All the fly ash samples sintered at 1200 0 C were bloated due to the gas evolving during the thermal decomposition metal sulphates, and also they melted.
📌 3 Key Takeaways
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Objective & Hypothesis:In this study, the effect of witherite (BaCO3) addition on the sintering of lignite coal fly ash taken from the Seyitömer power plant of Kütahya/Turkey was examined at temperatures of 1100, 1150 and 1200 0 C in air atmosphere.
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Key Findings & Data:Bloating of the fly ash samples sintered at 1150 0 C was prevented by shifting the decomposition temperature of CaSO4 in the fly ash to a higher temperature, and their physicomechanical properties (porosity, water absorption, bulk density and bending strength) were improved with BaCO3 addition owing to the phase transformation from CaSO4 (anhydrite) to BaSO4 (Barite) as supported by XRD analysis.
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Conclusion & Impact:All the fly ash samples sintered at 1200 0 C were bloated due to the gas evolving during the thermal decomposition metal sulphates, and also they melted.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Coal fly ash · Witherite · Sintering
Abstract
In this study, the effect of witherite (BaCO3) addition on the sintering of lignite coal fly ash taken from the Seyitömer power plant of Kütahya/Turkey was examined at temperatures of 1100, 1150 and 1200 0 C in air atmosphere. Bloating of the fly ash samples sintered at 1150 0 C was prevented by shifting the decomposition temperature of CaSO4 in the fly ash to a higher temperature, and their physicomechanical properties (porosity, water absorption, bulk density and bending strength) were improved with BaCO3 addition owing to the phase transformation from CaSO4 (anhydrite) to BaSO4 (Barite) as supported by XRD analysis. Positive effects of BaCO3, however, were not seen on the fly ash samples sintered at 1100 0 C. All the fly ash samples sintered at 1200 0 C were bloated due to the gas evolving during the thermal decomposition metal sulphates, and also they melted.
ERSOY, B., KAVAS, T., EVCİN, A., BAŞPINAR, S., SARIIŞIK, A., DİKMEN, S. (2009). PRODUCTION OF FIRED CERAMIC MATERIALS FROM FLY ASH WITH WITHERITE ADDITIVE. Afyon Kocatepe Üniversitesi Fen ve Mühendislik Bilimleri Dergisi, Cilt: 9 - Sayı: 3, 45–52. https://ajindex.com/articles/452223
Özdemir, O., and Çelik, M.S., Characterization and recovery of lignitic fly ash by products from the Tunçbilek Power Station, Canadian Metallurgical Quarterly, 41(2), Pages 143-50, 2002,
Özdemir, O., Ersoy. B., and Çelik, M.S., Separation of pozzolonic material from lignitic fly ash of Tunçbilek power station, International Ash Utilization Symposium, 2001 (http://www.flyash.info/2001/benef1/45ozdem.pdf).
Iyer, R.S., and Scott, J.A., Power station fly ash-a review of value-added utilization outside of the construction industry, Resour Conserv & Recycl., 31, Pages 217-28, 2001
Sebök, T., Simonik, J., and Kulisek, K., The compressive strength of samples containing fly ash with high content of calcium sulfate and calcium oxide, Cem. Concr. Res., 31, Pages 1101-107. 2001
Kula, İ., Olgun, A., Erdoğan, Y., and Sevinç, V., Effects of colemanite waste, coal bottom ash, and fly ash on the properties of cement, Cem. Concr. Res., 31, Pages 491-94, 2001
Alonso, J.L., and Wesche, K., Characterization of fly ash, in: Wesche K. editor. Fly ash in concrete (properties and performance), E&FN Spon/Chapman&Hall, 1991
Yılmaz, S., Sen, S., Günay, V., and Özkan, O.T., Utilisation of power fly-ash as a building material,. Tile&Brick Int., 3 (4), Pages 297-00, 1997
Pirmaksa, K., Wilhelm, M., and Wruss, W., A new approach to the production of bricks made of 100 % fly ash, Tile&Brick Int., 16 (6), Pages 428-31, 2000
Erol, M., Genç, A., Öveçoğlu, M.L., Yücelen, E., Küçükbayrak, S., and Taptık, Y., Characterization of a glass-ceramic produced from thermal power plant fly ashes, J Eur Ceram Soc, 20, Pages 2209-214, 2000
Sheng, J., Huang, B.X., Zhang, J., Zhang, H., Sheng, J., Yu, S., and Zhang, M., Production of glass from coal fly ash, Fuel, 82, Pages 181-85, 2003
Sheng, J., Vitrification of borate waste from nuclear power plant using coal fly ash, (I) Glass formulation development, Fuel 80, Pages 1365-69, 2001
Peng, F., Liang, K., Hu, A., and Shao, H., Nano-crystal glass-ceramics obtained by crystallization of vitrified coal fly ash, Fuel, 83, Pages 1973-77, 2004
Erol, M., Küçükbayrak, S., and Ersoy-Meriçboyu, A., Characterization of coal fly ash f