EP0110806B1 - Système de réglage de l'alimentation en matières solides d'une lance de soufflage - Google Patents

Système de réglage de l'alimentation en matières solides d'une lance de soufflage Download PDF

Info

Publication number: EP0110806B1
Authority: EP; European Patent Office
Prior art keywords: gas; carbon; metering; containing material; lance
Prior art date: 1982-10-27
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

Application number

EP83630175A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP0110806A1 (fr

Inventor

Jean Peckels

Antoine Schaaf

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.)

Arcelor Luxembourg SA

Original Assignee

Arbed SA

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.)

1982-10-27

Filing date

1983-10-20

Publication date

1988-02-03

1983-10-20 Application filed by Arbed SA filed Critical Arbed SA

1983-10-20 Priority to AT83630175T priority Critical patent/ATE32351T1/de

1984-06-13 Publication of EP0110806A1 publication Critical patent/EP0110806A1/fr

1988-02-03 Application granted granted Critical

1988-02-03 Publication of EP0110806B1 publication Critical patent/EP0110806B1/fr

Status Expired legal-status Critical Current

Links

238000007664 blowing Methods 0.000 title claims abstract description 13
230000001105 regulatory effect Effects 0.000 title claims description 9
239000011343 solid material Substances 0.000 title claims description 7
239000007789 gas Substances 0.000 claims abstract description 38
239000000463 material Substances 0.000 claims abstract description 17
238000000034 method Methods 0.000 claims abstract description 12
239000002184 metal Substances 0.000 claims abstract description 8
229910052751 metal Inorganic materials 0.000 claims abstract description 8
230000008569 process Effects 0.000 claims abstract description 8
239000012159 carrier gas Substances 0.000 claims abstract description 6
IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
229910052799 carbon Inorganic materials 0.000 claims description 18
229910052757 nitrogen Inorganic materials 0.000 claims description 11
XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
238000007670 refining Methods 0.000 claims description 7
229910052786 argon Inorganic materials 0.000 claims description 5
230000001276 controlling effect Effects 0.000 claims description 5
238000009434 installation Methods 0.000 claims description 4
230000009467 reduction Effects 0.000 claims description 4
229910001018 Cast iron Inorganic materials 0.000 claims description 3
239000000126 substance Substances 0.000 claims description 2
239000000725 suspension Substances 0.000 claims 4
230000002000 scavenging effect Effects 0.000 claims 3
239000003575 carbonaceous material Substances 0.000 abstract description 17
239000007787 solid Substances 0.000 abstract description 5
238000011010 flushing procedure Methods 0.000 abstract 1
QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
239000001301 oxygen Substances 0.000 description 8
229910052760 oxygen Inorganic materials 0.000 description 8
230000001413 cellular effect Effects 0.000 description 3
238000002485 combustion reaction Methods 0.000 description 3
238000001816 cooling Methods 0.000 description 3
238000010408 sweeping Methods 0.000 description 3
238000013461 design Methods 0.000 description 2
230000001066 destructive effect Effects 0.000 description 2
238000001514 detection method Methods 0.000 description 2
239000012530 fluid Substances 0.000 description 2
239000000446 fuel Substances 0.000 description 2
239000008187 granular material Substances 0.000 description 2
230000007935 neutral effect Effects 0.000 description 2
239000007800 oxidant agent Substances 0.000 description 2
230000002028 premature Effects 0.000 description 2
238000010926 purge Methods 0.000 description 2
239000005997 Calcium carbide Substances 0.000 description 1
229910000831 Steel Inorganic materials 0.000 description 1
238000010521 absorption reaction Methods 0.000 description 1
238000005054 agglomeration Methods 0.000 description 1
230000002776 aggregation Effects 0.000 description 1
RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
239000003830 anthracite Substances 0.000 description 1
238000013459 approach Methods 0.000 description 1
238000006243 chemical reaction Methods 0.000 description 1
239000000571 coke Substances 0.000 description 1
150000001875 compounds Chemical class 0.000 description 1
238000010586 diagram Methods 0.000 description 1
238000004090 dissolution Methods 0.000 description 1
239000000428 dust Substances 0.000 description 1
230000000694 effects Effects 0.000 description 1
238000002474 experimental method Methods 0.000 description 1
238000005243 fluidization Methods 0.000 description 1
239000007788 liquid Substances 0.000 description 1
150000001247 metal acetylides Chemical class 0.000 description 1
239000000203 mixture Substances 0.000 description 1
238000012544 monitoring process Methods 0.000 description 1
230000003647 oxidation Effects 0.000 description 1
238000007254 oxidation reaction Methods 0.000 description 1
230000001590 oxidative effect Effects 0.000 description 1
230000001681 protective effect Effects 0.000 description 1
238000004064 recycling Methods 0.000 description 1
238000000926 separation method Methods 0.000 description 1
239000010959 steel Substances 0.000 description 1
CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1

