US769231A

US769231A - Ore-concentrator.

Info

Publication number: US769231A
Application number: US16135403A
Authority: US
Inventors: George E Perkins
Original assignee: Individual
Current assignee: Individual
Priority date: 1903-06-13
Filing date: 1903-06-13
Publication date: 1904-09-06
Anticipated expiration: 1921-09-06

Description

No 769,231. PATENTED SEPT. 6, 1904.

G. E. PERKINS.

ORE OONGENTRATOR.

APPLIGATIOXT FILED JUNE 13, 1908 N0 MODEL.

o ooii i E Y' e Q Qvifncmc Z (k v 7 6 0785 rin/s.

UNITED STATES Patented September 6, 1904.

PATENT OFFICE.

ORE-CONCENTRATOR.

SPECIFICATION forming part of Letters Patent No. 769,231, a ed September 6, 1904.

Application filed June 13, 1903. Serial No. 161,354. (No model.) I

To all whom itmay cancer/1.;

Be it known that I, GEOR E E. PERKINS, a resident of the city of Providence, in the county of Providence and State of Rhode Island,have invented certain new and useful Improvements in Ore-Concentrators; and I do hereby declare that the following-is a full, clear, and exact description thereof, reference being had to' the accompanying drawings, and to'the letters of reference marked thereon, which form a part of this specification. V

This invention pertains to improvements in ore-concentrators, and has for its object to collect and return the partly-separated pulp, or that portion known as middlings, back to the table, where it is deposited at a point just below the pulp-feed to the table, thereby materially increasing the percentage saved of the richer or more valuable portion of the material during this second separation.

The invention consists of novel features and parts and combinations of the same, as will be fully described hereinafter and then pointed out in claims.

' A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the'views- Figure 1 is a plan view of the table, showing my spout or trough in position to conduct and deposit the middlings around and below the pulp-feed. Fig. 2 is a side elevation of the table, showing the-spout for conducting the middlings from the end of the table back to the elevator. Fig. 3 shows the mechanism for imparting to the table a reciprocating motion. Fig. 4 shows the elevator, the trough leading to it, and the spout leading from it.. Fig. 5. is an enlarged perspective view of the main feed or distributing trough, showing the distributing 7 holes through the rear wall of the same. Fig. 6 is a detail sectional view on the line 6 6, Fig. 1.

Referringzto the drawings, A is the table, which tapers from the head toward the foot,- where it is the narrowest, and is transversely inclined, causing the gangue or waste pulp to be dischargedat its lower edge and the mineral or richer portion at the foot thereof.

This table is provided with longitudinal riffles 4, attached to its upper face, which are of unequal, length, increasing from the upper edge of 'the' table downward, where they are the v longest, the lowermost rifile-extending nearly the full length of the table. To the right ofthe rifiie extremities ,(see Fig. 1) there is a portion B of the table which is smooth or free-from rifiies.

H is the main feed-spout, through which the material is'fed to. the distributing-trough I.

This trough runs along the upper edge of the table, extending nearly throughout its length. On the lower edge and through the rear wall of this trough are a series of holes L. (See Fig. 5.) A dam or stop-wall J is placed in said trough a short distance from the pulpfeed end,.forminga pocket for holding and distributing the pulp on the table'througli said holes L. The trough beyond this dam is for the purpose of receiving water through the supply-pipe K and distributing it over the table through the series of holes L in its section for this purpose. Atthe narrow end or foot of the table is a receptacle C for receiving the concentrates or richer portion of the separated material.

E is a spout or trough extending from the foot of the table along the side to the elevator F. The apron G extends along the, side'of the table and is for the purpose of conducting the gangue or waste over this trough E, causing it to be deposited into asuitable drain or waste trough below. Near the foot of the table the space or aperture D is left open, through which flow the middlings or that portion of the pulp from which the richer mineral .has not been entirely extracted. These middlingsare conducted through the aforesaid trough E to the elevator F, byiwhiclf the'yv are,raised.a'nd deposited into trough M', which trough in turn conducts them around back of the distributingtrough I, where they aredeposited onto the table beyond the point where the initial pulp is discharged onto the table.

