EP0195897A2 - Lance refroidie par de l'eau pour souffler de l'oxygène sur un bain métallique - Google Patents

Lance refroidie par de l'eau pour souffler de l'oxygène sur un bain métallique Download PDF

Info

Publication number
EP0195897A2
EP0195897A2 EP86101134A EP86101134A EP0195897A2 EP 0195897 A2 EP0195897 A2 EP 0195897A2 EP 86101134 A EP86101134 A EP 86101134A EP 86101134 A EP86101134 A EP 86101134A EP 0195897 A2 EP0195897 A2 EP 0195897A2
Authority
EP
European Patent Office
Prior art keywords
lance
oxygen
outlet openings
melt
blowing
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
EP86101134A
Other languages
German (de)
English (en)
Other versions
EP0195897A3 (en
EP0195897B1 (fr
Inventor
Ernst Dipl.-Ing. Fritz
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.)
Kloeckner CRA Patent GmbH
Original Assignee
Kloeckner CRA Technologie GmbH
Kloeckner CRA Patent GmbH
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 Kloeckner CRA Technologie GmbH, Kloeckner CRA Patent GmbH filed Critical Kloeckner CRA Technologie GmbH
Priority to AT86101134T priority Critical patent/ATE46923T1/de
Publication of EP0195897A2 publication Critical patent/EP0195897A2/fr
Publication of EP0195897A3 publication Critical patent/EP0195897A3/de
Application granted granted Critical
Publication of EP0195897B1 publication Critical patent/EP0195897B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/305—Afterburning

