Analysis of mercury speciations in Late Permian coal from the border area of Yunnan, Guizhou and Sichuan provinces
CAO Qing-yi1,2, LIANG Han-dong1,2, LI Chun-hui2, YANG Liu2
1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, China;
2. College of Geoscience and Surveying Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China
The Late Permian coal samples were collected from the border area of Yunnan, Guizhou and Sichuan provinces to analyze the mercury release behavior in the different atmospheres (argon, nitrogen and pure oxygen) and the mercury speciations in coal, using RA-915 mercury analyzer combined with temperature programmed pyrolysis instrument. The results showed that when the coal was pyrolyzed in the reducing environment, the release range of mercury was wider, and it showed obvious stage release characteristics due to the multiple mercury speciations. In the nitrogen and argon atmosphere, the mercury release behavior was nearly uniform. When the coal was pyrolyzed in the oxygen atmosphere, HgS, HgSO4 and HgO may be released in the transitional forms of HgSO4·HgO and HgSO4·2HgO, and the mercury release range was relatively concentrated. The mercury speciations in the Late Permian coal from the study area is dominated by HgS and HgSO4, and a certain amount of HgO is present in some coal samples.
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CAO Qing-yi, LIANG Han-dong, LI Chun-hui, YANG Liu. Analysis of mercury speciations in Late Permian coal from the border area of Yunnan, Guizhou and Sichuan provinces. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(9): 3959-3966.
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