WO2026037794A1 - Production d'une éponge de fer nitrurée - Google Patents

Production d'une éponge de fer nitrurée

Info

Publication number
WO2026037794A1
WO2026037794A1 PCT/EP2025/073039 EP2025073039W WO2026037794A1 WO 2026037794 A1 WO2026037794 A1 WO 2026037794A1 EP 2025073039 W EP2025073039 W EP 2025073039W WO 2026037794 A1 WO2026037794 A1 WO 2026037794A1
Authority
WO
WIPO (PCT)
Prior art keywords
cooling
gas
hydrogen
iron
exhaust gas
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
PCT/EP2025/073039
Other languages
German (de)
English (en)
Inventor
Bernhard Hiebl
Robert Millner
Gernot Polke
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.)
Primetals Technologies Austria GmbH
Original Assignee
Primetals Technologies Austria GmbH
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 Primetals Technologies Austria GmbH filed Critical Primetals Technologies Austria GmbH
Publication of WO2026037794A1 publication Critical patent/WO2026037794A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • C21B13/0073—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
    • 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
    • C21C1/08—Manufacture of cast-iron
    • 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 application relates to a method and a device for the nitriding of sponge iron.
  • the solid product of a direct reduction of iron oxide-containing material without the production of a melt is called sponge iron or DRI direct reduced iron.
  • H2 hydrogen
  • H2 can be used as the sole reducing gas or in combination with other gases, such as natural gas-based or synthesis gas-based reducing gases.
  • gases such as natural gas-based or synthesis gas-based reducing gases.
  • ammonia is also known to be used as a reducing agent.
  • Ammonia (NH3 ) offers significant advantages over hydrogen ( H2) with regard to storage and transport.
  • Ammonia NH3 can be split into nitrogen f N2 and hydrogen f H2.
  • Hydrogen (H2 ) can react as a reducing agent with metal oxides, for example iron oxides:
  • Ammonia NH3 can also act as a reducing agent itself:
  • a reducing gas containing ammonia can consist of ammonia ( NH3) or a mixture of ammonia (NH3 ) with one or more other substances. 202400244 several other gases - preferably one or more of which can have a reducing effect on iron oxide-containing material.
  • reducing gas obtained using ammonia NH3 can be used to reduce iron oxide-containing material; such a reducing gas can, for example, be ammonia NH3 , or a mixture of ammonia NH3 with one or more other gases - preferably one or more of which can have a reducing effect on iron oxide-containing material - which would be the case, for example, with a mixture of ammonia NH3 and its fission products hydrogen H2 and nitrogen N2 , whereby of course other gases could also be contained in the mixture.
  • a reducing gas can, for example, be ammonia NH3 , or a mixture of ammonia NH3 with one or more other gases - preferably one or more of which can have a reducing effect on iron oxide-containing material - which would be the case, for example, with a mixture of ammonia NH3 and its fission products hydrogen H2 and nitrogen N2 , whereby of course other gases could also be contained in the mixture.
  • the object of the present invention is to present a process which allows an energy- and resource-efficient process for a hydrogen-based direct reduction process in which ammonia NH 3 is used as a hydrogen source, with the provision of nitrided sponge iron.
  • the problem is solved by a process for the nitriding of sponge iron, comprising direct reduction of iron oxide-containing material to sponge iron, wherein hydrogen-containing reduction gas (H2 ) is used, wherein at least a subset of the hydrogen (H2 ) originates from the cracking of ammonia (NH3 ) , and wherein the reduction gas is supplied to a reduction reactor containing the iron oxide-containing material in an interior space, and comprising
  • Iron oxide-containing material is directly reduced to sponge iron with a reducing gas comprising hydrogen (H2 ) . Due to the thermodynamic and kinetic conditions necessary for the industrial implementation of direct reduction, the resulting sponge iron has a 202400244
  • the reducing gas can be pure hydrogen (H2 ) or a mixture of hydrogen ( H2) and one or more other gases. These other gases can be, for example, CO or CH4 .
