Variation of Hg content in low sulfur coals in relation to the coal-forming environment: a case study from Zhuji Coal Mine, Huainan Coalfield, North China
- 90 Downloads
Twenty-nine low sulfur coal samples were selected to determine the magnitude and variability of mercury (Hg) content in a well-documented stratigraphy system including ten continuous coal seams in Zhuji Coal Mine, Huainan Coalfield, Anhui Province, North China. Mercury content of samples was measured on a direct mercury analyzer and confident results were obtained as evaluated by standard references, sample replicates and procedural blanks. The calculated overall mine average Hg content is 71.19 ± 9.28 ng/g based on seam averages and weighting by the estimated reserve of each coal seam. The estimated Hg emission potential for Huainan coalfield is obviously lower than that calculated from coal emission factor in industrial use. An increasing trend of Hg content with the evolution of depositional environment was observed from Nos. 3 to 11-2 coal seams. Combining the evidence of sedimentology and paleontology, a better understanding was gained of the mechanism of Hg sequestration in specific coal benches. A large portion of Hg residing in the low sulfur coals presumably integrated to the functional groups of organic constitution, whereas pyrite was generally abundant in the high sulfur coals.
KeywordsMercury Coal Low sulfur Coal-forming environment Huainan coalfield
We acknowledge supports from the National Natural Science Foundation of China (No. 41502152), China Postdoctoral Science Foundation (Nos. 2016T90576 and 2015M571940), the National Key Basic Research and Development Program of China (2016YFC0201600), the National Basic Research Program of China (973 Program, 2014CB238903), the Open Projects of Research Center of Coal Resources Safe Mining and Clean Utilization, Liaoning (LNTU17KF10) and Science and Technology Project of Department of Land and Resources of Anhui Province (2016-K-2).
- Carpi A (1997) Mercury from combustion sources: a review of the chemical species emitted and their transport in the atmosphere. Water Air Soil Pollut 98:241–254Google Scholar
- Chou CL (1990) Geochemistry of sulfur in coal, geochemistry of sulfur in fossil fuels. American Chemical Society, New York, pp. 30–52Google Scholar
- Dong Y, Lan CY, Zeng QP, Yang BC (1994) Lithofacies and paleogeography from Late Carboniferous to early stage of Late Permian in Huainan–Huaibei coalfields. Coal Geol Explor 22:9–12Google Scholar
- Fester JI, Robinson WE (1966) Oxygen functional groups in green river oil-shale Kerogen and trona acids, coal science. American Chemical Society, New York, pp. 22–31Google Scholar
- Gao LF, Chou L,GJ, Zheng CL, Zheng LG, W (2005) The study of sulfur geochemistry in Chinese coals. Bull Mineral Petrol Geochem 24:79–87Google Scholar
- Liu GJ, Zheng L, Zhang Y, Qi C, Chen Y, Peng Z (2007) Distribution and mode of occurrence of As, Hg and Se and Sulfur in coal Seam 3 of the Shanxi Formation, Yanzhou Coalfield, China. Int J Coal Geol 71(2–3):371–385Google Scholar
- Streets DG, Hao J, Wang S, Wu Y (2009b) Mercury emissions from coal combustion in China. In: Mason R, Pirrone N (eds), Mercury fate and transport in the global atmosphere, Springer, New York, pp 51–65Google Scholar
- Sun R, Liu G, Zheng L, Chou C-L (2010b) Characteristics of coal quality and their relationship with coal-forming environment: a case study from the Zhuji exploration area, Huainan coalfield. Anhui Chin Energy 35:423–435Google Scholar