Conveying and classifying of particulate substances

Details Conveying and classifying of particulate substances Conveying and classifying of particulate substances

1978-08-21

1980-05-20

Miles, Tim R.

Classifying, separating, and assorting solids

Fluid suspension

Gaseous

209159, B07B 408

Patent

active

042038332

ABSTRACT:
A method and an apparatus are disclosed for classifying particulate substances. A mix of heavier and lighter particles is confined between upwardly divergent side walls and a fluidizing gas is blown into the mix from below. A conveying conduit is arranged below the sidewalls and has vertical conduit portions which have upper open ends communicating with the space between the sidewalls. A classifying gas is blown through the conduit and the conduit portions at a pressure which is higher than that of the fluidizing gas to keep the lighter particles from entering the upper open ends, but which is sufficiently low so that the heavier particles can overcome the pressure of the classifying gas and drop through the upper open ends into the conveying conduit from which they are periodically expelled by bursts of a transporting gas.

REFERENCES:
patent: 3407929 (1968-10-01), Hoing
patent: 4049321 (1977-09-01), Bunting
patent: 4115929 (1978-09-01), Staub et al.

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