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WO2025216680A1 - Agencement et procédé de production d'éponge de fer à partir de minerai de fer - Google Patents

Agencement et procédé de production d'éponge de fer à partir de minerai de fer

Info

Publication number
WO2025216680A1
WO2025216680A1 PCT/SE2025/050297 SE2025050297W WO2025216680A1 WO 2025216680 A1 WO2025216680 A1 WO 2025216680A1 SE 2025050297 W SE2025050297 W SE 2025050297W WO 2025216680 A1 WO2025216680 A1 WO 2025216680A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
reduction
heat exchanger
line
cooling
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/SE2025/050297
Other languages
English (en)
Inventor
Damian Andres GUIDO
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.)
Hybrit Development AB
Original Assignee
Hybrit Development AB
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 Hybrit Development AB filed Critical Hybrit Development AB
Publication of WO2025216680A1 publication Critical patent/WO2025216680A1/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
    • C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft 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
    • C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
    • C21B13/029—Introducing coolant gas in the shaft furnaces
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/02—Hydrogen or oxygen
    • C25B1/04—Hydrogen or oxygen by electrolysis of water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B1/22—Arrangements of heat-exchange apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B1/24—Cooling arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/10—Arrangements for using waste heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/10—Arrangements for using waste heat
    • F27D17/17—Arrangements for using waste heat for preheating fluids, e.g. air or gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F28D21/001—Recuperative heat exchangers the heat being recuperated from exhaust gases for thermal power plants or industrial processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2256/00—Main component in the product gas stream after treatment
    • B01D2256/16—Hydrogen
    • 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
    • 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
    • C21B2100/66—Heat exchange
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0056—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for ovens or furnaces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the present invention relates to an arrangement for producing sponge iron from iron ore, wherein the arrangement comprises a vertical reduction shaft having an inlet at an upper part of the reduction shaft for receiving a plurality of iron ore pellets, a reduction gas source, a first gas line extending from the reduction gas source to the reduction shaft, at least one reduction gas inlet for introduction of reduction gas into the reduction shaft, a reduction gas outlet for removal of top gas from the reduction shaft, a heater for heating the reduction gas in the first gas line, a cooling chamber provided downstream a reduction zone of the reduction shaft and arranged to receive reduced iron ore pellets from the reduction zone, a cooling gas inlet into said chamber, a cooling gas outlet from said chamber, provided upstream the cooling gas inlet as seen in the flow direction of the reduced iron ore pellets in said chamber, a second gas line extending outside said chamber from the cooling gas outlet of said chamber to the cooling gas inlet of said chamber, and a first heat exchanger arranged to exchange heat between the reduction gas in the first gas line and top gas obtained from the reduction shaft through
  • the object of the invention is achieved by means of an arrangement for producing sponge iron from iron ore, wherein the arrangement comprises:
  • cooling chamber provided downstream a reduction zone of the reduction shaft and arranged to receive reduced iron ore pellets from the reduction zone
  • the second heat exchanger being provided upstream the first heat exchanger in the first gas line as seen in the flow direction of the reduction gas from the reduction gas source to the direct reduction shaft; and in that the first heat exchanger is a counter-current heat exchanger.
  • the provision of the second heat exchanger will result in a preheating of the reduction gas that will enable the use of a counter-current heat exchanger as the first heat exchanger. Thereby, improved efficiency is obtained compared to prior art, while clogging and condensation of top gas is still prevented. Energy from the cooling circuit, which has been transferred from the reduced iron ore pellets to the cooling gas, is also taken advantage of.
  • the second heat exchanger is a co-current heat exchanger. Thereby, clogging and condensation of the cooling gas in the second gas line is prevented.
  • the reduction gas source comprises a hydrogen gas source.
  • the reduction gas source comprises an electric hydrolyzer for producing hydrogen gas from water.
  • the arrangement comprises a third gas line for conducting top gas from the reduction gas outlet to the first gas line, said third gas line being connected to the first gas line at a point upstream the second heat exchanger as seen in the flow direction of the reduction gas in the first gas line.
  • the first heat exchanger comprises a shell-and- tube heat exchanger.
  • a tube and shell heat exchanger is a device that transfers heat from one fluid to another fluid without them touching each other directly. It consists of a shell (a large pressure vessel) and a tube bundle. One fluid flows inside the tubes and the other fluid flows over the tubes.
  • the tubes and the shell are made of thermally conductive metals that allow easy heat transfer. The temperature difference between the two fluids is the driving force for heat exchange.
  • the first gas line is defined by a shell side of the first heat exchanger, and the top gas is conducted through the tube side of the first heat exchanger.
  • the second heat exchanger comprises a shell- and-tube heat exchanger.
  • the first gas line is defined by the shell side of the second heat exchanger and the second gas line is defined by the tube side of the second heat exchanger.
  • a gas cleaning arrangement in the third gas line for separating dust and water of the top gas from hydrogen gas of the top gas and removing the separated dust and water from the third gas line, and wherein said cleaning arrangement is provided downstream the first heat exchanger as seen in the flow direction of the top gas in the third gas line.
  • the object of the invention is also achieved by means of a method of producing sponge iron from iron ore, said method comprising the steps of: -introducing iron ore pellets into a vertical reduction shaft, -conducting a reduction gas from a reduction gas source to the reduction shaft through a first gas line,
  • the flow directions of the reduction gas and the cooling gas in the second heat exchanger are the same.
  • the second heat exchanger is a co-current type of heat exchanger.
