Aluminum nitrate nonahydrate → Aluminum nitrate

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An aluminum nitrate nonahydrate (Al(NO3)3.9H2O) (made by Kansai Catalyst Co., Ltd., an extrapurereagent, powder) 750.26 g (2 mol) was dissolved in pure water 1,555.7 g to give a 1 mol/liter aqueous aluminum nitrate solution. To the resulting aqueous aluminum nitrate solution was added 218.6 g of the aqueous mixture including 43.7 g of the ground α-alumina particles, to which a 25% aqueous ammonia (made by Wako Pure Chemical Industries, Ltd., a guaranteed reagent) 328 g (ammonia: 82 g) was added at a feed rate of about 32 g/minute through a microrotary pump, while the mixture was stirred at room temperature (about 25° C.). When the addition was completed, the hydrolyzed product was precipitated in the state of a slurry, which had a pH of 3.8. After the addition was completed, the slurry was kept to stand at room temperature (about 25° C.) for several decades minutes to turn into a jelly. The resulting jelly was dried in a thermostatic chamber having a temperature of 60° C. for one day, and dried jelly was ground in an alumina mortar to give a powdery mixture. The resulting mixture comprised 30 parts by mass of seed crystal particles based on 100 parts by mass of the metal components in terms of the oxides.

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