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Leaching Behavior of Aged Steel Slags
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.ORCID iD: 0000-0001-9297-8521
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.ORCID iD: 0000-0003-1511-8020
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
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2014 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 85, no 4, p. 607-615Article in journal (Refereed) Published
Abstract [en]

Large amounts of slag are generated by the Swedish Steel Industry each year. The Electric Arc Furnace process generates about 200 000 ton of slag per annum, from which approximately 40% is deposited. An alternative to deposit is to use slag as road construction material. However, leaching of metals from the slag can be a reason to limit slag use in road construction. The aim of this work was to investigate how stable these materials are when aged, in an environment open to seasonable weather conditions, with respect to leaching and mineralogy. Three different EAF-slags from domestic steel plants were used in this study. The materials were characterized after 0, 6, 12, 18, and 24 months to evaluate the ageing process. The analytical techniques that were used to evaluate the effect of ageing are scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and a standard test for leaching. The changes in ageing behavior differ between the three materials. The conductivity and the pH decreases with time for all samples. The leaching of calcium, chromium as well as aluminum decreases with time while the leaching of magnesium increases. CaCO3 was formed on slag surfaces as CaO reacts with moisture and CO2 from the air.

Place, publisher, year, edition, pages
2014. Vol. 85, no 4, p. 607-615
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-10049DOI: 10.1002/srin.201300119ISI: 000333909700012Scopus ID: 2-s2.0-84898076964Local ID: 8ce7bd47-52a1-48e4-89b2-c44fffaa66f9OAI: oai:DiVA.org:ltu-10049DiVA, id: diva2:982989
Note
Validerad; 2014; 20130909 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Engström, FredrikLidström-Larsson, MargaretaSamuelsson, CaisaSandström, ÅkeRobinson, RyanBjörkman, Bo

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Engström, FredrikLidström-Larsson, MargaretaSamuelsson, CaisaSandström, ÅkeRobinson, RyanBjörkman, Bo
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Minerals and Metallurgical EngineeringDepartment of Civil, Environmental and Natural Resources Engineering
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Steel Research International
Metallurgy and Metallic Materials

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