EP0166646A1 - Vorrichtung zur Herstellung von Stahl durch Vorfrischen von Roheisen - Google Patents

Vorrichtung zur Herstellung von Stahl durch Vorfrischen von Roheisen Download PDF

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Publication number
EP0166646A1
EP0166646A1 EP85401122A EP85401122A EP0166646A1 EP 0166646 A1 EP0166646 A1 EP 0166646A1 EP 85401122 A EP85401122 A EP 85401122A EP 85401122 A EP85401122 A EP 85401122A EP 0166646 A1 EP0166646 A1 EP 0166646A1
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EP
European Patent Office
Prior art keywords
reactor
dephosphorization
level
stage
decanter
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.)
Granted
Application number
EP85401122A
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English (en)
French (fr)
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EP0166646B1 (de
Inventor
Aristide Berthet
Guy Denier
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Institut de Recherches de la Siderurgie Francaise IRSID
Original Assignee
Institut de Recherches de la Siderurgie Francaise IRSID
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Publication date
Application filed by Institut de Recherches de la Siderurgie Francaise IRSID filed Critical Institut de Recherches de la Siderurgie Francaise IRSID
Priority to AT85401122T priority Critical patent/ATE36007T1/de
Publication of EP0166646A1 publication Critical patent/EP0166646A1/de
Application granted granted Critical
Publication of EP0166646B1 publication Critical patent/EP0166646B1/de
Expired legal-status Critical Current

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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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/56—Manufacture of steel by other methods
    • C21C5/567—Manufacture of steel by other methods operating in a continuous way
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/04—Removing impurities other than carbon, phosphorus or sulfur

