US2872180A - Apparatus for adding solid material to molten metal - Google Patents

Description

R. TlETlG, JR., ET AL 2,872,180

Feb. 3, 1959 APPARATUS FOR ADDING SOLID MATERIAL TO MOLTEN METAL Filed Feb. 25, 1957 5 Sheets-Sheet 1 I/ I I 5 INV ENT ORS- wwk Q flamdllallmgwifi; 9 W

Feb. 3, 1959 R. TlETlG, JR., ET AL 2,872,180

APPARATUS FOR ADDING SOLID MATERIAL TO MOLTEN METAL Filed Feb. 25, 1957 5 Sheets-Sheet 2 Feb- 3 R. JR" ETAL APPARATUS FOR ADDING SOLID MATERIAL TO MOLTEN METAL 3 Sheets-Sheet 3 Filed Feb. 25, 1957 MW %Q Q w m nhwl l A: 1 1

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FOR ADDING SOLID MATERIAL T MOLTEN METAL Application February 25, 1957, Serial No. 642,291

3 Claims. .(Cl. 266-34) APPARATUS This invention relates to a new and improved appa- Patent 1O ratus for adding predetermined quantifies of solid ma- J In the manufacture of steel, it is customary to add certain additional materials such, for example, as alloys of manganese, and the steel is made to quite specific re- :quirements as to the percentages of such additional materials. The specification of such additional materials requires that they be uniformly distributed throughout a heat which may comprise many tons of metal. Such additions are also often quite costly and any method of adding the materials must avoid waste of the materials if the method is to be of practical commercial importance.

. Additions have heretofore been made both in the furtrace and in the ladle. Both methods have resulted in substantial losses of valuable alloying materials in the slag. Additions to the ladle have comprised the manual shoveling of the material into the ladle or throwing of the material into the ladle in bags. Both such methods result in somewhat irregular additions and results.

When material is added in unregulated quantities and in relatively large amounts at spaced time intervals with large quantities entering the ladle in a short period of time, alloying materials are lost and non-uniform steel ,results. For example, some of the material may float .on top of the molten steel and be lost in the slag. Also,

there may be localized freezing of the molten metal with non-uniform distribution of the alloying materials.

When the material is added in the furnace there are substantial losses in the slag. -It is an object of the present invention to provide new materials to molten metal.

It is an additional object to provide such apparatus and methods adapted for use in supplying alloying materials to molten steel as it is discharged from a furnace into a ladle.

It is a further object to provide a means and method from a furnace into a ladle and wherein the. rate of feed can be so regulated that each increment of liquid, flow and improved apparatus and methods for supplying solid will'essentially consist of vibrating mechanism for agitating a feeding pan at a variable rate but capable of mg ulation, however, so that the flow of alloying materials can be proportioned to that of the molten metal.

It is another object to provide apparatus and methods adapted for commercial use in the production of steel.

Other and further objects will appear as the description proceeds.

We have shown certain preferred embodiments of the apparatus for carrying out our invention in the accompanying drawings, in which- Figure 1 is a side elevation of the apparatus; 7

Figure 2 is an end view of the apparatus as seen from the right of Figure 1; and

Figure 3 is a plan view of the apparatus with the hopper removed to show the lower construction;

, The apparatus comprises a frame having vertical members 11, horizontal bracing members 13 and upper horizontal members 14, the frame being supported on a base 15. This base 15 is provided with stub shafts 17 carrying rollers 18. These rollers ride on thespaced parallel rails 20 which may be supported on any suitable structure, not shown. The upper members 14 of the frame sunpport the hopper 22 having a central bottom opening 24. A material guide chute 26 is provided with a sloping rear member 28 and lateral members 30 to direct material from the hopper 22 on to the vibrating feeder pan 32.,

This feeder pan 32 is supported from the frame by means of the U-shaped members 34, suspension rods 36, and support eyes 38, which extend through the front cars 42 and the rear ears 44. The suspension is cushioned by springs 46. The front cars 42 are secured to the feeder pan 32, while the rear ears 44 are secured to the vibrating mechanism 48 which is connected to the underside of the pan 32 by the bracket assembly 50.

The cross member 52 is welded or otherwise secured to the supports for the rails 20 below the forward end of these rails. This cross member 52 is connected by air actuated cylinders 54 to the rear cross member 55 of the bottom frame support 15, as shown at 56. The arms 58 extend forwardly from the cross frame members 52 and carry the roller 60 which extends transversely of the frame. The discharge chute 62 is pivotally supported by brackets 64 from the forward ends of the frame members 15. An adjustment may be provided in this pivoted connection so that the chute may be moved laterally to the correct horizontal positioning relative to the furnace spout. Once established, this adjustment need not bechanged. As shown in Figure 2, this chute 62 I -7 1,'which feeds directly to the feeder pan 32.

is brought into contact with a desired and predetermined 7 Y quantity of the alloying material.

