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J. Korean Ceram. Soc. > Volume 19(2); 1982 > Article
Journal of the Korean Ceramic Society 1982;19(2): 157.
카오린으로부터 $Al_2O_3$의 용출에 관한 연구
백용혁, 이종근
한양대 무기재료공학과
A Study on the Extraction of Alumina from Kaolin
ABSTRACT
The possibility of extraction of alumina from domestic Ha-dong kaolin was studied by sulfuric acid treatment. Raw kaolin was calcined at various temperature (500-110$0^{circ}C$) and calcined kaolin were treated with sulfuric acid. The tendency of extraction yield of alpha alumina have been investigated by relating reaction time, temperature, and acid concentration. After reaction, precipitates were analyzed by DTA, TGA, and identified alpha alumina by X-ray diffractometer with calcined sample at 120$0^{circ}C$. The results were as follows; 1. The optimum calcination temperature was 800-86$0^{circ}C$. 2. The most suitable extracting conditions of alpha alumina were 40 wt%-$H_2SO_4$, 2-3 hours acid-treating time and 8$0^{circ}C$ acid-treating temperature. 3. Precipitates were composed of $(NH_4)_2SO_4$, $Al_2SO_4(OH)_4$ 5-7 $H_2O$ and $Al(OH)_3$
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