Images

Classifications

- 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
- 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

Definitions

the present invention relates to a device and a method for adjusting the supply of solids to a lance used to supply a metal bath, in particular a cast iron bath in the process of refining.
the invention describes in particular a device and a method, suitable for the introduction of granulated combustible material using neutral carrier gases into the metal being refined in the context of the LD, LD-AC or LBE processes.
patent application FR 2 459 835 provides for blowing calcium carbide on the surface of the bath, and this by using refining oxygen as the vehicle for the carbide. It turns out that the carbide carried by the oxygen does not oxidize in the jet, which may a priori surprise.
carbides are compounds which are obtained by reactions consuming large amounts of energy which should exclude such a process at a time when energy is expensive.
the constraint of recarburizing the bath in reduced time is also reinforced if nitrogen is chosen as the carrier gas for reasons of cost price.
the nitrogen jet strikes the surface of the metal bath in the immediate vicinity of the refining oxygen.
the degree of dissolution of nitrogen in liquid steel increases with temperature.
the object of the invention is to provide a device and a method capable of rapidly injecting a high quantity of granulated combustible material into a metal bath from above.
FIG. 1 shows a possible embodiment of the system for adjusting the supply of the lance.
the insufflation lance 1 which can be a multiflux lance used to supply the bath jointly with oxygen and granulated material, or else a monoflux lance used to inject only granulated material into the bath. In the latter case, the refining oxygen and possibly the post-combustion oxygen is supplied by a separate lance.
the lance 1 is mounted on a quick fixing system 2, integral with a carriage or any other mobile system, not shown, used to approach the lance at the desired distance from the surface of the bath.
the fastening system is connected to a set 5 of rigid tubes 3 and articulations 4, known as shears as well as to a safety device 6 which detects possible leaks in the body of the lance 1.
the leak detection is particularly important in multiflow lances which jointly supply the fuel which is normally abrasive and the oxidizer and can for example be carried out using a sheath filled with a fluid, which surrounds the duct of carbonaceous material the lance and a pressure sensor which monitors the fluid pressure. In the event of a rupture, the sensor registers a pressure variation which it transmits to the safety device 6 which stops the blowing operation. It is also possible to design a cooling circuit so as to achieve at the same time a separation between the fuel and oxidizer conduits. In this case, monitoring of the cooling circuit pressure also allows leak detection.
the shears 5 can be connected at will to the circuit 7 supplying carbonaceous material or to the circuit 8 supplying sweep gas by acting on the electromagnetic valves 9 respectively 10.
the circuit 8 is used to send a determined flow rate of argon from the source 30 or nitrogen from the source 31 to the lance 1 by opening / closing the valves 21 resp. 22 and by adequately controlling the flow regulator 11.
the regulator 11 essentially consists of a pressure sensor 19, a pressure variation sensor 18 and a temperature sensor 20 connected respectively to converters 17 , 16 and 15 which transform the signals picked up into electrical signals which can be processed by the computer 14.
the latter determines according to the operating mode of the crucible or the state of blockage of the conduits the required flow rate which it transmits to the regulating valve 12 via the amplifier 13. Note that for reasons of clarity of the figure the computer has been drawn in several different places (provided with the references 14a and 14b).
valves 24 at 26 are located between valve 22 and the nitrogen source 31 as well as a pressure regulator 25 which prevents the source 31 from applying excessive pressures to the purge gas supply circuit 8.
a one-way valve 53 avoids any feedback from the carbonaceous material supply circuit 7 to the purge gas supply circuit 8.
the circuit 7 supplying carbonaceous material is only connected to the nitrogen source 31 and essentially comprises a flow regulator 11a as well as a blast airlock with a cellular metering device 40.
the airlock allows the flow rate of the mixture to be adjusted continuously. to be introduced and this by simply acting on the speed of rotation of the wheel of the cellular metering device 48.
the flow rate of carrier gas passing through the blowing lance can thus be modified independently of the quantity of solid material.
the airlock includes a conduit 41 leading to the pressurization system of the carbonaceous material reservoir 47, as well as conduits 42 to 46 connected to the fluidization system of the carbonaceous material.
a sensor 50 monitors the pressure in the conduits downstream of the airlock 40 and acts via the converter 49 and the computer 14b on the speed of rotation of the rove of the cellular metering device 48.
the flow regulator 11 a of the supplier circuit carbonaceous material 7 is of a design close to that of the regulator 11 controlling the flow of sweeping gas and the elements fulfilling equivalent functions are identified by the same numbers increased by the letter a. Note that the pressure prevailing in the duct is identified using the sensor 19a mounted on the pressure regulator 25a and the valves 24a and 26a and practically indicates the pressure of the nitrogen source 31.
the installation also includes several manometers 51 as well as electromagnetic valves 52.
the valve 9 is open while the valve 10 is closed.
the carrier gas flow rate as well as that of carbonaceous material are adjusted to the maximum values compatible with the capacities of the installation (source, conduits, airlock, etc.) and metallurgical requirements (capacity for absorbing carbon by the bath, etc.).
the pressure detected by the sensor 50 increases and the computer 14 commands a reduction in the speed of rotation of the wheel of the metering device 48 so as to reduce the load of solid material in the gas flow. If the pressure then drops, the speed of rotation of the wheel 48 is again increased.
the computer 14 controls the stopping of the circuit 7, the closing of the valve 9 and the opening of the valve 10. Then the regulating valve 12 is opened to the maximum so as to send, depending on the opening or closing of the valves 21 and 22, nitrogen or argon under high pressure on the shears 5 and the lance 1. If the unblocking desired operation takes place, the pressure measured by the sensor 50 drops and recarburation can resume.
valve 9 is closed and the valve 10 open and allows a small flow of gas (nitrogen, preferably argon) to flow through the shears 5 and the lance 1 so as to prevent blockage of the conduits due has an agglomeration of carbonaceous material deposited in the tubes or a blockage of the lance head caused by projections.
gas nitrogen, preferably argon

