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Minerals
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Advances on Fine Particles and Bubbles Flotation, 2nd Edition
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Advances on Fine Particles and Bubbles Flotation, 2nd Edition

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Processing and Extractive Metallurgy".

Deadline for manuscript submissions: 15 June 2025 | Viewed by 2901

Special Issue Editors

Prof. Dr. Liuyi Ren

E-Mail Website
Guest Editor
School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
Interests: microbubble flotation; particle-bubble interaction; interface; fine particle
Special Issues, Collections and Topics in MDPI journals
Dr. Siyuan Yang

E-Mail Website
Guest Editor
School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
Interests: nanobubble; particle-bubble interaction; coal flotation; Interface
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The froth flotation process separates solid particles based on the differences in physical and surface chemistry properties. It is most efficient and cost effective for particles within a narrow size range, nominally from 10 to 100 µm for the minerals. The flotation of fine particles (−10 µm) has become particularly important in recent years as advances have been made in grinding, which allow low grade mineral deposits to be economically exploited. The poor recovery of fines by flotation can be attributed to the low probability of bubble-particle collision, which decreases with the decrease of particle size, and high probability of detachment, respectively. Particle collection by air bubbles is regarded as the heart of froth flotation operation. Then, nanobubbles, which refer to tiny bubbles mostly finer than a few hundred nanometers, can extend the lower particle size limits for effective flotation of coal, phosphate, iron ore, some typical oxidized minerals, etc. Its introduction is one effective way to solve the problem of fine particle flotation.

The Special Issue of “Advances on Fine Particles and Bubbles Flotation” welcomes studies including: fine particle flotation, microbubble flotation, nanobubble flotation, particle-bubble interaction, collision and adhesion between particle and bubble, particle–bubble interface science, the aggregation of fine particle and bubble, and the dynamic study of fine particle and bubble flotation systems. We welcome contributions from all practitioners of this scientific topic.

Prof. Dr. Liuyi Ren
Dr. Siyuan Yang
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Minerals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • fine particle flotation
  • microbubble flotation
  • bubble-particle flotation
  • bubble formation
  • bubble property
  • bubble modification
  • flocculation
  • agglomeration
  • interface

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Related Special Issue

Published Papers (2 papers)

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Research

18 pages, 5588 KiB  
Article
Study on the Dynamic Process of the Attachment of a Single Bubble to Rough Surfaces with Different Hydrophobicity
by Songjiang Chen, Jiarui Wang, Gang Lei, Wanqi Ma, Ningning Zhang, Yuexian Yu, Zhanglei Zhu and Zhen Li
Minerals 2024, 14(10), 963; https://doi.org/10.3390/min14100963 - 24 Sep 2024
Viewed by 960
Abstract
A stable attachment between bubbles and solid particles is essential for flotation. Therefore, it is particularly necessary to study the dynamic process that occur in the attachment of bubbles to a solid surface. In this paper, Teflon and plexiglass plates were used as [...] Read more.
A stable attachment between bubbles and solid particles is essential for flotation. Therefore, it is particularly necessary to study the dynamic process that occur in the attachment of bubbles to a solid surface. In this paper, Teflon and plexiglass plates were used as hydrophobic and hydrophilic solid surfaces, respectively, and solid surfaces with roughness of 0.018 μm to 5.33 μm were prepared by polishing with sandpaper. The influence of roughness on the dynamic process in bubble attachment to solid surfaces with different hydrophobicity was studied via a high-speed camera (750 frames per second). It was found that roughness played a positive role in the attachment to the hydrophobic Teflon surface while a negative role in the attachment to the hydrophilic plexiglass surface in terms of the bubble’s attachment to the solid plates. For a smooth Teflon surface, the formation of three–phase contact (i.e., the drainage of wetting film) took up to 95 ms, whereas for a very rough Teflon surface it took only 5 milliseconds. On the contrary, the high roughness prevented the bubble from attaching to the hydrophilic plexiglass surface. It was concluded that the increased roughness of Teflon plates was conductive to air entrapment in surface irregularities, inducing the rapid rupture of the wetting film on a very rough Teflon surface, while the increased roughness of the plexiglass plates resulted in “water pockets” in surface grooves, making the wetting film on the plexiglass surface stable. Full article
(This article belongs to the Special Issue Advances on Fine Particles and Bubbles Flotation, 2nd Edition)
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16 pages, 2804 KiB  
Article
Insight into the Effect of Nanobubbles on Fine Muscovite Powder Flotation in Different Dodecylamine Concentrations and Stirring Intensities: Kinetics and Mechanism
by Xinyu Zhang, Liuyi Ren, Shenxu Bao, Yimin Zhang, Guohao Chen and Bo Chen
Minerals 2024, 14(7), 694; https://doi.org/10.3390/min14070694 - 3 Jul 2024
Cited by 5 | Viewed by 1497
Abstract
Flotation-introduced nanobubbles were expected to be an efficient and economical method to recover fine muscovite. This study aimed to explore the mechanism of the change appearing in flotation after introducing nanobubbles through micro-flotation, particle vision and measurement, flotation kinetics, and induction time measurement. [...] Read more.
Flotation-introduced nanobubbles were expected to be an efficient and economical method to recover fine muscovite. This study aimed to explore the mechanism of the change appearing in flotation after introducing nanobubbles through micro-flotation, particle vision and measurement, flotation kinetics, and induction time measurement. The results of micro-flotation, which respectively feed muscovite or muscovite pretreated with nanobubbles in different concentrations of dodecylamine (DDA), were fitted with four flotation kinetic models using Origin. Different methods were used to examine how the introduction of nanobubbles affected the flotation process. The results showed that nanobubbles improved both the flotation rate and recovery of muscovite. Nanobubbles played different roles in different stirring intensities. At low stirring intensity, nanobubbles did not perform well. In suitable stirring intensity, nanobubbles helped particles aggregate and improved the collision probability between bubbles and minerals. However, at high stirring intensity, shear forces caused by ultra-high fluid velocities could disrupt particle aggregation. Full article
(This article belongs to the Special Issue Advances on Fine Particles and Bubbles Flotation, 2nd Edition)
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