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EP0139310A1 - Procédé pour la production de fer liquide contenant du carbone par réduction de fer spongieux - Google Patents

Procédé pour la production de fer liquide contenant du carbone par réduction de fer spongieux Download PDF

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Publication number
EP0139310A1
EP0139310A1 EP84201106A EP84201106A EP0139310A1 EP 0139310 A1 EP0139310 A1 EP 0139310A1 EP 84201106 A EP84201106 A EP 84201106A EP 84201106 A EP84201106 A EP 84201106A EP 0139310 A1 EP0139310 A1 EP 0139310A1
Authority
EP
European Patent Office
Prior art keywords
electrical energy
iron
sponge iron
carbon
sponge
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.)
Granted
Application number
EP84201106A
Other languages
German (de)
English (en)
Other versions
EP0139310B1 (fr
Inventor
Lothar Formanek
Martin Hirsch
Wolfram Dr. Schnabel
Harry Dr. Serbent
Klaus Dietrich Fritzsche
Heribert Koenig
Gero Dr. Rath
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.)
Vodafone GmbH
GEA Group AG
Original Assignee
Metallgesellschaft AG
Mannesmann AG
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 Metallgesellschaft AG, Mannesmann AG filed Critical Metallgesellschaft AG
Publication of EP0139310A1 publication Critical patent/EP0139310A1/fr
Application granted granted Critical
Publication of EP0139310B1 publication Critical patent/EP0139310B1/fr
Expired 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/10—Arrangements for using waste heat
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S75/00—Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures
    • Y10S75/958—Specialized metallurgical processes, compositions for use therein, consolidated metal powder compositions, and loose metal particulate mixtures with concurrent production of iron and other desired nonmetallic product, e.g. energy, fertilizer

