| 摘要 |
Apparatus for separating heavy particles of material from lighter particles, e.g. for separating impurities from powdery or fragmental material, such as fibres or chips, said apparatus comprising a carrier surface pervious to gas, onto which the material to be treated is supplied, as well as means for applying gas impacts through the carrier surface to the material to be treated. The apparatus comprises special valve elements disposed below the carrier surface to produce gas impacts.
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