  • the flow rate of the cooling gas in the second gas line is controlled such that the temperature of the reduction gas leaving the second heat exchanger is high enough to result in the temperature of the top gas in the first heat exchanger not going below the dew point of the top gas due to the heat exchange with the reduction gas in the first heat exchanger.
  • the flow rate of the cooling gas through the cooling zone in said chamber, and thus the flow rate of the cooling gas in the second gas line is controlled such that a predetermined pellets temperature at a pellets outlet from the chamber is achieved.
  • the pellets temperature should be below a predetermined level to avoid reactions between the pellets and the surrounding atmosphere.
  • the flow rate in the second gas line is thus dependent on the set outlet temperature of the pellets.
  • the flow rate in the second gas line is controlled such that the reduction gas gets a sufficiently high temperature before reaching the first heat exchanger, to prevent condensation of top gas in the latter.
  • the reduction gas from the reduction gas source comprises at least 80 mole% hydrogen, preferably at least 90 mole% hydrogen.
  • the method comprises the step of conducting top gas from the reduction gas outlet of the reduction shaft to the first gas line through a third gas line, said third gas line being connected to the first gas line at a point upstream the second heat exchanger as seen in the flow direction of the reduction gas in the first gas line.
  • the cooling gas comprises at least 80 mole% hydrogen, preferably at least 90 mole% hydrogen.
  • Fig.1 is a schematic representation of an arrangement according to the invention.
  • Fig. 1 shows an embodiment of an arrangement for producing sponge iron from iron ore according to the present invention.
  • the iron ore comprises iron ore pellets comprising iron oxide.
  • the arrangement comprises a vertical reduction shaft 1 having an inlet 2 at an upper part of the reduction shaft for receiving a plurality of iron ore pellets.
  • the arrangement further comprises a reduction gas source 3, a first gas line 4 extending from the reduction gas source 3 to the reduction shaft 1 , and a reduction gas inlet 5 for introduction of reduction gas into the reduction shaft 1 .
  • the arrangement further comprises a reduction gas outlet 6 for removal of top gas from the reduction shaft 1 and a heater 7 for heating the reduction gas in the first gas line 4.
  • a cooling chamber 8 provided downstream a reduction zone 9 of the reduction shaft 1 and arranged to receive reduced iron ore pellets from the reduction zone 9.
  • the chamber 8 is defined by a lower part of the reduction shaft 1 , just below the reduction zone 9.
  • Alternative embodiments may comprise a chamber which is more or less separated from the reduction shaft. According to another embodiment, not shown, the chamber is separated from the reduction shaft.
  • a cooling gas inlet 10 is provided for the introduction of a cooling gas into the chamber 8, and a cooling gas outlet 11 is provided for removal of cooling gas from the chamber 8.
  • the cooling gas outlet 11 is provided upstream the cooling gas inlet 10 as seen in the flow direction of the reduced iron ore pellets in said chamber 8.
  • a first heat exchanger 13 is arranged to exchange heat between the reduction gas in the first gas line 4 and top gas obtained from the reduction shaft 1 through the reduction gas outlet 6.
  • the first heat exchanger 13 is arranged upstream the gas heater 7 in the first gas line 4 as seen in the flow direction of the reduction gas from the reduction gas source 3 to the direct reduction shaft 1 .
  • the arrangement further comprises a second heat exchanger 14 arranged to exchange heat between the reduction gas in the first gas line 4 and gas in said second gas line 12, the second heat exchanger 14 being provided upstream the first heat exchanger 13 in the first gas line 4 as seen in the flow direction of the reduction gas from the reduction gas source 3 to the direct reduction shaft 1.
  • the first heat exchanger 13 is a counter-current heat exchanger
  • the second heat exchanger 14 is co-current heat exchanger
  • the reduction gas source 3 comprises a hydrogen gas source.
  • the reduction gas source 3 comprises an electric hydrolyzer for producing hydrogen gas from water.
  • the fourth gas line 15 is connected to the second gas line 12 downstream the second heat exchanger 14 as seen in the flow direction of the cooling gas in the second gas line 14 during operation of the arrangement.
  • the arrangement further comprises a third gas line 16 for conducting top gas from the reduction gas outlet 6 of the reduction shaft 1 to the first gas line 4, said third gas line 16 being connected to the first gas line 4 at a point upstream the second heat exchanger 14 as seen in the flow direction of the reduction gas in the first gas line 4.
  • the first heat exchanger 13 comprises a shell-and-tube heat exchanger.
  • a tube and shell heat exchanger is a device that transfers heat from one fluid to another fluid without them touching each other directly. It consists of a shell (a large pressure vessel) and a tube bundle. One fluid flows inside the tubes and the other fluid flows over the tubes.
  • the tubes and the shell are made of thermally conductive metals that allow easy heat transfer. The temperature difference between the two fluids is the driving force for heat exchange.
  • the first gas line 4 is defined by a shell side of the first heat exchanger 13, and the top gas is conducted through the tube side of the first heat exchanger 13.
  • the third gas line 16 thereby defines, i.e. is formed by, the tube side of the first heat exchanger 13.
  • the second heat exchanger 14 also comprises a shell-and-tube heat exchanger.
  • the first gas line 4 is defined by the shell side of the second heat exchanger and the second gas line 12 is defined by the tube side of the second heat exchanger 14.
  • a gas cleaning arrangement 17 in the third gas line 16 for separating dust and water of the top gas from hydrogen gas of the top gas and removing the separated dust and water from the third gas line 16.
  • the cleaning arrangement 17 is provided downstream the first heat exchanger 13 as seen in the flow direction of the top gas in the third gas line 16.
  • the second cleaning arrangement 19 is provided downstream the second heat exchanger 14 as seen in the flow direction of the cooling gas in the second gas line 12.
  • the flow rate of the cooling gas in the second gas line 12 is controlled such that the temperature of the reduction gas leaving the second heat exchanger 14 is high enough to result in the temperature of the top gas in the first heat exchanger 13 not going below the dew point of the top gas due to the heat exchange with the reduction gas in the first heat exchanger 13.
  • the reduction gas from the reduction gas source comprises 100% hydrogen gas.
  • the operation also comprises the step of conducting top gas from the reduction gas outlet 6 of the reduction shaft 1 to the first gas line 4 through the third gas line 16.
  • Fresh cooling gas comprising approximately 100% hydrogen gas, is conducted to the second gas line 12 from the reduction gas source 3 via the fourth gas line 15.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Manufacture Of Iron (AREA)

