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A study on the black core formation of artificial lightweight aggregates at various sintering atmospheres  

Kim, Yoo-Taek (Department of the Materials Engineering, Kyonggi University)
Ryu, Yu-Gwang (Department of the Materials Engineering, Kyonggi University)
Jang, Chang-Sub (Department of the Materials Engineering, Kyonggi University)
Lee, Ki-Gang (Department of the Materials Engineering, Kyonggi University)
Kang, Seung-Gu (Department of the Materials Engineering, Kyonggi University)
Kim, Jung-Hwan (Department of the Materials Engineering, Kyonggi University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.19, no.6, 2009 , pp. 318-323 More about this Journal
Abstract
The lightweight aggregates made of bottom ash (70 wt%) and dredged soil (30 wt%) were prepared to investigate the property differences at various sintering atmospheres. The green aggregates were sintered at $1150^{\circ}C$ and $1200^{\circ}C$ with oxidized, neutralized and reduced atmospheres. The aggregates sintered with oxidized atmosphere showed a clear border between shell and black core area. However, the aggregates sintered with a reduced atmosphere showed only black core area in the entire cross-section of the aggregates. The black core area of the aggregates sintered with a neutralized atmosphere increased with increasing $N_2$ gas flow rates. It was determined that the sintering atmosphere was similar to that of rotary kiln when the CO gas flow was 100 cc/min to make a reduced atmosphere in tube furnace. The water absorption rates of both aggregates from tube furnace with reduced atmosphere and rotary kiln were very similar to each other.
Keywords
Lightweight aggregates; Bottom ash; Black core; Sintering atmosphere;
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  • Reference
1 A. Barba, A.F. Negre, M.J. Orts and A. Escardino, "Oxidation of black core during firing of ceramic ware-3; influence of the thickness of the piece and the compositionof the black core", Br. Ceram. Trans. J. 91 (1992) 36
2 V.Z. Abdrakhimov and E.C. Abdrakhimovba, "Formation of the black core in high speed firing of floor tiles", Glass and Ceramics 56, Nos. 7-8 (1999) 263   DOI   ScienceOn
3 Jon Pacini, "Bloating and black coring", Laguna Clay Co, January (1999)
4 F. NNegre, A. Barba, J.L. Amoros and A. Escarkino, "Oxidation of black coring during the firing of ceramic ware-2. process kinetics", Br. Ceram. Trans. J. 91 (1992) 5
5 Y.J. Joo and M.S. Oh, "Unburnt carbon combution in the production of light weight sintered fly ash", Proceeding of KSEE conference (2002) 91
6 A. Escardino, A. Barba, A. Blasco and F. Negre, "Oxidation of black core during firing of ceramic ware; 4 Relationship between effective diffusity of oxygen through oxidised layer and properties characterising its porous structure", British Ceramic Transactions 94(3) (1995)
7 J.Y. Park and Y.T. Kim, "Microstructual observation of artificial aggregate at various sintering atmosphere", J. Kor. Crystal Technology 16 (2006) 71
8 B.K. Kara-sal, D.Kh. Sat, Yu.D. Kaminskii and A.P. Ochur-ool, "Effect of organic substances in clay Rocks on formation of a black core in ceramics", Glass and Ceramics 65, Nos. 3-4 (2008) 84   DOI   ScienceOn