US3380727A - Devices for introducing gas into a metal melt - Google Patents

Devices for introducing gas into a metal melt Download PDF

Info

Publication number
US3380727A
US3380727A US517219A US51721965A US3380727A US 3380727 A US3380727 A US 3380727A US 517219 A US517219 A US 517219A US 51721965 A US51721965 A US 51721965A US 3380727 A US3380727 A US 3380727A
Authority
US
United States
Prior art keywords
pipe
gas
cap
vessel
melt
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 - Lifetime
Application number
US517219A
Inventor
Ruttiger Karl
Diener Arnulf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dortmund Hoerder Huettenunion AG
Original Assignee
Dortmund Hoerder Huettenunion AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dortmund Hoerder Huettenunion AG filed Critical Dortmund Hoerder Huettenunion AG
Application granted granted Critical
Publication of US3380727A publication Critical patent/US3380727A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor

Definitions

  • a degasication plant including a vessel to receive the melt to be degasiiied, the vessel having an entry pipe for immersion in a ladle containing the melt, a device for introducing gas into the metal melt through the entry pipe of the degasitication vessel, the device including a gas pipe for supply of gas, the pipe extending through the wall of the entry pipe and having a terminal end on the inner side of the latter and a cap, which is made of refractory porous material, detachably secured to the terminal end of the pipe, the cap projecting inwardly from the wall of the entry pipe and through which the gas is dispersed therein.
  • This invention relates to degasitication of metals and is concerned with a device for introducing gas into a metal melt.
  • the melt to be handled is transferred from a ladle into a degasitication vessel, which is arranged above it, the degasication vessel having in its bottom a pipe, whose lor/er end is immersed in the ladle.
  • a current of gas can be caused to tlow upwards in the pipe.
  • a porous brick can be disposed in the ladle beneath the mouth of the pipe and be connected to a gas supply, or a gas pipe leading into the interior of the pipe is passed through the wall of the latter.
  • the second method mentioned is distinguished by greater constructional simplicity but has the disadvantage that the gas stream bubbles out close to the inner wall of the pipe, which gives rise to considerable erosion of the refractory lining of the pipe.
  • the gas is introduced through a replaceable cap provided on the mouth of the gas inlet pipe, the cap, which is made of porous refractory material, projecting inwardly from the wall of the pipe leading upwardly into the degasication vessel.
  • the cap which is made of porous refractory material, projecting inwardly from the wall of the pipe leading upwardly into the degasication vessel.
  • the cap itself is subject to considerable erosion and other wear, but since it is detachable, this circumstance is not of great importance, because the cap can be readily replaced whereas the replacement of the entire connecting pipe is troublesome and time consuming and constitutes a considerable interruption to operation of the plant.
  • an intermediate threaded spigot piece to which the cap is screwed is disposed between a supply pipe leading to the outside and to the cap. Irrespective of the size (diameter) of the supply pipe this intermediate spigot can be of such dimensions that it provides support for the cap, which would be dilicult to achieve if the cap were to be connected direct to the supply pipe.
  • the spigot piece should also be replaceable, which can best be achieved by connecting to the supply pipe a threaded sleeve, which serves as a fastening for the other end of the spigot piece. If, as may occur, the cap cannot then be detached from the spigot piece, by detaching the latter from the supply pipe the replacement can readily be effected.
  • FIGURE l is a longitudinal section through the entire arrangement
  • FIGURE 2 is a corresponding section on an enlarged scale of the ringed area designated at I in FIGURE 1.
  • FIGURE 1 there is seen in FIGURE 1 the lower part of the wall 1 of a degasication vessel for steel melts, to the bottom opening 2, in which there is connected by means of flanges 3 a pipe 4 open at the bottom.
  • the pipe 4 is made up of a cylindrical steel casing 5, a refractory lining 6 and a refractory jacket 7.
  • the pipe is immersed in a ladle containing the melt, the ladle being situated beneath the vessel.
  • a gas supply pipe 8 terminating in a cap indicated generally at 9.
  • the supply pipe 8 is led from above through the refractory jacket 7, bent inwardly at 11, and connected to the cap 9 by means of an intermediate spigot piece 10 in the manner shown in detail in FIGURE 2.
  • the lining 6 is cut away to provide a recess and seating for the cap and ange 10 of the spigot piece which latter projects obliquely inwards and downwards from the lining 6.
  • the spigot piece 10 in turn is provided at the opposite end with a screw thread 14, by which it is detachably screwed into a counterbore in a sleeve 15, which is joined fast to the supply pipe 8.
  • the incoming gas from the supply pipe 8 flows through the sleeve 15 into an axial bore 16 in the intermediate spigot piece 16, said bore having its outlet at the outer end face of the latter.
  • the gas under pressure, can thus penetrate into the pores of the cap 9 and passes out of the outer surface of the latter.
  • a degasitcation plant comprising a vessel to receive the melt to be degasied, said vessel having an entry pipe for immersion in a ladle containing the melt, a device for introducing gas into the metal melt through the entry pipe of the degasitication vessel, said device comprising a gas pipe for supply of gas, said pipe extending through the wall of the entry pipe and having a terminal end on the inner side of the latter and a cap, which is made of refractory porous material, detachably secured to the terminal end of the pipe, said cap projecting inwardly from the wall of said entry pipe and through which the gas is dispersed therein.
  • a degasication plant comprising a vessel to receive the melt to be degasiiied, said vessel having an entry pipe for immersion in a ladle containing the melt, which pipe includes an outer insulation layer, a device for introducing gas into the metal melt through the entry pipe of the degasication vessel, said device comprising a gas pipe for supply of gas, said pipe extending lengthwise of the insulation layer and having a terminal end on the inside of the pipe and a cap, which is made of refractory porous material, detachably secured to the terminal end of the pipe, said cap projecting inwardly from the wall of said entry pipe and through which lthe gas is dispersed therein.
  • a degasification plant comprising a vessel to receive the melt to be degasitied, said vessel having an entry pipe for immersion in a ladle containing the melt, a device for introducing gas into the metal melt through the entry pipe of the degasification vessel, said device comprising a gas pipe for supply of gas, said gas pipe extending through the wall of the entry pipe and having a terminal end inside the wall of the latter a cap, which is made of refractory porous material, detachably connected to the terminal end of the pipe, the connection between the gas pipe and the cap being by means of an intermediate spigot piece, the spigot piece having a screw thread to receive the cap, said cap projecting inwardly from the wall of the pipe.
  • a device in which the spigot piece is detachably secured at one end t0 the gas supply plpe.
  • a device in which a threaded sleeve is connected to the supply pipe, the spigot piece being detachably secured to the sleeve.

