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Formation of Spinel Phases in Oxidized BOF Slag under Different Cooling Conditions
School of Material Science and Engineering, Beifang University of Nationalities, Yinchuan 750021, China.
China Building Material Academy, Key State Laboratory of Green Building Materials, Beijing 100024, China.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
School of Material Science and Engineering, Beifang University of Nationalities, Yinchuan 750021, China.
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2017 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344XArticle in journal (Refereed) Epub ahead of print
Abstract [en]

To enhance utilization of wastes generated from steelmaking, a BOF slag sample from Ning Steel group in China is treated by oxidizing at 1500 °C for 30 min and then cooled by different methods. The treated samples are characterized, in combination with calculations using FactSage 6.4. XRD results show that iron oxides in BOF slag are converted largely by the oxidation to spinel phases, Fe3O4 and MgFe2O4, which also eliminates free CaO and MgO. EDS analyses show Fe element existing in di-calcium silicate and glass phase, which are Fe3+ ions formed by oxidation. An incorporation of Fe3+ ions into crystal structures has stabilized high temperature polymorph of C2S, β-C2S, and α’-C2S, in the treated slag samples. Fe3+ ions may also act as a network former to facilitate glass formation. This may make it possible for the glass and α’-C2S phase to complement each other, leading to a higher hydraulicity, while the BOF slag, after the spinel separation, is blended in cements. Some suggestions are proposed, based on the present and early studies, to enhance hydraulicity for the BOF slag, as well as grain sizes of spinel phases, which may result in economic and environmental benefits for steel and cement industries.

Place, publisher, year, edition, pages
2017.
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
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URN: urn:nbn:se:ltu:diva-64098DOI: 10.1002/srin.201700066OAI: oai:DiVA.org:ltu-64098DiVA: diva2:1110709
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Available from: 2017-06-16 Created: 2017-06-16 Last updated: 2017-06-16

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