Definitions

  • the invention relates to a method for producing liquid, carbon-containing iron (hot metal) by direct reduction of iron oxide-containing materials by means of solid carbon-containing reducing agents to sponge iron and melting of sponge iron in an electric reduction furnace.
  • arc furnace is to be understood as directly heated arc furnace in which the heating is carried out by electric arcs burning between the electrodes and the metallic insert or the steel bath (direct arc furnace). For this reason, a process for melting iron sponge in electric reduction furnaces was developed.
  • electrolytic furnaces is to be understood as furnaces in which electrodes are preferably immersed either in an open or half-covered slag bath or in a standing Möller column and in which the energy conversion takes place mainly through resistance heating in the slag bath (submerged arc furnace).
  • Direct reduction using solid carbon-containing reducing agents produces an iron sponge that contains considerably less carbon.
  • the carbon content is generally below 0.5%.
  • part of the sponge iron with poorer metallurgical properties i.e. with less metallization and / or smaller grain size.
  • melting this sponge iron with poorer metallurgical properties causes difficulties and may require additional costs.
  • the invention has for its object to melt the sponge iron produced by direct reduction with solid carbon-containing reducing agents, and in particular the resulting portion with poorer metallurgical properties, in a simple and economical manner.
  • This object is achieved according to the invention in that the exhaust gas from the direct reduction is used to generate electrical energy, the electrical energy is passed into the electroreduction furnace, and an amount of sponge iron corresponding to the quantity of electrical energy generated is used in the electroreduction furnace, at least part of the sponge iron is used, which has poorer metallurgical properties.
  • the sensible heat and the latent heat of the direct reduction exhaust gas released by post-combustion are used to generate steam, and the steam is used to generate electrical energy which is conducted into the electric reduction furnace.
  • the amount of sponge iron used is regulated so that the desired hot metal is melted with the electrical energy generated.
  • "Hot metal” is understood to mean an iron unsaturated in carbon with about 1.8 to 2.5% C. For reasons of reaction kinetics, the hot metal cannot be saturated with carbon. A corresponding amount of carbon is added to the furnace to achieve this carbon content. Short-term fluctuations in the amount of electrical energy generated do not interfere, since the electric reduction furnace can be operated with variable power consumption. In the event of long-term fluctuations, regulation can be carried out using the amount of sponge iron used.
  • iron sponge obtained in direct reduction is not processed, a mixture of iron sponge with metallurgically poorer and metallurgically better properties is used in the electric reduction furnace. When processing takes place, only the sponge iron with poorer metallurgical properties is used. Only when this amount is too small will the better one
  • Sponge iron also used.
  • the sponge iron not used in the electric reduction furnace can be sold or used for other purposes.
  • the electric reduction furnace can be used when hot.
  • the hot metal produced can be cast, granulated or processed further in liquid form.
  • the direct reduction takes place in particular in the rotary kiln, but can also be done in other ways, e.g. in the circulating fluidized bed using fine-grained ores.
  • a preferred embodiment is that the sponge iron is subjected to a treatment before being used in the electric reduction furnace; and the fraction of sponge iron with poorer metallurgical properties that is produced during the treatment is used in the electric reduction furnace.
  • the preparation takes place by sieving and magnetic separation. It can be carried out as a hot or cold preparation. The following fractions can occur during processing: coarse sponge iron, fine-grained sponge iron, excess carbon, ash and desulfurizing agent. This makes it possible to use the entire portion of the sponge iron with poorer metallurgical properties in the electric reduction furnace and to sell the portion which has the better metallurgical properties or to send it for further processing.
  • the preparation can take place in such a way that the part with the best metallurgical properties is obtained for sale or further processing.
  • the separated carbon excess can be used for this, in particular one which is of good quality, ie whose ash and sulfur content is relatively low.
  • the coals Excess material can also be returned to direct reduction or used for other purposes.
  • a preferred embodiment is that the hot metal generated in the electric reduction furnace is carburized.
  • the carburization is expediently carried out in a pan with the addition of carbon.
  • the hot metal is overheated in the electric reduction furnace to such an extent that it reaches the carburizing stage at a temperature which is approximately 150 ° C. above the liquidus line.
  • Excess carbon from the direct reduction can be used as carbon.
  • the carburization can take place up to a C content of up to about 4%.
  • a particularly preferred embodiment is that the hot metal or the pig iron is blown into steel with the addition of sponge iron as a coolant.
  • the blowing into steel takes place by means of oxygen-containing gases, preferably technically pure oxygen, in a converter.
  • the sponge iron with better metallurgical properties which is obtained after processing, is preferably used as the coolant.
  • the sponge iron with poorer metallurgical properties is melted down with optimal utilization of the heat content of the exhaust gas of the direct reduction, and the sponge iron with better metallurgical properties is used to produce steel.
  • the system is very flexible. Excess sponge iron with good metallurgical properties can still be used for other purposes. Part of the electrical energy generated can be used to generate oxygen.
  • a preferred embodiment is that the temperature and / or the content of combustible components of the Ab gases of the direct reduction to increase the amount of electrical energy generated.
  • the temperature and / or the content of combustible constituents are increased via the values required for direct reduction. This can be done by using coal with a high volatile content, which is not used in direct reduction, or by using larger amounts of coal. As a result, a larger part of the sponge iron can be melted down.
  • a preferred embodiment is that the exhaust gas from the electric reduction furnace is used to generate electrical energy. As a result, a larger part of the sponge iron can be melted down.
