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WO2006135984A1 - Production de fer - Google Patents

Production de fer Download PDF

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Publication number
WO2006135984A1
WO2006135984A1 PCT/AU2006/000887 AU2006000887W WO2006135984A1 WO 2006135984 A1 WO2006135984 A1 WO 2006135984A1 AU 2006000887 W AU2006000887 W AU 2006000887W WO 2006135984 A1 WO2006135984 A1 WO 2006135984A1
Authority
WO
WIPO (PCT)
Prior art keywords
iron
bed
process defined
smelting
forming 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/AU2006/000887
Other languages
English (en)
Inventor
Christopher Martin Hayman
Andrew George Connor
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.)
Technological Resources Pty Ltd
Original Assignee
Technological Resources Pty Ltd
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
Priority claimed from AU2005903364A external-priority patent/AU2005903364A0/en
Application filed by Technological Resources Pty Ltd filed Critical Technological Resources Pty Ltd
Priority to BRPI0611894-1A priority Critical patent/BRPI0611894B1/pt
Publication of WO2006135984A1 publication Critical patent/WO2006135984A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/14—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
    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/56—Manufacture of steel by other methods
    • C21C5/567—Manufacture of steel by other methods operating in a continuous way
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
    • C21B2100/22—Increasing the gas reduction potential of recycled exhaust gases by reforming
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
    • C21B2100/26—Increasing the gas reduction potential of recycled exhaust gases by adding additional fuel in recirculation pipes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
    • C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
    • C21B2100/64—Controlling the physical properties of the gas, e.g. pressure or temperature
    • 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 iron-making process and an iron-making plant.
  • the present invention relates particularly, although by no means exclusively, to an iron-making process that includes a direct reduction step of reducing the iron-containing feed material and forming a reduced iron material by passing a reducing gas upwardly through a bed of the feed material .
  • reducing is understood herein to mean removal of some or all of the oxygen in the iron- containing material while the material is in a solid state.
  • reduced iron material is understood herein to include products that have at least 80% by weight iron .
  • iron when discussing the end product extends to products generally described as direct reduced iron (“DRI”) .
  • DRI direct reduced iron
  • the present invention relates more particularly, although by no means exclusively, to an iron-making process that includes the above-described bed-based direct reduction step that is characterized in that it is capable of processing iron ore that would generally be considered to be unsuitable (at least on its own) for forming a bed with acceptable gas flow characteristics .
  • Corumba ore is lump ore from the Corumba deposit in Brazil.
  • Corumba ore comprises tabular lump that can tend to form packed beds that does not readily permit uniform upward flow of reducing gas across the width of the bed. The gas flow tends to be channeled, with the result that there is poor contact between the reducing gas and a substantial part of the iron ore in the bed, leading to poor reduction of the material .
  • the iron making process of the present invention includes a direct reduction step that uses a bed forming material that facilitates forming a bed of an iron- containing material, such as tabular lump ore, in a shaft furnace or other suitable furnace so that there is optimum upward flow of the reducing gas through the bed.
  • the process also includes separating the reduced iron material produced in the furnace and the bed forming material . As a consequence, the bed forming material may be re-used in the direct reduction step.
  • the separated reduced iron material may be further processed at the same plant or transported to another plant for processing, as required.
  • the process may include a further step of smelting the reduced iron material and forming molten iron .
  • the smelting step may be carried out at the same plant as the direct reduction plant or at a separate plant.
  • the purpose of the bed forming material is to facilitate forming a bed of the iron-containing material in a shaft furnace or other suitable furnace so that there is optimum upward flow of the reducing gas through the bed.
  • optimum upward flow through the bed is upward flow that results in uniform contact between the reducing gas and at least a substantial amount of the iron-containing material in the bed so that there is substantially uniform reduction of iron-containing material throughout the bed.
  • bed forming material is particularly important in situations where the shape of the iron-containing material tends to form closely packed beds that have poor gas flow characteristics , with the result that there is poor reduction of material in a significant proportion of the bed.
