Method of an apparatus for sifting particulate material in a cro

Details Method of an apparatus for sifting particulate material in a cro Method of an apparatus for sifting particulate material in a cro

1977-06-28

1979-01-02

Lutter, Frank W.

Classifying, separating, and assorting solids

Fluid suspension

Gaseous

209138, 209144, 209145, B07B 400

Patent

active

041326342

ABSTRACT:
In a method and apparatus for sifting particulate material in a cross current, the method and apparatus being of the type wherein all particles of the same size are propelled transversely at the same velocity of at least approximately 5 m/sec and with the same direction in a thin layer into a high velocity sifting gas current so as to preclude a determinative influence of gravity, the particles spread out into the current and after a time of flight of the order of magnitude of 1/100 second separated into two or more fractions by one or more knife edges disposed in a direction opposite to the material trajectories without previously rebounding from any wall, and the incoming sifting gas flow subdivided into at least two parts which are led off separately, improved separation characteristics are obtained by establishing an additional partial flow which is led off in a direction different from the influx direction of the sifting gas current, the partial flow having a momentum component in a direction opposite to the direction in which material is propelled into the sifting gas current which has a value which is at least 1/10 that of the momentum of the current of material being propelled into the sifting gas current.

REFERENCES:
patent: 3006470 (1961-10-01), Franken
patent: 3311234 (1967-03-01), Rumpf et al.
patent: 3315806 (1967-04-01), Sigwart et al.
patent: 3520407 (1970-07-01), Rumpf et al.

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