US3395910A - Metallurgical tuyere - Google Patents

Metallurgical tuyere Download PDF

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Publication number
US3395910A
US3395910A US510772A US51077265A US3395910A US 3395910 A US3395910 A US 3395910A US 510772 A US510772 A US 510772A US 51077265 A US51077265 A US 51077265A US 3395910 A US3395910 A US 3395910A
Authority
US
United States
Prior art keywords
tuyere
nozzle
molten metal
refractory
central conduit
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
US510772A
Other languages
English (en)
Inventor
Ronald L W Holmes
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.)
Union Carbide Corp
Original Assignee
Union Carbide Corp
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 Union Carbide Corp filed Critical Union Carbide Corp
Priority to US510772A priority Critical patent/US3395910A/en
Priority to BE690348D priority patent/BE690348A/xx
Priority to FR85470A priority patent/FR1503078A/fr
Priority to DE19661508282 priority patent/DE1508282B1/de
Priority to GB53603/66A priority patent/GB1133359A/en
Application granted granted Critical
Publication of US3395910A publication Critical patent/US3395910A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
    • 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
    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • 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
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material

Definitions

  • This invention relates to a metallurgical tuyere and more particularly to a submerged tuyere for injecting a gas below the surface of a molten metal bath.
  • the main object of the invention is to provide a tuyere which will exhibit a relatively long life when exposed to a high temperature bath of molten metal such as steel, even though such tuyere is not water cooled.
  • Another object is to provide a tuyere which will not readily become plugged with molten metal during its operation.
  • Still another object is to provide a tuyere which in addition to satisfying the foregoing -objects will also enable the gas to be discharged at about its critical velocity.
  • FIGURE 1 is a sectional view of the tuyere of the inventi-0n when in operative position below the surface of a molten metal bath in a degassing vessel, and
  • FIGURE 2 is an isometric view of a portion of the injection tuyere shown in FIGURE l.
  • the apparatus of the invention consists of a central conduit for conduct-ing a ow of gas, e.g. argon, from a source of gas supply, such conduit having an inlet end and a discharge end. Connected to the discharge end of this conduit is a nozzle of smaller diameter than the central conduit. The nozzle is sized so that the gas will be discharged at critical velocity at the flow rate of gas expected to be injected into the molten metal.
  • a ow of gas e.g. argon
  • a sheath of refractory surrounding the nozzle is utilized to protect the nozzle from actually coming into contact with the molten metal.
  • a highly conductive metal stopper member is disposed within the central conduit adjacent its inlet end. In the event there is a sudden failure in the gas supply pressure and molten metal enters the nozzle and central conduit, this stopper member will prevent the molten metal from flowing into the gas supply lines. Another advantage of this stopper member is that its removal enables one to insert a cleaning tool axially through the central conduit and nozzle in order to clean same if it becomes partially plugged.
  • this pipe' should be greater than the anticipated height of molten metal in the de- Vgassing vessel so that the gravity effect will be neutralized and molten metal will not be able toenter the gas supply system.
  • the tuyere 10 of the invention is shownpositioned at the bottom ofa degassing vessel 11 having a lining 12.
  • the tuyere consists of a centralA conduit 15 having an inlet end 16 and a discharge end 17.
  • the inlet end -16 is connected to an upwardly ex- Y tending length of heavy pipe 18.
  • the lengthA of pipe 18 is' preferably greater than the expected head of molten met'- al in the degassing vessel.
  • the upper end of pipe '18 is connected via conduit 19 to a gaseous supply means such as "a tank-of pressurized gas.
  • the discharge end"'17l of central conduit 15 has a tuyereV nozzle 20 connected thereto.
  • the diameter of tuyere nozzle 20 is sized so as to provide'critical flow at the flow rates anticipated which will be required for a particular degassing process.
