Modes of occurrence of highly-elevated trace elements in superhigh-organic-sulfur coals

Liu, Jingjing; Zong, Yongqiang; Yan, Xiaoyun; Ji, Dongping; Yongchang, Yang; Hu, Luchang

doi:10.1016/j.fuel.2015.04.034

Cited by 120 publications

(51 citation statements)

References 48 publications

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“…Significant uranium enrichment in coals only occurs in Shanxi, Yunnan, Guizhou, Guangxi, Xinjiang, Inner Mongolia, Sichuan, and Chongqing Provinces of China (Table 1), e.g., the Datong coal (averaging 38.2 mg/kg and 28.8 mg/kg uranium [31]), the Dazhai coal (52.5 mg/kg [32] and 56.0 mg/kg [33]), the Yanshan coal (167 mg/kg [34] and 153 mg/kg [35]), the Luquan coals (34.1 mg/kg [36]), the Guiding coal (229 mg/kg [34] and 200 mg/kg [30]), the Puan coal (32.4 mg/kg [37]), the Zhijin coal (49.6 mg/kg [38]), the Heshan coal (10.2 mg/kg to 326 mg/kg [39][40][41][42]), the Yishan coal (71.7 mg/kg [43]), the Sawabuqi coal (365 mg/kg [44]), the Yili coal (320 mg/kg [45] and 147 mg/kg [46]), the Shenli coal (25.9 mg/kg [47]), the Shiping coal (39.8 mg/kg [48]), and the Moxinpo coal (376 mg/kg [49]). …”

Section: Significant Enrichment Of Uranium In Some Chinese Coalsmentioning

confidence: 99%

“…With respect to the Chinese coals, uranium is associated with: (1) organic matter [30,34,36,39,42,[77][78][79][80][81][82][83], (2) as physical adsorption by pores and pelitic components [46,84], (3) silicates [34,36,37,47,65,66,77,82,[85][86][87][88][89][90][91][92][93], (4) phosphate minerals [94][95][96], (5) uranium minerals [30,34,45], and (6) mixed affinity to both organic and inorganic matter [19,35,97]. Overall, the modes of occurrence of uranium in Chinese coals was deduced indirectly, i.e., correlation with ash yield and major element oxide, and sequential chemical extraction, with only a few from direct evidences of SEM-EDS (Scanning electron microscope combined with an X-ray energy dispersive spectrometer) identification.…”

Section: Modes Of Occurrence Of Uranium In Chinese Coalsmentioning

confidence: 99%

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Abundance, Distribution, and Modes of Occurrence of Uranium in Chinese Coals

Chen

Yao

et al. 2017

Minerals

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Due to its environmental and resource impacts, the geochemistry of uranium in coal is of both academic and practical significance. In order to give a comprehensive summary about the geochemistry of uranium in coals, the abundance, distribution, and modes of occurrence of uranium in Chinese coals were reviewed in this paper. Although some coals from southwestern and northwestern China are significantly enriched in uranium, the common Chinese coals are of a comparable uranium concentration to the world coals. The roof and floor rocks, and parting of coalbeds, or coal benches that are close to the surrounding rock are favorable hosts for uranium in one coalbed. The uranium concentrations in coals of different ages decrease in this order, e.g., Paleogene and Neogene > Late Permian > Late Triassic > Late Carboniferous and Early Permian > Late Jurassic and Early Cretaceous > Early and Middle Jurassic. Uranium in Chinese coals is mainly associated with organic matter, and is correspondingly enriched in subbituminous coal and lignite.