  • tabular lump iron ore may be one such iron-containing material in this category.
  • the amount and the physical characteristics of the bed forming material required in any given situation will depend at least in part on the physical characteristics , such as size and/or shape , of the iron- containing material .
  • the bed forming material has a different size and/or a different shape to the iron-containing material , such as being in the form of spherical balls , which ensures that the bed does not closely pack and prevent uniform optimum upward flow of the reducing gas through the bed.
  • the separation step (b) is a further factor in the selection of the physical characteristics of the bed forming material .
  • the separation step includes separation that is based on size and/or shape, such as in a trommel screen assembly
  • these characteristics will need to be taken into account when selecting the size and/or shape of the bed forming material .
  • the bed forming material is material that is at least substantially non-reactive with the iron- containing material in that the material does not cause contamination of the reduced iron material that has an impact in downstream processing of the reduced iron material produced in step (b) , such as in a smelting step.
  • the bed forming material is a nonreducible material in the conditions in reduction step (a).
  • the bed forming material is at least substantially resistant to heat and abrasion and thereby maintains structural integrity in the operating conditions of reduction step (a) and separation step (b) .
  • the bed forming material may be a steel or a ceramic .
  • the bed forming material is spherical in shape .
  • the iron-containing feed material may include materials such as iron ore, partly reduced iron ore and iron-containing waste streams (for example, from steelmaking plants) .
  • the iron-containing feed material is substantially iron ore.
  • the iron ore is in the form of lump iron ore .
  • the lump iron ore includes tabular lumps .
  • the process includes re-using separated bed forming material in reduction step (a) .
  • the process includes continuously or periodically supplying the iron-containing feed material and the bed forming material to an upper end of a shaft furnace or another suitable furnace and continuously or periodically discharging reduced iron material and bed forming material from a lower end of the furnace, thereby operating the reduction step (a) as a downwardly moving bed of material in the furnace .
  • the process includes mixing the iron- containing material and the bed forming material prior to supplying the mixed material to the upper end of the shaft furnace or another suitable furnace .
  • the process includes crushing the reduced iron material from separation step (b) to a required particle size before supplying the material to a direct smelting vessel for smelting in the smelting step.
  • reduction step (a) produces reduced iron material having a metallisation of at least 80% .
  • reduction step (a) produces reduced iron material having a metallisation of no more than 90% .
  • reduction step (a) is a Midrex process, as described herein.
  • smelting step is a molten bath-based direct smelting process .
  • the molten bath-based direct smelting process includes supplying solid feed materials in the form of the reduced iron material from separation step (b) and solid carbonaceous material to a bath of molten iron and molten slag in a direct smelting vessel and supplying oxygen-containing gas into a space above the molten bath and smelting the reduced iron material and producing molten iron in the molten bath.
  • the oxygen-containing gas may be oxygen, air, or oxygen-enriched air.
  • the direct smelting process includes supplying solid feed materials to the molten bath by injecting solid feed materials and a carrier gas via one or more than one solids injection lance extending into the vessel .
  • the carrier gas may be any suitable gas .
  • the direct smelting process is a HIsmelt process, as described herein.
  • the HIsmelt process includes injecting solid feed materials in the form of the reduced iron material from separation step (b) and solid carbonaceous material and flux into a molten bath in a direct smelting vessel through a number of lances/tuyeres that are inclined to the vertical so as to extend downwardly and inwardly through a side wall of the vessel and into a lower region of the vessel so as to deliver at least part of the solid feed materials into a metal layer in the bottom of the vessel .
  • the HIsmelt process includes injecting an oxygen-containing gas into an upper region of the vessel through a downwardly extending lance to promote the post-combustion of reaction gases in the upper region of the vessel process.
  • the HIsmelt process includes discharging off-gas resulting from the post-combustion of reaction gases in the vessel through an off-gas duct in the upper part of the vessel.
  • melting is herein understood to mean thermal processing wherein chemical reactions that reduce iron oxides take place to produce molten iron.
  • a plant for producing iron from an iron- containing material that includes :
