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WO2000036160A1 - Procede de production d'acier par reduction directe d'oxydes de fer et installations integrees - Google Patents

Procede de production d'acier par reduction directe d'oxydes de fer et installations integrees Download PDF

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Publication number
WO2000036160A1
WO2000036160A1 PCT/IB1999/001924 IB9901924W WO0036160A1 WO 2000036160 A1 WO2000036160 A1 WO 2000036160A1 IB 9901924 W IB9901924 W IB 9901924W WO 0036160 A1 WO0036160 A1 WO 0036160A1
Authority
WO
WIPO (PCT)
Prior art keywords
iron
furnace
plant
reducing gas
reduction furnace
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/IB1999/001924
Other languages
English (en)
Inventor
Gianpietro Benedetti
Milorad Pavlicevic
Alessandro Martinis
Matteo Vittorio Losciale
David Rabascall
Henry Rafael Bueno
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.)
Danieli and C Officine Meccaniche SpA
Original Assignee
Danieli and C Officine Meccaniche SpA
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 Danieli and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Priority to AU12911/00A priority Critical patent/AU1291100A/en
Publication of WO2000036160A1 publication Critical patent/WO2000036160A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • Y02P10/20—Recycling

Definitions

  • This invention concerns a process to produce steel starting from mineral iron, wherein the iron is present in the form of oxides, and the relative plant which comprises a reduction furnace with multiple inlets for the reducing gas and inside which the process of direct reduction of the iron 0 (DRI) is carried out.
  • the lower outlet of the reduction furnace is of the multiple type to facilitate the selective and simultaneous discharge of several types of product, either hot or cold, so that it may be subsequently stored, sent to a melting furnace, for example of the electric arc 5 type, to produce liquid steel, or converted into hot briquette iron (HBI) .
  • the exhaust gas from the reduction furnace is recircled and also used as fuel for the burners of the melting furnace or to heat the scrap in a pre-heating station.
  • the state of the art includes processes of direct reduction which use the injection of hydrocarbons into the current of reducing ' gas to allow the reaction of reforming the methane in the furnace with the H 2 O and CO 2 in the gas; 25 there are also known processes of direct reduction which use the injection of hydrocarbons with C>5 directly into the furnace in the zone between the injection of the reducing gas and the outlet from above of the burnt gas .
  • the state of the art also includes processes wherein the hot metallic iron is produced in a reduction furnace of the shaft type, with a vertical and gravitational flow of the material, which is subsequently sent to the melting furnace by means of a closed pneumatic transport system in an inert atmosphere .
  • the method to produce steel starting from metallic iron obtained by the direct reduction of iron oxides and the relative plant according to the invention are set forth and characterised in the respective main claims, while the dependent claims describe other innovative features of the invention.
  • the method according to the invention consists of an integrated process of direct reduction of the iron oxides and the melting of the hot reduced iron in a melting furnace optionally equipped with a scrap pre-heating station wherein part of the gases emerging from the reduction furnace are recircled to pre-heat iron scrap either directly in contact with the scrap after having effected the combustion of the residual CO and H 2 , or sent to burners as poor fuel or possibly enriched with gassy hydrocarbons, suitable to preheat the scrap.
  • the iron scrap constitutes all or part of the load of a melting furnace, for example an electric arc furnace, for the production of steel .
  • One purpose of this invention is to achieve a method and relative plant which will exploit the energies to the maximum to obtain the minimum consumption possible in the process of producing steel starting from mineral iron, with a direct reduction of the scrap in -a gravitational-type furnace .
  • the mineral iron of various granulometry, is brought into contact with a feed gas in a vertical furnace of the gravitational or shaft type, wherein both the gas and the material are fed continuously, so that there is a flow of material from the top to the bottom and the direct reduction of the mineral is achieved.
  • the material may be discharged from the reactor either cold or preferably hot to be sent subsequently to a melting furnace or so that it may be converted into hot briquette iron (HBI) or cooled and converted into direct reduction iron (DRI) .
  • the reduction furnace is equipped with means to feed the mineral iron and means to discharge the reduced metallic iron; it is equipped with at least one inlet collector, arranged laterally, to inject the reducing gas in correspondence with one or more reduction zones inside the furnace .
  • the reduction gas sent into the reactor contains hydrocarbons injected into the current after the partial combustion of the hydrogen and carbon monoxide with the oxygen .
  • the direct reduction of the iron oxides is achieved in one or more continuous stages inside the reduction reactor.
