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

An, Maoyan; Liao, Yinfei; Cao, Yijun; Hao, Xiaodong; Ma, Longfei

doi:10.3390/pr9030404

Cited by 12 publications

(5 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effect of OA–D on LRC surface hydrophobicity improved the adhesion strength and stability between bubbles and the LRC surface so as to reduce the particle detachment probability and increase the flotation recovery. This has been confirmed in our previous flotation test, , in which the best flotation result was obtained using OA–D as the collector at the dosage of 3 kg/t, and the combustible matter recovery was 25.77 and 48.86% higher than that of OA and D, respectively. Therefore, the results of detachment force and energy measurements in this study are consistent with those of hydrophobicity measurement and flotation test.…”

Section: Results and Discussionsupporting

confidence: 83%

“…Thus, the water molecules were accelerated to leave the LRC surface, which increased the lipophilicity and hydrophobicity of the LRC surface. 10 A new synergistic mechanism of oleic acid–dodecane (OA–D) mixed collectors was proposed by An et al 11 On a relatively ordered “supramolecular structure” on the LRC surface, especially, there were hydrophobic and van der Waals forces between the OA chain and the D chain that can promote the formation of a continuous collector film. Although enhancing LRC flotation using a mixed collector has been widely studied, its effect on the bubble–particle detachment process is less-studied, especially the energy feature during the detachment process.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Energy Feature of Air Bubble Detachment from a Low-Rank Coal Surface in the Presence of a Dodecane–Oleic Acid Collector Mixture

Liao

Yang

et al. 2022

ACS Omega

Self Cite

View full text Add to dashboard Cite

It has been generally proved that mixed collectors can enhance the flotation of low-rank coal (LRC). However, the inhibition effect of mixed collectors on the detachment between particles and bubbles is still unclear. In this paper, the energy feature of air bubble detachment from the LRC surface in the presence of dodecane (D), oleic acid (OA), and the mixture of dodecane and oleic acid (OA–D) was studied. The effect of collectors on the LRC surface property was analyzed using contact angle measurement, X-ray photoelectron spectroscopy, and wetting heat measurement. The force and displacement during the detachment process were measured synchronously using microforce balance. The results showed that the collector treatment increased the C–C/C–H content and decreased the content of oxygen-containing groups on the LRC surface. The synergistic effect between OA and D enabled the mixed collector to exhibit higher contact angle and wetting heat. Bubble detachment from the LRC surface can be divided into two stages: bubble stretching and bubble sliding, which corresponded to activation energy and detachment work, respectively. The activation energy and detachment work decreased in the same order of OA–D > OA > D, indicating that the mixed collector OA–D increased the energy of bubble detachment from the LRC surface and enhanced the adhesion strength. The theoretical detachment work was calculated, and the calculated results were in agreement with the measured results. This research provides a new perspective on the mechanism of LRC flotation being improved by mixed collectors.

show abstract

Section: Results and Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Energy Feature of Air Bubble Detachment from a Low-Rank Coal Surface in the Presence of a Dodecane–Oleic Acid Collector Mixture

Liao

Yang

et al. 2022

ACS Omega

Self Cite

View full text Add to dashboard Cite

show abstract

“…Some scholars focus on the new high-efficiency collectors, mainly focusing on the research of polar collectors and compound collectors. The results show that the polar collector can cover the oxygen-containing sites on the surface of LRC and improve the surface hydrophobicity of LRC, so the clean coal yield of flotation is improved. − In addition, the synergistic effect of polar and nonpolar components in the compound collector further strengthens the flotation.…”

Section: Introductionmentioning

confidence: 97%

New Insight into Temperature Effects on Low-Rank Coal Flotation Using Diesel as a Collector

et al. 2023

View full text Add to dashboard Cite

Efficient flotation of low-rank coal is of great significance for the development of green and low-carbon cycles. Temperature is a crucial parameter of flotation, but the mechanism of its effect on flotation lacks understanding. In this paper, the mechanism was studied by kinetic flotation, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy, low-temperature liquid-nitrogen adsorption (LP-N 2 A), X-ray photoelectron spectroscopy (XPS), and molecular dynamics simulation. The flotation combustible recovery gradually decreases as temperature rises. Compared with 60 °C, the combustible recovery at 5 °C increases by 18.13%. The desorption energy for oil droplets decreases as the temperature rises. As a result, the oil droplets are easier to desorb at high temperatures. The SEM and LP-N 2 A results demonstrate that the pores and fractures of the coal sample are well developed. Also, the oil−water interfacial tension and viscosity of oil droplets decrease as the temperature rises, while the diffusion ability increases. These increase the volume of oil droplets that penetrate into the pores, resulting in poor spreadability of oil droplets on the coal surface. The average volume of bubbles gradually increases as temperature rises, which renders the flotation foam unstable and worsens the flotation. Therefore, the flotation performance is better at low temperatures.

show abstract

“…Xie et al (2018) investigated the adsorption mechanism of fatty acids with different carbon chain lengths on the surface of fluorapatite based on DFT, and the results showed that fatty acids were chemisorbed on the mineral surface. An et al (2021) found that the essence of synergetic mechanism of oleic acid-dodecane was that they formed a relatively ordered "supramolecular structure" on the low rank coal surface. Foucaud et al (2021b) indicated through DFT calculation that during the hydration process of scheelite, Ca 2+ ions on the mineral surface can adsorb water molecules.…”

Section: Introductionmentioning

confidence: 99%

DFT study of coadsorption of fatty acid and kerosene on fluorapatite (001) surface

Du¹,

Li²,

Zhang³

2023

Physicochem. Probl. Miner. Process.

View full text Add to dashboard Cite

The adsorption of fatty acid, kerosene and fatty acid-kerosene on fluorapatite (001) surface were investigated by density functional theory (DFT) calculations. The results showed that the single fatty acid could form stable chemisorption on fluorapatite (001) surface by the O of fatty acids bonding with Ca1 site. The single kerosene could not be stably adsorbed on fluorapatite (001) surface because the H of kerosene did not form hydrogen bond with the O of PO43- on (001) surface (Osurf). For the coadsorption conformation, the chemisorption of fatty acid-kerosene on fluorapatite (001) surface was contributed by the interaction between O of fatty acids and Ca1, the H of kerosene did not bond with the Osurf, but the carbon chain length of kerosene has a large influence on the coadsorption. Compared with the coadsorption of fatty acid-decane, the adsorption of butyric acid-tetradecane and octanoic acid-tetradecane on fluorapatite (001) surface have greater adsorption energies and overlapping region of DOS between O 2p and Ca 4d, indicating that there is a synergistic effect between fatty acid and tetradecane. Meanwhile, the collaborative effects exist between the molecules of fatty acids. The interpenetrating adsorption of fatty acid and kerosene on the fluorapatite surface could improve the adsorption strength and density. The flotation test further confirmed that the single kerosene could not collect fluorapatite, but it could be collected by the single fatty acid. Besides, the synergistic effect between fatty acid and kerosene could increase the flotation recovery of fluorapatite.

show abstract

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

Cited by 12 publications

References 42 publications

Energy Feature of Air Bubble Detachment from a Low-Rank Coal Surface in the Presence of a Dodecane–Oleic Acid Collector Mixture

Energy Feature of Air Bubble Detachment from a Low-Rank Coal Surface in the Presence of a Dodecane–Oleic Acid Collector Mixture

New Insight into Temperature Effects on Low-Rank Coal Flotation Using Diesel as a Collector

DFT study of coadsorption of fatty acid and kerosene on fluorapatite (001) surface

Contact Info

Product

Resources

About