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WO2013094864A1 - Appareil de fabrication de fer fondu et procédé de fabrication de fer fondu - Google Patents

Appareil de fabrication de fer fondu et procédé de fabrication de fer fondu Download PDF

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Publication number
WO2013094864A1
WO2013094864A1 PCT/KR2012/008251 KR2012008251W WO2013094864A1 WO 2013094864 A1 WO2013094864 A1 WO 2013094864A1 KR 2012008251 W KR2012008251 W KR 2012008251W WO 2013094864 A1 WO2013094864 A1 WO 2013094864A1
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WIPO (PCT)
Prior art keywords
molten iron
gasifier
furnace
carbon
containing material
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.)
Ceased
Application number
PCT/KR2012/008251
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English (en)
Korean (ko)
Inventor
김정일
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.)
Posco Holdings Inc
Original Assignee
Posco Co Ltd
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Filing date
Publication date
Application filed by Posco Co Ltd filed Critical Posco Co Ltd
Priority to CN201280063743.2A priority Critical patent/CN104024442B/zh
Publication of WO2013094864A1 publication Critical patent/WO2013094864A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • C21B13/143—Injection of partially reduced ore into a molten bath
    • 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
    • C21B11/00—Making pig-iron other than in blast 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
    • C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
    • C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
    • C21B13/002—Reduction of iron ores by passing through a heated column of carbon
    • 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
    • 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