Landscapes

Chemical & Material Sciences (AREA)
Engineering & Computer Science (AREA)
Manufacturing & Machinery (AREA)
Materials Engineering (AREA)
Metallurgy (AREA)
Organic Chemistry (AREA)
Furnace Charging Or Discharging (AREA)
Carbon Steel Or Casting Steel Manufacturing (AREA)
Treatment Of Steel In Its Molten State (AREA)
Discharge Heating (AREA)
Luminescent Compositions (AREA)
Crystals, And After-Treatments Of Crystals (AREA)
Color Printing (AREA)
Endoscopes (AREA)
Air Transport Of Granular Materials (AREA)
Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Coating Apparatus (AREA)
Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Inorganic Insulating Materials (AREA)
Control And Other Processes For Unpacking Of Materials (AREA)
Physical Vapour Deposition (AREA)
Glass Compositions (AREA)

EP83630175A 1982-10-27 1983-10-20 Système de réglage de l'alimentation en matières solides d'une lance de soufflage Expired EP0110806B1 (fr)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
AT83630175T ATE32351T1 (de)	1982-10-27	1983-10-20	Regelungssystem zur versorgung einer blaslanze mit festen stoffen.

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
LU84444		1982-10-27
LU84444A LU84444A1 (fr)	1982-10-27	1982-10-27	Systeme de reglage de l'alimentation en matieres solides d'une lance de soufflage

Publications (2)

Publication Number	Publication Date
EP0110806A1 EP0110806A1 (fr)	1984-06-13
EP0110806B1 true EP0110806B1 (fr)	1988-02-03

Family

ID=19729972

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP83630175A Expired EP0110806B1 (fr)	1982-10-27	1983-10-20	Système de réglage de l'alimentation en matières solides d'une lance de soufflage

Country Status (16)