Definitions

  • the invention relates to a water-cooled blowing lance with a plurality of nozzle openings for blowing oxygen or oxygen-containing gases onto a metal melt, in particular an iron melt, for afterburning the reaction gases from the melt.
  • the melt preferably consists of a carbon-containing iron bath, as is the case, for example, when raw iron is refreshed in oxygen blowing converters for the production of steel.
  • Oxygen blowing converters are increasingly operated according to the combined blowing method, as is the case among others. in Gmelin-Durer "Metallurgy of Iron", Volume 7, Springer Verlag 1984, is shown.
  • An improvement in the heat balance to increase the use of coolants, such as scrap, solid pig iron, directly reduced material, iron, manganese and chrome ore, is important for the economy of these processes.
  • a method for increasing the scrap rate in steel production is known from DE-Auslegeschrift 27 55 165 and describes the simultaneous supply of oxygen below and above the bath surface and is characterized in that between 20 and 80% of the total amount of oxygen from above by one or several gas jets directed onto the bath surface are supplied.
  • the gas jets act as free jets blowing in a gas space over a substantial part of the fresh process and suck in considerable amounts of the converter exhaust gases.
  • the oxygen is preferably blown onto the bath surface through side wall nozzles, which are installed stationary in the refractory lining of the converter and are protected against premature burning back by a hydrocarbon coating of the oxygen.
  • the afterburning can be done Increase the degree of efficiency and the transfer of heat back to the melt on average not significantly above 20%.
  • a change in the distance between the nozzle orifices and the melt is also not possible, but it always proves to be advantageous if, at high bath temperatures and low carbon contents, blowing should be harder to reduce feed wear, especially if the melt below the bath surface only uses small amounts of gas Improvement in bath movement can be supplied.
  • the lance head has at least one, preferably four, main nozzles that supply oxygen for decarburization and an equal number of secondary nozzles that supply oxygen for post-combustion solution left.
  • the main nozzles run at an angle of inclination of 14 ° to 17 ° to the lance axis and the secondary nozzles at an angle of inclination of 30 ° to 50 ° to the neighboring main nozzle axis.
  • This lance construction requires blowing with a relatively small distance between the lance head and the melt, since otherwise the oxygen jets from the secondary nozzles directly hit the lining of the converter and lead to premature wear on the feed.
  • a small lance spacing With a small lance spacing, however, the degree of afterburning of the reaction gases emerging from the bath is inevitably influenced by the behavior of the melt and in particular also by a more or less strong foam slag formation.
  • foam slag is formed, the cross-flow that is decisive for sucking the reaction gases into the oxygen jet cannot form. The heat input from the post-combustion is therefore difficult to balance and thus leads to disadvantages in the process control.
  • small lance distances result in an increased formation of lugs on the lance and thus a reduced durability of the lance head.
  • the invention has for its object to provide a lance for blowing oxygen or oxygen-containing gases, which avoids the disadvantages of the known lances with a relatively simple construction, causes an increase and optimization of the combustion of the reaction gases from the metal bath and an effective transfer of the resulting Combustion heat to the melt enables the usable heat input when freshening heights and to be able to melt higher coolant charges without endangering the refractory delivery, the lance itself and the flue gas chimney due to excessively high flue gas temperatures.
  • a blowing lance of the type mentioned at the outset has, according to the invention, a plurality of nozzle pieces connected to an oxygen supply, each with a plurality of outlet openings lying on at least two concentric circles in a distribution in the lance head each resulting in individual jets.
  • An essential feature of the invention is with a. high number of nozzle openings on a lance head to blow the oxidizing gas as separate 'individual jets onto the melt in such a way that they draw as much, ie a multiple of the amount of gas blown in, of combustible reaction gases from their surroundings on their blowing path.
  • the essential dimensions of a conventional oxygen blowing lance should be largely preserved.
  • a lance head according to the invention which can be arranged on a conventional water-cooled single-circuit blowing lance, fulfills this condition.
  • the nozzle openings are connected in groups of two to five, preferably three, to the oxygen supply via a common nozzle piece.
  • the invention allows to convert existing lances of oxygen inflation converters with the lance head according to the invention in a simple manner. By maintaining the usual lance diameter, the heat losses due to lance cooling remain in the usual range.
  • the outlet openings for the oxidizing gas are arranged in groups on two or more concentric circles on the lance head. On these circles, the distance between the nozzle groups is approximately the same.
  • the number of openings on a circle normally increases from the center, outwards, ie with increasing circle diameter.
  • the lance or its head can be such that the axes of the outlet openings are inclined with respect to the longitudinal axis of the lance and the individual jets in a plane transverse to the longitudinal axis of the lance with the distance L h within an annular surface with an inner diameter D i and an outer diameter D. a lie and the conditions: are fulfilled.
  • the lance according to the invention When the lance according to the invention is used, an optimal afterburning of the reaction gases from the melt is obtained under the aforementioned condition, combined with an effective transfer of the heat of combustion generated to the bath.
  • the lance distance to the bath surface was varied from 2 m to 5 m for a 270 t converter.
  • the blowing lance according to the invention had eighteen nozzle openings, twelve being arranged on an outer circle with a diameter of approximately 26 cm and six on an inner circle with a diameter of approximately 19 cm. It was blown with an inflation rate of 2.6 Nm 3 per minute and ton of liquid steel with a simultaneous bottom blowing rate of approx. 1 Nm 3 oxygen per minute and ton of liquid steel with occasional lime dust loading. With this mode of operation, afterburning degrees of approx. 40% could be achieved with a heat transfer of approx. 80%.
