Composition and quality of coals in the Huaibei Coalfield, Anhui, China

Zheng, Lu; Liu, Guijian; Lei, Wang; Chou, Chen‐Lin

doi:10.1016/j.gexplo.2007.11.002

Cited by 41 publications

(12 citation statements)

References 24 publications

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“…A coal forming environment of lesser detrital input and stronger marine water influence may be responsible for lower ash yields for coals of the Shanxi Formation, while the intensively fluvial influence of the Shihezi Formation is associated with higher ash yields. Zheng et al (2008c) sug- gested that there is also an increasing trend of terrigenous clastic input from the Shanxi Formation to the Upper Shihezi Formation in the Huaibei Coalfield which is an adjacent and geologically similar coalfield, and the variation trend of the ash yield, namely, with the increasing trend stratigraphically upward, is similar to that of the Huaibei Coalfield. But the Permian coals in the Huainan Coalfield are higher in ash yield than the coals of the Huaibei Coalfield reported by Zheng et al (2008c).…”

Section: Ash Yields Sulfur Contents and Mineralsmentioning

confidence: 91%

“…Zheng et al (2008c) sug- gested that there is also an increasing trend of terrigenous clastic input from the Shanxi Formation to the Upper Shihezi Formation in the Huaibei Coalfield which is an adjacent and geologically similar coalfield, and the variation trend of the ash yield, namely, with the increasing trend stratigraphically upward, is similar to that of the Huaibei Coalfield. But the Permian coals in the Huainan Coalfield are higher in ash yield than the coals of the Huaibei Coalfield reported by Zheng et al (2008c). Additionally, the Permian coals in the Huainan Coalfield are …”

Section: Ash Yields Sulfur Contents and Mineralsmentioning

confidence: 91%

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Geochemistry of trace elements in coals from the Huainan Coalfield, Anhui, China

et al. 2014

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With the aim of better understanding geochemistry of coal, 416 borehole samples of coal, one parting, two floor and two roof mudstones were collected from 9 minable coal seams in 24 boreholes drilled during exploration in the Huainan Coalfield, Anhui, China, and 47 elements were determined by various analytical techniques. The depositional environment, abundance, distribution, and affinity of elements were investigated. Results shown that the boron concentration in the coals indicates a brackish water depositional environment in this study region and marine influence decreased from coal seam 1 to 13-1. Some potentially toxic elements (e.g., Se, Cd) are higher than their averages for Chinese coals. The roof, floor and parting samples have higher contents of some elements than do the coal seams. The minerals in the coals from the Huainan Coalfield were found to consist mainly of clays, carbonates and sulfides. The elements can be classified into two groups based on their stratigraphic distribution from coal seam 1 to 13-1, and the characteristics of each group are discussed in detail. The elements may be classified into four groups (i.e., Group 1 to 4) according to their correlation coefficients with ash yield. The elements in Group 1, Group 2, and Group 3 are strongly correlated with ash yield, while the elements in Group 4 have weak or negative correlation coefficients.

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Section: Ash Yields Sulfur Contents and Mineralsmentioning

confidence: 91%

Section: Ash Yields Sulfur Contents and Mineralsmentioning

confidence: 91%

Geochemistry of trace elements in coals from the Huainan Coalfield, Anhui, China

et al. 2014

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“…These include those by Bai et al (2008), Cheng et al (2001), Dai et al (2005a;, Huang et al (2004a), Li et al (2003;, Li and Zhao (2007), Liu et al (2004a;, Song et al (2007), Wang et al (2004b;, Yang (2006b), Yi et al (2008a), Yiwei et al (2007), Yue and Zhao (2008), Zhao et al (2008b), Zheng et al (2008a), and Zhuang et al (2007). These and other measurements have shown that (a) the average lead concentration in some Chinese coal (e.g., 185 μg/g) is substantially higher (∼20-fold) than the average concentration (11 μg/g) for U.S. coal (Yang, 2006), and (b) lead concentrations in some Chinese coal combustion emissions exceed the country's emissions standards , because China has not implemented emission controls to limit atmospheric releases of lead and other pollutants on all of its fossil fuel plants that are required for such plants in most industrialized countries (Xu et al, 2004;Yi et al, 2008a).…”