  • the inlet temperature of the two currents of reducing gas can be independently regulated by injecting O 2 before they enter the reduction reactor.
  • the flow of reducing gas can be regulated autonomously and independently, both in delivery and in composition, since there is an addition of oxygen to raise the temperature and generate a change in the level of oxidation of the gas, from normal values of 0.04-0.08 to 0.06-0.15.
  • the following ratio is intended for the level of oxidation of the reducing gas :
  • Nox (H 2 0+C0 2 ) / (H 2 0+C ⁇ 2 +H 2 +CO)
  • the method also provides to inject natural gas into the current of gas entering the furnace to compensate the greater oxidation of the gas and in such a manner as to cause the reduction reaction of the iron oxide with gassy hydrocarbons such as CH 4 and higher hydrocarbons in the inner zone of the reduction furnace containing metallic iron with the iron oxides .
  • the inlet temperature of the current of reducing gas can be independently regulated by injecting O 2 before it enters the reduction reactor with a final inlet temperature of more than 760°C preferably between 900°C and 1150°C.
  • the reducing gas enters the median zone of the furnace and acts in such a way as to cause the reduction reaction of the iron oxides to metallic iron.
  • the gas emerging from the reduction reactor is partly recircled and partly used as fuel.
  • the recircled gas has a latent heat of reaction which can be exploited to improve the melting times of the scrap and to increase the total steel productivity .
  • This energy can be modulated according to the production or processing requirements of the furnace so that the gas can be used to pre-heat the scrap in a variable quantity , modulating it also according to the energy requirements of the reformer.
  • the recircled gas, containing CO and H 2 is burnt in appropriate burners located in the scrap pre-heating station, preferably in a cover placed above the basket containing the scrap itself, so that the emerging gases, prevalently consisting of CO 2 and H 2 O, exchange energy through convection and radiance.
  • the final temperature of the scrap depends on the cycle time of the furnace and the stratification of the scrap as well as on the quantity of gases used, and is between 300°C and 1000°C.
  • the melting furnace can thus be fed continuously with hot metallic iron; at the same time the gases emerging from the furnace are mixed, either wholly or in part, with the gases emerging from the burners and are used for pre-heating the scrap.
  • the recircled gas .can be used as fuel for the burners of the melting furnace.
  • the fumes of the melting furnace can be used in cooperation with the reduction gases arriving from the reformer, in the pre-reduction zone of the reduction furnace, to pre-heat and pre-reduce the iron oxides .
  • the direct reduction of the iron oxides is achieved in two different contiguous stages inside the reduction reactor.
  • a first stage defined as the pre-heating and pre- reduction stage
  • the fresh iron oxides that is, those just introduced into the furnace
  • a mixture of reduction gas consisting of partly burnt gas, arriving from the underlying part of the furnace and of fresh hot gas, that is, gas introduced from outside, arriving from a collector which brings fresh reducing gas and possibly CH 4 or other natural gas.
  • This first stage takes place in a corresponding first zone arranged in the upper part of the furnace.
  • the complete reduction of the iron oxides is achieved, due to the action on the oxides, already partly reduced in the first stage, of a mixture of reducing gas based on H 2 and CO and at least a hydrocarbon, preferably natural gas, injected in the median zone of the reduction reactor.
  • This second stage takes place in a corresponding second zone arranged below the first zone.
  • the first inlet for the reducing gas is located at a set distance (x) with respect to the second inlet, which is located in the median part of the furnace, in correspondence with the second reduction zone.
  • This distance (x) is suitably between 1 and 6 meters, preferably between 2 and 4 metres, to encourage the reactions in the most suitable zone between the reducing gas and the iron oxides .
  • the first gas inlet also has the function of pushing the gases arriving from the second reduction zone towards the centre of the furnace so as to create a uniform distribution of the gas in the section of the reactor.
  • the lower outlet of the furnace is of the multiple type, to allow the simultaneous discharge of several types of product.
  • the multiple outlet encourages the distribution of the reduction gas inside the furnace and a better distribution of the material inside the furnace, preventing preferential channels which occur in furnaces with a single cone outlet.
  • the finer material tends to settle in the middle and this encourages the reducing gas to flow in the outer part, reducing the iron oxides nearer the wall more than in the middle; the reducing gas therefore has difficulty in penetrating the core of the solid bed of material, so that it is more difficult to reduce the iron oxides and in any case it takes longer .
  • the whole reaction zone of the furnace works with a more uniform and especially constant temperature along the whole section of the reduction furnace, encouraging a higher reaction speed, consequently reducing consumption and increasing productivity.
