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Consideration of X-ray microtomography to quantitatively determine the size distribution of bubble cavities in iron ore pellets
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.ORCID iD: 0000-0003-4582-0902
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-7395-3302
LKAB, Research & Development, 983 81 Malmberget.
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2013 (English)In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 233, p. 312-318Article in journal (Refereed) Published
Abstract [en]

X-ray microtomography data of iron ore green pellets of approx. 12 mm in diameter were recorded using a commercial instrument. The reconstructed volume after thresholding represented a unique dataset consisting of a three-dimensional distribution of equiaxed objects corresponding to bubble cavities. This dataset was used to successfully validate a stereological method to determine the size distribution of spherical objects dispersed in a volume. This was achieved by investigating only a few cross-sectional images of this volume and measuring the profiles left by these objects in the cross-sectional images. Excellent agreement was observed between the size distribution of the bubble cavities obtained by directly classifying their size in the reconstructed volume and that estimated by applying the aforementioned stereological method to eight cross-sectional images of the reconstructed volume. Subsequently, we discuss the possibility of calibrating X-ray tomography data quantitatively using the size distribution of the bubble cavities as a figure of merit and the results obtained by applying the stereological method to SEM images as reference data. This was justified by considering the validity of the stereological method demonstrated by tomography, the accurate thresholding made possible by back-scattered electron imaging and the solid reproducibility of the results obtained by SEM. Using different threshold values for binarization of the X-ray microtomography data and comparing the results to those obtained by SEM, we found that X-ray microtomography can be used after proper calibration against SEM data to measure the total porosity of the bubble cavities but can only provide a rough estimate of the median diameter because of the limited resolution achieved in this study.

Place, publisher, year, edition, pages
2013. Vol. 233, p. 312-318
National Category
Chemical Process Engineering Applied Mechanics
Research subject
Chemical Technology; Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-5590DOI: 10.1016/j.powtec.2012.09.012ISI: 000311134200037Scopus ID: 2-s2.0-84867795434Local ID: 3b9114fe-ca36-477f-b8ee-002ff0f7959aOAI: oai:DiVA.org:ltu-5590DiVA, id: diva2:978464
Note
Validerad; 2013; 20120918 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Bhuiyan, Iftekhar UddinMouzon, JohanneForsberg, FredrikSjödahl, MikaelHedlund, Jonas

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