Definitions

  • the present invention relates to an apparatus for manufacturing molten iron and a method for manufacturing molten iron, and more particularly, to a molten iron manufacturing apparatus and method for reducing iron ore or reduced iron by injecting a reducing gas produced by burning a carbon-containing material outside of a molten iron in a furnace. It is about.
  • Finex melt reduction process which consists of a multi-stage flow reduction furnace and a melt gasification furnace
  • operations are performed by injecting pulverized coal into the melt gasifier, but instead of directly injecting pulverized coal, which is a solid fuel, the reduction gas generated by burning pulverized coal is melted.
  • Direct blowing into the furnace may be more advantageous for the final reduction of reduced iron.
  • the ash component in the pulverized coal is mainly composed of alumina (Al 2 O 3 ) and silica (SiO 2 ), which causes a problem of lowering the flowability of slag due to its very high melting point.
  • the pulverized coal used in the steelmaking process is burned from the outside without directly blowing into the blast furnace, Finex melting furnace, Corex melting furnace to produce a reducing gas and blow it into the furnace to reduce iron ore or reduced iron.
  • the purpose is to provide the technology.
  • a molten iron manufacturing apparatus for achieving the above object is a drying device for drying the carbon-containing material using the exhaust gas discharged from the steelmaking process, the dried carbon-containing through the conduit connected to the drying device After charging the material and burning with hot air or oxygen at high temperature to produce a reducing gas, and connected with the gasifier through a conduit, by charging iron ore or reducing iron in the furnace and blowing the reducing gas through a vent A molten iron furnace for producing molten iron.
  • Drying apparatus for drying carbon-containing material by using exhaust gas discharged from steel making process, gasification furnace for producing reducing gas by charging the dried carbon-containing material and burning by hot hot air or oxygen, and iron ore in furnace Or a molten iron furnace for charging molten iron and blowing the reducing gas to produce molten iron.
  • the molten iron manufacturing apparatus further includes a hot stove for supplying a hot hot air to the gasifier.
  • the molten iron manufacturing apparatus further includes an exhaust gas supply device for supplying the exhaust gas discharged from the molten iron furnace to the gasifier.
  • the drying apparatus is characterized in that the partial combustion of the exhaust gas discharged from the steelmaking process to remove or reduce the water or volatile materials contained in the carbon-containing material.
  • the furnace is characterized in that any one of the blast furnace, Finex melt gasifier and Corex melt gasifier.
  • the hydrogen (H 2 ) content of the reducing gas is characterized in that less than 30%.
  • the pressure of the gasifier is characterized in that less than 5bar 20bar.
  • the temperature of the reducing gas produced in the gasifier is characterized in that 1,000 °C or more.
  • the carbon-containing material is at least one selected from the group consisting of coal, pulverized coal, power coal, RDF, RPF and biomass.
  • the molten iron manufacturing method is to dry the carbon-containing material by using the exhaust gas discharged from the steelmaking process, charging the dried carbon-containing material in the gasifier to burn to produce a reducing gas And charging iron ore or reducing iron in the furnace and reducing the blowing gas.
  • the molten iron manufacturing method further includes the step of blowing the exhaust gas discharged after reducing the iron ore or reduced iron in the gasifier.
  • the drying of the carbon-containing material is characterized in that the partial combustion of the exhaust gas discharged from the steelmaking process to remove or reduce the water or volatile substances contained in the carbon-containing material.
  • the production of the reducing gas is characterized by blowing hot gas or oxygen into the gasifier.
  • the furnace is characterized in that any one of the blast furnace, Finex melt gasifier, and Corex melt gasifier.
  • the hydrogen (H 2 ) content of the reducing gas is characterized in that less than 30%.
  • the pressure of the gasifier is characterized in that less than 20 bar 5 bar.
  • the temperature of the reducing gas produced in the gasifier is characterized in that 1,000 °C or more.
  • the carbon-containing material is at least one selected from the group consisting of coal, pulverized coal, power coal, RDF, RPF and biomass.
  • molten iron can be produced from low-grade ore having a high gangue component.
  • FIG. 1 is a view showing the configuration of an apparatus for producing molten iron by blowing the reducing gas generated by the gasifier according to an embodiment of the present invention to the blast furnace.
  • FIG. 2 is a view showing the configuration of an apparatus for producing molten iron by blowing a reducing gas generated by a gasifier according to another embodiment of the present invention into a Finex melt gasifier or a multi-stage flow reduction reactor.
  • FIG. 3 is a view showing the configuration of an apparatus for producing molten iron by blowing a reducing gas generated by a gasifier according to another embodiment of the present invention into a corex melt gasifier or a shaft furnace.
  • Figure 4 is a process chart for a molten iron manufacturing method according to another embodiment of the present invention.
  • the molten iron manufacturing apparatus is a drying apparatus 10 for drying the carbon-containing material by using the exhaust gas discharged from the steelmaking process, after charging the dried carbon-containing material high temperature Gas furnace 20 for producing reducing gas by burning by hot air or oxygen, and iron furnace 50, 60, 70 for charging iron ore or reduced iron in the furnace and injecting the reducing gas to produce molten iron. .
  • the carbon-containing material may include lower coal (lower coal), pulverized coal, power coal, RDF (Refuse Derived Fuel) / Refuse Plastic Fuel (RPF), biomass, and the like, but is not limited thereto. Any fuel for producing (manufacturing) reducing gas can be used.
  • RDF Refuse Derived Fuel
  • the raw material of RDF may be polyvinyl chloride, paper, plastic, wood, fiber, food, and the like.
  • RPF Refuse Plastic Fuel
  • Exhaust gases emitted from the steelmaking process are blast furnace flue gas (BFG) and shafts of the COREX ® process, flue gas from the FINEX ® flow reduction reactor, flue gas from the coke oven (COG) and steelmaking.
  • BFG blast furnace flue gas
  • FINEX ® flow reduction reactor flue gas from the FINEX ® flow reduction reactor
  • COG coke oven
  • the gasifier 20 is a device that generates a desired gas from the carbon-containing material that is solid by partially burning the carbon-containing material using oxygen or hot air (air).
  • Gasification furnace 20 of the present invention is a device for generating carbon monoxide (CO), hydrogen (H 2 ) required for the reduction of iron ore.
  • the apparatus for manufacturing molten iron further includes a hot stove 30 for supplying hot gas to the gasifier 20.
  • the heat source for the combustion after charging the carbon-containing material in the gasifier 20 may be supplied by blowing hot air (air) or oxygen of 1,000 °C ⁇ 1,200 °C supplied by heating up in the hot stove (30).