To the head end of the table is attached the mechanism which gives said table a longitudinal reciprocating movement and is de-. scribed as follows: o is a keeper which is engaged by one extremity of-a vertical lever 0,

fulcrumed at (Z on a support 6, mounted on the stationary frame f. The upper arm of the lever o is slotted to receive a bolt g, which holds a block b in place on the lever. This block. carries an antifrictional roller i, which engages the outer wall of the keeper 1). The block h is adjustable for the purpose of changing the bearing-point on the keeper, and thereby regulating'the length of the tables stroke. The lower arm of the lever c is provided with a bearing 1', which is engaged by one extremity of a link It. This link is connected at Z with a link in, forming a toggle-joint. One extremity of the link engages a bar j, attached to the stationary frame. The pin connecting the two toggle parts also passes through one extremity of a pitman m, whose opposite extremity is connected with a wrist n on a crank 0, carried by a shaft 1), journaled in an upright support 7', mounted on the stationary frame f. The shaft 1) is provided with tight and loose pulleys s, which may be connected with any suitable motor for operating the mechanism. The outer extremities of the toggle are open, being simply recessed or forked to engage the bearings j and respectively. Hence as the shaft 1) is rotated the toggles only impart the backward movement to the table or move it toward the left. The forward or reverse movement is effected or imparted by the recoil of a spring t, which is compressed or placed under tension by the table during its backward movement.

In the operation of the machine the material to be treated is discharged in the form of pulp upon the upper right-hand corner of the table through the supply-trough H. (See Fig. 1.) The gangue or waste passes transversely downward over the longitudinal riflies and is discharged over the apron G at the lower edge of the table, the middlings, or that portion partially separated or which still contains a percentage of the more precious minerals, is carried through the space D at the end of the table into the trough or spout E and back by way of the elevator F and spout M onto the table to be treated again and more thoroughly separated, while the mineral is discharged over the foot into the receptacle 0. All the mineral, together with a portion of the gangue, is first caught by the riffies and under the influence of the tables motion is carried longitudinally toward the foot until it reaches the smoother unriffled portion B, where it is acted on by the water, which effects a perfect or approximatelyperfect separation of the gangue from the mineral. As the material caught by the uppermost and shortest rifiie passes to the portion B of the table the action of the water, which is fed to the upper edge of the table, carries the gangue downward to the next riflie, while the mineral remains on the smooth portion B and is carried toward the tail of the table, where it is finally discharged. It is expected that some of the mineral caught by the uppermost and shortest riiile will be carried downward with the gangue to the next rifiie, which is longer: Afterleavingthislastnamed riffle and passing to the smooth or unriffled portion of the table the water again acts on the material and carries the gangue downward to the next rifiie, leaving the clean mineral on the smooth portion B of the table.

In this manner the material is carried transversely downward and longitudinally forward, the gangue being discharged at the lower edge of the table completely impoverished of its mineral values, and the partially-separated material or middlings are discharged through the aperture D into the trough 1C and returned to undergo another separation, while the richest portion is discharged at the foot or tail of the table. A portion of the gangue that is to say, the light part thereof passes over each riffle in succession from the shortest or uppermost to the longest or lowermost riffie. The mineral and the heavier gangue are caught by the rifiies and finally separated on the smooth portion B of the table.

The essential feature of this invention is my improved method of acting upon and saying the middlings. The middlings are of a comparatively light weight, and when they are first deposited upon the table with the rest of the gangue they are not able to free themselves and entirely withstand the strong flow of the mass with which they are mixed in their first passage across the table and are therefore carried through the aperture 1) and dcposited in the middlings-trough at the lower left-hand corner, whence they are returned and again deposited on the table, this time beyond this strong flow of material, where the water alone can act upon the particles and finally wash and free them from the gangue, allowing them to be carried and deposited in the receptacle C at the foot of the table and saved. The idea of carrying and depositing these returned middlings around and beyond the point where the pulp is primarily fed to the machine is of great inn'iortance and has been so demonstrated in practice. For example, should the middlings be deposited on the table at-any point above the pulp-feed instead of below it these light particles would again be swept away by the flow of the gangue, as they were the first time, and could not be saved, as is now the case, by the use of my improved method. These middlings constitute a very considerable proportion of the whole values in the pulp, and by returning them to the table in the manner above described a much larger percentage of the valuable mineral is saved.

Having thus described my invention, what 'I claim as new, and desire to soon re by Letters Patent, is

1. A device of the character described, eomprising a concentrating-table, a distributingtrough arranged. near one side thereof and having perforations in its outer side, said trough being elevated, whereby middlings may pass thereunder, a second trough elevated above the plane of said discharge-trough and terminating at a point beyond the outer sideof the latter and nearer the concentrate discharge than the initial pulp-feed, means for collecting the middlings from said table and delivering them to said elevated trough, andmeans for supplying Water to said distributing-trough.

2. A device of the character described, comprising a concentrating-table, a distributingtrough arranged near one side thereof and having perforations in its outer side, said trough being elevated, a pulp-feeding pocket formed in said trough, an inclined trough located at the opposite side of said table and leading from,

the lower end thereof, an apron'located over GEORGE E. PERKINS.

In presence of .H WARD E. BARLOW,

E; LOGDEN. v