CA1311918C - Lance for treating molten metal - Google Patents
Lance for treating molten metalInfo
- Publication number
- CA1311918C CA1311918C CA000582455A CA582455A CA1311918C CA 1311918 C CA1311918 C CA 1311918C CA 000582455 A CA000582455 A CA 000582455A CA 582455 A CA582455 A CA 582455A CA 1311918 C CA1311918 C CA 1311918C
- Authority
- CA
- Canada
- Prior art keywords
- metal tube
- metal
- lance
- smaller
- refractory body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A lance for use in treating a bath of molten metal comprises an elongated tubular refractory body. A metal tube is positioned axially in the refractory body, a plurality of smaller metal tubes are positioned in the metal tube, some of the plurality of smaller metal tubes are arranged in side by side relation in a spiral pattern in engagement with said metal tube in a section of said metal tube extending inwardly from one end thereof, there is an apertured partition in said metal tube, and the smaller metal tubes engage the apertures in said partition so as to communicate with a chamber on the other side of said partition. A refractory core is positioned in the metal tube mechanically locking the plurality of smaller metal tubes in the spiral pattern. A device engages the metal tube and extends outwardly of the tubular refractory body so as to support the lance and is connected with a source of gas to be directed through the lance.
A lance for use in treating a bath of molten metal comprises an elongated tubular refractory body. A metal tube is positioned axially in the refractory body, a plurality of smaller metal tubes are positioned in the metal tube, some of the plurality of smaller metal tubes are arranged in side by side relation in a spiral pattern in engagement with said metal tube in a section of said metal tube extending inwardly from one end thereof, there is an apertured partition in said metal tube, and the smaller metal tubes engage the apertures in said partition so as to communicate with a chamber on the other side of said partition. A refractory core is positioned in the metal tube mechanically locking the plurality of smaller metal tubes in the spiral pattern. A device engages the metal tube and extends outwardly of the tubular refractory body so as to support the lance and is connected with a source of gas to be directed through the lance.
Description
LANCE FOR TREATING MOLTEN ~ETAL
Back~round of the Invention Technical Field:
This invention relates to lances such as used for introducing an inert gas into molten metal for stirring the same or for inject-ing a stream of oxygen into molten metal for refining the same.
Descri~tion of the Prior Art:
Lances for introducing gases into molten metal for various pur-poses are disclosed in U.S. Patent Nos. 3,379,428 of 4t23/68 to A.T.
Dortenzo, et al. and 3,082,997 of March, 26, 1963 to E.F. Kurzinski which disclose immersion lances formed of straight metal tubes forming a plurality of gas conduits arranged to direct gas down-wardly into the molten emtal in which the lance is positioned.
U.S. Patent Nos. 3,645,520 of February 29, 1972 to T.R. Acre, et al. and 3,898,078 of Aug. 25, 1975 to R.A. Huber disclose lances in which the gas conveying conduits are formed in several patterns, the patent 3,645,520 providing an axial metal conduit around which several tubes are spirally wound and encases in an exterior housing which may be a protective refractory. Alternate forms of the dis-close position the metal tubes in varied patterns and surrounds them with a refractory body and one such form adds an exterior housing, party metal and partly refractory. Patent 3,898,078 forms the lance of a pair of tubular members, one positioned within the other, -1- ~
.".a_, ..,~.... ," .. ... . . .
131 ~91~
with the inner tubuular member having a relatively thick end portion in which helical passageways are formed so that gas introduced into an area between the tubular members will flow through the helical passage-ways which communicate with the delivery end of the lance. The lower portion of this end of the lance is covered with a suitable refractory.
U.S. Patents 4,389,245 of June 21, 1983 to Blair, et al. and 4,550,898 of Nov. 5, 1985 to M.D. LaBate, II disclose lances having straight gas conveying conduits therein and refractory housings of cylindrical cross section thereabout and U.S. Patent 4,588,170 of May 13, 1986 to J.A. Towns discloses a lance which is primarily an elongated refractory body having a tubular gas conduit extending longitudinally thereof and terminating inwardly of the ends thereof in a cavity opening outwardly.
The present invention relates to a substantially improved lance ~or treating molten metal in which the principal body of the lance ls ~ormed of refractory material with a bore in which a metal tube is posltloned and in which metal tube a plurality of smaller metal tubes in a spirally wound pattern through some of their lengths are positioned so as to engage the inner surface of the larger metal tube. A refractory core formed therein mechanioally locks the smaller tubes in desired position whereby their open ends at the delivery end of the lance provide a tangential flow of gas causing a circular '' ' ~
.
