疏水界面纳米气泡特性及其对矿物浮选行为影响研究

李臣威; 李丹龙; 李鑫; 徐明; 张海军

doi:10.1007/s12613-021-2279-1

Volume 29 Issue 8

Aug. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(8): 1493-1501

Chenwei Li, Danlong Li, Xin Li, Ming Xu, and Haijun Zhang, Surface nanobubbles on the hydrophobic surface and their implication to flotation, Int. J. Miner. Metall. Mater., 29(2022), No. 8, pp. 1493-1501. https://doi.org/10.1007/s12613-021-2279-1

Cite this article as:

Chenwei Li, Danlong Li, Xin Li, Ming Xu, and Haijun Zhang, Surface nanobubbles on the hydrophobic surface and their implication to flotation, Int. J. Miner. Metall. Mater., 29(2022), No. 8, pp. 1493-1501. https://doi.org/10.1007/s12613-021-2279-1

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研究论文

疏水界面纳米气泡特性及其对矿物浮选行为影响研究

1)
中国矿业大学化工学院，徐州 221116，中国
2)
中国矿业大学国家煤加工与洁净化工程技术研究中心，徐州 221116，中国
3)
Helmholtz Institute Freiberg for Resource Technology, Helmholtz-Zentrum Dresden-Rossendorf, Chemnitzer Straße 40, 09599 Freiberg, Germany

通讯作者:
张海军 E-mail: zhjcumt@163.com

文章亮点

(1) 结合原子力显微镜接触模式和轻敲模式对纳米颗粒存在状态进行了识别。

(2) 发现了常温水中纳米气泡在固液界面的成核现象。

(3) 研究了纳米气泡对外界物理化学环境变化的应答。

中文摘要

纳米气泡在细粒浮选中具有巨大的应用潜力。本文利用原子力显微镜研究了纳米颗粒的身份识别、测量参数对纳米气泡形貌的影响以及纳米气泡对pH、盐浓度和表面活性剂浓度变化等外部刺激的应答。实验发现纳米气泡可在室温环境中的固液界面成核，接触模式下针尖驱动的纳米结构间的兼并现象为纳米结构的气相本质提供了实验的证据。盐及MIBC浓度的变化对纳米气泡的横跨尺寸和高度无显著的影响，LiCl的添加对纳米气泡的横跨尺寸分布影响不大，但是显著影响了纳米气泡的高度分布。本文研究结果可为基于纳米气泡强化的矿物浮选过程设计提供参考。

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Research Article

Surface nanobubbles on the hydrophobic surface and their implication to flotation

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Abstract

Abstract

Nanobubbles play a potential role in the application of the flotation of fine particles. In this work, the identification of nanoentities was performed with a contact mode atomic force microscope (AFM). Moreover, the influences of setpoint ratio and amplitude of the cantilever and the responses of the formed surface nanobubbles to the fluctuation of pH, salt concentration, and surfactant concentration in the slurry were respectively studied. Nanobubbles were reported on the highly oriented pyrolytic graphite (HOPG) surface as the HOPG was immersed in deionized water under ambient temperature. The coalescence of nanobubbles occurred under contact mode, which provides strong evidence of the gaseous nature of these nanostructures on HOPG. The measuring height of the surface nanobubbles decreased with the setpoint ratio. The changes in the pH and concentration of methyl isobutyl carbinol (MIBC) show a negligible influence on the lateral size and height of the preexisting surface nanobubbles. The addition of LiCl results in a negligible change of the lateral size; however, an obvious change is noticed in the height of surface nanobubbles. The results are expected to provide a valuable reference in understanding the properties of surface nanobubbles and in the design of nanobubble-assisted flotation processes.
- surface nanobubbles;
- flotation;
- pH;
- salt concentration;
- surfactant concentration

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