浮選過程中顆粒-氣泡黏附作用機理及研究進展

王超; 孫春寶; 寇玨

doi:10.13374/j.issn2095-9389.2018.12.001

浮選過程中顆粒-氣泡黏附作用機理及研究進展

doi: 10.13374/j.issn2095-9389.2018.12.001

北京科技大學金屬礦山高效開采與安全教育部重點實驗室, 北京 100083

詳細信息

中圖分類號: TD923
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出版歷程
- 收稿日期: 2017-11-27

Mechanism and research progress of the bubble-particle attachment in flotation

Key Laboratory of the Ministry of Education of China for High-efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要: 系統分析總結了浮選過程中顆粒與氣泡的黏附概率模型、EDLVO理論、顆粒-氣泡集合體的受力分析、影響因素分析和顆粒-氣泡黏附的研究進展.基于接觸時間、感應時間的方法和能量勢壘的方法，分別從動力學和熱力學的角度分析總結了黏附概率模型，并從動力學和熱力學的角度解釋了顆粒大小、氣泡大小、顆粒疏水性、顆粒表面粗糙度和溶液pH對黏附概率的影響，對靜態環境和湍流環境中顆粒-氣泡集合體進行了受力分析，顆粒和氣泡的黏附力有毛細作用力、液體靜壓力和浮力，靜態環境中的脫附力只有重力，但是湍流環境中的脫附力還包括振蕩力和離心力.很多研究學者利用先進的儀器和檢測手段對顆粒-氣泡的黏附做了大量的研究，取得了大量研究成果.顆粒-氣泡黏附作用過程相當復雜，試驗研究時簡化了作用條件，目前理論不能滿意解釋黏附過程，需要結合實際進行更深層次、更全面的研究.
- 顆粒 /
- 浮選氣泡 /
- 黏附 /
- 概率模型 /
- EDLVO理論 /
- 受力分析 /
- 影響因素
Abstract: The interaction process between particles and bubbles can be classified as collision, attachment, and detachment; all three sub-processes determine the collection probability between particles and bubbles. Upon collision, the hydrophobic particles strongly attach to the rising air bubbles, which carry them to the surface, thereby overflowing the flotation cell in the collecting launder. Hydrophilic particles unattached to the rising air bubbles are left to settle at the bottom of the cell to be discharged. Whether the target mineral particles can attach to the rising air bubbles is the key to froth flotation. Therefore, studying bubble-particle attachment to improve the flotation efficiency is quite significant. The bubble-particle attachment probability model, EDLVO theory, force analysis of the bubble-particle aggregate, influence factors, and experimental progress of the bubble-particle attachment were systematically analyzed. Based on the methods of contact time, induction time, and energy barrier, the adhesion probability model was analyzed from the perspectives of dynamics and thermodynamics, and the effect of particle size, bubble size, particle hydrophobicity, particle surface roughness, and pH values on adhesion probability were explained. The force analysis of the bubble-particle aggregate under quiescent and turbulent conditions was conducted. Typically, there exist three types of attachment forces of the bubble-particle aggregate:capillary force, hydrostatic pressure force, and buoyancy force. The weight force is the only detachment force of the bubble-particle aggregate in the quiescent condition, but the vibration and centrifugal forces are also detachment forces in the turbulent condition. Many researchers have conducted substantial research on particle-bubble adhesion using advanced instruments and detection means, and have made several research achievements. However, because bubble-particle interaction is extremely complicated, the interaction conditions are simplified during experimental study. Therefore, the attachment process is not satisfactorily described by the available theory. Combined with practical application demands, a bubble-particle study should be conducted from a deeper and more comprehensive level.
- particle /
- flotation bubble /
- attachment /
- probability model /
- EDLVO /
- force analysis /
- influence factors

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