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http://dx.doi.org/10.4191/KCERS.2002.39.3.259

Sintering Properties of Artifical Lightweight Aggregate Prepared from Coal Ash and Limestone  

Kim, Do-Su (Recycling Research Center, Korea Institute of Geoscience and Mineral Resources)
Lee, Churl-Kyoung (Recycling Research Center, Korea Institute of Geoscience and Mineral Resources)
Park, Jong-Hyeon (Dangjin Thermal Power Plant, Korea East-West Power General Company)
Publication Information
Journal of the Korean Ceramic Society / v.39, no.3, 2002 , pp. 259-264 More about this Journal
Abstract
In this study, sintering properties of Artificial Lightweight aggregates(ALAs) prepared from coal ash as a function of sintering temperature (900$^{\circ}$C, 1000$^{\circ}$C, 1100$^{\circ}$C) and time (2min, 5min, 10min) when limestone added as lightweight mineral was investigated. Increasing the sintering temperature resulted simultaneously from a decline of quartz mineral as well as growth of mullite mineral. Addition of limestone to ALAs newly formed sintered minerals such as clinoptilolite and plagioclase. Sintering effect of ALAs prepared from coal ash and limestone was more affected by a sintering temperature than time. As sintering temperature and time increae, transition of macropore to micropore and formation of closed pores were happened, consequently shrank the total pore volume of ALAs. The surface of ALAs sintered at 1000$^{\circ}$C for 5min was nearly not detected open pores due toe amalgamation effect of molten slag layer but homogeneous distributions of closed pores with micro-scale were examined in cross sectional area ALAs. Sintering temperature and time which present the most adequate state, in the preparation of ALAs, are corresponded to 1000$^{\circ}$C and 5min, respectively.
Keywords
Sintering properties; Artificial lightweight aggregate; Coal ash; Limestone;
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