  • Hydrogen (H2 ) can be obtained from ammonia (NH3 ) , but it can also be produced by electrolysis, from the reforming of natural gas, or from other sources such as syngas. At least a portion of the hydrogen (H2 ) originates from ammonia ( NH3) , being released by the splitting of ammonia (NH3 ) .
  • the reducing gas contains at least 15 volumes of hydrogen (H2 ) , particularly preferably 50 volumes, and most preferably 70 volumes.
  • the sponge iron cools down through heat transfer, while the ammonia (NH3 ) heats up.
  • this cooling can occur is, for example, by bringing ammonia (NH3 ) into contact with the sponge iron, causing endothermic decomposition reactions of the ammonia (NH3 ) – this cools the sponge iron.
  • the reduction zone and cooling zone are different zones of the reduction reactor.
  • the sponge iron to be cooled may already contain iron nitrides; in this case, the existing iron nitride content will increase during cooling with the addition of ammonia. However, it is also possible that the sponge iron to be cooled does not contain iron nitrides; in this case, the iron nitride content will increase from a zero level during cooling with the addition of ammonia. In any case, at the latest after cooling to below 450 °C, to which ammonia (NH3 ) contributes, nitrided sponge iron is present; and after cooling to below 450 °C, to which ammonia (NH3 ) contributes, the iron nitride content in the sponge iron is greater than before this cooling.
  • the iron nitride content is given, for example, as the weight of iron nitrides in a quantity of sponge iron. 202400244
  • Ammonia ( NH3 ) reacts with iron to form iron nitrides, thus nitriding the sponge iron.
  • the occurrence of nitridation depends on the temperature range in which the contact between ammonia (NH3 ) and iron takes place. Within the temperature range traversed during cooling according to the invention, nitridation of the sponge iron occurs. Accordingly, a nitrided sponge iron is obtained, which exhibits the advantages associated with its passivation achieved through nitridation.
  • the nitrided iron sponge after cooling to a temperature below 450 °C, has an iron nitride content of over 20 wt! , particularly preferably over 50 wt! , very preferably over 70 wt! , and most preferably over 90 wt! .
  • the reducing gas causes the reduction of the iron oxide-containing material; its reducing components are at least partially consumed in the process.
  • a so-called top gas, containing the spent reducing gas, is drawn off from the reduction zone of the reactor.
  • Cooling gas is produced during the cooling process. This cooling gas originates from the refrigerant gas while the refrigerant gas exerts a cooling effect.
  • the cooling gas differs from the fresh refrigerant gas supplied for cooling at least in its temperature—it is warmer—but it can also differ in its composition.
  • the cooling gas can contain one or more of the following components:
  • Nitrogen f N 2 and hydrogen f H 2 because these are the products of a splitting of ammonia NH 3 .
  • Cooling can take place in a cooling zone of the reduction reactor, or it can take place in a cooling reactor separate from the reduction reactor - in this case, the sponge iron produced in the reduction reactor at a temperature above 450 °C is fed to the cooling reactor.
  • Cooling gas is used to cool the sponge iron being cooled.
  • the cooling gas contains ammonia (NH3 ) , or it can consist entirely of ammonia (NH3 ) .
  • the degree of cooling depends on the amount of cooling gas supplied to the sponge iron.
  • the cooling process is regulated and/or controlled to achieve an optimal temperature profile for nitriding by changing the amount of cooling gas and/or the amount of ammonia (NH3 ) added.
  • the cooling process is controlled and/or regulated using information about the composition of the cooling exhaust gas, and/or temperature measurements inside the cooling zone or cooling reactor, and/or temperature measurements of the cooling exhaust gas.
  • a limit value can be set for the ammonia ( NH3) content of the cooling exhaust gas – for example, 0.1 volumes. A higher content indicates incomplete conversion of the ammonia ( NH3) supplied for cooling; accordingly, the flow of ammonia (NH3 ) for cooling could be reduced if more complete conversion is desired.
