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EP4396382A1 - Procédé de production d'une fonte de fer - Google Patents

Procédé de production d'une fonte de fer

Info

Publication number
EP4396382A1
EP4396382A1 EP22768692.0A EP22768692A EP4396382A1 EP 4396382 A1 EP4396382 A1 EP 4396382A1 EP 22768692 A EP22768692 A EP 22768692A EP 4396382 A1 EP4396382 A1 EP 4396382A1
Authority
EP
European Patent Office
Prior art keywords
gas
sponge iron
iron
carbon
carburized
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.)
Pending
Application number
EP22768692.0A
Other languages
German (de)
English (en)
Inventor
Frank AHRENHOLD
Roswitha Becker
Nils JÄGER
Daniel Schubert
Matthias Weinberg
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Steel Europe AG
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 ThyssenKrupp Steel Europe AG filed Critical ThyssenKrupp Steel Europe AG
Publication of EP4396382A1 publication Critical patent/EP4396382A1/fr
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0033—In fluidised bed furnaces or apparatus containing a dispersion of the material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0073—Selection or treatment of the reducing gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0086—Conditioning, transformation of reduced iron ores
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
    • C21B13/023—Making spongy iron or liquid steel, by direct processes in shaft furnaces wherein iron or steel is obtained in a molten state
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/12—Making spongy iron or liquid steel, by direct processes in electric furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
    • C21B2100/26—Increasing the gas reduction potential of recycled exhaust gases by adding additional fuel in recirculation pipes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
    • C21B2100/28—Increasing the gas reduction potential of recycled exhaust gases by separation
    • C21B2100/282—Increasing the gas reduction potential of recycled exhaust gases by separation of carbon dioxide
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
    • C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
    • C21B2100/64—Controlling the physical properties of the gas, e.g. pressure or temperature

Definitions

  • the sponge iron which is still hot after the reduction, is cooled with a cooling gas which comprises a mixture of carbon dioxide and hydrogen in a specific ratio.
  • a cooling gas which comprises a mixture of carbon dioxide and hydrogen in a specific ratio.
  • the carbon content in the sponge iron can be increased with the cooling gas.
  • the blast furnace routes will gradually be replaced by direct reduction plants in connection with smelting aggregates in order to cover the continuing global demand for steel.
  • direct reduction plants are being built on the mill floor not far from the existing blast furnace(s), so that parallel operation can also take place for a certain period of time, see, inter alia, EP 1 641 945 Bl. Due to climate-related restrictions or in order to achieve the ambitious climate goals, the direct reduction plants operated with natural gas according to the current state of the art will be operated with hydrogen or hydrogen-rich gases in the future.
  • This object is achieved by a method for producing an iron melt, comprising the steps: - reducing iron ore to sponge iron, - carburizing sponge iron with a carbon-containing gas, - melting the carburized sponge iron and/or treating the melt produced from the carburized sponge iron, wherein at least part of the process gas produced during the melting of the carburized sponge iron and/or the treatment of the melt produced from the carburized sponge iron is recycled as the carbon-containing gas.
  • the sponge iron With the carbon from the carbonaceous gas flowing through the sponge iron, the sponge iron is "carburized” so that carbon is deposited on the sponge iron. The deposited carbon then combines with the iron to form cementite (Fe 3 C).
  • the carbon content of the sponge iron after treatment with the carbon-containing gas is greater than 0.5% by weight, in particular greater than 1.0% by weight, preferably greater than 1.5% by weight and less than 4.5% by weight , in particular less than 4.0% by weight, preferably less than 3.5% by weight.
  • the hydrogen-containing reducing gas can also contain a mixture of methane (CH 4 ) and hydrogen (H 2 ).
  • the hydrogen-containing reducing gas can contain other components such as water vapor and unavoidable impurities such as sulfur compounds and/or nitrogen.
  • the melting is carried out in an electric furnace, in particular in an electric reduction furnace.
  • Submerged Electric Arc Furnace are resistance arc heating furnaces that form electric arcs between the electrode and the charge and/or slag or that heat the charge and/or slag using the Joule effect.
  • the electrode or electrodes if there are several
  • the submerged arc furnaces can be designed as alternating current arc reduction furnaces (SAFac) or direct current arc reduction furnaces (SAFdc).
  • the sponge iron coming from a reduction zone at a temperature of up to 800° C.
  • the sponge iron is cooled for further transport and/or storage.
  • the carbon-containing gas is supplied at a temperature below 100° C. to cool the sponge iron.
  • the carbonaceous gas has not only the function of carburizing but also that of cooling the sponge iron.
  • the carbon-containing gas is supplied at a temperature of at least 500°C.
  • the carbon-containing gas is heated to the required temperature in a gas heater.
  • This variant is used in particular for hot use of the sponge iron, preferably in an electric furnace.
  • the temperature can be raised in particular to at least 600°C, preferably to at least 700°C, preferably to at least 800°C, particularly preferably to at least 900°C, more preferably to at least 1000°C.
  • additives or additives (X) can be introduced both in the electric furnace (20) and in the blast furnace (50),
  • the iron melt from either the electric furnace (20) or from the blast furnace (50) is fed to a treatment of the melt produced from the carburized sponge iron in order to reduce the carbon of the melt to a necessary level.
  • a treatment of the melt produced from the carburized sponge iron in order to reduce the carbon of the melt to a necessary level.
  • oxygen blowing process particularly preferably in a converter.
  • the process gas produced by the treatment of the melt produced from the carburized sponge iron contains carbon and is at least partly recycled as a gas containing carbon. If the desired level of carburization can be maintained, no carbonaceous agents need to be added and the recycled process gas is sufficient as a carbonaceous gas for carburizing.
  • a carbon-containing gas (42) containing CO and/or CO 2 as the main component is introduced into the cooling zone (12) for carburizing and cooling.
  • the carburized and cooled sponge iron can either be introduced into the blast furnace (50) for melting or into the electric furnace (20).
  • the process gas from the blast furnace (50) or the process gas from the electric furnace (20) can be provided as a carbon-containing gas (42).
  • at least part of the process gas produced from the treatment of the melt produced from the carburized sponge iron can also be recycled as carbon-containing gas.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacture Of Iron (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