  • the reduced metallic iron is discharged preferably hot through the multiple outlet, preferably with 3 or 4 cones, which are enabled to discharge the material in a controlled manner, independent of each other.
  • the great advantage of being able to discharge simultaneously from several points is that it is possible to regulate the outlet delivery of material by varying the speed of removal of the individual discharge systems. Another advantage is that this movement helps to make the material descend from the upper zone in a uniform manner, with a perfect mixing of the larger particles with the finer particles, creating a continuous movement of the material and reducing the possibility of blockages of the material .
  • a further, considerable advantage is that it is possible to simultaneously discharge hot material which will then be used in various ways : one part may be introduced directly into a melting furnace, for final melting; a part may be made into briquettes; and a part may be cooled outside in a silo and sent for storage.
  • a further advantage is that it is possible in any case to discharge all the output hot material into the melting furnace to produce steel, greatly reducing energy consumption.
  • All the material may also be briquetted hot or cooled and stored.
  • Fig. 1 shows in diagram form a plant for the production of steel starting from mineral iron according to the invention
  • Fig. 2 is an enlarged detail of a variant of a reduction furnace employed in the plant shown in Fig . 1.
  • DETAILED DESCRIPTION OF PREFERRED EMBODIMENT With reference to Fig. 1, a plant for the production of steel according to the invention comprises a reduction furnace 10 of the vertical gravitational, or shaft type, inside which there is a reduction reactor.
  • the furnace 10 comprises in turn an upper mouth 11 for feeding from above, through which the mineral, consisting of iron oxides, is able to be introduced, a first pre-heating and pre-reduction zone 12, a second zone, or median zone 14 wherein the final reduction reaction of the iron oxides takes place, and a lower zone, or discharge zone 15.
  • the mineral consisting of iron oxides
  • the lower zone 15 consists of three ends, shaped like a cone or truncated cone tapering downwards 15a, 15b and 15c, each of which is provided with a lower aperture 16a, 16b and respectively 16c, through which, selectively, the directly reduced metallic iron (DRI) can be discharged in a controlled and independent manner.
  • DRI directly reduced metallic iron
  • the iron-based metal oxides are introduced into the reactor 10 in the form of pellets or crude mineral in the appropriate sizes; the iron contained therein is usually between 63% and 68% in weight.
  • the iron contained in the reduced material exiting from the reactor 10 is normally between 80% and 90% in weight.
  • the reactor 10 In correspondence with the two zones 12 and 14 of the reactor 10 there are two independent inlets 17, respectively 18, through which a mixture of gas is suitable to be introduced, as will be described in greater detail hereafter.
  • the reactor 10 In its upper part, above zone 12, the reactor 10 is provided with an aperture 19 through which the burnt gas exits.
  • the burnt gas emerging from the reactor 10 is sent through a pipe 20 to a cooling unit 21, suitable to recover the sensitive heat; from the cooling unit 21, through another pipe 22, it arrives at a cooling and condensing unit 24.
  • the burnt gas is washed in water at a temperature of between 40°C and 65°C and the quantity of water present in the gas itself is partly removed.
  • the percentage of water remaining in the gas at outlet from the unit 24 is between 2% and 7%.
  • the gas at outlet from the unit 24 is sent through a pipe 30 partly to a pre-heater 36, partly to a reformer 44, to be used as fuel, and partly to a compressor 26.
  • the gas emerging from the compressor 26 is in turn used partly as a recircled gas and sent, through a pipe 28, inside the unit 21, and partly, through a pipe 46, mixed with a natural gas, for example methane arriving from a pipe 34 in a proportion of about 4:1 (that is to say, for every part of natural gas there are about four parts of gas arriving from the pipe 46) and introduced into the reformer 44 so that the reforming reaction of the methane (CH 4 ) with H 2 O and CO 2 can begin.
  • a natural gas for example methane arriving from a pipe 34 in a proportion of about 4:1 (that is to say, for every part of natural gas there are about four parts of gas arriving from the pipe 46) and introduced into the reformer 44 so that the reforming reaction of the methane (CH 4 ) with H 2 O and CO 2 can begin.
  • the part of gas which is sent to the unit 21 through the pipe 28 is pre-heated, and is then sent through a pipe 32 to the pre-heater 36, where it is further pre-heated to a temperature of between 650°C and 950°C. CH 4 may also be injected into the pipe 32.
  • the gas emerging from the pre-heater 36 which has a delivery rate of between 600 Nm 3 /ton DRI and 1500 Nm 3 /ton DRI, is mixed in a pipe 38 with the gas arriving from the reformer 44 through a pipe 50.
  • the gas resulting from this mixture is divided into two parts and distributed into two pipes 40 and 41, connected to the inlets 17 and 18 of the furnace 10.
  • air is injected, or air enriched with oxygen or pure oxygen and natural gas in variable percentages .