, Another object is to provide improved mechanical metal into the ladle and wherein said mechanical means i In operation of the apparatus, the hopper and its supporting frame are moved backw'ardly and forwardly on rollers 18 which roll on track 20 by means of the air actuated, remotely controlled, cylinders 54. Admitting air into the right end of these cylinders moves the frame and the entire assembly supported thereby to the left, as seen in Figure 1. Theroller 60, supporting the chute 62, is fired in relation to the track 29 so that as th'e'assembly is moved to the left, the chute 62 pivots about its supporting brackets 64 and its outer or discharge end is raised as well as being moved to the'left to clear the ladle 69. The exact inclination of the chute 62 and s position relative to theladle may be-varied 'by control of the air cylinders 54.

'as'raiso r r The material to be added to the ladle is placed in the hopper 22 and said hopper may be of a size to contain a measured quantity of said material, or indicia could be provided on the side wall of thehopper such that the operator may accurately acertain the quantity when the hopper is not completely full. The material must be granular in form and should not have lumps exceeding about two and one-half inches in diameter. It will be understood that said material will pass down through the hopper opening 24 so that the lower portion of the pile of contained material will rest on the vibrating feeder pan 32. Of course the material is restrained against lateral and rearward movement by the walls 28 and 30, and its angle of repose will be such that the material resting on pan 32 will not fiow over the discharge end of the pan. When it is desired to discharge the material, the vibrator 43 is placed in operation and the vibration of the inclined pan 32 will cause a flow of material to take place over the dis charge end of the pan and into the chute 62 where it will flow by gravity to discharge from the lower end 66 of the chute into the ladle 69.

The inclined pan 32 may be considered as forming the bottom of the hopper and said pan is given any desired form of vibrating or reciprocating movement such as will produce a discharge of the discrete materials into the chute 62 and wherein said discharge can be regulated by regulation of the vibrating or reciprocating movement. The vibrating mechanism 48 is preferably of the electrical type with variation in rate of feed being attained by voltage control of the power current supplied to the mechanism. Accordingly rate of feed can conveniently be adjusted manually by turning a small hand wheel on a control panel. Also it is desirable to have said rate of feed variable over a wide range. For example, the vibrating mechanism 48 should be capable of regulation so as to add ten thousand (10,000) pounds of material such as manganese in three minutes or three thousand (3000) pounds in twenty minutes or even longer.

The discharge end 66 of the chute should be located close to the stream of metal leaving the tapping spout of the furnace and entering the ladle. Thus the material falling from the chute will meet the molten steel in the ladle at the same point as the steel falling from the tapping spout meets the body of molten steel. This will result in a better mixing of the solid material being added to the molten metal than if the material were introduced at other points into the ladle. The center line of the tapping spout, as clearly shown in Figure 3, is not located along the center line of the ladle. The ladle is either circular or oval and therefore the tangential introduction of the molten steel into the ladle causes a swirling motion of the steel in the ladle, the solid material being added at a point of introduction of the steel flow into the swirl. This swirling movement gives a very effective mixing of the material with the molten metal. The exact horizontal position of the chute will be determined by the operator by means of the air cylinder 54, and once established it does not require to be changed during the discharge of material.

After the apparatus is in position for adding materials to the ladle and a small quantity of the steel has fallen into the ladle, the vibrating mechanism 48 is started by remote control. The rate of vibration and correspondingly the rate of flow of material is remotely controlled and adjusted to correspond with the rate of flow of the molten steel from the furnace. All additions should be completed and the feeder vibrator 48 stopped by the time the ladle is about eighty percent full. This will allow time to retract the apparatus from the ladle so as to prevent the discharge end 66 of the chute from being damaged by molten steel or slag in the ladle. It also allows the last of the material fed into the ladle to be thoroughly mixed by the continued swirling action of the last metal introduced into the ladle.

The method and apparatus of the present invention have 4 numerous advantages, both direct and indirect, over prior methods and apparatus for making open hearth steel ladle additions.

The rate of adding the solid materials to the ladle can be varied to correspond to the rate of flow out of the furnace. Not only is the solid material added to the molten steel in the ladle simultaneously, gradually and continuously, but also at a regulated rate in accordance with the rate of flow of steel into the ladle so that each increment of molten steel is brought into intimate contact with exactly the desired amount of solid addition. If the rate of addition is not regulated, then a large quantity of material entering in a short period of time may result in some of the material floating on top of the molten steel and being lost in the slag, or there may be localized freezing of the molten metal. The possibilities of materials floating or of localized freezing are greatly reduced if the solid materials are added over a considerable part of the time that molten steel is flowing into the ladle. Another important advantage is being able to make larger additions to the ladle. As a result, larger recovery of certain materials, principally the alloys of manganese, will be obtained in the steel if those materials are added to the steel in the ladle rather than to steel in the open hearth furnace. For example, it has been ascertained that the recovery of manganese when added to the ladle is about ten percent greater than when added to the furnace. Another impor- 'tant advantage is that a narrower manganese specification is possible. In other words, manganese additions can be calculated about 0.05 point lower than if some or all are added to the furnace.