Definitions

  • the present invention relates to the production of steel by pre-refining cast iron.
  • the oxygen refining converter is a reactor which, in principle, makes it possible to remove oxidizable elements from cast iron to very low contents, the main ones being carbon, phosphorus and silicon .
  • the main ones being carbon, phosphorus and silicon .
  • oxygen blowing from the bottom, or mixed blowing from the bottom and from the top it still seems difficult to obtain well reproducible results from one refining installation to another. .
  • the desiliconization and dephosphorization operations carried out under these conditions characterize what is now called, the pre-treatment, or more precisely the pre-refining of the cast iron.
  • the known pre-refining installations all proceed by sequential operations (desiliconization, then dephosphorization, then decarburization) on discrete and repetitive quantities of pig iron (see example GB-A-2,072,221).
  • Part of the mass of liquid pig iron to be pretreated is in fact transferred successively into several independent metallurgical vessels, more or less specialized each for the treatment phase assigned to it, or else placed in a single vessel, generally a straight pocket, which it is brought to fixed stations of successive treatments distributed in the workshop. (French patent application No. 2,439,821 to NSC).
  • the installation according to the invention is designed to operate continuously and can therefore have a significantly higher efficiency than current installations. Furthermore, since the pig iron can circulate freely from the desiliconization and dephosphorization stage to the decarburization stage, the transfer devices used up to now can be purely and simply eliminated, which consequently allows an appreciable reduction in investments. .
  • the desiliconization and dephosphorization stage comprises a closed desiliconization unit and a closed dephosphorization unit each comprising a reactor separated from a decanter by a partition having a communication opening below the predetermined level and the upper end of which is situated above this level and forms a slag overflow threshold,
  • the desiliconization reactor comprising means for introducing the pre-refining pig iron, means for introducing the desiliconization agents, and means for stirring the metal bath;
  • the dephosphorization reactor comprising means for introducing the dephosphorizing agents, means for creating an oxidizing atmosphere, and means for stirring the metal bath;
  • desiliconization and dephosphorization decanters comprising means for continuously evacuating the slag which they contain; the desiliconization decanter being connected to the dephosphorization reactor by a natural iron transfer duct while the dephosphorization decanter is connected to a submerged connecting duct communicating with the decarburization stage.
  • the installation represented in FIGS. 1 to 3 comprises a stage of desiliconization and dephosphorization constituted by a closed enclosure A in which the cast iron to be pre-refined is intended to form a molten bath AR reaching a level predetermined N 1 substantially constant, a decarburization stage also formed by a closed enclosure B communicating with the outlet of stage A, and a metallurgical vessel C provided where appropriate for nuancing the steel leaving stage B .
  • the desiliconization and dephosphorization stage A comprises a first reactor 1 and a first contiguous decanter 2 separated from each other by a first partition 3 comprising a communication opening 4 below the level N and the end of which upper is above it.
  • the first reactor comprises a chute 5 for introducing the liquid cast iron to be pre-refined, a line 6 for introducing agents for desiliconization and dephosphorization in the divided solid state, a door 7 for introducing possibly cooling additions such as scrap, pre-reduced or ore, etc ..., and a lance 8 blowing gaseous oxygen preferably technically pure to create an oxidizing atmosphere above the iron bath.
  • a chute 5 for introducing the liquid cast iron to be pre-refined
  • a line 6 for introducing agents for desiliconization and dephosphorization in the divided solid state
  • a door 7 for introducing possibly cooling additions such as scrap, pre-reduced or ore, etc ...
  • a lance 8 blowing gaseous oxygen preferably technically pure to create an oxidizing atmosphere above the iron bath.
  • the desiliconing agents are generally natural metal oxides such as iron or manganese ore, and the dephosphorizing agents, basic compounds such as sodium carbonate, lime or calcium carbonate, which can, if necessary, be in the form of agglomerates specially prepared and whose basicity is adjusted to the desired value.
  • the first reactor 1 also comprises means 9 for stirring the metal bath, these means being able for example to be constituted by injectors of stirring fluid such that permeable refractory elements, connected to a supply (not shown) of pressurized gas, such as nitrogen or argon for example.
  • the permeable refractory elements can advantageously be of the type described in European patent No. 0 021 861.
  • the first decanter 2 comprises an outlet opening 10 located below the level N and connected to a connecting conduit 11, such as a siphon intended for naturally and continuously transferring the desiliciated and dephosphorized iron AD from the decanter to the decarburization stage B. It also comprises, above the level N 1 , and preferably in a position remote from the reactor, a scrub weir 12 for continuously discharging the slag for de-silicification and dephosphorization supplied in the reactor 1 then passed into the calm enclosure of the decanter by overflowing above the threshold which constitutes the free upper end of the separating partition 3. A chimney 13 for extracting the fumes is also provided at the end of the decanter remote from the reactor.