  • the cooling exhaust gas produced during cooling is removed - at least partially - from a) and/or b). 202400244
  • Discharged to the outside it is discharged from the reduction reactor or the cooling reactor to the outside.
  • Discharge to the outside means that the cooling exhaust gas leaves the reduction reactor or the cooling reactor during discharge; “outside” is to be understood as outside the reduction reactor or the cooling reactor. In the case of the reduction reactor, the cooling exhaust gas leaves the cooling zone of the reduction reactor to the outside.
  • a gas stream of the cooling exhaust gas is extracted.
  • the gas stream of the discharged cooling exhaust gas is not extracted from the reduction zone of the reduction reactor, but rather from the cooling zone; the gas stream of the discharged cooling exhaust gas does not pass through any other zones of the reduction reactor during discharge.
  • Top gas and discharged cooling exhaust gas are different gas streams.
  • At least a subset of the discharged cooling exhaust gas is separated into a
  • a hydrogen-enriched first gas stream and a nitrogen-enriched second gas stream can be carried out after processing; the processing can, for example, include one or more steps from the following list:
  • Each of the steps can be repeated multiple times.
  • a membrane process or a pressure swing adsorption (PSA) process or a vacuum pressure swing adsorption (VPSA) process or a cryogenic separation process may be used.
  • the hydrogen-enriched first gas stream contributes hydrogen to the reducing gas; this hydrogen, H2, is a component of the reducing gas. According to the invention, it is at least partially used in the production of the reducing gas.
  • the reducing gas can also contain other components, for example, hydrogen (H2 ) from other sources; it can also contain hydrogen ( H2) derived from the cracking of ammonia ( NH3) occurring outside of the cooling process.
  • the hydrogen (H2 ) can also be obtained by electrolysis, by reforming natural gas, or from other sources such as syngas or coke oven gas.
  • H2 hydrogen
  • other components of the reducing gas can be other gases; these other gases can be, for example, CO or CH4.
  • the hydrogen content of the hydrogen - enriched first gas stream is greater than 90 volume.
  • the hydrogen-enriched first gas stream can be used entirely to contribute hydrogen to the reducing gas; however, only a portion of the hydrogen-enriched first gas stream can be used to contribute hydrogen to the reducing gas. The remainder of the hydrogen-enriched first gas stream can be used for other purposes.
  • the remainder of the hydrogen-enriched first gas stream does not need to be used for other purposes; it can also be used for combustion or release at a flare without further use.
  • the process according to the invention comprises separating at least a subset of the discharged cooling exhaust gas; the entire discharged cooling exhaust gas can be subjected to separation, or there can also be cooling exhaust gas that has not been subjected to separation. Cooling exhaust gas that has not been subjected to separation can also be used for the other applications listed above for the first gas stream enriched with hydrogen, or can be fed to combustion or release at a flare without further use.
  • the nitrogen-enriched second gas stream can be used for the following purposes, for example:
  • the hydrogen-enriched first gas stream - can be used as fuel gas or for chemical processes such as syntheses.
  • a portion of the discharged cooling exhaust gas contributes to the cooling process.
  • the portion is fed to the sponge iron to be cooled, optionally with the addition of ammonia (NH3 ) .
  • NH3 ammonia
  • the gas pressure during cooling – for example, in the cooling zone of the reduction reactor or in the cooling reactor – is controlled and/or regulated by controlling and/or regulating the quantity of the subset of the discharged cooling exhaust gas fed to the separation process. Controlling and/or regulating the gas pressure during cooling is necessary for the controlled operation of any industrial process.
  • the first gas stream contributes hydrogen (H2 ) to the reducing gas; it is preferred to heat the hydrogen (H2 ) of the first gas stream by heat exchange with the discharged cooling exhaust gas.
  • the hydrogen (H2 ) in the first gas stream can be heated, i.e., the first gas stream itself can be heated – but it can also be a precursor of the reducing gas, which contains the hydrogen (H2 ) of the first gas stream, that is heated.
