Investigation of thermo-mechanical and refractory properties of aluminosilicate ramming mass across rotary furnace lining
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The effect of sintering temperature on the properties of aluminosilicate ramming mass was investigated. Two refractory compositions, namely clay – silica – mica – bentonite (80 – 10 – 20 – 4) and clay – silica – mica – Durax (80 – 10 – 20 – 4), were investigated. Each of these compositions was thoroughly mixed in a laboratory sand mixer using 5% tempering water. Moulded samples of ∅50 mm x 50 mm height were then prepared from them using the AFS standard ramming machine. The samples were dried at 120°C for 110 min. These samples were fired at different temperatures of 1000, 1100, 1200, 1300, 1400, and 1500°C. The fired samples were thereafter tested for such properties as apparent porosity, cold compression strength, linear shrinkage, volumetric firing shrinkage, thermal shock resistance, and refractoriness at these temperatures. The results obtained indicated that the rise in cold compression strength for all samples with increasing temperature reaches a maximum before failure at the refractoriness point of 1500°C. The apparent porosity and volumetric shrinkage decrease with increasing temperature. At all temperature ranges, the materials exhibit excellent thermal shock resistance. These compositions are therefore recommended for lining of rotary furnaces for melting of cast iron.
Keywordsaluminum-silicate ramming mass sample firing temperature properties definition
- 1.M. O. Adeoye, Effect of Microstructures on the Thermal Properties of Refractory Materials, Unpublished M. Sc. thesis, Obafemi Awolowo University, Ile–Ife (1986).Google Scholar
- 2.J. O. Borode, O. O. Onyemaobi, and J. A. Omotoyinbo, “Suitability of some Nigerian Clays as Refractory Raw Materials,” Niger. J. Eng. Manag., 3, 14 – 18 (2000).Google Scholar
- 3.J. D. Gilchrist Fuels Furnaces and Refractories, Pergamon Press Ltd., London (1977).Google Scholar
- 4.S. B. Hassan, “Effect of Silicon Carbide on Some Refractory Properties of Kankara Clay,” in: Proceedings of the Nigerian Metallurgical Society (2001).Google Scholar
- 5.J. Hlavac, The Technology of Glass and Ceramics: An Introduction, Elsevier Scientific Publishing Company, New York (1983), pp. 11 – 16, 390 – 400.Google Scholar
- 6.E. W. Lee and W. M. Rainforth, Ceramic Microstructure: Properties and Control, Chapman and Hall, London (1994), pp. 1 –66, 452 –507.Google Scholar
- 7.O. A. Olasupo, “Development of Ramming Mass from Indigenous Refractory materials for Lining Melting Furnaces,” M. Eng. Thesis, The Federal University of Technology, Akure (2003).Google Scholar
- 8.O. A. Olasupo, G. O. Oluwadare, and J. O. Borode, “Development of Ramming Mass from Some Nigerian Refractory Raw Materials,” in: Proceedings of the Nigerian Materials Congress (NIMACON-2002), Engineering Materials Development Institute, Akure, Nigeria (2002), pp. 93 – 98.Google Scholar
- 9.Mark Prado, Producing high-temperature Refractories, www.permanent.com (1999).
- 10.C. Rashid Refractories: Manufacture, Properties and Applications, Prentice-Hall, India (1986).Google Scholar
- 11.C. E. Semler, Refractories review; the importance of microstructure, www.ceramicindustry.com (2002).