EP1383933B1 - Procede de production de fonte liquide dans un four electrique - Google Patents
Procede de production de fonte liquide dans un four electrique Download PDFInfo
- Publication number
- EP1383933B1 EP1383933B1 EP02719871A EP02719871A EP1383933B1 EP 1383933 B1 EP1383933 B1 EP 1383933B1 EP 02719871 A EP02719871 A EP 02719871A EP 02719871 A EP02719871 A EP 02719871A EP 1383933 B1 EP1383933 B1 EP 1383933B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- process according
- carbon
- fines
- electric arc
- previous
- 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.)
- Expired - Lifetime
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 48
- 229910052742 iron Inorganic materials 0.000 title claims description 24
- 238000004519 manufacturing process Methods 0.000 title description 23
- 239000000155 melt Substances 0.000 title description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 54
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 47
- 238000010891 electric arc Methods 0.000 claims description 43
- 239000002893 slag Substances 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 29
- 239000007789 gas Substances 0.000 claims description 28
- 239000001301 oxygen Substances 0.000 claims description 26
- 229910052760 oxygen Inorganic materials 0.000 claims description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 25
- 230000008569 process Effects 0.000 claims description 23
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 239000003638 chemical reducing agent Substances 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 12
- 230000009467 reduction Effects 0.000 claims description 12
- 238000005187 foaming Methods 0.000 claims description 8
- 239000011261 inert gas Substances 0.000 claims description 8
- 206010039509 Scab Diseases 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 230000007935 neutral effect Effects 0.000 claims description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 2
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 2
- 239000004571 lime Substances 0.000 claims description 2
- 239000000395 magnesium oxide Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 claims 3
- 238000013019 agitation Methods 0.000 claims 3
- 239000000567 combustion gas Substances 0.000 claims 2
- 239000003610 charcoal Substances 0.000 claims 1
- 230000004907 flux Effects 0.000 claims 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims 1
- 239000004575 stone Substances 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 description 34
- 239000002184 metal Substances 0.000 description 34
- 229910001018 Cast iron Inorganic materials 0.000 description 15
- 229910052717 sulfur Inorganic materials 0.000 description 13
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 12
- 239000003245 coal Substances 0.000 description 12
- 239000002245 particle Substances 0.000 description 12
- 239000011593 sulfur Substances 0.000 description 12
- 238000006722 reduction reaction Methods 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 238000002844 melting Methods 0.000 description 10
- 230000008018 melting Effects 0.000 description 9
- 229910001111 Fine metal Inorganic materials 0.000 description 7
- 238000003287 bathing Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 230000004927 fusion Effects 0.000 description 5
- 229910001338 liquidmetal Inorganic materials 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000000571 coke Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000011449 brick Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000001465 metallisation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000003923 scrap metal Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229940105847 calamine Drugs 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000007499 fusion processing Methods 0.000 description 1
- 235000021189 garnishes Nutrition 0.000 description 1
- 229910052864 hemimorphite Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000013386 optimize process Methods 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000010405 reoxidation reaction Methods 0.000 description 1
- 230000018040 scab formation Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 235000014692 zinc oxide Nutrition 0.000 description 1
- CPYIZQLXMGRKSW-UHFFFAOYSA-N zinc;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Fe+3].[Fe+3].[Zn+2] CPYIZQLXMGRKSW-UHFFFAOYSA-N 0.000 description 1
Images
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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
- C21B11/10—Making pig-iron other than in blast furnaces in electric furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
- C21B13/0026—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide in the flame of a burner or a hot gas stream
Definitions
- the invention relates to a method for producing molten iron.
- Direct reduction processes (without passage through a liquid phase) using coal as reductant are the most economical and this especially in countries without a natural gas resource.
- a disadvantage of these processes are that they give a high sulfur content prereduced (0.3-0.6% w / w S).
- fine metal will be understood to mean all kinds of products comprising partially oxidized metallic iron.
- the metallic fines represent iron ore particles, waste particles of all kinds containing partially oxidized iron and in particular dust from blast furnace and electric ovens, straws or calamine particles (iron oxides formed during reheating or rolling), rolling sludge or machining etc.
- the object of the present invention is to propose a method for producing optimized cast.
- WO-A-00 79 012 discloses all these features.
