Chemically Assisted Dry Comminution of an Inorganic Powder

F. Ikazaki, K. Uchida, K. Kamiya, A. Kawai, S. Yoda,
and A. Gotoh
[Adv. Powder Technol., Vol. 7, No. 2, pp. 111-120, 1996]

Chemically assisted dry comminution(CADC) of an inorganic powder was conducted in order to obtain fine powder with large specific surface area. Soda glass powder was comminuted with lithium nitrate in a dry condition. The interaction of lithium nitrate with soda glass powder during the comminution assisted the soda glass powder in being comminuted. The soda glass powder of ca. 180 m²/g was prepared by CADC, as shown in Fig. 1, whereas the specific surface area in an ordinary dry comminution of the soda glass powder was only 3.8 m²/g. Zirconia content as a contaminant was lower in CADC than in an ordinary dry comminution. The prevention of agglomeration of the comminuted soda glass by lithium nitrate and the ion-exchange between lithium and sodium ions in the soda glass powder during CADC were thought to help the comminution.