Effect of Domestic Dolomite Additives Used in the Refractory Production

H. Aygül Yeprem

doi:10.3139/120.100872

Article

Effect of Domestic Dolomite Additives Used in the Refractory Production

H. Aygül Yeprem

Published/Copyright: May 26, 2013

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From the journal Materials Testing Volume 50 Issue 3

Abstract

In this study, the effect of alumina addition on dolomite refractory (extracted from Konya/Turkey) which has been planned to use in refractory industry was investigated. The aim of the study is to increase the brownmillerite phase which aids the sintering process of dolomite. For that purpose, 0.5 wt-% alumina powder (including 99,5% Al₂O₃) was added to 3 to 6 mm fraction dolomite, and a sintering operation was carried out at a temperature of 1600, 1650 and 1700°C for 3 different soaking times (2, 4 and 6 h). The resultant phases occured at dolomas (sintered dolomite) were investigated and evaluated by X-Ray diffraction pattern (XRD) and analized by scanning electron microscopy (SEM). It turned out that periclase, lime also portlandite, alite, forsterite, tricalcium aluminate, brownmillerite, merwinite were created. The densities of dolomas were measured. Temperature and increase in time were investigated but convenience in density could not be established.

Kurzfassung

Auswirkungen von heimischen Dolomit-Additiven in der Feuerfestproduktion. Im vorliegenden Beitrag werden die Auswirkungen von Aluminiumzusätzen auf Feuerfestprodukte aus Dolomit der in Konya, Türkei extrahiert wurde und für die Nutzung in der Feuerfestindustrie vorgesehen ist, untersucht. Das Ziel der Studie besteht darin, den Anteil der Braun-Millerit-Phase zu erhöhen, da diese den Sinterungsprozess des Dolomits unterstützt. Zu diesem Zweck wurden 0,5 Gewichtsprozent Aluminiumpulver einschließlich 99,5 Prozent Al₂O₃ zu den 3 bis 6 mm dicken Dolimitanteilen zugemischt und der Sinterungsvorgang bei Temperaturen von 1600, 1650 und 1700 °C über drei verschiedene Soaking-Zeiten von 2, 4 und 6 Stunden ausgeführt. Die resultierenden Phasen, die im Dolomas, also dem gesinterten Dolomit, auftraten, wurden mittels Röntgendiffraktometrie und Rasterelektronenmikroskopie untersucht, analysiert und evaluiert. Es stellte sich heraus, dass bei diesem Vorgang Periklas und Calciumoxid, aber auch Portlandit, Alit, Forsterit, Tricalciumaluminat, Braun-Millerite und Merwenit erzeugt werden. Die Dichte des Dolomas wurde bestimmt, konnte aber nicht zufriedenstellend eingestellt werden, obwohl die Temperaturen und Zeiten variiert wurden.

Dr. Yeprem is currently working as an assistant professor at Yildiz Technical University, Department of Metallurgy and Materials Engineering, Istanbul-Turkey. She is about to be appointed to an associate professor position in the field of ceramic and refractory materials. She received both her BSc and MSc degrees from Yildiz Technical University, Department of Chemical Engineering in 1985 and 1988, respectively. She obtained her PhD degree from the same university, Department of Metallurgy and Materials Engineering in 2003 on Sintering Characterization of a Local Dolomite used for the Production of Dolomite Based Refractories.

References

1 J. H.Chesters: Steelplant Refractories Testing, Research and Development, Sheffield (1973)Search in Google Scholar

2 A.Güney: Turkish Mining Assosiation, Turkish Dolomite Inventory, Istanbul Mining Export Union, Istanbul (1999).Search in Google Scholar

3 A. BSearle, R.W.Grimshaw: The Chemistry and Physics of Clays and Other Ceramic Materials, Ernest Benn Limited, 3. Edition, London (1960)Search in Google Scholar

4 A.M.Alper (Ed.): Part I: Magnesia, Lime and Chrome Refractories, Academic Press, New York (1970)Search in Google Scholar

5 F.Trojer: Mineralogie basissche Feurfest-Produkte, Springer-Verlag, New York (1981)10.1007/978-3-7091-8622-0Search in Google Scholar

6 Didier: Refractory Techniques-Refractory Materials and Their Properties, English Handbook (1982)Search in Google Scholar

7 G.Routschka: Feuerfeste Werkstoffe, Vulkan Verlag, 2. Auflage, Essen (1987)Search in Google Scholar

8 M.O’Driscoll: Refractory Dolomite, Industrial Minerals (1998), June, pp. 35–43Search in Google Scholar

9 H. A.Yeprem: Characterization of sintering of a local dolomite for production of dolomite refractory, PhD thesis, Yildiz Technical University, Istanbul (2003)Search in Google Scholar

10 M. A.Serry, A. G. M.Othman, L. G.Girgis, et al.: Phase equilibrium, microstructure and properties of some magnesite-chromite refractories, Journal of Materials Science31 (1996), No. 18, pp. 4913–492010.1007/BF00355880Search in Google Scholar

11 Y.Satyoko, W. E.Lee: Dissolution of dolomite and doloma in silicate slag, British Ceramic Transaction98 (1999), pp. 261–26510.1179/096797899680552Search in Google Scholar

12 H. A.Yeprem: Effect of iron oxide addition on the hydration resistance and bulk density of doloma, Journal of the European Ceramic Society27 (2007), No. 2007-2, pp. 1651–165510.1016/j.jeurceramsoc.2006.05.010Search in Google Scholar

13 N.Erdogan, R.Yildiz: Technology of Magnesite and Basic Refractories, Lale Press Kutahya (1995)Search in Google Scholar

14 G. I.Antonov, V. P.Nedosvitii, A. S.Kulik, O. M.Semenenko, V.Yu Prokudin: Stabilized Dolomite-Periclase Articles, Refractories and Industrial Ceramics38 (1997), No. 1997-7, pp. 326–32810.1007/BF02768049Search in Google Scholar

Published Online: 2013-05-26

Published in Print: 2008-03-01

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https://doi.org/10.3139/120.100872