Geochemistry of Late Permian coals from the Moxinpo mine, Chongqing, Southwestern China: Emphasis on petrology, minerals, and organic matter

Lu, Qingfeng; Qin, Shenjun; Wang, Wenfeng; Gao, Kang; Xing, Jingkai

doi:10.1016/j.apgeochem.2023.105558

Cited by 5 publications

(2 citation statements)

References 47 publications

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“…The mineral occurrence characteristics at this point reflect the input of multiple hydrothermal fluids or the precipitation of the same fluid at different stages [49]. Quar , calcite, and dolomite are co-filled in the semifusinite cell cavity, which indicates that quar originates from the authigenic precipitation of Si fluid while calcite and dolomite mainly originate from the precipitation of Ca 2+ -and Mg 2+ -rich pore solutions [50][51][52].…”

Section: Aaems Occurrence Characteristics Of B2-r and B2-imentioning

confidence: 94%

Occurrence of Differences between Alkali and Alkaline Earth Metals (AAEMs), Including Sodium, Potassium, Calcium, and Magnesium, in the Maceral Groups of the Xiheishan Coal, Zhundong Coalfield, Xinjiang, China

Che,

Li,

et al. 2024

Minerals

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This study investigated the differences and correlation between the occurrence characteristics of alkali and alkaline earth metals (AAEMs) among different maceral groups in high-alkali, high-inertinite coal, and provides scientific guidance for the co-separation of AAEMs and inertinite groups in Xinjiang coal. The total AAEMs of inertinite-enriched samples were significantly higher than those in raw coals and vitrinite-enriched samples. Five-step sequential extraction showed that Na mainly occurs as water-soluble sodium (Na-Water) in raw coal and inertinite-enriched samples, accounting for about 53% of the total content, while it exists as organic sodium (Na-NH4Cl and Na-EDTA) in vitrinite-enriched samples, accounting for about 52% of the total content. Ca and Mg are both mainly present in organic form (Ca/Mg-NH4Cl and Ca/Mg-EDTA) in all the samples, with slightly higher proportions present in vitrinite-enriched samples. The contents of K are low in all the samples, which exist in an insoluble state (K-I). Combined microscopy and SEM-EDS analyses have revealed that the localized enrichment of Na in raw coal and inertinite-enriched samples occurs in the inertinite cell cavity, which primarily exists as NaHCO3 combined with quartz crystals, with a maximum content of up to 5.85 wt%. In this study, although EDS spectra could not directly characterize organic Ca and Mg, dolomite and calcite minerals were repeatedly found in the inertinite cell cavity. Moreover, the contents of Ca and Mg in the vitrinite-enriched samples were significantly lower than those in the other samples, which suggests that Ca and Mg are enriched with the inertinite groups. The localized enrichment of AAEMs could not be detected in any of the vitrinite-enriched samples. In summary, though there are significant differences between the occurrence modes of AAEMs in different maceral groups of high-alkali coal, AAEMs have a strong affinity with inertinite, which may be due to the inertinite’s abundant pore structures.

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Section: Aaems Occurrence Characteristics Of B2-r and B2-imentioning

confidence: 94%

Occurrence of Differences between Alkali and Alkaline Earth Metals (AAEMs), Including Sodium, Potassium, Calcium, and Magnesium, in the Maceral Groups of the Xiheishan Coal, Zhundong Coalfield, Xinjiang, China

Che,

Li,

et al. 2024

Minerals

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“…Pyrite in coals has long been the subject of many studies − because of its special characteristics, such as indicating the coal depositional environment, − catalysis in coal liquefaction, and its adverse impacts during coal utilization . Following a previous study, the term coal pyrite used in this paper refers to the pyrite that exists in coal seams, partings, and roofs and floors of coal seams.…”

Section: Introductionmentioning

confidence: 99%

Volatilization of Potentially Harmful Trace Elements in Coal Pyrite during Heat Treatment in a Tube Furnace at 573–1473 K

Wang

Tang

et al. 2023

Energy Fuels

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Some potentially harmful trace elements, such as Sb, As, and Hg, are usually associated with pyrite in coals and can be threats to the environment and human health. In this study, the release of 12 selected elements generally associated with pyrite was investigated during heat treatment in a tube furnace to access their behavior during combustion. FactSage has been used to calculate their behavior with the increase in temperature. Nickel, Cu, Zn, Cr, and Cd are more enriched in the samples containing syngenetic pyrite than in other samples. Other elements are generally more enriched in the samples containing epigenetic pyrite than in other samples. The volatilization of elements with a very high volatility, such as Hg and As, was complete at high temperatures in most samples. For other most elements in this study, the volatilization of a specific element in different samples is generally different. During heat treatment, the selected elements, according to their volatilization, can be classified into three groups: low, medium, or high volatility. At the conditions of this study, the volatilization of trace elements is influenced strongly by their inherent volatility, moderately by their modes of occurrence, and weakly by the pyrite types. The volatility-based behavior of the selected trace elements in FactSage calculation is generally consistent with their classification during heat treatment.

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Evaluate the groundwater quality and human health risks for sustainable drinking and irrigation purposes in mountainous region of Chongqing, Southwest China

Li,

Yan,

et al. 2024

Journal of Contaminant Hydrology

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Geochemistry of Late Permian coals from the Moxinpo mine, Chongqing, Southwestern China: Emphasis on petrology, minerals, and organic matter

Cited by 5 publications

References 47 publications

Occurrence of Differences between Alkali and Alkaline Earth Metals (AAEMs), Including Sodium, Potassium, Calcium, and Magnesium, in the Maceral Groups of the Xiheishan Coal, Zhundong Coalfield, Xinjiang, China

Occurrence of Differences between Alkali and Alkaline Earth Metals (AAEMs), Including Sodium, Potassium, Calcium, and Magnesium, in the Maceral Groups of the Xiheishan Coal, Zhundong Coalfield, Xinjiang, China

Volatilization of Potentially Harmful Trace Elements in Coal Pyrite during Heat Treatment in a Tube Furnace at 573–1473 K

Evaluate the groundwater quality and human health risks for sustainable drinking and irrigation purposes in mountainous region of Chongqing, Southwest China

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