Classifying – separating – and assorting solids – Electrostatic
Patent
1975-01-06
1976-05-11
Reeves, Robert B.
Classifying, separating, and assorting solids
Electrostatic
209 29, 209141, B07B 900
Patent
active
039556794
ABSTRACT:
Apparatus for and method of separating elongated articles having certain aerodynamic properties from a mixture containing contaminating particles of random shape is disclosed wherein a housing is diagonally divided into upper and lower chambers with a separation apparatus communicating between the chambers. The separation apparatus includes a funnel disposed within the upper chamber, a diffuser tube disposed within the lower chamber and a tubular neck connecting the funnel to the diffuser tube. A hopper is disposed above the funnel for dispensing the mixture to the funnel. A fluid, such as air, is forced into the lower chamber at a sufficient pressure to establish a predetermined flow rate through the diffuser tube and tubular neck to the base of the funnel. This flow rate is adequate to create a "fluidized bed" in the mixture, at the base of the funnel, permitting the articles and contaminating particles to move relative to each other. As a result, the elongated articles align themselves with the flow and, ultimately, present a sufficiently reduced cross section to the flow that they are no longer supported by the flow. Consequently, they fall through the diffuser tube to the lower chamber; whereas the randomly shaped contaminating particles are supported by the flow and are carried into the upper chamber by the flowing fluid.
REFERENCES:
patent: 1073451 (1913-09-01), Weaver
patent: 2311954 (1943-02-01), McLean
GTE Automatic Electric Laboratories Incorporated
Reeves Robert B.
Rolla Joseph J.
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