Synthesis of high-purity α-Al2O3 from boehmite by high temperature vacuum treatment
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
In this study a simple and environmentally benign method for conversion of technical purity Al into high-purity alumina isdescribed. The method is based on hydrothermal oxidation of aluminium and subsequent high temperature purification ofaluminium oxide. Deep purification is achieved by high-temperature vacuum treatment of aluminium oxide at temperatureof 1600-1750 oC. Structure and chemical composition of reaction products obtained at experimental conditions at differentsteps of method are examined in presented work. It has been shown that by proposed method the Al powder of technical purity(99.8 wt.%) can be converted into high-purity alumina (99.997 wt.%). Molecular mechanics simulation of impuritiessegregation to the (0001) surface of alumina crystal has been carried out. The simulation revealed a correlation between thestrength of segregation and the efficiency of impurities removal from alumina during high-temperature vacuum treatment.
Abstract
In this study a simple and environmentally benign method for conversion of technical purity Al into high-purity alumina isdescribed. The method is based on hydrothermal oxidation of aluminium and subsequent high temperature purification ofaluminium oxide. Deep purification is achieved by high-temperature vacuum treatment of aluminium oxide at temperatureof 1600-1750 oC. Structure and chemical composition of reaction products obtained at experimental conditions at differentsteps of method are examined in presented work. It has been shown that by proposed method the Al powder of technical purity(99.8 wt.%) can be converted into high-purity alumina (99.997 wt.%). Molecular mechanics simulation of impuritiessegregation to the (0001) surface of alumina crystal has been carried out. The simulation revealed a correlation between thestrength of segregation and the efficiency of impurities removal from alumina during high-temperature vacuum treatment.
참고문헌 (20)
- M. Côt, , Proc. ORBIT 2012, pp.1~ (2012)
- E. E. Grinberg, , Russian Journal of Applied Chemistry, 75, pp.245~247 (2002)
- Khos-Erdene Khishigbayar, "Impurity control with the precise measurement of alumina powders synthesized by hydrolysis method", Journal of Ceramic Processing Research, 14(2), pp.168~171 (2013), 세라믹공정연구센터[DOI]
- O. Mekasuwandumrong, , Inorganic Chemistry Communications, 6, pp.930~934 (2003)
- B. Pacewska, , Thermochimica Acta, 385(1-2), pp.73~80 (2002)
- S. Fujiwara, , Sumiotomo Kagaku, pp.1~10 (2007)
- K. Byrappa, "Handbook of Hydrothermal Technology" (2001), William Andrew Publishing
- E. I. Shkolnikov, , The Journal of Supercritical Fluids, 73, pp.10~17 (2013)
- M. S. Vlaskin, , International Journal of Hydrogen Energy, 36, pp.6484~6495 (2011)
- M. S. Vlaskin, , Journal of Power Sources, 196, pp.8828~8835 (2011)
- E.I. Shkolnikov, "Ru patent 2519450 2014", ~ (2014)
- S. Brunauer, , Journal of the American Chemical Society, 60, pp.309~319 (1938)
- S. A. Kislenko, , Solid State Ionics, 293, pp.1~6 (2016)
- M. P. Seah, , Philosophical Magazine, 31, pp.627~645 (1975)
- K. J. W. Atkinson, , Journal of the European Ceramic Society, 23, pp.3059~3070 (2003)
- D. J. Cooke, , Phys Chem Minerals, 31, pp.507~517 (2004)
- M. A. Gülgün, , Interface Science, 10, pp.99~110 (2002)
- C. Floss, , Geochimica et Cosmochimica Acta, 60, pp.1975~1997 (1996)
- B. A. Cohen, , Geochimica et Cosmochimica Acta, 68, pp.1661~1675 (2004)
- S. K. Roy, , Journal of the American Ceramic Society, 51, pp.1~6 (1968)