- the proposed method uses the electric arc furnace in a process very particular, consisting of charging prereduced metal fines hot (preferably directly at the outlet of the reduction furnace, that is to say at a temperature above 500 ° C and particularly preferably between 800 and 1100 ° C) and working on a cast iron foot topped with a layer of non-foaming liquid slag.
- Bath foot stirring can by injecting a neutral gas (nitrogen, argon) through the oven floor and / or by injecting oxygen-containing gas by means of one or more spears.
- the bathing foot is very strongly stirred by gas injection. This brewing very energetic makes it possible to homogenize in temperature the bath + metal milk and renew the surface of the slag layer so that it remains overheated and well liquid, and able to absorb prereduced metal fines without these do not solidify and form an impassable crust.
- the flow of the inert gas in the proposed process is preferably between 50 l / min. t. (liters per minute and per ton of liquid metal in the bath) and 150 l / min. t.
- the brewing rate is between 80 and 120 l / min.t. These flows are to be adjusted according to the height of the bathing foot and the number and position of injection points. This high brewing rate is unrelated to the common practice in electric arc furnace. Indeed, the brewing rate in the conventional processes for producing steel in an electric arc furnace is in the range of 1 to 10 l / min.t and is intended only to homogenize the bath and to regulate metallurgical results and temperature.
- the metal bath foot must have a certain minimum height, preferably a height of at least 0.3 m, to ensure an energetic mixing of the molten metal bath. Care must be taken avoid that the injection of the brewing gas through the oven hearth simply a "hole" through the metal bath, without putting it energetically in motion.
- this minimum height may vary depending on the configuration of the electric arc furnace and the location of the gas injection means which are preferably porous bricks or nozzles.
- gas injection means of brewing are positioned near the outer edge of the hearth of the electric arc furnace, that is to say laterally at the bottom of the bath, so as to bring back to the zone warmer central, located between the electrodes, fine metal particles pre-reduced remaining or tending to agglomerate at the edge of the oven.
- stirring the foot bath is performed by injecting oxygen-containing gas by means of one or several injectors.
- oxygen-containing gas called by the "primary oxygen”
- this oxygen-containing gas By injecting this oxygen-containing gas (called by the "primary oxygen") in the foot of bath by means of a penetrating jet, it is form bubbles of CO gas by reaction with the C of the cast iron. This release of CO in the liquid metal creates turbulence that ensures a mixing vigorous foot bath and slag.
- prereduced metal fines In order to protect the prereduced metal fines during their fall in the furnace, they are surrounded by a curtain of inert gas, preferably nitrogen or argon.
- the curtain of inert gas preferably annular in shape, makes it possible to minimize the lateral flight of the particles by the suction of the oven and the reoxidation of the prereduced metal fines before these reach the slag layer or the bathing foot respectively.
- a flow rate of nitrogen of the order of 50 Nm 3 / h at 200 ° Nm 3 / h is preferably used to form the protective curtain and thus to protect the transfer of approximately 10 to 60 t / h of metal fines.
- prereduced compounds comprising of the order of 50% Fe metallized at a rate of between 60 and 100%. These values depend on many factors such as furnace geometry, drop height of fines, turbulence inside the electric arc furnace etc. and must be adapted accordingly.
- the transfer of the prereduced metal fines is carried out in the central region of the electric arc furnace, located between the electrodes.
- coal is preferably blended. a diameter of between 2 and 20 mm with very small metallic fines before charging in the electric arc furnace.
- the amount of coal put depends on the amount of carbon contained in the metal fines pre-reduced. It is intended to have a carbon excess of between 7% and 15% and preferably close to 10%. In this way, it is possible to get a cast to 3-3.5% C, 0.01 - 0.05% Si and 0.03 - 0.06% S depending on the S content of the coal.
- agents are additionally added. slag formation during step a) and / or step b).
- These training agents slag are preferably selected from the group consisting of lime, and magnesia, and their mixtures.
- the excess carbon at the end of step a) is advantageously between 7% and 15% and preferably close to 10%.
- the solid carbon reductant is selected from coal or petroleum products liquid or solid.
- the volatile fractions contained in the reductant carbon dioxide are removed during their stay inside the multi-stage furnace, the sulfur also partly.
- excess carbon is consumed during step d). Moreover, excess free carbon is useful for terminating the reduction reactions and for carburize the cast iron.
