Classifying – separating – and assorting solids – Stratifiers – With liquid treatment
Patent
1990-12-20
1992-05-19
Hajec, Donald T.
Classifying, separating, and assorting solids
Stratifiers
With liquid treatment
209 44, 209453, B03B 512
Patent
active
051145693
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND ART
This invention relates to centrifugal jigs of the general type described in Australian Patent No. 573,960, in which a feed slurry is introduced into a rotating chamber bounded radially by a screen provided with ragging on its inner surface, the ragging being dilated repetitively to provide jigging action. The jig separates the materials in the feed slurry on the basis of differing specific gravities.
Centrifugal jigs according to Australian Patent No. 573,960 have proven to be highly effective, and are capable of separating materials having a specific gravity difference as low as 0.4. However, these jigs have been mainly restricted to relatively small units. Practical difficulties prevent this jig design being used for large scale jigs. In particular, the forces needed to overcome the hydrostatic pressure and pulse the water in a large hutch region would interfere with the balanced running of a large scale jig.
DISCLOSURE OF INVENTION
The present invention seeks to obviate the abovementioned difficulties by providing a centrifugal jig in which large throughputs of material can be obtained, with an efficient mechanism for dilating the ragging.
The present invention therefore provides a centrifugal jig comprising a container mounted for rotation about its longitudinal axis, the container comprising an axial region, a peripheral region comprising at least one hutch chamber separated from the axial region by ragging, means for introducing feed material to the axial region and dilating means for repetitively dilating the ragging in a circumferential sequence while the container rotates.
Preferably, the vector sum of the radial forces acting on the dilating means due to hydrostatic pressure of fluid within the hutch chambers is zero, thus providing a jig in which the hydrostatic pressures are balanced.
The peripheral region may comprise a plurality of hutch chambers each separated from the axial region by ragging and the dilating means may comprise pulsating means associated with each hutch chamber for pulsating the fluid in the respective hutch chamber.
More preferably, the hutch chambers are circumferentially spaced about the longitudinal axis in diametrically opposed pairs and, in use, the force acting on the pulsating means due to hydrostatic pressure of fluid in a hutch chamber is counter-balanced by an equal and opposite force on the pulsating means due to hydrostatic pressure of fluid in the diametrically opposed hutch chamber. The pulsating means may sequentially pulsate the fluid in circumferentially successive hutch chambers, and may simultaneously increase the pressure of fluid in a hutch chamber and decrease the pressure of fluid in the diametrically opposed hutch chamber.
An alternative means for sequentially dilating the ragging comprises providing separate screen portions corresponding to each hutch chamber, the screen portions being reciprocated while the container rotates. A further alternative means for sequentially dilating the ragging comprises mounting the screen eccentrically to the longitudinal axis of the container.
To allow continuous throughput of material, the jig may have concentrate outlet means communicating with the radially outermost portion of each of the hutch chambers and concentrate launder means communicating with the concentrate outlet means. The jig may also have a flange extending radially inwardly from the upper edge of the screen and tailing launder means communicating with the region above and radially inward of the flange.
The pulsating means for each hutch chamber preferably comprises a diaphragm actuated by reciprocating drive means. The reciprocating drive means may comprise a pushrod associated with each of the diaphragms and crank means for reciprocating each of the pushrods.
Preferred embodiments of the present invention shall now be described with reference to the accompanying drawings:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a simplified sectional elevation of a centrifugal jig according to one embodiment of the present invention;
FIG.
REFERENCES:
patent: 4056464 (1977-11-01), Cross
patent: 4071440 (1978-01-01), Jedo et al.
patent: 4279741 (1981-07-01), Campbell
patent: 4454041 (1984-06-01), Kelsey
patent: 4574046 (1986-03-01), Sprow
patent: 4898666 (1990-02-01), Kelsey
patent: 4998986 (1991-05-01), Campbell
Hajec Donald T.
Lowan (Management) Pty. Limited
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