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KMID : 1059519910350030275
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Journal of the Korean Chemical Society
1991 Volume.35 No. 3 p.275 ~ p.279
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A Study on the Synthesis of High-Purity α-Al2O3 Ultra-Fine Powders by Wet Chemical Method
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Choy Jin-Ho
Yoo Jong-Seok
Han Yang-Su
Kim Joon
Lee Hyeon-Kook
Kim Hyuk-Nyun
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Abstract
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Ultra-fine alumina, α-Al2O3, with φ = 0.1∼0.5 μm was obtained from pure ammonium aluminum sulfate(alum) as the thermal decomposition product. Pure alum(> 99.7%) could be prepared by the precepitation and the successive recrystallization in an acidic aqueous solution at pH = 1.5∼2.5, which was theoretically predicted by only considering the concentrations of hydroxide and carbonate for aluminum and sodium in the solution, and also experimentally confirmed as the optimum precepitation condition for alum without forming any impurities like aluminum hydroxide or sodium one.
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