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

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

1,2,* , 1
,
1,2
,
2
 and
1
1 Department of Physics, Faculty of Science, Universiti Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia 2 Materials Synthesis and Characterization Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia
* Author to whom correspondence should be addressed.
Received: 27 August 2012 / Revised: 23 November 2012 / Accepted: 30 November 2012 / Published: 7 December 2012
(This article belongs to the Section Material Sciences and Nanotechnology)
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Abstract

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 (CC BY 3.0).
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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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