- This objective is achieved by a process for producing molten iron in a electric arc furnace described above in which are arranged one or more post-combustion lances, - possibly associated with one or more injectors primary oxygen - constituting burners of comparable power to those of electric arcs.
- injectors deliver jets of afterburner gas preferably between arcs, particularly preferred on the circle of electrodes ("electrode pitch circle").
- the afterburner gas jets in such a way as to push the slag into the central part of the electric arc furnace between the electrodes.
- the strong turbulence in the slag overheated in this region can increase the flow of fine metal without risking the formation of crusts.
- the turbulence in the slag are created rather indirectly by the brewing of the foot bath by injecting neutral gas through the hearth of the electric arc furnace and / or by injecting primary oxygen into the bath foot by means of one or several injectors. Injecting afterburner gas directly into the slag layer allows better control and orientation of the movements of slag in the electric arc furnace, accelerate the melting of fine metal and to minimize the risk of unmelted metal fines being pushed and glued to the wall as well.
- One of the advantages of the present method is that the operation of both reactors is optimized. Indeed, the fact of producing a pre-reduced product comprising a free carbon excess increases the speed of reduction and increases the rate of metallization.
- Fig.1 illustrates a schematic sectional view of an electric arc furnace for the production of liquid iron according to a first embodiment of the present invention.
- FIG. 10 It shows an electric arc furnace 10 comprising a tank 12 surmounted of a cover 14 through which three electrodes 16 penetrate. These electrodes 16 are capable of producing arcs of about twenty centimeters and one power of about 4 MW each. In the middle of these three electrodes 16 is placed the transfer device 18 prereduced metal fines. These measures 18 comprises on the one hand a fall to transfer the prereduced metal fines in the oven 12 and on the other hand an injection nozzle for injecting a curtain of nitrogen 20 surrounding the prereduced metal fines during their fall in the oven.
- the point of impact of the prereduced metal fines is between the three electrodes 16, that is to say at the hottest part of the electric arc furnace 12. moment of impact on the slag layer 22 non-foaming supernatant bath of liquid metal 24, the prereduced metal fines are immediately integrated in it and melt quickly.
- the sole 26 of the tank 12 is provided with several porous bricks 28 by which is injected a high flow of mixing gas 30. Turbulence created by the injection of this gas 30 through the liquid bath 24 prevents the Precured metal fines do not agglomerate and form crusts.
- Fig. 2 shows a sectional view of an electric arc furnace for production of liquid iron according to a second embodiment of the invention.
- Fig. 3 shows a top view of this electric arc furnace.
- the afterburner lances 32 each inject a jet of oxygen of post-combustion 36 or secondary oxygen in the slag layer 22.
- These jets of secondary oxygen 36 are softer, less penetrating than jets primary oxygen 34 and burn the CO emanating from the bathing foot 24 following the injection of primary oxygen. CO is therefore burned inside the slag layer 22. This leads to local overheating of the slag.
- the jets of post-combustion oxygen 36 are oriented to print to the slag impulses opposed to those of the arches, in order to reinforce the mixing of the slag and to flow back the slag towards the center of the electric arc furnace.
- the production of 54 or 57 t / h of DRI at 60% metallization could be provided by a furnace with a capacity of 50% of the capacity that would be needed to produce 50 t / h of DRI 90% metallized.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Manufacture Of Iron (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
- Fig.1:
- Vue en coupe d'un four électrique à arc pour la production de fonte liquide selon un premier mode de réalisation de l'invention,
- Fig.2:
- Vue en coupe d'un four électrique à arc pour la production de fonte liquide selon un deuxième mode de réalisation de l'invention,
- Fig.3:
- Vue de dessus d'un four électrique à arc selon la Fig. 2
- soit de fondre un débit de fines métalliques ou (DRI) au moins double,
- soit d'enfourner des fines métalliques ou (DRI) moins métallisé, et ainsi d'accroítre la productivité du four de réduction - quelle que soit la technologie employée.
