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F. Ikazaki, K. Kamiya, K. Uchida, A. Kawai, A. Gotoh, and E. Akiba
[Proc. of the 1st Intern'l Conf. on Mechanochem. Vol. 2, pp. 140-143, 1993]
Chemically Assisted Dry Comminution(CADC) of mixed inorganic powder was conducted in order to prepare ultra-fine powder with least contamination from grinding media. CADC of mixed powder is a comminution method in which powder A to be ground is first mixed with powder B and the mixed powders are comminuted in dry condition, followed by obtaining fine powder A after removing powder B by use of an easy method such as dissolution. "Assisted" means that powder B assists comminuting powder A by some interaction with powder A during the comminution. Lithium nitrate was used as powder B. The CADC successfully prepared finer and flakier sericite powder with less contamination than an ordinary dry comminution (Fig.1). Potassium ion in sericite was exchanged for lithium ion in lithium nitrate during the comminution. The ion-exchange was considered to help sericite to be efficiently comminuted.