  • the decarburization stage B comprises a second reactor 14 in which the bath of decarburization of the cast iron BR is intended to form a molten bath reaching a predetermined level N 2 , and a second decanter 15 separate from the second reactor 14 by a watertight partition 16, the upper end of which is above the level N 2 .
  • the second reactor 14 comprises, in its part located below the level N 2 , an inlet opening 17 communicating with the siphon 11, and means 18 for pneumatic stirring of the bath, which may be of the type provided in the bottom of the first reactor 1. It further comprises means 19 for blowing an oxidizing gas above the iron bath which it contains, these means being for example an oxygen lance, as well as a door 21 for possibly introducing cooling materials, such as as scrap.
  • the levels N and N are at the same height since the reactor 1, the decanter 2 and the reactor 14 communicate with each other according to the principle eg communicating vessels. It goes without saying, however, that the level N 2 could be at a height lower than that of the level N 1 , for example if the siphon 11 was replaced by a pipe with adjustable flow rate.
  • the second settling tank 15 As for the second settling tank 15, it comprises a weir 20 for discharging the decarburization slag, a chimney 22 for extracting the fumes, and an outlet orifice 23 intended for discharging the refined cast iron towards the shade C.
  • the silicon and phosphorus of the cast iron contained in the first reactor 1 oxidize on contact with the oxygen supplied by the ore, and the oxides produced are fixed in the slag formed by the agents of desiliconization and dephosphorization and of which the major part floating on the free surface of the molten bath.
  • This slag being produced continuously, it constantly overflows above the partition 3 and arrives in the first decanter 2 to go towards the weir 12 which ensures its continuous evacuation.
  • Cast iron largely siliceous and dephosphoric in the first reactor 1, goes continuously through the communication opening 4 of the partition 3 and thus reaches the first decanter 2 in which the desiliconization and the dephosphorization calmly end, at the same time as the separation of the metal and slag which were fairly mixed in the reactor under the combined influence of oxidation reactions and pneumatic mixing of the bath.
  • the siliceous and dephosphorized cast iron then flows out of the decanter 2 through the passage 10 and passes through the siphon 11 to reach the second reactor 14.
  • the metal-slag emulsion is divided slowly by gravity into two superposed phases: the refined metal which flows continuously through the outlet orifice 23 and the slag supernatant on the bath of metal and which is continuously discharged through the weir 20.
  • Figures 4 and 5 show an installation in which the desiliconization and dephosphorization stage A is divided into two adjacent and contiguous units: a desiliconization unit D and a dephosphorization unit E downstream of the desiliconization unit.
  • the desiliconization unit D comprises a reactor 24 separated from a decanter 25 by a partition 26 comprising a communication opening 27 below the level N defined by the free surface of the cast iron to be refined and whose upper end is at above this level.
  • the dephosphorization unit E comprises a reactor 28 separated from a decanter 29 by a partition 30 having an opening 31 below the level N and the end of which upper is above this level.
  • the desiliconization reactor 24 comprises, in its part located above the level N 3 , means 32 for introducing the pre-refined cast iron, means 33 for introducing silicon oxidation materials (such as iron ore) and the agents for forming a desilicon slag and means 34 for introducing coolants if necessary, and in its part located below level N 3 , stirring means 35 such as those provided in reactors 1 and 14 of the installation shown in Figures 1 to 3.
  • the desiliconization decanter 25 has a weir 36 provided above the level N to eliminate the slag of desiliconization, and an opening 37 located below the level N and communicating with the dephosphorization reactor 28.
  • the dephosphorization reactor 28 in its part located above the level N 3 , means 38 for introducing the dephosphorization agents and means 39 for creating an oxidizing atmosphere, a door 34 'for the introduction optional cooling materials, such as scrap metal, and in its part located below level N 3 , stirring means 40 of the metal bath.
  • the dephosphorization decanter 29 in turn comprises a weir 41 provided above the level N to remove the dephosphorization slag, and an opening 42 provided below the level N and communicating with a conduit 43 leading to the reactor 14 of the decarburization stage B.
  • FIGS. 4 and 5 therefore differs from the previous one by its stage A in which the desiliconization and the dephosphorization are carried out one after the other in separate reactive chambers instead of being carried out at the same time in the same container.
  • the cast iron poured into the installations in accordance with the invention may be raw blast furnace cast iron or cast iron with a substantially constant silicon content coming from a mixer.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Steroid Compounds (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Fertilizers (AREA)
EP85401122A 1984-06-22 1985-06-07 Vorrichtung zur Herstellung von Stahl durch Vorfrischen von Roheisen Expired EP0166646B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85401122T ATE36007T1 (de) 1984-06-22 1985-06-07 Vorrichtung zur herstellung von stahl durch vorfrischen von roheisen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8409819 1984-06-22
FR8409819A FR2566427B1 (fr) 1984-06-22 1984-06-22 Installation pour l'elaboration de l'acier par preaffinage de la fonte

