US60089A - Impeovemmt in tables foe concentrating ores - Google Patents

Description

H. A. THOM PSON.

Patented Nev. 27. 1,866L

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tait@ i. tatrs stmt @ffice IMPRVEMENT IN TABLES POR CONCENTRATING GRES.

HENRY J@iLDRRsON THOMPSON, or GRANT, ,GTPPs-f LAND, vIeTORIn.,

Letters Patent No. 60,089, elated November 27, 1866.-` j i SPECIFICATION.

-TO ALL WHOM IT MAY CONCERN: 1 y v p Be it known that I, HENRY ALDERsON THOMPSON, of Grant, Gipps Land, British colony Victoria, have invented a new and improved Percussion Table for Goncentrating and Dressing Orcs; and I do hereby declare that the following is a full, clear, and ei'ract description thereof, which will enable others skilled `in the art to make and use the same, reference being .had to the accompanying drawings, forming part of this specification.

The object of this invention is to provide a table for concentrating and dressing ores, on which the material,`

i is kept in a loose state by means of stirrers, thus allowing a more perfect concentration withless loss at one dressing than can be obtained on the plan now generally used by means of several dressings.

In the percussion table now largely used" in ore-dressing, the material on the table f rms a hard bank, which impedes the tendency of the heavier ores to concentrate, and consequently the sands or slimes operated on have to be dressed several times before they are lbrought to a :suiiicient degree of richness. This repeated dressing adds considerably to the expense, and in each manipulation a loss of ore occurs. These drawbacks render the pgrcussion table in its present form inapplicable to the separation of gold ores. VBy my invention these defects are completely overcome. To make the same more clearly understood, I will now proceed to describe my apparatus and the mode of operating it, reference being had to the annexed drawing, in which-'- Figure I represents a side elevation of my improved table, the side supports, N, being removed. Figure 2 is an end view; and

Figure 3 an isometrical perspectiveview of the same. p Figure 4 is a cross-section through the stirrers, P Q, and their supports, O and N, taken on the line :v iig. 1.A Figure 5 is a cross-section through thestirrer head, P, taken on the line y y, g. 4.

Similar letters of reference indicate like parts.

i A Ais -the ordinary framework. B is the'. percussion table, of suiiicient length and width its `upper sur-` .face covered with boiler plate. -The table, B, lis. enclosed on the sides with boards, D, which gradually incline upwards near 'the head, C, said head being` a solid wooden-block, its sides of a triangular shape, its surface being inclined at an angle of about 22, as seenin figs. 1 and 3. The table is supported or hung on four chains,

with regulating screws on each in order to adjustthe lateral level ofthe table. The chains at the foot of the i table pass over rollers, F, ixed to the frame and acted upon by levers, G, as shown, for the purpose of raising` and lowering that end of the table. The head-chains are attached to a rack, H, in order to permit the changing of the inclination of the chains, as by an increased inclination of the chain the table is brought back with a sharper blown and the eil'ect of the percussion increased. Iis the distributing-board, having `the usual triangular distributing-blocks, upon which board the material .to be treated is fed. L, a cam working" `on a cam-shaft i which is made to revolve with the required velocity, so that the cam strikesV the lever, K, working on its axis, a, whereby the upper end of the lever, K, is pushed from the framing, while its lower end, which rests against the head, C, of the table, pushes the'said table away from the block, M, to the extent of` the stroke of the cam.

By its own gravity the table then falls backagainstthe block, and thus receives the percussion blow. To` the i frame, A, are attached side-bearers, N, which act as supports for the strrer frame, O, as shown in iig. 4. Pare transverse bars, provided with pins at their ends hanging loosely in theirbearings, 0. To these bars `are attached the stirrers, Q, which are made of wire rods, of appropriate length, their `ends being slightly curved, as seen in iig. 5, for the purpose of better sliding on the table, B. Two screws, R, pass through the main frame', and are operated by handles, S. These screws are for the purpose of pushing the stirrer frame orbars, `0,

nearer to the head of the table, or 'uz'ce lbereut, as may be required; so that, should, for instance, the stroke of the Vtable be lessened, then it would be necessary that'the stirrers should 4be'nearer to the head than before. i

I will now proceed to describe the operation of my apparatus: The lower end of the table is first raised labout one inch above the level by means of the roller, F, operated by levers, Gr. The distributing-board is then supplied with material and witli the necessary amount of water until there `is about two and a half inches of depth of material at the lower end of the incline formed by the head, C. The table is then'gradually `lowered in such a manner as to preserve constantly this depth of material. When the table is suiiicientlycharged with the material concentrated, the rsupply is cut oii' and a stream of water is admitted at` the rate of about twelve gallons per minute, and continued until there is a good concentration of material at the head of the table, the foot of the table having in the meantime been gradually lowered suilcently to allow ofthe waste material being waslied away, such lowering being in no case to a greater extent than about one inch below the,

level. 'lhe supply of clean water is then cut oand the action of lthe table stopped. The transverse pieces 1, 2, and 3 are lifted out, and the material lying o n the table from whence they have been removed is taken ont and subjected to suitable treatment for the extraction of the precious metals. The. stirrers l, 2, and?) are then replaced, the foot of the table is elevated about three inches above the level, the percussive action of the table is renewed, and the distributiugboard is` again supplied Awith fresh material. -The result is that the material which remained on the table'returns after a few percussions to the head, where it is again subjected to the action of the table, together with the fresh material. The foot of the table is then gradually lowered as before, always preserving,r the two and a half inches depth of material at the head, as stated above. Instead of working continuously, as just described, it may be preferable or necessary to work in charges. In this case the lower end of the table must be raised sufficiently high to allow the table to hold the charge, which should be placed at the head, as much water being continuously supplied as would keep the material loose. The table is then put in motion and kept at work until the valuable material is concentrated at the head, when the foot is gradually lowered and the waste material washed olf with an increased supply of water; the front stirrers may then be lifted out and thc material removed as before. l

Having 'thus described my invention, I claim as new, and desire to secure by Letters Patent- The combination of' the frame A, supports N, and screws R, with the table B, stirrers Q, and stirrer frame O, substantially as and for the purposes herein shown and described.

The above speciication of my invention signed by me this 26th day of July, 186e,

HENRY ALDERSON THOMPSON.

Witnesses:

THoMVAs Dominee,

EDWARD WATERS,

canso

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