Solid material comminution or disintegration – Processes – With classifying or separating of material
Patent
1982-04-09
1985-10-01
Goldberg, Howard N.
Solid material comminution or disintegration
Processes
With classifying or separating of material
241 76, B02C 2314, B02C 2316
Patent
active
045441022
ABSTRACT:
Disclosed are differential rate screening processes and apparatuses for continuously screening undersize particles in different size classes to different degrees of incompletion to provide a product having a preselected distribution of particle sizes substantially different from the distribution of particle sizes in a feed of particulate material. A stream of feed is introduced onto a screening member having apertures of sufficient size to pass a plurality of size classes, and is separated into at least a throughs stream and one other stream by causing undersize classes to pass through screen apertures and into a throughs stream in proportions relative to one another substantially different from the proportions of the same undersize classes relative to one another in the feed stream. A sufficient population of undersize particles are provided in each undersize class and differentials between relative proportions of undersize classes in the feed stream and relative proportions of undersize classes in the throughs stream are controlled so as to provide a product having substantially the desired particle size distribution. Various means are provided for causing differentials between relative proportions of undersize classes in the feed and relative proportions of undersize classes passing through the screening member and into the throughs stream, and for controlling these differentials.
REFERENCES:
patent: 2617532 (1952-11-01), Gorton
patent: 3016203 (1962-01-01), Sears et al.
patent: 3409235 (1968-11-01), Quinn
Hahn William F.
McAdams Hiramie T.
Eley Timothy V.
Goldberg Howard N.
Penn Virginia Corporation
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