| 摘要 |
PROBLEM TO BE SOLVED: To provide a classification method for efficiently classifying foreign matter and soil from a large amount of polluted soil containing foreign matter with good classifying accuracy. SOLUTION: The classification method has the first process of classifying polluted soil into classified matter mainly comprising foreign matter and soil by a wind-force classification apparatus and the second process of further classifying the classified matter mainly comprising foreign matter by the wind-force classification apparatus. The second process is performed at least once until desired classifying accuracy is obtained. The wind-force classifying apparatus is equipped with a charging hopper in which polluted soil is charged, a feeder for feeding and charging the soil into air streams from the charging hopper and a jet nozzle for generating air streams for classifying foreign matter from the soil. The feeder is excited in an obliquely upward direction with respect to the soil charging direction. The jet nozzle is preferably a flat nozzle and arranged in every process, preferably subjected to cascade arrangement to eject air streams in a horizontal or obliquely upward direction from the area below the leading end part of the feeder. COPYRIGHT: (C)2004,JPO
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