Enrichment Characteristics of Hazardous Trace Elements in Feed Coal and Coal Ash in Huaibei Area under Leaching
This research focused on the hazardous elements in the main coal seam of Huaibei coalfield, China. Through collecting 20 feed coal samples from different coal seams of nine coal mines in the region, and combining with XRF, XRD, ICP-MS, and sequential chemical extraction, the mineral composition and...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-03-01
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| Series: | Toxics |
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| Online Access: | https://www.mdpi.com/2305-6304/11/4/308 |
| _version_ | 1797603358546067456 |
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| author | Degao Wang Jianwei Lu Jian Wu Bo Li Ndhlovu Kataza Nyasha |
| author_facet | Degao Wang Jianwei Lu Jian Wu Bo Li Ndhlovu Kataza Nyasha |
| author_sort | Degao Wang |
| collection | DOAJ |
| description | This research focused on the hazardous elements in the main coal seam of Huaibei coalfield, China. Through collecting 20 feed coal samples from different coal seams of nine coal mines in the region, and combining with XRF, XRD, ICP-MS, and sequential chemical extraction, the mineral composition and the contents of major elements and HEs for feed coal were analyzed. Compared with previous research results, the enrichment characteristics of HEs in feed coal were revealed. The leaching behaviors of Se, Hg, and Pb in feed coal and coal ash under different leaching conditions were analyzed in depth by using a leaching device independently developed. Results showed that, compared with Chinese coals and World coals, the content of other elements, except Se, Sb, Hg, and Pb, in feed coal of Huaibei coalfield were at the “Normal” level, and no “Low” level elements were found; as the acidity of leaching solution decreased, the relative leaching rate of Se (<i>L<sub>Se</sub></i>) was gradually increasing, while the <i>L<sub>Hg</sub></i> and <i>L<sub>Pb</sub></i> were not obvious; the <i>L<sub>Se</sub></i> in feed coal and coal ash had a great relationship with the modes of occurrence of Se. The difference in the Hg content in the ion exchange state in feed coal may be an important reason for the difference in Hg leaching behavior. However, the content of Pb in feed coal had little influence on its leaching behavior. The modes of occurrence of Pb determined that the <i>L<sub>Pb</sub></i> in feed coal and coal ash was not high. The <i>L<sub>Se</sub></i> increased with the increase in acidity of leaching solution and leaching time. The leaching time was the main influencing factor of the <i>L<sub>Hg</sub></i> and <i>L<sub>Pb</sub></i>. |
| first_indexed | 2024-03-11T04:28:03Z |
| format | Article |
| id | doaj.art-5e56e47d1eac457abe5152e39e3645dd |
| institution | Directory Open Access Journal |
| issn | 2305-6304 |
| language | English |
| last_indexed | 2024-03-11T04:28:03Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Toxics |
| spelling | doaj.art-5e56e47d1eac457abe5152e39e3645dd2023-11-17T21:37:01ZengMDPI AGToxics2305-63042023-03-0111430810.3390/toxics11040308Enrichment Characteristics of Hazardous Trace Elements in Feed Coal and Coal Ash in Huaibei Area under LeachingDegao Wang0Jianwei Lu1Jian Wu2Bo Li3Ndhlovu Kataza Nyasha4College of Geology and Construction Engineering, Anhui Technical College of Industry and Economy, Hefei 230051, ChinaKey Laboratory of Intelligent Underground Exploration, College of Civil Engineering, Anhui Jianzhu University, Hefei 230601, ChinaKey Laboratory of Intelligent Underground Exploration, College of Civil Engineering, Anhui Jianzhu University, Hefei 230601, ChinaKey Laboratory of Intelligent Underground Exploration, College of Civil Engineering, Anhui Jianzhu University, Hefei 230601, ChinaKey Laboratory of Intelligent Underground Exploration, College of Civil Engineering, Anhui Jianzhu University, Hefei 230601, ChinaThis research focused on the hazardous elements in the main coal seam of Huaibei coalfield, China. Through collecting 20 feed coal samples from different coal seams of nine coal mines in the region, and combining with XRF, XRD, ICP-MS, and sequential chemical extraction, the mineral composition and the contents of major elements and HEs for feed coal were analyzed. Compared with previous research results, the enrichment characteristics of HEs in feed coal were revealed. The leaching behaviors of Se, Hg, and Pb in feed coal and coal ash under different leaching conditions were analyzed in depth by using a leaching device independently developed. Results showed that, compared with Chinese coals and World coals, the content of other elements, except Se, Sb, Hg, and Pb, in feed coal of Huaibei coalfield were at the “Normal” level, and no “Low” level elements were found; as the acidity of leaching solution decreased, the relative leaching rate of Se (<i>L<sub>Se</sub></i>) was gradually increasing, while the <i>L<sub>Hg</sub></i> and <i>L<sub>Pb</sub></i> were not obvious; the <i>L<sub>Se</sub></i> in feed coal and coal ash had a great relationship with the modes of occurrence of Se. The difference in the Hg content in the ion exchange state in feed coal may be an important reason for the difference in Hg leaching behavior. However, the content of Pb in feed coal had little influence on its leaching behavior. The modes of occurrence of Pb determined that the <i>L<sub>Pb</sub></i> in feed coal and coal ash was not high. The <i>L<sub>Se</sub></i> increased with the increase in acidity of leaching solution and leaching time. The leaching time was the main influencing factor of the <i>L<sub>Hg</sub></i> and <i>L<sub>Pb</sub></i>.https://www.mdpi.com/2305-6304/11/4/308hazardous elementsenrichment characteristicsleaching behaviorHuaibei coalfield |
| spellingShingle | Degao Wang Jianwei Lu Jian Wu Bo Li Ndhlovu Kataza Nyasha Enrichment Characteristics of Hazardous Trace Elements in Feed Coal and Coal Ash in Huaibei Area under Leaching Toxics hazardous elements enrichment characteristics leaching behavior Huaibei coalfield |
| title | Enrichment Characteristics of Hazardous Trace Elements in Feed Coal and Coal Ash in Huaibei Area under Leaching |
| title_full | Enrichment Characteristics of Hazardous Trace Elements in Feed Coal and Coal Ash in Huaibei Area under Leaching |
| title_fullStr | Enrichment Characteristics of Hazardous Trace Elements in Feed Coal and Coal Ash in Huaibei Area under Leaching |
| title_full_unstemmed | Enrichment Characteristics of Hazardous Trace Elements in Feed Coal and Coal Ash in Huaibei Area under Leaching |
| title_short | Enrichment Characteristics of Hazardous Trace Elements in Feed Coal and Coal Ash in Huaibei Area under Leaching |
| title_sort | enrichment characteristics of hazardous trace elements in feed coal and coal ash in huaibei area under leaching |
| topic | hazardous elements enrichment characteristics leaching behavior Huaibei coalfield |
| url | https://www.mdpi.com/2305-6304/11/4/308 |
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