  • the delivery of reducing gas is controlled in each zone 12, 14 by means of regulation valves 85 and 86.
  • a current of CH 4 or natural gas is injected into the gas before it is introduced into the reactor.
  • the CH 4 is injected before achieving the partial combustion, with the purpose of raising the temperature of the gas introduced into the reactor.
  • the CH 4 may also be introduced in a zone between the reduction zone 14 and the discharge cone of the material, through a pipe 81. In this case, before entering into the zone 14 where the reduction reactions are carried out, the CH 4 injected partially cools the reduced iron, before the latter is discharged.
  • Valves V1-V12 are located in correspondence with the different conduits of the plant so that the flow can be selectively controlled.
  • the resulting mixtures are introduced into the pre-heating and pre-reduction zone 12 and respectively into the reduction zone 14. Therefore, for each zone 12 and 14 the corresponding mixture of gas is regulated in an autonomous and independent manner, and according to the temperature of the reducing gas.
  • the flow of gas in the first zone 12 is between 500 Nm 3 /ton DRI and 800 Nm 3 /ton DRI and enters the reduction reactor 10 with a temperature of between 800°C and 1150°C, preferably between 1000°C and 1150°C
  • the flow of gas in the second zone 14 is between 1000 Nm 3 /ton DRI and 1500 Nm 3 /ton DRI and enters the reduction reactor 10 with a temperature of between 800°C and 1150°C, preferably between 1000°C and 1150°C.
  • the consumption of oxygen which is necessary to raise the temperature of the reducing gas from 650°C-950°C to 800°C-
  • 1150°C intended as pure oxygen plus that contained in the air, if air is also injected, is between 8 Nm 3 /ton DRI and 60 Nm 3 /ton DRI, preferably between 20 and 60 Nm 3 /ton DRI.
  • the consumption of CH 4 is between 50 and 120 Nm 3 /ton DRI, preferably between 90 and 110 Nm 3 /ton DRI.
  • the recircled gas which possesses a latent heat of reaction, is also exploited to improve the melting times of a station 60 to pre-heat iron scrap and increase the total steel productivity.
  • This energy can be modulated according to the production or processing requirements of the furnace, so that the gas can be used to pre-heat the scrap in a variable quantity, modulating it also according to the energy requirements of the reformer 44.
  • the pipe 46 is connected by means of valves 70 to the following elements: the burners 66 of the scrap pre-heating station 60, to which burners 66 a fuel and, respectively, air and oxygen also arrive through pipes 67 and 68; the burners 62 of the melting furnace 51; a mixer-heater 69, connected in turn with the scrap pre- heating station 60.
  • a fuel and, respectively, air and oxygen flow into the mixer-heater 69 through pipes 71 and 72.
  • the recircled gas, containing CO and H is burnt in burners 66 of the scrap pre-heating station 60, preferably in a cover 75 located above the basket containing the scrap, so that the emerging gases, prevalently consisting of CO 2 and H 2 O, exchange energy through convection and radiance.
  • the final temperature of the scrap depends on the cycle time of the furnace and the stratification of the scrap, as well as the quantity of gases used, and is between 300°C and 1000°C.
  • the directly reduced metallic iron (DRI) emerges hot from the furnace 10, at a temperature of between 600°C and 800°C and can follow either of the three ways 15a, 15b or 15c.
  • one part can be introduced directly into a melting furnace 51, such as an electric arc furnace, for final melting, provided with an outlet 63 from which the steel is removed; a part can be briquetted by a briquetting machine 52; and a part can be cooled outside in a silo 53 and sent for storage.
  • a melting furnace 51 such as an electric arc furnace
  • a part can be briquetted by a briquetting machine 52
  • a part can be cooled outside in a silo 53 and sent for storage.
  • the part emerging from the silo 53 can also be sent to the electric furnace 51.
  • the electric furnace 51 can thus be fed continuously with hot metallic iron.
  • the gases emerging from the furnace 51 are all mixed together or partly with the gases emerging from the burners 62 and, by means of a pipe 76, are used in the pre-heating of the scrap in the station 60.
  • the pipe 76 is also connected, by means of a pipe 61, to the pipe 40 which takes the reducing gas to the zone 12 of the reduction furnace 10.
  • a filter device 90 is inserted in the pipe 61 to separate and retain any possible powders included in the fumes .
  • the fumes from the melting furnace 51 in fact, have a high CO content, and can be used in cooperation with the reduction gases arriving from the reformer 44, in the pre- reduction zone 12 to pre-heat and pre-reduce the iron oxides .
  • each lower end 15a, 15b and 15c is provided with a rotary valve 47, 48 and respectively 49, suitable to regulate the flow of material emerging from the furnace 10.
  • each lower end 15a, 15b and 15c is provided with an inlet 55 through which a cooling element can be introduced; hence, from the outlets 16a, 16b and 16c hotter or cooler products can emerge or even already cooled enough to be stored immediately.
  • Each lower end 15a, 15b and 15c can also be provided with a device 56 to inject fuel gas to have different levels of carbon in the reduced iron at outlet, according to the use which will be made thereof .