Description

April 30, 1968 K. RTTIGER ET AL 3,380,727
DEVICES FOR INTRODUCING GAS INTO A METAL. MELT Filed Dec. 29, 1965 United States Patent Oftice 3,3%,727 Patented Apr. 30, 1968 3,380,727 DEVICES FR INTRDUCING GAS INT() A METAL MELT Kari Rttiger and Arniilt Diener, Dortmund, Germany,
assignors to Dortmund-Herder Huttenunion Aktiengesellschaft, Dortmund, Germany Filed Dec. 29, 1965, Ser. No. 517,219 Claims priority, application Germany, Jan. 9, 1965,
s claims. (ci. 26e-34) ABSTRACT OF THE DISCLOSURE In a degasication plant including a vessel to receive the melt to be degasiiied, the vessel having an entry pipe for immersion in a ladle containing the melt, a device for introducing gas into the metal melt through the entry pipe of the degasitication vessel, the device including a gas pipe for supply of gas, the pipe extending through the wall of the entry pipe and having a terminal end on the inner side of the latter and a cap, which is made of refractory porous material, detachably secured to the terminal end of the pipe, the cap projecting inwardly from the wall of the entry pipe and through which the gas is dispersed therein.
This invention relates to degasitication of metals and is concerned with a device for introducing gas into a metal melt. In the degasitication of metal melts in vacuo, the melt to be handled is transferred from a ladle into a degasitication vessel, which is arranged above it, the degasication vessel having in its bottom a pipe, whose lor/er end is immersed in the ladle. To assist the ow of the melt from the ladle upwardly through the pipe and into the degasification vessel a current of gas can be caused to tlow upwards in the pipe. In order to introduce the gas ilow, depending on circumstances, either a porous brick can be disposed in the ladle beneath the mouth of the pipe and be connected to a gas supply, or a gas pipe leading into the interior of the pipe is passed through the wall of the latter.
The second method mentioned is distinguished by greater constructional simplicity but has the disadvantage that the gas stream bubbles out close to the inner wall of the pipe, which gives rise to considerable erosion of the refractory lining of the pipe.
According to this invention the gas is introduced through a replaceable cap provided on the mouth of the gas inlet pipe, the cap, which is made of porous refractory material, projecting inwardly from the wall of the pipe leading upwardly into the degasication vessel. Experience has shown that with the aid of a cap of this type it is possible tor the gas current to be dispersed over the cross-section of the pipe and therefore diverted from the refractory lining of the pipe to an extent sucient to keep erosion within tolerable limits.
On the other hand the cap itself is subject to considerable erosion and other wear, but since it is detachable, this circumstance is not of great importance, because the cap can be readily replaced whereas the replacement of the entire connecting pipe is troublesome and time consuming and constitutes a considerable interruption to operation of the plant.
In the preferred embodiment of the invention, an intermediate threaded spigot piece to which the cap is screwed, is disposed between a supply pipe leading to the outside and to the cap. Irrespective of the size (diameter) of the supply pipe this intermediate spigot can be of such dimensions that it provides support for the cap, which would be dilicult to achieve if the cap were to be connected direct to the supply pipe.
It is preferable that the spigot piece should also be replaceable, which can best be achieved by connecting to the supply pipe a threaded sleeve, which serves as a fastening for the other end of the spigot piece. If, as may occur, the cap cannot then be detached from the spigot piece, by detaching the latter from the supply pipe the replacement can readily be effected.
One embodiment of the invention is illustrated in the accompanying drawing, in which,
FIGURE l is a longitudinal section through the entire arrangement, and
FIGURE 2 is a corresponding section on an enlarged scale of the ringed area designated at I in FIGURE 1.
Referring to the drawings, there is seen in FIGURE 1 the lower part of the wall 1 of a degasication vessel for steel melts, to the bottom opening 2, in which there is connected by means of flanges 3 a pipe 4 open at the bottom. The pipe 4 is made up of a cylindrical steel casing 5, a refractory lining 6 and a refractory jacket 7. During degasication the pipe is immersed in a ladle containing the melt, the ladle being situated beneath the vessel.