  • a preferred embodiment is that the exhaust gas from the converter is used to generate electrical energy. As a result, a larger part of the sponge iron can be melted down.
  • a preferred embodiment is that additional electrical energy is generated by burning carbon.
  • the separated carbon excess of the direct reduction can be used as carbon.
  • carbon with poor metallurgical properties - such as a high ash and sulfur content - can be used easily and effectively in this way.
  • cheap coal, but also gas or oil can be used.
  • the combustion is preferably carried out in a circulating fluidized bed. Such methods are described in DE-AS 2 539 546, US Pat. No. 4,165,717, DE-OS 2,624,3o2, US Pat. No. 4,111,158.
  • the generation of electrical energy from the hot combustion gases can be carried out together with the generation of energy from the Exhaust gas of the direct reduction or separately from this.
  • Ine configuration is that the additionally generated amount of electrical energy is controlled so that the entire sponge iron is melted into hot metal in the electric reduction furnace.
  • the entire sponge iron can be processed into a valuable primary material with a significantly smaller volume and problem-free properties with regard to transport and storage.
  • One embodiment is that the additional amount of electrical energy generated is controlled so that the entire sponge iron is processed into steel. If e.g. the electrical energy generated with exhaust gas is sufficient for melting 5o% of the sponge iron into hot metal and for blowing this hot metal into steel another 2o% of the sponge iron is required as a coolant, 3o% iron sponge remains as the rest. Then so much additional electrical energy is generated that of the remaining 30% iron sponge, such an amount is melted into hot metal that, when blown into steel, requires the rest of the rest as a coolant. As a result, the entire sponge iron can be melted into a high-quality end product and processed.
  • One embodiment is that missing electrical energy is taken from the network. Due to the extensive control options in the production of the hot metal, the missing electrical energy can be drawn from the network in a largely constant amount. It is therefore not necessary to have a very powerful network that could also deliver short, high peak values.
  • a preferred embodiment is that the blowing into steel takes place with the addition of energy sources.
  • the energy sources can be introduced in solid, gaseous or liquid state in a blower unit, for example in the form of fine-grained coal, and blown into the bath.
  • a blower unit for example in the form of fine-grained coal
  • the heat required is largely generated by burning carbon in the bathroom. If the carbon introduced with the feed materials is not sufficient to cover the required amount of heat, the missing amount of heat can be directly and economically brought in by primary energy.
  • the system is made very flexible by adding the energy sources. If for example.
  • the amount of oxygen generated with the exhaust gases is sufficient to produce the desired amount of steel, but the amount of electrical energy generated with the exhaust gases is not sufficient to produce the required amount of hot metal or pig iron, by adding the energy sources a correspondingly larger amount of sponge iron and / or scrap is fed into the blow-molding unit. Fluctuations in power generation can be absorbed in the same way. This rule possibility exists both in the V of a portion of the E erblasung isenschwammes as well as the entire sponge iron to steel.
  • the oxygen can also be generated by means of a steam turbine, which is connected directly to the compressor.
  • the oxygen generated can be stored and used as a buffer for operational fluctuations.
  • Gas turbines can also be used to generate electricity.
  • the invention is illustrated by a figure.
  • the feed 2 consisting of iron ore, coal and aggregates, is charged in the rotary kiln 1.
  • the reduced material 3 is placed in the preparation 4, which consists of sieving and magnetic separation. To simplify matters, only one output is shown for each product.
  • the sponge iron with poorer metallurgical properties 5 is charged into the electric reduction furnace 6.
  • the exhaust gas 7 from the rotary kiln 1 is fed into the electrical power generation 8, which consists of afterburning, steam generation and power generation. Electrical energy 9 is conducted into the electric reduction furnace 6.
  • the hot metal 10o produced is carburized in the carburization 11, which consists of a pan.
  • the ekohlte on 12 g of iron is charged into the converter 13 and blown with addition of sponge iron having good metallurgical properties 14 as a coolant to steel 15th
  • the exhaust gas 16 of the electric reduction furnace 6 and the exhaust gas 17 of the converter 13 are also conducted into the electrical power generation 8.
  • Ash and desulfurizing agent are removed from treatment 4 as outlets 19.
  • the excess carbon-containing material with poor metallurgical properties 2o is passed into the combustion 21, which consists of a circulating fluidized bed and is fed into the further carbon-containing material 22.
  • the hot combustion gases 23 are conducted into the electrical energy generation 8.
  • Electrical energy 24 is conducted into the oxygen generation 25.
  • the oxygen 26 is inserted into the converter 13. Missing electrical energy can be drawn from a network 27. Part of the E isenschwamms with good metallurgical properties 14 a can be removed for other purposes. Instead of the excess carbon-containing material 18a, 18b, 18c, other carbon can also be used. When the hot metal 1 0 or carburized iron 12 is not blown to steel, it is poured or granulated.
  • Energy carriers can be introduced into the converter 13 via line 28, e.g. fine-grained coal can be blown into the bath.
  • the advantages of the invention are that the iron sponge obtained in the direct reduction with solid, carbon-containing reducing agents, which contains a relatively low carbon content, can be melted down with optimum use of the heat content of the exhaust gases.
  • the portion of the sponge iron that has poorer metallurgical properties can be processed into an intermediate product that can be used without restriction. An integrated process without external energy or with cheaply produced external energy is possible. The process can be operated very variably.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Blast Furnaces (AREA)
EP84201106A 1983-08-25 1984-07-28 Procédé pour la production de fer liquide contenant du carbone par réduction de fer spongieux Expired EP0139310B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3330625 1983-08-25
DE3330625 1983-08-25
DE3334221 1983-09-22
DE19833334221 DE3334221A1 (de) 1983-08-25 1983-09-22 Verfahren zur erzeugung von fluessigem, kohlenstoffhaltigem eisen aus eisenschwamm

