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Image-Based Analysis of Weathered Slag for Calculation of Transport Properties and Passive Carbon Capture

Published online by Cambridge University Press:  04 July 2022

Faisal W. K. Khudhur*
Affiliation:
School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK
Alice Macente
Affiliation:
School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK Department of Civil and Environmental Engineering, University of Strathclyde, Glasgow G1 1XJ, UK
John M. MacDonald
Affiliation:
School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK
Luke Daly
Affiliation:
School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK Centre for Microscopy and Microanalysis, University of Sydney, Sydney, 2006 NSW, Australia Department of Materials, University of Oxford, Oxford OX1 3PH, UK
*
*Corresponding author: Faisal W. K. Khudhur, E-mail: f.khudhur.1@research.gla.ac.uk
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Abstract

Weathering of silicate-rich industrial wastes such as slag can reduce emissions from the steelmaking industry. During slag weathering, different minerals spontaneously react with atmospheric CO2 to produce calcite. Here, we evaluate the CO2 uptake during slag weathering using image-based analysis. The analysis was applied to an X-ray computed tomography (XCT) dataset of a slag sample associated with the former Ravenscraig steelworks in Lanarkshire, Scotland. The element distribution of the sample was studied using scanning electron microscopy (SEM), coupled with energy-dispersive spectroscopy (EDS). Two advanced image segmentation methods, namely trainable WEKA segmentation in the Fiji distribution of ImageJ and watershed segmentation in Avizo ® 9.3.0, were used to segment the XCT images into matrix, pore space, calcite, and other precipitates. Both methods yielded similar volume fractions of the segmented classes. However, WEKA segmentation performed better in segmenting smaller pores, while watershed segmentation was superior in overcoming the partial volume effect presented in the XCT data. We estimate that CO2 has been captured in the studied sample with an uptake between 20 and 17 kg CO2/1,000 kg slag for TWS and WS, respectively, through calcite precipitation.

Type
Materials Science Applications
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of the Microscopy Society of America

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