Chemical and physical modification of low rank coal floatability by a compound collector

Xia, Wencheng; Wu, Feng; Jaiswal, Soni; Li, Yijiang; Peng, Yaoli; Xie, Guangyuan

doi:10.1016/j.colsurfa.2020.125943

Cited by 27 publications

(3 citation statements)

References 42 publications

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“…At present, the research on the mixed collector of low-rank coal slime has been reported. Xia et al 10 used coal tar and diesel as a mixed collector to carry out low-rank coal flotation, and the cleaned coal yield increased from 38.6 to 87.4%, effectively improving the flotation effect. Liao et al 11 investigated the flotation performance of dodecane, ethyl ester, and dodecane–ethyl ester on low-rank coal, and the results showed that the flotation performance of the mixed collector was significantly better than that of a single collector.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Flotation Separation of Low-Rank Coal with a Mixed Collector: Experimental and Molecular Dynamics Simulation Study

Kang

Zhang

2022

ACS Omega

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The efficient flotation separation of low-rank coal is still a difficult problem. The development of a collector is the key to solve the problem. In this study, a kind of mixed collector scheme with a practical value is proposed. The effects of the single collector dodecane (D) and methyl oleate (MO) and mixed collector D–didodecyl dimethyl ammonium bromide (DDAB) and MO–DDAB on flotation separation of low-rank coal were investigated. The flotation test results show that when the molar ratios of the mixed collector D–DDAB and MO–DDAB are 9:1 and the flotation time is 4 min, the cumulative combustible recovery of low-rank coal flotation is 71.49 and 76.73%, respectively, and the cleaned coal ash is 15.26 and 13.03%, respectively. The mixed collector significantly improves the flotation effect of low-rank coal compared with the single collector. According to the analysis results of the contact angle, wetting heat, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy, the hydrophobicity of the low-rank coal surface is enhanced under the action of the mixed collector, and the adsorption between the mixed collector and coal surface is stronger. In addition, molecular dynamics (MD) simulation results show that compared with D or MO, DDAB tends to adsorb on the surface of low-rank coal, and the diffusion coefficients of water molecules on the surface of coal increase. The mixed collector first repels water molecules through its double hydrophobic carbon chain to weaken the binding of the coal surface to water molecules and then uses D or MO to further repel water molecules, thus effectively enhancing the surface hydrophobicity of low-rank coal.

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Section: Introductionmentioning

confidence: 99%

Enhanced Flotation Separation of Low-Rank Coal with a Mixed Collector: Experimental and Molecular Dynamics Simulation Study

Kang

Zhang

2022

ACS Omega

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“…Coal surface hydrophobicity is an important surface property that determines the flotation effect of coal slimes. In other words, the higher the hydrophobicity of the coal surface, the better the flotation effect (Xia et al, 2021;Li et al, 2020c).…”

Section: Introductionmentioning

confidence: 99%

“…Xu et al found that the oxygen content on the surface of long-flame coal was higher than the carbon content, and the combustible recovery was only 30.14% when diesel was used at 6 kg/t (Xu et al, 2018); increasing the amount of diesel used in the flotation process helps to improve the flotation of high oxygen content coals. Xia et al found that dodecane only interacts with nonpolar groups on the surface of low-rank coals through hydrophobic interactions and hardly interacts with polar groups on their surfaces through molecular dynamics simulations (Xia et al, 2021;Liu et al, 2019;Xia et al, 2020a;Xia et al, 2019a;Zhang et al, 2020b;. These indicate that OCFG on coal surfaces can limit the adsorption of hydrocarbon oils, affecting the flotation efficiency of low-rank coals (LRC) and oxidized coal (Xia et al, 2019a;Zhang et al, 2020c;Zhang et al, 2021a;Abarca et al, 2018;Carla et al, 2018;Zhou et al, 2018;Jia et al, 2000;Dey et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Effect of the oxygen-containing functional group on the adsorption of hydrocarbon oily collectors on coal surfaces

He¹,

Hu²,

Luukkanen³

et al. 2022

Physicochem. Probl. Miner. Process.

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The oxygen-containing functional groups (OCFG) on the coal surface affect the adsorption effect of hydrocarbon oily collectors (HOC). An investigation of the interaction between the HOC and OCFG in the absence and presence of water is conducive to understanding the effect of OCFG type on the adsorption of HOC on the coal surface. In this paper, FTIR analysis was used to analyze the OCFG type of coal surface. The adsorption behavior of HOC on different OCFG surfaces was investigated using molecular dynamics simulation. The results indicated the presence of OCFG such as -OH, -COOH, -C=O, and -COCH3 on the coal surface. In conditions without water, the effect of OCFG on HOC adsorption capability follows the order -COOH > -C=O > -OH > -COCH3. In an aqueous solution, the effect of OCFG on HOC adsorption capability follows the order -C=O>-COCH3>-OH>-COOH. Moreover, the hydrophilicity of OCFG is the key factor that affects the adsorption effect of HOC. In other words, the adsorption effect of HOC on the coal surface in an aqueous solution does not depend on the strength of the interaction between the OCFG and HOC in the absence of water, but on the hydrophilicity of the OCFG. The -COOH and -OH on the coal surface are not conducive to the adsorption of HOC onto the coal surface. Masking the -COOH and -OH of the coal surface is beneficial in improving the coal flotation performance with HOC as a collector.

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Flocculation of sodium alginate combined with AlCl3/PAC on fine calcite: An in-situ experimental and calculation study

Li,

Chen,

Xia

et al. 2025

Applied Surface Science

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Chemical and physical modification of low rank coal floatability by a compound collector

Cited by 27 publications

References 42 publications

Enhanced Flotation Separation of Low-Rank Coal with a Mixed Collector: Experimental and Molecular Dynamics Simulation Study

Enhanced Flotation Separation of Low-Rank Coal with a Mixed Collector: Experimental and Molecular Dynamics Simulation Study

Effect of the oxygen-containing functional group on the adsorption of hydrocarbon oily collectors on coal surfaces

Flocculation of sodium alginate combined with AlCl3/PAC on fine calcite: An in-situ experimental and calculation study

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