higher coal hydrophobicity . Jia et al observed that when dodecane is mixed with a small amount of tetrahydrofurfuryl esters (THF) as a collector, the surface hydrophobicity of low-rank coal can be significantly improved.…”

Section: Introductionmentioning

confidence: 91%

“…Similar researches indicated that the mixed collector of dodecane and n-pentanoic acid can also obtain shorter induction time and higher coal hydrophobicity. 24 Jia et al 25 observed that when dodecane is mixed with a small amount of tetrahydrofurfuryl esters (THF) as a collector, the surface hydrophobicity of low-rank coal can be significantly improved. A higher recovery was obtained using the mixture of dodecyl trimethylammonium bromide and diesel as the collector in low-rank coal flotation.…”

Section: Introductionmentioning

confidence: 99%

Detachment Force of Air Bubbles Detached from Low-Rank Coal Surface in the Presence of Adsorbed Oleic Acid–Dodecane Collector Mixture

Liao

Ren

et al. 2021

ACS Omega

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It is well known that mixed collectors can effectively strengthen the flotation of low-rank coal. However, less concern has been paid to the detachment of low-rank coal flotation using mixed collectors. In this study, the force of air bubble detachment from low-rank coal surface treated by oleic acid (OA), dodecane (D), and oleic acid–dodecane (OA–D) collector mixture was investigated using microforce balance. The results showed that the process of bubble detachment from the low-rank coal surface was divided into three stages: relaxation stage, stretching stage, and sliding stage. The equilibrium contact angle and critical contact angle were the transition points between different stages. The order of detachment force required for bubble detachment from the surface of low-rank coal was OA–D > OA > D, indicating a synergistic effect between OA and D. Based on the three parameters of equilibrium contact angle, critical contact angle, and contact line length, a theoretical model was proposed to calculate the detachment force. The calculated results were in agreement with the measured results.

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“…It is well known that the role of a collector is to adsorb selectively on the useful mineral (rock) grains to change the surface to sufficiently hydrophobic one, so that they would attach to the gas bubbles which transport them up to the surface where they are collected in the froth. In the minerals processing the froth flotation method is a still widely applied technique for separating particles possessing different chemical and physical characteristics (Drzymała, 1994;Drelich, 2001; Fuerstenau and Somasundaran, 2003;Sadowski and Polowczyk, 2004;Fuerstenau et al 2007;Bastrzyk et al, 2008;Szymańska and Sadowski, 2010;Didyk and Sadowski, 2012;Gao et al, 2015;Kowalczuk, 2015;Kowalczuk et al, 2016;Kowalczuk, et al 2017;Drzymała et al, 2016;Drelich, 2018;Gao et al, 2015;Liu, et al 2019). The the process is thermodynamically described by the Dupre's equation (Adamson and Gast, 1997): particle/water « water/gas ® particle/gas "# + $# ® "# ∆ = "# − ) $# + "$ +…”

Section: Introductionmentioning

confidence: 99%

Magnetic field effects on surfactants adsorption on the solid surface as regards of its wettability

Hołysz¹,

Chibowski²,

Terpiłowski³

2020

Physicochem. Probl. Miner. Process.

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The static magnetic field MF (0.44 T) effects on the adsorption of three surfactants: cationic bromide (DTAB) and hexadecyltrimethylammonium bromide (CTAB), and anionic sodium dodecylsulfate (SDS) from their 10-3 M solutions were studied on bare and low-temperature air plasma treated glass plates. The surface properties of the adsorbed surfactants layers were determined via the water advancing and receding contact angles measurements and then calculation of the apparent surface free energy. An optical profilometer was used to determine the structure and topography of the adsorbed layers. The DTAB and SDS concentrations were below their critical micelle concentration and that of CTAB very close to its cmc. The results showed that in the case of DTAB solution (much below its cmc) a small decrease in the contact angle appeared while in CTAB (close to its cmc) an increase in the contact angle value was observed if adsorbed in the MF presence. Quite good reproducibility of the contact angle values was obtained. This was not the case for the SDS solution where the contact angle values were scattered. The reason was that the anionic surfactant did not adsorb homogeneously on the negatively charged glass surface. The contact angles and the calculated values of the work of water spreading clearly show that MF influences the structure of the surfactant adsorbed layer which was also supported by the optical profilometry images.

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Enhancing low-rank coal flotation using a mixture of dodecane and n-valeric acid as a collector

Cited by 16 publications

References 28 publications

Improving Low Rank Coal Flotation Using a Mixture of Oleic Acid and Dodecane as Collector: A New Perspective on Synergetic Effect

Improving Low Rank Coal Flotation Using a Mixture of Oleic Acid and Dodecane as Collector: A New Perspective on Synergetic Effect

Detachment Force of Air Bubbles Detached from Low-Rank Coal Surface in the Presence of Adsorbed Oleic Acid–Dodecane Collector Mixture

Magnetic field effects on surfactants adsorption on the solid surface as regards of its wettability

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