US1209943A - Concentrating-table. - Google Patents

Description

E. DEISTER.

CONCENTRATING TABLE. APPLICATION HLED JUNE 15, 1916.

Patented Dec. 26, 1916.

"artisan sira'rns Em DEISTER, 033 FORT WAYNE, INDIANA, ASSIGNOR T0 DEISTER MACHINE CQMPANY, OF FGRT WAYNE, INDIANA, ACORPORATION 0F INDIANA.

CONCENTBATING-TABLE.

Specification of Letters Patent.

retested-nee; as, rare.

' Application filed June 15, 1916. Serial No. 103,809.

iConcentrating-Tables, of which improve-- 'ment the following 1s a specification.

The invention described herein relates to certain improvements in concentrating tables and has for its object a construction of table especially adapted for the treatment of ores in which a large percentage of the values occur in thin minute flakes.

Experience has shown that the flakes move over a table with their larger surfaces sub stantially parallel with the surface of the table and hence settle down very slowly through the gangue. Hence when the table is constructed and riilles so arranged that the depth of the material being treated is comparatively deep on some portion of the table above the upper surfaces of the riilles, a large percentage of the flaky values will not, in passing from one rifl'ie to the next, settle down far enough to be positively caught by the rifiies, and held from further movement toward the tailings discharge edge. It frequently occurs that flakes will lodge against a riflle close to the upper edge of the latter, and the action of the flowing material will lift the flakes causing them to turn somer-saults over the rilile. In such turning movement the flakes will move upwardly through the gangue, and a considerable percentage will either not settle down sufficiently to be caught by the next.

rifiie, or settle only such a distance as to strike the upper edge of the next r tfie and somer-sault over it as before stated.

It has been the practice, to use tapering rifiies on concentrating tables, say from three-eighths inch to five-eighths inch high on one end and having a feather edge on the otherend. This construction of rifile has a tendency to bank or thicken the pulp near the center of the table, and as the flaky mineral will not stratify or settle very well in a thick or deep pulp, it follows, that such a construction of riiiie is not desirable when treating flaky ores.

The invention described herein consists generally stated in a construction of table and rifiles permitting of the maintenance of a comparatively thin shallow bed or stream of material spread evenly above the portion or plateau t.

riilles over the entire surface of that portion of the table where gravity separation occurs. and the provision of means for producing a cleaner mineral and a more perfect control of the line of separation between the mineral and gangue.

The invention is hereinafter more fully described and claimed.

In the accompanying drawings forming a part of this specification, Figure 1 is a top plan view of a concentrating table embodying the improvements claimed herein; Figs. 2 and 3 are sectional views on planes indicated respectively by the lines 11-43, and Ill-HI Fig. 1 and Fi 4: is a detail side view of the forward "portion of a riflle, on an enlarged scale.

In the practice of the invention, the outline of table 1, in plan view, is not material.

The pulp is directed onto the feed side of the table throughthe feed box 2, and dressing water is supplied to the launder 8; the table being slightly inclined from the feed side toward the tailings dischar e edge 3, the pulp and dressing water will flow transversely of r tllcs toward such edge. The inclination of the table from the feed side to the edge 3 and the spacing and height of the riflies are adapted to permit of the of the table may be effected by any suitable construct-ion, such mechanism being diagrammatically indicated in the drawings. As the values approach the mineral discharge end of the ritlies. they are caused to move up and ahead of the overlying gangue by the inclined surface 6v arranged transverse of the line of movement of the values caused by the vibration of the table. The inclined surface 6 is arranged diagonally across the table, and terminates in a raised The shape or contour and extent of the plateau beyond the inclined surface 6. is dependent largely on the general shape of the table and the area required for cleaning up. It has been found that when treating lean ores, the values are dischar ed from portions of the plateau adjacent to the lower end of the inclined ap proach to the plateau. In such cases only a comparatively narrow washing surface or plateau is required. The plateau preferably has its surface parallel or substantially.

parallel with the main or stratifying surface of the table. By reason of the slight retardation of the movement of the minerals due to the inclined surface 6, the minerals will be crowded together to a certain extent at the foot of the incline and up along its surface, but as soon as they pass onto the plateau their rate of movement will be accelerated and the mass formation will be destroyed and the particles will move a thin layer over the surface of the plateau, thereby facilitating the final dressing of the mineral by the wash water directed onto the plateau by the .launder 8.

