Abstract
Corrosion mechanisms between high melting synthetic ferronickel slags and refractory were investigated. The used slags were prepared by mixing and melting of specific oxides. Substrates of the applied refractory material and specimens of FeNi slags were heated in a hot stage microscope up to 1650 °C. The experiments were performed under a defined gas atmosphere of 60% CO and 40% CO2. A further examination of the formed phases between slag and refractory occurred by scanning electron microscope. The investigations indicate that the slag penetrates between magnesia grains and partly dissolves magnesia. Spot analyses show that iron diffuses into the magnesia grains, which transform to magnesiawustite, meanwhile SiO2 forms different types of olivine like forsterite and monticellite. Thermodynamic calculations confirm the formation of these phases. The combination of practical lab scale experiments and thermodynamic calculations should finally contribute to an improvement of the refractory lifetime and performance.
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The financial support by the Austrian Federal Ministry of Digital, Business and Enterprise and the National Foundation for Research, Technology and Development CDL-TM is gratefully acknowledged.
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Sagadin, C., Luidold, S., Wagner, C., Spanring, A. (2018). High Temperature Phase Formation at the Slag/Refractory Interphase at Ferronickel Production. In: Davis, B., et al. Extraction 2018. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-95022-8_10
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DOI: https://doi.org/10.1007/978-3-319-95022-8_10
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