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WO2025219324A1 - Procédé de production de fer de réduction directe comprenant du carbone intégré - Google Patents

Procédé de production de fer de réduction directe comprenant du carbone intégré

Info

Publication number
WO2025219324A1
WO2025219324A1 PCT/EP2025/060221 EP2025060221W WO2025219324A1 WO 2025219324 A1 WO2025219324 A1 WO 2025219324A1 EP 2025060221 W EP2025060221 W EP 2025060221W WO 2025219324 A1 WO2025219324 A1 WO 2025219324A1
Authority
WO
WIPO (PCT)
Prior art keywords
core
pellet
iron
hydrogen
direct
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/EP2025/060221
Other languages
English (en)
Inventor
Andrew FIRTH
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.)
Tata Steel Nederland Technology BV
Original Assignee
Tata Steel Nederland Technology BV
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 Tata Steel Nederland Technology BV filed Critical Tata Steel Nederland Technology BV
Publication of WO2025219324A1 publication Critical patent/WO2025219324A1/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
    • C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/2406—Binding; Briquetting ; Granulating pelletizing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/2413—Binding; Briquetting ; Granulating enduration of pellets
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic
    • C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/02—Working-up flue dust
    • 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 invention relates to a method for producing direct reduced iron comprising embedded carbon by reducing iron oxide and/or iron ore in a direct reduction plant.
  • the invention also relates a method for producing an indurated pellet for the direct reduced iron production method.
  • Direct reduced iron is produced from the direct reduction of iron ore conglomerates (mainly hematite, Fe 2 O 3 ) in the form of lumps, pellets, or fines into iron by a reducing gas.
  • Direct reduction refers to a solid-state process which reduce iron oxides to metallic iron at temperatures below the melting point of iron.
  • DRI direct reduced iron
  • a known process relates to a direct reduction plant (DRP) or DRI reactor comprising a direct reduction shaft furnace having a reduction zone and a lower discharge zone from which direct reduced iron (DRI) in solid form is discharged at a regulated rate by means of a suitable discharge mechanism.
  • the required carbon content cannot be supplied through the reducing gas in case the reducing gas is 100% hydrogen gas.
  • the iron ore pellets typically supplied to the DRP do not contain carbon as the carbon added to the iron ore pellet mixture is combusted during the induration step of the producing method of the iron ore pellets.
  • the DRI in solid form is further processed on exit from the discharge zone, and optionally also after being compacted into briquettes, in a melt shop typically comprising one or more electric-arc furnaces (EAF) or submerged-arc furnaces (SAF; in the art also known as a reducing electrical furnace or REF) or an open slag bath furnace (OSBF).
  • EAF electric-arc furnaces
  • SAF submerged-arc furnaces
  • OSBF open slag bath furnace
  • the melt shop typically further comprises ladle furnaces for metallurgical processing like alloying and refining to produce molten steel or other molten iron containing products.
  • the molten steel or other molten iron containing products are subsequently cast into slabs or coils which are ready for rolling and further heat treatment.
  • the resulting molten iron from the EAF/OSBF /SAF in the melt shop contains almost no carbon. This leads to more energy being required for melting the DRI. On the other hand, iron and carbon form a low melting eutectic, and thus significantly reduce the temperature needed to completely melt the DRI.
  • the carbon content in the DRI can be adjusted for its further processing in the melting furnace in a wide range from about 1 .5-4% by injecting a carburizing gas from a suitable source, which may be a hydrocarbon gas, coke oven gas, natural gas, syngas from biomass, or mixtures thereof, or other methane-containing and/or CO-containing syngas or any other carbon-containing gas that may deposit carbon in the DRI.
  • a carburizing gas from a suitable source, which may be a hydrocarbon gas, coke oven gas, natural gas, syngas from biomass, or mixtures thereof, or other methane-containing and/or CO-containing syngas or any other carbon-containing gas that may deposit carbon in the DRI.
  • a suitable source which may be a hydrocarbon gas, coke oven gas, natural gas, syngas from biomass, or mixtures thereof, or other methane-containing and/or CO-containing syngas or any other carbon-containing gas that may deposit carbon in the DRI.
  • the invention provides an additional improvement, an additional advantage, or an alternative to the prior art.
  • an indurated pellet comprising a core and a shell covering the core wherein the core consists of a carbonaceous material and the shell comprises iron ore and/or iron oxide.
  • One or more of the objectives of the invention are realized by providing a method for producing direct reduced iron in a direct reduction plant comprising the steps of