.
` 131 1918 stirring motion in the molten metal. The novel construction of the elongated refractory body and its relatively small bore axially thereof in which the smaller metal tubes are positioned and held by the refractory core enables the lance to be effectively used in introducing gas into molten metal and contributes to its substantially longer life than has heretofore been possible with the prior art lances.
Summarv of the Invention A lance for treating molten metal by introducing inert gas for stirring or for injecting oxygen or another gas into molten metal or slag has an elongated refractory body with a relatively small bore axially thereof defined by a metal tube which in turn is largely fllled with a refractory core which serves to position a plurality of smaller metal tubes which extend longitudinally of the bore ~5 and a section of which metal tubes are arranged in a spirally wound pattern and held in locked position against the inner surface of the metal tube by the refractory core. A secondary metal tube positioned in the bore and extending outwardly thereof at the opposite end of the lance with respect to the spirally wound pattern of the smaller metal tubes communicates with the smaller metal tubes and with fittings ., :. .. . .
' ' secured thereto by which the lance may be supported and moved and through which gas supply for the lance is directed.
Descri~tion of the Drawin~s Figure 1 is a vertical section through the lance with parts broken away so as to illustrate the construction thereof;
Figure 2 is an end elevation on line 2-2 of Figure l; and Figure 3 is a cross section on line 3-3 of Figure 1.
Descri~tion of the Preferred Embodiment In the form of the invention illustrated and described herein the lance for treating molten metal comprises an elongated relatively thick walled preferably cross sectionally circular tubular refractory body 10 having a tip or delivery end 11 and a supply end 12. An axial bore is defined longitudinally of the tubular refractory body 10 by a first metal tube 13 which is substantially smaller in diameter than the diameter of the tubular refractory body 10, the first metal tube 13 extending to the tip or delivery end 11 of the lance, A second metal tube 14 is joined to the first metal tube 13 by a coupling 15 inwardly of the supply end 12 of the lance and a third metal tube 16 preferably square in cross section is posi-tioned over the second metal tube 14 and extends therewith outwardlyof the supply end 12 of the lance and carries a pair of fittings 17 ,,,, . .,., ~
-- .
- ': ' 18 respectively. A partition 19 is positioned in the ~irst metal tube 13 adjacent the inner end thereof which is located in the coupling 15 and a plurality of apertures in the partition 19 communicate with a plurality of small metal tubes 20. The small metal tubes 20 extend from the apertures in the partition 19 toward the tip or delivery end 11 of the lance and inwardly of the end thereof are formed in a plurality of spirally wrapped patterns in side by side relation to one another so that each of the plurality of smaller tubes 20 is in continuous contact with the inner surface of the first metal tube 13 and so that all of the smaller metal tubes in the spirally wrapped pattern form a continuously extending circular lining in the first metal tube 13 with each of the smaller metal tubes 20 in side by side relation and at the tip or delivery end 11 of the lance define a plurality of openings arranged in a circular pattern from which the smaller metal tubes extend inwardly of the lance in angular relation so that gas flowing through the smaller metal tubes:is delivered into the molten metal in which the lance is positioned from the approximate center thereof and directed out-wardly therefrom in a plurality of tangential patterns which act to most effectively stir the molten metal and/or introduce a refining gas such as oxygen thereinto in a unique stirring action.
The tip or delivery end 11 of the lance is illustrated in Figure 2 of the drawings and by referring thereto and Figure 1 of the drawings it will be seen that a refractory core 21 fills the first metal tube 13 from the end 11 of the lance to the partition 1~ here-tofore referred to, the refractory core 21 being cast in position to provide a mechanically locking engagement with the spirally wound smaller tuber 20 and continues through the section of the lance in which the smaller metal tubes 20 are positioned circumferentially in the first metal tube 13.
As illustrated in Figures 1 and 2 of the drawings, the smaller metal tubes 20 through which the desired gas is conveyed through the lance are each formed in a flattened oval shape of a desirable configuration forming a smaller passageway so that a lance so formed can match any desired discharge of gas into the molten metal. For example gas supplied at 300 lbs. per square inch can be desirably dlscharged at a reduced rate of 200 feet per minute by preshaping the flattened oval shapes of the smaller tubes 20 to a predetermined shape. For example wherein the diameter of the small metal tube ls a quarter inch od. is flattened to an increased width of 5/16th oi an lnch to form a flattened discharge orifice of ,026/lOOths oi an inch by .26 in width.
, ,,:, . . . . . .
It will occur to those skilled in the art that lances formed in accordance with this invention may be easily custom formed for use in converters as well as ladles in which the molten metal being treated is positioned.