  • the iron making plant includes a plant for smelting the reduced iron material and forming molten iron.
  • the reduction plant (a) is a Midrex Direct Reduction plant.
  • separation apparatus (b) is a trommel screen assembly.
  • the smelting plant is a HIsmelt plant.
  • the plant further includes an apparatus for crushing reduced iron material from separation apparatus (b) as required for feed material to the smelting plant.
  • Figure 1 is a flowsheet of a Midrex Direct Reduction process
  • Figure 2 is a transverse cross-section of a trommel screen for separating solid material produced in the Midrex Direct Reduction process shown in the flowsheet of Figure 1 ;
  • Figure 3 is a diagram that illustrates one embodiment of a HTsmelt vessel for carrying out the HIsmelt process.
  • One, although not the only, embodiment of an iron-making process that produces molten iron from iron- containing feed material in the form of lump iron ore in accordance with the present invention includes the steps of:
  • the Midrex Direct Reduction process is based upon a shaft furnace 31 containing a downwardly moving bed of solid material and an upwardly moving counter-current flow of a reducing gas .
  • the reducing gas which includes from 10-20% CO and 80-90% H 2 , is produced from natural gas using a Midrex CO 2 reforming process and a proprietary catalyst.
  • the present invention is characterised by using a bed forming material that facilitates forming a bed of the lump ore and the bed forming material in the furnace 31 (or other suitable furnace) that enables optimum contact between the upwardly flowing reducing gas and the lump ore in the bed.
  • the bed forming material is selected to be spherical steel balls of 12.5 mm.
  • the selected proportions of the lump ore and the bed forming material are mixed together and thereafter supplied to a feed hopper 37 on top of the furnace 31 and thereafter are supplied as required as feed material to the furnace 31 via a proportioning hopper 38 that evenly distributes the solids into the furnace 31.
  • the furnace 31 operates at a low pressure of less than 1 bar gauge.
  • the feed material in the furnace 31 is first heated and thereafter reduced by upward flowing counter-current reducing gas that is injected through tuyeres 39 located in a bustle distributor at the bottom of a cylindrical section of the furnace 31.
  • the lump ore is reduced to a metallization of at least 80% by the time it reaches the bustle area.
  • the feed material goes through a transition zone and then reaches a lower conical section 41 of the furnace 31.
  • Lower carbon reduced iron ( ⁇ 1.5%C) is cooled using a circulating stream of cooled exhaust gas that is introduced in the conical section for cold DRI discharge .
  • Higher carbon DRI (up to 4.0%C) can be produced by introduction of natural gas into this cooling gas. It readily reacts (and cracks) with the highly reactive metallic DRI .
  • the Midrex gas generation system includes a CO2 reformer 33 that uses a Midrex catalyst.
  • the feed to the reformer is a mixture of process gas recycled from the furnace 31 and makeup natural gas .
  • the top gas leaves the furnace 31 at a temperature of 400 to 450 0 C and is cooled and dust is removed in a top gas scrubber 35. About two- thirds of the gas is recycled back to the process (process gas) and the rest is used as a fuel.
  • the process gas is compressed, mixed with natural gas and is preheated in a reformer recuperator before entering the tubes of the reformer 33.
  • the reformed gas comprising CO and H 2 , exits the reformer 33 at about 850 0 C and passes through collection headers to a reformed gas line .
  • the ratio of H 2 to CO is controlled at about 1.5 to 1.8.
  • reduced ore and bed forming material discharged from the Midrex shaft furnace 31 are supplied to a trommel screen assembly shown in Figure 2 and are separated into separate streams of reduced ore and bed forming material .
  • the trommel screen assembly is a generally cylindrical assembly and is inclined to the horizontal and is arranged to rotate about a central longitudinal axis "X" of the assembly in the direction of the arrow shown in Figure 2.
  • the higher end of the assembly is a supply end for feed material and the lower end of the assembly is a discharge end for separated streams of material .
  • the assembly includes an outer cylindrical shell 61 that retains material in the assembly.
  • the assembly also includes a series of concentric screens 63, 65, 71, each of which has a pre-selected mesh size marked on Figure 2.
  • the assembly also includes a series of baffles 69 extending inwardly from the innermost screen 71 to facilitate distribution of material as it moves down the screen .
  • reduced ore or bed forming material from the Midrex plant is supplied as a feed material via the supply end of the assembly to the central cylindrical passage defined by the innermost screen 69.
  • Rotation of the assembly about the longitudinal axis moves the material progressively down the passage.
  • the +13 mm material remains in the central passage and is discharged via the discharge end of the assembly.
  • This material is predominately reduced ore.