In order to convey the gases which are to be introduced into the pipe 4 for the above mentioned reasons, there is provided a gas supply pipe 8 terminating in a cap indicated generally at 9. The supply pipe 8 is led from above through the refractory jacket 7, bent inwardly at 11, and connected to the cap 9 by means of an intermediate spigot piece 10 in the manner shown in detail in FIGURE 2.
The cap 9, which is made of porous refractory material, is provided with an internal screw thread 12, by means of which it is detachably secured to the end 13 of the intermediate spigot piece 10, the latter having a central locating ange 10 which is accommodated in a recess in the cap 9. The lining 6 is cut away to provide a recess and seating for the cap and ange 10 of the spigot piece which latter projects obliquely inwards and downwards from the lining 6. The spigot piece 10 in turn is provided at the opposite end with a screw thread 14, by which it is detachably screwed into a counterbore in a sleeve 15, which is joined fast to the supply pipe 8.
The incoming gas from the supply pipe 8 flows through the sleeve 15 into an axial bore 16 in the intermediate spigot piece 16, said bore having its outlet at the outer end face of the latter. The gas, under pressure, can thus penetrate into the pores of the cap 9 and passes out of the outer surface of the latter.
What is claimed is:
1. In a degasitcation plant comprising a vessel to receive the melt to be degasied, said vessel having an entry pipe for immersion in a ladle containing the melt, a device for introducing gas into the metal melt through the entry pipe of the degasitication vessel, said device comprising a gas pipe for supply of gas, said pipe extending through the wall of the entry pipe and having a terminal end on the inner side of the latter and a cap, which is made of refractory porous material, detachably secured to the terminal end of the pipe, said cap projecting inwardly from the wall of said entry pipe and through which the gas is dispersed therein.
2. In a degasication plant comprising a vessel to receive the melt to be degasiiied, said vessel having an entry pipe for immersion in a ladle containing the melt, which pipe includes an outer insulation layer,a device for introducing gas into the metal melt through the entry pipe of the degasication vessel, said device comprising a gas pipe for supply of gas, said pipe extending lengthwise of the insulation layer and having a terminal end on the inside of the pipe and a cap, which is made of refractory porous material, detachably secured to the terminal end of the pipe, said cap projecting inwardly from the wall of said entry pipe and through which lthe gas is dispersed therein.
3. In a degasification plant comprising a vessel to receive the melt to be degasitied, said vessel having an entry pipe for immersion in a ladle containing the melt, a device for introducing gas into the metal melt through the entry pipe of the degasification vessel, said device comprising a gas pipe for supply of gas, said gas pipe extending through the wall of the entry pipe and having a terminal end inside the wall of the latter a cap, which is made of refractory porous material, detachably connected to the terminal end of the pipe, the connection between the gas pipe and the cap being by means of an intermediate spigot piece, the spigot piece having a screw thread to receive the cap, said cap projecting inwardly from the wall of the pipe.
4. A device according to claim 3, in which the spigot piece is detachably secured at one end t0 the gas supply plpe.
4. 5. A device according to claim 3, in which a threaded sleeve is connected to the supply pipe, the spigot piece being detachably secured to the sleeve.
References Cited UNITED STATES PATENTS 2,562,096 7/1951 Herrman 239-432 2,809,107 10/1957 Russell 266--34 2,966,294 8/1961 John 266-34 3,056,595 l0/l962 Knuppel et al. 266-34 3,071,362 l/l963 Lorenz 266-34 3,154,404 10/1964 Lorenz 75-49 X 3,320,053 5/1967 Lehman 75-49 X 3,330,645 7/1967 Demoustier et al. 266-34 J. SPENCER OVERHOLSER, Primary Examiner.
E. MAR, Assistant Examiner.
US517219A 1965-01-09 1965-12-29 Devices for introducing gas into a metal melt Expired - Lifetime US3380727A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED0030466 1965-01-09