By referring to Figures 1 and 3 of the drawings~ it will be seen that the preferably squared metal tube 16 heretofore referred to is attached to a second metal tube 14 by way of a collar 22 and is of a size so that it is spaced with respect to the secondary metal tube 14 at a point beyond the supply end 12 of the lance. The 10 fitting 17 is secured to the tube 16 and it in turn carries attach-ment links 23 to which chains may be affixed for supporting and/or moving the lance. The tube 16 is attached at its outer end to a fitting 18 which forms a coupling through which gas, which may include additives as known in the art, may be introduced into the lance for 15 injection into the molten metal.
By rei'erring again to Figure 1 of the drawings, it will be seen that metal reinforcing members 24 and 25 are attached to the first metal tube 13 and to the coupling 15 and third metal tube 16 and extend into the tubular refractory body 10 in desired configuration 20 and by re~erring to Figures 1 and 2 of the drawings, it will be seen that the outer diamter of the tubular refractory body 10 is approxi-mately four times the outer diameter of the first metal tube 13 which defines the bore therein so as to insure a desired wall thickness at least double the cross sectional area of the bore.
The device is simply and easily formed and is possessed of an unusually long life as compared with the prior art lances due to the novel and highly efficient arrangement and relation of the tubular refractory body 10 and the refractory core 21 to the metal tubes 13 and 20 therein. I
Those skilled in the art will observe that the structure of the lance hereinbefore described can be shortened and used effectively as a bottom stirring gas blowing tuyere.
Although but one embodiment of the present invention has been illustrated and described, it will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit of the invention and having thus described my invention what I claim ls:
. ,, :
Back~round of the Invention Technical Field:
This invention relates to lances such as used for introducing an inert gas into molten metal for stirring the same or for inject-ing a stream of oxygen into molten metal for refining the same.
Descri~tion of the Prior Art:
Lances for introducing gases into molten metal for various pur-poses are disclosed in U.S. Patent Nos. 3,379,428 of 4t23/68 to A.T.
Dortenzo, et al. and 3,082,997 of March, 26, 1963 to E.F. Kurzinski which disclose immersion lances formed of straight metal tubes forming a plurality of gas conduits arranged to direct gas down-wardly into the molten emtal in which the lance is positioned.
U.S. Patent Nos. 3,645,520 of February 29, 1972 to T.R. Acre, et al. and 3,898,078 of Aug. 25, 1975 to R.A. Huber disclose lances in which the gas conveying conduits are formed in several patterns, the patent 3,645,520 providing an axial metal conduit around which several tubes are spirally wound and encases in an exterior housing which may be a protective refractory. Alternate forms of the dis-close position the metal tubes in varied patterns and surrounds them with a refractory body and one such form adds an exterior housing, party metal and partly refractory. Patent 3,898,078 forms the lance of a pair of tubular members, one positioned within the other, -1- ~
.".a_, ..,~.... ," .. ... . . .
131 ~91~
with the inner tubuular member having a relatively thick end portion in which helical passageways are formed so that gas introduced into an area between the tubular members will flow through the helical passage-ways which communicate with the delivery end of the lance. The lower portion of this end of the lance is covered with a suitable refractory.
U.S. Patents 4,389,245 of June 21, 1983 to Blair, et al. and 4,550,898 of Nov. 5, 1985 to M.D. LaBate, II disclose lances having straight gas conveying conduits therein and refractory housings of cylindrical cross section thereabout and U.S. Patent 4,588,170 of May 13, 1986 to J.A. Towns discloses a lance which is primarily an elongated refractory body having a tubular gas conduit extending longitudinally thereof and terminating inwardly of the ends thereof in a cavity opening outwardly.
The present invention relates to a substantially improved lance ~or treating molten metal in which the principal body of the lance ls ~ormed of refractory material with a bore in which a metal tube is posltloned and in which metal tube a plurality of smaller metal tubes in a spirally wound pattern through some of their lengths are positioned so as to engage the inner surface of the larger metal tube. A refractory core formed therein mechanioally locks the smaller tubes in desired position whereby their open ends at the delivery end of the lance provide a tangential flow of gas causing a circular '' ' ~
.
.
` 131 1918 stirring motion in the molten metal. The novel construction of the elongated refractory body and its relatively small bore axially thereof in which the smaller metal tubes are positioned and held by the refractory core enables the lance to be effectively used in introducing gas into molten metal and contributes to its substantially longer life than has heretofore been possible with the prior art lances.