  • the efficiency of heat transfer is defined by the heat input into the melt, compared to the theoretical combustion heat from CO and H 2 to C0 2 and H 2 0 minus the unavoidable heat losses in the converter exhaust gas, which result from the increase in specific heat .
  • scrap rate increases could be compared to Reach with conventional lances of over 110 kg / t liquid steel.
  • the iron content of the slag was relatively low at approx. 11% with a carbon content of the steel melt of 0.05%.
  • the carbon burned off evenly during the main decarburization period depending on the amount of oxygen supplied.
  • the temperature accuracy and the reproducibility of the afterburning proved to be extremely reliable, so that the batches could be tapped directly, ie after a control with a sublance (temperature measurement and carbon determination), without further sampling.
  • the oxygen or the oxygen-containing gas for example air
  • the outlet openings or nozzles on the lance head at the speed of sound.
  • the diameter of the nozzle openings on the lance head is related to the distance L h between the lance head and the bath surface. It has proven to be advantageous if the ratio of the opening diameter to the lance distance L is 0.003 to 0.01.
  • Moving the lance according to the invention has proven to be advantageous for optimizing the afterburning. Even a relatively simple oscillating movement by raising and lowering the lance by, for example, + 0.15 m to + 1.5 m had a favorable influence on the degree of afterburning and the retransfer of the heat of combustion to the melt. Even rotating the lance at a relatively high distance from the bath surface can be even more effective than lifting and lowering. A combination of both movements is also an advantage.
  • a prerequisite for the lance rotation movement is a multiple swivel joint at the lance inlet for the media supply. A moderate lance rotation itself can be achieved using friction rollers arranged above the chimney inlet. This lance movement makes it possible to increase the average post-combustion by 5 to 10 percentage points per batch.
  • nozzle openings in the central region of the lance head, which are supplied by a separate feed line and, if necessary, intermediate pieces, for inflating solids such as lime, ore and in particular carbon-containing fuels.
  • Milled fuels e.g. Coal and coke blown onto the bath to further increase the heat input into the melt. Since the lance according to the invention improves the post-combustion of the resulting reaction gases, the thermal efficiency of the supplied fuels also increases. This increase can be supported if ground coolants such as ore, lime and limestone are added to the fuel, which are thus already heated in the gas space above the melt.
  • the lance according to the invention consists of three concentric tubes 1, 2, 3 with a welded-on lance head 4, for example made of high-purity die-forged copper. Oxygen flows through the inner tube 1 with a clear diameter of 250 mm to the lance head 4.
  • the outer tube 3 has an outer diameter of 410 mm and the intermediate tube 2 of 340 mm. Cooling water is fed to the lance head in the annular space between tubes 1 and 2, and returned in the annular space between tubes 2 and 3.
  • the lance head 4 has six tubular nozzle pieces 5 with three channel-shaped outlet openings 6 extending from the tubular jacket surface.
  • the oxygen consequently flows from the oxygen tube 1 via the nozzle pieces 5 to the outlet openings 6 and emerges from the nozzle head 4 in the form of several individual jets.
  • the nozzle pieces 5 are arranged inclined with respect to the longitudinal axis 7 of the lance.
  • the angle of inclination 8 depends on the converter shape and size and is 10 ° to 25 0 , in this case 20 °.
  • angles of inclination 9 and 10 of the axes of the outlet openings 6 of a nozzle piece 5 are different, while the angle of inclination 10 coincides with the angle of inclination 8.
  • the angle of inclination 9 of the outlet openings 6, the gas jets of which hit the bath surface 24 near the inner diameter 22 of the annular surface 21, is normally approximately 10 ° smaller than the angle of inclination 10 of the outer outlet openings 6 and is approximately 5 ° to 20 °.
  • the nozzle pieces 5 each have three outlet openings 6, one outlet opening entirely, the second partially and the third one not being visible in the sectional drawing of FIG. 1.
  • the gas jets of the outlet openings with the angle of inclination 9 hit the bath surface 24 near the inner diameter 22 in the circular ring surface 21.
  • the six contact surfaces 20 of these gas jets lie approximately at the same distance from one another on a circle with the diameter 25.
  • These twelve contact surfaces 20 of the outer gas jets also lie approximately on a circle, and the distance between the individual contact surfaces 20 is also the same . Accordingly, the two outlet openings 6 of a nozzle piece 5 for the outer gas jets are also inclined in this direction.
  • the angle of inclination of these two outlet openings to one another lies in relation to the lance axis between 5 ° and 20 °.
  • the lance head 4 has a total of six nozzle pieces 5, each with three outlet openings 6.
  • the gas jets, each blowing separately onto the bath surface 24, lie with their contact surfaces 20 within the circular ring surface 21 at approximately the same distance from one another on two circles with a diameter of 25 or 26
  • the periphery of the approximately circular contact surfaces 20 touches the diameter 22 of the circular ring surface 21 and accordingly the periphery of the contact surfaces 20 touches the outer diameter 23 of the circular ring surface 21.
  • the lance according to the invention has proven itself in the steel refining in Sauerstoffblaskonvertern and out with respect to the afterburning of the reaction gases from the melt and the transfer of resulting from combustion heat to the ⁇ Bad to surprisingly good results.
  • the degree of afterburning could surprisingly be tripled with the lance according to the invention, namely increased from about 13% to over 40%.
  • the transfer of combustion heat with an efficiency of over 80% was also unusually high.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Charging Or Discharging (AREA)
EP86101134A 1985-03-19 1986-01-29 Lance refroidie par de l'eau pour souffler de l'oxygène sur un bain métallique Expired EP0195897B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86101134T ATE46923T1 (de) 1985-03-19 1986-01-29 Wassergekuehlte blaslanze zum aufblasen von sauerstoff auf eine metallschmelze.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3509795 1985-03-19
DE3509795A DE3509795C1 (de) 1985-03-19 1985-03-19 Wassergekuehlte Blaslanze zum Aufblasen von Sauerstoff auf eine Metallschmelze

