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Int. J. Mol. Sci. 2012, 13(12), 16812-16821; doi:10.3390/ijms131216812

Phase Transformations of α-Alumina Made from Waste Aluminum via a Precipitation Technique

1,2,* , 1
Received: 27 August 2012 / Revised: 23 November 2012 / Accepted: 30 November 2012 / Published: 7 December 2012
(This article belongs to the Section Biochemistry, Molecular Biology and Biophysics)
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We report on a recycling project in which α-Al2O3 was produced from aluminum cans because no such work has been reported in literature. Heated aluminum cans were mixed with 8.0 M of H2SO4 solution to form an Al2(SO4)3 solution. The Al2(SO4)3 salt was contained in a white semi-liquid solution with excess H2SO4; some unreacted aluminum pieces were also present. The solution was filtered and mixed with ethanol in a ratio of 2:3, to form a white solid of Al2(SO4)3·18H2O. The Al2(SO4)3·18H2O was calcined in an electrical furnace for 3 h at temperatures of 400–1400 °C. The heating and cooling rates were 10 °C /min. XRD was used to investigate the phase changes at different temperatures and XRF was used to determine the elemental composition in the alumina produced. A series of different alumina compositions, made by repeated dehydration and desulfonation of the Al2(SO4)3·18H2O, is reported. All transitional alumina phases produced at low temperatures were converted to α-Al2O3 at high temperatures. The X-ray diffraction results indicated that the α-Al2O3 phase was realized when the calcination temperature was at 1200 °C or higher.
Keywords: precipitation; calcinations; phase transformations; α-alumina precipitation; calcinations; phase transformations; α-alumina
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Matori, K.A.; Wah, L.C.; Hashim, M.; Ismail, I.; Zaid, M.H.M. Phase Transformations of α-Alumina Made from Waste Aluminum via a Precipitation Technique. Int. J. Mol. Sci. 2012, 13, 16812-16821.

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