This application is a continuation-in-part of our copencling application, Serial No. 397,450, filed December 10, 1953 and entitled Method and Apparatus for Adding Solid Material to Molten Metal, now abandoned.

While we have shown and described certain preferred methods and apparatus for carrying out our invention, these are to be understood to be illustrative only as they are capable of variation to meet differing conditions or requirements. We therefore contemplate such modifications as come within the spirit and scope of the appended claims.

What is claimed is:

1. Apparatus for adding solid material to molten metal in a. ladle as the metal is poured into the ladle, which comprises apparatus movably supported for movement toward and from the ladle and including a hopper, feeder pan below the hopper, means for vibrating the feeder pan, a discharge chute having a material-receiving end and a discharge end and adapted to extend in inclined material-leading position between the feeder pan and the ladle and to be retracted from such inclined material-leading position, means on the apparatus pivotally supporting the material-receiving end of the discharge chute, a roller supporting the discharge chute intermediate its material-receiving end and its discharge end, the said means being movable toward and away from said roller whereby the discharge end of the discharge chute may be extended into and withdrawn from the ladle and the inclination of the chute may be varied.

2. Apparatus for adding solid material to molten metal in a ladle, in combination with fixed tracks for supporting the apparatus, said apparatus including a frame having supporting rollers engaging the tracks, a hopper disposed within and supported by the frame, said hopper having an open bottom, a feeder pan supported below the open bottom of the hopper, means for vibrating the feeder pan, a discharge chute pivotally connected to the frame at the forward end thereof and extending forwardly and downwardly from the feeder pan, expansion cylinders connected at one end to the frame and at their other end to a fixed support adjacent the tracks, whereby said cylinders provide power means for moving the frame along the tracks, and other means operating to swing the 5 chute upwardly toward the horizontal due to movement of the frame rearwardly along the tracks.

3. Apparatus for adding-solid material to molten metal in a ladle, in combination with fixed tracks for support ing the apparatus, said apparatus including a frame having supporting rollers engaging the tracks and adapted to have rolling movement thereon, a hopper disposed within and supported by said frame, said hopper having an open bottom, a feeder pan supported :by the frame below the open bottom of the hopper, means for vibrating the feeder pan, a discharge chute pivotally connected to the frame at the forward end thereof and extending forwardly and downwardly from the feeder pan, expansion cylinders connected at one end to the frame and at their other end to a fixed support, whereby the cylinders provide power means for moving the frame along the tracks, and an intermediate fixed support for the chute positioned for contact with the undersurface of the chute and providing for bodily movement of the chute with respect thereto, whereby the chute is swung upwardly about its pivot due to movement of the frame rearwardly along the tracks.

References Cited in the file of this patent UNITED STATES PATENTS 755,632 Dempcy Mar. 29, 1904 810,605 Baldwin Jan. 23, 1906 1,916,262 Good July 4, 1933 2,266,372 Manierre Dec. 16, 1941 2,528,867 Day Nov. 7, 1950 2,539,070 Gebo Jan. 23, 1951 2,715,064 Burns Aug. 9, 1955 2,770,351 Curioni Nov. 13, 1956 OTHER REFERENCES ABC of Iron and Steel (6th ed.), Reebel Penton Publishing Co. (1950), page 96.

The Making, Shaping and Treating of Steel (5th ed.), Camp and Francis, published by Carnegie-Illinois Steel 20 Corp., pages 417-419.

Claims (1)

1. APPARATUS FOR ADDING SOLILD MATERIAL TO MOLTEN METAL IN A LADLE AS THE METAL IS POURED INTO THE LADLE, WHICH COMPRISES APPARATUS MOVABLE SUPPORTED FOR MOVEMENT TOWARDS ANSD FROM THE LADLE AND INCLUDING A HOPPER, FEEDER PAN, BELOW THE HOPPER, MEANS FOR VIBRATING THE FEEDER PAN, A DI-SCHARGE CHUTE HAVING A METERIAL-RECEIVING END AND A DISCHASRGE END AND ADAPTED TO EXTEND IN INCLINED MATERIAL-LEADING POSITION BETWEEN THE FEEDER PAN AND THE LADLE AND TO BE RETRACTED FROM SUCH INCLINED MATERIAL-LEADING POSITIO, MEANS ON THE APPARATUS PIVOTALLY SUPPORTING THE MATERIAL-RECEIVING END OF THE DISCHARGE CHUTE, A ROLLER SUPPORTING THE DISCHARGE CHUTE INTERMEDIATE ITS MATERIAL-RECEIVING END AND ITS DISCHARGE END THE SAID MEANS BEING MOVABLE TOWARDS AND AWAY FROM SAID ROLLER WHEREBY THE DISCHARGE END OF THE DISCHARG CHUTE MAY BE EXTENDED INTO AND WITHDRAWN FROM THE LADLE AND THE INCLINATION OF THE CHUTE MAY BE VARIED

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