Anomalies of rare metals in Lopingian super-high-organic-sulfur coals from the Yishan Coalfield, Guangxi, China

Dai, Shifeng; Xie, Panpan; Ward, Colin R.; Yan, Xiaoyun; Guo, Wenmu; French, David; Graham, Ian T.

doi:10.1016/j.oregeorev.2017.05.007

Cited by 117 publications

(52 citation statements)

References 79 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%

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%

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

Chen

Yao

et al. 2017

Minerals

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“…In addition, Spain Mequinenza lignite [4], New Zealand Charming Creek coal [5], India Tipong coal [6], and some coals from the Australia Gippsland Basin [7] are all SHOS coals. The SHOS coals in China are mainly part of the Late Permian coals in South China and primarily distributed in Guiding in Guizhou Province [8,9], Heshan in Guangxi Province [10,11], Chenxi in Hunan Province [12], Yanshan in Yunnan Province [13], Anxian in Sichuan Province [14], and Yishan in Guangxi Province [15]. Currently, it is controversial that the abundant "organic sulfur" in the SHOS coals is fully organically bound [16].…”

Section: Introductionmentioning

confidence: 99%

13C-NMR Study on Structure Evolution Characteristics of High-Organic-Sulfur Coals from Typical Chinese Areas

Wei

Tang

2018

Minerals

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Abstract:The structure evolution characteristics of high-organic-sulfur (HOS) coals with a wide range of ranks from typical Chinese areas were investigated using 13 C-CP/MAS NMR. The results indicate that the structure parameters that are relevant to coal rank include CH 3 carbon (f al *), quaternary carbon, CH/CH 2 carbon + quaternary carbon (f al H ), aliphatic carbon (f al C ), protonated aromatic carbon (f a H ), protonated aromatic carbon + aromatic bridgehead carbon (f a H+B ), aromaticity (f a CP ), and aromatic carbon (f ar C ). The coal structure changed dramatically in the first two coalification jumps, especially the first one. A large number of aromatic structures condensed, and aliphatic structures rapidly developed at the initial stage of bituminous coal accompanied by remarkable decarboxylation. Compared to ordinary coals, the structure evolution characteristics of HOS coals manifest in three ways: First, the aromatic CH 3 carbon, alkylated aromatic carbon (f a S ), aromatic bridgehead carbon (f a B ), and phenolic ether (f a P ) are barely relevant to rank, and abundant organic sulfur has an impact on the normal evolution process of coal. Second, the average aromatic cluster sizes of some super-high-organic-sulfur (SHOS) coals are not large, and the extensive development of cross bonds and/or bridged bonds form closer connections among the aromatic fringes. Moreover, sulfur-containing functional groups are probably significant components in these linkages. Third, a considerable portion of "oxygen-containing functional groups" in SHOS coals determined by 13 C-NMR are actually sulfur-containing groups, which results in the anomaly that the oxygen-containing structures increase with coal rank.

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“…Meanwhile, in Shengli coal of Inner Mongolia, elemental F was found in illite and the illite smectite mixed layer (IS), which was verified by the strong positive correlations between F and ash yield, SiO 2 , Al 2 O 3 , and K 2 O (r > 0.95) [62]. The F in Daqingshan coal is slightly enriched (2 < CC < 5), has similar concentrations as Ga, V, Cu, Se, and Mo, and has positive correlations with ash, SiO 2 , and Al 2 O 3 (r = 0.93) [42], the primary minerals in coal are quartz and kaolinite [33,34,46], elemental F found in kaolinite and elemental F in Wulantuga coal was also adsorbed on clay minerals and was verified by statistical analysis (with positive correlations between F and ash, Al 2 O 3 , SiO 2 , and K 2 O) [44]. The same occurred in Guanbanwusu [45] and Haerwusu coal [46], where fluorine was found in kaolinite and boehmite.…”

Section: Modes Of Fluorine Occurrence In Coalmentioning

confidence: 99%

Fluorine in Chinese Coal: A Review of Distribution, Abundance, Modes of Occurrence, Genetic Factors and Environmental Effects

et al. 2017

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Fluorine, a hazard that is associated with coal, has resulted in serious environmental issues during the production and utilization of coal. In this paper, we provide a detailed review of fluorine in Chinese coal, including the distribution, concentration, modes of occurrence, genetic factors, and environmental effects. The average concentration of fluorine in Chinese coal is 130.0 mg/kg, which is slightly higher than coal worldwide (88.0 mg/kg). The enrichment of fluorine in Chinese coal varies across different coal deposit regions, and it is especially high in Inner Mongolia (Junger coalfield, Daqingshan coalfield) and southwest China (coal mining regions in Yunnan, Guizhou province). The fluorine distribution is uneven, with a relatively high content in southwest coal (including Yunnan, Guizhou, Chongqing, and Sichuan provinces), very high content in the coal of North China (Inner Mongolia) and South China (Guangxi), and is occasionally found in the northwest (Qinghai). Fluorine occurs in various forms in coal, such as independent minerals (fluorine exists as fluorapatite or fluorite in coal from Muli of Qinghai, Taoshuping of Yunnan, Guiding of Guizhou, and Daqingshan of Inner Mongolia), adsorption on minerals (fluorine in coal from Nantong, Songzao of Chongqing, Guxu of Sichuan, and Shengli, Daqingshan, and Junger from Inner Mongolia), substitution in minerals (Wuda coal, Inner Mongolia), and a water-soluble form (Haerwusu coal, Inner Mongolia). The enrichment of fluorine is mainly attributed to the weathering of source rock and hydrothermal fluids; in addition to that, volcanic ash, marine water influence, and groundwater affect the fluorine enrichment in some cases. Some environmental and human health problems are related to fluorine in coal, such as damage to the surrounding environment and husbandry (poisoning of livestock) during the coal combustion process, and many people have suffered from fluorosis due to the burning of coal (endemic fluorosis in southwest China).

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Anomalies of rare metals in Lopingian super-high-organic-sulfur coals from the Yishan Coalfield, Guangxi, China

Cited by 117 publications

References 79 publications

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

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

13C-NMR Study on Structure Evolution Characteristics of High-Organic-Sulfur Coals from Typical Chinese Areas

Fluorine in Chinese Coal: A Review of Distribution, Abundance, Modes of Occurrence, Genetic Factors and Environmental Effects

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