Section: Overviewmentioning

confidence: 99%

All the Lead in China

Flegal

Gallon

Ganguli

et al. 2013

Critical Reviews in Environmental Science and Technology

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Lead contamination in China has been extensively documented by scientists in China and elsewhere over the past two decades, as summarized in this review of articles published in peer-reviewed scientific journals. Sources of that contamination include (a) deposits from previous emissions of leaded gasoline, which was finally eliminated in the past decade; (b) previous and continuing emissions from fossil fuel combustion, which are increasing markedly with the rapid industrialization of China; (c) previous and continuing emissions from other industrial activities, including mining, smelting and municipal waste incineration; and (d) previous and continuing additions of contaminated fertilizers, sewage, and untreated wastewater to agricultural fields. Lead concentrations of some Chinese agricultural produce are also elevated by acid rain and acidic fertilizers, which increase the solubility and bioavailability of both natural and contaminant lead in soil. In addition, some Chinese products are contaminated with lead during their production, processing, packaging, and transport. As a consequence of the long-range transport of industrial lead emissions from China and the global market for its products, the problem of lead pollution in China is a global problem.

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“…Concentration coefficients (CCs) (which refer to ratios of concentrations of trace elements in fault-related coals to regional value) of trace elements in coal are useful parameters for estimating relative enrichment of those elements. Regional concentrations of trace elements provided by Zheng et al [79,80] are used as a reference. According to the categorization scheme proposed by Dai et al [74,81,82], CCs of fault-related coals were classified into four categories: enriched (5 < CC < 10), slightly enriched (2 < CC < 5), normal (0.5 < CC <2), and depleted (CC < 0.5).…”

Section: Distribution Of Oxides Of Major Elementsmentioning

confidence: 99%

Geochemical Alteration and Mineralogy of Coals under the Influence of Fault Motion: A Case Study of Qi’nan Colliery, China

Liu

Jiang

2019

Minerals

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Geochemical characteristics of rocks in fault zones have been extensively studied, while there are limited studies on coal occurring in fault zones of underground coal mine. In this study, five coal samples were carefully collected from a reverse fault zone in Qi’nan colliery. Systematical detection methods were employed to analyze the different chemical and physical characteristics of fault-related coal samples. Through comparative analysis, the following insights are obtained. Three subdivided fault zones were classified according to the deformation characteristics of coal samples. Frictional heat and strong ductile deformation generated by fault motion led to the dissociation of phenol and carboxyl groups in coal molecules, which sharply decreased the concentrations of elements Co and Mo bound to these functional groups in zone I. The modified pore-cleat system in zone I with higher pore volume and lower permeability allowed solutions containing enriched trace elements to migrate through zone I locally. Concentrations of HREE, MREE and related elements associated with the invasive solutions showed significant positive anomalies in zone I. Precipitation and smearing of clay minerals in zone I led to poorer connectivity. Disruption and delamination of laminar clay minerals by strong compression-shear stress significantly increased the adsorption sites for related elements, especially the HREE and MREE. Nano-scale clay minerals resulting from stress-induced scaly exfoliation also enhanced the retention capability of REE in zone I.

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Composition and quality of coals in the Huaibei Coalfield, Anhui, China

Cited by 41 publications

References 24 publications

Geochemistry of trace elements in coals from the Huainan Coalfield, Anhui, China

Geochemistry of trace elements in coals from the Huainan Coalfield, Anhui, China

All the Lead in China

Geochemical Alteration and Mineralogy of Coals under the Influence of Fault Motion: A Case Study of Qi’nan Colliery, China

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