US1354550A - Concentrating-jig - Google Patents

Description

GVGLOCKEMEIER.

CONCENTRATING HG.

APPLICATION FILED JUNE 28, 1919.

1,354,55 Patented Oct. 5,1920.

6. GlocKem eier Attorney UNlTED STATES PATENT OFFICE.

GEORG GLOCKEMEIEB, OF LUDERITZBUOI-ZT, SOUTI-i VVES'II PROTECTORATE, SOUTH AFRICA, ASSIGNOR T0 CARL KEAUSE, OF LUDERITZBUGHT, SOUTH WEST PRO- TECTORATE, SOUTH AFRICA.

CONGENTRATING-JIG.

Specification of Letters Patent.

Patented Oct. 5, 1920.

Application filed June 28, 1919. Serial lilo. 307,448.

T 0 all whom it may concern:

it known that 1, Gross Gnocnnnrninn, citizen of South Vi est Protectorate, South tries, residing at Luderitzbucht, South est irotectorate, South 3* Tim, have inccrtain new and useful Improve ants in Concentrating igs, of which the tolii 4 specification.

The oresent invention relates to jig concentrating apparatus for recovering diamonds and other precious stones and ore concentrates; said apparatus being of the id in which relative vertical reciprocation brought about between a bed of the material carried on a sieve and a body of water in which it is immersed.

The present invention is based on the discovery that when the jig screen is curved or inclined the concentrate tends to rise to the highest point of the screen instead of passir to the lowest point as has hitherto been iought. This phenomenon can be explained the fact that the shape of the sieve causes 1 bed radually to decrease in thickthe higher part of the screen. The wa er acting upwardly on the bed, finds t r sistance toward such thin part of the c. stream of water, which is origially perfectly vertical, is thus diverted tothe highest point of the screen and the concentrates,being the heaviest particles, and therefore lyin immediately on the screen,are pushed rorward in the direction of the highest point.

The present invention accordingly consists in the method of forming a jig bedof gradually varying thickness and discharging the concentrate at or near the thinnest point or Zone of the bed. N The invention also consists in a jig having an inclined or curved screen, in which the means for feeding the jig material and the discharge orifices for the concentrates are disposed to take advantage of this rising tendency of the concentrate. The invention also consists in the specific forms of sieve herea fter described.

In the accompanying drawings Figure I is a vertical section of a jig of the Schiechel type embodying the invention.

Fig. IT is a plan of the screen drawn to a larger scale.

Figs. Hi and IV are sectional elevations taken at right angles to one another of a rectangular screen suitable for a Hartz Referring first to Figs. I and ll, 1 is the screen mounted on a frame 2 and supported in dome form by ribbing 3, 3

The sieve is carried at the top of a chamber i communicating with an annular cham- 5 closed at the top. Said chambers 4 and 5 contain water to about the level of the sieve; and pulsation of the water in chamber i is brougnt about by pulsations of the air toe ieed possible with the rising movement of the concentrate. Accordingly the feed spout 10 is arranged to deliver the material onto a restricted area at the center of the sieve. The discharge holes are arranged, as appears in Fig. ii, in a circle at such a distance from the center that the pressure of the feed ceases materially to interfere with the climbing tendency of the concentrate.

The supporting frame on which the sieve mesh rests is arranged to interfere as little as possible with the direct action of the water on the jig bed. The members 3 of the supporting ribbing are radial; and where an annular nember 3 is employed it is placed within the Zone of the discharge openings 8. This feature is of importance in the successful operation of the sieve since the proper movement concentrate lying on the sieve depends upon the direct pressure of water upon it. It for instance the annular member 3 were placed outside the ring of holes 8, it would form a barrier past which the concen- 'trate could be moved only with great difiipulsations of the water or the sieve frame.

It was believed that the concentrates went to the center of the stretched sieve because this was the deepest point in the suction phase.

While therefore the discharge orifice was positioned in'the center, the jig material was fed to an annular zone half way between the edge of the sieve and the center. The result was that the fresh material formed a barrier which the concentrates could only pass with difliculty on their way to the discharge. The output of such a sieve is materially increased by modifying it in accordance with this invention.

Figs. HI and IV illustrate an application of the invention to a sieve for a jig of the Hart'z type in which the sieve is rectangular, the jig material being fed at one end 11 and the 't'ailings being discharged at the other end 12.

In this case the sieve is curved or inclined upwardly from both sides to the middle longitudinal line 13. The supporting ribs 3 are arranged transversely to the length of the sieve. Concentrates mount to the central ridge of the sieve and are carried by the general longitudinal movement ofthe whole material to the concentrate discharge spout 14;, 15 which is situated on the central line and near the discharge end 12. The discharge spout consists of a fixed tube 14 and a tube 15' revoluble therein. Said tubes are formed with corresponding apertures 16, through which the concentrate passes away. By rotating the tube 15 the size of the discharge opening can be regulated.

I claim a 1. A jig sieve having sloping sides and a raised central portion provided withconcentrate discharge openings in proximity to its highest point.

2. In a jig, an upwardly domed sieve having concentrate discharge openings in an annular zone near to the center, and a feed device arranged to feed jig material to a restricted area in the center of the sieve.

3. A rigid jig sieve including a convex screen body having a circle of concentrate discharge openings near the center, a supporting rim at the outer edge of the screen body, a reinforcing ring secured to the screen body and positioned Within the circle of openings and radial ribs between the ring and the rim.

In testimony whereof I affix my signature.

GEORG GLOCKEMEIER.

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