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Formation of MgFe2O4 and recycling of iron from modified BOF slag by magnetic separation
Department of Ferrous Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing.
Department of Ferrous Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing.
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering. School of Materials Science and Engineering, Beifang University of Nationalities, Yinchuan, Ningxia.
2017 (English)In: Kang T'Ieh / Iron and Steel, ISSN 0449-749X, Vol. 52, no 7, 104-110 p.Article in journal (Refereed) Published
Abstract [en]

Recycling of iron oxide from BOF slagshas always been a difficult issue in metallurgy. The core of this study was transforming the iron oxide into ferromagnetic phase MgFe2O4 by modifying industrial BOF slag appropriately first, and then recycling the iron resources by magnetic separation. The effect of basicity and calcination temperature on the formation of MgFe2O4 in synthetic BOF slags was investigated first, and then the industrial BOF slag was modified. Various experiments and analyses such as XRD, SEM-EDS, Factsage thermodynamic simulation and chemical analyses were conducted.The results show that the optimal basicity was 2, and the optimal calcination temperatures were 1 250 and 1 300℃. Moreover, MgFe2O4 was formed in modified BOF slag by mixing the industrial BOF slag with 6% SiO2 first, and then cooling the modified BOF slag from 1 400 to 1 270℃ at a rate of 1℃/min. After magnetic separation, the total Fe content in magnetic slag increased by 15.80%, to 37.00%, compared with that in the industrial BOF slag. This is better than the direct magnetic separation of iron oxide without any treatment

Place, publisher, year, edition, pages
Chinese Society for Metals , 2017. Vol. 52, no 7, 104-110 p.
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-66401DOI: 10.13228/j.boyuan.issn0449-749x.20170003Scopus ID: 2-s2.0-85032382015OAI: oai:DiVA.org:ltu-66401DiVA: diva2:1154998
Available from: 2017-11-06 Created: 2017-11-06 Last updated: 2017-11-24Bibliographically approved

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