Preparation of Alumina and Amorphous Silica from Clay Minerals

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J. Korean Ceram. Soc. > Volume 26(1); 1989 > Article

Journal of the Korean Ceramic Society 1989;26(1): 81.

점토광물로부터 알루미나 및 비정질 실리카 제조에 관한 연구

박희찬, 조원제¹, 강효경, 손명모²

부산대학교 무기재료공학과
¹부산대학교 고분자공학과
²대구공업전문대학 요업과

Preparation of Alumina and Amorphous Silica from Clay Minerals

ABSTRACT

High purity alumina and amorphous silica were prepared from Ha-dong kaolin by means of appliance of sulfuric acid. The effect of sulfuric acid concentration, reaction temperature and reaction time on the formation of aluminum sulfate was investigated. The precipitation conditions ofaluminum sulfate from the sulfuric acid solution with ethanol and ammonium hydroxide were deteremined. In the optimum condition, the conversion of aluminum oxide in kaolin to aluminum oxide powder was 85.0 percent. Alumina powder was prepared by calcination of the precipitates, and its purity was 99.0 percent.