Publications (3)

Publication Number Publication Date
EP0195897A2 true EP0195897A2 (fr) 1986-10-01
EP0195897A3 EP0195897A3 (en) 1987-05-27
EP0195897B1 EP0195897B1 (fr) 1989-10-04

Family

ID=6265624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86101134A Expired EP0195897B1 (fr) 1985-03-19 1986-01-29 Lance refroidie par de l'eau pour souffler de l'oxygène sur un bain métallique

Country Status (6)

Country Link
US (1) US4702462A (fr)
EP (1) EP0195897B1 (fr)
JP (1) JPS61213312A (fr)
AT (1) ATE46923T1 (fr)
AU (1) AU571125B2 (fr)
DE (2) DE3509795C1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996023082A1 (fr) * 1995-01-25 1996-08-01 Alexandr Leonidovich Kuzmin Embout pour tuyere de conversion de l'oxygene
CN101526309B (zh) * 2008-03-03 2011-04-20 云南云维股份有限公司 一种密闭式电石炉加料嘴及制造工艺

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU86321A1 (fr) * 1986-02-25 1987-09-10 Arbed Lance de soufflage d'oxygene
JPH0595905U (ja) * 1992-06-03 1993-12-27 富士車輌株式会社 ゴミ投入装置
DE19529932C1 (de) * 1995-08-02 1997-01-16 Mannesmann Ag Lanzenkopf einer Blaslanze zur Behandlung von Schmelzen
US6125133A (en) * 1997-03-18 2000-09-26 Praxair, Inc. Lance/burner for molten metal furnace
US6217824B1 (en) 1999-05-20 2001-04-17 Berry Metal Company Combined forged and cast lance tip assembly
GB9922543D0 (en) * 1999-09-24 1999-11-24 Rhs Paneltech Ltd Wire feed unit
BE1013686A3 (fr) * 2000-09-15 2002-06-04 Thomas Jacques Nez de lance de soufflage.
FR2860243B1 (fr) * 2003-09-30 2006-02-03 Air Liquide Buse multi-jets et lance multi-jets la comportant
US7799735B2 (en) * 2005-06-01 2010-09-21 Ronald Segall Chemically modified melamine resin for use in sublimation dye imaging
US20070246869A1 (en) * 2006-04-21 2007-10-25 Berry Metal Company Metal making lance tip assembly
EP1932927B1 (fr) * 2006-12-15 2012-08-01 Technological Resources Pty. Ltd. Appareil d'injection d'un gaz dans une cuve
DE102010047969A1 (de) * 2010-03-31 2011-10-06 Sms Siemag Aktiengesellschaft Vorrichtung zur Einblasung von Gas in ein metallurgisches Gefäß
US9016094B2 (en) * 2013-01-16 2015-04-28 Guardian Industries Corp. Water cooled oxygen lance for use in a float glass furnace and/or float glass furnace using the same
JP6292019B2 (ja) * 2014-05-14 2018-03-14 新日鐵住金株式会社 溶融金属精錬用上吹きランス

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU78906A1 (fr) * 1978-01-19 1979-09-06 Arbed Procede et dispositif pour l'affinage d'un bain de metal
DE3134244A1 (de) * 1980-10-13 1982-07-22 ARBED S.A., 2930 Luxembourg "sauerstoff-blaslanze"
EP0086694A1 (fr) * 1982-02-10 1983-08-24 Institut De Recherches De La Siderurgie Francaise (Irsid) Lance d'injection de gaz pour convertisseur métallurgique
EP0081448B1 (fr) * 1981-12-04 1986-09-10 Arbed S.A. Procédé et dispositif pour l'affinage d'un bain de métal contenant des matières refroidissantes solides

