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Kinetics of the Oxidation Modification Process of CaO-SiO2-FeO-MgO Slag: [CaO-SiO2-FeO-MgO体系钢渣的氧化改质动力学研究]
School of Material Science and Engineering, North Minzu University, Yinchuan, China.
China Building Material Academy, Key State Laboratory of Green Building Materials, Beijing, China.
School of Material Science and Engineering, North Minzu University, Yinchuan, China.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
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2018 (English)In: Cailiao Daobao/Materials Review, ISSN 1005-023X, Vol. 32, no 2, p. 650-656, 671Article in journal (Refereed) Published
Abstract [en]

An investigation of mineralogical phases in industrial slag transferred from non-magnetic to magnetic substances was carried out in this study, aiming at extraction of superfluous wustite and stabilization of free lime and free periclase. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were employed to investigate the mineralogy and phase distribution. Wet magnetic separation was conducted to determine the recovery rate of iron. The thermodynamic and kine-tic calculations for the oxidation of steel slag in a CaO-SiO2-FeO-MgO system were also performed, and the results were compared with a CaO-SiO2-FeO system. XRD analysis and SEM-EDS observation confirmed the conversion from non-magnetic wustite to magnetite spinel (magnetite/magnesioferrite) after oxidation. Magnetic separation experiment indicated that the optimal oxidation temperature is 1 100℃, which coincided well with the thermodynamic calculations. The addition of periclase had a significant influence on the formation of spinel and leaded to the presence of spinel under a partial pressure of oxygen range log10(PO2)=4.3 (correspon-ding to air). The oxidation process of steel slag could be divided into three steps: initial incubation, chemical reaction and diffusion. 

Place, publisher, year, edition, pages
Cailiao Daobaoshe/ Materials Review , 2018. Vol. 32, no 2, p. 650-656, 671
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-70800DOI: 10.11896/j.issn.1005-023X.2018.04.029Scopus ID: 2-s2.0-85052281927OAI: oai:DiVA.org:ltu-70800DiVA, id: diva2:1246462
Available from: 2018-09-07 Created: 2018-09-07 Last updated: 2018-09-28Bibliographically approved

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Yang, Qixing

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