CA1052736A - Mobile magnetic pulley and vibrating grizzly separator for furnace slag - Google Patents

Abstract

ABSTRACT OF THE DISCLOSURE
A portable slag beneficiating plant for processing steel mill slag and separating metallic pieces therefrom and classifying the metallic pieces as to particle size has an elongated frame with a Feed hopper, springs on the frame support an inclined grizzly positioned beneath the feed hopper, an eccentric device is attached to the inclined grizzly for oscillating the same. An inclined conveyor belt is trained over a magnetic separating roll and arranged to receive material from the grizzly and move it to a second grizzly which is positioned beneath the magnetic separating roll, a second eccentric device is attached to the second grizzly for oscillating the same. A second conveyor belt extends from beneath a portion of said second grizzly to a point adjacent one end of said frame, individual hydraulic motors are arranged to drive the eccentric devices, the magnetic separating roll and the conveyors. Separate controls for the hydraulic motors enable them to be individually controlled. This invention distinguishes from others by reason of the separate motors for the several devices and conveyors and the individual controls therefor.

Description

`~5 Background of the Invention t1) Field of the Invention:
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This invention relates to installations for proeessing steel mak;n~ slag and refuse to reclaim reuseable metallics therefrom.
(2~ Description of the Prior Art:
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Plants of this type have largely resorted to various crushing devices incorporated with sizing and various forms of magnetic separation. See for exampie U.S. Patents 3,178,122 af February 14, 19~1 issued to Frank E. Rath in which magnetic separa7ing drums are employed and 2, 971 ,7C13 of Apri I 1 3r 1 96S issued to Eric H . Heckett in which a conveyor belt and magnetic pulley metailic separator is disclosed. No prior art is known wherein the various lengthwise arrangement of sizing and separating devices are individually controlled with respect to rate of travei of the rnaterial being proeessed and the variants of capacity inherent therewith.

This invention advantageously locates the sizing and separation stages in a portable slag beneficiating plant and provides for th~ individual control of the several stages by the variable drive arrangem~nt in the flexible hydrauiic drive means disclosed.
Summary of the Invention :
~ A portable slag beneFiciating plant arranges a receiving hopper and `- 20 a first sizing stage at one end oF a lengthwise assembly which includes a -"
second sizing stage and an intermediate metall;c and slag separating unit :, wlfh the separated metallics being processed by the second sizing stage and the metallic and slag separating unTt delivering the separated siag to a length-wise conveyor for remote disposal.
Description of the Drawings Figure 1 is a side elevation of the center and left hand portion oF
; :~ portable 5IClg beneFiciuting plnnt;

28 Figure lA is a ~id~ ~levatlon of the right end portion of the slag " ' '''" .

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beneficiuting plant of Figure 1, lines AB on Figures 1 and lA indicating the cont;nuation;
Figure 2 is an end elevation on line 2-2 of Figure l;
Figure 3 is a vertical section on line 3-3 ~ Figure 1, and Figure 4 is a symbolic diagram of the hydraulic drive and individual motor control for the several hydraulic driving rrlotors in the siag beneficiat;ng plant.
Description of the Preferred Embodiment By referring to Figures 1 and lA of the drawings, as positioned in end 10 to end arrangement, it will be seen that the form of the invention chosen for illustration herein comprises a main horizontal frame 10 supported ad jacent its left end by a sub-frame 11 and a pair of tandem wheel and axle assemblies 12. The other, or right end, of the portable slag beneficiating plant is supported by a steerable wheel and axle assembly 13 carried on a ~- secondary sub-frame 14. A separable tow bar, not shown,may be used to move the portable slag benefic;afing plant at a mill site or other location as will occur to those skilled in the art.

By referring to Figure 1 in particular and the left end thereof, it will be observed thut an angu!ar frame 15 extends downwardly to the left and 20 directly supports a conveyor belt pulley 16 and an ad jacent tensioning idler 17 over which a first conveyor belt 18 is trained. The angularly disposed frame 15 extends both downwardly to the left end of the slag beneficiating plant as seen in Figure 1 of the drawings and upwardly therefrom to a second horizontal frame 19 which directly supports a magnetic separation pulley 20 by means of journals 21 carried on the second hor;zontal frame 19.
The first conveyor belt 18 is trained over the magnetic separation puiley 20 and it will be observed that the magnetic separation pulley 20 is 28 of relatively large diarneter as compared with the pulley lb. An idler pulley ,,, , , ., . .