  • the shape of the hot stove 30 is a cylinder made of iron plate, the firebrick is stacked in a grid shape in the outer shell of the cylinder.
  • flue gas from the furnace ie blast furnace gas from the furnace, flue gas into the shaft of the Corex process, flue gas from the Finex flow reduction reactor or coke oven from the coke oven (coke oven) gas (COG) is burned and preheated, and then cold air (air) is sent between the brick layers to produce hot air.
  • the temperature of this hot air is 1,000 degreeC or more.
  • the preheated hot air is blown into the gasifier 20.
  • the reducing gas generated in the gasifier 20 may include carbon monoxide (CO), hydrogen (H 2 ) as well as volatile substances such as methane (CH 4 ) for the reduction of iron ore or reduced iron, thereby reducing the temperature of the reducing gas. It is preferable to keep it at 1,000 degreeC or more which is the temperature which methane etc. can decompose
  • the hot stove 30 is generally used, the hot stove 30 is additionally constructed. It is possible in the present invention to use the hot blast furnace 30 of the blast furnace operation as it is.
  • the molten iron manufacturing apparatus further includes an exhaust gas supply device 40 for supplying the exhaust gas discharged from the molten iron furnace to the gasifier (20).
  • the furnace may include a blast furnace 50, a melt gasifier 60 in a Finex ® process, a melt gasifier in a Corex ® process.
  • FINEX ® PROCESS charges secondary raw materials such as iron ore, limestone and dolomite in a multi-stage flow reduction reactor and flows them down in a reduction furnace in sequence to reduce molten iron with coal in a molten gasifier (60). It refers to the process of making molten iron by charging and blowing oxygen through the tuyere from the bottom of the furnace.
  • the molten gasifier 60 is charged with coal and reduced iron and blows oxygen to produce reducing gas such as carbon monoxide and hydrogen by combustion of coal and molten reduced iron by heat of coal ash.
  • the reducing gas generated in the gasifier 20 may be blown into the Finex melt gasifier 60 or the multi-stage flow reduction reactor 65.
  • the reducing gas may be blown into the molten gasifier 60 as well as the multistage flow reduction reactor 65 to be used for the reduction of iron ore.
  • the exhaust gas discharged from the blast furnace 50 of the molten iron furnace has a low temperature of about 200 ° C., which is blown into the gasifier 20, and the temperature of the reducing gas discharged from the gasifier 20 is about 1,100 ° C.
  • the drying apparatus 10 is for pretreatment such as storage and drying of a carbon-containing material, and partially burns the exhaust gas discharged from the steelmaking process to remove moisture or a volatile material (VM) contained in the carbon-containing material. It is characterized by removing or reducing.
  • VM volatile material
  • the water contained in the carbon-containing material is in the form of water (H 2 O), the volatile material is mostly present as a hydrocarbon (hydrocarbon) compound, when entering the reduction reaction of the steelmaking process without pretreatment process, It can be cause.
  • H 2 O water
  • hydrocarbon hydrocarbon
  • freeze drying For pretreatment to remove water and volatile substances from carbon-containing materials, freeze drying, vacuum drying, forced circulation (hot air) drying, drying with absorbents, and indirect drying using heat exchangers can be used.
  • a direct drying method of a high temperature convection method using an off-gas (main gas) which is a by-product gas of a steel mill may be used.
  • the top gas generated in the steelmaking process has a latent heat of 200 ° C. or less, while carbon monoxide (CO) and hydrogen (H 2 ) which do not participate in the reduction reaction in the reduction process are partially present in the top gas. This allows for efficient pretreatment of water and volatiles from carbonaceous materials.
  • the exhaust gas (clean gas) used for drying is used as it is or the partial amount is burned to burn the temperature. It can be made into 200 degrees C or less, and can dry.
  • coal having a high volatile content and a relatively high ignition point
  • coal is partially burned by incorporating oxygen or air into the flue-gas (main gas) and dried to increase the temperature.
  • the temperature of the partially burned gas can be maintained above the flash point for drying efficiency. This is because the oxygen gas is not present in the part gas which is partially burned and the temperature is raised, and thus, even if it is dried above the ignition point, no ignition occurs, and thus pretreatment is possible at a high temperature for the efficiency of drying and devolatile material.
  • the pretreatment method may be a method using a fluidized bed in which heat exchange and gas convection may occur well, and the drying method using the fluidized bed may be performed by injecting a partially combusted exhaust gas into a chamber (a container) filled with carbon-containing material, It is desirable to adjust the temperature and speed of the exhaust gas in accordance with the drying rate or the particle size of the carbon-containing material.
  • Exhaust gas discharged from the steelmaking process includes flue gas generated in a blast furnace, that is, blast furnace flue gas discharged from the blast furnace, Finex flue gas generated in the flow reduction furnace of the Finex process, Corex flue gas generated in the shaft furnace of the Korex process.
  • the exhaust gas discharged from the steelmaking process may include coke oven gas generated in the coke oven, converter gas generated in the converter.
  • the temperature of the carbon-containing material is heated to a range of 100 ° C to 700 ° C.
  • the moisture- and volatile material is evaporated in advance before charging into the gasifier 20 so that the carbon-containing material is burned in the gasifier 20 to reduce the gas.
  • the hydrogen (H 2 ) content of the reducing gas is characterized in that less than 30%.
  • the hydrogen content in the reducing gas blown into the furnace for the reduction of iron ore or reduced iron exceeds 30%, the reduction of iron ore by hydrogen is an endothermic reaction, as shown below in the iron ore reduction equation. Thermal deficiency may occur at, which is undesirable.
  • reaction formula When iron ore is reduced by hydrogen or carbon monoxide, the reaction formula is as follows.
  • the pressure of the gasifier 20 is characterized in that less than 5bar 20bar.
  • the pressure under the blast furnace 50 is usually 4 atm. Since the pressure in the bottom of the Finex melt reduction reactor or the Corex melt reduction furnace is usually 5 atm or higher, it is preferable to maintain the pressure in the gasifier 20 at 5 bar (bar) or more. It is not preferable because of the excessive input of material cost for the pressure resistance design, such as the addition of equipment for explosion prevention (20) and the increase of the thickness of the bar shell.
  • the temperature of the reducing gas produced in the gasifier 20 is characterized in that 1,000 °C or more.
  • the reducing gas preferably contains carbon monoxide, hydrogen, or the like, by decomposing hydrocarbon compounds such as methane, and is preferably maintained at 1,000 ° C. or higher, which is equal to or higher than the decomposition temperature of methane.
