USRE11756E - Gre-concentrating table - Google Patents

Description

No. |l,756.

F. L. BARTLETT.

UREVCONGENTBATING TABLE.

(Applicqtion filed June 8, 1899.

Reissued July 4, 1899..

Quebec neoaaa -Qoenna was Ecnsm umocmpmns co., msmnsmn. n. c.

' UNITED STATES PATENT OFFICE.

nnANic L1." iAn'rLE'rr, or CANYON, cotonAno.

ORE-CCNCENTRATING TABLE.

SPECIFICATION formingpart of Reissued Letters Patent No. 11,756, dated July 4, 1899.

Original No. 621,615, dated March 21, 1899. Application for reissue filed June 8, 1899. Serial No. 719,854.

To (all 'wh'o'nt 2'1: may concern.- I

Be it known that I, FRANK L. BARTLETT, a

citizen of the United States, residing at Canyon, in the county of Fremont and State of Colorado, have invented certain new and useful Improvements in Ore-Concentrating Tables; and I do hereby declare the following to be a full, clear, and exact description of the i11YGlll-i0lJ,SLlCl11S will enable others skilled in the artto whichit appertains'to make and use the same.

My invention relates to improvements in the class of concentrators known as shaklug-tables, whereby the ore is made to pass over a surface which is subjected to a shaking or bumping motion either laterally or longitudinally. At the same time the moving ore is subjected to the action ofa flow of wator for the jnn'pose of removing the rocky or of this class hitherto used, as far as I am aware, the water is all applied at once to the end or along the side, and it has a tendency to pile up the ore and to wash the fine particles toward the tailings end, whereby much loss is incurred, the work at'the same time being slow. Such inachinesin order to have much capacity need to be very large, as the ore traverses the table from one corner to the other in a comparatively narrow belt,whereb y onlya small portion of the table is doing work.

The object of my present "invention is to construct a machine which shall be comparatively small in. siac,'but of large capacity, doing more work on a given surface, to separatemore perfectly the different minerals, saving more of the fine materials, and to make a'prjodnct which will need no further separation or rcconcentration.

My invention is illustrated in the accompanying drawings, in which-- Figure 1 is a side elevation of the complete machine. Fig.2 is an end elevation. Fig. l; is a side view of the table. Figs. l and arcviews of the two ends of the same. Fig.

shelves of the series.

(3 is a plan or top view of the table, and Fig. 7 is a cross-section. I

v The various features of my invention reside in the table B, which is constructed with a s'eries of shelves Cin the present case threc extending from one endof the table to the other and being placed so that the water and waste material will flow or may be mechanic ally conveyed from one to the other of the As here shown, the shelves are arranged side by side at descending levels, and this-construction I consider preferable. These shelvcs are considerably inclined laterally, so that the water will flow acrossthem, and as I prefer to constructthem they are substantially level from end to end. The water is admitted through pipes or boxes a, placed lengthwise beneath the upper shelves. Openings are provided alongthe upper side of each shelf connecting with the water boxes or pipes at for delivering water across the riflled surface of each shelf. As herein shown, I-provide a series of perforations ('1 d, delivering water in the form of jets,

which unite and flow in a shallow sheetacross,

effect a complete separation of the heavier material from the lighter, I prefer to make the area of the feed ends of these grooves much greater than the discharge end, as will be seen in Figs. at, 6, and 7, so that as the material in the-grooves works down toward the discharge end of the table it tends to constantly sift to the surface the lighter particles of the material, which are carried laterally across by the flow of water. Means are provided for-conveying the overflow from the side of each shelf to the beginning of the next shelf of the series.

As here shown, inclined spouts E E are provided along the lower edge of each of the two upper shelves to convey the overflow of wator, waste, and unconcentrated material back "to the upper end or beginning of the next lower table, and a spout F along the lower side of the last table of the series carries off the water and tailings from the machine.

Orepresents the feed box or hopper, through which the ore is fed to the upper end of the upper table, and c c are the water-pipes for supplying the boxes at a, each being provided with a separate valve 6. The concentrates are discharged into an ore-box S, Fig. 1, or other suitable receptacle over the lower end of the table. from-the open ends of the grooves C C. If the grooves carry. any waste rock, itis cutout and caught by the conductors G G, which are held-under the end of the table by suitable guides. The in- 'ner ends of the conductors are open, and whatever material falls into them is discharged into thewasteway I and passes olf with the J tailings, or it maybe otherwise disposed of.

- thence'pass to the wasteway.

The position of these conductors is regulated bymeans of the screws H II, and they are made with diagonal ends or partitions for the purpose of cutting oif or dividing the overflowingconcentrates from the Waste material. It will be seen that the farther'out the conductors are drawn the more grooves they will cut out and that the material coming from these grooves instead of falling into the oreboxes below will fall into the conductors and The cut-off strips J J are heldagainst the Y fiat end of the table and pivoted at the, hottom. By swinging the upper ends of these strips a division of the different kinds of concentrators can be made-such as leads from zinc, &c. these separatedconcentrates being dropped into diiferent boxes or receptacles. A varying number of strips is used according to the number of grades of concentrates desired. There may be one at the end of each shelf, as here shown,or two or more may be ;usedif a greater number of grades are made.

