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Humic Substances from Oxidized and Unoxidized Coal

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Abstract

Oxidized and unoxidized coal samples of various ranks are compared, as well as the humic and fulvic acids derived from those materials. Petrographic analysis shows that macerals of the vitrinite group predominate in the coal samples; the oxidized samples belong to oxidation group OK II. B coal (lignite) and D coal (long-flame coal) undergo more profound changes than G coal (gas coal) on oxidation (weathering). Compared to their unoxidized counterparts, the oxidized coal samples are characterized by higher ash content, yield of volatiles, and content of oxygen, nitrogen, and sulfur. The elemental composition of fulvic and humic acids from oxidized and unoxidized B and D coal varies widely but may be regarded as typical. Compared to fulvic acid, all the samples of humic acid are higher in carbon and lower in oxygen, nitrogen, and sulfur. Given the high yield of fulvic and humic acids from oxidized B and D coal, they may be regarded as promising raw materials for humic production. The yield of fulvic and humic acids from oxidized G coal is minimal.

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ACKNOWLEDGMENTS

This research was conducted on equipment at the Collective Use Center of the Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences.

Funding

Financial support was provided by the Russian Science Foundation (grant 23-77-01067, https://rscf.ru/en/project/23-77-01067/).

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Authors and Affiliations

  1. Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences, Kemerovo, Russia

    K. S. Votolin, S. I. Zherebtsov, K. M. Shpakodraev, A. L. Pykin & D. D. Shaymukhametova

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  1. K. S. Votolin
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  2. S. I. Zherebtsov
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  3. K. M. Shpakodraev
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  4. A. L. Pykin
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  5. D. D. Shaymukhametova
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Correspondence to K. S. Votolin, S. I. Zherebtsov, K. M. Shpakodraev, A. L. Pykin or D. D. Shaymukhametova.

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Translated by B. Gilbert

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Votolin, K.S., Zherebtsov, S.I., Shpakodraev, K.M. et al. Humic Substances from Oxidized and Unoxidized Coal. Coke Chem. 67, 29–36 (2024). https://doi.org/10.3103/S1068364X24600052

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