Summarv of the Invention A lance for treating molten metal by introducing inert gas for stirring or for injecting oxygen or another gas into molten metal or slag has an elongated refractory body with a relatively small bore axially thereof defined by a metal tube which in turn is largely fllled with a refractory core which serves to position a plurality of smaller metal tubes which extend longitudinally of the bore ~5 and a section of which metal tubes are arranged in a spirally wound pattern and held in locked position against the inner surface of the metal tube by the refractory core. A secondary metal tube positioned in the bore and extending outwardly thereof at the opposite end of the lance with respect to the spirally wound pattern of the smaller metal tubes communicates with the smaller metal tubes and with fittings ., :. .. . .
' ' secured thereto by which the lance may be supported and moved and through which gas supply for the lance is directed.
Descri~tion of the Drawin~s Figure 1 is a vertical section through the lance with parts broken away so as to illustrate the construction thereof;
Figure 2 is an end elevation on line 2-2 of Figure l; and Figure 3 is a cross section on line 3-3 of Figure 1.
Descri~tion of the Preferred Embodiment In the form of the invention illustrated and described herein the lance for treating molten metal comprises an elongated relatively thick walled preferably cross sectionally circular tubular refractory body 10 having a tip or delivery end 11 and a supply end 12. An axial bore is defined longitudinally of the tubular refractory body 10 by a first metal tube 13 which is substantially smaller in diameter than the diameter of the tubular refractory body 10, the first metal tube 13 extending to the tip or delivery end 11 of the lance, A second metal tube 14 is joined to the first metal tube 13 by a coupling 15 inwardly of the supply end 12 of the lance and a third metal tube 16 preferably square in cross section is posi-tioned over the second metal tube 14 and extends therewith outwardlyof the supply end 12 of the lance and carries a pair of fittings 17 ,,,, . .,., ~
-- .
- ': ' 18 respectively. A partition 19 is positioned in the ~irst metal tube 13 adjacent the inner end thereof which is located in the coupling 15 and a plurality of apertures in the partition 19 communicate with a plurality of small metal tubes 20. The small metal tubes 20 extend from the apertures in the partition 19 toward the tip or delivery end 11 of the lance and inwardly of the end thereof are formed in a plurality of spirally wrapped patterns in side by side relation to one another so that each of the plurality of smaller tubes 20 is in continuous contact with the inner surface of the first metal tube 13 and so that all of the smaller metal tubes in the spirally wrapped pattern form a continuously extending circular lining in the first metal tube 13 with each of the smaller metal tubes 20 in side by side relation and at the tip or delivery end 11 of the lance define a plurality of openings arranged in a circular pattern from which the smaller metal tubes extend inwardly of the lance in angular relation so that gas flowing through the smaller metal tubes:is delivered into the molten metal in which the lance is positioned from the approximate center thereof and directed out-wardly therefrom in a plurality of tangential patterns which act to most effectively stir the molten metal and/or introduce a refining gas such as oxygen thereinto in a unique stirring action.
The tip or delivery end 11 of the lance is illustrated in Figure 2 of the drawings and by referring thereto and Figure 1 of the drawings it will be seen that a refractory core 21 fills the first metal tube 13 from the end 11 of the lance to the partition 1~ here-tofore referred to, the refractory core 21 being cast in position to provide a mechanically locking engagement with the spirally wound smaller tuber 20 and continues through the section of the lance in which the smaller metal tubes 20 are positioned circumferentially in the first metal tube 13.
As illustrated in Figures 1 and 2 of the drawings, the smaller metal tubes 20 through which the desired gas is conveyed through the lance are each formed in a flattened oval shape of a desirable configuration forming a smaller passageway so that a lance so formed can match any desired discharge of gas into the molten metal. For example gas supplied at 300 lbs. per square inch can be desirably dlscharged at a reduced rate of 200 feet per minute by preshaping the flattened oval shapes of the smaller tubes 20 to a predetermined shape. For example wherein the diameter of the small metal tube ls a quarter inch od. is flattened to an increased width of 5/16th oi an lnch to form a flattened discharge orifice of ,026/lOOths oi an inch by .26 in width.
, ,,:, . . . . . .
It will occur to those skilled in the art that lances formed in accordance with this invention may be easily custom formed for use in converters as well as ladles in which the molten metal being treated is positioned.
