Classifying – separating – and assorting solids – Precedent preparation of items or materials to facilitate...
Reexamination Certificate
1999-06-11
2001-08-07
Nguyen, Tuan N. (Department: 3653)
Classifying, separating, and assorting solids
Precedent preparation of items or materials to facilitate...
C209S005000, C209S017000, C209S214000, C209S590000
Reexamination Certificate
active
06269952
ABSTRACT:
This invention relates to methods and apparatus for use in processing and treating particulate material.
A process to be described below may be used, for example, to produce particulate material of required dimensions, and in the recovery of specific materials, for example, metals. A further method to be described below is concerned with coating particulate material.
In a particular arrangement to be described below, as an example, material contained in a slurry pulp is subjected to vibrations at ultrasonic frequencies and then given a centrifugal treatment in a cyclone in order to enable particles of a required size to be separated out. A magnetic separator may be used to separate out magnetisable materials.
In the specification of European patent application number 87306243.4, which was published under number 259959 on Mar. 16, 1998, a process and an apparatus were described for treating a flowing slurry of particulate material in a liquid. A plurality of ultrasonic transducers were mounted on the underside of a tray having upturned edges and the tray was suspended by cables to facilitate vibratory flexing and undulation. Slurry flowing lengthwise down the tray was treated to a “microscopic scrubbing” by ultrasonic vibrations coupled through the tray .
In the specification of European patent application number 9111504.2, which was published under number 528070 on Feb. 24, 1993, a method and apparatus for preparing pourable bulk goods was described in which the bulk goods were all owed t o fall into a first tank where they were washed by a liquid directed at them through nozzles to detach dirt particles. They were then cleaned and separated in a second tank; the cleaned goods being dried and given thermal treatment by being passed through a pipeline system which was heated on its outside and could be rotated.
The specification of French patent application number 7601726, which was published under number 2,338,745 on Aug. 19, 1977, disclosed a method and device for subjecting a mixture of sand and water to irradiation by ultrasonic waves from rotating transducers which were plunged into the water-sand mixture whilst water was forced upwards through the mixture.
In the specification of Japanese patent application number 2,068,581, which was published under number 3,270,777 on Dec. 2, 1991, there was proposed a method for treating fly ash containing a toxic substance in which an ultrasonic wave was applied to fly ash suspended in water to separate the toxic materials and an ozone containing gas was bubbled through the suspension to decompose the toxic substance.
The removal of SO
4
from a coal ash slurry was proposed in the specification of Japanese patent application number 870,061,344 which was published under number 63229189 on Sep. 26, 1988. The specification proposed that a coal ash and water slurry be treated by ultrasonic waves to separate water containing SO
4
and desulphurised coal ash.
Arrangements illustrative of the invention will now be described, by way of example, with reference to
FIGS. 1
to
9
of the accompanying drawings which show in block schematic diagrammatic form various arrangements of apparatus and their method of operation.
REFERENCES:
patent: 4401437 (1983-08-01), Poetschke et al.
patent: 4712742 (1987-12-01), Ogawa et al.
patent: 4778594 (1988-10-01), Doctor
patent: 4938864 (1990-07-01), Frazier et al.
patent: 5887724 (1999-03-01), Weyand et al.
patent: 259959A (1988-03-01), None
patent: 528070 (1993-02-01), None
patent: 2338745 (1977-08-01), None
Nellmapius John Hugo
Watt John H.
Earth Sciences Limited
Lowe Hauptman & Gilman & Berner LLP
Nguyen Tuan N.
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