세리사이드 분해에 의한 고순도 Al2O3의 제조 및 특성에 관한 연구

Fabrication and Characterization of High Purity Al2O3 by Decomposition of Selicite

  • 발행 : 1987.05.01

초록

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.

키워드

참고문헌

  1. 본지 v.17 no.1 고령토로 부터 알루미나 추출에 관한 연구 신병식;맹중재;김철주
  2. 본지 v.18 no.3 규산염 알루미나 광으로 부터 알루미나 추출에 관한 연구 신병식;맹중재
  3. 본지 v.19 no.2 카올린으로 부터 Al₂O₃용출에 관한 연구 백용혁;이종근
  4. 본지 v.16 no.1 국산 명반석과 황산염으로부터 고순도의 미세한 알루미나의 제조 및 특성에 관한 연구 변수일;이수영;김종희
  5. usp. 3890426 Method of Treating Alunite ore D. Stevens;H.O. Forberg
  6. 무기재료 원료공학 이종근
  7. 정량분석 신윤경
  8. 분석화학 주충열
  9. KSL-3120
  10. HB of Chem. and Phys R.C. Weast;M.J. Astle
  11. 단국대 논문집 v.2 국산 Alumite로 부터 Alum과 Aluminum Salfate 추출에 관한 연구 손선관
  12. Am. Ceram. Soc. Inc v.16 Alumina as a Ceramic Materials W. H. Gitzen
  13. ニユ一セラミック粉體ハソドブシク v.12 加藤 昭夫
  14. ASTM C20~74
  15. KSB 8086
  16. Raw Materials W.E. Worrall
  17. J. Am. Ceram. Soc. v.52 no.2 Kinetics and Mechnism of High-Temperature Reaction of Kaolinite Minerals J.F. Duncan;K.J.D. Mackenzie
  18. J. Am. Cerant. Soc. v.60 Structure Analysis of the transition phases in the Kaolinite-Mullite Thermal Sequence A.J. Leonard
  19. Alumina E. Dorre;H. Hubner
  20. USP. 3738411 Treatment of Aluminate Digester Liquor F.L. Tatabanya
  21. USP. 3681013 Extraction of Alumina from Bauxite W.M. Fish