  • the nozzle 20, along with the exposedportion o f central conduit 15, is encased with a sheath of low grade refractory cement 21 which in turn is su-rrounded by a sheath of high grade refractory brick 22.
  • the refractory brick 22 is secured to the side of the vessel lining by a refractory fillet 23.
  • the refractory cement 21 When the refractory cement 21 is applied it is molded so as to provide a discharge passage 24 extending axially from the discharge end of nozzle 20.
  • the diameter of this discharge passage is also preferably of the same diameter as the diameter of nozzle 20.
  • the overall sheath of refractory serves to prevent molten metal from coming into contact with the exposed surfaces of the tuyere, thereby prolonging the life of the tuyere, though it is not water cooled.
  • the refractory sheath is usually replaced after every heat.
  • the refractory sheath as well as the pressure of the gas discharged from the tuyere prevent molten metal from entering or otherwise contacting the metal surfaces of the tuyere.
  • the gas between the shut-off valve (not shown) and the tuyere nozzle 20 escapes into the molten metal until the pressure in the tuyere is equal to the ferrostatic pressure.
  • some of the metal freezes at the face of the nozzle 20'. In most cases, however, the metal freezes in the molded port 24, just short of the tuyere nozzle, and thus only the refractory sheath would be replaced between heats.
  • a high conductive stopper rod member 26 is positioned adjacent the inlet end of central conduit 15 so as to cause the molten metal to freeze at this point and prevent it from entering the gas supply lines.
  • the stopper rod member 26 may be formed of copper or other highly heat conductive material.
  • the stopper rod member 26 is also positioned axially of the central conduit 15 so that when the rod is removed it will enable one to insert a cleaning tool to remove a partially plugged up tuyere tube or nozzle.
  • a length of heavy pipe 18 is positioned vertically between the inlet end of conduit 15 and the tubing 19 leading to the gas supply, the length of such pipe being preferably slightly greater than the anticipated height of molten metal to be held within the degassing vessel.
  • a tuyere having a central conduit 15 of 1/2 inch inside diameter, with a tuyere nozzle 20 of 0,220 inch inside diameter was successfully operated at a flow rate of 4,000 s.c.f.h. of argon.
  • the low grade refractory cement 21 consisted essentially of about 30% alumina and 70% 3 silica.
  • the high grade refractory 22 consisted essentially of an 80% alumina ramming refractory, balance silica.
  • the tuyere was positioned about three feet beneath the surface of a molten steel bath in a degassing vessel having a capacity of about 90 cubic feet.
  • a metallurgical tuyere for submerged injection of inert gas into a molten metal bath which comprises: a central conduit having an inlet end and a discharge end, a metal nozzle connected to said discharge end of said central conduit, said nozzle having a diameter which is smaller than the diameter of said central conduit, and a protective sheath of refractory material surrounding said nozzle and the immersed portion of said central conduit, said sheath of refractory material additionally forming a discharge passage extending axially from the discharge end of said nozzle for passing gas from said nozzle into said bath, whereby said sheath of refractory material prevents molten metal from coming into contact with said nozzle.
  • a metallurgical tuyere asclaimed in claim 1 ncluding a highly heat conductive metal stopper member positioned adjacent the inlet end of said central conduit and extending thereinto.
  • a metallurgical tuyere as claimed in claim 1 including an upwardly extending length of pipe connected to the inlet end of said central conduit, the length of said pipe being slightly greater than the anticipated head of molten metal to be treated by said tuyere in a givenheat.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
US510772A 1965-12-01 1965-12-01 Metallurgical tuyere Expired - Lifetime US3395910A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US510772A US3395910A (en) 1965-12-01 1965-12-01 Metallurgical tuyere
BE690348D BE690348A (nl) 1965-12-01 1966-11-28
FR85470A FR1503078A (fr) 1965-12-01 1966-11-29 Lance métallurgique
DE19661508282 DE1508282B1 (de) 1965-12-01 1966-11-30 Metallurgische Duese
GB53603/66A GB1133359A (en) 1965-12-01 1966-11-30 Tuyeres