Publications (1)

Publication Number Publication Date
US3380727A true US3380727A (en) 1968-04-30

Family

ID=7040511

Family Applications (1)

Application Number Title Priority Date Filing Date
US517219A Expired - Lifetime US3380727A (en) 1965-01-09 1965-12-29 Devices for introducing gas into a metal melt

Country Status (2)

Country Link
US (1) US3380727A (en)
GB (1) GB1108498A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3521873A (en) * 1966-04-28 1970-07-28 Nippon Steel Corp Passing tube for vessel for vacuum-degassing molten steel
US3521874A (en) * 1967-05-12 1970-07-28 Reynolds Metals Co Gas diffuser unit for use in treating molten metal
US3565412A (en) * 1968-12-03 1971-02-23 Dresser Ind Device for stirring molten metal
FR2302156A1 (en) * 1975-02-25 1976-09-24 Voest Ag DEVICE FOR FLUSHING STEEL IN
US4576365A (en) * 1981-11-13 1986-03-18 Daussan Et Compagnie Device for the removal of inclusions contained in molten metals
US5295667A (en) * 1993-07-26 1994-03-22 Magneco/Metrel, Inc. Tundish baffle with fluted openings

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2562096A (en) * 1947-06-23 1951-07-24 Louis T Herrmann Nozzle
US2809107A (en) * 1953-12-22 1957-10-08 Aluminum Co Of America Method of degassing molten metals
US2966294A (en) * 1959-02-03 1960-12-27 Pelfrey Disposal bag
US3056595A (en) * 1958-09-19 1962-10-02 Hoerder Huettenunion Ag Refractory nipple for dipping into molten metal
US3071362A (en) * 1958-05-30 1963-01-01 Heraeus Gmbh W C Immersion pipe for degassing metals by a vacuum
US3154404A (en) * 1958-11-24 1964-10-27 Heraeus Gmbh W C Method for heating molten metals in a vacuum chamber
US3320053A (en) * 1964-09-25 1967-05-16 Bethlehem Steel Corp Method of injecting gases into steel melts
US3330645A (en) * 1962-08-07 1967-07-11 Air Liquide Method and article for the injection of fluids into hot molten metal

