Thermodynamic behavior and flotation kinetics of an ionic liquid microemulsion collector for coal flotation

Zhu, Xianchang; Wei, Hengbin; Hou, Mingyu; Wang, Qingbiao; You, Xiaofang; Li, Lin

doi:10.1016/j.fuel.2019.116627

Cited by 40 publications

(7 citation statements)

References 37 publications

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“…Flotation kinetics is based on uniformity of chemical kinetics to investigate the law of flotation rate, reflecting the speed of the flotation process (Zhu et al, 2020). In the present article, six flotation kinetic models are selected to investigate the influence of different particle sizes on the flotation behavior of coal slime.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, the flotation time recovery curve is widely used to describe the flotation kinetics, and it can also be completely described by a mathematical model (Zhang et al, 2013). Flotation kinetics is a dynamic system that describes the cumulative combustible recovery of the flotation process as a function of the flotation time to reflect the flotation rate (Zhu et al, 2020). The final recovery normalr ∞ and the flotation rate constant (k) are considered to be the two main parameters that can be obtained from the flotation model to describe the performance of the flotation process (Çilek, 2004; Jameson, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Effects of particle size on the flotation behavior of coal slime

Deng

Tang

et al. 2023

Energy Exploration & Exploitation

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In order to investigate the influence of particle size on the flotation behavior of coal slime, industrial analysis, elementary analysis, and particle size composition analysis were carried out on coal slime. The coal slime is divided into three sizes: −0.5 + 0.25, −0.25 + 0.074, and −0.074 mm, and full −0.5 mm particle sizes. Through contact angle measurement, wetting heat measurement, and step-by-step release test to investigate the hydrophobicity of each particle size; in addition, the flotation kinetics test of different particle sizes coal slime was also carried out. The results show that the particle size has a significant effect on the flotation behavior of fine coal slime. The medium particle size −0.25 + 0.074 mm has the best hydrophobicity, followed by −0.5 + 0.25 mm, again −0.5 mm, and finally −0.074 mm particle sizes. Use Origin software to fit six kinetic models to the test data of coal slime flotation kinetics, and analyze the maximum combustible recovery [Formula: see text], flotation rate constant (k), and correlation coefficient ([Formula: see text]) of each particle size, The results show that the first-order model with rectangular distribution of floatabilities can better describe the flotation of coal slime of each particle size.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of particle size on the flotation behavior of coal slime

Deng

Tang

et al. 2023

Energy Exploration & Exploitation

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“…21 ILs with long alkyl chains exhibit good surface activity and can be used as surfactants for the preparation of microemulsions. Zhu et al 22 chose a [C 16 mimCl]/ndodecane/n-pentanol/water microemulsion system to separate coal slime from coal, which signicantly decreased the treatment cost. Martínez-Mora et al 23 found that the length of the alkyl chain and charge density of anion ions inuenced the p-p interaction between asphaltenes, i.e., cations with longer alkyl chains could disperse asphaltenes better.…”

Section: Introductionmentioning

confidence: 99%

Insight into the oil removal mechanism of quaternary ammonium ionic liquid microemulsions for oily sludge treatment

Chang

et al. 2023

Sustainable Energy Fuels

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“…Moreover, China's proven reserves of low-rank coal exceed 200 billion tons and account for approximately 20% of the proven Chinese coal reserves (Li et al, 2013). Thus, global lowrank coal resources are abundant, but the surface hydrophobicity of this type of coal is poor because of the hydrophilicity of the oxygen-containing functional groups on the coal surface, which complicates the use of this coal (Gutierrez-Rodriguez and Aplan, 1984;Lyu et al, 2018;Zhu et al, 2019). When the oxygen content of the coal surface reaches a certain threshold, it becomes the primary factor determining the surface hydrophobicity.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, it is important to explore the effects of ILs as surfactants on coal wetting characteristics. Various reports (Liu et al, 2013;Shi et al, 2002;Zhu, et al, 2019, Zhu et al, 2020 have shown that the structures of ILs can be easily modified, and their physicochemical properties can thus be adjusted as desired. Consequently, they can be used to produce surfactants with the desired degree of hydrophobicity, hydrophilicity, or amphiphilicity, and they represent a potential avenue for changing coal wettability and preventing coal dust generation.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a magnetic ionic liquid ([C12mim]FeCl4) and its interactions with low-rank coal

Li¹,

Liu²,

Lin³

et al. 2020

Physicochem. Probl. Miner. Process.

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The large number of oxygen-containing functional groups present on the surface of low-grade coal contribute to its strong hydrophilic properties and rendering coal beneficiation by flotation challenging. In this study, a magnetic ionic liquid (IL), [C12mim]FeCl4, was developed as a green medium to treat low-rank coal. Notably, the IL can be recovered using a magnetic field. The interactions between the low-rank coal and the IL were analyzed, and the structure and properties of [C12mim]FeCl4 were characterized using Raman spectroscopy, Fourier-transform infrared (FT-IR) spectroscopy, and vibrating-sample magnetometry. Moreover, the effects of the newly prepared IL on the wetting properties of low-rank coal were studied using water contact angle measurements. The contact angle of the coal sample treated with the IL increased initially but decreased with subsequent increase in treatment time, indicating a change in coal wettability with time. The results from FT-IR analysis show that the changes in contact angles may be attributed to the changes to the oxygen-containing functional groups at the coal surface upon interaction with the IL, where the content of oxygen-containing functional groups in the treated coal sample initially decreased but subsequently increased with increase in treatment time. X-ray photoelectron spectroscopy analysis confirmed these results. Thus, it can be concluded that [C12mim]FeCl4 initially destroys the oxygen-containing functional groups at the coal surface, resulting in an increase in the water-coal contact angle but subsequently promoting oxidation of the coal surface, hence causing a reduction in the contact angle.

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Thermodynamic behavior and flotation kinetics of an ionic liquid microemulsion collector for coal flotation

Cited by 40 publications

References 37 publications

Effects of particle size on the flotation behavior of coal slime

Effects of particle size on the flotation behavior of coal slime

Insight into the oil removal mechanism of quaternary ammonium ionic liquid microemulsions for oily sludge treatment

Synthesis of a magnetic ionic liquid ([C12mim]FeCl4) and its interactions with low-rank coal

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