La présente invention concerne un procédé de production d'une fonte de fer, comprenant les étapes suivantes : réduction de minerai de fer en éponge de fer, carburation de l'éponge de fer avec un gaz contenant du carbone, fusion de l'éponge de fer carburée et/ou traitement de la fonte produite à partir de l'éponge de fer carburée. Selon l'invention, au moins une partie du gaz de processus produit lors de la fusion de l'éponge de fer carburée et/ou du traitement de la fonte produite à partir de l'éponge de fer carburée est recyclée en tant que gaz contenant du carbone.
EP22768692.0A 2021-08-30 2022-08-22 Procédé de production d'une fonte de fer Pending EP4396382A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021122351.2A DE102021122351A1 (de) 2021-08-30 2021-08-30 Verfahren zur Herstellung einer Eisenschmelze
PCT/EP2022/073307 WO2023030944A1 (fr) 2021-08-30 2022-08-22 Procédé de production d'une fonte de fer

Publications (1)

Publication Number Publication Date
EP4396382A1 true EP4396382A1 (fr) 2024-07-10

Family

ID=83280581

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22768692.0A Pending EP4396382A1 (fr) 2021-08-30 2022-08-22 Procédé de production d'une fonte de fer

Country Status (7)

Country Link
US (1) US20240344155A1 (fr)
EP (1) EP4396382A1 (fr)
JP (1) JP2024532378A (fr)
KR (1) KR20240041974A (fr)
CN (1) CN117881799A (fr)
DE (1) DE102021122351A1 (fr)
WO (1) WO2023030944A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023102815A1 (de) 2023-02-06 2024-08-08 Thyssenkrupp Steel Europe Ag Verfahren zur Direktreduktion von Eisenerz

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2026548B (en) * 1978-07-26 1983-03-30 Cons Natural Gas Svc Production of intermediate hot metal for steemaking
US4216011A (en) * 1979-04-23 1980-08-05 Hylsa, S.A. Method and apparatus for the secondary gaseous reduction of metal ores
US4224057A (en) * 1979-08-20 1980-09-23 Hylsa, S.A. Method for carburizing sponge iron
US4246024A (en) * 1979-10-31 1981-01-20 Grupo Industrial Alfa, S.A. Method for the gaseous reduction of metal ores using reducing gas produced by gasification of solid or liquid fossil fuels
DE3503493A1 (de) 1985-01-31 1986-08-14 Korf Engineering GmbH, 4000 Düsseldorf Verfahren zur herstellung von roheisen
DE19717304C2 (de) * 1997-04-24 1999-05-27 Metallgesellschaft Ag Verfahren zum Erzeugen von Eisencarbid aus körnigem Eisenschwamm
US6986800B2 (en) 2003-05-15 2006-01-17 Hylsa, S.A. De C.V. Method and apparatus for improved use of primary energy sources in integrated steel plants
DE102013104002A1 (de) * 2013-04-19 2014-10-23 Voestalpine Stahl Gmbh Verfahren zum Aufheizen von Prozessgasen für Direktreduktionsanlagen
DE102019217631B4 (de) 2019-11-15 2024-05-29 Thyssenkrupp Steel Europe Ag Verfahren zur Direktreduktion von Eisenerz

Also Published As

Publication number Publication date
WO2023030944A1 (fr) 2023-03-09
DE102021122351A1 (de) 2023-03-02
KR20240041974A (ko) 2024-04-01
US20240344155A1 (en) 2024-10-17
CN117881799A (zh) 2024-04-12
JP2024532378A (ja) 2024-09-05

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