(A) ;N-(ARYLOXYALKYL)HETEROARYL-8-AZABICYCLO- (3,2,1)OCTANE, INTERMEDIATE, AND PREPARATION THEREOF

摘要

PURPOSE:To obtain ferrite powder having small number of pore and able to give high density polycrystalline ferrite in low cost by pulverizing calcined ferrite in oxidizing state in calcining ferrite raw material and producing ferrite powder with pulverizing the calcined material. CONSTITUTION:Ferrite raw material composed of Fe2O3, MnO and ZnO, etc., is pulverized and calcined by ordinary method, then received in a vessel 1 of pulverizer together with water and many balls 2. Next, the calcined material is pulverized by revolving vessel 1 with supplying a gas containing oxygen from gas introducing port 3 to obtain ferrite powder. Polycrystalline ferrite having low pore fraction, high density and long growing length of single crystal ferrite is obtained by producing polycrystalline ferrite using resultant ferrite powder. Besides, H2O2 may be supplied into slurry of the calcined material instead of introducing oxygen-containing gas into the pulverizer vessel 1.