| Chiffrage pour la fusion de DRI enfourné à 1000°C en fonte à 3%C, coulée à 1500°C : | |||||||
| Teneur Fe DRI % | Degré metallis % | C libre DRI % | Débit DRI t/h | Débit fonte t/h | Puiss. Électr. MW | Débit Oxygène Nm3/h | Débit C compl. t/h |
| 80 | 90 | 8 | 50 | 40 | 12 | 0 | 0 |
| 80 | 90 | 8 | 125 | 100 | 12 | 3000 | 2,4 |
| 74 | 60 | 8 | 54 | 40 | 12 | 3600 | 2,6 |
| 71 | 60 | 12 | 57 | 40 | 12 | 3600 | 0 |
- 10
- Four électrique à arc
- 12
- Cuve
- 14
- Voûte
- 16
- Electrodes
- 18
- Dispositif de transfert
- 20
- Rideau d'azote
- 22
- Couche de laitier
- 24
- Bain de métal liquide
- 26
- Sole
- 28
- Briques poreuses
- 30
- Gaz inerte
- 32
- lances de postcombustion
- 32'
- injecteurs d'oxygène primaire
- 33
- Arcs électriques
- 34
- jets d'oxygène primaire
- 36
- jet d'oxygène de postcombustion
- 38
- mouvement du laitier
Claims (14)
- Procédé de production de fonte liquide dans un four électrique à arc comprenant plusieurs électrodes, équipé d'une sole et contenant un pied de bain surmonté d'un laitier liquide non moussant, le procédé comprenant les étapes suivantes :a) réduction de fines métalliques pour former des fines métalliques préréduites comprenant un excès de carbone libre,b) transfert à chaud des fines métalliques préréduites à l'intérieur d'un rideau d'un gaz inerte dans un pied de bain contenu dans le four électrique à arc,c) brassage du pied de bain par injection de gaz de manière à éviter la formation de croûtes,d) fusion des fines métalliques préréduites dans le four électrique à arc pour obtenir de la fonte liquide.
- Procédé selon la revendication 1, caractérisé en ce que le transfert des fines métalliques préréduites est effectué par gravité.
- Procédé selon la revendication 1 ou 2, caractérisé en ce que le transfert des fines métalliques préréduites est réalisé dans une région située entre les électrodes du four électrique à arc.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le brassage du pied de bain est réalisé par injection de gaz neutre à travers la sole du four électrique à arc à un débit compris entre 50 l/min. t et 150 l/min. t et de manière préférée à un débit entre 80 et 120 l/min.t.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le brassage du pied de bain est réalisé par une injection de gaz contenant de l'oxygène dans le pied de bain au moyen d'un ou plusieurs injecteurs.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'étape a) comprend les étapes suivantesa1) on introduit dans un four multi-étages comprenant plusieurs étages superposés les fines métalliques et on les dépose sur l'étage supérieur du four multi-étages,a2) on transfère les fines métalliques graduellement sur les étages inférieurs,a3) on ajoute à un ou plusieurs des étages inférieurs un réducteur carboné en une quantité suffisante pour réduire les fines métalliques et pour assurer un excès de carbone libre,a4) on chauffe le four multi-étages et on réduit les fines métalliques au contact du réducteur carboné et des gaz produits par le réducteur carboné à des températures adéquates,a5) on brûle l'excédent de gaz produit par le réducteur carboné à l'intérieur du four multi-étages et on met à profit la chaleur résultante pour sécher et préchauffer les fines métalliques.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que pendant l'étape a) ou l'étape b), on ajoute des agents de formation de laitier.
- Procédé selon la revendication 7, caractérisé en ce que les agents de formation de laitier sont choisis parmi le groupe constitué de chaux, de castine et de magnésie ainsi que de leurs mélanges.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'excès de carbone est compris entre 7% et 15% et de préférence voisin de 10%.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le réducteur carboné est du charbon.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on dévolatilise le réducteur carboné pendant l'étape a).
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le carbone en excès est consommé pendant l'étape d).
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le carbone en excès est consommé par injection d'un jet de gaz de postcombustion contenant de l'oxygène dans le laitier au moyen d'une ou plusieurs lances.
