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Effects of preheating on mechanochemical amorphization and enhanced reactivity of aluminum hydroxide

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Preheating of gibbsite at 250°C brought about a phase transition to boehmite and an increase in the specific surface area as a consequence of partial dehydration. The preheated sample amorphizes completely by milling with a planetary ball mill for 2 h. Faster activation of preheated gibbsite is demonstrated by the integral heat of hydration, ΔHh, with Ca(OH)2 in an aqueous milieu. By using preheated gibbsite after milling for 1 h, ΔHh is almost the same as that by using gibbsite after milling for 3 h without preheating. Judging from ΔHh, continuous milling of gibbsite without cooling reduces the degree of activation down to 1/10. In contrast, no such reduction is observed when gibbsite is preheated.

Affiliations: 1: Inorganic Technology Group, Kyoto Research Laboratory, Sekisui Chemical Co., Ltd, 2-2 Kamichohi-cho, Kamitoba, Minami-ku, Kyoto 601-8105, Japan; 2: Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan


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