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22 carried on the angular frame 15 ad jacent the upper end thereof causes the first conveyor belt 18 to adhere to a substantial portion oF the surface of the ,.
magnetic separation pulley 20 as best seen in Figure lA of the drawings.

By referring again to Figure 1 of the drawings, and the left end th~reof, ~,.
it will be seen that a hopper 23 is supported on a third horizontal frarne 24 which in turn is carried on a plurality of vertical frame members 25 so as to position it in elevated relation to the angular frame 15 and the first conveyor belt 18 which travels therealong. Immediately beneath the hopper 23 there is a first grizzly 26 which has an inclined surface extending to the left as seen in Figure 1 and as will be understood by those skilled in the art, comprises an arrangement of spaced bars secured to a frame which in turn is supported on Q plurality of springs 27 and provided with an eccentric vibrating device 28 driven by a first hydraulic motor 29.
The spaced bars form the initial si~ing and separating of the siag as dumped thereinto which usually inciudes large chunks and sometimes skulls which are chunks of ferrous metai. The spaced bars have vertical vanes ..
on some of them which are open at the leff end as seen in Figure 1 and the bars which form the lower surface of the grizzly 26 are inclined toward the lower left end of the device as seen in Figure 1. Thus chunk separation occurs with the large chunks being e jected to the left. The remaining p;eces which are partially broken and sized drop onto the first conveyor belt 18 and are carried upwardly to the right thereof by the first conveyor belt 18 ancl pass over the magnetic separator pulley 20 and by referring to Figure lA of the drawings, it will be observed that the slag, which is non-rnetallic, flows off the end of the first conveyor belt 18 as it passes over the upper outer one-fourth of the magnetic separalor pulley 20 and falls into u secondary hopper 30 which : ~.
directs it downwardly and to the right as seen in Figure lA and onto a second 28 conv~eyor belt 31. This conveyor belt 31 is supported on a conveyGr frame 32 which is pivoted to a sub-frame assembly 33 at its inner end, beneuth the hopper .' ".
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30 and which includes a vertical section 34. Tie rods 35 extend from the upper end of the vertical section 34 to a point near the outer end of the conveyor frame 32. A driving pulley for the seconcl cor~veyor belt 31 is at the outer end of th0 conveyor frame 32 and is indicated by the numeral 36 and it is d;rectly driven by a variable speecl hydraulic motor 37. The slag carried outwardly by the second conveyor belt 31 is deposited in a slag pile beneath the outer end of the second conveyor belt and is generally in the form considered useable as a commercial slag as for example in Portland concrete and asphaltic concrete, etc.
Those skilled in the art will observe that the slag thus separated and sized by the portable slag beneficiating plant disclosed herein may be further sized and/or crushed for other commercial uses if desired.
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By referring to Figure 2 of the drawings, an end elevation on line 2-2 of Figure 1 may be seen and the arrangement of the receiving hopper 23 and ` gri~zly 26 more clearly illustrated, there is a collecting and guiding sub-structure ~, 38 disposed beneath the grizzly 26 so that the material passing through the grizzly 26 will be delivered to the first conveyor beit 18. The vertical flanges ~ .
which are thicker at their right hand ends c~s seen in Figure 1 of the clrawings, will be seen standing vertically on the inclined bar structure of the grizzly 26 20 where they are indicated by the numeral 39.

