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J. Korean Ceram. Soc. > Volume 47(6); 2010 > Article
Journal of the Korean Ceramic Society 2010;47(6): 583.
doi: https://doi.org/10.4191/kcers.2010.47.6.583
발전소 매립회를 이용한 인공경량골재의 제조
김강덕, 김정환, 김유택, 강승구, 이기강
경기대학교 신소재공학과
Production of Lightweight Aggregates Using Power Plant Reclaimed Ash
Kang-Duk Kim, Jung-Hwan Kim, Yoo-Taek Kim, Seung-Gu Kang, Ki-Gang Lee
Department of Materials Engineering, Kyonggi University
In this paper, the properties of reclaimed ash(RA) from various domestic thermal power plants(S, D and H) were analyzed, and the possibility of fabricating the artificial lightweight aggregate(ALA) using RA was studied. The chemical compositions of RA are similar to the clay, but it had higher concentrations of alkali earth metal oxides(CaO, MgO) and unburned-carbon. The TCLP(Toxicity Characteristic Leaching Procedure) results showed that the dissolution concentrations of heavy metal ions of RA were below the limitation defined by the enforcement regulation of wastes management law in Korea. The results of IC analysis showed that leaching concentration of $Cl^-$ ion was 124 ppm for RA of HN and ${SO_4}^{2-}$ ion was leached a few hundreds ppm for all RA in this study. The ALAs with various mass ratio of clay to reclaimed ash(RA:Clay = 7:3, 6:4, 5:5, 4:6, 3:7) were sintered with a electric muffle furnace at the temperature of $1050{sim}1200^{circ}C$. The specific gravity and water absorption(%) of the sintered ALAs were 1.1~1.8 and 10~30% respectively. The ALA sintered in the rotary kiln at $1125^{circ}C$ showed a bulk density of 1.7 and water absorption of 15.2%.
Key words: Reclaimed ash, Lightweight aggregates, Bulk density, Water absorption
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