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Minerals
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Iron Ore Flotation
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Iron Ore 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 (12 May 2021) | Viewed by 5704

Special Issue Editors

Prof. Dr. Marisa Bezerra De Mello Monte

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Guest Editor
Laboratory for Surface Chemistry, Centre for Mineral Technology, Ministry of Science, Technology, Innovation and Communication (MCTIC), Av. Pedro Calmon, 900–Campus of Federal University of Rio de Janeiro, Rio de Janeiro 21941-908, Brazil
Interests: physical chemistry; flotation; surface chemistry; nanoscience; nanotechnology; chemistry; mineral processing and advanced characterization of ores
Dr. Iranildes Daniel dos Santos

E-Mail Website
Guest Editor
Instituto Tecnologico Vale–ITV BR 381, KM 450-Distrito Industrial Simão da Cunha, Santa Luzia, Minas Gerais 33040-900, Brazil
Interests: physical chemistry; surface chemistry; mineral processing; advanced characterization of ores; flotation; hydormetallurgy and electrochemistry

Special Issue Information

Dear Colleagues,

Iron ore flotation is a key technique to concentrate intermediate-low-grade ore, in order to reach the market requirements for higher-grade concentrates of iron. The presence of some impurities in addition to quartz in iron ore, aluminium silicates, and minerals containing phosphorus impair productivity in the steel industry and have an impact on iron ore concentrate value. The flotation method most commonly applied is the one that is based on cationic flotation of silica and silicates (reverse flotation), and which is preceded by desliming. As the complexity of mineralogy grows, in terms of extremely fine mineral liberation and very complex intergrowths, a number of signifcant issues come into view. Thus, there is a crucial need for research designed to make the iron ore mining industry more sustainable. This Special Issue will focus on recent advances in iron ore flotation, including but not limited to topics such as fundamental reagent, flotation chemistry, bubbles, froths, bubble–particle interactions, flotation applications, and plant practice.

Prof. Dr. Marisa Bezerra De Mello Monte
Dr. Iranildes Daniel dos Santos
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

  • iron ore flotation
  • slime coating
  • mechanism of the reagents–hematite surface
  • iron ore flotation reagent system
  • iron ore slime flotation

Published Papers (2 papers)

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Research

11 pages, 3499 KiB  
Article
Process Evaluation of an Iron Ore Operation Using the Floatability Component Model
by Stefan Geldenhuys, Thiago Souza Pinto, Laurindo Leal Filho and David Deglon
Minerals 2021, 11(6), 589; https://doi.org/10.3390/min11060589 - 31 May 2021
Cited by 3 | Viewed by 2438
Abstract
The Brucutu iron ore mine (Minas Gerais, Brazil) is Vale‘s largest iron producing operation achieving around 21 million tons per annum. Evaluation of flotation performance is of high importance as even small gains can lead to large monetary benefits. Cell-by-cell samples of the [...] Read more.
The Brucutu iron ore mine (Minas Gerais, Brazil) is Vale‘s largest iron producing operation achieving around 21 million tons per annum. Evaluation of flotation performance is of high importance as even small gains can lead to large monetary benefits. Cell-by-cell samples of the froth products, selected feed and pulp-products were analyzed for flow rate, particle size distribution and chemical composition. In addition, certain samples were analyzed on an assay-by-size basis and hydrodynamic measurements of certain flotation cells were also performed. This detailed experimental dataset was then used to calibrate a floatability component model of the process. Longer mainline residence time resulted in significant Fe2O3 losses while yielding little benefit in terms of SiO2 product grade. Scavenger 2 has twice the residence time of scavenger 1 while having to treat only 10% of the SiO2, resulting in high Fe2O3 recoveries to the froth and poor separation. In addition, it is shown that the Fe2O3 exhibits true flotation behavior resulting in increased Fe2O3 losses. Simulations using the floatability component model identified avenues of process improvement to address the identified behavior. The insight provided by the simulations into the dynamics of the flotation process is invaluable for process engineers. Full article
(This article belongs to the Special Issue Iron Ore Flotation)
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13 pages, 4738 KiB  
Article
On the Recovery of Hematite from an Iron Ore Fine Fraction by Electroflotation Using a Biosurfactant
by Carolina R. Simões, Ronald R. Hacha, Antonio G. Merma and Maurício L. Torem
Minerals 2020, 10(12), 1057; https://doi.org/10.3390/min10121057 - 26 Nov 2020
Cited by 8 | Viewed by 2162
Abstract
Electroflotation is a clean technique potentially able to recover fine particles from mineral suspensions. The aim of the present work was to evaluate the electroflotation of fines and ultrafine particles of an itabiritic iron ore using a biosurfactant extracted from Rhodococcus opacus bacteria. [...] Read more.
Electroflotation is a clean technique potentially able to recover fine particles from mineral suspensions. The aim of the present work was to evaluate the electroflotation of fines and ultrafine particles of an itabiritic iron ore using a biosurfactant extracted from Rhodococcus opacus bacteria. Infrared spectroscopy and zeta potential measurements confirmed the interaction between the biosurfactant and the mineral surface. The isoelectric point of hematite presented a value of about pH 5.3; after interacting with the biosurfactant, a charge reversal point of pH 3.5 was observed. The biosurfactant reduced the air/water surface tension from 71 to 40 mN/m, using 25 mg/L concentration. The electroflotation process of fine and ultrafine particles was evaluated as a function of pH, biosurfactant concentration, stirring of the aqueous suspension and current density. It was observed that the iron recovery (%) and iron grade (%) were negatively affected by increasing pH value. Therefore, best results were achieved at pH 3. Biosurfactant concentration and current density positively affected both response variables. An iron recovery value of about 83% and an iron grade of about 59% were achieved for the −38 + 20 µm size fraction; whereas, higher values were attained (98% and 64%, respectively) for the finer size fraction −20 µm. Full article
(This article belongs to the Special Issue Iron Ore Flotation)
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