Chemical structure of coals of Vorkuta region and hypercoals by the data of analytic pyrolysis

For the first time, the results of complex mineralogical and geochemical studies of coals of the Mugun lignite deposit of Early-Middle Jurassic age have been obtained. The chemical, phase and microelement composition of coals and coal ash, thermal properties, Raman spectroscopy and isotopic composition of carbon matter have been studied. It has been established that peneplain, characterized by a high degree of laterite-hypergene alteration of rocks, served as a source of terrigenous material for Mugun coals. Many geological, mineralogical, geochemical and technological properties of the studied coals are correlated with the degree of lateritization of the terrigenous admixture.

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Mineralogical and geochemical properties of coals of the Mugun deposit (Irkutsk coal basin)

Dzhumayan

Силаев

Vasiliev

et al. 2022

Vestnik of Geosciences

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Composition of Coals from Republic of Tuva and Their Extracts Based on Pyrolysis and TGA Data

Burdelnaya,

Bushnev,

Ondar

et al. 2024

Solid Fuel Chem.

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Composition of Tuva coals and their extracts according to pyrolysis and TGA data

Burdelnaya,

Bushnev,

Ondar

et al. 2024

Himiâ tverdogo topliva

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Extracts – hypercoals, were obtained from Tuvinian coals of the Ulug-Khem basin by dissolving them in N-methylpyrrolidone. The yield of extracts is 27.3–79.4%, and their ash content is 0.5–0.8%. The composition of the products of pyrolysis, carried out at 420°C, of the initial coals and the extracts obtained from them was studied. It has been shown that rank “Zh” hard coal (coal from the Elegest deposit) can be extracted most effectively. The qualitative and quantitative compositions of pyrolysis products are not fundamentally different in the initial coals and the corresponding extracts. According to TGA data, the decomposition of extracts (hypercoals) occurs at lower temperatures relative to the original coals with a high yield of volatile components.

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Chemical structure of coals of Vorkuta region and hypercoals by the data of analytic pyrolysis

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Mineralogical and geochemical properties of coals of the Mugun deposit (Irkutsk coal basin)

Mineralogical and geochemical properties of coals of the Mugun deposit (Irkutsk coal basin)

Composition of Coals from Republic of Tuva and Their Extracts Based on Pyrolysis and TGA Data

Composition of Tuva coals and their extracts according to pyrolysis and TGA data

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