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This paper presents the findings on thermal expansion behavior of slaked lime doped rice husk silica (RHS) refractory monitored between 25 ℃ and 1500 ℃. It also reports the phase transition analysis within the temperature range of 850–1450 ℃. A sudden expansion of 0.7% noticed at 220 ℃ is due to the transformation of α-cristobalite to β-cristobalite. The highest expansion (0.85%) reached within the temperature range of 650–850 ℃, remains almost constant for the investigated temperature range, and is not high enough to cause macro cracks in the refractory. The phase transition order is similar to those reported for quartzite refractory after 600 ℃, though the crystallization temperature is lowered due to the presence of the dopant. Modulus of rupture, apparent porosity, bulk density, refractoriness and reheat change are reported and their results meet with the standards qualifying them for use in coke ovens.


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Thermal expansion behavior, phase transitions and some physico-mechanical characteristics of fired doped rice husk silica refractory

Show Author's information Benjamin Iyenagbe UGHEOKE*,a( )Othman MAMATaB. ARI-WAHJOEDIb
Department of Mechanical Engineering, Universiti Teknologi PETRONAS, Bandar Seri Iskandar 31750, Tronoh, Perak, Malaysia
Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS, Bandar Seri Iskandar 31750, Tronoh, Perak, Malaysia

Abstract

This paper presents the findings on thermal expansion behavior of slaked lime doped rice husk silica (RHS) refractory monitored between 25 ℃ and 1500 ℃. It also reports the phase transition analysis within the temperature range of 850–1450 ℃. A sudden expansion of 0.7% noticed at 220 ℃ is due to the transformation of α-cristobalite to β-cristobalite. The highest expansion (0.85%) reached within the temperature range of 650–850 ℃, remains almost constant for the investigated temperature range, and is not high enough to cause macro cracks in the refractory. The phase transition order is similar to those reported for quartzite refractory after 600 ℃, though the crystallization temperature is lowered due to the presence of the dopant. Modulus of rupture, apparent porosity, bulk density, refractoriness and reheat change are reported and their results meet with the standards qualifying them for use in coke ovens.

Keywords:

rice husk silica refractory, thermal expansion, phase transitions, physico-mechanical characteristics
Received: 17 November 2012 Revised: 03 February 2013 Accepted: 06 February 2013 Published: 06 April 2013 Issue date: March 2013
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DOI
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Publication history

Received: 17 November 2012
Revised: 03 February 2013
Accepted: 06 February 2013
Published: 06 April 2013
Issue date: March 2013

Copyright

© The author(s) 2013

Acknowledgements

This work was supported in part by the Malaysian Ministry of Science, Technology & Innovation (MOSTI) E-Science Fund (Project Code 03-02-02-SF0089) and UTP graduate assistantship scheme. The authors appreciate these kind gestures.

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Open Access: This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

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