Utilization of coal fly ash as a raw material for refractory production
Keywords:Fireclay brick, Coal fly ash, Fire clay
AbstractIn this research, fireclay bricks were produced using fire clay and coal fly ash as raw materials. Coal fly ash was added to the mixture from 10-50 wt%. The disk shape samples were sintered at the temperatures of 1,100-1,400Â°C. The mechanical property, thermal property, phase structure and microstructure of the fireclay bricks were studied. It was found that coal fly ash can be used in the fabrication of fireclay bricks. The lower linear shrinkage and lower thermal conductivity were obtained as the higher amount of coal fly ash was added.Â However, bulk density and strength were lower in the samples contained coal fly ash.Â The effects of coal fly ash on the phase structure and microstructure of the fireclay bricks were investigated using XRD and SEM technique, respectively. Mullite phase decreased with the higher coal fly ash added, whereas anorthite phase increased.
R. S. Kalyoncu, “Coal combustion products,” World Coal Association, London, Report number 19, 2001.
B. H. Bac, B. X. Nam, V. D. Hieu and N. T. Dung, “Characterization of a Vietnamese coal fly ash and its possible utilizations” present at The 2nd International Conference on Advances in Mining and Tunneling, Hanoi, Vietnam, 2012.
I. Kourti and C. R. Cheeseman, “Properties and microstructure of lightweight aggregate produced from lignite coal fly ash and recycled glass,” Resources, Conservation and Recycling, vol. 54, pp. 769–775, 2010.
E. P. Kearsleya and P. J. Wainwright, “The effect of high fly ash content on the compressive strength of foamed concrete,” Cement and Concrete Research, vol. 31, pp. 105 -112, 2001.
X. Lingling, G. Wei, W. Tao, and Y. Nanru, “Study on fired bricks with replacing clay by fly ash in high volume ratio,” Construction and Building Materials, vol. 19, pp. 243–247, 2005.
S. Andini, R. Cioffi, F. Colangelo, T. Grieco, F. Montagnaro, and L. Santoro, “Coal fly ash as raw material for the manufacture of geopolymerbased products,” Waste Management. vol. 28, pp. 416–423, 2008.
A. Terzić, L. Andrić, and V. Mitić, “Mechanically activated coal ash refractory bauxite shotcrete microfiller: Thermal interactions mechanism investigation,” Ceramics International, vol. 40, pp. 12055-12065, 2014.
S. B. Hassan and V. S. Aigbodion, “Effect coal ash on some refractory properties of aluminosilicate (Kankara) clay for furnace lining,” Egyptian Journal of basic and applied sciences, vol. 1, pp. 107-114, 2014.
J. G. Otero, F. Blanco, M. P. Garcia, and J. Ayala, “Manufacture of refractory insulating bricks using fly ash and clay,” British Ceramic Transactions, vol. 103, pp. 181-186, 2004.
American Society for testing and Material, “ASTM Designation C20-00, C326: General Product, Chemical Specialties, and End Use Products,” in Annual book of ASTM Standards, USA: ASTM International, 2005, pp. 6-9.
Y. Han, C. Li, C. Bian, S. Li,and C.-A. Wang, “Porous anorthite ceramics with ultra-low thermal conductivity,” Journal of the European Ceramic Society, vol. 33, pp. 2573- 2578, 2013.
A. A. Priogov, V. P. Rakina, M. M. Mirakyan, and N. V. Volkov, “Anorthite insulating refractory,” Refractory, vol. 11, pp. 36–40, 1970.
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