  • FIG. 3 is a view showing an apparatus for preparing molten iron by injecting a reducing gas prepared by burning a carbon-containing material externally in a Korex melt reduction process according to another embodiment of the present invention.
  • Corex process (COREX ® PROCESS) is a steelmaking process for manufacturing molten iron using coal and ore directly, such as Finex process shown in Figure 2 or pellets, lump ore with an iron ore particle size of 8 ⁇ 30mm is used, Its particle size is 8 ⁇ 50mm and uses ingot and fuel, and it is different from the FINEX process in that the reduction reactor is a shaft furnace, not a flow furnace.
  • reducing gas generated by pretreatment (gasification) of low-grade coal from the outside without the need of directly blowing pulverized coal is smelted in a furnace, that is, a blast furnace 50, a Finex melt reduction furnace, or Korex.
  • a furnace that is, a blast furnace 50, a Finex melt reduction furnace, or Korex.
  • FIG. 4 is a process chart of the molten iron manufacturing method according to another embodiment of the present invention.
  • molten iron manufacturing method is a step of drying the carbon-containing material by using the exhaust gas discharged from the steelmaking process (S10), by charging the dried carbon-containing material in the gasifier 20 and then burned Producing a reducing gas (S20), and charging the iron ore or reduced iron in the furnace and reducing the blowing gas (S30).
  • the molten iron manufacturing method further includes the step of blowing the exhaust gas discharged after reducing the iron ore or reduced iron in the gasifier (20).
  • the gas produced in the gasifier 20 is a temperature of the hot air (air) heated up in the hot stove 30 is 1,000 °C ⁇ 1,200 °C, the temperature of the reducing gas generated by the combustion in the gas furnace than the temperature of the hot wind Since the increase, various technical problems such as heat loss, pipe problems, volume increase, etc. may occur.
  • the CO 2 discharged to the outside is recycled to 1 mole of carbon. Since it can generate 2 moles of carbon monoxide (CO), by supplying the exhaust gas generated by iron ore reduction to the gasifier 20, not only can control the temperature of the final reducing gas, but also amplify the carbon dioxide recycling and CO gas amount You can.
  • CO carbon monoxide
  • Drying the carbon-containing material is characterized in that the partial combustion of the exhaust gas discharged from the steelmaking process to remove the water or volatile substances contained in the carbon-containing material.
  • the volatile material (VM) along with moisture is higher than that of ordinary coal.
  • Such volatiles are mostly volatiles such as hydrogen and methane.
  • the carbon-containing material contains a lot of such volatile substances, a lot of hydrogen, methane, etc. are generated when the carbon-containing material is burned, and as a result, the hydrogen content is increased in the reducing gas. If the reducing gas has a high hydrogen content, heat deficiency may occur in the iron making process, so it is desirable to maintain the hydrogen content below a certain ratio.
  • the exhaust gas discharged from a steel making process is a blast furnace off-gas comprises a flue-gas by, korekseu process;; off-gas (FOG FINEX ® Off-Gas) by (Blast Furnace Gas BFG), Finex process.
  • the exhaust gas may be a coke oven gas (COG), converter gas generated in the steelmaking process may be used.
  • COG coke oven gas
  • Partial combustion of carbon monoxide (CO) contained in the exhaust gas increases the temperature of the exhaust gas, and if it passes through the carbon-containing material, the temperature of the carbon-containing material is lower than the flash point (about 400 ° C in the case of coal and And water or volatile matter (VM) contained in the carbonaceous material may be evaporated and removed.
  • CO carbon monoxide
  • VM volatile matter
  • blast furnace flue gas contains about 25% of carbon monoxide as well as carbon dioxide, it is possible to pretreat the carbon-containing material by partially burning it. As a result, it is possible to control the composition of the reducing gas by recycling the blast furnace flue gas which is mostly discarded due to low heat.
  • the production of the reducing gas is characterized by blowing hot gas or oxygen into the gasifier 20.
  • the gasifier 20 may produce reducing gas by charging coal, pulverized coal, power coal, RDF / RPF, biomass, and the like by blowing hot air or oxygen at about 1,000 ° C. or more.
  • the ash component contained in coal is produced by directly injecting pulverized coal by burning the carbon-containing material outside the molten furnace, that is, the blast furnace, the Finex melt gasification furnace, and the outside of the furnace such as the Korex melting gasifier.
  • the carbon-containing material outside the molten furnace that is, the blast furnace, the Finex melt gasification furnace, and the outside of the furnace such as the Korex melting gasifier.
  • Al 2 O 3 , SiO 2, etc. can also solve the technical problem for blowing low-grade fuel containing a lot of ash components without entering the furnace.
  • the molten iron furnace is characterized in that any one of the blast furnace 50, Finex melt gasifier 60, Corex melt gasifier (70).
  • the molten iron is charged with coke, sintered ore, and then blows hot air to produce molten iron, and the process for manufacturing molten iron using a multi-stage flow reduction furnace 65 and a melt gasification furnace 60.
  • FINEX ® may be a process used in the melter-gasifier of korekseu using the smelting reduction by (melter-gasifier), as in 75 and the melter-gasifier shaft 70 of the process.
  • the hydrogen (H 2 ) content of the reducing gas is characterized in that less than 30%.
  • the hydrogen content of the reducing gas used in the steelmaking industry is preferably maintained at 30% or less.
  • the pressure of the gasifier 20 is characterized in that less than 5 bar 20 bar.
  • the pressure in the bottom of the blast furnace 50 is usually 4 atm or more and the pressure in the bottom of the Finex melt reduction furnace is usually 5 atm or more. Therefore, the pressure of the gasifier 20 is preferably maintained at 5 bar (bar) or more, and when the pressure exceeds 20 atm, it is not preferable due to the safety problems and excessive equipment cost of the gasifier (20).
  • the temperature of the reducing gas produced in the gasifier 20 is characterized in that 1,000 °C or more.
  • the reducing gas preferably contains carbon monoxide, hydrogen, or the like, by decomposing hydrocarbon compounds such as methane, and is preferably maintained at 1,000 ° C. or higher, which is equal to or higher than the decomposition temperature of methane.
  • the ash component contained in the pulverized coal does not flow into the molten iron furnace, about 10-20% of the alumina component introduced by the pulverized coal in the slag and about 20-30% of the silica component are molten iron. It can block the inflow into the furnace.
  • the present blast furnace operation is using a lot of semi-anthracite coal when blowing coal dust in consideration of constraints and calorific value such as ash component of pulverized coal, according to the present invention, because the reducing gas is injected into the blast furnace not cheap coal ash component.
  • This high lignite, coal briquettes, or anthracite series produced domestically, even biomass and RDF / RPF can be used.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

