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J. Korean Ceram. Soc. > Volume 29(1); 1992 > Article
Journal of the Korean Ceramic Society 1992;29(1): 15.
Al2O3-SiO2 계 폐내화물을 이용한 재생캐스타블에 있어서 잔존수축의 제어
이상완, 김효준, 김의훈1
산업과학기술연구소 내화물연구실
Control of Permanent Shrinking of Recycled Castable Refractories from Waste Refractories of Al2O3-SiO2
The reason for permanent shrinking of recycled castable refractories from alumino-silicate waste refractories was investigated and the method to control shrinking is suggested in order to increase maximum service termperature. The porosity of castable refractories with waste material as large aggregate decreases after heat treatment because the porosity of waste refractories is greater than the of green material, in which CaO around large aggregate penetrates into aggregate and promotes liquid phase sintering. The shrinking of recycled castable refractories resulted in the decrease in porosity can be controled by addition of green kaolin chamotte as large aggregate. The shrinking of recycled castable refractories caused by the differences in densities of mineral phases before and after heat treatment can be controled by addition of kyanite. The use of green kaolin chamotte and kyanite increases the service temperature of recycled castable refractories up to 1500$^{circ}C$.
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