Role of the Polar Proportion of Compound Collectors in Low-Rank Coal Flotation Upgrading: Insights from the Molecular Scale
The compound collector, composed of polar and nonpolar parts, is a current research hotspot in low-rank coal (LRC) flotation because of its outstanding flotation efficiency and cost-effectiveness. However, the selection of compound proportions lacks theoretical guidance. In this study, we comprehens...
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| Format: | Article |
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MDPI AG
2023-04-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/13/4/524 |
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| author | Junling Liu Xicheng Bao Yesheng Hao Jincheng Liu Yulong Cheng Rui Zhang Yaowen Xing Xiahui Gui Jihui Li Budeebazar Avid |
| author_facet | Junling Liu Xicheng Bao Yesheng Hao Jincheng Liu Yulong Cheng Rui Zhang Yaowen Xing Xiahui Gui Jihui Li Budeebazar Avid |
| author_sort | Junling Liu |
| collection | DOAJ |
| description | The compound collector, composed of polar and nonpolar parts, is a current research hotspot in low-rank coal (LRC) flotation because of its outstanding flotation efficiency and cost-effectiveness. However, the selection of compound proportions lacks theoretical guidance. In this study, we comprehensively investigate the internal mechanism underlying the influence of the compound proportion (oleic acid (OA):dodecane (DD)) on LRC flotation. The molecular dynamics (MD) simulation between bubble and oil film was simultaneously employed to study the surface interactions between three phases in contact. The compound proportion of OA:DD = 1:3 was found to be the most conductive for Zhuanlongwan coal flotation, which provides a robust collecting capacity while minimizing excessive interaction with water. Thus, the spreading area is the largest and the interaction energy between collectors and LRC is the highest. Additionally, the oil film formed at this ratio has the best hydrophobicity, resulting in the fastest adhesion speed of the bubble and the most stable bubble adhesion. Proportions of OA:DD above 1:3 promote self-aggregation of polar collectors, leading to a worsened spreading of the oil film. Conversely, proportions below 1:3 result in weak interaction with LRC, leading to a smaller spreading area and reduced hydrophobicity. Ultimately, we propose the LRC–compound collector matching principle, which suggests that the best proportion of compound collectors fits well with the oxygen-containing sites on the LRC surface. |
| first_indexed | 2024-03-11T04:42:52Z |
| format | Article |
| id | doaj.art-c3a38613484d4d4aa7742109eb730f70 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-11T04:42:52Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
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| series | Minerals |
| spelling | doaj.art-c3a38613484d4d4aa7742109eb730f702023-11-17T20:35:56ZengMDPI AGMinerals2075-163X2023-04-0113452410.3390/min13040524Role of the Polar Proportion of Compound Collectors in Low-Rank Coal Flotation Upgrading: Insights from the Molecular ScaleJunling Liu0Xicheng Bao1Yesheng Hao2Jincheng Liu3Yulong Cheng4Rui Zhang5Yaowen Xing6Xiahui Gui7Jihui Li8Budeebazar Avid9Henan Energy Group Co., Ltd., Zhengzhou 450046, ChinaSchool of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, ChinaChinese National Engineering Research Center of Coal Preparation and Purification, Xuzhou 221116, ChinaChinese National Engineering Research Center of Coal Preparation and Purification, Xuzhou 221116, ChinaSchool of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaInstitute of Chemistry and Chemical Technology, Mongolian Academy of Sciences, Ulaanbaatar 13330, MongoliaThe compound collector, composed of polar and nonpolar parts, is a current research hotspot in low-rank coal (LRC) flotation because of its outstanding flotation efficiency and cost-effectiveness. However, the selection of compound proportions lacks theoretical guidance. In this study, we comprehensively investigate the internal mechanism underlying the influence of the compound proportion (oleic acid (OA):dodecane (DD)) on LRC flotation. The molecular dynamics (MD) simulation between bubble and oil film was simultaneously employed to study the surface interactions between three phases in contact. The compound proportion of OA:DD = 1:3 was found to be the most conductive for Zhuanlongwan coal flotation, which provides a robust collecting capacity while minimizing excessive interaction with water. Thus, the spreading area is the largest and the interaction energy between collectors and LRC is the highest. Additionally, the oil film formed at this ratio has the best hydrophobicity, resulting in the fastest adhesion speed of the bubble and the most stable bubble adhesion. Proportions of OA:DD above 1:3 promote self-aggregation of polar collectors, leading to a worsened spreading of the oil film. Conversely, proportions below 1:3 result in weak interaction with LRC, leading to a smaller spreading area and reduced hydrophobicity. Ultimately, we propose the LRC–compound collector matching principle, which suggests that the best proportion of compound collectors fits well with the oxygen-containing sites on the LRC surface.https://www.mdpi.com/2075-163X/13/4/524low-rank coal flotationcompound collectoroptimal proportionMD simulation |
| spellingShingle | Junling Liu Xicheng Bao Yesheng Hao Jincheng Liu Yulong Cheng Rui Zhang Yaowen Xing Xiahui Gui Jihui Li Budeebazar Avid Role of the Polar Proportion of Compound Collectors in Low-Rank Coal Flotation Upgrading: Insights from the Molecular Scale Minerals low-rank coal flotation compound collector optimal proportion MD simulation |
| title | Role of the Polar Proportion of Compound Collectors in Low-Rank Coal Flotation Upgrading: Insights from the Molecular Scale |
| title_full | Role of the Polar Proportion of Compound Collectors in Low-Rank Coal Flotation Upgrading: Insights from the Molecular Scale |
| title_fullStr | Role of the Polar Proportion of Compound Collectors in Low-Rank Coal Flotation Upgrading: Insights from the Molecular Scale |
| title_full_unstemmed | Role of the Polar Proportion of Compound Collectors in Low-Rank Coal Flotation Upgrading: Insights from the Molecular Scale |
| title_short | Role of the Polar Proportion of Compound Collectors in Low-Rank Coal Flotation Upgrading: Insights from the Molecular Scale |
| title_sort | role of the polar proportion of compound collectors in low rank coal flotation upgrading insights from the molecular scale |
| topic | low-rank coal flotation compound collector optimal proportion MD simulation |
| url | https://www.mdpi.com/2075-163X/13/4/524 |
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