  • indurated pellets having a core and a shell covering the core to a direct reduction plant wherein the core consists of a carbonaceous material and the shell comprises iron ore and/or iron oxide
  • the carbonaceous material present in the core of the pellet can be retained without reaction or at least with limited reaction thanks to the layered structure of the indurated pellet.
  • a molten layer is formed between the core and the shell.
  • the partial combustion of the carbonaceous material with carbon dioxide in the core creates a substantial amount of carbon monoxide according to the Boudouard’s equilibrium below.
  • the carbon monoxide promotes the formation of higher amounts of molten calcium iron silicate slag in a thin layer around the core. This molten layer closes the pores of the pellets and minimises the access of the oxidising gases to the core. Therefore, the further reaction of the carbonaceous material of the core is substantially prevented during the induration process part of the pellet production. Moreover, as process temperature during direct reduction stays below the melting temperatures of the slag phase, the contact between the reducing gas and carbonaceous material of the core is also mostly prevented during the production of direct reduced iron in a direct reduction plant due to the closed pores of the indurated pellets. The carbonaceous material in the core is not released into the metal until the DRI is melted in the SAF, REF, OSBF, or EAF.
  • the direct reduced iron contains sufficient carbon for use in the EAF or REF or SAF or OSBF without a need for additional carburization of DRI or at least with limited additional carburization of DRI.
  • the additional carburization into the molten iron for subsequent steelmaking is incredibly challenging and inefficient due to the significant different densities of carbonaceous materials and the molten iron and slag.
  • the added carbon floats on the molten iron due to the density difference, the dissolution of the carbon is significantly slow.
  • the indurated pellets having a core allow for better dissolution of the carbon into the molten iron by ensuring more intimate contact between the iron and carbon of the core.
  • the direct reduction plant is a rotary hearth furnace (RHF).
  • the direct reduction plant (DRP) is of the gravitational type, more in particular it is a shaft furnace.
  • the DRP is of the gravitational type and comprises a reduction zone, inside which the iron ore reduction processes occur, feeding means to feed pellets to the reduction zone of said plant, a reducing gas circuit being provided with injection means configured to feed the reducing gas into the reduction plant, a reducing gas heater, an aperture to extract spent reducing gas, and a discharge zone to discharge the directly reduced iron, which is in solid form.
  • the DRI is charged into an electric furnace (SAF, REF, OSBF or EAF), preferably through a hot-connect between the DRP plant and the electric furnace.
  • SAF electric furnace
  • REF REF
  • OSBF OSBF
  • EAF electric furnace
  • the carbonaceous material is selected from the group: coke, graphite, carbon black, coal, charcoal, biomass, or biochar.
  • Coal may be any grade of coal, including lignite, sub-bituminous coal, bituminous coal, steam coal, or anthracite.
  • the amount of carbon contained in the carbonaceous materials is preferably about 50 wt.% or more, more preferably of at least 60 wt.%; the higher the better.
  • the carbonaceous material is selected from the group consisting of anthracite, coke breeze, compressed charcoal, or a combination thereof.
  • These carbonaceous materials contain high amount of carbon content and low porosity, so the volume of the core required for storing sufficient amount of carbon to be needed for the subsequent steelmaking can be reduced. More preferably, the carbonaceous material is compressed charcoal because it is a renewable resource.
  • the core has an average diameter of about 3 to 7 mm, preferably of about 4 to 6 mm. More preferably, the core has an average diameter of about 5 mm.
  • the metallised pellet contains enough carbon content to fulfill the need of the subsequent steelmaking process.
  • the DRI has a carbon content in a range of 1 .0 wt.% to 6.0 wt.%, and preferably in the range of about 3 wt.% to 5 wt.%, more preferably in the range of about 3.5 wt.% to 5.0 wt.%, and most preferably the carbon content in the DRI is about 4.0 wt.%.
  • the diameter of the cores needs to be limited.
  • the pellet has an average diameter of about 8 to 20 mm, preferably of about 8 to 18 mm, more preferably of about 10 to 16 mm. Most preferably, the pellet has an average diameter of about 12 mm.
  • balanced iron-carbon weight ratio can be obtained.
  • the shell ensures that the carbon is retained in the core of the pellet until the shell of the pellet is melted in the SAF, REF, OSBF or EAF.
  • indicated diameter ranges are the ranges before the induration of the pellets.
  • the iron ore is selected from the group consisting of hematite, magnetite, goethite, and mixtures thereof.
  • the iron content in the iron ore should be of about 50 wt.% or more, preferably of about 55 wt.% or more and more preferably of about 62 wt.% or more, the remainder is oxygen and gangue. A decrease in the iron content increases the required energy to melt the same amount of iron and therefore the cost.
