Mineralogy and geochemistry of Late Permian coals from the Donglin Coal Mine in the Nantong coalfield in Chongqing, southwestern China

Chen, Jian; Chen, Ping; Yao, Duoxi; Liu, Zhen; Wu, Yingshuang; Liu, Wenzhong; Hu, Youbiao

doi:10.1016/j.coal.2015.06.014

Cited by 66 publications

(43 citation statements)

References 97 publications

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“…The limits of mercury concentration for coal-fired power plant flue gas was set at less than 0.03 mg/Nm 3 according to the Chinese standard GB/T 13223-2011. The distribution and occurrence of mercury in coals from various coal basins in China had been reported intensively (Dai and Ren 2007;Liu et al 2007;Song et al 2007;Wang et al 2007;Zheng et al 2007Zheng et al , 2008Li et al 2012;Jiang et al 2015), especially those with higher content of mercury from Southwest China (Dai et al 2006a(Dai et al , 2008Wang 2009;Wang et al 2012;Zhuang et al 2012;Dai et al 2013aDai et al , b, 2014Chen et al 2015;Li et al 2016).…”

Section: Introductionmentioning

confidence: 99%

The distribution and occurrence of mercury in Chinese coals

Bai

Wang

et al. 2017

Int J Coal Sci Technol

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Mercury is one of the most concerned hazardous elements in coals. 1018 coal samples of different coal-forming periods, coal-accumulating areas and coal ranks all over the country were collected to study the distributions of mercury in Chinese coals. The modes of occurrence of mercury were studied with float-sink experiments of 10 coals from different basins in China and correlation analyses were conducted between concentrations of mercury and maceral and sulfur contents, as well as the ash yield. The theoretic concentrations and affinities of mercury in vitrinite, inertinite, clay and pyrite were then calculated following the methods proposed by Solari. The weighted average concentration of mercury in Chinese coals is 0.154 lg/g, which is similar to that in the word coals in general. The mercury concentrations vary largely in the coals of different coal-forming period and coal-accumulating areas as geological settings play key roles in determining the geochemistry of mercury. The concentrations of mercury in coals from south and southwest China and those from North China of C 3 -P 1 are relatively higher while those from North China of J 1-2 and Northeast of J 3 -K 1 relatively lower. The general distribution trends of mercury are very similar to that of ash yield, sulfur contents in coals. Pyrite is the dominant carrier of mercury in most coals, especially in some high-sulfur coals with abundant epigenetic pyrite formed during diagenesis and metamorphism. Mercury has higher affinity to vitrinite than to inertinite in most coals, which accords with the geological origin of macerals and geochemistry of mercury.

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Section: Introductionmentioning

confidence: 99%

The distribution and occurrence of mercury in Chinese coals

Bai

Wang

et al. 2017

Int J Coal Sci Technol

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“…Chen and Tang [7] investigated fluorine in Chinese coal, finding that F was significantly enriched in coal of the late Permian Longtan formation coal in Laochang, Yunnan, with a mean of 1977.2 mg/kg based on 29 samples (CC > 10). In surrounding areas, F was also enriched in coal of Zhijin, Nantong, Songzao and Lingcang Dazhai coal, with respective means of 500 mg/kg, 429 mg/kg, 440 mg/kg, 369 mg/kg (CC ≥ 5) [19][20][21][22]53]. In addition, fluorine in Jurassic coal from Muli, Qinghai was slightly enriched (CC > 2), with a mean value of 253 mg/kg [49].…”

Section: Enrichment Of Fluorine In Coalmentioning

confidence: 91%

“…In other districts, the F in coal had a similar content to the averages worldwide or in China [15,17,[53][54][55]. and Lingcang Dazhai coal, with respective means of 500 mg/kg, 429 mg/kg, 440 mg/kg, 369 mg/kg (CC ≥ 5) [19][20][21][22]53]. In addition, fluorine in Jurassic coal from Muli, Qinghai was slightly enriched (CC > 2), with a mean value of 253 mg/kg [49].…”

Section: Enrichment Of Fluorine 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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“…The arsenic enrichment in Guizhou coals resulted from the epigenetic low-temperature hydrothermal fluids. Chen et al [151] also found that arsenic primarily associated with pyrite in the Donglin coal from Nantong coalfield of Chongqing.…”

Section: Sulfide-associationmentioning

confidence: 99%

“…15 coal of Qinshui Basin [150], the Nos. 4 and 6 coals of the Donglin coal mine in Nantong coalfield of Chongqing [151], and the No. 24 coal of the Taiping coal mine in the Panzhihua; (3) Arsenic enriches in the floor while depletes in the coal seam, e.g., the No.…”

Section: Profile Distribution Of Arsenic In Chinese Coalsmentioning

confidence: 99%

Distribution, Enrichment and Modes of Occurrence of Arsenic in Chinese Coals

et al. 2017

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Abstract:Arsenic is one of the toxic trace elements in coals, which is harmful to both the ecological environment and human health. Based on published literature and the data obtained by our research group, a total of 5314 As concentrations of Chinese coals were analyzed. The arithmetic mean of arsenic content in Chinese coals is 6.97 mg/kg. Choosing the percentage of provincial coal resources in national coal resources as the weighting factor, the weighted average of arsenic content in Chinese coals is 5.33 mg/kg. The content of arsenic in Chinese coals increases from the north to the south. High arsenic content in coal primarily occurs in southwestern Yunnan and certain coalfields in the Guizhou Province. Additionally, arsenic is enriched in the coals from some regions, i.e., the western Yunnan, Guangxi, Tibet, southwestern Liaoning, Jilin, and Henan. The arsenic content in coals of different coal-forming periods shows an overall regularity: Paleogene and Neogene > Late Triassic > Late Permian > Late Jurassic and Early Cretaceous > Early and Middle Jurassic > Late Carboniferous and Early Permian. The modes of occurrence of arsenic in coals include sulfide-association, organic-association, arsenate-association, silicate-association, and soluble-and exchangeable-association. Generally, arsenic in Chinese coals exists predominantly in arsenic-bearing pyrite. Meanwhile, the organic arsenic content is relatively high in coal samples with a lower (<5.5 mg/kg) arsenic content and a low or medium ash yield (<30%).

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Mineralogy and geochemistry of Late Permian coals from the Donglin Coal Mine in the Nantong coalfield in Chongqing, southwestern China

Cited by 66 publications

References 97 publications

The distribution and occurrence of mercury in Chinese coals

The distribution and occurrence of mercury in Chinese coals

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

Distribution, Enrichment and Modes of Occurrence of Arsenic in Chinese Coals

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