Classifying – separating – and assorting solids – Stratifiers – With liquid treatment
Patent
1986-09-22
1990-02-06
Cherry,, Johnny
Classifying, separating, and assorting solids
Stratifiers
With liquid treatment
209 44, 209494, B03B 512
Patent
active
048986666
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to jigs employed in mineral separation, in which minerals of different specific gravity are separated by stratification in a mass which is repetitively dilated and compressed.
BACKGROUND ART
Conventional jigs operate by means of gravity, and may comprise a sieve which is vibrated within a body of water, or a fixed sieve immersed in water which is pulsated. Separation of particles takes place in the jig bed according to specific gravity, the bed consisting of a layer of coarse heavy particles or raging. Particles with high specific gravity penetrate the ragging while particles of low specific gravity are carried away from the ragging by cross flow of water.
In Cross U.S. Pat. No. 4,056,464 there is described a jig in which slurry is introduced on to a rotor on which is held captive, ragging supported on a woven mesh screen, the rotor and screen being of frusto-conical shape. The rotor and screen rotate within a stationary container of water which is pulsed to provide a jigging action supplemented by centrifugal force.
Campbell U.S. Pat. No. 4,279,741 is likewise directed to a centrifugal jig, Campbell employing a cylindrical screen and in one embodiment a rotating chamber.
DISCLOSURE OF INVENTION
The present invention also provides a jig in which centrifugal action is employed in the concentration of the particles in the jigging cycle.
In one form the present invention resides in a centrifugal jig comprising a container mounted for rotation about its longitudinal axis, the container comprising an axial region and a peripheral region with ragging separating the two regions. The centrifugal jig has means for rotating the container, means for introducing feed material to the axial region, means for supplying fluid to the peripheral region, and means for pulsating the fluid in the peripheral region while the container rotates. The pulsating means includes interface means communicating with the peripheral region. The interface means is positioned substantially wholly outside the volume defined by the free surface of the feed material and the projection of that free surface to its intersection with the longitudinal axis.
The machine of the present invention embodies other advances over the machines of Cross and Campbell, as will be found in the following description of several embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectional elevation of a first embodiment of the present invention;
FIG. 2 is a sectional elevation of part of the apparatus of FIG. 1;
FIG. 3 is an incomplete plan view of the body member of the apparatus of FIG. 1;
FIG. 4 is a lateral cross-section of the body member;
FIG. 5 is an incomplete bottom plan view of the body member;
FIG. 6 is a plan view of a cam of said apparatus;
FIG. 7 is a section taken on the line 7--7 of FIG. 6;
FIG. 8 is a side elevation of the cam;
FIG. 9 shows in sectional side elevation a second embodiment of the invention; and
FIG. 10 is a fragmentary view showing the cam driving components of the embodiment of FIG. 9,
FIG. 11 is a partly sectioned side elevation of a jig according to a further embodiment of the invention, in which the diaphragm is eliminated and replaced by an air/water interface, and,
FIG. 12 shows the jig of FIG. 11 in fragmentary cross-section.
The apparatus illustrated in FIGS. 1 and 2 comprises a base which houses driving arrangements which will be described below, and which supports a bearing housing 21. Mounted within the bearing housing 21 by means of tapered roller bearings 22 is an outer drive shaft 23 which carries on its upper end a circular mounting flange 24.
A support housing 25 is mounted on the flange 24 by means of pillars 26. Mounted within the outer drive shaft 23 by means of bearings 26a and 27, and with its upper end located in a bearing 28 in the support housing 25, is a cam drive shaft 29.
The outer drive shaft 23 is driven by chains (not shown) between a sprocket 30 on the outer drive shaft and a sprocket 31 on an idler shaft 32, the sprocket 31 being
REFERENCES:
patent: 2312522 (1943-03-01), Chisholm
patent: 2631728 (1953-03-01), Popp
patent: 3703237 (1972-11-01), Cohen-Alloro et al.
patent: 4056464 (1977-11-01), Cross
patent: 4071440 (1978-01-01), Jedo et al.
patent: 4279741 (1981-07-01), Campbell
Cherry, Johnny
Hajec Donald T.
Lowan (Management) Pty. Limited
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