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The Kinetics of Oxidation of Liquid FeO-MnO-CaO-SiO2 Slags in Air

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Abstract

The oxidizing kinetics of the liquid FeO-MnO-CaO-SiO2 slags in air has been studied in the temperature range of 1500 K to 1600 K (1227 °C to 1327 °C) by using a thermogravimetric analysis (TGA). The reaction products after oxidation were analyzed by X-ray diffraction analysis (XRD). The surface topography of the obtained samples was analyzed by scanning electron microscopy (SEM). The products after oxidation showed the presence of manganese ferrite/magnetite and calcium silicate for all the samples in the experimental temperatures range. The oxidation process was developed through the following three consequent steps: (1) incubation period followed by a chemical reaction controlled stage (2) and later (3) diffusion of oxygen through the product layer. Appropriate mathematical relationships were constructed for these steps. Combining equations corresponding to the mechanism of oxidation, the experimental results were consistently reproduced, validating thereby the theoretical analysis.

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Acknowledgments

The current work was supported financially through the project Eco-Steel Production (Sub project no.: 88035) of the Swedish Foundation for Strategic Environmental Research (MISTRA) administered by Swedish Steel Producers Association (Jernkontoret). I would like to express my sincere gratitude to Prof. Seshadri Seetharaman for his guidance and very useful discussion. I would like to express my special thanks to Prof. Volodymyr Shatokha for his constructive comments. I am also thankful to Dr. Jinichiro Nakano for his help during the FactSage calculations and to Dr. Lyubov Belova and Ms. Anastasiia Riazanova for carrying out topography analyses of samples in a Dual Beam FIB/SEM Nova 600 NanoLab.

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Authors and Affiliations

  1. Royal Institute of Technology, SE-100 44, Stockholm, Sweden

    Anna Semykina (PhD and Senior Researcher)

  2. National Metallurgical Academy of Ukraine, Dnipropetrovsk, 49600, Ukraine

    Anna Semykina (PhD and Senior Researcher)

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  1. Anna Semykina
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Correspondence to Anna Semykina.

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Manuscript submitted July 22, 2010.

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Semykina, A. The Kinetics of Oxidation of Liquid FeO-MnO-CaO-SiO2 Slags in Air. Metall Mater Trans B 43, 56–63 (2012). https://doi.org/10.1007/s11663-011-9576-4

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  • DOI: https://doi.org/10.1007/s11663-011-9576-4

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