Publications (2)

Publication Number Publication Date
EP0139310A1 true EP0139310A1 (fr) 1985-05-02
EP0139310B1 EP0139310B1 (fr) 1988-10-19

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ID=25813456

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84201106A Expired EP0139310B1 (fr) 1983-08-25 1984-07-28 Procédé pour la production de fer liquide contenant du carbone par réduction de fer spongieux

Country Status (12)

Country Link
US (1) US4551172A (fr)
EP (1) EP0139310B1 (fr)
JP (1) JPH0680167B2 (fr)
AU (1) AU564718B2 (fr)
BR (1) BR8404219A (fr)
CA (1) CA1224336A (fr)
DE (2) DE3334221A1 (fr)
ES (1) ES8504943A1 (fr)
GR (1) GR80186B (fr)
ID (1) ID807B (fr)
PH (1) PH21947A (fr)
TR (1) TR22714A (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0269609A1 (fr) * 1986-11-25 1988-06-01 Deutsche Voest-Alpine Industrieanlagenbau Gmbh Procédé et installation pour l'obtention d'énergie électrique en plus de la production de la fonte liquide
EP0282321A3 (en) * 1987-03-13 1989-01-25 The Boc Group Plc Power generation
WO1989001981A1 (fr) * 1987-08-31 1989-03-09 Northern States Power Company Procede de cogeneration permettant la production d'energie et de matieres ferreuses, y compris l'acier
US5045112A (en) * 1988-02-08 1991-09-03 Northern States Power Company Cogeneration process for production of energy and iron materials, including steel
US5055131A (en) * 1987-08-31 1991-10-08 Northern States Power Company Cogeneration process for production of energy and iron materials
US5064174A (en) * 1989-10-16 1991-11-12 Northern States Power Company Apparatus for production of energy and iron materials, including steel
US5066325A (en) * 1987-08-31 1991-11-19 Northern States Power Company Cogeneration process for production of energy and iron materials, including steel
DE102009001646B3 (de) * 2009-03-18 2010-07-22 Daou, Rafic Boulos, Bdadoun Stahlerzeugungseinrichtung
DE102010002523A1 (de) 2009-03-18 2010-09-23 Daou, Rafic Boulos, Bdadoun Stahlerzeugungseinrichtung

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3428782A1 (de) * 1984-08-04 1986-02-13 Metallgesellschaft Ag, 6000 Frankfurt Verfahren zur erzeugung von eisenschwamm
US5124008A (en) * 1990-06-22 1992-06-23 Solv-Ex Corporation Method of extraction of valuable minerals and precious metals from oil sands ore bodies and other related ore bodies
JPH09202909A (ja) 1996-01-26 1997-08-05 Nippon Steel Corp 溶融還元設備ならびに操業方法
US5810905A (en) * 1996-10-07 1998-09-22 Cleveland Cliffs Iron Company Process for making pig iron
JPH10195513A (ja) * 1996-12-27 1998-07-28 Kobe Steel Ltd 金属鉄の製法
DE102009053920A1 (de) 2009-11-19 2011-05-26 Sms Siemag Ag Verfahren und Vorrichtung zur Verminderung des metallurgischen Energiebedarfs von geschlossenen elektrischen Schmelz- und/oder Reduktionsöfen
DE102020116425A1 (de) 2020-06-22 2021-12-23 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung von Rohstahl mit niedrigem N-Gehalt
CN115652012B (zh) * 2022-09-08 2024-05-07 中冶赛迪工程技术股份有限公司 一种氢基竖炉产海绵铁的渗碳冷却与煤气利用方法、系统及其应用
EP4417713A1 (fr) 2023-02-14 2024-08-21 Oterdoom, Harmen Le nouveau procédé (semi-)continu en deux étapes pour le laitier propre et l'acier ou la fonte chaude

