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The Influence of Specific Ions and Oxyhydroxo Species in Plant Water on the Bubble–Particle Attachment of Pyrrhotite

[Image: see text] Previous studies have considered the effect of using recycled process water in froth flotation and whether certain ions are responsible for what is observed in the final concentrate in terms of mineral grades and recoveries. The attachment of mineral particles to air bubbles is a f...

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Autores principales: October, Lisa Louise, Manono, Malibongwe Shadrach, Corin, Kirsten Claire, Schreithofer, Nora, Wiese, Jenny Gael
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8567266/
https://www.ncbi.nlm.nih.gov/pubmed/34746545
http://dx.doi.org/10.1021/acsomega.1c01152
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author October, Lisa Louise
Manono, Malibongwe Shadrach
Corin, Kirsten Claire
Schreithofer, Nora
Wiese, Jenny Gael
author_facet October, Lisa Louise
Manono, Malibongwe Shadrach
Corin, Kirsten Claire
Schreithofer, Nora
Wiese, Jenny Gael
author_sort October, Lisa Louise
collection PubMed
description [Image: see text] Previous studies have considered the effect of using recycled process water in froth flotation and whether certain ions are responsible for what is observed in the final concentrate in terms of mineral grades and recoveries. The attachment of mineral particles to air bubbles is a fundamental subprocess of flotation, without which separation of valuable minerals from nonvaluables cannot occur; it is, therefore, of interest to assess the effect of specific ionic species on bubble–particle attachment. The effects of oxyhydroxo species on bubble−particle interactions were studied with three synthetic plant water (SPWs) of increasing ionic strengths at pH 11 as it is known to through solution speciation that at this pH, oxyhydroxo species may be present in significant concentrations. The presence of these oxyhydroxo species such as magnesium and calcium hydroxides in alkaline pulps were confirmed by many researchers and proven to affect bubble and particle surface charges. Furthermore, to ascertain whether there were certain ions within the plant water that impacted the bubble–particle attachment more significantly than others, tests were carried out with carefully selected single salt solutions. The SPWs at pH 11 resulted in very poor pyrrhotite attachment probabilities and recoveries as compared to the attachment probabilities and recoveries that were obtained with these waters at pH 6.5. Increasing the ionic strength of SPWs resulted in a decrease in pyrrhotite attachment probabilities more evidently at pH 11. Thus, it can be concluded that the presence of CaOH(+), (MgOH)(2), and MgOH(+) species hinders the flotation of pyrrhotite particles. Studies on selected single salts showed that Na(+) resulted in better pyrrhotite attachment probability and recovery compared to Ca(2+). Furthermore, upon studying the anion effect, SO(4)(2–) performed better than NO(3)(–) when paired with Ca(2+), thus indicating a negative effect on flotation response when Ca(2+) and NO(3)(–) ions are used together. These results can be attributed to the action of species such as Ca(2+), CaNO(3)(+), and CaSO(4)(aq.) on the zeta potential and their consequential effect on the electrical double layer. The outcomes of this work should be of significant importance for an effective management of ions in recycled process water in the froth flotation process.
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spelling pubmed-85672662021-11-05 The Influence of Specific Ions and Oxyhydroxo Species in Plant Water on the Bubble–Particle Attachment of Pyrrhotite October, Lisa Louise Manono, Malibongwe Shadrach Corin, Kirsten Claire Schreithofer, Nora Wiese, Jenny Gael ACS Omega [Image: see text] Previous studies have considered the effect of using recycled process water in froth flotation and whether certain ions are responsible for what is observed in the final concentrate in terms of mineral grades and recoveries. The attachment of mineral particles to air bubbles is a fundamental subprocess of flotation, without which separation of valuable minerals from nonvaluables cannot occur; it is, therefore, of interest to assess the effect of specific ionic species on bubble–particle attachment. The effects of oxyhydroxo species on bubble−particle interactions were studied with three synthetic plant water (SPWs) of increasing ionic strengths at pH 11 as it is known to through solution speciation that at this pH, oxyhydroxo species may be present in significant concentrations. The presence of these oxyhydroxo species such as magnesium and calcium hydroxides in alkaline pulps were confirmed by many researchers and proven to affect bubble and particle surface charges. Furthermore, to ascertain whether there were certain ions within the plant water that impacted the bubble–particle attachment more significantly than others, tests were carried out with carefully selected single salt solutions. The SPWs at pH 11 resulted in very poor pyrrhotite attachment probabilities and recoveries as compared to the attachment probabilities and recoveries that were obtained with these waters at pH 6.5. Increasing the ionic strength of SPWs resulted in a decrease in pyrrhotite attachment probabilities more evidently at pH 11. Thus, it can be concluded that the presence of CaOH(+), (MgOH)(2), and MgOH(+) species hinders the flotation of pyrrhotite particles. Studies on selected single salts showed that Na(+) resulted in better pyrrhotite attachment probability and recovery compared to Ca(2+). Furthermore, upon studying the anion effect, SO(4)(2–) performed better than NO(3)(–) when paired with Ca(2+), thus indicating a negative effect on flotation response when Ca(2+) and NO(3)(–) ions are used together. These results can be attributed to the action of species such as Ca(2+), CaNO(3)(+), and CaSO(4)(aq.) on the zeta potential and their consequential effect on the electrical double layer. The outcomes of this work should be of significant importance for an effective management of ions in recycled process water in the froth flotation process. American Chemical Society 2021-10-18 /pmc/articles/PMC8567266/ /pubmed/34746545 http://dx.doi.org/10.1021/acsomega.1c01152 Text en © 2021 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle October, Lisa Louise
Manono, Malibongwe Shadrach
Corin, Kirsten Claire
Schreithofer, Nora
Wiese, Jenny Gael
The Influence of Specific Ions and Oxyhydroxo Species in Plant Water on the Bubble–Particle Attachment of Pyrrhotite
title The Influence of Specific Ions and Oxyhydroxo Species in Plant Water on the Bubble–Particle Attachment of Pyrrhotite
title_full The Influence of Specific Ions and Oxyhydroxo Species in Plant Water on the Bubble–Particle Attachment of Pyrrhotite
title_fullStr The Influence of Specific Ions and Oxyhydroxo Species in Plant Water on the Bubble–Particle Attachment of Pyrrhotite
title_full_unstemmed The Influence of Specific Ions and Oxyhydroxo Species in Plant Water on the Bubble–Particle Attachment of Pyrrhotite
title_short The Influence of Specific Ions and Oxyhydroxo Species in Plant Water on the Bubble–Particle Attachment of Pyrrhotite
title_sort influence of specific ions and oxyhydroxo species in plant water on the bubble–particle attachment of pyrrhotite
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8567266/
https://www.ncbi.nlm.nih.gov/pubmed/34746545
http://dx.doi.org/10.1021/acsomega.1c01152
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