US3843354A - Pneumatic refining of pig iron - Google Patents

Pneumatic refining of pig iron Download PDF

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Publication number
US3843354A
US3843354A US00225279A US22527972A US3843354A US 3843354 A US3843354 A US 3843354A US 00225279 A US00225279 A US 00225279A US 22527972 A US22527972 A US 22527972A US 3843354 A US3843354 A US 3843354A
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US
United States
Prior art keywords
converter
blowing
oxygen
fluid
outer tube
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
US00225279A
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English (en)
Inventor
P Nilles
L Philippe
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.)
Centre de Recherches Metallurgiques CRM ASBL
Original Assignee
Metallurg Ct Voor Res In De Me
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 Metallurg Ct Voor Res In De Me filed Critical Metallurg Ct Voor Res In De Me
Application granted granted Critical
Publication of US3843354A publication Critical patent/US3843354A/en
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Expired - Lifetime legal-status Critical Current

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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
    • 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
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/34—Blowing through the bath

Definitions

  • the present invention relates to improvements in a process for the pneumatic refining of pig iron in which the refining gas constituted totally or to a large extent by commercially pure oxygen is blown into the refining bath through one or more tuyeres housed in the lower part (preferably in the bottom) of the converter.
  • the object of the present invention is to provide a refining process in which desulphurizing of the bath takes place in the actual converter.
  • This pig iron refining process in which use is made of a converter comprising at least one tuyere with two coaxial tubes housed in the converter bottom or in the lower part of the converter wall, includes two phases; during the first phase of the refining operation a fluid with a reducing character, such as a hydrocarbon, is blown into the molten metal via the peripheral conduit of the tuyere, and simultaneously a preferably non-oxidizing carrier gas which has lime in suspension (preferably in the form of a powder) is blown in via the central conduit of the tuyere; after removal of at least part of the slag formed in the course of the first phase there follows a second phase of blowing into the bath via the central conduit of the tuyere of a gas whose major component is oxygen, the oxygen preferably being commercially pure, while a protective fluid is blown in via the peripheral conduit, preferably of the same nature as the fluid with a reducing character injected via this same peripheral conduit in the course of the first phase.
  • the carrier gas which has lime in suspension and is blown in via the central conduit in the course of the first phase of the operation can be an inert gas (i.e. a gas which is inert to the contents of the converter) such as nitrogen or aron; if necessary, however, the carrier gas can be of the same nature (i.e. composition) as the fluid with a reducing character blown in via the peripheral conduit.
  • a preferential embodiment of the invention consists in the use of natural gas (a hydrocarbon gas obtained from the earths crust).
  • the use as a gas for supporting the lime of a gaseous mixture comprising notably any two of the gases referred to above does not represent a departure from the scope of the invention.
  • a mass of 17.6 tonnes of molten pig iron containing 0.068% sulphur was introduced into a converter having a perforated base fitted with tuyeres with two coaxial tubes whose internal and external diameters were respectively 12 and 15 mm., and 17 and 22 mm.
  • a second phase comprising blowing a fluid consisting of an oxygen-containing gas whose major component is oxygen through the inner tube, and simultaneously blowing a protective fluid through the outer tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
US00225279A 1971-02-11 1972-02-10 Pneumatic refining of pig iron Expired - Lifetime US3843354A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE762837A BE762837A (fr) 1971-02-11 1971-02-11 Perfectionnements aux procedes d'affinage pneumatique de la fonte.

Publications (1)

Publication Number Publication Date
US3843354A true US3843354A (en) 1974-10-22

Family

ID=3857716

Family Applications (1)

Application Number Title Priority Date Filing Date
US00225279A Expired - Lifetime US3843354A (en) 1971-02-11 1972-02-10 Pneumatic refining of pig iron

Country Status (6)

Country Link
US (1) US3843354A (de)
JP (1) JPS587689B1 (de)
BE (1) BE762837A (de)
DE (1) DE2204789B2 (de)
FR (1) FR2125310B1 (de)
LU (1) LU64767A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3972708A (en) * 1973-09-13 1976-08-03 Verfahrenstechnik Dr.-Ing. Kurt Baum Process for avoiding formation of smoke and flames in bottom blown converters
US4047937A (en) * 1972-12-04 1977-09-13 United States Steel Corporation Method for controlling the operation of a steel refining converter
US4295882A (en) * 1978-10-24 1981-10-20 Nippon Steel Corporation Steel making process
US4388112A (en) * 1980-03-21 1983-06-14 Nippon Steel Corporation Steelmaking process with separate refining steps
US6379425B1 (en) * 1999-06-07 2002-04-30 Kawasaki Steel Coporation Method of desulfurizing molten iron
WO2009003364A1 (fr) * 2007-07-03 2009-01-08 Northeastern University Procédé de fabrication d'acier dans un convertisseur à lances supérieure, inférieures et latérale

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE773855A (fr) * 1971-10-12 1972-01-31 Centre Rech Metallurgique Procede pour la desulfuration d'un metal.
DE2822791C2 (de) * 1977-05-26 1983-12-08 Gruzinskij politechničeskij institut imeni V.I. Lenina, Tbilisi Vorrichtung zum Einführen pulverförmiger Reagenzien mittels eines Trägergasstromes in eine Metallschmelze

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1166389A (fr) * 1956-02-23 1958-11-05 Procédé de désulfuration de la fonte et de l'acier et produits conformes à ceux obtenus par ledit procédé

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4047937A (en) * 1972-12-04 1977-09-13 United States Steel Corporation Method for controlling the operation of a steel refining converter
US3972708A (en) * 1973-09-13 1976-08-03 Verfahrenstechnik Dr.-Ing. Kurt Baum Process for avoiding formation of smoke and flames in bottom blown converters
US4295882A (en) * 1978-10-24 1981-10-20 Nippon Steel Corporation Steel making process
US4388112A (en) * 1980-03-21 1983-06-14 Nippon Steel Corporation Steelmaking process with separate refining steps
US4457778A (en) * 1980-03-21 1984-07-03 Nippon Steel Corporation Steelmaking process with separate refining steps
US6379425B1 (en) * 1999-06-07 2002-04-30 Kawasaki Steel Coporation Method of desulfurizing molten iron
WO2009003364A1 (fr) * 2007-07-03 2009-01-08 Northeastern University Procédé de fabrication d'acier dans un convertisseur à lances supérieure, inférieures et latérale

Also Published As

Publication number Publication date
JPS587689B1 (de) 1983-02-10
DE2204789B2 (de) 1973-10-25
FR2125310B1 (de) 1976-07-23
BE762837A (fr) 1971-08-11
FR2125310A1 (de) 1972-09-29
LU64767A1 (de) 1972-07-04
DE2204789A1 (de) 1972-09-28

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