Abstract

L'invention concerne un agencement de production d'éponge de fer à partir de minerai de fer, l'agencement comprenant un arbre de réduction vertical (1), un premier échangeur de chaleur (13) agencé pour échanger de la chaleur entre un gaz de réduction dans une première conduite de gaz (4) et un gaz supérieur obtenu à partir de l'arbre de réduction (1). Un second échangeur de chaleur (14) est agencé pour échanger de la chaleur entre le gaz de réduction dans la première conduite de gaz (4) et un gaz de refroidissement pour le refroidissement de granulés réduits, le second échangeur de chaleur (14) étant disposé en amont du premier échangeur de chaleur (13) dans la première conduite de gaz (4) dans une vue dans la direction d'écoulement du gaz de réduction de la source de gaz de réduction (3) à l'arbre de réduction directe (1), et le premier échangeur de chaleur (13) est un échangeur de chaleur à contre-courant.
PCT/SE2025/050297 2024-04-12 2025-04-02 Agencement et procédé de production d'éponge de fer à partir de minerai de fer Pending WO2025216680A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE2450387A SE547032C2 (en) 2024-04-12 2024-04-12 An arrangement for and a method of producing sponge iron from iron ore
SE2450387-2 2024-04-12

Publications (1)

Publication Number Publication Date
WO2025216680A1 true WO2025216680A1 (fr) 2025-10-16

Family

ID=95252054

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2025/050297 Pending WO2025216680A1 (fr) 2024-04-12 2025-04-02 Agencement et procédé de production d'éponge de fer à partir de minerai de fer

Country Status (2)

Country Link
SE (1) SE547032C2 (fr)
WO (1) WO2025216680A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3422186A1 (de) * 1984-06-12 1985-12-12 Korf Engineering GmbH, 4000 Düsseldorf Verfahren zur direktreduktion von eisenerz oder eisenoxidpellets zu eisenschwamm und vorrichtung zur durchfuehrung dieses verfahrens
WO2011012964A2 (fr) * 2009-07-31 2011-02-03 Hyl Technologies, S.A. De C.V. Procédé de production de fer préréduit aux émissions limitées de co2

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5110350A (en) * 1983-05-16 1992-05-05 Hylsa S.A. De C.V. Method of reducing iron ore
CN1093883C (zh) * 1997-10-10 2002-11-06 伊尔萨有限公司 控制直接还原铁渗碳的方法和设备
US6562103B2 (en) * 2001-07-27 2003-05-13 Uop Llc Process for removal of carbon dioxide for use in producing direct reduced iron
IT202000015472A1 (it) * 2020-06-26 2021-12-26 Danieli Off Mecc Impianto di riduzione diretta e relativo processo
SE545600C2 (en) * 2021-06-22 2023-11-07 Hybrit Development Ab Hydrogen gas recycling in a direct reduction process

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3422186A1 (de) * 1984-06-12 1985-12-12 Korf Engineering GmbH, 4000 Düsseldorf Verfahren zur direktreduktion von eisenerz oder eisenoxidpellets zu eisenschwamm und vorrichtung zur durchfuehrung dieses verfahrens
WO2011012964A2 (fr) * 2009-07-31 2011-02-03 Hyl Technologies, S.A. De C.V. Procédé de production de fer préréduit aux émissions limitées de co2

Also Published As

Publication number Publication date
SE2450387A1 (en) 2025-04-08
SE547032C2 (en) 2025-04-08

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