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LU35901A1 (fr) *
US1338439A (en) * 1918-07-19 1920-04-27 Guyon F Greenwood Metallurgical method and apparatus
US1407372A (en) * 1918-08-10 1922-02-21 Walter E F Bradley Reduction of ores
US1902089A (en) * 1927-07-25 1933-03-21 William P Deppe Process of mineral reduction and metal extraction
US2292305A (en) * 1941-10-27 1942-08-04 Alfred M Thomsen Iron sulphide metallurgy
US3052533A (en) * 1961-03-27 1962-09-04 Alfred M Thomsen Process for the direct reduction of iron
GB958731A (en) * 1962-06-29 1964-05-27 Ass Elect Ind Means for supplying heated air to blast furnaces
FR2011575A1 (fr) * 1968-06-24 1970-03-06 Gutehoffnungshuette Sterkrade
CA848890A (en) * 1967-07-08 1970-08-11 Whigham William Production of iron and steel
FR2097183A3 (en) * 1970-07-04 1972-03-03 Puhlmann Peter Steel prodn - in an arc furnace, using a continuous smelt cycle
FR2158350A1 (fr) * 1971-11-01 1973-06-15 Stora Kopparbergs Bergslags Ab
US3888658A (en) * 1970-11-02 1975-06-10 Westinghouse Electric Corp Process for the direct reduction of iron ore to steel
DE2628972A1 (de) * 1976-06-28 1978-01-05 Benteler Geb Paderwerk Verfahren zur kontinuierlichen erzeugung von stahl
US4094665A (en) * 1977-05-13 1978-06-13 Stora Kopparbergs Bergslags Ab Method for simultaneous combined production of electrical energy and crude iron
EP0056710A2 (fr) * 1981-01-15 1982-07-28 ASEA Limited Récupération de l'énergie de courants de gaz perdus

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US3224871A (en) * 1961-02-24 1965-12-21 Elektrokemisk As Process of preheating ores for reduction in smelting furnace
DE2734961B2 (de) * 1977-08-03 1980-02-28 Gottfried Bischoff Bau Kompl. Gasreinigungs- Und Wasserrueckkuehlanlagen Gmbh & Co Kg, 4300 Essen Konverteranlage für das Frischen von Stahl aus Roheisen
US4244732A (en) * 1979-03-27 1981-01-13 Kaiser Engineers, Inc. Manufacture of steel from ores containing high phosphorous and other undesirable constituents
JPS58185703A (ja) * 1982-04-21 1983-10-29 Nippon Steel Corp 電気炉による製鉄方法
DE3300867A1 (de) * 1983-01-13 1984-07-19 Mannesmann AG, 4000 Düsseldorf Verfahren zur erzeugung von stahl durch einschmelzen von eisenschwamm im lichtbogenofen

