Utilization of Alunite to Ceramic Raw Materials (III)

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J. Korean Ceram. Soc. > Volume 11(3); 1974 > Article

Journal of the Korean Ceramic Society 1974;11(3): 33.

요업원료로서 명반석의 이용에 관한 연구(제III보) Mullite질내화재원료로의 이용

백용혁, 최상흘¹

전남대학교 요업공학과
¹한양대학교 요업공학과

Utilization of Alunite to Ceramic Raw Materials (III)

ABSTRACT

The possibility of the sources for the manufacture of mullite-rich refractories from the modified domestic alunite was studied. The modifying method of alunite studied were performed by calcination, wet ballmilling, and washing with water. For synthesis of mullite-rich refractories, the modified alunite with the addition of alumina and Fe2O3 as mineralizer was fired at 1350$^{circ}$-155$0^{circ}C$, and the following results were obtained: 1) The suitable firing temperature range was 1450$^{circ}$-150$0^{circ}C$, and adequate amounts of Al2O3 and Fe2O3 were below 30% and 3~4%, respectively. 2) Thermal expansion coefficient proportional to heating temperature was about 5$times$10-6~10$times$10-6cm/cm.deg. 3) The mineralogical compositions of the sintered specimens were found as mainly mullite and corundum.