US3856510A - Pig iron refining process - Google Patents

Pig iron refining process Download PDF

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Publication number
US3856510A
US3856510A US00347521A US34752173A US3856510A US 3856510 A US3856510 A US 3856510A US 00347521 A US00347521 A US 00347521A US 34752173 A US34752173 A US 34752173A US 3856510 A US3856510 A US 3856510A
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US
United States
Prior art keywords
blowing
converter
tuyere
oxidizing gas
protective fluid
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
US00347521A
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English (en)
Inventor
P Nilles
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.)
Eisenwerke Gesellschaf Maximilianshuette mbH
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Eisenwerke Gesellschaf Maximilianshuette mbH
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Publication date
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Publication of US3856510A publication Critical patent/US3856510A/en
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Expired - Lifetime 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
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/32—Blowing from above
    • 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 a pig iron refining process and more specifically to refining phosphorus containing pig iron in a tiltable refining vessel.
  • the blowing of oxygen into the molten pig iron in the converter through one or more side tuyeres located in the lateral wall of the converter and below the normal upper level of the liquid metal has been proposed instead of being located in the converter bottom.
  • the refining gas is blown through one or more tuyeres in the converter side wall and the jet of refining gas is surrounded by a fluid protecting the converter lining against the corrosive action of the oxygen jet at the region where it discharges into the melt.
  • the object of the present invention is a pig iron refining process and specifically for refining phosphorus pig iron, which is carried out with a tipping converter equipped with at least one side tuyere having dual, coaxial conduits.
  • the process of the present invention comprises a first stage consisting of: (l charging the converter with liquid iron, with scrap iron and advantageously with lime in powder or blocks; and (2) blowing a highly oxidizing gas which may contain powdered slag forming agents through the central conduit of the side tuyere(s), and in blowing simultaneously a protective fluid through the peripheral tube of the tuyere(s), both fluids discharging below the upper level of the liquid metal surface, during a first stage in which the converter is substantially vertical. This procedure is continued until a carbon content close to the desired final one is achieved.
  • blowing is performed through the central conduit of the side tuyere(s) in the side wall and onto the metal bath with a highly oxidizing gas jet capable of penetrating the slag and the metal through the slag while simultaneously blowing a protective fluid through the pe ripheral conduit of the said tuyere(s).
  • FIGS. 1 and 2 are schematic representations of the first and second stages of the process described above showing the convertor in a vertical position and in a horizontal position, respectively. It will be understood that the tipping convertor can be further tilted for dis charging the contents of the convertor after refining is completed.
  • EXAMPLE I A pig iron containing 3.6% C, 0.3% Si, 0.3% Mn and 1.8% P, balance Fe except for incidental impurities was charged into a 35 ton convertor. The melt was at about l,240C. The charge consisted of 29 tons of the stated pig iron, 10 tons of scrap, 2.7 tons of powdered lime and 200 Kg. of colemanite as a flux.
  • the oxygen blow is as follows: a. In a first phase with the convertor vertical, 1,30 Nm were blown in through a side tuyere at the rate of Nm lmirr, for 13 minutes. The oxygen was introduced through a high chromium steel pipe. The oxygen stream was shielded by 3.6 Nm of propane blown in as a jacket around the oxygen, through a larger pipe concentric with the oxygen pipe, at a flow rate of about 3.6
  • the final metal analyzed 0.575%C and 0.026%P, and had a temperature of about 1,62.0C. Approximately 24% of the iron was oxidized and recovered as slag.
  • the resulting product contained 0.6% C and 0.012% P and had a temperature of about. 1,610C. About 9% iron was oxidized in the slag.

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  • 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)
US00347521A 1972-04-14 1973-04-03 Pig iron refining process Expired - Lifetime US3856510A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE782186A BE782186A (fr) 1972-04-14 1972-04-14 Procede d'affinage de fonte.

Publications (1)

Publication Number Publication Date
US3856510A true US3856510A (en) 1974-12-24

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ID=3859555

Family Applications (1)

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US00347521A Expired - Lifetime US3856510A (en) 1972-04-14 1973-04-03 Pig iron refining process

Country Status (4)

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US (1) US3856510A (xx)
BE (1) BE782186A (xx)
FR (1) FR2180132B3 (xx)
LU (1) LU67353A1 (xx)

Cited By (3)

* 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
US4002467A (en) * 1974-01-30 1977-01-11 Verfahrenstechnik Dr.-Ing. Kurt Baum Method for recovering reaction gases from steel converters which are bottom blown with oxygen and cooled with hydrocarbons
WO2019158479A1 (en) * 2018-02-16 2019-08-22 Sms Group Gmbh Method for refining molten metal using a converter

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2855293A (en) * 1955-03-21 1958-10-07 Air Liquide Method and apparatus for treating molten metal with oxygen
US2875037A (en) * 1953-03-17 1959-02-24 Pennsylvania Engineering Corp Method of making bessemer or converter steel
FR1450718A (fr) * 1965-07-12 1966-06-24 Air Liquide Perfectionnements à des procédés métallurgiques
US3313619A (en) * 1961-03-24 1967-04-11 Lorraine Laminage Iron refining processes
US3330645A (en) * 1962-08-07 1967-07-11 Air Liquide Method and article for the injection of fluids into hot molten metal
US3706549A (en) * 1968-02-24 1972-12-19 Maximilianshuette Eisenwerk Method for refining pig-iron into steel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2875037A (en) * 1953-03-17 1959-02-24 Pennsylvania Engineering Corp Method of making bessemer or converter steel
US2855293A (en) * 1955-03-21 1958-10-07 Air Liquide Method and apparatus for treating molten metal with oxygen
US3313619A (en) * 1961-03-24 1967-04-11 Lorraine Laminage Iron refining processes
US3330645A (en) * 1962-08-07 1967-07-11 Air Liquide Method and article for the injection of fluids into hot molten metal
FR1450718A (fr) * 1965-07-12 1966-06-24 Air Liquide Perfectionnements à des procédés métallurgiques
US3706549A (en) * 1968-02-24 1972-12-19 Maximilianshuette Eisenwerk Method for refining pig-iron into steel

Cited By (3)

* 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
US4002467A (en) * 1974-01-30 1977-01-11 Verfahrenstechnik Dr.-Ing. Kurt Baum Method for recovering reaction gases from steel converters which are bottom blown with oxygen and cooled with hydrocarbons
WO2019158479A1 (en) * 2018-02-16 2019-08-22 Sms Group Gmbh Method for refining molten metal using a converter

Also Published As

Publication number Publication date
FR2180132A1 (xx) 1973-11-23
FR2180132B3 (xx) 1976-04-02
BE782186A (fr) 1972-04-28
LU67353A1 (xx) 1973-06-18

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