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| DOI | 10.1016/j.egyr.2021.11.055 |
| Characteristics of pores in coals exposed to acid mine drainage | |
| Tang, Hao; Luo, Jin-zhi; Zheng, Li-wei; Liu, Chi-yang; Li, Hua-hua; Wu, Guan-nan; Zeng, Meng-li; Bai, Xue-song | |
| 通讯作者 | Luo, JZ (通讯作者)，Xian Univ Sci & Technol, Coll Geol & Environm, Xian 710054, Shaanxi, Peoples R China. |
| 发表日期 | 2021 |
| ISSN | 2352-4847 |
| 起始页码 | 8772 |
| 结束页码 | 8783 |
| 卷号 | 7 |
| 英文摘要 | Acid mine drainage commonly occupies some pore space after underground coal mining, and this severely depreciates coal pillars, thereby posing a significant risk to mine stability. Considering that such depreciation is reflected in the microstructures of these pillars, in the present study, we propose a static immersion method suitable for coal seam samples immersion in the laboratory. We immersed the No. 2-2 coal seam samples from the Ningtiao Tower Coal Mine in Yulin, Shaanxi Province, in different acid mine drainage solutions and monitored the pH, oxidation-reduction potential (ORP), electrical conductivity (EC), total dissolved solids (TDS) among other water quality parameters for 300 h. After the immersion tests, samples were examined using scanning electron microscopy (SEM). The pH, ORP, EC, and TDS of the prepared acid mine drainage solutions increased significantly as the immersion time increased. Changes in water quality parameters are attributed to the absorption of hydrogen ions by insoluble clay minerals in the coal, which reduced the acidity, increased the pH value, and enhanced the electrical conductivity of the acid mine drainage solutions. SEM analysis reveals differences in the pore characteristics of (pore throat size and orientation) of the coal samples, and these are caused by erosive effects of the acid mine drainage solutions. Pores with throat sizes greater than 10 mu m increased by 95% as the pH of the acid mine drainage solutions decreased, while the dominant pore orientation (60-90 degrees) decreased to the 0-30 degrees or increased to the 150-180 degrees range, thereby increasing their randomness. (C) 2021 Published by Elsevier Ltd. |
| 关键词 | BROWN-COALLEACHING BEHAVIORKARST WATERGANGUEIMPACTQUANTIFICATIONCOALFIELDPOLLUTIONSEDIMENTKINETICS |
| 英文关键词 | Acid mine drainage; Chemical erosion; Immersion test; Pore orientation; Pore size |
| 语种 | 英语 |
| WOS研究方向 | Energy & Fuels |
| WOS类目 | Energy & Fuels |
| WOS记录号 | WOS:000727748600005 |
| 来源期刊 | ENERGY REPORTS
 |
| 来源机构 | 中国科学院西北生态环境资源研究院 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/255127 |
| 作者单位 | [Tang, Hao; Luo, Jin-zhi; Zheng, Li-wei; Zeng, Meng-li] Xian Univ Sci & Technol, Coll Geol & Environm, Xian 710054, Shaanxi, Peoples R China; [Tang, Hao] Key Lab Geol Support Coal Green Exploitat, Xian 710054, Shaanxi, Peoples R China; [Liu, Chi-yang] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China; [Liu, Chi-yang] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Li, Hua-hua] Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Xian 710049, Peoples R China; [Bai, Xue-song] Shaanxi Railway Inst, Sch Urban Railway Engn, Weinan 714000, Peoples R China; [Wu, Guan-nan] Wuhan Surveying Geotech Res Inst Co LTD MCC, Wuhan 430080, Hubei, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tang, Hao,Luo, Jin-zhi,Zheng, Li-wei,et al. Characteristics of pores in coals exposed to acid mine drainage[J]. 中国科学院西北生态环境资源研究院,2021,7. |
| APA | Tang, Hao.,Luo, Jin-zhi.,Zheng, Li-wei.,Liu, Chi-yang.,Li, Hua-hua.,...&Bai, Xue-song.(2021).Characteristics of pores in coals exposed to acid mine drainage.ENERGY REPORTS,7. |
| MLA | Tang, Hao,et al."Characteristics of pores in coals exposed to acid mine drainage".ENERGY REPORTS 7(2021). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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