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US510772A US3395910A (en) 1965-12-01 1965-12-01 Metallurgical tuyere

Publications (1)

Publication Number Publication Date
US3395910A true US3395910A (en) 1968-08-06

Family

ID=24032134

Family Applications (1)

Application Number Title Priority Date Filing Date
US510772A Expired - Lifetime US3395910A (en) 1965-12-01 1965-12-01 Metallurgical tuyere

Country Status (5)

Country Link
US (1) US3395910A (nl)
BE (1) BE690348A (nl)
DE (1) DE1508282B1 (nl)
FR (1) FR1503078A (nl)
GB (1) GB1133359A (nl)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3608881A (en) * 1967-03-24 1971-09-28 Za Zvetni Metali K Tuyere apparatus for using liquid fuel in the fuming process
US4572482A (en) * 1984-11-19 1986-02-25 Corcliff Corporation Fluid-cooled metallurgical tuyere
EP0181853A1 (de) * 1984-09-18 1986-05-21 Radex Austria Aktiengesellschaft für feuerfeste Erzeugnisse Gasspülstein für metallurgische Öfen und Gefässe
US4721287A (en) * 1985-02-20 1988-01-26 Didier-Werke Ag Sleeve for blowing solid materials into a molten metal bath and method for use thereof
WO2016131090A1 (en) * 2015-02-17 2016-08-25 Technological Resources Pty. Limited Solids injection lance and conveying system maintenance without slag drain

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1141174A (en) * 1979-10-31 1983-02-15 Guy Savard Homogenization of metal using gas
DE3003884C2 (de) * 1980-02-02 1983-02-10 Didier-Werke Ag, 6200 Wiesbaden Verfahren zum Einbau und Austausch eines gasdurchlässigen feuerfesten Einsatzes in der Wandung eine Schmelze enthaltenden Behälters für das Einführen von Gasen, in den Behälter und Anordnung für die Durchführung dieses Verfahrens

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2294162A (en) * 1942-08-25 Blast furnace cinder notch stopper
US3236629A (en) * 1962-12-19 1966-02-22 United States Steel Corp Method of introducing fluid fuel into a blast furnace
US3264874A (en) * 1962-05-30 1966-08-09 Max Planck Inst Eisenforschung Apparatus for measuring temperatures of iron and steel melts

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU31885A1 (nl) * 1951-12-24

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2294162A (en) * 1942-08-25 Blast furnace cinder notch stopper
US3264874A (en) * 1962-05-30 1966-08-09 Max Planck Inst Eisenforschung Apparatus for measuring temperatures of iron and steel melts
US3236629A (en) * 1962-12-19 1966-02-22 United States Steel Corp Method of introducing fluid fuel into a blast furnace

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3608881A (en) * 1967-03-24 1971-09-28 Za Zvetni Metali K Tuyere apparatus for using liquid fuel in the fuming process
EP0181853A1 (de) * 1984-09-18 1986-05-21 Radex Austria Aktiengesellschaft für feuerfeste Erzeugnisse Gasspülstein für metallurgische Öfen und Gefässe
US4572482A (en) * 1984-11-19 1986-02-25 Corcliff Corporation Fluid-cooled metallurgical tuyere
US4721287A (en) * 1985-02-20 1988-01-26 Didier-Werke Ag Sleeve for blowing solid materials into a molten metal bath and method for use thereof
WO2016131090A1 (en) * 2015-02-17 2016-08-25 Technological Resources Pty. Limited Solids injection lance and conveying system maintenance without slag drain
CN107429305A (zh) * 2015-02-17 2017-12-01 技术资源有限公司 无熔渣排出的固体注入喷枪和输送系统维护

Also Published As

Publication number Publication date
BE690348A (nl) 1967-05-29
DE1508282B1 (de) 1970-08-27
FR1503078A (fr) 1967-11-24
GB1133359A (en) 1968-11-13

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