Abstract
Based on analysis of a large data set and supplementary sampling and analysis for hazardous trace elements in coal samples from the Huainan Coalfield, a generalized contrast-weighted scale index method was used to establish a model to evaluate the grade of coal cleanliness and its regional distribution in the main coal seam (No. 13-1) The results showed that: (1) The contents of Cr, Mn and Ni in the coal seam are relatively high and the average values are greater than 20 μg/g. The contents of Se and Hg are at a high level while most other trace elements are at normal levels. (2) The cleanliness grade of the coal seam is mainly grade III–IV, which corresponds to a relatively good-medium coal cleanliness grade. However, some parts of the seam are at grade V (relatively poor coal cleanliness). (3) Coal of relatively good cleanliness grade (grade III) is distributed mainly in the regions corresponding to the Zhuji-Dingji-Gubei coal mines and in the eastern periphery of the Panji coal mine. Coal of medium cleanliness (grade IV) is distributed mainly in the regions of the Panji-Xiejiaji and Kouzidong coalmines. Relatively poor grade coal (grade V) is distributed in the southwest regions of the coalfield and the contents of Cr, As and Hg in coal collected from the relatively poor coal cleanliness regions often exceed the regulatory standards for the maximum concentration limits.
Highlights
According to the yearbook of China’s National Bureau of Statistics, by the end of 2017, coal accounted for 60.4% of China’s primary energy consumption structure, a change of the coal-dominated energy structure to greener sources of energy in the short-term would be challenging.Research concerning the evaluation of coal resources in terms of their coal cleanliness grade has important implications for environmental, social and economic significance (Tang et al 2006; Yang et al 2011)
Based on analysis of a large data set and supplementary sampling and analysis for hazardous trace elements in coal samples from the Huainan Coalfield, a generalized contrast-weighted scale index method was used to establish a model to evaluate the grade of coal cleanliness and its regional distribution in the main coal seam (No 13-1) The results showed that: (1) The contents of Cr, Mn and Ni in the coal seam are relatively high and the average values are greater than 20 lg/g
The Huainan Coalfield is divided into the Huainan mining area, the Panji mining area and the Fudong mining area going from east to west (Fig. 1)
Summary
According to the yearbook of China’s National Bureau of Statistics, by the end of 2017, coal accounted for 60.4% of China’s primary energy consumption structure, a change of the coal-dominated energy structure to greener sources of energy in the short-term would be challenging. Limited by a lack of regional research, many researchers have their own opinions on the criteria for selection of evaluation indexes for coal cleanliness, the indices normally include Ad, St, d, F, Cl and potentially toxic trace elements in coal. According to Yang and Ye (2017), in terms of the regional spatial distribution, a high-low concentration zone has been established as a focal point of air pollution in Anhui Province, due mainly to the large number of coal-fired power plants in the Huainan Coalfield. Comprehensive research concerning an evaluation of the cleanliness grades of coal resources in the Huainan Coalfield has been undertaken by taking into account key factors such as coal quality, and the chemical properties and concentrations of typical hazardous trace elements in the coals. The No 13-1 coal seam, the main coal seam of the Huainan Coalfield, has been examined systematically and the environmental impact of pollution from the release of hazardous trace elements as a result of coal processing and utilization are discussed
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