Stone coal in China: a review

Dai, Shifeng; Zheng, Xuan; Wang, Xibo; Finkelman, Robert B.; Jiang, Yaofa; Ren, Dongdong; Yan, Xiaoyun; Zhong, Yiping

doi:10.1080/00206814.2017.1378131

Cited by 89 publications

(40 citation statements)

References 59 publications

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“…The typical value of radon concentrations of stone-coal mines in China was, therefore, suggested to be 1500 Bq/m 3 , which is three times the lower limit of the action level (500 Bq/m 3 ). Stone coal is a type of anthracite with low carbon content, high ash content, low heat value, and which contains large amounts of pyrite, quartz, and phosphorus nodules [12]. The high uranium content of the mineral nodules and lack of effective ventilation are the major reasons that radon exceeds the limit in laneways of stone-coal mines.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamic Simulation of Inhaled Radon Dilution by Auxiliary Ventilation in a Stone-Coal Mine Laneway and Dosage Assessment of Miners

Zhou

Chang

2019

Processes

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Inhaled radon status in the laneways of some Chinese stone-coal mines is a cause of concern. In this study, computational fluid dynamics simulations were employed to investigate three flowrates of the dilution gas (2.5, 5, and 7.5 m 3 /s) and radon distributions at realistic breathing levels (1.6, 1.75, and 1.9 m). The results showed that there are obvious jet-flow, backflow, and vortex zones near the heading face, and a circulation flow at the rear of the laneway. A high radon concentration area was found to be caused by the mining machinery. As the ventilation rate increased, the radon concentrations dropped significantly. An airflow of 7.5 m 3 /s showed the best dilution performance: The maximum radon concentration decreased to 541.62 Bq/m 3 , which is within the safe range recommended by the International Commission on Radiological Protection. Annual effective doses for the three air flowrates were 8.61, 5.50, and 4.12 mSv.

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Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamic Simulation of Inhaled Radon Dilution by Auxiliary Ventilation in a Stone-Coal Mine Laneway and Dosage Assessment of Miners

Zhou

Chang

2019

Processes

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“…High-U coals have again attracted much attention for industrial utilization [9,17,18]. In addition to coal as the hosted uranium deposit, the host rocks of the coal seams (such as floor [19]) and stone coals [20] also contain high concentrations of uranium and thus have both potential industrial significance and adverse environmental effects.…”

Section: Introductionmentioning

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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“…The data of the Songzao Coalfield is from Seredin and Dai [58]. The data of the Guxu Coalfield is from Dai et al [82].…”

Section: Discussionmentioning

confidence: 99%

“…Dai et al used the Eu anomalies to identify that the Yishan coals have been influenced by high-temperature hydrothermal solutions [10]. However, not all the coals influenced by hydrothermal solutions should have positive Eu anomalies [82]. For example, in some cases, coals or stone coals affected by hydrothermal solutions have a weak negative anomaly because the felsic sediment input overlapped the hydrothermal solutions [82].…”

Section: Sediment Source Regionmentioning

confidence: 99%

Mineralogical and Geochemical Compositions of the Lopingian Coals in the Zhongliangshan Coalfield, Southwestern China

et al. 2018

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Abstract:The mineralogical and geochemical compositions of the Lopingian coals from an exploratory drill core (ZK4-1) in the Zhongliangshan Coalfield, southwestern China are reported in this paper. The Zhongliangshan coals are medium volatile bituminous in rank (random vitrinite reflectance, average 1.38%), characterized by a medium-ash yield (26.84%) and high sulfur content (3.38%). Minerals in the Zhongliangshan coals are mainly composed of clay assemblages (kaolinite, the illite/smectite mixed layer (I/S) and chamosite), pyrite, quartz, carbonate minerals (calcite, marcasite, ankerite, and dolomite), and anatase, followed by rutile, jarosite, natrojarosite, bassanite, gypsum and K-feldspar, with traces of apatite, rhabdophane and barite. Compared with the average concentrations of the world hard coals, some trace elements including Li, V, Co, Cu, Se, Y, Zr, Nb, rare earth elements (REE), Cd, Ta, Hf and Hg, are enriched in the Zhongliangshan coals. The modes of occurrence of chamosite, barite, rhabdophane, quartz and calcite in the Zhongliangshan coals indicate that the coals have probably been affected by the injection of low-temperature hydrothermal fluids. Based on the concentrations of Sc, V, Cr, Co, Ni, Cu and Zn, the ratios of Al 2 O 3 /TiO 2 and the upper continental crust-normalized rare earth element and yttrium (REY) distribution patterns of the Zhongliangshan coals, the dominant sediment source regions are the Leshan-Longnvsi Uplift, Hannan Upland, and Dabashan Uplift, with a small proportion of terrigenous materials from the Kangdian Upland. The K7 and the upper portion of K1 coals have the potential as raw materials for the recovery of REY.

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Stone coal in China: a review

Cited by 89 publications

References 59 publications

Computational Fluid Dynamic Simulation of Inhaled Radon Dilution by Auxiliary Ventilation in a Stone-Coal Mine Laneway and Dosage Assessment of Miners

Computational Fluid Dynamic Simulation of Inhaled Radon Dilution by Auxiliary Ventilation in a Stone-Coal Mine Laneway and Dosage Assessment of Miners

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

Mineralogical and Geochemical Compositions of the Lopingian Coals in the Zhongliangshan Coalfield, Southwestern China

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