Country	Link
US (1)	US4519587A (pt)
EP (1)	EP0110806B1 (pt)
JP (1)	JPS59133315A (pt)
KR (1)	KR840006371A (pt)
AT (1)	ATE32351T1 (pt)
AU (2)	AU558520B2 (pt)
BR (1)	BR8305162A (pt)
CA (1)	CA1210833A (pt)
DE (1)	DE3375583D1 (pt)
ES (1)	ES526779A0 (pt)
FI (1)	FI73463C (pt)
IN (1)	IN160933B (pt)
LU (1)	LU84444A1 (pt)
NO (1)	NO833910L (pt)
PT (1)	PT77554B (pt)
ZA (1)	ZA837907B (pt)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
LU85363A1 (fr) *	1984-05-15	1986-01-29	Arbed	Dispositif d'adaptation pour tuyere d'acceleration de particules solides
US4747584A (en) *	1987-05-19	1988-05-31	Inland Steel Company	Apparatus for injecting alloying ingredient into molten metal stream
US6976489B2 (en) *	2000-06-30	2005-12-20	Northgate Technologies, Inc.	Method and apparatus for humidification and warming of air
AUPR817201A0 (en) *	2001-10-09	2001-11-01	Technological Resources Pty Limited	Supplying solid feed materials for a direct smelting process
US6835229B2 (en)	2002-01-22	2004-12-28	Isg Technologies Inc.	Method and apparatus for clearing a powder accumulation in a powder delivery tube
MXPA05010927A (es) *	2004-10-12	2006-04-24	Tech Resources Pty Ltd	Suministro de materiales de alimentacion solidos para proceso de fusion directa.
US8211052B1 (en)	2006-07-13	2012-07-03	Lexion Medical Llc	Charged hydrator
US8496412B2 (en) *	2006-12-15	2013-07-30	General Electric Company	System and method for eliminating process gas leak in a solids delivery system
EP2422134A1 (en) *	2009-04-24	2012-02-29	FLSmidth A/S	A burner
JP5585517B2 (ja) *	2011-04-07	2014-09-10	新日鐵住金株式会社	溶鋼に粉体を吹込む精錬設備、粉体吹込みタンクのリーク検知方法及びプログラム
JP6019565B2 (ja) *	2011-11-16	2016-11-02	株式会社Ihi	酸素燃焼ボイラの微粉燃料供給方法及び酸素燃焼ボイラシステム
CN105264320B (zh) *	2013-05-06	2017-06-30	技术资源有限公司	固体注射喷枪
CN112981036A (zh) *	2019-12-17	2021-06-18	新疆八一钢铁股份有限公司	一种快速处理转炉加料口堵塞的方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE1608619B1 (de) *	1959-04-29	1969-09-11	Polysius Ag	Vorrichtung zum Zufuehren von feinkoernigen oder pulverfoermigen Stoffen mittels eines Traegergases auf die Oberflaeche von Metallschmelzen
AT225213B (de) *	1960-05-27	1963-01-10	Oesterr Alpine Montan	Verfahren und Einrichtung zur Einbringung von Zusatzstoffen in kohlenstoffhaltige Eisenbäder
DE2316768B2 (de) *	1973-04-04	1977-03-03	Fried. Krupp Gmbh, 4300 Essen	Verfahren zum frischen von metallen, insbesondere roheisen, und vorrichtung zur durchfuehrung des verfahrens
US3891196A (en) *	1974-01-21	1975-06-24	Thyssen Niederrhein Ag	Apparatus for treating a melt
US4045213A (en) *	1974-11-28	1977-08-30	Creusot-Loire	Method of injecting a powder containing carbon into a metal bath
FR2459835A1 (fr) *	1979-06-27	1981-01-16	Sueddeutsche Kalkstickstoff	Procede de traitement de fontes liquides permettant d'accroitre la proportion de riblons dans le convertisseur
US4264059A (en) *	1980-03-12	1981-04-28	Victor Benatar	Condition responsive control means for use in discharging powdered reagent into a pool of molten metal
LU82336A1 (fr) *	1980-04-04	1980-07-02	Wurth Anciens Ets Paul	Procede et dispositif de pression et de fluidisation d'une masse pulverulente dans une enceinte de distribution
US4286774A (en) *	1980-04-22	1981-09-01	Victor Benatar	System for automatically injecting a measured quantity of powdered reagent into a pool of molten metal
BE893659A (fr) *	1982-06-25	1982-10-18	Centre Rech Metallurgique	Procede et dispositif pour l'elaboration d'acier dans un convertisseur

1982
- 1982-10-27 LU LU84444A patent/LU84444A1/fr unknown
1983
- 1983-09-20 CA CA000437113A patent/CA1210833A/fr not_active Expired
- 1983-09-21 BR BR8305162A patent/BR8305162A/pt unknown
- 1983-10-20 EP EP83630175A patent/EP0110806B1/fr not_active Expired
- 1983-10-20 AT AT83630175T patent/ATE32351T1/de not_active IP Right Cessation
- 1983-10-20 DE DE8383630175T patent/DE3375583D1/de not_active Expired
- 1983-10-21 FI FI833858A patent/FI73463C/fi not_active IP Right Cessation
- 1983-10-21 US US06/544,073 patent/US4519587A/en not_active Expired - Fee Related
- 1983-10-24 ZA ZA837907A patent/ZA837907B/xx unknown
- 1983-10-25 PT PT77554A patent/PT77554B/pt unknown
- 1983-10-26 NO NO833910A patent/NO833910L/no unknown
- 1983-10-26 ES ES526779A patent/ES526779A0/es active Granted
- 1983-10-27 JP JP58201881A patent/JPS59133315A/ja active Pending
- 1983-10-27 KR KR1019830005086A patent/KR840006371A/ko not_active Application Discontinuation
- 1983-10-27 AU AU20667/83A patent/AU558520B2/en not_active Ceased
- 1983-10-27 IN IN1322/CAL/83A patent/IN160933B/en unknown
- 1983-10-31 AU AU20817/83A patent/AU2081783A/en not_active Abandoned

