Chapter 15. Rebonded Spinel for Use in Oxy-Fuel Superstructure Applications

  1. John Kieffer
  1. M. Dunkl,
  2. D. Schlacht,
  3. G. Boymanns and
  4. F. Gebhardt

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294598.ch15

A Collection of Papers Presented at the 60th Conference on Glass Problems: Ceramic Engineering and Science Proceedings, Volume 21, Issue 1

A Collection of Papers Presented at the 60th Conference on Glass Problems: Ceramic Engineering and Science Proceedings, Volume 21, Issue 1

How to Cite

Dunkl, M., Schlacht, D., Boymanns, G. and Gebhardt, F. (2000) Rebonded Spinel for Use in Oxy-Fuel Superstructure Applications, in A Collection of Papers Presented at the 60th Conference on Glass Problems: Ceramic Engineering and Science Proceedings, Volume 21, Issue 1 (ed J. Kieffer), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294598.ch15

Author Information

  1. Vesuvius-VGT-DYKO, Düsseldorf, Germany

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2000

ISBN Information

Print ISBN: 9780470375662

Online ISBN: 9780470294598

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Keywords:

  • refractory materials;
  • laboratory tests;
  • oxyl-fuel superstructure;
  • thermodynamic calculations;
  • alkaline hydroxide

Summary

New challenges are presented to the refractory materials in the crown and superstructure of oxy-fuel fired glass melting furnaces in comparison to air-fuel-fired glass melting furnaces. In glass melting furnaces that are oxy-fuel fired, the water steam partial pressure above the melt increases strongly. In the case of alkaline earth, alkaline-silicate glass melts together with the water steam partial pressure the alkaline hydroxide partial pressure increases with a factor of three in comparison to an air-fuel firing system. This leads to an aggressive action to refractory lining in the crown and superstructure. After extensive thermodynamic calculations and laboratory tests, a pure spinel refractory material (MgO-Al2O3) was developed for application in the crown and superstructure of oxy-fuel-fired glass melting furnaces. The chemical and physical properties as well as the results of corrosion tests under oxy-fuel conditions of this direct-bonded, fused spinel material will be discussed. Because of its high corrosion resistance against alkaline attack and the excellent behavior of the creeping under load even at a temperature of 1650°C, this spinel material can be proposed for successful application as crown and superstructure refractory for oxy-fuel-fired glass melting furnaces.