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
Links
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.
Landscapes
- 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)
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
LU90735 | 2001-02-23 | ||
LU90735A LU90735B1 (fr) | 2001-02-23 | 2001-02-23 | Proc-d- de production de fonte liquide |
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 (es) |
EP (1) | EP1383933B1 (es) |
JP (1) | JP4212895B2 (es) |
AU (1) | AU2002250975B2 (es) |
BR (1) | BR0207370B1 (es) |
CA (1) | CA2437254C (es) |
DE (2) | DE60204221T2 (es) |
ES (1) | ES2215498T3 (es) |
RU (1) | RU2268308C2 (es) |
WO (1) | WO2002068700A1 (es) |
Families Citing this family (12)
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 |
JP5166804B2 (ja) * | 2007-09-19 | 2013-03-21 | 株式会社神戸製鋼所 | 溶鉄製造方法 |
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 |
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 |
CN111263821B (zh) * | 2017-10-23 | 2022-01-11 | 日本制铁株式会社 | 电炉及含氧化铁铁原料的熔解及还原方法 |
RU2734215C1 (ru) * | 2020-04-16 | 2020-10-13 | Автономная некоммерческая организация «Научно-исследовательский институт проблем экологии» | Способ выплавки чугуна в доменной печи |
WO2023204069A1 (ja) * | 2022-04-22 | 2023-10-26 | Jfeスチール株式会社 | 直接還元鉄の溶解方法、固体鉄および固体鉄の製造方法ならびに土木建築用資材および土木建築用資材の製造方法 |
WO2023204063A1 (ja) * | 2022-04-22 | 2023-10-26 | Jfeスチール株式会社 | 直接還元鉄の溶解方法、固体鉄および固体鉄の製造方法、土木建築用資材および土木建築用資材の製造方法ならびに直接還元鉄の溶解システム |
Family Cites Families (9)
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 | 1976-11-25 | Asea Ab | Sett och anordning for smeltreduktion |
GB8516143D0 (en) * | 1985-06-26 | 1985-07-31 | British Steel Corp | Melting of metals |
AT400245B (de) * | 1993-12-10 | 1995-11-27 | Voest Alpine Ind Anlagen | Verfahren und anlage zum herstellen einer eisenschmelze |
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 BR BRPI0207370-6A patent/BR0207370B1/pt not_active IP Right Cessation
- 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 CA CA002437254A patent/CA2437254C/fr not_active Expired - Fee Related
- 2002-02-20 EP EP02719871A patent/EP1383933B1/fr not_active Expired - Lifetime
- 2002-02-20 ES ES02719871T patent/ES2215498T3/es not_active Expired - Lifetime
- 2002-02-20 US US10/468,630 patent/US7169205B2/en not_active Expired - Fee Related
- 2002-02-20 DE DE0001383933T patent/DE02719871T1/de active Pending
- 2002-02-20 AU AU2002250975A patent/AU2002250975B2/en not_active Ceased
- 2002-02-20 WO PCT/EP2002/001749 patent/WO2002068700A1/fr active IP Right Grant
- 2002-02-20 JP JP2002568794A patent/JP4212895B2/ja not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP4212895B2 (ja) | 2009-01-21 |
DE02719871T1 (de) | 2004-07-15 |
US7169205B2 (en) | 2007-01-30 |
RU2003127390A (ru) | 2005-03-27 |
RU2268308C2 (ru) | 2006-01-20 |
EP1383933A1 (fr) | 2004-01-28 |
BR0207370A (pt) | 2004-06-22 |
ES2215498T3 (es) | 2005-10-16 |
WO2002068700A1 (fr) | 2002-09-06 |
BR0207370B1 (pt) | 2010-08-10 |
CA2437254A1 (fr) | 2002-09-06 |
JP2004521188A (ja) | 2004-07-15 |
ES2215498T1 (es) | 2004-10-16 |
DE60204221T2 (de) | 2006-02-02 |
CA2437254C (fr) | 2009-06-30 |
US20040060389A1 (en) | 2004-04-01 |
AU2002250975B2 (en) | 2006-11-23 |
DE60204221D1 (de) | 2005-06-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4790124B2 (ja) | 溶融鉄を製造する方法 | |
RU2034040C1 (ru) | Способ производства стали | |
EP1383933B1 (fr) | Procede de production de fonte liquide dans un four electrique | |
EP2053137A1 (fr) | Valorisation de résidus contenant du cuivre et d'autres métaux de valeur | |
EP1034312B1 (fr) | Installation de reduction d'oxydes de fer et de fusion du fer | |
JP5552754B2 (ja) | アーク炉の操業方法 | |
RU97118334A (ru) | Установка и способ для получения расплавов железа | |
FR2627578A1 (fr) | Four a fusion et procede pour introduire dans celui-ci le materiau a traiter | |
EP1187942B1 (fr) | Procede de production de fonte liquide | |
CN105940120A (zh) | 在电弧炉中制钢的方法和电弧炉 | |
JP3539263B2 (ja) | 金属含有物からの還元金属の製造方法および還元金属製造用移動型炉床炉 | |
EP1797207B1 (fr) | Traitement de boues d'usines sidérurgiques dans un four à étages | |
JP3721154B2 (ja) | クロム含有溶湯の精錬方法 | |
JP4762420B2 (ja) | ロータリーキルンを用いた酸化鉄の溶融還元方法 | |
JP4341139B2 (ja) | 金属含有物からの還元金属の製造方法 | |
EP4121574B1 (fr) | Procédé de récupération dans des ferro-alliages des métaux contenus dans des catalyseurs usés | |
JP2014510193A (ja) | 溶鉄及び鋼を製造する方法及び装置 | |
EP1154825B1 (fr) | Procede d'optimisation du fonctionnement d'un haut four | |
EP0921200A1 (fr) | Procédé de réduction d'oxydes de fer et de fusion du fer et installation à cet effet | |
JP2002285225A (ja) | 使用済み自動車又は使用済み家電機器のリサイクル処理方法 | |
BE1011186A3 (fr) | Procede de production de fonte liquide a partir d'eponge de fer et installation pour sa mise en oeuvre. | |
JP2000008115A (ja) | 冷鉄源の溶解方法 | |
FR3127848A1 (fr) | Recyclage de résidus métallurgiques | |
JP2004204293A (ja) | 金属含有物からの還元金属の製造方法 | |
BE509514A (es) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20030904 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
|
GBC | Gb: translation of claims filed (gb section 78(7)/1977) | ||
DET | De: translation of patent claims | ||
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE ES FR IT |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D Free format text: LANGUAGE OF EP DOCUMENT: FRENCH |
|
REF | Corresponds to: |
Ref document number: 60204221 Country of ref document: DE Date of ref document: 20050623 Kind code of ref document: P |
|
TCAT | At: translation of patent claims filed | ||
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2215498 Country of ref document: ES Kind code of ref document: T3 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20060221 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20120225 Year of fee payment: 11 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20130125 Year of fee payment: 12 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20140114 Year of fee payment: 13 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20150327 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20140221 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20151030 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20150302 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20140220 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20180115 Year of fee payment: 17 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 60204221 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20190903 |