A Study on the Development of Refractories for the Iron , Steel and Cement Manufacturing

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J. Korean Ceram. Soc. > Volume 17(2); 1980 > Article

Journal of the Korean Ceramic Society 1980;17(2): 96.

제철, 제강 및 시멘트 제조용 내화물의 개발에 관한 연구

김병호, 변재동¹

고려대학교 공과대학 재료공학과
¹고려대학교, 공과대학 재료공학과

A Study on the Development of Refractories for the Iron , Steel and Cement Manufacturing

ABSTRACT

The castable refractory, CaO.$2Al_2O_3$ is a useful alumina cement for iron, steel and cement for iron, steel and cement industries, however it is difficult to produce CaO.$2Al_2O_3$because of its high melting point(180$0^{circ}C$) and narrow firing range. In this study, the coprecipitation method was used to produce CaO.$2Al_2O_3$ for lower temperature firing . This method involved the titration of mixed solution of calicum and aluminate which extracted from domestic kaolin with $NH4_OH$ solution under blowing $CO_2$ gas into the solution. The coprecipitate and its clacined products were analyzed by X-ray diffraction and DTA. The calcined products fired between 400 and 90$0^{circ}C$ were amorphous, but at 100$0^{circ}C$ the coprecipitate was converted into one compound, CaO$2Al_2O_3$. From those experimental results, it was found that we could synthesizze CaO.$2Al_2O_3$ at about 100$0^{circ}C$ which is lower than conventional firing temperature by around 80$0^{circ}C$. The refractoriness of this alumina cement was SK 34 and the compressive strength ( 1 day) was about 250kg/$textrm{cm}^2$.