Effect of oil film thickness on the interaction behavior between low-rank coal particle and oily bubble.
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| Title: | Effect of oil film thickness on the interaction behavior between low-rank coal particle and oily bubble. |
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| Authors: | Wang, Yali1,2 (AUTHOR), Wang, Man1,3 (AUTHOR), Liu, Guangshan1,3 (AUTHOR), Liao, Xiangguo1,4 (AUTHOR), Yang, Haichang1,2 (AUTHOR) haichangyang@163.com |
| Source: | International Journal of Coal Preparation & Utilization. 2026, Vol. 46 Issue 6, p1885-1899. 15p. |
| Subject Terms: | *Flotation, *Electrostatic interaction, *Gas-liquid interfaces, *Lignite |
| Abstract: | At present, there is a lack of systematic research on the mechanism by which oil film thickness affects the interactions between low-rank coal particles and bubbles. This study systematically examines the effect of oil film thickness on the interaction mechanisms between low-rank coal particles and oily bubbles through wrap angle measurements, oscillatory detachment tests, and interaction force analysis. The results show that oil film thickness significantly influences both attachment and detachment dynamics. As the thickness increased from 30 μm to 160 μm, the theoretical maximum wrap angle rose from 128.8° to 205.2°, while the kinetic rate constant decreased from 0.0221 s−1 to 0.0149 s−1, indicating that thicker oil films hinder initial attachment by increasing resistance. Oscillatory detachment tests revealed that increasing the oil film thickness from 30 μm to 60 μm raised the critical detachment frequency to 20 hz. However, further increasing the thickness to 160 μm reduced it to 17.5 hz, suggesting reduced stability of the particle-bubble aggregates. Interaction force measurements showed that as the oil film thickened, electrostatic repulsion decreased from 66.9 μN to 21.5 μN, and once the thickness exceeded 60 μm, the maximum adhesion force dropped sharply. This study is the first to reveal a dual-stage regulatory mechanism through which oil film thickness influences particle-bubble interactions, providing new theoretical insights for optimizing the flotation performance of low-rank coal. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Abstract: | At present, there is a lack of systematic research on the mechanism by which oil film thickness affects the interactions between low-rank coal particles and bubbles. This study systematically examines the effect of oil film thickness on the interaction mechanisms between low-rank coal particles and oily bubbles through wrap angle measurements, oscillatory detachment tests, and interaction force analysis. The results show that oil film thickness significantly influences both attachment and detachment dynamics. As the thickness increased from 30 μm to 160 μm, the theoretical maximum wrap angle rose from 128.8° to 205.2°, while the kinetic rate constant decreased from 0.0221 s−1 to 0.0149 s−1, indicating that thicker oil films hinder initial attachment by increasing resistance. Oscillatory detachment tests revealed that increasing the oil film thickness from 30 μm to 60 μm raised the critical detachment frequency to 20 hz. However, further increasing the thickness to 160 μm reduced it to 17.5 hz, suggesting reduced stability of the particle-bubble aggregates. Interaction force measurements showed that as the oil film thickened, electrostatic repulsion decreased from 66.9 μN to 21.5 μN, and once the thickness exceeded 60 μm, the maximum adhesion force dropped sharply. This study is the first to reveal a dual-stage regulatory mechanism through which oil film thickness influences particle-bubble interactions, providing new theoretical insights for optimizing the flotation performance of low-rank coal. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 19392699 |
| DOI: | 10.1080/19392699.2025.2515513 |