  • the gangue is formed mainly by silicon oxide (silica), aluminium oxide (alumina), calcium oxide (lime), magnesium oxide, and other impurities in traces (e.g., sulphur, phosphorus, titanium oxide, manganese oxide, sodium oxide), and for the purpose of this invention gangue is considered to be an inert solid material which does not participate in the reduction reactions.
  • the shell of the pellet contains particulate of iron-oxide containing material formed by iron- or steelmaking reverts, such as for example, steelmaking sludge, rolling scales or blast furnace dust.
  • the shell contains a mixture of particulates of iron ore and particulates of iron-oxide containing material formed by iron- or steelmaking reverts such as for example, steelmaking sludge, rolling scales or blast furnace dust.
  • the circularity of the process can be obtained by using the iron- or steelmaking reverts.
  • the shell comprises a binder.
  • the binder holds the iron ore particulates in the shell together.
  • the binder can be an inorganic binder or an organic binder.
  • the shell can comprise a combination of inorganic and organic binders.
  • the inorganic binder may comprise one or more of clay or a salt thereof, lime, calcium aluminates cement, blast furnace cement, Portland cement, or pozzolanic binder.
  • the clay is bentonite or a salt thereof.
  • the binder is more preferably bentonite.
  • the shell comprises a fluxing agent.
  • the fluxing agent adjusts the basicity of the pellet. Moreover, it improves the reducibility, melting, porosity properties and sticking behaviour of the shell of the pellet.
  • the fluxing agent is any one of limestone (CaCCh), dolomite (CaMg(CC>3)2), olivine (Mg2SiO4), magnesite (MgCOa), colemanite (Ca2BeOir5H2O), wollastonite (CaSiOs) or combination thereof. Therefore, calcium and magnesium content of the slag can be controlled in an effective way.
  • the shell preferably comprises a binder or binders up to about 2 wt.%, a carbonaceous material up to about 2 wt.% and fluxing agent or agents up to about 5 wt.% with the remaining material being iron ore, iron oxide, iron oxide containing reverts or a combination thereof. More than 5% the fluxing agent content will significantly reduce iron content in the pellet and increase the slag content. Therefore, energy cost for melting the same amount of iron content will be increased.
  • the hydrogen-containing reducing gas is composed of at least 95 vol.% of hydrogen, preferably of at least 97 vol.% of hydrogen, more preferably of at least 99 vol.% of hydrogen.
  • the hydrogencontaining reducing gas is composed of 100 vol.% of hydrogen because the higher the hydrogen content the lower the CO2 footprint.
  • direct reduction of the iron ore and/or iron oxide realized at a temperature of 750°C or above.
  • one or more of the objectives of the invention are realized by a method for producing an indurated pellet for the above-mentioned direct reduced iron production method, comprising the steps of
  • Indurating the green pellet to obtain an indurated pellet wherein the maximum temperature of the pellet during induration is 1260°C, preferably 1250°C.
  • this molten layer minimises the further contact of the carbon of the core with oxidising gases in induration, and with reducing gases in the DRP. Therefore, the amount of the carbonaceous material kept in the core without reduction during the producing of DRI in the DRP can be increased. As a result, the carbonaceous material in the core is not released into the metal until the DRI is melted in the SAF, REF, OSBF or EAF. In addition, excessive melting in the pellets can occur at higher temperatures than 1260°C, and this would cause the exposure of the cores. Therefore, the temperature is dramatically increased and eventually it causes the pellets to fuse together and form a connected mass. It is prevented by controlling the maximum temperature of the pellet during induration.
  • the cores having predetermined size can be obtained only by screening the carbonaceous material.
  • the cores can also be formed by means of agglomeration in an agglomeration device. The agglomeration is realized by pelletising.
  • the cores can be formed by extrusion. Particularly, the carbonaceous material is extruded into short cylinders of predetermined size.
  • the cores having predetermined size can usually be obtained directly by agglomeration or extrusion. Nevertheless, after the agglomeration or extrusion, the cores are preferably screened to separate the unwanted smaller or larger pellets. The cores are screened by sieving.
  • the core has an average diameter of about 3 to 7 mm, preferably of about 4 to 6 mm. More preferably, the core has an average diameter of about 5 mm. In a possible embodiment of the invention, the green pellet has an average diameter of about 8 to 20 mm, preferably of about 8 to 18 mm, more preferably of about 10 to 16 mm. Most preferably, the green pellet has an average diameter of about 12 mm.
  • the green pellet having predetermined size are directly obtained by the agglomeration. Nevertheless, after the agglomeration, the green pellets are optionally screened to separate the unwanted smaller or larger pellets.
  • the green pellet is agglomerated by pelletising.
  • the core is wetted before the core and the pellet mixture come into contact during agglomeration.