By referring to Figures 1 and 3 of the drawings~ it will be seen that the preferably squared metal tube 16 heretofore referred to is attached to a second metal tube 14 by way of a collar 22 and is of a size so that it is spaced with respect to the secondary metal tube 14 at a point beyond the supply end 12 of the lance. The 10 fitting 17 is secured to the tube 16 and it in turn carries attach-ment links 23 to which chains may be affixed for supporting and/or moving the lance. The tube 16 is attached at its outer end to a fitting 18 which forms a coupling through which gas, which may include additives as known in the art, may be introduced into the lance for 15 injection into the molten metal.
By rei'erring again to Figure 1 of the drawings, it will be seen that metal reinforcing members 24 and 25 are attached to the first metal tube 13 and to the coupling 15 and third metal tube 16 and extend into the tubular refractory body 10 in desired configuration 20 and by re~erring to Figures 1 and 2 of the drawings, it will be seen that the outer diamter of the tubular refractory body 10 is approxi-mately four times the outer diameter of the first metal tube 13 which defines the bore therein so as to insure a desired wall thickness at least double the cross sectional area of the bore.
The device is simply and easily formed and is possessed of an unusually long life as compared with the prior art lances due to the novel and highly efficient arrangement and relation of the tubular refractory body 10 and the refractory core 21 to the metal tubes 13 and 20 therein. I
Those skilled in the art will observe that the structure of the lance hereinbefore described can be shortened and used effectively as a bottom stirring gas blowing tuyere.
Although but one embodiment of the present invention has been illustrated and described, it will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit of the invention and having thus described my invention what I claim ls:
. ,, :
Claims (7)
1. A lance for use in treating a bath of molten metal compris-ing an elongated tubular refractory body, a metal tube positioned axially in said elongated tubular refractory body, a plurality of smaller metal tubes positioned longitudinally in said metal tube, a portion of said plurality of smaller metal tubes being arranged in side by side relation in a spiral pattern in engagement with said metal tube throughout a section of said metal tube extending inwardly from one end thereof, an apertured partition in said metal tube, said smaller metal tubes engaging the apertures in said partition on one side thereof so as to communicate with a chamber on the other side of said partition, a refractory core in said metal tube between said partition and said one end thereof mechanically locking said plurality of smaller metal tubes in said pattern,. means engaging said metal tube and extending outwardly of one end of said tubular refractory body by which said lance may be supported and connected with a source of gas to be directed therethrough.
2. The lance for use in treating a bath of molten metal set forth in claim 1 and wherein each of said plurality of smaller metal tubes in said portion thereof arranged in side by side relation in a spiral pattern is partially flattend to form a smaller passageway so as to reduce the volume of gas directed therethrough.
3. The lance for use in treating a bath of molten metal set forth in claim 1 wherein said means engaging said metal tube includes a coupling and a secondary metal tube defining said chamber on the other side of said partition.
4. The lance for use in treating a bath of molten metal set forth in claim 1 wherein said means engaging said metal tube includes a coupling and a secondary metal tube defining said chamber on the other side of said partition and wherein a third metal tube larger than said secondary metal tube is positioned thereover and secured thereto and fittings are attached to said third metal tube and said secondary metal tube outwardly of said one end of said tubular refractory body.
5. The lance for use in treating a bath of molten metal set forth in claim 1 and wherein said metal tube positioned axially in said elongated tubular refractory body is cross sectionally circular and wherein said plurality of smaller metal tubes positioned longitudinally therein are arranged in a circular pattern registering with said cross sectionally circular metal tube whereby gas directed through said smaller metal tubes enters said molten metal in a plurality of tangential paths.
6. The lance for use in treating a bath of molten metal set forth in claim 1 and wherein said metal tube positioned axially in said elongated tubular refractory body is of a diameter and wherein said elongated tubular refractory body is of a diameter at least four times said diameter of said metal tube whereby gas directed through said plurality of smaller metal tubes flows in tangential paths extending outwardly across an end of said elongated tubular refractory body in an improved stirring and mixing pattern in said molten metal.
7. The lance for use in treating a bath of molten metal set forth in claim 1 and wherein said elongated tubular refractory body has an axial bore therethrough registering with said metal tube and wherein said bore is of a diameter and wherein the wall thickness of said elongated tubular refractory body is at least double the diameter of said bore.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000582455A CA1311918C (en) | 1988-11-07 | 1988-11-07 | Lance for treating molten metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000582455A CA1311918C (en) | 1988-11-07 | 1988-11-07 | Lance for treating molten metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1311918C true CA1311918C (en) | 1992-12-29 |
Family
ID=4139065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000582455A Expired - Fee Related CA1311918C (en) | 1988-11-07 | 1988-11-07 | Lance for treating molten metal |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1311918C (en) |
-
1988
- 1988-11-07 CA CA000582455A patent/CA1311918C/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |