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J. Korean Ceram. Soc. > Volume 24(5); 1987 > Article
Journal of the Korean Ceramic Society 1987;24(5): 431.
세리사이드 분해에 의한 고순도 Al2O3의 제조 및 특성에 관한 연구
이경희, 박한수1, 송명신1
명지대학교 무기재료공학과
1홍익공전 요업과
Fabrication and Characterization of High Purity Al2O3 by Decomposition of Selicite
High purity Al2O3 has been extracted from serlcite of clayminerals, selicite was treated by H2SO4(2N∼18N) solution, NH4OH treatment(PH8.5∼10.0) and metallic impurities such as Fe were removed by NaOH treatment. The tendency of extraction yield of ${alpha}$-Al2O3 have been investigated by relating reaction time, acid concentration. Reaction products were analyzed by DT-TGA, chemical analysis and X-ray diffractometer. Prepared ${alpha}$-Al2O3 power is fired in air at 1400$^{circ}C$, 1600$^{circ}C$ 2hr. The results are as follows; 1. The most suitable extracting conditions of ${alpha}$-Al2O3 from Selicite were N-H2SO4, 120 min acidtreating time. 2. The optimum pH condition was 9.0. 3. Physical properties of sintered Al2O3 bodies were as follows. Relative density is 99%. Water absorption is 0.26%. Rock well hardness is 89.
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