- Procédé selon la revendication 13, caractérisé en ce que le(s) jet(s) de gaz de postcombustion est (sont) orienté(s) de façon de créer un mouvement du laitier vers les électrodes du four électrique à arc.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU90735A LU90735B1 (fr) | 2001-02-23 | 2001-02-23 | Proc-d- de production de fonte liquide |
| LU90735 | 2001-02-23 | ||
| LU90788 | 2001-06-13 | ||
| LU90788A LU90788B1 (fr) | 2001-06-13 | 2001-06-13 | Procédé de production de fonte liquide dans un four électrique |
| PCT/EP2002/001749 WO2002068700A1 (fr) | 2001-02-23 | 2002-02-20 | Procede de production de fonte liquide dans un four electrique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1383933A1 EP1383933A1 (fr) | 2004-01-28 |
| EP1383933B1 true EP1383933B1 (fr) | 2005-05-18 |
Family
ID=26640378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02719871A Expired - Lifetime EP1383933B1 (fr) | 2001-02-23 | 2002-02-20 | Procede de production de fonte liquide dans un four electrique |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US7169205B2 (fr) |
| EP (1) | EP1383933B1 (fr) |
| JP (1) | JP4212895B2 (fr) |
| AU (1) | AU2002250975B2 (fr) |
| BR (1) | BR0207370B1 (fr) |
| CA (1) | CA2437254C (fr) |
| DE (2) | DE02719871T1 (fr) |
| ES (1) | ES2215498T3 (fr) |
| RU (1) | RU2268308C2 (fr) |
| WO (1) | WO2002068700A1 (fr) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6875251B2 (en) * | 2002-05-15 | 2005-04-05 | Hatch Ltd. | Continuous steelmaking process |
| EP1983066A1 (fr) * | 2007-03-30 | 2008-10-22 | Paul Wurth S.A. | Procédé de récupération du molybdène, du nickel, du cobalt ou de leurs mélanges à partir de catalyseurs usés ou régénérés |
| EP1997919A1 (fr) * | 2007-05-24 | 2008-12-03 | Paul Wurth S.A. | Procédé de valorisation de résidus riches en zinc et en sulfates |
| JP5166805B2 (ja) * | 2007-09-19 | 2013-03-21 | 株式会社神戸製鋼所 | アーク加熱による溶鉄製造方法 |
| JP5166804B2 (ja) * | 2007-09-19 | 2013-03-21 | 株式会社神戸製鋼所 | 溶鉄製造方法 |
| US8532158B2 (en) * | 2007-11-17 | 2013-09-10 | Inductotherm Corp. | Melting and mixing of materials in a crucible by electric induction heel process |
| US20160326606A1 (en) * | 2014-01-31 | 2016-11-10 | Saudi Basic Industries Corporation | Methods for producing improved steels by injecting iron containing by-products of an iron ore production process into liquid steel |
| ITUA20163986A1 (it) | 2016-05-31 | 2017-12-01 | Tenova Spa | Metodo ed apparato per la produzione di ghisa, ghisa prodotta secondo detto metodo |
| WO2019082762A1 (fr) | 2017-10-23 | 2019-05-02 | 新日鐵住金株式会社 | Four électrique et procédé de fusion et de réduction de matière première de fer contenant de l'oxyde de fer |
| RU2734215C1 (ru) * | 2020-04-16 | 2020-10-13 | Автономная некоммерческая организация «Научно-исследовательский институт проблем экологии» | Способ выплавки чугуна в доменной печи |
| DE102020205493A1 (de) | 2020-04-30 | 2021-11-04 | Sms Group Gmbh | Verfahren zum Herstellen von flüssigem Roheisen aus einem DRI-Produkt |
| US12158306B2 (en) | 2021-05-21 | 2024-12-03 | Fives North American Combustion, Inc. | Melting furnace purge system and method |
| US12497668B2 (en) * | 2022-03-11 | 2025-12-16 | Midrex Technologies, Inc. | Hot metal production from DRI with electric arc heating |
| TWI844330B (zh) * | 2022-04-22 | 2024-06-01 | 日商Jfe鋼鐵股份有限公司 | 直接還原鐵的熔解方法、固體鐵及固體鐵的製造方法、以及土木建築用資材及土木建築用資材的製造方法 |
| WO2023204063A1 (fr) * | 2022-04-22 | 2023-10-26 | Jfeスチール株式会社 | Procédé de fusion de fer à réduction directe, fer solide et procédé de fabrication de fer solide, matériau pour génie civil et construction, procédé de production de matériau pour génie civil et construction, et système de fusion de fer à réduction directe |
