Distribution of Se in Floating Coals with Densimetric Fractions in China
Scholars at home and abroad have studied the concentrations of Se in coal and the relationship between Se and sulfur assignment. However, little attention has been paid to the study of Se in floating coal, especially the distribution pattern of Se in floating coal of densimetric fractions and the in...
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| Format: | Article |
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MDPI AG
2023-03-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/13/3/396 |
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| author | Guchun Zhang Qiyan Feng Heng Zhao Na Zhang Meng Wu Xiaoqing Wang Mingzhong Wen Yexin Deng Zhao Yang |
| author_facet | Guchun Zhang Qiyan Feng Heng Zhao Na Zhang Meng Wu Xiaoqing Wang Mingzhong Wen Yexin Deng Zhao Yang |
| author_sort | Guchun Zhang |
| collection | DOAJ |
| description | Scholars at home and abroad have studied the concentrations of Se in coal and the relationship between Se and sulfur assignment. However, little attention has been paid to the study of Se in floating coal, especially the distribution pattern of Se in floating coal of densimetric fractions and the influencing factors. A total of 138 coal samples were collected from 14 provinces and cities in China to test the Se and sulfur concentrations in coal, and we carried out the comparison of Se with forms of sulfur with 81 of them. A total of 10 coal samples were selected for float-and-sink analyses to investigate the distribution pattern of Se in floating coal. The results showed that the average Se concentration of Chinese coal was 2.26 μg/g, which is identical with the results of previous research studies, which found an average Se concentration of 2~3 μg/g. Selenium was not uniformly distributed in floating coals of densimetric fractions but it had some regularity. The main controlling factor was the sulfur content in the coal. The Se concentrations of the high-sulfur coal showed a “linear growth” distribution with an increasing density, the Se concentrations of the floating coal in each densimetric fraction increased slowly and the Se concentrations of the floating coal of a densimetric fraction > 2.00 g/cm<sup>3</sup> increased sharply. The other controlling factor was the ash yield of the coal. The Se concentrations of the low–medium-sulfur floating coal showed a “parabolic-like” distribution, i.e., low Se concentrations at both ends and high Se concentrations at the middle densimetric fraction. With the increase in the ash content of the coal from 18.23% to 51.92%, the densimetric fraction with the highest Se concentration gradually progressed from 1.40 g/cm<sup>3</sup> to 1.50 g/cm<sup>3</sup>, 1.60 g/cm<sup>3</sup> and 1.80 g/cm<sup>3</sup> in order. The correlation between the selenium of the raw coal from different regions and the total sulfur, pyrite sulfur and organic sulfur was not significant. However, there existed a significant correlation between Se, total sulfur, pyrite sulfur and organic sulfur in floating coals from the same mining area and depositional environment, among which pyrite sulfur was the most correlated with Se, followed by total sulfur and organic sulfur. |
| first_indexed | 2024-03-11T06:08:04Z |
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| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-11T06:08:04Z |
| publishDate | 2023-03-01 |
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| series | Minerals |
| spelling | doaj.art-2b084c50b2b44a04a81b179f88d7362f2023-11-17T12:48:01ZengMDPI AGMinerals2075-163X2023-03-0113339610.3390/min13030396Distribution of Se in Floating Coals with Densimetric Fractions in ChinaGuchun Zhang0Qiyan Feng1Heng Zhao2Na Zhang3Meng Wu4Xiaoqing Wang5Mingzhong Wen6Yexin Deng7Zhao Yang8School of Environment and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Environment and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Environment and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, ChinaJiangsu Design Institute of Geology for Mineral Resources (the Testing Center of China National Administration of Coal Geology (CNACG)), Xuzhou 221006, ChinaJiangsu Design Institute of Geology for Mineral Resources (the Testing Center of China National Administration of Coal Geology (CNACG)), Xuzhou 221006, ChinaSchool of Environment and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, ChinaJiangsu Design Institute of Geology for Mineral Resources (the Testing Center of China National Administration of Coal Geology (CNACG)), Xuzhou 221006, ChinaJiangsu Design Institute of Geology for Mineral Resources (the Testing Center of China National Administration of Coal Geology (CNACG)), Xuzhou 221006, ChinaJiangsu Design Institute of Geology for Mineral Resources (the Testing Center of China National Administration of Coal Geology (CNACG)), Xuzhou 221006, ChinaScholars at home and abroad have studied the concentrations of Se in coal and the relationship between Se and sulfur assignment. However, little attention has been paid to the study of Se in floating coal, especially the distribution pattern of Se in floating coal of densimetric fractions and the influencing factors. A total of 138 coal samples were collected from 14 provinces and cities in China to test the Se and sulfur concentrations in coal, and we carried out the comparison of Se with forms of sulfur with 81 of them. A total of 10 coal samples were selected for float-and-sink analyses to investigate the distribution pattern of Se in floating coal. The results showed that the average Se concentration of Chinese coal was 2.26 μg/g, which is identical with the results of previous research studies, which found an average Se concentration of 2~3 μg/g. Selenium was not uniformly distributed in floating coals of densimetric fractions but it had some regularity. The main controlling factor was the sulfur content in the coal. The Se concentrations of the high-sulfur coal showed a “linear growth” distribution with an increasing density, the Se concentrations of the floating coal in each densimetric fraction increased slowly and the Se concentrations of the floating coal of a densimetric fraction > 2.00 g/cm<sup>3</sup> increased sharply. The other controlling factor was the ash yield of the coal. The Se concentrations of the low–medium-sulfur floating coal showed a “parabolic-like” distribution, i.e., low Se concentrations at both ends and high Se concentrations at the middle densimetric fraction. With the increase in the ash content of the coal from 18.23% to 51.92%, the densimetric fraction with the highest Se concentration gradually progressed from 1.40 g/cm<sup>3</sup> to 1.50 g/cm<sup>3</sup>, 1.60 g/cm<sup>3</sup> and 1.80 g/cm<sup>3</sup> in order. The correlation between the selenium of the raw coal from different regions and the total sulfur, pyrite sulfur and organic sulfur was not significant. However, there existed a significant correlation between Se, total sulfur, pyrite sulfur and organic sulfur in floating coals from the same mining area and depositional environment, among which pyrite sulfur was the most correlated with Se, followed by total sulfur and organic sulfur.https://www.mdpi.com/2075-163X/13/3/396coalseleniumsulfurpyrite sulfurash contentfloating coal |
| spellingShingle | Guchun Zhang Qiyan Feng Heng Zhao Na Zhang Meng Wu Xiaoqing Wang Mingzhong Wen Yexin Deng Zhao Yang Distribution of Se in Floating Coals with Densimetric Fractions in China Minerals coal selenium sulfur pyrite sulfur ash content floating coal |
| title | Distribution of Se in Floating Coals with Densimetric Fractions in China |
| title_full | Distribution of Se in Floating Coals with Densimetric Fractions in China |
| title_fullStr | Distribution of Se in Floating Coals with Densimetric Fractions in China |
| title_full_unstemmed | Distribution of Se in Floating Coals with Densimetric Fractions in China |
| title_short | Distribution of Se in Floating Coals with Densimetric Fractions in China |
| title_sort | distribution of se in floating coals with densimetric fractions in china |
| topic | coal selenium sulfur pyrite sulfur ash content floating coal |
| url | https://www.mdpi.com/2075-163X/13/3/396 |
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