  • the core is preferably wetted with water. The wetted core facilitates the layering of the pellet mixture on the surface of the core.
  • the core is agglomerated on a first balling device. Then the core is transferred to a second balling device. The core is added to a second balling device before the pellet mixture is added. The shell is agglomerated to cover the core on the second balling device.
  • the core and the shell can be agglomerated on the same balling device in two stages. In this case, the pellet mixture forming the shell is added to the balling device after the core is formed. Optionally, the core is wetted before adding it into the balling device.
  • the balling device is a balling drum or a balling disc.
  • temperature of the pellets during induration is kept between 1200°C and 1260°C, preferably between 1200°C and 1250°C. More preferably, temperature of the pellets during induration is kept between 1230°C and 1250°C. In a possible embodiment, temperature of the pellets during induration is kept between 1200°C and 1260°C, preferably between 1200°C and 1250°C for at least 2 minutes. More preferably, temperature of the pellets during induration is kept between 1230°C and 1250°C for at least 2 minutes.
  • the induration furnace preferably comprises interconnecting zones with different gas flow rates. These interconnecting zones are the zones where the pellets are dried, preheated, indurated, and cooled.
  • a bed of the green pellets is carried by a grate through the zones.
  • the bed height of the green pellets is arranged as a maximum of 20 cm in order to help keep the temperature of the pellets within the optimum temperature range.
  • One of the possible induration furnaces is a straight grate pellet induration furnace.
  • the pellet mixture comprises a binder.
  • the binder is an inorganic binder or an organic binder or a combination of inorganic and organic binders.
  • the binder is bentonite.
  • the pellet mixture comprises a fluxing agent.
  • the fluxing agent is one of limestone (CaCOs), dolomite (CaMg(CO3)2), olivine (Mg2SiO4), magnesite (MgCOs), colemanite (Ca2BeOir5H2O), wollastonite (CaSiOs) or combination thereof.
  • the iron ore is selected from the group consisting of hematite, magnetite, goethite, and mixtures thereof.
  • the pellet mixture is obtained by mixing the iron ore, optionally iron oxide, water, at least one binder and at least one fluxing agent.
  • the carbonaceous material is any one of anthracite, coke breeze, charcoal, or a combination thereof.
  • the direct reduced iron comprises one or more of the features described with the possible embodiments of the methods above.
  • the DRI has a carbon content in a range of 1.0 wt.% to 6.0 wt.%, and preferably in the range of about 3 wt.% to 5 wt.%, more preferably in the range of about 3.5 wt.% to 5.0 wt.%, and most preferably the carbon content in the DRI is about 4.0 wt.%.
  • an indurated pellet produced by the above-mentioned indurated pellet production method comprising a core and a shell covering the core.
  • the core consists of a carbonaceous material and the shell comprises iron ore and/or iron oxide.
  • the indurated pellet is suitable for use in the above-mentioned direct reduced iron production.
  • the indurated pellet comprises one or more of the features described with the possible embodiments of the methods above.
  • the indurated pellet has a carbon content at least 1.5 wt.%, preferably at least 2.0 wt.% and more preferably at least 2.5 wt.%, most preferably at least 3.0 wt.%.
  • Pellets having a core consisting of carbonaceous material and a shell comprising iron ore were prepared within the scope of laboratory scale study.
  • the carbonaceous material was selected as coke breeze and the cores having average diameter of between 5 mm and 6.3 mm were obtained by sieving.
  • the pellet mixture for the shell contained iron ore as remainder, 8 wt.% water, 2.5 wt.% of limestone, 0.05 wt.% of olivine and 0.45 wt.% of bentonite.
  • the ore was wetted to 6% moisture in the mixer with the bentonite and limestone.
  • the basicity of the mixture is 0.85%.
  • the iron ore contained 85% magnetite and 15% hematite.
  • the cores consisting of coke breeze were placed in a rotating balling drum, and the iron ore mixed with water, bentonite, olivine and limestone was added slowly to a drum via a vibratory feeder.
  • the green balls having average diameter of between 10 mm and 13 mm were obtained.
  • the green balls were placed in a stainless-steel mesh basket placed into the pot-grate, surrounded by the alumina balls.
  • the pot, including the basket was then fired in an induration furnace.
  • the temperature of the pellets was measured by thermocouples disposed above and below the basket. The maximum temperature recorded at the thermocouple was 1230°C.
  • the temperature of the pellets was maintained between 1200°C and 1230°C for between 200 seconds and 250 seconds.
  • the carbonaceous material was retained in the core after the induration. After the induration, pellets were subsequently reduced in a pure hydrogen atmosphere at 900 °C for 8 hours. The carbonaceous material was also kept in the core after the reduction. 3.39 wt.% carbon was retained in the reduced pellets. Chemical analyses of indurated and reduced pellets are shown in detail in Table 1.