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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)
  • Compounds Of Iron (AREA)

Abstract

Cette invention a trait à un procédé, et aux installations intégrées correspondantes, de production d'acier à partir de fer minéral, le fer se présentant sous forme d'oxydes. Le procédé comporte les étapes suivantes : alimentation en fer minéral d'un four de réduction vertical (10) du type à chargement par gravité, injection d'un mélange gazeux à haute température dans ce four de réduction (10), retrait du four (10) du fer de réduction directe (DRI) et fonte de ce fer de réduction directe (DRI) dans un four à fusion (51). Le fer de réduction directe (DRI) part alimenter directement le four à fusion (51) et l'on utilise une partie au moins des gaz du four de réduction (10) remis en circulation dans un poste de préchauffage (60) de ferraille ou comme combustible pour des brûleurs (62, 66). Il est égalementossible d'introduire introduit directement ces gaz dans le poste de préchauffage de ferraille (60).
PCT/IB1999/001924 1998-12-11 1999-12-02 Procede de production d'acier par reduction directe d'oxydes de fer et installations integrees Ceased WO2000036160A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU12911/00A AU1291100A (en) 1998-12-11 1999-12-02 Method and integrated plant for the production of steel by means of direct reduction or iron oxides

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD98A000215 1998-12-11
IT000215 IT1302814B1 (it) 1998-12-11 1998-12-11 Procedimento e relativo impianto integrato per la produzionedi acciaio mediante riduzione diretta di ossidi di ferro

