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Minerals
Special Issues
Bubble Attachment and Mineral Flotation
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Bubble Attachment and Mineral Flotation

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

Deadline for manuscript submissions: closed (31 October 2020) | Viewed by 6935

Special Issue Editor

Prof. Dr. Jan Zawała

E-Mail Website
Guest Editor
Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Krakow, Poland
Interests: soft matter; colloids; fluid/fluid interfaces; separation; adsorption; surfactants; bubble/droplet hydrodynamics; liquid films
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We aim to publish a Special Issue of the Journal entitled “Bubble Attachment and Mineral Flotation”. Regarding the scientific scope of the journal, the topics of interest of this Special Issue should include original papers related to basic and application research on physicochemical aspects of the flotation separation process, such as

  • Experimental and theoretical studies on the stability of liquid films (foam and wetting) under static and dynamic conditions;
  • The kinetics of bubble–solid surface attachment (minerals and plastics);
  • Solid surface wettability;
  • Surfactant adsorption;
  • The hydrodynamics of bubble in surfactant solution.

Thank you and we look forward to receiving your valuable contributions.

Prof. Jan Zawała
Guest Editor

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

  • bubble
  • flotation
  • mineral particle
  • collision
  • aggregate
  • detachment
  • surfactant
  • interface
  • wettability

Published Papers (2 papers)

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Research

17 pages, 3940 KiB  
Article
Effect of Bubble Surface Properties on Bubble–Particle Collision Efficiency in Froth Flotation
by Shuofu Li, Kou Jue and Chunbao Sun
Minerals 2020, 10(4), 367; https://doi.org/10.3390/min10040367 - 19 Apr 2020
Cited by 7 | Viewed by 3521
Abstract
In research on the particle–bubble collision process, due to the adsorption of surfactants and impurities (such as mineral particles, slime, etc.), most studies consider the bubble surface environment to be immobile. However, in the real situation of froth flotation, the nature of the [...] Read more.
In research on the particle–bubble collision process, due to the adsorption of surfactants and impurities (such as mineral particles, slime, etc.), most studies consider the bubble surface environment to be immobile. However, in the real situation of froth flotation, the nature of the bubble surface (degree of slip) is unknown. Mobile surface bubbles increase the critical thickness of the hydration film rupture between particles and bubbles, and enhance the collision between particles and bubbles. Sam (1996) showed that when the diameter of the bubble is large enough, a part of the surface of the bubble can be transformed into a mobile state. When the bubble rises in a surfactant solution, the surface pollutants are swept to the end of the bubble, so when the bubble reaches terminal velocity, the upper surface of the bubble is changed into a mobile surface. This paper analyzes the collision efficiency and fluid flow pattern of bubbles with mobile and immobile surfaces, and expounds the influence of surface properties on collision efficiency. Full article
(This article belongs to the Special Issue Bubble Attachment and Mineral Flotation)
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13 pages, 7566 KiB  
Article
Effect of Hydrodynamic Cavitation Assistance on Different Stages of Coal Flotation
by Hua Han, An Liu and Huaifa Wang
Minerals 2020, 10(3), 221; https://doi.org/10.3390/min10030221 - 29 Feb 2020
Cited by 11 | Viewed by 3039
Abstract
In this study, the effect of hydrodynamic cavitation (HC) on the conditioning stage (HCCS), separation stage (HCSS), and whole stage (HCWS) of coal flotation was investigated by flotation tests, laser granulometry, and contact angle measurements. The flotation results indicate that compared to conventional [...] Read more.
In this study, the effect of hydrodynamic cavitation (HC) on the conditioning stage (HCCS), separation stage (HCSS), and whole stage (HCWS) of coal flotation was investigated by flotation tests, laser granulometry, and contact angle measurements. The flotation results indicate that compared to conventional flotation, all HC-assisted flotation methods can improve concentrate combustible recovery and flotation constant rate. HCCS and HCSS show similar levels of improvement, while HCWS has a better flotation efficiency. The screening tests demonstrate that HC has the advantage of being able to liberate coarse coal particles (+0.25 mm) prior to being combined with gangues. On one hand, HC promotes the dispersion of both particles and agents, while longer cavitation time in HCCS does not lead to better flotation performance. On the other hand, enhancement of the adsorption of the collector on the surface of coal particles in HCCS is confirmed by flotation concentrate contact angle tests. However, HCSS leads to a decrease in concentrate hydrophobicity, compared to conventional flotation. The micro-nanobubbles generated by HC play an important role in improving flotation performance. HCWS offers the advantages of both HCCS and HCSS, and the cooperated mechanism of different HC modes enhances the recovery of coal particles in flotation. Full article
(This article belongs to the Special Issue Bubble Attachment and Mineral Flotation)
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