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

Abstract

L'invention concerne un procédé de production de fer de réduction directe comprenant du carbone intégré par réduction d'oxyde de fer et/ou de minerai de fer dans une installation de réduction directe. L'invention concerne également un procédé de production d'une pastille indurée pour le procédé de production de fer de réduction directe.
PCT/EP2025/060221 2024-04-17 2025-04-14 Procédé de production de fer de réduction directe comprenant du carbone intégré Pending WO2025219324A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP24170836 2024-04-17
EP24170836.1 2024-04-17

Publications (1)

Publication Number Publication Date
WO2025219324A1 true WO2025219324A1 (fr) 2025-10-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2025/060221 Pending WO2025219324A1 (fr) 2024-04-17 2025-04-14 Procédé de production de fer de réduction directe comprenant du carbone intégré

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WO (1) WO2025219324A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1160337A1 (fr) 2000-05-31 2001-12-05 DANIELI & C. OFFICINE MECCANICHE S.p.A. Procédé pour préchauffer et carburer du fer directement réduit avant de le transférer à un four à arc
EP3020834A1 (fr) * 2013-07-10 2016-05-18 JFE Steel Corporation Particules granulées contenant un matériau carboné pour la fabrication d'un minerai fritté, procédé pour leur production, et procédé de production d'un minerai fritté
WO2016170467A1 (fr) * 2015-04-24 2016-10-27 Sabic Global Technologies B.V. Boulettes de fer composites et procédés pour les fabriquer
US20210333048A1 (en) 2018-12-05 2021-10-28 Danieli & C. Officine Meccaniche S.P.A. Vessel for containing direct reduced iron
WO2022209014A1 (fr) * 2021-03-31 2022-10-06 Ｊｆｅスチール株式会社 Particules de matière première pour la production d'un agglomérat, procédé de production de particules de matière première pour la production d'un agglomérat, agglomérat, procédé de production d'un agglomérat et procédé de production de fer réduit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1160337A1 (fr) 2000-05-31 2001-12-05 DANIELI & C. OFFICINE MECCANICHE S.p.A. Procédé pour préchauffer et carburer du fer directement réduit avant de le transférer à un four à arc
EP3020834A1 (fr) * 2013-07-10 2016-05-18 JFE Steel Corporation Particules granulées contenant un matériau carboné pour la fabrication d'un minerai fritté, procédé pour leur production, et procédé de production d'un minerai fritté
WO2016170467A1 (fr) * 2015-04-24 2016-10-27 Sabic Global Technologies B.V. Boulettes de fer composites et procédés pour les fabriquer
US20210333048A1 (en) 2018-12-05 2021-10-28 Danieli & C. Officine Meccaniche S.P.A. Vessel for containing direct reduced iron
WO2022209014A1 (fr) * 2021-03-31 2022-10-06 Ｊｆｅスチール株式会社 Particules de matière première pour la production d'un agglomérat, procédé de production de particules de matière première pour la production d'un agglomérat, agglomérat, procédé de production d'un agglomérat et procédé de production de fer réduit

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