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Sampling from large flotation cells: An invastigation of spatial distribution
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering. New Boliden AB.
2019 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The general trend in flotation technology today is towards larger flotation cells, which enables a higher throughput. However, adverse effects such as segregation and reduced froth transport efficiency have also been observed in larger cells. To better understand these problems it is of relevance to understand how the minerals of interest are moving and distributed inside flotation cells.

A sampling investigation of industrial scale tank cells has been carried out. The samples have been analyzed by their physical properties, such as grade, solid concentration, particle size distribution and mineral composition. A novel method of measuring the wettability has been validated against traditional techniques for characterizing the surface properties of mineral samples. Different techniques and devices for sampling has also been evaluated.

The results showed segregation inside the cells, with the quiescent zone having lower particle size (P80) and lower weight % solid. The grade profile in the vertical direction was relatively constant even though the P80 and weight % solid decreased in the quiescent zone.

The smaller particles in the quiescent zone contained higher fraction of soft clay particles, which also correlated with a higher degree of hydrophilicity.

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2019. , p. 86
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Keywords [en]
Flotation, sampling
National Category
Mineral and Mine Engineering Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-72794ISBN: 978-91-7790-314-7 (print)ISBN: 978-91-7790-315-4 (electronic)OAI: oai:DiVA.org:ltu-72794DiVA, id: diva2:1287186
Presentation
2019-04-05, F531, Luleå tekniska universitet, Luleå, 10:00 (English)
Opponent
Supervisors
Funder
VinnovaVinnovaAvailable from: 2019-02-11 Created: 2019-02-08 Last updated: 2019-03-19Bibliographically approved
List of papers
1. Application of Dynamic Vapor Sorption for evaluation of hydrophobicity in industrial-scale froth flotation
Open this publication in new window or tab >>Application of Dynamic Vapor Sorption for evaluation of hydrophobicity in industrial-scale froth flotation
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2018 (English)In: Minerals Engineering, ISSN 0892-6875, E-ISSN 1872-9444, Vol. 127, p. 305-311Article in journal (Refereed) Published
Abstract [en]

The particle surface properties are essential for understanding froth flotation, particularly for the evaluation of various chemical or reagent effects.

Dynamic Vapor Sorption (DVS) is used in the pharmaceutical industry for the evaluation of surface properties and has to the knowledge of the authors not been used for applications in mineral processing. This paper describes an evaluation of industrial ore samples using DVS.

Four samples (feed, CuPb concentrate, Cu concentrate and Pb concentrate) from each of the Cu – Pb flotation processes in the Boliden and Garpenberg concentrators, Sweden, were analyzed by DVS in order to investigate if this technique could be used to estimate differences in their hydrophilicity. The DVS measures the water uptake as a function of the relative humidity (%RH) at constant temperature.

For both series of four samples, it was found that the DVS-data are in precise agreement with the flotation theory on hydrophobicity (indicated by differences in water uptake). The feed material, without any collectors, adsorbed more water compared to the CuPb bulk concentrate, which in turn adsorbed more water than the Cu concentrate. The lead concentrate on the other hand, which had been depressed by dichromate and should be more hydrophilic, showed a higher adsorbance of water than that of the CuPb concentrate.

The repeated measurements of three sub samples from one of the ore samples gave a mean value and an estimated standard deviation of 0.13 ± 0.01%. This shows that the method gives highly reproducible results and that the differences between the samples had high significance. This also shows that the DVS method can serve as a useful complement to traditionally used contact angle or capillary absorption-based measurement methods, especially when screening for new flotation reagents on industrial ore samples.

Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-66720 (URN)10.1016/j.mineng.2017.11.004 (DOI)000445308600035 ()
Note

Validerad;2018;Nivå 2;2018-08-30 (andbra)

Available from: 2017-11-23 Created: 2017-11-23 Last updated: 2019-02-08Bibliographically approved
2. Spatial Variations of Pulp Properties in Flotation: Implications for Optimizing Cell Design and Performance
Open this publication in new window or tab >>Spatial Variations of Pulp Properties in Flotation: Implications for Optimizing Cell Design and Performance
2016 (English)In: Proceedings of International Mineral Processing Congress, Quebec, Canada, ISBN, 2016Conference paper, Published paper (Refereed)
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
urn:nbn:se:ltu:diva-60109 (URN)978-1-926872-29-2 (ISBN)
Conference
XXVIII International Mineral Processing Congress, Québec City, September 11-15 2016
Available from: 2016-11-02 Created: 2016-11-02 Last updated: 2019-02-08Bibliographically approved
3. Untersuchung des Einflusses der Zellengeometrie auf den Flotationsprozess
Open this publication in new window or tab >>Untersuchung des Einflusses der Zellengeometrie auf den Flotationsprozess
2017 (German)In: Berg- und Huttenmännische Monatshefte (BHM), ISSN 0005-8912, E-ISSN 1613-7531, Vol. 162, no 8, p. 281-288Article in journal (Refereed) Published
Abstract [de]

Der Trend in der Entwicklung der Flotationstechnologie geht weiterhin in Richtung sehr großer Zellen. Ein Scale-up von Flotationszellen wird zumeist unter Beibehaltung ähnlicher geometrischer Proportionen vorgenommen, d. h. das Verhältnis von Durchmesser zu Höhe wird bei Vergrößerung des Volumens häufig konstant gehalten. Zudem werden bei dem Entwurf von Flotationsanlagen zumeist mehrere Zellen mit identischer Geometrie innerhalb einer Flotationsbank verwendet. Die Verwendung weniger Standardgrößen in einer Flotationsanlage vereinfacht einerseits Entwurf, Herstellung und Wartung der Flotationsapparate. Andererseits werden hierdurch Leistungsfähigkeit und Selektivität des Flotationsprozesses nicht notwendigerweise sichergestellt. Der Geometrieparameter, der bei gegebenem Zellenvolumen die Leistungsfähigkeit bestimmt, ist die Zellenhöhe. Sie hat Einfluss auf den hydrostatischen Druck und die Hydrodynamik der Trübe, die Wegstrecke, die Partikel-Blase-Agglomerate zurücklegen müssen, sowie die Homogenität der Durchmischung. Auch die Dicke der Schaumschicht hängt vom Durchmesser-Höhe-Verhältnis ab. Ziel der Forschungsarbeiten ist es, ein besseres Verständnis der Materialverteilung und der Suspensionseigenschaften innerhalb einer Flotationszelle zu erlangen und anhand dieser Informationen aufzuklären, wie Veränderungen der Zellengeometrie die Trennleistung beeinflussen können. Zu diesem Zweck wurden erste systematische Messungen und Analysen der räumlichen Verteilung der verschiedenen Phasen innerhalb einer 160 m3 Flotationszelle im Rahmen der industriellen Anreicherung eines armen Kupfererzes durchgeführt. Die Konzepte für die Probenahme an verschiedenen vertikalen und seitlichen Positionen der Flotationszelle werden vorgestellt. Die Ergebnisse der experimentellen Arbeiten geben einen Einblick in die räumliche Verteilung der Trübe innerhalb der Flotationszelle. Auf der Grundlage der gemessenen Phasenverteilung und Konzentrationen sowie der Partikeleigenschaften an verschiedenen Positionen innerhalb der Zelle werden Implikationen für einen optimierten Entwurf von Flotationszelle und -anlage diskutiert.

Place, publisher, year, edition, pages
Springer, 2017
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
urn:nbn:se:ltu:diva-65181 (URN)10.1007/s00501-017-0658-8 (DOI)
Note

Validerad;2017;Nivå 1;2017-08-18 (andbra)

Available from: 2017-08-18 Created: 2017-08-18 Last updated: 2019-02-08Bibliographically approved

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