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. ~ By referring now to Figure 3 of the drawings u vertical section on line 3-3 of Figure 1 showing the right hand end thereof and the left end of Figure J', lA may be seen and itwill be observed that the magnetic separating pulley ;~ 20 rotatable in its journals 21 is directly driven by a third hydrnulic motor 40. The second hopper 30, which is disposed partially therebeneath may also be seen.
r~ l By referring to the right hand portion of Figure 1 and the left hand 28 portion of Figure lA it will be seen that a second grizzly 41 is positioned on .,, . -6-:
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springs 42 on the principal horizontal frame 10 with a portion thereof beneath the magnetic separation pulley 20. A guide 43 extends between the hoppar 30 and the right hand end of the second grizzly 41 to direct the separnted metaliic particles thereonto. This second grizzly 41 also includes a piurality -:~ of transversely spaced longitudinally extending bars which are arranged with narrower spaces therebetween at their right hand end as seen in Figures 1 and lA and relatively wider spaces therebetween at their left end as seen in Figures 1 and lA so that the metallic particles delivered to the right end will result in a first separation of small metallic scrap from fines to one-half inch in size and as the grizzly operates it moves the metallics to the left as seen in Figures 1 and lA so that the next largest sizes, those metullic pieces between one-half and three inches in diameter, are next separated while the larger pieces, . those over three inches, are conveyed by the grizzlys shaking and conveying action to the left end thereof as in Figure 1 and onto an angular guide 43 which delivers them to a point of accumulation ad jacent the tandem wheel and axle assemblies 12 of the slag beneficiating plant.
r The middle sized metallic particles fall directly from the grizzly 41 , ....
to a pile immediately therebeneath and the fines and particles up to a half inch in size fall onto a third conveyor belt 44 which travels them to the right . ~ as seen in Figures 1 and 1 A to a point of accumulation beneath the sub-frame . 33 and the inner end of the second conveyor belt 31.
The second grizzly 41 includes an eccentric vibrating device 45 and it is driven by a fourth hydraulic motor 46. The last mentioned conveyor belt 44 which receives the smallest metallic particles is driven by a fifth hydraulic :~.
: motor 47'.
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It will thus be seen that the slag including all sizes from fines to large ;!;', . chunks along with metallics of varying sizes is initially delivered into the !~ ~
', 2d benefi,ciat;ng plant l:,y ihe hopper 23, Ihat th first sizing :nd separa~ian `:

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occurs in the firs~ griz~ly 26 with the metailic and slag separation occuring at the magnetic separating pulley 20 while the s cond gri~zly 41 classifies the metallic particles by size and the second conveyor belt 31 deiivers the slag to the far s~pposite e~cl of the slag beneficiating plant.
In order that various slags with various metallic contents ancl in varying amounts may be quickly and efficiently handled by the portable slag benef;ciating plant disclosed herein, the five hydraulic mators 29, 37, 40, 4~ and 47'which individually driva the five critical moving parts of the slag beneficiating plant are individually controlled by five separata control valves 47, 48, 49, 50 and 51 mounted on 8 common manifold 52 which communicates by way of power piping and flexible connections with threa hydraulic pumps 53 which are driven by a suitable power source such as an intarnal combustion engine 54.
- The engine 54 and the pumps 53 are carried on a transverse member 55 supported on the angularly disposed frame 15 which has heretofore been referred to as ; :. .
supportin~ ~nd positioning th~ first conveyor bel~ 18 as it directly supports a , . .
pluralit,v of rollers which in turn support and shape tha conveyor ~elt 18 as will be understood by those skilled in the art~ .
A ~luid reservoir 56 is positioned ad jacent th~ engine 54 and the pumps 53 are in communiccltion therewith, it receives return lines 57 which communi -cate with the hydr~3ulic motors 29, 37, 40, 46 and 47'respec;ively.
~;: By referring now to Fiaure 4 of the drawinas, a schematic diagram of the hydraulic system may be seen. It wiil be observed that the pumps 53 !'i' ~ ' , J.'`; ' supply hydraulic fluid under pressure throu3h communicatinglines 58 to the '`i manifold 52 af spac~d intarvals th~raalong to insur~ ths maint~nance of even hydraulic pressure therein at all times.