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU35901A1 (fr) *
US1338439A (en) * 1918-07-19 1920-04-27 Guyon F Greenwood Metallurgical method and apparatus
US1407372A (en) * 1918-08-10 1922-02-21 Walter E F Bradley Reduction of ores
US1902089A (en) * 1927-07-25 1933-03-21 William P Deppe Process of mineral reduction and metal extraction
US2292305A (en) * 1941-10-27 1942-08-04 Alfred M Thomsen Iron sulphide metallurgy
US3052533A (en) * 1961-03-27 1962-09-04 Alfred M Thomsen Process for the direct reduction of iron
GB958731A (en) * 1962-06-29 1964-05-27 Ass Elect Ind Means for supplying heated air to blast furnaces
CA848890A (en) * 1967-07-08 1970-08-11 Whigham William Production of iron and steel
FR2011575A1 (fr) * 1968-06-24 1970-03-06 Gutehoffnungshuette Sterkrade
FR2097183A3 (en) * 1970-07-04 1972-03-03 Puhlmann Peter Steel prodn - in an arc furnace, using a continuous smelt cycle
US3888658A (en) * 1970-11-02 1975-06-10 Westinghouse Electric Corp Process for the direct reduction of iron ore to steel
FR2158350A1 (fr) * 1971-11-01 1973-06-15 Stora Kopparbergs Bergslags Ab
DE2628972A1 (de) * 1976-06-28 1978-01-05 Benteler Geb Paderwerk Verfahren zur kontinuierlichen erzeugung von stahl
US4094665A (en) * 1977-05-13 1978-06-13 Stora Kopparbergs Bergslags Ab Method for simultaneous combined production of electrical energy and crude iron
EP0056710A2 (fr) * 1981-01-15 1982-07-28 ASEA Limited Récupération de l'énergie de courants de gaz perdus

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Title
STAHL UND EISEN, Band 97, Nr. 15, 28. Juli 1977, Seiten 723-731, Düsseldorf, DE; H.P. HAASTERT et al.: "Metallurgische und verfahrenstechnische Gesichtspunkte beim Einsatz von Eisenschwammbriketts in Sauerstoffaufblaskonvertern" *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0269609A1 (fr) * 1986-11-25 1988-06-01 Deutsche Voest-Alpine Industrieanlagenbau Gmbh Procédé et installation pour l'obtention d'énergie électrique en plus de la production de la fonte liquide
US4861369A (en) * 1986-11-25 1989-08-29 Korf Engineering Gmbh Process for gaining electric energy in addition to producing molten pig iron and an arrangement for carrying out the process
EP0282321A3 (en) * 1987-03-13 1989-01-25 The Boc Group Plc Power generation
WO1989001981A1 (fr) * 1987-08-31 1989-03-09 Northern States Power Company Procede de cogeneration permettant la production d'energie et de matieres ferreuses, y compris l'acier
US5055131A (en) * 1987-08-31 1991-10-08 Northern States Power Company Cogeneration process for production of energy and iron materials
US5066325A (en) * 1987-08-31 1991-11-19 Northern States Power Company Cogeneration process for production of energy and iron materials, including steel
US5045112A (en) * 1988-02-08 1991-09-03 Northern States Power Company Cogeneration process for production of energy and iron materials, including steel
US5064174A (en) * 1989-10-16 1991-11-12 Northern States Power Company Apparatus for production of energy and iron materials, including steel
DE102009001646B3 (de) * 2009-03-18 2010-07-22 Daou, Rafic Boulos, Bdadoun Stahlerzeugungseinrichtung
DE102010002523A1 (de) 2009-03-18 2010-09-23 Daou, Rafic Boulos, Bdadoun Stahlerzeugungseinrichtung
WO2010106466A1 (fr) 2009-03-18 2010-09-23 Rafic Boulos Daou Installation de production d'acier
US9453682B2 (en) 2009-03-18 2016-09-27 Rafic Boulos Daou Steel production facility

Also Published As

Publication number Publication date
ES535324A0 (es) 1985-05-01
AU564718B2 (en) 1987-08-20
US4551172A (en) 1985-11-05
DE3474690D1 (en) 1988-11-24
CA1224336A (fr) 1987-07-21
JPS60116706A (ja) 1985-06-24
AU3238884A (en) 1985-02-28
PH21947A (en) 1988-04-15
BR8404219A (pt) 1985-07-23
GR80186B (en) 1985-01-02
JPH0680167B2 (ja) 1994-10-12
ES8504943A1 (es) 1985-05-01
ID807B (id) 1996-07-11
TR22714A (tr) 1988-04-28
EP0139310B1 (fr) 1988-10-19
DE3334221A1 (de) 1985-03-14

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