Electrostatic method of separating particulate materials
OwnerRoe-Hoan Yoon, Oh-Hyung Han +2inventors
InventorsRoe-Hoan Yoon, Oh-Hyung Han, Eric S. Yan, Byung-Wook Park
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Abstract
A method of separating particulate materials of different properties has been developed. It consists of feeding a mixture of dry, powdered materials to one end of the surface of a planar electrode, which is vibrating to move the particles forward. At least one type of the particulate materials acquires a charge via conduction or triboelectrification. Those particles that acquire charges of the same sign as that of the planar electrode are lifted and collected at the V-shaped counter electrodes installed above. The new separation method is particularly useful for removing unburned carbons from fly ash and any other conducting materials from nonconducting ones.
Claims17
An apparatus for separating particulate materials comprising:
- a) a planar electrode of generally rectangular shape
- b) a plurality of V-shaped counter electrodes located above the said planar electrode,
- c) a hopper to feed the said particulate materials in a layer to one end end of the said planar electrode,
- d) a vibrator to move the said particulate materials forward bouncing on the surface of the said particulate electrode repeatedly, and
- e) troughs interconnecting the V-shaped counter electrodes to collect the particulate materials levitated to the said counter electrodes.
A method of separating particulate materials of different properties comprising the steps of
- a) feeding the said particulate materials on to the surface of one end of a planar electrode, which is mechanically vibrated to move the said particulate materials forward,
- b) allowing the said particulate materials to be bounced repeatedly on the surface of the said planar electrode while they are moving forward, so that at least one type of the material present in the said particulate materials is strongly charged via conduction and/or triboelectrification mechanism(s), while the remainder is weakly charged
- c) subjecting the said particulate materials in an electric field created between the said planar electrode and a plurality of strips of counter electrodes installed above and in parallel to the said planar electrode,
- d) allowing the said strongly charged particulate material(s) to be lifted from the flowing film of the said particulate materials moving forward due to the electrostatic repulsion from the said planar electrodes and due to the electrostatic attraction from the said counter electrodes,
- e) collecting the said strongly charged particles lifted from the said planar electrode directly on the said counter electrodes, and
- thereby achieving a separation between the said strongly charged particles and the said weakly charged particles.
Dependencies are inferred from the claim text.