  • the -13 mm material passes outwardly through the screen 71 into an annular passage defined by the screens 65, 71.
  • the screen 65 allows -12mm material to pass outwardly through the screen and retains +12mm material in the passage .
  • This material is predominately the bed forming material .
  • the material is discharged via the discharge end of the assembly.
  • the -12mm material passes outwardly through the screen 65 into an outer annular passage way defined by the screens 63 , 65.
  • the outer screen 63 retains +6mm material in the passage.
  • the +6mm material is predominately reduced ore.
  • the material is discharged from the assembly via the discharge end of the assembly.
  • the -6mm material passes outwardly through the screen 63 into an outermost passage defined by the shell 61 and the screen 63.
  • the -6mm material in the passage way is predominately reduced ore .
  • the material is discharged from the assembly via the discharge end of the assembly.
  • the bed forming material discharged from the trommel assembly is re-cycled to the Midrex Direct Reduction process .
  • the +6 mm and +13mm reduced ore in the separate streams discharged from the trommel assembly is crushed to form -6 mm particle size distribution for the HIsineIt process .
  • the crushed material and the -6 mm reduced ore discharged from the trommel assembly are mixed together and are supplied as reduced ore fines to the HIsmelt plant.
  • the reduced ore, solid carbonaceous material in the form of coal, flux (lime and dolomite) , and hot air are supplied to a vessel 3 of a HIsmelt direct smelting plant and the reduced ore is smelted to molten iron using the HIsmelt process.
  • the HIsmelt process is as described in International application PCT/AU96/00197
  • the HIsmelt plant is as described in Australian provisional application 2005902022
  • the vessel 3 is described in detail in International applications PCT/AU2004/000472 and PCT/AU2004/000473, all in the name of the applicant.
  • the disclosure in the patent specifications lodged with these patent applications is incorporated herein by cross- reference .
  • the vessel 3 has a hearth in a lower section of the vessel that includes a base 81 and side walls 83 formed from refractory bricks/ side walls 85 which form a generally cylindrical barrel extending upwardly from the sides of the hearth and include an upper barrel section and a lower barrel section, a roof 87 that includes a central off-gas chamber 89, an off-gas duct 9 extending from the off-gas chamber 89, a forehearth 67 for discharging molten iron continuously from the vessel 3, and a tap hole (not shown in the Figure) for discharging molten slag periodically from the vessel 3.
  • the vessel 3 is fitted with a downwardly extending water-cooled hot air blast (“HAB”) lance 7 extending into a top space of the vessel 3 and eight water-cooled solids injection lances 5 extending downwardly and inwardly through the side wall 85 to deliver solid materials into the hearth.
  • HAB water-cooled hot air blast
  • the vessel 3 contains a molten iron bath.
  • one set of lances 5 is used for injecting reduced ore and flux and another set of lances 5 is used for injecting coal and flux.
  • Reduced ore may be pretreated by being preheated to a temperature in the range of 600-700 0 C and prereduced in a fluidised bed preheater (not shown) before being injected into the bath.
  • Coal and fluxes are stored in a series of lock hoppers (not shown) before being injected at ambient temperatures into the bath.
  • the coal is supplied to the lock hoppers via a coal drying and milling plant (not shown) .
  • the injected coal de-volatilises in the bath, thereby liberating H 2 and CO. These gases act as reductants and sources of energy.
  • the carbon in the coal is rapidly dissolved in the bath.
  • the dissolved carbon and the solid carbon also act as reductants, producing CO as a product of reduction .
  • the injected reduced ore is smelted to molten iron in the bath and is discharged continuously via the forehearth 67.
  • Molten slag produced in the process is discharged periodically via the slag tap hole (not shown) .
  • the typical reduction reactions involved in smelting injected iron-containing feed material to molten iron that occur in the bath are endothermic .
  • the energy required to sustain the process and, more particularly these endothermic reactions, is provided by reacting CO and H 2 released from the bath with oxygen-enriched air injected at high temperatures, typically 1200 0 C, into the vessel 3 via the HAB lance 7.
  • the hot, oxygen-enriched air injected into the vessel 3 via the HAB lance 7 is generated in hot blast stoves (not shown) by passing a stream of oxygen-enriched air (nominally containing 30 to 35% by volume O 2 ) through the stoves and heating the air and thereafter transferring the hot oxygen-enriched air to the HAB lance 7 via a hot blast main (not shown) .
  • a stream of oxygen-enriched air nominally containing 30 to 35% by volume O 2
  • the present invention is not confined to smelting the material and, more particularly is not confined to smelting the material in the same plant.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture Of Iron (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Abstract