  • the hydrogen (H2 ) of the first gas stream can also be heated by means of a heating device – for example, a reduction gas furnace or an electric heater.
  • a heating device — for example, a reduction gas furnace or an electric heater.
  • the second gas stream can optionally be heated – completely or partially.
  • the hydrogen (H2 ) in the first gas stream can be heated, i.e., the first gas stream can be heated – but a precursor of the reducing gas, which contains the hydrogen (H2 ) of the first gas stream, can also be heated.
  • a further subject matter of the present application is a device for the nitriding of sponge iron, comprising a device for the direct reduction of iron oxide-containing material to sponge iron with a reduction reactor and a supply line for supplying reducing gas and/or a precursor of the reducing gas to the reduction reactor, and comprising a cooling device for cooling the sponge iron to a temperature below 450 °C, wherein an ammonia supply line opens into the cooling device, characterized in that a cooling exhaust gas line extends from the cooling device for the discharge of cooling exhaust gas generated during cooling to the outside, which opens into a gas separation device for separating, optionally treated, cooling exhaust gas into a hydrogen-enriched first gas stream and a nitrogen-enriched second gas stream, wherein a 202400244
  • the hydrogen gas stream outlet is used to discharge the first gas stream, and the hydrogen gas stream outlet has an opening into the supply line.
  • a reduction reactor is, for example, a reduction shaft – such as in a direct reduction process using a reduction shaft containing a fixed bed of iron oxide-containing material.
  • a reduction reactor can be a fluidized bed reactor – for example, in a direct reduction process using a reduction reactor containing a fluidized bed of iron oxide-containing material.
  • the fluidized bed reactor can also comprise several individual sub-reactors, which may be connected in parallel or sequentially, forming the fluidized bed reactor.
  • a precursor to the reducing gas is present, from which the reducing gas is prepared. If it is a precursor, further steps are required, such as adding additional components, heating to the desired temperature for introduction into the reduction reactor, or chemical reactions leading to a change in composition. Preparation can be achieved, for example, by adding further components or heating. Preparation can also occur through chemical reactions taking place within the precursor without external intervention, which, for example, change the chemical composition or the temperature.
  • the gas separation device can be, for example, a device for carrying out a membrane process, a pressure swing adsorption (PSA) process, a vacuum pressure swing adsorption (VPSA) process, or a cryogenic separation process.
  • a gas separation device is understood to be a device in which various molecularly and/or atomically present components of a gas stream, which is a mixture of several gases, are separated from one another, so that several streams enriched or depleted with respect to these components are produced.
  • the process step of separating the discharged cooling exhaust gas into a hydrogen-enriched first gas stream and a nitrogen-enriched second gas stream is also preferably understood in this sense.
  • At least a subset of the hydrogen-enriched first gas stream is used as a component in the preparation of the reducing gas.
  • a subset occurs both when, with an unchanged composition of the top gas, only a subset of the resulting volume of the first gas stream is used, and when not all components of the first gas stream are used – for example, when an enrichment of a component – such as enrichment of hydrogen H2 – takes place and the correspondingly enriched gas stream is used completely or partially.
  • the cooling device for cooling the sponge iron is designed as a cooling reactor.
  • the cooling reactor differs from the reduction reactor; both the reduction reactor and the cooling reactor are... 202400244
  • a device for controlling and/or regulating the gas pressure during cooling is .
  • a feed line for supplying a second gas stream - completely or partially - as fuel f or fuel f component to the reduction gas furnace may be provided.
  • Another subject matter of the present application is a signal processing device with machine-readable program code, characterized in that it includes control and/or regulation commands for carrying out a method according to the invention.
  • a further subject matter is a signal processing device for carrying out a method according to any one of claims 1 to 9.
  • Another subject matter of the present application is a machine-readable program code for a signal processing device, characterized in that the program code includes control and/or regulation commands which cause the signal processing device to carry out a method according to the invention.