The valves 4~7 - 51 which are continuously variable hydraulic valves communicate directly with the manifold 52 and with Ihe hydraolic motors 29, : .
;; 28 ~), 40, 47'~ncl 37 respactively by way of hydraulic lines 59/ ~0, 61, ~2 and :
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63 and the return flow from the respective hydraulic motors is by the return lines 57 heretofore referred to, which as hereinbefore noted communica~e directly with the reservoir 56. The pumps 53 communicate with the reservoir 56 by way of hydraulic iines o4. The manifold 52 communicates directly with the reservoir 56 by way of a constant pressure inlet valve 65. Levers 66 on the valves 47 through 51 respectively provicle for the individual manual control there~af and therefore enable the operator to manually control the - speed of the several hydraulic motors and thus the sp0ed of the first grizzly 26, the first conveyor belt 18, the second griz~ly 41, the second conveyor lS) belt 31 and the fourth conveyor belt 44. fhe operator is provided with a platform on the main horizontal frame 10 so as to position him ad jacent the control vaives 47 - 51 respectively. From this position the operator can observethe amount and condition of the slag being put into the hopper 23 and he can vary the operation of the first grizzly 26 responsive to the particular needs of the material being processed. For exampie speeding up the first grizzly 26 ` ~ will cause a more rapid break up and sizing of large chunks of slag and slowing it down will vary the rate of the material being delivered to the first conveyorbelt 18. C:ontrolling the speed of the conveyor belt 18 by varying the speed of rotation of the magnetic separating puliey 20 through the control 2t) of the third hydraulic motor 40 enables a more efficient separation of slag and metallics to take place as speed of delivery of the metallics to the magnetic separating pulley affects the disposition and placing of the metallics r~lative thereto. The varying of the speed of the second grizzly 4i again responsive to the condition of the material being handled assures the more accurate sizing oF the metallic purt7cles as hereinbefore described and varying th0 speed of the conveyor 44 and the slag discharge conveyor 31 accommodate vurying volumes and speeds of materials being processed. Thus a high rate of efficiency ~8 of metallic and slag s~sparation is more readily o~tained due to the Flexability --9~

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of control occasioned by the individual hydraulic control of the several drivingmotors which operate the various portions of the porfable slag beneficiafing ; plant.
A plant formed in accordance with this invention efficiently handles 5 steel mill slc7g at the r~te of two hundred tons per hour with a very high mehllic and slag separation and the very desirable sizing and classification csf the metallics separated in the plant.

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Claims (5)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. In a portable slag beneficiating plant for processing steel mill slag and separating metallic pieces therefrom and classifying the metallic pieces as to particle size, a frame, a feed hopper on said frame, support springs on said frame, an inclined grizzly on said support springs and positioned beneath said feed hopper, an eccentric device attached to said inclined grizzly for oscillating the same, a magnetic separating roll and a conveyor belt extending from beneath said inclined grizzly to and trained over said magnetic separating roll and arranged to drive the same, second support springs on said frame, a second grizzly on said second support springs and positioned beneath said magnetic separating roll, a secondary hopper positioned partially beneath said magnetic separating roll to receive metallic material, a second conveyor extending from beneath said secondary hopper to a location beyond said frame, a second eccentric device attached to said second grizzly on said second support springs and a third conveyor extending from beneath a portion of said second grizzly to a point adjacent one end of said frame, a source of fluid pressure, a hydraulic motor connected to said first mentioned eccentric device for actuating the same, a second hydraulic motor connected to said second eccentric device for actuating the same, a third hydraulic motor connected to said magnetic separating roll for driving the same and the first mentioned conveyor belt, a fourth hydraulic motor connected to said second conveyor for moving the same and a fifth hydraulic motor connected to said third conveyor for moving the same, hydraulic piping interconnecting said source of fluid pressure and said hydraulic motors individually and throttle valves controlling fluid pressure flow through said piping whereby said hydraulic motors may be individually controlled by the individual manipu-lation of said throttle valves.

2. The portable slag beneficiating plant set forth in Claim 1 and wherein said second grizzly is arranged to separate metallic pieces into at least three size ranges, said third conveyor belt positioned to receive one of said three size ranges of metallic pieces and convey them to a point spaced with respect to said second grizzly.

3. The portable slag beneficiating plant set forth in Claim 1 and wherein said first and second grizzlys include spaced bars, vertical vanes on the bars of said first grizzly, the bars of the second grizzly being wider and hence more closely spaced at their ends beneath said magnetic separator roll with respect to their opposite ends.

4. The portable slag beneficiating plant set forth in Claim 1 and wherein said throttle valves are positioned in a group at a location on said plant from which the feed hopper, the grizzlys and the magnetic separator roll are visible.

5. The portable slag beneficating plant set forth in Claim 1 and wherein said conveyor belt extends from a point below said first grizzly on an incline upwardly to said magnetic separating roll.