| 摘要 |
PROBLEM TO BE SOLVED: To provide a production method of fine powder effectively producing fine powder without forming aggregation in a crushing chamber of a jet mill crushing apparatus and capable of reducing stress applied to crystals of fine particles, and fine powder with a little stress and uniform particle diameters. SOLUTION: An inert gas is jetted to coarse powder introduced inside the crush chamber 14a of a crusher 14 from a plurality of jet nozzles 14b at high speed, and the coarse powder is put on a jet stream. When the coarse powder is mutually collided to be crushed and finely powdered, elastic blocks 17 are previously filled in the lower part of the crushing chamber 14a. The coarse powder is crushed in a state that the coarse powder and the elastic blocks 17 are coexistent. COPYRIGHT: (C)2004,JPO&NCIPI
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