PRODUCTION OF HIGHLY PACKABLE CARBONACEOUS POWDER

摘要

PROBLEM TO BE SOLVED: To obtain compact carbonaceous powder excellent in packability by imparting a dynamic energy to carbonaceous powder to specify an apparent density ratio and a median diameter ratio between the non-treated powder and the treated powder. SOLUTION: Carbonaceous powder having an interlayer distance (d002 ) of <=0.345 nm and a crystallite size of >=10 nm is charged into a mixing device and ground by the application of a dynamic energy so as to give an apparent density ratio of >=1.1 and a median diameter ratio of >=1 between the non-treated powder and the treated powder. Thus, the highly packable carbonaceous powder having a median diameter of 5-50 μm and a BET method specific surface area of <=25 m<2> /g is obtained. The mixing device has a shaft and plural plow-like or saw tooth-like paddles fixed to the shaft in the device. The paddles form plural treating chambers in various phases. The inner wall surface of the device is formed in a cylindrical shape along the outermost line of the rotation of the paddles, and the space between the inner wall surface and the outermost line is minimized. The plural paddles are disposed on the shaft in its axial direction. One or plural screw type crushing blades capable of being rotated at a high rotation rate are disposed in one or many stages on the inner wall surface.