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J. Korean Ceram. Soc. > Volume 40(5); 2003 > Article
Journal of the Korean Ceramic Society 2003;40(5): 494.
doi: https://doi.org/10.4191/kcers.2003.40.5.494
Clay-EAF Dust계 소지의 소결온도 범위에 미치는 Al2O3의 영향
김광수, 강승구, 이기강, 김유택, 김영진, 김정환
경기대학교 첨단산업공학부 신소재공학전공
The Effect of Al2O3 upon Firing Range of Clay-EAF Dust System Body
ABSTRACT
The effects of $Al_2$O$_3$ addition upon the sintering range of clay-EAF dust (the specified wastes produced from steel making process) system body which would be used as a constructing bricks were investigated. The slope of apparent density to sintering temperature decreased for Clay-dust body containing 5~15 wt% A1203 sintered at 1200-125$0^{circ}C$, and the absorption(%) of specimen sintered above 125$0^{circ}C$ decreased due to the formation of open pores produced by pore bloating. For the specimen without any $Al_2$O$_3$ addition sintered at 1275$^{circ}C$, the major phase was cristobalite, the small amount of mullite (3Al$_2$O$_3$ 2SiO$_2$) formed and the hematite (Fe$_2$O$_3$) remained. In the Clay-dust system body containing $Al_2$O$_3$ 15 wt%, however, the cristobalite disappeared and the major phase was mullite. Also the part of $Al_2$O$_3$ reacted with hematite to form hercynite (FeAl$_2$O$_4$). From the these results, addition of $Al_2$O$_3$ to Clay-dust system body enlarges a sintering range; decreasing an apparent density and absorption slop to sintering temperature owing to consumption of liquid phase SiO$_2$ at higher temperature and gas-forming component Fe$_2$O$_3$ at reduced atmosphere which would decrease an amount of liquid formed and increase the viscosity of the liquid produced during the sintering process.
Key words: EAF dust, Sintering range, $Al_2$$O_3$, Apparent density, Flux, Mullite, Hematite
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