Characterization of iron oxide waste scales obtained by rolling mill steel industry

Kargin J. Valladares L.D.L.S. Borja-Castro L.E. Xize J. Mukhambetov D.G. Konyukhov Y.V. Moreno N.O. Dominguez A.G.B. Barnes C.H.W.
December 2022 Springer Science and Business Media Deutschland GmbH

Hyperfine Interactions
2022 #243 Issue 1

Every year, the steelmaking industry produces millions of tons of slags resulting in pollution to the environment. Among the waste, secondary metals and scales rich in iron oxides are also thrown away. There is a need to treat the steel waste in a reasonably way to protect the environment and proposing new cheap technologies for producing advanced materials. In this study we report the morphological and structural characterization of waste scales generated during roll milling steel process at JSC “Arcelor Mittal Temirtau”. The raw slag and annealed at 1000 °C were measured by X-ray diffraction (XRD), scanning electron microscopy adapted with energy dispersive X-ray (SEM- EDX), magnetometry and Mössbauer Spectroscopy (MS). Fe and O were detected by EDX as main chemical elements and Si, S, Ca, Mg, C and Al as minimal elemental composition. XDR for the raw sample revealed α-Fe₂O₃ (hematite) and Fe₃O₄ (magnetite) as principal and secondary phase, respectively; whereas monophasic α-Fe₂O₃ is detected for the scales annealed at 1000 °C. Magnetometry measurements show the Verwey transition for the raw sample and the Morin transition for the annealed at 1000 °C; those are fingerprints for the presence of magnetite and hematite, respectively. MS measurements for the raw sample consist of 6 small peaks of absorption and a broad two-lines absorption peak in the central part. The doublets are associated to the hyperfine parameters belonging to wustite. Magnetite is related to the hyperfine parameters for two sextets in octahedral Fe^2.5+ and tetrahedral Fe³⁺sites and a small sextet that resembles the Mössbauer parameters of α-Fe₂O₃. Only a well crystallized and weakly ferromagnetic sextet confirm the presence of α-Fe₂O₃ phase for the sample annealed at 1000 °C due to thermal oxidation.

Iron oxide , Mössbauer spectroscopy , Rolling mill steel , Steel scales , Steel slag

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L. N. Gumilyov Eurasian National University, Nur-Sultan, 010000, Kazakhstan
Cavendish Laboratory, Department of Physics, University of Cambridge, J.J. Thomson Ave, Cambridge, CB03 0HE, United Kingdom
School of materials Sciences and Engineering, Northeastern University, No 11, Lane 3, Wenhua Road, Heping district, Shenyang, 110819, China
Laboratorio de Cerámicos y Nanomateriales, Facultad de Ciencias Físicas, Universidad Nacional Mayor de San Marcos, Ap. Postal, Lima, 14-0146, Peru
Department of Information Systems, Almaty Academy of Economics and Statistics, Almaty, 050035, Kazakhstan
National University of Sciences and Technology MISIS, Leninsky Ave. 4, Moscow, 119991, Russian Federation
Departamento de Física, Universidade Federal de Sergipe, SE, São Cristóvão, 49100-000, Brazil

L. N. Gumilyov Eurasian National University
Cavendish Laboratory
School of materials Sciences and Engineering
Laboratorio de Cerámicos y Nanomateriales
Department of Information Systems
National University of Sciences and Technology MISIS
Departamento de Física

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