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Minerals
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Froth Characterisation and Behaviour in Mineral Processing
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Froth Characterisation and Behaviour in Mineral Processing

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 July 2021) | Viewed by 9158

Special Issue Editors

Dr. Belinda Mcfadzean

E-Mail Website
Guest Editor
Centre for Minerals Research, Department of Chemical Engineering, University of Cape Town, Cape Town, South Africa
Interests: froth characterisation and behaviour; reagent interfacial interactions; flotation hydrodynamics and plant optimisation
Dr. Kathryn Hadler

E-Mail Website
Guest Editor
Department of Earth Science and Engineering, Imperial College London, London SW7 2AZ, UK
Interests: froth flotation; electrostatic separation; dry mineral processing; space resources
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The froth zone is of great importance in the flotation process since it is the final gatekeeper determining the grade and recovery produced by the flotation cell. The froth is sensitive to an overwhelming variety of interrelated factors. These can be broadly grouped as particle properties (size, mineralogy, shape), reagent type and addition rate, and cell operating conditions (air rate, froth depth).  Characterisation of the froth is notoriously difficult, and many flotation models that have found practical application do not attempt to decouple the kinetics of the froth zone from that of the pulp. Those that do often use a fitted froth recovery factor since it is very difficult to measure froth recovery at an industrial scale. Prediction, control, and optimisation of froth properties to enhance separation performance remains challenging.

This Special Issue is dedicated to all aspects of the froth in flotation processes, including but not limited to the effects of various factors on froth response, froth characterisation methods, and froth modelling.

Dr. Belinda Mcfadzean
Dr. Kathryn Hadler
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

  • froth characterisation
  • froth modelling
  • froth stability
  • froth recovery
  • froth structure

Published Papers (2 papers)

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Research

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14 pages, 6360 KiB  
Article
Monitoring of Flotation Systems by Use of Multivariate Froth Image Analysis
by Chris Aldrich and Xiu Liu
Minerals 2021, 11(7), 683; https://doi.org/10.3390/min11070683 - 25 Jun 2021
Cited by 8 | Viewed by 3017
Abstract
Froth image analysis has been considered widely in the identification of operational regimes in flotation circuits, the characterisation of froths in terms of bubble size distributions, froth stability and local froth velocity patterns, or as a basis for the development of inferential online [...] Read more.
Froth image analysis has been considered widely in the identification of operational regimes in flotation circuits, the characterisation of froths in terms of bubble size distributions, froth stability and local froth velocity patterns, or as a basis for the development of inferential online sensors for chemical species in the froth. Relatively few studies have considered flotation froth image analysis in unsupervised process monitoring applications. In this study, it is shown that froth image analysis can be combined with traditional multivariate statistical process monitoring methods for reliable monitoring of industrial platinum metal group flotation plants. This can be accomplished with well-established methods of multivariate image analysis, such as the Haralick feature set derived from grey level co-occurrence matrices and local binary patterns that were considered in this investigation. Full article
(This article belongs to the Special Issue Froth Characterisation and Behaviour in Mineral Processing)
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Review

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29 pages, 8001 KiB  
Review
A Review of Flotation Physical Froth Flow Modifiers
by Tawona M. Jera and Clayton Bhondayi
Minerals 2021, 11(8), 864; https://doi.org/10.3390/min11080864 - 10 Aug 2021
Cited by 4 | Viewed by 5616
Abstract
Over the past few decades, the need to process more minerals while lowering capital costs has led to an increase in the size of flotation cells, e.g., 0.03 m3 to 1000 m3. However, this increase has created new challenges in [...] Read more.
Over the past few decades, the need to process more minerals while lowering capital costs has led to an increase in the size of flotation cells, e.g., 0.03 m3 to 1000 m3. However, this increase has created new challenges in the operation and design of industrial flotation cells, particularly in terms of froth removal, because the distance the froth must travel increases with an increase in the flotation cell diameter. This has a negative impact on recovery. Physical froth flow modifiers can be used to improve froth removal. Their major functions are to modify and optimise the flow of the froth, improve froth drainage, reduce dead zones, and improve froth flow and removal dynamics. Therefore, physical froth flow modifiers are discussed, evaluated, and compared in this paper. The literature indicates that physical froth flow modifiers such as crowders and launders are used extensively as industrial solutions to enhance froth transport and recovery in large flotation cells. Other modifiers (including froth baffles and froth scrapers) have been found to have a profound effect on local froth phase sub-processes, including drainage and bubble coalescence. However, industrial uptake is either dwindling or limited to small-volume rectangular/U-shaped cells in the case of scrapers, or, there is no uptake at all in the case of froth baffles. Further research on how some of the physical modifiers (e.g., baffles and launders) impact the selectivity of particles is required. Full article
(This article belongs to the Special Issue Froth Characterisation and Behaviour in Mineral Processing)
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