| 摘要 |
An apparatus for separating a mixture of particulate materials of different densities comprising means for causing the mixture of material to flow in a circular path and means for generating a substantially radially inward air flow through said path. The circular path may be formed by an air-permeable surface of circular cross-section, for example, cylindrical or frusto-conical, and the means for generating the radially inward air flow may be an annular chamber surrounding said surface in communication with a source of compressed air.
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