Latest advances and progress in the microbubble flotation of fine minerals: Microbubble preparation, equipment, and applications

Ziyong Chang; Sensen Niu; Zhengchang Shen; Laichang Zou; Huajun Wang

doi:10.1007/s12613-023-2615-8

Volume 30 Issue 7

Jul. 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(7): 1244-1260

Ziyong Chang, Sensen Niu, Zhengchang Shen, Laichang Zou, and Huajun Wang, Latest advances and progress in the microbubble flotation of fine minerals: Microbubble preparation, equipment, and applications, Int. J. Miner. Metall. Mater., 30(2023), No. 7, pp. 1244-1260. https://doi.org/10.1007/s12613-023-2615-8

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Ziyong Chang, Sensen Niu, Zhengchang Shen, Laichang Zou, and Huajun Wang, Latest advances and progress in the microbubble flotation of fine minerals: Microbubble preparation, equipment, and applications, Int. J. Miner. Metall. Mater., 30(2023), No. 7, pp. 1244-1260. https://doi.org/10.1007/s12613-023-2615-8

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Invited Review

Latest advances and progress in the microbubble flotation of fine minerals: Microbubble preparation, equipment, and applications

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Corresponding author:
Ziyong Chang E-mail: changziyong@ustb.edu.cn
Received: 12 November 2022; Revised: 16 February 2023; Accepted: 17 February 2023; Available online: 18 February 2023

Abstract

Abstract

In the past few decades, microbubble flotation has been widely studied in the separation and beneficiation of fine minerals. Compared with conventional flotation, microbubble flotation has obvious advantages, such as high grade and recovery and low consumption of flotation reagents. This work systematically reviews the latest advances and research progress in the flotation of fine mineral particles by microbubbles. In general, microbubbles have small bubble size, large specific surface area, high surface energy, and good selectivity and can also easily be attached to the surface of hydrophobic particles or large bubbles, greatly reducing the detaching probability of particles from bubbles. Microbubbles can be prepared by pressurized aeration and dissolved air, electrolysis, ultrasonic cavitation, photocatalysis, solvent exchange, temperature difference method (TDM), and Venturi tube and membrane method. Correspondingly, equipment for fine-particle flotation is categorized as microbubble release flotation machine, centrifugal flotation column, packed flotation column, and magnetic flotation machine. In practice, microbubble flotation has been widely studied in the beneficiation of ultrafine coals, metallic minerals, and nonmetallic minerals and exhibited superiority over conventional flotation machines. Mechanisms underpinning the promotion of fine-particle flotation by nanobubbles include the agglomeration of fine particles, high stability of nanobubbles in aqueous solutions, and enhancement of particle hydrophobicity and flotation dynamics.
- microbubble preparation;
- flotation;
- fine minerals;
- flotation equipment;
- bubble–particle interaction

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