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Structural Characteristics and Hydration Kinetics of Oxidized Steel Slag in a CaO-FeO-SiO2-MgO System
School of Material Science and Engineering, North Minzu University, Yinchuan, 750021, China;Key State Laboratory of Green Building Materials, China Building Material Academy, Beijing, 100024, China.
Key State Laboratory of Green Building Materials, China Building Material Academy, Beijing, 100024, China.
School of Material Science and Engineering, North Minzu University, Yinchuan, 750021, China.
School of Material Science and Engineering, North Minzu University, Yinchuan, 750021, China.
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2019 (English)In: High Temperature Materials and Processes, ISSN 0334-6455, E-ISSN 2191-0324, Vol. 38, no 1, p. 290-300Article in journal (Refereed) Published
Abstract [en]

Although steel slag exhibits cementitious properties, the addition of steel slag in cement is still limited due to both the presence of excess iron oxides and instability of free lime and periclase. This paper proposes a method for oxidizing molten slag in air, aiming at extraction of superfluous wustite and stabilization of free lime and periclase. Mineralogical characteristics of raw slag and modified products were examined using X-ray diffraction (XRD), scanning electron microscopy equipped with backscattered electron imaging (SEM-BEI), energy dispersive spectrometry (EDS) and thermogravimetric analysis (TGA) with differential scanning calorimetry (DSC). Thermodynamic calculations were performed to aid to discuss the experimental results. The results indicate that non-magnetic wustite and periclase are transformed into magnetic spinel (magnetite/magnesioferrite) after oxidation. Temperature has a significant effect on the formation of spinel. The mass fraction of free lime decreases from 3.54 wt.% to 0.96 wt.% as a result of the conversion from free lime to calcium ferrite.

Place, publisher, year, edition, pages
Walter de Gruyter, 2019. Vol. 38, no 1, p. 290-300
Keywords [en]
magnetite, oxidation, spinel, steel slag, wustite
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-71368DOI: 10.1515/htmp-2017-0163ISI: 000460414600032Scopus ID: 2-s2.0-85054842973OAI: oai:DiVA.org:ltu-71368DiVA, id: diva2:1259313
Note

Validerad;2019;Nivå 2;2019-04-11 (oliekm)

Available from: 2018-10-29 Created: 2018-10-29 Last updated: 2019-04-24Bibliographically approved

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Yang, Qixing

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