As heretofore stated, the low efficiency of the tables now in use in treating ores containing values in the form of thin flakes, is

duev to the excesisve depth of material above the riffles on some portions of the stratifying zone, and too thin a bed on other portions of the stratifying zone of the table. Heretofore it has been the practice to incline the table notonly transversely of-the riftles, but also parallel therewith, the mineral discharge edge being higher than the opposite end of the table. This longitudinal inclination, in connection with rililes tapering throughout their length, tends to cause the material to bank up on some parts of the table and reduces the depth of the material too much so over other portions of the table, a condition unfavorable for the gravity separation offlaky minerals. In operating the improved table it is inclined in one direction only i e. from the head, or feed side toward the tailing discharge edge as indicated in Fig. 3 and maintained substantially level in the direction of the vibrations as indicated in Fig. 2. This position of the table permits of the employment/of riftles having their upper. edges substantially the same,

height at all points above the main or gravity separating surface of the table, and in order that portions of the rifl'ies extending across the incline 6-may have/their surface substantially in a level with other portions of the riflies, the latter have the portions on the incline 6 beveled off as shown in Fig. 4. The rifiies and the plateau are so constructed and proportioned that the surface of the latter will be a distance above a plane co-incident with the upper edges of the riflles approximately equal to the desired depth of material above such plane. This construction of rifiles and adjustment of the table permits of the maintenance of an approximately equal depth of material over all portions of the stratifying zone of the table. In operating the improved table the transverse inclination toward the tailing disextend from the rear end of the table, and

terminate in a diagonal line i. e. a line an angle less than a right angle to the direction of vibrationof the table, and are so constructed that their effective height above the stratifying surface of the table is maintained in the direction of the length thereof, and extends to the foot of the incline 6, and from the foot of the incline 6 to the crest thereof the rifllesare tapered or beveled ahruptly, this beveled portion of the riiiles corresponding approximately with the incline 6, and terminating at or adjacent to the crest of the incline. I

I claim herein as my invention:

1. A transversely inclined concentratingtable having a deck, means for vibrating the deck, rifilesarranged on the deck substan tially parallel with the direction of vibration, means for feeding't-he material onto the head of the table, said table being downwardly inclined from the head to the tailings discharge edge, but substantially levelin the direction of vibration, the rifiles having their upper surfaces in a plane substantially parallel with the main surface of the deck for substantially their entire length, in combination with a plateau, substantially parallel with the main surface of the table and arranged along the mineral discharge edge, and an inclined surface arranged diagonally across the deck for causing the values to move up above the surface of the material overlying the main surface of the deck and onto the plateau. 1

2. The combination of atransversely inclined co centrating-table, with aplateau having an inclined approach and riflles arranged said table, and extending only to the line ofjunction of the plateau and its inclined aparoach, the upper edges of the riffles and the SL rface of the plateau being substantially parallel, and the surface of the plateau being raised above the edges of the rifiles a distance equal to the desired depth of material above said edges, whereby the surface of the material in the main portion of the table will be in a plane coinciding with the surface of the plateau.

3. The combination of a transversely inclined concentrating table, having an inclmed raised portion arranged along a diagonai line relative-to the line of movement of the table and in proximity to the concentrates discharge edge, and riiiies arranged on the surface of said table and extending from the rear end of said table and terminating in a diagonal line, solid riilies being of substantially unidorin height for a major portion, and'in the direction of the length thereof, said rifles being provided with a beveled portion extending toward one end thereof from said portion of uniform height, said beveled portion 03": the rifles corresponding approximately With said inclined raised portion of the table, and means for reciprocating said teble in the direction of the length of said zrifiies.

d The combination of a transversely in clined concentrating-table having an upwardly inclined portion arranged along-a diagonal. line relative to the line of move ment of the table and in proximity to the concentrates discharge edge, rifiies arranged on the surface of said table and extending toward the mineral discharge edge, said rifiles being provided with an abruptly beveled portion extending toward one end thereof to maintain their upper edges and the surface of the deck substantially parallel in proximity to the inclined portion, said beveled portion of the i'itdes corresponding approximately with said upwardly inclined portion of the table,

and means for recip meeting said table.

I In testimony whereof I have hereunto set my hand.

EMEL DEISTER.

Witnesses:

i F, Dniscrn SYNA finnsnn.

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