| 摘要 |
At least two separate zones in the bottom of a mixing chamber are supplied alternately with finely divided streams of agitating air, and fine material to be treated is supplied at alternate points in the top of the chamber, each of such points being located above one of such separate zones. The fine material is withdrawn at the bottom of the chamber. The point at which fine material is supplied is always a point at which the fine material in the chamber is relatively quiet, located above a zone in which the agitation of the material by air is relatively slight.
|
