Synergistic effects of dodecane-castor oil acid mixture on the flotation responses of low-rank coal: A combined simulation and experimental study
The utilization of an appropriate collector or surfactant is crucial for the beneficiation of low-rank coal. However, in previous studies, the selection of surfactants was primarily based on flotation procedures, which hinders the understanding of the interaction mechanism between surfactant groups...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-05-01
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| Series: | International Journal of Mining Science and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2095268623000162 |
| _version_ | 1797813760625213440 |
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| author | Fen Xu Shiwei Wang Rongjie Kong Chengyong Wang |
| author_facet | Fen Xu Shiwei Wang Rongjie Kong Chengyong Wang |
| author_sort | Fen Xu |
| collection | DOAJ |
| description | The utilization of an appropriate collector or surfactant is crucial for the beneficiation of low-rank coal. However, in previous studies, the selection of surfactants was primarily based on flotation procedures, which hinders the understanding of the interaction mechanism between surfactant groups and oxygen-containing functional groups at the surface of low-rank coal. In this study, we investigate the flotation of low-rank coal in the presence of a composite collector by using a combined theoretical and experimental approach. The maximum flotation mass recovery achieved was 82.89% using a 3:1 mixture of dodecane and castor oil acid. Fourier-transform infrared and X-ray photoelectron spectroscopic analyses showed that castor oil acid was effectively adsorbed onto the surface of low-rank coal, enhancing the hydrophobicity of the coal. In addition, the diffusion coefficient of water molecules in the water-composite collector-coal system was greater than that in the dodecane system. Moreover, due to the presence of castor oil acid in the flotation process, the adsorption distance of dodecane and low-rank coal became shorter. Molecular dynamics simulations revealed that the diffusion and interaction of surfactant molecules at the interface of low-rank coal particles and water was enhanced because the adsorption of the dodecane-castor oil acid mixture is primarily controlled by hydrogen bonds and electrostatic attraction. Based on these results, a better surfactant for flotation of low-rank coal is also proposed. |
| first_indexed | 2024-03-13T07:57:31Z |
| format | Article |
| id | doaj.art-dac4c8067b9a4179b9bee132a2afd7fd |
| institution | Directory Open Access Journal |
| issn | 2095-2686 |
| language | English |
| last_indexed | 2024-03-13T07:57:31Z |
| publishDate | 2023-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Mining Science and Technology |
| spelling | doaj.art-dac4c8067b9a4179b9bee132a2afd7fd2023-06-02T04:23:00ZengElsevierInternational Journal of Mining Science and Technology2095-26862023-05-01335649658Synergistic effects of dodecane-castor oil acid mixture on the flotation responses of low-rank coal: A combined simulation and experimental studyFen Xu0Shiwei Wang1Rongjie Kong2Chengyong Wang3College of Environmental and Chemical Engineering, Dalian University, Dalian 116622, China; School of Mines and Mechanical Engineering, Liupanshui Normal University, Liupanshui 553004, ChinaCollege of Environmental and Chemical Engineering, Dalian University, Dalian 116622, China; School of Mines and Mechanical Engineering, Liupanshui Normal University, Liupanshui 553004, China; Corresponding author.College of Environmental and Chemical Engineering, Dalian University, Dalian 116622, China; School of Mines and Mechanical Engineering, Liupanshui Normal University, Liupanshui 553004, ChinaSchool of Mines and Mechanical Engineering, Liupanshui Normal University, Liupanshui 553004, ChinaThe utilization of an appropriate collector or surfactant is crucial for the beneficiation of low-rank coal. However, in previous studies, the selection of surfactants was primarily based on flotation procedures, which hinders the understanding of the interaction mechanism between surfactant groups and oxygen-containing functional groups at the surface of low-rank coal. In this study, we investigate the flotation of low-rank coal in the presence of a composite collector by using a combined theoretical and experimental approach. The maximum flotation mass recovery achieved was 82.89% using a 3:1 mixture of dodecane and castor oil acid. Fourier-transform infrared and X-ray photoelectron spectroscopic analyses showed that castor oil acid was effectively adsorbed onto the surface of low-rank coal, enhancing the hydrophobicity of the coal. In addition, the diffusion coefficient of water molecules in the water-composite collector-coal system was greater than that in the dodecane system. Moreover, due to the presence of castor oil acid in the flotation process, the adsorption distance of dodecane and low-rank coal became shorter. Molecular dynamics simulations revealed that the diffusion and interaction of surfactant molecules at the interface of low-rank coal particles and water was enhanced because the adsorption of the dodecane-castor oil acid mixture is primarily controlled by hydrogen bonds and electrostatic attraction. Based on these results, a better surfactant for flotation of low-rank coal is also proposed.http://www.sciencedirect.com/science/article/pii/S2095268623000162Low-rank coalFlotationCastor oil acidSurface hydrophobicityMolecular dynamics simulation |
| spellingShingle | Fen Xu Shiwei Wang Rongjie Kong Chengyong Wang Synergistic effects of dodecane-castor oil acid mixture on the flotation responses of low-rank coal: A combined simulation and experimental study International Journal of Mining Science and Technology Low-rank coal Flotation Castor oil acid Surface hydrophobicity Molecular dynamics simulation |
| title | Synergistic effects of dodecane-castor oil acid mixture on the flotation responses of low-rank coal: A combined simulation and experimental study |
| title_full | Synergistic effects of dodecane-castor oil acid mixture on the flotation responses of low-rank coal: A combined simulation and experimental study |
| title_fullStr | Synergistic effects of dodecane-castor oil acid mixture on the flotation responses of low-rank coal: A combined simulation and experimental study |
| title_full_unstemmed | Synergistic effects of dodecane-castor oil acid mixture on the flotation responses of low-rank coal: A combined simulation and experimental study |
| title_short | Synergistic effects of dodecane-castor oil acid mixture on the flotation responses of low-rank coal: A combined simulation and experimental study |
| title_sort | synergistic effects of dodecane castor oil acid mixture on the flotation responses of low rank coal a combined simulation and experimental study |
| topic | Low-rank coal Flotation Castor oil acid Surface hydrophobicity Molecular dynamics simulation |
| url | http://www.sciencedirect.com/science/article/pii/S2095268623000162 |
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