US3479022A - Apparatus for vacuum treating liquid steel according to the circulation method - Google Patents

Apparatus for vacuum treating liquid steel according to the circulation method Download PDF

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Publication number
US3479022A
US3479022A US560651A US3479022DA US3479022A US 3479022 A US3479022 A US 3479022A US 560651 A US560651 A US 560651A US 3479022D A US3479022D A US 3479022DA US 3479022 A US3479022 A US 3479022A
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United States
Prior art keywords
vessel
degasifying
gas
vacuum
treating liquid
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Expired - Lifetime
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US560651A
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English (en)
Inventor
Werner Coupette
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STANDARD MESSO DUISBURG
Standard Messo Duisburg Gesellschaft fur Chemie-Technik Mbh & Co
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STANDARD MESSO DUISBURG
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    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]

Definitions

  • Heat energy of multi-atom inert gases is extremely high since the specific heat due to the increase in temperature is increased by dissociation and ionization energy; due to high temperatures at the phase borders, an intensive and quick reaction of the metal droplets is obtained. Heat losses occurring during the vacuum treatment are simultaneously obviated by radiation of the high temperatures, very favorable in a vacuum.
  • the present invention relates to an apparatus for vacuum treating liquid steel according to the circulating method, in which a degasifying vessel with two pipes extends into the steel melt.
  • Devices of this general type for carrying out the circulating degasifying method are known.
  • conveyor gas In order to induce the chemical reaction, it is known instead of conveyor gas to convey inert or reactive gases into the riser.
  • Plasma burners are operated by means of inert gas, such as argon, or a reactive gas, as for instance, hydrogen, oxygen, methane, carbon tetrachloride, chlorine, sodium vapor, or the like, or mixtures thereof.
  • inert gas such as argon
  • a reactive gas such as hydrogen, oxygen, methane, carbon tetrachloride, chlorine, sodium vapor, or the like, or mixtures thereof.
  • the heat losses occuring during the vacuum treatment are at the same time obviated according to the present invention, namely by the radiation of the high temperatures, which radiation is very favorable in a vacuum.
  • the degasifying vessel 1 is in a manner known per se with its two pipes 2 and 3 immersed into a ladle (not illustrated) which is filled with liquid steel.
  • a conduit 4 communicating with the riser 2 argon or any other suitable gas is blown into the vessel 1 whereby in a manner known per se a circulation will be obtained.
  • the steel is pulled upwardly and torn into droplets.
  • Vessel 1 communicates with the vacuum pump through a connection 5 and a hose (not illustrated) which is connected to connection 5.
  • the degasifying vessel 1 is equipped with controllable plasma burners 6 arranged in the upper portion of vessel 1.
  • Burners 6 are operated by an inert gas, or a reactive gas, so that the highly heated gas will be able to flow around the steel droplets. With a ton melt to be degasified, burners with a power of from 1000 to 2000 kilowatts will suflice.
  • high gas temperatures are selected so that a high heat supply with a relatively small quantity of gas with a temperature of approximately 25,000 C. will be obtained.
  • the supplied quantity of gas should not exceed 10% of the output of the vacuum pumps.
  • Plasma burners are generally Well known and have been described, for instance, in French Patent 1,311,252 which issued on Oct. 29, 1962.
  • the power output of such plasma burners may be controlled in any convenient manner, for instance, by alternating current or three-phase current. This is particularly favorable when a plurality of such burners are employed since" with superposition of three-phase current the power of the burners may be increased to a maximum in a very simple manner, which is practicallynot possible with methods not employing superposition of three-phase current.
  • a control circuit of this type is diagrammatically illustrated in the present drawing in which reference numerals 7 and 8 designate direct current generators respectively conductively connected to the electrodes 9, 10 and 11, 12 of the two burners 6 shown in the drawing. There is, furthermore, provided a source 13 of threephase current, the three-phase 14, 15, and 16 of which are respectively connected to electrodes 10 12 and a further electrode of a further burner (not shown).
  • An apparatus for vacuum treating liquid steel according to the circulation method for degasifying the steel comprising a degasifying vessel, pipe means connected to the lower portion of said vessel and communicating with the interior thereof, said pipe means being immersed in a steel melt, conduit means communicating with said pipe means through which gas is admitted for withdrawing steel from the steel meltand throwingtthe same in form of droplets into said degasifying vessel, adjustable plasma burner means arranged at the upper portion of said vessel and operable by inert or reactive gas to convey highly heated gases into the interior of said vessel and around steel droplets thrown up into the flow of said highly heated gases, and vacuum creating means connected to and communicating with said degasifying vessel.
  • An apparatus in which a plurality of plasma burner means are associated with said degasifying vessel and arranged to supply hot gas flow around the droplets for intensive metallurgical treatment.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
US560651A 1965-07-01 1966-06-27 Apparatus for vacuum treating liquid steel according to the circulation method Expired - Lifetime US3479022A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST024067 1965-07-01

Publications (1)

Publication Number Publication Date
US3479022A true US3479022A (en) 1969-11-18

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Application Number Title Priority Date Filing Date
US560651A Expired - Lifetime US3479022A (en) 1965-07-01 1966-06-27 Apparatus for vacuum treating liquid steel according to the circulation method

Country Status (4)