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Section: Significant Enrichment Of Uranium In Some Chinese Coalsmentioning

confidence: 99%

Section: Modes Of Occurrence Of Uranium In Chinese Coalsmentioning

confidence: 99%

Abundance, Distribution, and Modes of Occurrence of Uranium in Chinese Coals

Chen

Yao

et al. 2017

Minerals

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“…The abundance and modes of occurrences of mineral matter are resulted from processes associated with peat accumulation and rank advance, the interaction of the organic matter with basinal fluids, sediment diagenesis, and in some cases, synsedimentary volcanic inputs [3][4][5][6][7]. Thus minerals in coals provide information about the depositional conditions, geologic history of coal-bearing sequences, and regional tectonic evolution [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Mineralogical and Geochemical Characteristics of the Early Permian Upper No. 3 Coal from Southwestern Shandong, China

et al. 2016

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Abstract:The Upper No. 3 coal of the Early Permian age is a major workable seam in the southwestern Shandong coalfield, which is located in the eastern part of North China. From Early Jurassic to Neogene, the coalfield was subjected to intensive tectonic processes, leading to a significant rearrangement in depth of coal seams. In this paper, three Upper No. 3 coals occurring at´228,´670 and´938 m in the Luxi, Liangbaosi, and Tangkou mines, respectively, were collected to investigate their mineralogical and geochemical characteristics, with emphasis on modes of occurrence and origin of epigenetic minerals. The three coal seams are similar in vitrinite reflectance, volatile matter yield, and maceral components, suggesting insignificant influence from the tectonic activities on coal rank. Terrigenous minerals (e.g., kaolinite and quartz) are comparable in both types and distribution patterns in the three coals. The presence of siderite and pyrite of syngenetic or penecontemporaneous origin indicate they were emplaced during peat accumulation. The distribution of epigenetic minerals (e.g., calcite, ankerite, and dolomite) are associated with the underground water activities, which were Ca (Mg, Fe)-bearing.

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“…Rhabdophane, florencite, and silicorhabdophane are the major carriers of light rare earth elements in the samples of the present study. These minerals in coal are generally derived from hydrothermal fluids, and they are also the major REE carriers in some other REE-rich coals as well [31,[54][55][56][57][58][59][60].…”

Section: Hydrothermal Fluid Influencesmentioning

confidence: 99%

Geological Controls on Mineralogy and Geochemistry of an Early Permian Coal from the Songshao Mine, Yunnan Province, Southwestern China

Wang

2016

Minerals

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This paper discusses the content, distribution, modes of occurrence, and enrichment mechanism of mineral matter and trace elements of an Early Permian coal from Songshao (Yunnan Province, China) by means of coal-petrological, mineralogical, and geochemical techniques. The results show that the Songshao coal is characterized by high total and organic sulfur contents (3.61% and 3.87%, respectively). Lithium (170.39 µg/g) and Zr (184.55 µg/g) are significantly enriched in the Songshao coal, and, to a lesser extent, elements such as Hg, La, Ce, Nd, Th, Sr, Nb, Sn, Hf, V, and Cr are also enriched. In addition to Hg and Se that are enriched in the roof and floor strata of the coal seam, Li, La, Ce, Pr, Nd, Sm, Gd, Y, Cd, and Sb are slightly enriched in these host rocks. Compared to the upper continental crust, rare earth elements and yttrium in the host rocks and coal samples are characterized by a light-REE enrichment type and have negative Eu, positive Ce and Gd anomalies. Major minerals in the samples of coal, roof, and floor are boehmite, clay minerals (kaolinite, illite, and mixed layer illite-smectite), pyrite, and anatase. Geochemical and mineralogical anomalies of the Songshao coal are attributed to hydrothermal fluids, seawater, and sediment-source rocks.

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Modes of occurrence of highly-elevated trace elements in superhigh-organic-sulfur coals

Cited by 120 publications

References 48 publications

Abundance, Distribution, and Modes of Occurrence of Uranium in Chinese Coals

Abundance, Distribution, and Modes of Occurrence of Uranium in Chinese Coals

Mineralogical and Geochemical Characteristics of the Early Permian Upper No. 3 Coal from Southwestern Shandong, China

Geological Controls on Mineralogy and Geochemistry of an Early Permian Coal from the Songshao Mine, Yunnan Province, Southwestern China

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