The table E is hung to the table A of the machine by means "ofrods P P, adjustingnuts R R being provided for elevating and lowering the table. Motion is imparted to the table'by means of a cam K on a camshaft S, operated by the driving-pulleys M M in the usual manner. g

To operatethe. machine, the ore is crushed andscreencd to proper size, and this material mixed with water is allowed to How in a steady stream through the feed-box O. The motion of the table shakes the heavier particles to a the bottom of the triangular grooves. At the same time the ore moves ahead and is subjected to the impinging flow from the box a. Three forces now act on the ore.1ia1nely', one to move it ahead, one to wash it diagonally. across the table, while the decreasing depth of the grooves has a tendency to elevate the ore to a higher level, whereby the lighter worthless material is brought to the surface. and washed over by the'flow of water.

I havediscoveredthat a groove made in ,ing shelves to do.

the form 'of a right-angled triangle or with one side vertical is more effective than any the third one to eight, these having been found in my'pr'actice togive the best results, although it is evident that the graduation of the grooves should depend on the nature of the ore to be treated. Thus if the ore to be treated consists of one' part valuable mate rial and three parts rocker worthless material then one to four would be the tion of the grooves.

proper graduav In practice I have found that the greater-"- part of thevaluable mineral is removed by first shelf, leaving very little for'the succeed- Any ore which escapes the'first is collected and returncd to the second and third, and consequently there are no middlings or half-concentrated material to be rerun. 13y returni'ngthe ore tothe head of each succeeding shelf it is made to pass over a great length of shelf-..-as, for instance, if the table is eight feet long by returning twice or using three shelves the ore travels twenty-founfeet and the eight-foot table becomes as effective as theoldtwentyfour-foot table of Itit-tenger. In practice it is found that theshelves need not be more than twelve inches wide by seven or eight feet in length,-t-he capacity of the table of this size being greater than the old Ritte'ngert'abletwelve feet in length.

The sliding 'con-ductorsG and the cut-oil? strips J J perform a valuable service by cutwide by twenty-four feet ting out and removing any waste which flows I over the end of thetable and renders the machinemore adjustable and automatic. is particularly the case when working on an ore which contains two or more minerals which it is desircd to save separately by means of separate shelves.-

Three dilferept minerals may be saved .separ'ateiy onefr'oin the other, a very small difference inthe gravity being sufficient to effect a complete separation.

The machine is capable of great adjustability by regulatingthe flow of water on each shelf, and by raising or lowering the sides or ends of the" table laterally or longitudinally very fine or very coarse material may be operated on at will and the capacity regulated with greatfacility If the first shelf is forced, the second or third ,shelf immediately takes .up the surplus, and effective work is still performed. As-little water is uscd on the first shelf it followsrthat less slilnesor fine ore is lost, and in practice it is found that the first shell.

This

takes up the "finer ores, whichis exactly the v reverse of tables where all the water has to he applied at once, After the fine particles of ore are removed on the upper shelf and the material conveyed back to the beginning of the next shelf an increased flow of water may be safely used, sufficient to remove the heavy waste, as there is then no danger of washing away fine rich ore. The advantage of having the riflies extend the full length of the table consists int e fact that much better protection is given to the fine ore, which owing to the rapid vibration of the table iskept below thecoarser parts and will protect them from being washed away by the water, as would, be the case on a .plane surface. By

' reason of the operation of my series of shelves and the fact that they carry the separation of the material so far as I am-enabled to do away with the operation of sizing, this itself.

\Vhile I here show my table as being provided with riflies of varying depth, it is evident that any desired form of 'rifiies may be used.

I claim-*- '1. The herein-described longitudinally-reciprocating shaking-table having a series of laterally-inclined shelves provided with longitudinal riflles extending to the concentratesdischarge end thereof whereby the concentrated material is discharged at the end of each shelf, a separatewater-supply for each shelf and means for conveying the unconeen- 'tratcd material from each shelfexcept the last to the next shelf in the series.

2-. The herein-described longitudinally-reciprocating shaking-table having a series of laterally inclined shelves arranged at descending levels and provided with longitudinal riffles extending to the. concentrates-discharge end thereof whereby the concentrated material is discharged at the end of each shelf, a separate water-supply for each shelf and means for conveying the nnconcentrated material from each shelf except the last to the beginning of the next shelf below.

3. The herein-described longitudinally-reciprocating shaking-table having a series of laterally inclined shelves arranged at descending levels and provided with-longitudiwork all being done by the shaking-tablenal rifiles extending to the concentrates-discharge end thereof, a; 'separate water-supply for each shelf and a spout extending alon g the lower side of each of the upper shelvesexcept the last for delivering the nnconcentrated material to the upperside of the next shelf below.

4. The herein-describedlengitudinallyae ciprocating shaking-table having a series of laterally-inclined shelves arranged side by side at descending levels andprovided with longitudinal riffles extending to the concen tratesvdischarge end thereof, a water-supply for each shelf and a spout extending along the lower side of each of the upper shelves except the last-for delivering the unconeentrated material to the upper side of the next shelf below.

5. The herein-described shaking-table having longitudinal riflies adapted to discharge fine material over the end-of the table and coarse material over the side and having aseries of slidingconductors under the discharge end of the table, each conductor havinga diagonal partition for dividing the overflowing material into sections. I

6. The herein-described shaking-table hav-- ing longitudinal riflies adapted to discharge fine material over the end of the table and coarse material over the side and having a series of sliding conductors under the discharge e nd of the table with diagonal partitions therea in for cutting off waste material and cut-oft strips pivoted against the end of the table for separating the concentrates into different grades. y l

7. In an ore-concentrator, the combination with a reciprocating shaking-table having a series of laterally-inclined shelves each pro- ,vided with rifiies extending in the. direction of the reciprocation, an independent water supply for each shelf adapted to deliver water across said riffles and means for conveying the unconcentrated'material from the lower side of each of the upper shelves to the next

Images