L'invention concerne un appareil de fabrication de fer fondu et un procédé de fabrication de fer fondu. L'appareil de fabrication de fer fondu selon la présente invention comprend : un dispositif de séchage qui sèche un matériau contenant du carbone en utilisant des gaz d'échappement déchargés dans le procédé de fabrication d'acier ; un four de gazéification qui charge le matériau séché contenant du carbone à travers un conduit relié au dispositif de séchage et produit ensuite un gaz de réduction par combustion du matériau contenant du carbone en utilisant un vent chaud à haute température ou de l'oxygène ; et un four de fer fondu qui est relié au four de gazéification par le conduit et fabrique du fer fondu par chargement du minerai de fer ou réduction de fer dans le four et amenée du gaz de réduction à travers un injecteur.
PCT/KR2012/008251 2011-12-22 2012-10-11 Appareil de fabrication de fer fondu et procédé de fabrication de fer fondu Ceased WO2013094864A1 (fr)

Priority Applications (1)

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CN201280063743.2A CN104024442B (zh) 2011-12-22 2012-10-11 铁水制造设备及铁水制造方法

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KR1020110140624A KR101322903B1 (ko) 2011-12-22 2011-12-22 용철제조장치 및 용철제조방법
KR10-2011-0140624 2011-12-22

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CN114250329A (zh) * 2020-09-25 2022-03-29 宝山钢铁股份有限公司 一种回旋区外置的炼铁工艺
WO2024224927A1 (fr) * 2023-04-27 2024-10-31 Ｊｆｅスチール株式会社 Procédé de traitement d'une couche de remplissage logée dans un récipient cylindrique

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