La présente invention a trait à un procédé et un appareil de fabrication de fer. Le procédé comprend une étape de réduction directe de passage d'un gaz réducteur à travers un lit de (a) un matériau contenant du fer, tel qu'un bloc de minerai tabulaire, et (b) un matériau formant lit qui facilite la formation du lit de sorte qu'il y ait un écoulement vers le haut optimal d'un gaz réducteur à travers le lit. Le procédé comprend également la séparation du matériau de fer réduit et du matériau formant lit. Le matériau formant lit peut être réutilisé dans l'étape de réduction directe.
PCT/AU2006/000887 2005-06-24 2006-06-23 Production de fer Ceased WO2006135984A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BRPI0611894-1A BRPI0611894B1 (pt) 2005-06-24 2006-06-23 Processo e usina para produzir ferro a partir de um material que contém ferro

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2005903364A AU2005903364A0 (en) 2005-06-24 Production of iron
AU2005903364 2005-06-24

Publications (1)

Publication Number Publication Date
WO2006135984A1 true WO2006135984A1 (fr) 2006-12-28

Family

ID=37570041

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2006/000887 Ceased WO2006135984A1 (fr) 2005-06-24 2006-06-23 Production de fer

Country Status (4)

Country Link
AR (1) AR054517A1 (fr)
BR (1) BRPI0611894B1 (fr)
JO (1) JO2491B1 (fr)
WO (1) WO2006135984A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011012452A1 (fr) 2009-07-31 2011-02-03 Siemens Vai Metals Technologies Gmbh Procédé de réduction à base d’un gaz reformé avec production réduite de nox
WO2011012448A1 (fr) 2009-07-31 2011-02-03 Siemens Vai Metals Technologies Gmbh Procédé de réduction faisant appel à un gaz reformé avec recyclage des effluents gazeux issus de la réduction et décarbonisation de la partie des effluents gazeux utilisée comme gaz de combustion pour le reformeur
JP2013501140A (ja) * 2009-07-31 2013-01-10 エイチワイエル テクノロジーズ、エス．エー． デ シー．ヴイ Ｃｏ２の排出を規制した直接還元鉄の製造方法
EP4159879A4 (fr) * 2020-05-28 2023-12-06 Nippon Steel Corporation Procédé de production de fer réduit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023963A (en) * 1974-05-10 1977-05-17 Creusot-Loire Entreprises Process for the direct reduction of minerals on a continuous grate
GB1522929A (en) * 1976-06-24 1978-08-31 Krupp Gmbh Shaft furnace for direct reduction of iron ores
US4251267A (en) * 1979-08-24 1981-02-17 Midrex Corporation Method for direct reduction of metal oxide to a hot metallized product in solid form
US4389247A (en) * 1982-03-29 1983-06-21 Standard Oil Company (Indiana) Metal recovery process

