| 摘要 |
PURPOSE:To efficiently separate fine particles from a powder, by a method wherein the fine particle-containing powder is guided into a cylindrical container while accompanied by the first air steam forming a whirling stream and the second air stream forming a whirling stream in the direction reverse to that of the first air steam is introduced into said container. CONSTITUTION:A fine particle-containing powder being an object to be treated is guided into a cylindrical container from the first air introducing port 15 while accompanied by air and, at the same time, only air is introduced into said container from the second air introducing port 19. As a result, the fine particles in the powder are discharged from an air discharge port 11 while accompanied by air while the large particle powder from which the fine particles are removed falls in a powder recovery port 21. The first air stream 31 and second air stream 33 carrying the powder are reverse in a whirling direction and collide with the cylindrical container 17 and the powder accompanied by the first air stream is dispersed in the cylindrical container 17.
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