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU472980A1 (ru) * 1973-08-03 1975-06-05 Уральский политехнический институт им.С.М.Кирова ГАЗО-КИСЛОРОДНАЯ ФУРМА3 П Т Б^•^-^:": ""^-'Ш'Ш1Изобретение относитс к области металлургии, в частности может быть исиользовано при выплавке стали.Известна газо-кислородна фурма дл продувки расплавов с предварительным смешением газов (топливо и кислород), состо ща из коаксиально расположенных труб и головки с соплами с центральным подводом охлаждающей воды. Однако эта фурма не снабжена устройством, предотвращающим проскок пламени от сопел к смесительному узлу. Горение |смеси газа и кислорода внутри межтрубного подвод щего тракта приводит к резкому уменьшению пропускной способности фурмы по дутью и выходу ее из стро .В предложенной газо-кислородной фурме, с целью предотвращени проскока пламени из продувочных сопел в топливно-кислородный тракт, последний в нижней части разделен кольцевой водоохлаждаемой перегородкой с отверсти ми (кольцевую перегородку изготовл ют металлической, папример из меди), под перегородкой размещен кольцевой газовый коллектор, сообщающийс с продувочными соплами.На фиг. 1 изображена газо-кислородна |)урма в разрезе; на фиг. 2 — то же, разрез по А—А на фиг. 1.Описываема фурма состоит из трех коак- сиальпо расположенных труб, по которым, каки в обычной кислородной фурме, в головку I подаетс , а из нее отводитс вода, а также подаетс в нее продувочный газ. Фурма имеет центрально-осевой подвод воды 2 к головке I 5 на охлаждение, каналы 3 дл отвода воды из цеитральной полости головки в межтрубную полость 4 фурмы. Каналы 3 расиоложены равномерно между соплами 5. В хвостовой части фурмы, как и в известных фурмах, имеютс 10 патрубки б и 7 соответственно дл иодачи в фурму и отвода из нее воды дл охлаждени , а также иатрубки 8 и 9 соответственно дл ввода в фурму кислорода и топлива (газа). Кроме того, в хвостовой части фурмы на15 уровне иатрубка 9 располагаетс смесительное кольцо 10, которое перекрывает межтрубный зазор, образованный центральной (осевой) трубой 11 и разделительной трубой 12. Смесительное кольцо 10 герметично сочлен етс 20 (например, с помощью сварки), привариваетс или с одной из этих труб или с обеими. В первом случае стыковка по окружности с трубой имеет уплотнение 13. Смесительное кольцо 10 содержит в себе р д вертикальных отвер-25 стий — смесительных сопел 14, через которые из верхней части 15 межтрубного зазора, перекрытого кольцом 10, кислород проходит в топливно-кислородный тракт 16. Смесительные сопла 14 в нижней части сочленены с отвер-30 сти ми 17, служащими дл подачи газообраз-
US4190238A (en) * 1978-05-11 1980-02-26 Stahlwerke Peine-Salzgitter Ag Lance head for a fining lance
SU821842A1 (ru) * 1979-06-27 1981-04-15 Институт Газа Ан Украинской Сср Газокислородна горелка
FR2496699B1 (fr) * 1980-12-22 1985-06-21 Siderurgie Fse Inst Rech Lance de soufflage de gaz oxydant, notamment d'oxygene, pour le traitement des metaux en fusion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU78906A1 (fr) * 1978-01-19 1979-09-06 Arbed Procede et dispositif pour l'affinage d'un bain de metal
DE3134244A1 (de) * 1980-10-13 1982-07-22 ARBED S.A., 2930 Luxembourg "sauerstoff-blaslanze"
EP0081448B1 (fr) * 1981-12-04 1986-09-10 Arbed S.A. Procédé et dispositif pour l'affinage d'un bain de métal contenant des matières refroidissantes solides
EP0086694A1 (fr) * 1982-02-10 1983-08-24 Institut De Recherches De La Siderurgie Francaise (Irsid) Lance d'injection de gaz pour convertisseur métallurgique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996023082A1 (fr) * 1995-01-25 1996-08-01 Alexandr Leonidovich Kuzmin Embout pour tuyere de conversion de l'oxygene
CN101526309B (zh) * 2008-03-03 2011-04-20 云南云维股份有限公司 一种密闭式电石炉加料嘴及制造工艺