Also Published As

Publication number	Publication date
FI833858A (fi)	1984-04-28
ES8407570A1 (es)	1984-09-16
ES526779A0 (es)	1984-09-16
FI833858A0 (fi)	1983-10-21
JPS59133315A (ja)	1984-07-31
EP0110806A1 (fr)	1984-06-13
LU84444A1 (fr)	1984-05-10
CA1210833A (fr)	1986-09-02
KR840006371A (ko)	1984-11-29
NO833910L (no)	1984-04-30
ZA837907B (en)	1984-06-27
PT77554A (fr)	1983-11-01
DE3375583D1 (en)	1988-03-10
AU2081783A (en)	1984-05-03
FI73463C (fi)	1987-10-09
ATE32351T1 (de)	1988-02-15
FI73463B (fi)	1987-06-30
AU558520B2 (en)	1987-01-29
BR8305162A (pt)	1984-05-02
PT77554B (fr)	1986-03-12
US4519587A (en)	1985-05-28
IN160933B (pt)	1987-08-15
AU2066783A (en)	1984-05-03

Publication	Publication Date	Title
EP0110806B1 (fr)	1988-02-03	Système de réglage de l'alimentation en matières solides d'une lance de soufflage
US4456476A (en)	1984-06-26	Continuous steelmaking and casting
JP3249816B2 (ja)	2002-01-21	シュラウド付きランスによる先端サブマージド注入
US4365992A (en)	1982-12-28	Method of treating ferrous metal
LU83814A1 (fr)	1983-09-01	Procede et dispositif pour l'affinage d'un bain de metal contenant des matieres refroidissantes solides
US8420009B2 (en)	2013-04-16	Gas cupola for melting metal
US3891196A (en)	1975-06-24	Apparatus for treating a melt
RU2598429C2 (ru)	2016-09-27	Способ и система доставки газа и зернистого материала для металлургического агрегата
US6187258B1 (en)	2001-02-13	Operating method and device for a shaft furnace
US3157492A (en)	1964-11-17	Injection of solid material into molten metal
RU2218418C2 (ru)	2003-12-10	Устройство для предотвращения нарушения кипящего слоя, предназначенное для восстановительного реактора с кипящим слоем
KR20030009458A (ko)	2003-01-29	금속 용융물을 생성하는 방법 및 플랜트
US3626501A (en)	1971-12-07	Apparatus for injecting fluid fuel into a blast furnace
US4497656A (en)	1985-02-05	Steel making method
CA1283297C (fr)	1991-04-23	Dispositif d'injection de matieres solides divisees dans un four, notamment dans un haut-fourneau siderurgique, et applications
UA44347C2 (uk)	2002-02-15	Спосіб отримання рідкого чавуну або напівфабрикатів сталі з залізовмісного матеріалу і установка для його здійснення
JPS61115655A (ja)	1986-06-03	低融点金属の溶鋼への添加方法
US8623270B2 (en)	2014-01-07	Dual outlet injection system
CA1057953A (en)	1979-07-10	Iron or steelmaking process
US3523683A (en)	1970-08-11	Apparatus for injecting fluid fuel into a blast furnace
JP3406648B2 (ja)	2003-05-12	原料投入用ランス
CA1128306A (en)	1982-07-27	Metallurgical vessels
JPH0578722A (ja)	1993-03-30	金属溶融還元炉の操業方法
RU99100285A (ru)	2001-06-20	Способ загрузки носителей металла в плавильно-газификационную зону и установка для его осуществления
RU1801125C (ru)	1993-03-07	Способ продувки жидкого металла и устройство дл его осуществлени

Legal Events

Date	Code	Title	Description
1984-04-16	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
1984-06-13	AK	Designated contracting states	Designated state(s): AT BE DE FR GB IT NL SE
1985-02-20	17P	Request for examination filed	Effective date: 19841203
1987-12-19	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
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1988-03-10	ITF	It: translation for a ep patent filed
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