| 摘要 |
A first stage chamber (10) has upwardly diverging walls (12a and 12b) to let an upward airstream passing through. When particles are fed homogeneously at the top chamber (10), they reach equilibrium at different heights depending on their weights. The particles suspended and classified at different heights are conveyed by a horizontal airstream in parallel horizontal channels (41) toward a chamber side wall (12b) where they are removed. Ribbed sections (44) adjacent to the channels (41) divide the chamber into deviating pathways to homogenize the spread of particles in the chamber. Light trash is removed through the top toward a cyclone (33). Heavy particles are removed at the chamber bottom. A second stage (70) received the particles from the first stage chamber (10) and performs a further classification by ballistically projecting the particles into one of two groups.
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