Also Published As

Publication number Publication date
US4702462A (en) 1987-10-27
DE3666050D1 (en) 1989-11-09
JPS61213312A (ja) 1986-09-22
AU571125B2 (en) 1988-03-31
EP0195897A3 (en) 1987-05-27
AU5385686A (en) 1986-09-25
ATE46923T1 (de) 1989-10-15
EP0195897B1 (fr) 1989-10-04
JPS6311405B2 (fr) 1988-03-14
DE3509795C1 (de) 1986-06-05

Similar Documents

Publication Publication Date Title
EP0195897B1 (fr) Lance refroidie par de l'eau pour souffler de l'oxygène sur un bain métallique
EP1304391B1 (fr) Procede de production d'une masse metallique en fusion en utilisant une lance multifunction
EP0257450B1 (fr) Procédé pour augmenter l'énergie alimentant les fours à arc électrique
EP0030360B2 (fr) Procédé de fabrication d'acier
DE4234974C2 (de) Verfahren zur Verstärkung der Stoffumsätze in metallurgischen Reaktionsgefäßen
DE4343957A1 (de) Konverterverfahren zur Produktion von Eisen
DE1458306B2 (de) Vorrichtung und verfahren zum raffinieren von fluessigen metallen
EP0236801A2 (fr) Procédé pour la fabrication de fer
DE4042176C2 (de) Verfahren zur Reduktion von Metalloxiden im schmelzflüssigen Zustand
DE4234973C1 (de) Verfahren zum Schutz der feuerfesten Ausmauerung im Gasraum von metallurgischen Reaktionsgefäßen
DE2755165B2 (de) Verfahren zur Erhöhung des Schrottsatzes bei der Stahlerzeugung
DE2816543C2 (de) Verfahren zur Stahlerzeugung
EP0680592B1 (fr) Procede et dispositif permettant de faire fondre des matieres siderurgiques dans un cubilot chauffe au coke
DE4238020C2 (de) Verfahren für den Betrieb einer Multimediendüse und das Düsensystem
DE4205657A1 (de) Konverter
EP0171385B1 (fr) Procédé pour la préparation de carbure de calcium et four à cuve pour la mise en oeuvre de ce procédé
DD215803A5 (de) Verfahren zur durchfuehrung von metallurgischen oder chemischen prozessen und niederschachtofen
DE3607777C2 (fr)
EP0030344B2 (fr) Procédé pour perfectionner l'utilisation de la chaleur lors de la production de l'acier à partir de matières de fer solide
DE3008145A1 (de) Stahlerzeugungsverfahren
EP0089701A1 (fr) Procédé de réduction directe de matière contenant de l'oxyde de fer au four tubulaire rotatif
EP1613782A2 (fr) Procede pour ameliorer l'alimentation en energie dans un tas de ferrailles
DE2209384A1 (de) Verfahren und vorrichtung zum alkalischen oxidierenden roesten von chromerz
DE607369C (de) Dueseneinsatzkoerper zur Einfuehrung erhitzter Oberluft in Kupol- und Hochoefen
AT407257B (de) Verfahren zum herstellen einer metallschmelze

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

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT DE FR GB IT

ITCL It: translation for ep claims filed

Representative=s name: BARZANO' E ZANARDO ROMA S.P.A.

EL Fr: translation of claims filed
PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT DE FR GB IT

17P Request for examination filed

Effective date: 19870715

17Q First examination report despatched

Effective date: 19890116

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE FR GB IT

REF Corresponds to:

Ref document number: 46923

Country of ref document: AT

Date of ref document: 19891015

Kind code of ref document: T

ITF It: translation for a ep patent filed

Owner name: BARZANO' E ZANARDO ROMA S.P.A.

REF Corresponds to:

Ref document number: 3666050

Country of ref document: DE

Date of ref document: 19891109

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: KLOECKNER CRA PATENT GMBH

ET Fr: translation filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: 732

R20 Corrections of a patent specification

Effective date: 19900112

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
ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20010116

Year of fee payment: 16

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020129

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20050110

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20050126

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20050127

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20050129

Year of fee payment: 20

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20060128