Classifying – separating – and assorting solids – Electrostatic
Patent
1983-11-15
1985-12-03
Metz, Andrew H.
Classifying, separating, and assorting solids
Electrostatic
209214, B03C 704
Patent
active
045564817
ABSTRACT:
Particles having different properties (e.g. particulate fly ash and carbon) are separated by moving the particles forwards along a horizontal, gas-permeable electrode plate (1) above which is mounted a second electrode (2) having at least one plate (4) mounted at an acute angle (.alpha.) to the horizontal. Preferably, two plates (4) each extend sideways from a central block (3) of dielectric material. The particles are fluidized, continuously or intermittently, by a gas stream passed upwards through the plate (1), which may be of sintered metal. An alternating electric field is generated between the electrodes (1, 2) by a high voltage AC power source (14). The field lines (16) from each plate (4) curve to the side and impart centrifugal forces to particles charged by friction or conductive induction, which forces separate the lighter, more highly charged particles from the others. The particles may be moved by means of a vibratory transducer (12). Alternatively, the gas-permeable plate may slope downwards in the forward direction allowing the fluidized particles to move in that direction under the force of gravity. The separated particles are collected in bins (13) arranged around the lower electrode (1).
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Blue Circle Industries PLC
Chapman Terryence
Metz Andrew H.
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