| 摘要 |
PCT No. PCT/GB89/00439 Sec. 371 Date Oct. 11, 1990 Sec. 102(e) Date Oct. 11, 1990 PCT Filed Apr. 25, 1989 PCT Pub. No. WO89/10197 PCT Pub. Date Nov. 2, 1989.A gravity separator for the separation of heavier particles from lighter waste material comprises a stack of decks (4) mounted for resonant oscillatory motion within a supporting frame (1). A motor (9) oscillates the decks at their resonant frequency while a distribution system (6) supplies a feed in the form of a slurry to the surface of the decks. As shaking continues, the heavier particles within the slurry are gradually separated from the lighter particles. Optimal separation is provided by a control system which, if necessary, automatically changes the amplitude of oscillation and/or the timing of the stages as separation proceeds, for example in response to outputs of detectors which measure the frequency of oscillation and the power being consumed.
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