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Behavior of basic refractories at high temperatures in steelmaking processes; thermodynamics and implications for usability of olivine as refractory materials

Andreas Pack, Stephan Hoernes, Thomas Wather and Rainer Bross
Behavior of basic refractories at high temperatures in steelmaking processes; thermodynamics and implications for usability of olivine as refractory materials
European Journal of Mineralogy (February 2003) 15 (1): 193-205

Abstract

Basic unshaped refractories are used as tundish lining in the continuous casting steelmaking process. These refractories are composed of forsteritic olivine and periclase. Slag covers the steel bath in the tundish in order to protect the melt from reoxidation. Using TEM, we demonstrate that the fayalite component of the olivine is reduced to metallic iron giving the olivine a dusty appearance in transmitted light. The reduced olivine appears stable under high temperature reducing conditions. We suggest that diffusion of Mg (super 2+) from the outer part of the olivine into empty Fe (super 2+) lattice positions in the interior prohibits formation of SiO (sub 2) as by-product of the fayalite reduction. Some of the silica may also have left the olivine in form of gaseous SiO. Periclase reacts with Al (sub 2) O (sub 3) from the tundish slag to form spinel. We show that Mn from the steel melt is oxidized and enriched in tundish slag as well as in the refractory. The steel melt is the only source of Mn in the slag. Thermodynamic calculations show that equilibrium fractionation of Fe and Mn between steel melt and slag results in effective separation of Fe (in steel) and Mn (in oxides/silicates).


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 15
Serial Issue: 1
Title: Behavior of basic refractories at high temperatures in steelmaking processes; thermodynamics and implications for usability of olivine as refractory materials
Affiliation: Universitat Bonn, Mineralogisch-Petrologisches Institut, Bonn, Federal Republic of Germany
Pages: 193-205
Published: 200302
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 33
Accession Number: 2003-026010
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendix
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Universitat Koln, DEU, Federal Republic of GermanyWeerulin Feuerfeste Materialien GmbH & Co., DEU, Federal Republic of Germany
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute.
Update Code: 200309
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