Classifying – separating – and assorting solids – Electrostatic – Free fall type particle charging
Patent
1997-10-27
1999-10-19
Terrell, William E.
Classifying, separating, and assorting solids
Electrostatic
Free fall type particle charging
209128, 209129, 209130, 2091271, B03C 700
Patent
active
059673311
ABSTRACT:
A free-fall separator apparatus for mixed particles. The apparatus includes a screw feeder for triboelectrically charging the particles, a feed hopper for releasing the tribocharged particles in a laminar flow path between a first electrode structure and a second electrode structure. The first electrode structure provides corona charging for the falling particles, and a substantially uniform electrostatic separation field is provided between the electrode structures for separating the falling particles. The electrode structures may each include a plurality of vertically extending string electrodes. Also provided is a method for sorting mixed particles which includes steps of charging the particles through contact electrification, releasing the mixed particles to fall freely in a substantially laminar stream, charging the particles electrically through corona discharge, and separating the particles through an electrostatic separation field.
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Katyshev Anatoly L.
Kukar Oleg B.
Sokolov Igor Yu.
Dillon, Jr. Joe
Terrell William E.
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