Publications (1)

Publication Number Publication Date
WO2000036160A1 true WO2000036160A1 (fr) 2000-06-22

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Application Number Title Priority Date Filing Date
PCT/IB1999/001924 Ceased WO2000036160A1 (fr) 1998-12-11 1999-12-02 Procede de production d'acier par reduction directe d'oxydes de fer et installations integrees

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AR (1) AR021611A1 (fr)
AU (1) AU1291100A (fr)
IT (1) IT1302814B1 (fr)
WO (1) WO2000036160A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1573076A4 (fr) * 2002-12-21 2006-09-13 Posco Appareil de fabrication de fers fondus par compactage a chaud de fers fins de reduction directe et d'additifs calcines, et procede mettant en oeuvre cet appareil
CN113631728A (zh) * 2019-02-13 2021-11-09 丹尼尔和科菲森梅克尼齐有限公司 直接还原系统和相关工艺
EP4127250A4 (fr) * 2020-03-24 2024-05-29 Midrex Technologies, Inc. Intégration d'une installation de réduction directe et d'un four de fusion électrique de fer à réduction directe pour la production de fer haute performance
US12421564B2 (en) 2020-03-24 2025-09-23 Midrex Technologies, Inc. Iron (DRI) between a DRI source and processing equipment for the DRI

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4270739A (en) * 1979-10-22 1981-06-02 Midrex Corporation Apparatus for direct reduction of iron using high sulfur gas
US4725309A (en) * 1986-03-17 1988-02-16 Hylsa, S.A. Method and apparatus for producing hot direct reduced iron
US4826429A (en) * 1986-12-22 1989-05-02 Kennedy Van Saun Corporation Apparatus for uniformly cooling pyroprocessed particulate material
DE4041689A1 (de) * 1990-04-20 1991-10-24 Orinoco Siderurgica Verfahren und anlage zum herstellen von stahl aus eisenhaltigen metalloxiden

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4270739A (en) * 1979-10-22 1981-06-02 Midrex Corporation Apparatus for direct reduction of iron using high sulfur gas
US4725309A (en) * 1986-03-17 1988-02-16 Hylsa, S.A. Method and apparatus for producing hot direct reduced iron
US4826429A (en) * 1986-12-22 1989-05-02 Kennedy Van Saun Corporation Apparatus for uniformly cooling pyroprocessed particulate material
DE4041689A1 (de) * 1990-04-20 1991-10-24 Orinoco Siderurgica Verfahren und anlage zum herstellen von stahl aus eisenhaltigen metalloxiden

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1573076A4 (fr) * 2002-12-21 2006-09-13 Posco Appareil de fabrication de fers fondus par compactage a chaud de fers fins de reduction directe et d'additifs calcines, et procede mettant en oeuvre cet appareil
US7776136B2 (en) 2002-12-21 2010-08-17 Posco Apparatus for manufacturing molten irons by hot compacting fine direct reduced irons and calcined additives and method using the same
US7858019B2 (en) 2002-12-21 2010-12-28 Posco Apparatus for manufacturing molten irons by hot compacting fine direct reduced irons
CN113631728A (zh) * 2019-02-13 2021-11-09 丹尼尔和科菲森梅克尼齐有限公司 直接还原系统和相关工艺
CN113631728B (zh) * 2019-02-13 2022-12-16 丹尼尔和科菲森梅克尼齐有限公司 直接还原系统和相关工艺
EP4127250A4 (fr) * 2020-03-24 2024-05-29 Midrex Technologies, Inc. Intégration d'une installation de réduction directe et d'un four de fusion électrique de fer à réduction directe pour la production de fer haute performance
US12421564B2 (en) 2020-03-24 2025-09-23 Midrex Technologies, Inc. Iron (DRI) between a DRI source and processing equipment for the DRI

Also Published As

Publication number Publication date
AU1291100A (en) 2000-07-03
AR021611A1 (es) 2002-07-31
IT1302814B1 (it) 2000-09-29
ITUD980215A1 (it) 2000-06-11

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