The Utilization of Yun Chun Andalusite as a Raw Material for High Alumina Refractories(III) -Effect of Impurities on the Mulltization-

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

Journal of the Korean Ceramic Society 1974;11(3): 27.

고 알루미나질 내화물 원료로서 연천산 홍주석의 이용에 관한 연구(III) -홍주석의 물라이트화에 미치는 불순물의 영향-

안영필, 최롱¹

한양대학교 요업공학과
¹한국과학기술정보센터 정보처리부

The Utilization of Yun Chun Andalusite as a Raw Material for High Alumina Refractories(III) -Effect of Impurities on the Mulltization-

ABSTRACT

The effect of impurities of andalusite on the morphology of the crystallization of mullite was investigated. The raw, concentrated and purified andalusite were fired at 145$0^{circ}C$. and 150$0^{circ}C$. Each of three grades of andalusite was examined in a scanning electron microscope, X-ray diffractometer and etc. The raw andalusite showed deeply etched textures and prismatic crystals which are estimated to be an average of 2.5u in width and 15u in length. Concentrated andalusite showed poorly formed and elongated prismatic crystals. Purified andalusite showed condensed needle-like crystals which are estimated to be an average of 0.4$mu$ in width and 2.0$mu$ in length, but at the boundary of the original andalusite grain, prismatic crystals were seen. It is supposed that the purified andalusite is able to utilize as a raw material for high alumina refractories with refractoriness S.K. 38.