(19)
(11) EP 0 492 924 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.01.1993 Bulletin 1993/04

(43) Date of publication A2:
01.07.1992 Bulletin 1992/27

(21) Application number: 91311670.3

(22) Date of filing: 16.12.1991
(51) International Patent Classification (IPC)5B03B 4/00, B07B 4/08, A24B 1/04
(84) Designated Contracting States:
BE CH DE DK ES FR GB GR IT LI LU NL

(30) Priority: 20.12.1990 GB 9027714

(71) Applicant: ROTHMANS INTERNATIONAL SERVICES LIMITED
London W1X 7FB (GB)

(72) Inventor:
  • Parker, Michael Patrick
    Leighton Buzzard, Bedfordshire, LU7 8BL (GB)

(74) Representative: Harrison, David Christopher et al
MEWBURN ELLIS York House 23 Kingsway
London WC2B 6HP
London WC2B 6HP (GB)


(56) References cited: : 
   
       


    (54) Method and apparatus for separation of heavy and light particles from particulate material


    (57) Apparatus for the separation of heavy and light particles from particulate material which includes means for fluidising and agitating the material to cause heavy particles to sink from the acceptable material and comprising a deck adapted to receive material at a reception end and means for vibrating said deck to cause the material to move longitudinally along it to a discharge end, said deck having a number of longitudinally extending troughs separated by peaks and providing an upwardly directed air flow in the troughs characterised by control means for causing the velocity of the upwardly directed fluidising air in each trough to initially increase to a point below the peaks and to then continue upwards at a reducing velocity.







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