Vitrinite Maceral Separation Using Column Flotation

Kopparthi, Prasad; Singh, Rohit; Nag, Debjani; Mukherjee, Arunabh

doi:10.1080/19392699.2016.1181625

Cited by 18 publications

(5 citation statements)

References 35 publications

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“…15 He et al examined the chemical structure of lignite to anthracite by FTIR spectroscopy and Raman spectroscopy, and divided coal evolution into three stages. 19 For coal macerals, physical methods (the handpicking, 21 flotation, 22 density gradient centrifugation, 23 etc.) were used to separate vitrinite, exinite, and inertinite, and then the chemical structure characteristics of coal macerals were studied.…”

Section: Introductionmentioning

confidence: 99%

Research on Molecular Structure Characteristics of Vitrinite and Inertinite from Bituminous Coal with FTIR, Micro-Raman, and XRD Spectroscopy

Zhou

Pan

et al. 2021

Energy Fuels

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To carry out an in-depth study of the macromolecular differences of vitrinite and inertinite with metamorphism degree, ultimate analysis, Fourier transform infrared (FTIR) spectroscopy, micro-Raman spectroscopy, and X-ray diffraction (XRD) were performed on coal macerals by density gradient centrifugation (DGC). Results show that carbon gradually increases rapidly, hydrogen and oxygen decrease significantly, sulfur gradually decreases, and the change of nitrogen is not obvious with coal rank. Functional groups (ether, carbonyl, hydroxyl, and methylene) gradually fall off with R o,max, and the molecular chains are reconnected to larger macromolecular chains, which eventually increases the maturity and aromaticity of vitrinite and inertinite. The shedding of aliphatic side chains and oxygen functional groups makes the arrangement of coal macromolecules more orderly, the lattice defects of C atom less, and the structure closer to graphitization, which finally show as the decrease of d 002 and the increase of L a and L c. The aromatic structure parameters (f a–F, I, DOC) of vitrinite are lower than those of inertinite, which indicates that the maturity and aromaticity degree of vitrinite are lower than those of inertinite; the aliphatic side chains of vitrinite are larger than those of inertinite, which makes the hydrocarbon generation potential of vitrinite higher than that of inertinite. Vitrinite has more functional groups and complex structure than inertinite, which makes its C atom lattice defects larger and graphitization degree lower than inertinite. Finally, the heterogeneity of macromolecular structure of vitrinite is larger than that of inertinite. This study can provide the basis for macromolecular structure evolution and molecular modeling of coal macerals.

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Section: Introductionmentioning

confidence: 99%

Research on Molecular Structure Characteristics of Vitrinite and Inertinite from Bituminous Coal with FTIR, Micro-Raman, and XRD Spectroscopy

Zhou

Pan

et al. 2021

Energy Fuels

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“…Nonpolar oils and alcohols are the most commonly used flotation agents for coal, and they are also often used for maceral group flotation (Kopparthi et al, 2018). Barnwal et al (2000) performed maceral group flotation using diesel and pine alcohol oil and noted that vitrinite had the highest flotation rate, followed by liptinite, and the slowest flotation rate was observed for inertinite.…”

Section: Surface Property Differences Utilization In Coal Beneficiationmentioning

confidence: 99%

Role of maceral groups in coal beneficiation: A short review

Ping,

Liu,

Xia

et al. 2024

Physicochem. Probl. Miner. Process.

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Macerals are the basic constituents of coal that can be distinguished and identified under the microscope. Depending on the difference in optical properties, the macerals are divided into four maceral groups, including liptinite, vitrinite, huminite and inertinite. These maceral groups not only affect coal mining and utilization but also play different roles in coal beneficiation. According to the different properties of maceral groups, they can be separated (or enriched) to provide high-quality raw materials for the coal industry. This review briefly introduces the international maceral classification system and reviews in detail the role of maceral groups in coal beneficiation combined with their properties.

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“…Flotation is a critical method with prospects for industrial application in the separation and enrichment of coal macerals. Several studies have examined the flotation separation and enrichment of coal macerals via conventional flotation (air flotation), and it was found that vitrinite-rich concentrates can be obtained to a certain extent [11][12][13][14]. Despite much progress being made, techniques for separation and enrichment of coal macerals still face several limitations, such as low separation efficiency, low content of separated macerals, and discontinuous separation processes.…”

Section: Introductionmentioning

confidence: 99%

Oily Bubble Flotation of Coal Macerals of Shendong Jurassic Coal

Qu,

Luo,

Zhu

et al. 2024

Minerals

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The comprehensive quality enhancement and grading of coal are crucial methods for unlocking the high value-added and low-carbon utilization of coal resources. In this work, the influence of oily bubbles on the flotation of Shendong Jurassic vitrinite-rich coal and inertinite-rich coal was studied via flotation tests, Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), contact angle detection, and induction time measurements. FT-IR and XPS analyses demonstrated that the surface of inertinite-rich coal contains more hydrophilic oxygen-containing functional groups. Contact angle and induction time measurements showed that the vitrinite-rich coal is more hydrophobic than inertinite-rich coal, and that for both air and oily bubbles, the induction time on the surface of vitrinite-rich coal is shorter than that on the surface of inertinite-rich coal. In addition, rather remarkably, the induction times for both vitrinite-rich coal and inertinite-rich coal are significantly reduced by oily bubbles. Finally, a better flotation performance for oily bubble flotation of vitrinite-rich coal and inertinite-rich coal was found. It appears that oily bubble flotation is an efficient method for enhancing the recovery of vitrinite-rich coal and inertinite-rich coal.

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Vitrinite Maceral Separation Using Column Flotation

Cited by 18 publications

References 35 publications

Research on Molecular Structure Characteristics of Vitrinite and Inertinite from Bituminous Coal with FTIR, Micro-Raman, and XRD Spectroscopy

Research on Molecular Structure Characteristics of Vitrinite and Inertinite from Bituminous Coal with FTIR, Micro-Raman, and XRD Spectroscopy

Role of maceral groups in coal beneficiation: A short review

Oily Bubble Flotation of Coal Macerals of Shendong Jurassic Coal

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