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2562096A (en) * 1947-06-23 1951-07-24 Louis T Herrmann Nozzle
US2809107A (en) * 1953-12-22 1957-10-08 Aluminum Co Of America Method of degassing molten metals
US3071362A (en) * 1958-05-30 1963-01-01 Heraeus Gmbh W C Immersion pipe for degassing metals by a vacuum
US3056595A (en) * 1958-09-19 1962-10-02 Hoerder Huettenunion Ag Refractory nipple for dipping into molten metal
US3154404A (en) * 1958-11-24 1964-10-27 Heraeus Gmbh W C Method for heating molten metals in a vacuum chamber
US2966294A (en) * 1959-02-03 1960-12-27 Pelfrey Disposal bag
US3330645A (en) * 1962-08-07 1967-07-11 Air Liquide Method and article for the injection of fluids into hot molten metal
US3320053A (en) * 1964-09-25 1967-05-16 Bethlehem Steel Corp Method of injecting gases into steel melts

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3521873A (en) * 1966-04-28 1970-07-28 Nippon Steel Corp Passing tube for vessel for vacuum-degassing molten steel
US3521874A (en) * 1967-05-12 1970-07-28 Reynolds Metals Co Gas diffuser unit for use in treating molten metal
US3565412A (en) * 1968-12-03 1971-02-23 Dresser Ind Device for stirring molten metal
FR2302156A1 (en) * 1975-02-25 1976-09-24 Voest Ag DEVICE FOR FLUSHING STEEL IN
US4576365A (en) * 1981-11-13 1986-03-18 Daussan Et Compagnie Device for the removal of inclusions contained in molten metals
US5295667A (en) * 1993-07-26 1994-03-22 Magneco/Metrel, Inc. Tundish baffle with fluted openings

Also Published As

Publication number Publication date
GB1108498A (en) 1968-04-03

Similar Documents

Publication Publication Date Title
US3715112A (en) Means for treating a liquid metal and particularly aluminum
US3397878A (en) Under-bath tuyere
US3773226A (en) Container with sliding shutter for a liquid melt
US4429816A (en) Union for providing inert gas between teeming nozzle and pouring tube
US3380727A (en) Devices for introducing gas into a metal melt
GB853853A (en) Continuous casting
SE451958B (en) DICE WITH GAS INLET
GB801519A (en) Improvements relating to sealing means for vacuum vessels
GB968866A (en) Method of continuously casting metal
US3131245A (en) Immersion pipe for vacuum degassing apparatus
US3214804A (en) Ladles
ES8302788A1 (en) Device for introducing gases into metallurgical vessels
US4091971A (en) Molten metal nozzle having capillary gas feed
US2692196A (en) Method and apparatus for treating molten metal
DE3063760D1 (en) Apparatus for introducing molten metal into a centrifugal casting installation for tubes and other cylindrical objects
GB1235091A (en) Process and apparatus for measuring in a continuous manner the oxygen in a molten metal
FR2451945A1 (en) Tuyere for injecting stirring gas into molten metal - where gas flows through narrow annular gap between refractory plug and conical ring, so rapid wear of tuyere is avoided
US4509977A (en) Process and device for scavenging a metal melt, in particular steel, in a casting ladle or the like provided with a plug closure
US3972517A (en) Tuyere for introducing reactants into a bath of molten metal
GB2094454A (en) Improvements in the pouring of molten metals
US3211545A (en) Process and apparatus for vacuum degassing of metal
ES445813A1 (en) Pouring of metals
GB1521194A (en) Apparatus for flushing steel with gas
DE69004742T2 (en) Device for holding and / or pouring out containers for molten metal baths.
GB1270982A (en) Improvements in or relating to a method and machine for centrifugally casting tubular metal bodies