| JPWO2025062841A1 (fr) * | 2023-09-19 | 2025-03-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1285711A (fr) * | 1961-04-05 | 1962-02-23 | Elektrokemisk As | Procédé de fabrication de fonte dans un four électrique |
| SE371651C (sv) * | 1973-03-30 | 1976-12-06 | Asea Ab | Sett och anordning for smeltreduktion |
| US4160663A (en) * | 1978-02-21 | 1979-07-10 | Jack Hsieh | Method for the direct reduction of iron ore |
| GB8516143D0 (en) * | 1985-06-26 | 1985-07-31 | British Steel Corp | Melting of metals |
| DE3607222A1 (de) * | 1986-03-05 | 1987-09-10 | Conradty Nuernberg | Verfahren zur reduktion von eisenerz zu stahl |
| ATE139267T1 (de) * | 1990-03-13 | 1996-06-15 | Cra Services | Verfahren zum herstellen von metallen und legierungen in einem schmelzreduktionsgefäss |
| AT400245B (de) * | 1993-12-10 | 1995-11-27 | Voest Alpine Ind Anlagen | Verfahren und anlage zum herstellen einer eisenschmelze |
| NL9401103A (nl) * | 1994-07-01 | 1996-02-01 | Hoogovens Groep Bv | Werkwijze en inrichting voor het voorreduceren van ijzerverbindingen. |
| US5912916A (en) * | 1995-05-01 | 1999-06-15 | Alabama Power Company | Electric furnace with insulated electrodes and process for producing molten metals |
| AT405054B (de) * | 1997-06-18 | 1999-05-25 | Voest Alpine Ind Anlagen | Verfahren und anlage zum herstellen einer eisenschmelze unter einsatz von eisenhältigen hüttenwerksreststoffen |
| DE19744151C5 (de) * | 1997-10-07 | 2004-08-26 | Outokumpu Oyj | Verfahren zum Schmelzen von feinkörnigem, direkt reduziertem Eisen in einem Elektrolichtbogenofen |
| LU90406B1 (fr) | 1999-06-21 | 2000-12-22 | Wurth Paul Sa | Proc-d- de production de fonte liquide |
| AUPQ205799A0 (en) * | 1999-08-05 | 1999-08-26 | Technological Resources Pty Limited | A direct smelting process |
-
2002
- 2002-02-20 DE DE0001383933T patent/DE02719871T1/de active Pending
- 2002-02-20 JP JP2002568794A patent/JP4212895B2/ja not_active Expired - Fee Related
- 2002-02-20 DE DE60204221T patent/DE60204221T2/de not_active Expired - Lifetime
- 2002-02-20 RU RU2003127390/02A patent/RU2268308C2/ru not_active IP Right Cessation
- 2002-02-20 ES ES02719871T patent/ES2215498T3/es not_active Expired - Lifetime
- 2002-02-20 AU AU2002250975A patent/AU2002250975B2/en not_active Ceased
- 2002-02-20 CA CA002437254A patent/CA2437254C/fr not_active Expired - Fee Related
- 2002-02-20 US US10/468,630 patent/US7169205B2/en not_active Expired - Fee Related
- 2002-02-20 EP EP02719871A patent/EP1383933B1/fr not_active Expired - Lifetime
- 2002-02-20 BR BRPI0207370-6A patent/BR0207370B1/pt not_active IP Right Cessation
- 2002-02-20 WO PCT/EP2002/001749 patent/WO2002068700A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| JP4212895B2 (ja) | 2009-01-21 |
| US20040060389A1 (en) | 2004-04-01 |
| AU2002250975B2 (en) | 2006-11-23 |
| RU2003127390A (ru) | 2005-03-27 |
| DE60204221T2 (de) | 2006-02-02 |
| CA2437254A1 (fr) | 2002-09-06 |
| BR0207370A (pt) | 2004-06-22 |
| ES2215498T3 (es) | 2005-10-16 |
| BR0207370B1 (pt) | 2010-08-10 |
| JP2004521188A (ja) | 2004-07-15 |
| ES2215498T1 (es) | 2004-10-16 |
| EP1383933A1 (fr) | 2004-01-28 |
| DE60204221D1 (de) | 2005-06-23 |
| US7169205B2 (en) | 2007-01-30 |
| RU2268308C2 (ru) | 2006-01-20 |
| WO2002068700A1 (fr) | 2002-09-06 |
| DE02719871T1 (de) | 2004-07-15 |
| CA2437254C (fr) | 2009-06-30 |
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