Reaktion #1056431

Reaktionsgleichung

aluminum nitrate hydrate

→

aluminum nitrate

Lösungsmittel

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigegiving a total volume of 1000 cm3

Vorschrift

375.13 g of aluminum nitrate hydrate [Al(NO3)3·9H2O, manufactured by Wako Pure Chemical Industries Ltd., guaranteed reagent] was dissolved in pure water, giving a total volume of 1000 cm3, to obtain 1155 g of an aluminum nitrate aqueous solution. To 250 cm3 of this aluminum nitrate aqueous solution was added 27.32 g of the seed crystal slurry obtained by the same operation as in Example 1 [Preparation of seed crystal slurry], then, 40 g of 25% ammonia water [manufactured by Wako Pure Chemical Industries Ltd., guaranteed reagent] was added at a feeding rate of 2 g/minute by using a micro rotary pump while stirring at 25° C. In completion of addition, slurry of pH 4.1 containing a hydrolysate of aluminum nitrate was obtained. This slurry was maintained at 25° C. for 24 hours, then, dried at 20° C. by using pressure-reduced drier, to obtain a dry powder. This powder contained a hydrolysate and 30 wt % of seed crystal (α-alumina) in terms of Al2O3. This powder was ground by using a mortar, then, charged into an alumina crucible. The alumina crucible was placed in a box-type electric furnace. The powder was heated up to 940° C. at a rate of 300° C./h in air, and calcined at 940° C. for 3 hours, to obtain an α-alumina particulate. The properties of this α-alumina particulate are shown in Table 1. The photograph of the α-alumina particulate is shown in FIG. 3.

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