Publications (2)

Publication Number Publication Date
EP0166646A1 true EP0166646A1 (de) 1986-01-02
EP0166646B1 EP0166646B1 (de) 1988-07-27

Family

ID=9305314

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401122A Expired EP0166646B1 (de) 1984-06-22 1985-06-07 Vorrichtung zur Herstellung von Stahl durch Vorfrischen von Roheisen

Country Status (7)

Country Link
US (1) US4627601A (de)
EP (1) EP0166646B1 (de)
JP (1) JPS6176607A (de)
AT (1) ATE36007T1 (de)
BR (1) BR8502988A (de)
DE (1) DE3563982D1 (de)
FR (1) FR2566427B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021176024A1 (fr) * 2020-03-05 2021-09-10 Saint-Gobain Centre De Recherches Et D'etudes Europeen Laitier de déphosphoration

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1201815B (it) * 1986-09-25 1989-02-02 Danieli Off Mecc Impianto di trasformazione di una carica metallica in semiprodotti e procedimento di fusione e colaggio connesso
US5301620A (en) * 1993-04-01 1994-04-12 Molten Metal Technology, Inc. Reactor and method for disassociating waste
US5555822A (en) * 1994-09-06 1996-09-17 Molten Metal Technology, Inc. Apparatus for dissociating bulk waste in a molten metal bath
US5733358A (en) * 1994-12-20 1998-03-31 Usx Corporation And Praxair Technology, Inc. Process and apparatus for the manufacture of steel from iron carbide
KR102546043B1 (ko) * 2022-12-07 2023-06-22 주식회사 부력에너지 컨버터 교체가 용이한 라인 조명 구조

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1430784A (fr) * 1964-05-04 1966-03-04 Centre Nat Rech Metall Procédé et dispositif pour l'affinage de la fonte, ainsi que aciers, métaux et scories obtenus par ledit procédé ou procédé similaire
DE1433465A1 (de) * 1962-04-16 1968-11-14 Cie Des Ateliers Et Forges De Verfahren und Vorrichtung zur Herstellung von Stahl
FR2202942A1 (de) * 1972-10-11 1974-05-10 Nat Res Inst Metals
FR2439821A1 (fr) * 1978-10-24 1980-05-23 Nippon Steel Corp Procede pour la fabrication d'acier
GB2072221A (en) * 1980-03-21 1981-09-30 Nippon Steel Corp Steelmaking process with separate refining steps
EP0061749B1 (de) * 1981-03-30 1986-02-26 Nippon Steel Corporation Feinungsperiode bei einem mehrstufigen Stahlerzeugungsverfahren

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809379A (en) * 1970-04-21 1974-05-07 Alsacienne Atom Installation for the treatment and movement of liquid metals
US4140521A (en) * 1973-01-22 1979-02-20 Galnbek Arnold A Method of continuously converting metallurgical melts
US4084959A (en) * 1976-12-15 1978-04-18 Nippon Steel Corporation Method for continuous refining of a molten iron base metal
US4457777A (en) * 1981-09-07 1984-07-03 British Steel Corporation Steelmaking
JPS5913008A (ja) * 1982-07-13 1984-01-23 Nippon Steel Corp 低シリコン溶銑の極低燐化方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1433465A1 (de) * 1962-04-16 1968-11-14 Cie Des Ateliers Et Forges De Verfahren und Vorrichtung zur Herstellung von Stahl
FR1430784A (fr) * 1964-05-04 1966-03-04 Centre Nat Rech Metall Procédé et dispositif pour l'affinage de la fonte, ainsi que aciers, métaux et scories obtenus par ledit procédé ou procédé similaire
FR2202942A1 (de) * 1972-10-11 1974-05-10 Nat Res Inst Metals
FR2439821A1 (fr) * 1978-10-24 1980-05-23 Nippon Steel Corp Procede pour la fabrication d'acier
GB2072221A (en) * 1980-03-21 1981-09-30 Nippon Steel Corp Steelmaking process with separate refining steps
EP0061749B1 (de) * 1981-03-30 1986-02-26 Nippon Steel Corporation Feinungsperiode bei einem mehrstufigen Stahlerzeugungsverfahren

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 8, no. 98 (C-221) [1535], 9 mai 1984, page 51 C 221; & JP - A - 59 13 008 (SHIN NIPPON SEITETSU K.K.) 23-01-1984 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021176024A1 (fr) * 2020-03-05 2021-09-10 Saint-Gobain Centre De Recherches Et D'etudes Europeen Laitier de déphosphoration
CN115335347A (zh) * 2020-03-05 2022-11-11 法商圣高拜欧洲实验及研究中心 脱磷炉渣

Also Published As

Publication number Publication date
DE3563982D1 (en) 1988-09-01
BR8502988A (pt) 1986-03-04
FR2566427A1 (fr) 1985-12-27
US4627601A (en) 1986-12-09
JPS6176607A (ja) 1986-04-19
FR2566427B1 (fr) 1989-10-13
ATE36007T1 (de) 1988-08-15
EP0166646B1 (de) 1988-07-27

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