Country Link
US (1) US3479022A (cs)
JP (1) JPS4912B1 (cs)
DE (1) DE1458936A1 (cs)
GB (1) GB1129298A (cs)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3607228A (en) * 1969-01-13 1971-09-21 Armco Steel Corp Method of operating a vacuum degasser to equalize erosion of refractory leg liners
US3711615A (en) * 1969-09-30 1973-01-16 Advanced Technology Center Inc Plasma heating method
US3813469A (en) * 1973-04-09 1974-05-28 Daido Steel Co Ltd Method for heating vacuum degassing container
US3971875A (en) * 1974-01-04 1976-07-27 General Dynamics Corporation Apparatus and method for vacuum hot press joining, compacting and treating of materials
US4049248A (en) * 1971-07-16 1977-09-20 A/S Ardal Og Sunndal Verk Dynamic vacuum treatment
DE2933466A1 (de) * 1978-08-18 1980-03-06 Nippon Steel Corp Gefaess fuer die behandlung von geschmolzenem metall
US4718477A (en) * 1986-07-30 1988-01-12 Plasma Energy Corporation Apparatus and method for processing reactive metals
US4734551A (en) * 1986-01-10 1988-03-29 Plasma Energy Corporation Method and apparatus for heating molten steel utilizing a plasma arc torch
WO1989007499A1 (en) * 1988-02-09 1989-08-24 The Broken Hill Proprietary Company Limited Superheating and microalloying of molten metal by contact with a plasma arc
US4918282A (en) * 1986-01-10 1990-04-17 Plasma Energy Corporation Method and apparatus for heating molten steel utilizing a plasma arc torch
US5203910A (en) * 1991-11-27 1993-04-20 Premelt Pump, Inc. Molten metal conveying means and method of conveying molten metal from one place to another in a metal-melting furnace
RU2823106C2 (ru) * 2021-06-23 2024-07-18 ДжФЕ СТИЛ КОРПОРЕЙШН Способ рафинирования расплавленной стали

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022270225A1 (ja) * 2021-06-23 2022-12-29 Ｊｆｅスチール株式会社 溶鋼の精錬方法
EP4339303B1 (en) * 2021-06-23 2025-10-29 JFE Steel Corporation Molten steel refining method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3147330A (en) * 1962-09-24 1964-09-01 Union Carbide Corp Method for furnacing conductive materials
US3320053A (en) * 1964-09-25 1967-05-16 Bethlehem Steel Corp Method of injecting gases into steel melts
US3342250A (en) * 1963-11-08 1967-09-19 Suedwestfalen Ag Stahlwerke Method of and apparatus for vacuum melting and teeming steel and steellike alloys

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3147330A (en) * 1962-09-24 1964-09-01 Union Carbide Corp Method for furnacing conductive materials
US3342250A (en) * 1963-11-08 1967-09-19 Suedwestfalen Ag Stahlwerke Method of and apparatus for vacuum melting and teeming steel and steellike alloys
US3320053A (en) * 1964-09-25 1967-05-16 Bethlehem Steel Corp Method of injecting gases into steel melts

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3607228A (en) * 1969-01-13 1971-09-21 Armco Steel Corp Method of operating a vacuum degasser to equalize erosion of refractory leg liners
US3711615A (en) * 1969-09-30 1973-01-16 Advanced Technology Center Inc Plasma heating method
US4049248A (en) * 1971-07-16 1977-09-20 A/S Ardal Og Sunndal Verk Dynamic vacuum treatment
US3813469A (en) * 1973-04-09 1974-05-28 Daido Steel Co Ltd Method for heating vacuum degassing container
US3971875A (en) * 1974-01-04 1976-07-27 General Dynamics Corporation Apparatus and method for vacuum hot press joining, compacting and treating of materials
US4241904A (en) * 1978-08-18 1980-12-30 Nippon Steel Corporation Molten-metal treating vessel
DE2933466A1 (de) * 1978-08-18 1980-03-06 Nippon Steel Corp Gefaess fuer die behandlung von geschmolzenem metall
US4734551A (en) * 1986-01-10 1988-03-29 Plasma Energy Corporation Method and apparatus for heating molten steel utilizing a plasma arc torch
US4918282A (en) * 1986-01-10 1990-04-17 Plasma Energy Corporation Method and apparatus for heating molten steel utilizing a plasma arc torch
US4718477A (en) * 1986-07-30 1988-01-12 Plasma Energy Corporation Apparatus and method for processing reactive metals
WO1989007499A1 (en) * 1988-02-09 1989-08-24 The Broken Hill Proprietary Company Limited Superheating and microalloying of molten metal by contact with a plasma arc
US5203910A (en) * 1991-11-27 1993-04-20 Premelt Pump, Inc. Molten metal conveying means and method of conveying molten metal from one place to another in a metal-melting furnace
US5395094A (en) * 1991-11-27 1995-03-07 Premelt Pump, Inc. Means of conveying molten metal from one place to another in a metal-melting furnace with simultaneous alloying of the melt
US5403381A (en) * 1991-11-27 1995-04-04 Premelt Pump, Inc. Molten metal conveying means and method of conveying molten metal from one place to another in a metal-melting furnace with simultaneous degassing of the melt
RU2823106C2 (ru) * 2021-06-23 2024-07-18 ДжФЕ СТИЛ КОРПОРЕЙШН Способ рафинирования расплавленной стали

Also Published As

Publication number Publication date
GB1129298A (en) 1968-10-02
JPS4912B1 (cs) 1974-01-05
DE1458936A1 (cs) 1970-07-30

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