Charging mechanism analysis of macerals during triboelectrostatic enrichment process: Insights from relative dielectric constant, specific resistivity and X-ray diffraction

He, Xiuli; Sun, Hao; Chen, Xiaowei; Zhao, Bin; Zhang, Xinxi; Komarneni, Sridhar

doi:10.1016/j.fuel.2018.03.189

Cited by 27 publications

(12 citation statements)

References 25 publications

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“…It was observed clearly that vitrinite and inertinite samples with different granularity all share the same change pattern under temperature and RH variations: the RDC of macerals decrease with rising temperature and increase with RH. As concluded in our previous work, water molecules with high polarity have a strong impact on the electrical properties of macerals. The increasing RH would result in an increase in the moisture content of the sample and an increase in RDC, whereas rising temperature has the opposite effect.…”

Section: Results and Discussionsupporting

confidence: 62%

supporting

confidence: 72%

“…Our group has conducted a series of work on triboelectrostatic separation of macerals (vitrinite and inertinite) in low-rank coal used as liquefaction feed, including the relationship between infrared analyses and enrichment effect of macerals, 24 charging mechanism study based on their electrical property differences, 25 and tribocharging behaviors of macerals with typical minerals 26 and various other materials. 27 Previous results showed that vitrinite and inertinite could be separated and enriched at negative and positive plates, respectively, by triboelectrostatic separation based on differences of macerals in various aspects.…”

Section: Introductionmentioning

confidence: 99%

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Enrichment Characteristics of Macerals during Triboelectrostatic Separation in the View of Surface Microstructure, Pore distribution, and Typical Electrical Parameters

Sun

et al. 2021

ACS Omega

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Vitrinite and inertinite, respectively, are the reactive and inert macerals for coal liquefaction, which could be effectively enriched in triboelectrostatic separation specialized in particle processing. Inertinite has a higher specific surface area and more pores than vitrinite and a more balanced mesopores distribution, while the mesopores in vitrinite are mainly focused in the 4 nm × 7 nm range. As for electrical properties, inertinite has a higher relative dielectric constant than vitrinite in all granularities, while its resistivity is only higher than vitrinite in the <74 μm fraction, which means inertinite and vitrinite tend to have negative and positive charges, respectively, in their mutual friction, but inertinite (<74 μm) has a stronger ability to maintain surface charge. During triboelectrostatic separation, the 105 μm × 150 μm fraction of clean coal has the highest vitrinite content, whereas inertinite tends to concentrate at tailings <74 μm under the co-effect of separation granularity limit and electrical characteristics of macerals; this conclusion has a certain guiding significance to maceral separation.

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Section: Results and Discussionsupporting

confidence: 62%

supporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

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Enrichment Characteristics of Macerals during Triboelectrostatic Separation in the View of Surface Microstructure, Pore distribution, and Typical Electrical Parameters

Sun

et al. 2021

ACS Omega

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“…Sieving exploits the size distribution characteristics of unburned carbon to achieve removal, as demonstrated by the measurable reduction of unburned carbon only in fine particles [ 16 ]. The research on electrostatic separation is relatively mature [ 17 , 18 , 19 , 20 ]. Triboelectrostatic separation of fly ash is usually accomplished by triboelectrification of the fly ash followed by passing it between two oppositely charged electrodes [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Curing Temperature on CH-Based Fly Ash Composites

Takasu

Suyama

et al. 2023

Materials

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Curing temperature affects the compressive strength of cement paste systems via the pozzolanic reaction. However, different processes, climates, and weather conditions often result in different initial curing temperatures. The relationship between curing temperature and compressive strength is still an underexplored domain. To explore the effect of curing temperature on calcium hydroxide (CH)-based fly ash composites, fly ashes from different carbon sources were used to make CH-based composites, and the compressive strength, reaction rate, CH content, and C-S-H generation were analyzed. The correlation between the reaction rate and C-S-H content was analyzed. High-temperature curing improved the compressive strength of the cement paste system by affecting the CH-based reaction rate in the initial stage, with the highest initial reaction rate reaching 28.29%. However, after cooling to constant temperature, high-temperature curing leads to a decrease in CH and C-S-H content. The average decrease rate of calcium hydroxide content under high temperature curing is 38%, which is about 2.38 times that of room-temperature curing conditions. This led to a decrease in the compressive strength of the cement paste. Therefore, the performance of CH-based fly ash composites produced by low-temperature curing was superior to that of composites produced by high-temperature curing.

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“…The current commercial anode materials are mainly special carbons, which have the advantages of high chemical stability, strong electrical conductivity, inexpensiveness, and easiness to obtain [4,5]. Various carbon anode materials with different microstructures and functions have attracted wide attention, such as graphite [6], hard carbon [7,8], soft carbon [9][10][11], heteroatom doped carbon [12][13][14], and so on. Metal-organic framework (MOF) derived carbon-based materials have raised much attention as anodes for Na + and Li + storage [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Fe, Ni-modified ZIF-8 as a tensive precursor to derive N-doped carbon as Na and Li-ion batteries anodes

Jia¹,

Wang²,

Zhao³

et al. 2022

Nanotechnology

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Carbon materials derived from metal-organic frameworks (MOFs) have attracted increasing attention as anodes for energy storage. In this study, Fe, Ni-doped ZIF-8 is carbonized at high temperature to obtain bimetallic Fe and Ni modified tension -relaxed carbon (FeNi@trC). Fe and Ni have opposite structural modification effects when the metal ions are doped into the ZIF-8 dodecahedron. The obtained carbon material maintains the regular dodecahedron morphology, which means the relaxation of tension and strong thermal stability during annealing. Moreover, the presence of nickel enhances the carbonization degree and electrochemical stability of FeNi@trC, while the calcination of the tensive ZIF-8 precursor offers more defect sites. The discharge capacities of FeNi@trC materials are stable at 182.9 mAh·g-1 and 567.9 mAh·g-1 for SIB and LIB at 0.05 A·g-1. Compared with the current density of 0.05 A·g-1, the discharge capacity of SIB and LIB attenuates by 29.4% and 55.9% at 1 A·g-1, respectively, and the FeNi@trC shows good performance stability in the following cycles.

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Charging mechanism analysis of macerals during triboelectrostatic enrichment process: Insights from relative dielectric constant, specific resistivity and X-ray diffraction

Cited by 27 publications

References 25 publications

Enrichment Characteristics of Macerals during Triboelectrostatic Separation in the View of Surface Microstructure, Pore distribution, and Typical Electrical Parameters

Enrichment Characteristics of Macerals during Triboelectrostatic Separation in the View of Surface Microstructure, Pore distribution, and Typical Electrical Parameters

The Effects of Curing Temperature on CH-Based Fly Ash Composites

Fe, Ni-modified ZIF-8 as a tensive precursor to derive N-doped carbon as Na and Li-ion batteries anodes

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