  • the program code includes control and/or regulation commands which cause the signal processing device to carry out a method according to the invention.
  • the further object is a computer program product comprising commands for a signal processing device which, when the program for the signal processing device is executed, cause it to carry out the method according to one of claims 1 to 9.
  • Another subject matter of the present application is a storage medium with machine-readable program code according to the invention stored thereon.
  • a further subject matter is a storage medium with a computer program stored thereon for carrying out a method according to any one of claims 1 to 9.
  • Fig. 1 is a schematic representation of a process according to the invention.
  • Fig. 2 shows a schematic representation of another variant of a process sequence according to the invention.
  • Fig. 3 shows a schematic representation of a further variant of a process sequence according to the invention.
  • Figure 1 schematically shows the process sequence according to the invention.
  • Iron oxide-containing material 1 is placed in a reduction reactor 2 – shown schematically as an example. 202400244
  • the hydrogen oxide material is fed into the reactor and directly reduced to sponge iron using a hydrogen-containing reduction gas ( H2 ).
  • H2 hydrogen-containing reduction gas
  • a portion of the hydrogen (H2 ) originates from the cracking of ammonia (NH3 ) .
  • the reduction gas is supplied to the reduction reactor 2, which contains the iron oxide-containing material, via the feed line 3.
  • the sponge iron is cooled to a temperature below 450 °C in a cooling device 4.
  • the cooling device 4 is shown as a separate cooling reactor from the reduction reactor 2; the sponge iron from the reduction reactor 2 is fed to the cooling reactor via the material feed line 5.
  • An ammonia supply line 6 leads into the cooling device 4.
  • nitrided iron sponge is produced from the iron sponge, which is the product of the direct reduction in the reduction reactor 2.
  • the nitrided iron sponge has an iron nitride content of over 20 wt!, and particularly preferably, an iron nitride content of over 50 wt!.
  • Cooling exhaust gas produced during cooling is discharged via the cooling exhaust gas line 7 leading from the cooling device 4.
  • This line opens into a gas separator 8 for separating the cooling exhaust gas into a hydrogen-enriched first gas stream and a nitrogen-enriched second gas stream.
  • a hydrogen gas stream outlet 9 extends from the gas separator 8 for the discharge of the first gas stream.
  • the hydrogen gas stream outlet 9 has an opening into the supply line 3. This allows the 202400244
  • Hydrogen f H 2 of the first gas stream contributes to the reducing gas.
  • the cooling exhaust gas line may contain one or more treatment devices – for example, for cooling, dust removal, or compression – which are not shown separately for clarity. In this case, the appropriately treated cooling exhaust gas is fed to the gas separation device 8.
  • a device for controlling and/or regulating the cooling process to achieve an optimal temperature profile for nitriding by changing the amount of cooling gas and/or the amount of ammonia (NH3 ) added may be provided, preferably being suitable for controlling and/or regulating the cooling process using information about the composition of the cooling exhaust gas, and/or temperature measurements inside the cooling device, and/or temperature measurements of the cooling exhaust gas. For clarity, this is not shown in Figure 1.
  • Figure 2 schematically shows another variant of a process sequence according to the invention.
  • Figure 2 is largely analogous to Figure 1, but differs, among other things, in that a recirculation line 10 is present, which branches off from the cooling exhaust gas line 7 and opens into the ammonia supply line 6. This allows a portion of the discharged cooling exhaust gas to contribute to the cooling process.
  • a recirculation line 10 is present, which branches off from the cooling exhaust gas line 7 and opens into the ammonia supply line 6. This allows a portion of the discharged cooling exhaust gas to contribute to the cooling process.
  • a device for controlling and/or regulating the size of the portion of the discharged cooling exhaust gas supplied to the gas separation device. 202400244
  • This can be a device for controlling and/or regulating the gas pressure during cooling.