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023963A (en) * 1974-05-10 1977-05-17 Creusot-Loire Entreprises Process for the direct reduction of minerals on a continuous grate
GB1522929A (en) * 1976-06-24 1978-08-31 Krupp Gmbh Shaft furnace for direct reduction of iron ores
US4251267A (en) * 1979-08-24 1981-02-17 Midrex Corporation Method for direct reduction of metal oxide to a hot metallized product in solid form
US4389247A (en) * 1982-03-29 1983-06-21 Standard Oil Company (Indiana) Metal recovery process

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011012452A1 (fr) 2009-07-31 2011-02-03 Siemens Vai Metals Technologies Gmbh Procédé de réduction à base d’un gaz reformé avec production réduite de nox
WO2011012448A1 (fr) 2009-07-31 2011-02-03 Siemens Vai Metals Technologies Gmbh Procédé de réduction faisant appel à un gaz reformé avec recyclage des effluents gazeux issus de la réduction et décarbonisation de la partie des effluents gazeux utilisée comme gaz de combustion pour le reformeur
CN102471810A (zh) * 2009-07-31 2012-05-23 西门子Vai金属科技有限责任公司 基于重整气体的还原方法，其中返回还原废气并对用作重整器的燃烧气体的废气组分脱碳
CN102471811A (zh) * 2009-07-31 2012-05-23 西门子Vai金属科技有限责任公司 基于转化炉气的具有降低的NOx排放的还原方法
JP2013501138A (ja) * 2009-07-31 2013-01-10 シーメンス・ファオアーイー・メタルズ・テクノロジーズ・ゲーエムベーハー 窒素酸化物排出の低減を伴う、改質器ガスに基づく還元方法
JP2013501140A (ja) * 2009-07-31 2013-01-10 エイチワイエル テクノロジーズ、エス．エー． デ シー．ヴイ Ｃｏ２の排出を規制した直接還元鉄の製造方法
RU2532202C2 (ru) * 2009-07-31 2014-10-27 Сименс Фаи Металз Текнолоджиз Гмбх Способ восстановления на основе риформинг-газа с рециркуляцией восстановительных газов и декарбонизацией части отходящего газа, использованного в качестве горючего газа для риформинг-установки
RU2532757C2 (ru) * 2009-07-31 2014-11-10 Сименс Фаи Металз Текнолоджиз Гмбх Способ восстановления на основе риформинг-газа с пониженными выбросами nox
US9169535B2 (en) 2009-07-31 2015-10-27 Siemens Vai Metals Technologies Gmbh Reformer-gas-based reduction process with decarbonization of the fuel gas for the reformer
US9181595B2 (en) 2009-07-31 2015-11-10 Siemens Vai Metals Technologies Gmbh Reformer gas-based reducing method with reduced NOx emission
CN105567898A (zh) * 2009-07-31 2016-05-11 首要金属科技奥地利有限责任公司 基于重整气体的还原方法，其中返回还原废气并对用作重整器的燃烧气体的废气组分脱碳
KR101679288B1 (ko) 2009-07-31 2016-11-24 프리메탈스 테크놀로지스 오스트리아 게엠베하 ＮＯｘ 방출을 감소시키는 개질 가스-기반 환원 방법
KR101679179B1 (ko) 2009-07-31 2016-11-24 프리메탈스 테크놀로지스 오스트리아 게엠베하 개질기용 연소 가스로서 이용되는 폐 가스 성분의 탈탄소화 및 폐 환원 가스의 회수를 이용한 개질된 가스-기반의 환원 방법
US9797026B2 (en) 2009-07-31 2017-10-24 Primetals Technologies Austria GmbH Reformer-gas-based reduction process with decarbonization of the fuel gas for the reformer
US10030911B2 (en) 2009-07-31 2018-07-24 Primetals Technologies Austria GmbH Reformer gas-based reducing method with reduced NOx emission
EP4159879A4 (fr) * 2020-05-28 2023-12-06 Nippon Steel Corporation Procédé de production de fer réduit

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AR054517A1 (es) 2007-06-27

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