  • a heat exchanger for heating the hydrogen (H2 ) of the first gas stream by heat exchange with the discharged cooling exhaust gas may be provided in the hydrogen gas outlet 9 and/or the supply line 3. This is not shown for clarity.
  • a heating device – for example, a reducing gas furnace or electric heater – can be provided in the hydrogen gas stream outlet 9 and/or the supply line 3 for heating the hydrogen H2 of the first gas stream.
  • An example of such an optionally present reducing gas furnace 11 in the hydrogen gas stream outlet 9 is shown with dashed lines.
  • the reduction gas furnace 11 operates by combustion of a fuel fs.
  • a feed line 12 supplies a second gas stream as
  • Figure 3 schematically shows another variant of a process sequence according to the invention, largely analogous to Figure 1.
  • Figure 3 differs from Figure 1 in that the cooling device for cooling the sponge iron is designed as a section 13 of the reduction reactor 2. The cooling device is thus integrated into the reduction reactor 2; it is a cooling zone of the reduction reactor 2. 202400244

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Manufacture Of Iron (AREA)

Abstract

L'invention concerne un procédé de nitruration d'une éponge de fer, consistant à réaliser une réduction directe au moyen d'un gaz réducteur comprenant de l'hydrogène H2, l'hydrogène H2 provenant au moins en partie de la dissociation de l'ammoniac NH3. Après la réduction directe dans un réacteur de réduction, l'éponge de fer est refroidie à une température inférieure à 450 °C. L'ammoniac NH3 contribue à ce refroidissement. Le gaz d'échappement de refroidissement produit lors du refroidissement est évacué et soumis à une séparation en un premier flux gazeux enrichi en hydrogène et en un deuxième flux gazeux enrichi en azote. Le premier flux de gaz apporte de l'hydrogène H2 au gaz réducteur. Un dispositif de nitruration d'éponge de fer comprend un dispositif de réduction directe de matériau contenant de l'oxyde de fer en éponge de fer, comprenant un réacteur de réduction (1) et une conduite d'alimentation (3) destinée à l'alimentation en gaz de réduction et/ou en un précurseur du gaz de réduction au réacteur de réduction (1), et un dispositif de refroidissement (4) pour le refroidissement de l'éponge de fer à une température inférieure à 450 °C. Une conduite d'alimentation en ammoniac (6) débouche dans le dispositif de refroidissement (4). Une conduite de gaz d'échappement de refroidissement (7) débouchant dans un dispositif de séparation de gaz (8) s'étend à partir du dispositif de refroidissement (4). Une conduite d'évacuation de flux de gaz hydrogène (9) destinée à l'évacuation du premier flux de gaz, laquelle débouche dans la conduite d'amenée (3), s'étend à partir du dispositif de séparation de gaz (8).
PCT/EP2025/073039 2024-08-14 2025-08-12 Production d'une éponge de fer nitrurée Pending WO2026037794A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP24194542 2024-08-14
EP24194542.7 2024-08-14
EP24209708 2024-10-30
EP24209708.7 2024-10-30

Publications (1)

Publication Number Publication Date
WO2026037794A1 true WO2026037794A1 (fr) 2026-02-19

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WO (1) WO2026037794A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2021281774A1 (en) * 2020-05-28 2022-12-01 Nippon Steel Corporation Method for producing reduced iron
AU2021267807A1 (en) * 2020-05-04 2022-12-15 Hybrit Development Ab Process for the production of carburized sponge iron
WO2023036474A1 (fr) * 2021-09-13 2023-03-16 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé de production de fer réduit direct pour une installation sidérurgique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2021267807A1 (en) * 2020-05-04 2022-12-15 Hybrit Development Ab Process for the production of carburized sponge iron
AU2021281774A1 (en) * 2020-05-28 2022-12-01 Nippon Steel Corporation Method for producing reduced iron
WO2023036474A1 (fr) * 2021-09-13 2023-03-16 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procédé de production de fer réduit direct pour une installation sidérurgique

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