EP0968312B1 - Verfahren zum einbringen von körnigen feststoffen in metallschmelzen - Google Patents
Verfahren zum einbringen von körnigen feststoffen in metallschmelzen Download PDFInfo
- Publication number
- EP0968312B1 EP0968312B1 EP97916364A EP97916364A EP0968312B1 EP 0968312 B1 EP0968312 B1 EP 0968312B1 EP 97916364 A EP97916364 A EP 97916364A EP 97916364 A EP97916364 A EP 97916364A EP 0968312 B1 EP0968312 B1 EP 0968312B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- solids
- blown
- tapping
- lance
- melt
- 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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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
- C21C7/0043—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material into the falling stream of molten metal
Definitions
- the invention relates to a method according to the preamble of claim 1. This allows solids, which are used for analysis in metal manufacturing, in particular Steel production in different quantities outside the actual metal production process are added in simple way with high accuracy in the analysis and high output without the use of expensive tools such as fireproof lances or induction machines the metal melts are supplied.
- DE-OS 24 08 363 discloses a method for introduction finely divided particles of an aggregate into a liquid metal melt by means of a lance which promotes the aggregates in a tapping jet, while the melt from the Melt container is withdrawn.
- blowing process is also through a complex, personnel-intensive lance economy.
- the object of the invention is a method of trained in such a way that with this free-flowing Bulk goods used in metal manufacturing, in particular the steel production after the actual one Melting process in the converter or in the electric arc furnace to correct the analysis of the metal in a suitable Form must be added in a simple manner be added to the liquid metal so that a high Utilization as a ratio of the absorbed by the metal the amount added is reached without the use cost-intensive auxiliary devices such as fire-proof ones Lances, lance driving devices, winding machines and avoiding the use of cored wire.
- the injection can be blown into the tapping beam of a converter used for steel production or electric arc furnace during racking or in the area of impact of a converter's tapping beam or an electric arc furnace in the ladle or during the ladle metallurgical treatment afterwards to the melting process in the area of the sink during the rinsing treatment on the bathroom surface.
- Free-flowing bulk goods as is usually the case in metal production be used to set the analysis, are carbon carriers for carburizing, lead, Aluminum, sulfur, ferro alloys, etc.
- Prerequisite for using the method according to the invention is that these materials are in granular, inflatable Form.
- the grain size is certain Limits variable; but for reasons of a rapid dissolution of the materials in the metal if possible 3 mm in diameter.
- the bulk goods are blown in pneumatically working blowing system, e.g. B. according to EP 0 164 436.
- the size of the pressure vessel of the transmitter essentially depends on the size of the generating unit and associated with it the amount of material to be injected per treatment from. A pressure vessel with 1,000 to 2,000 l capacity used.
- the bulk goods to be blown in can either be transported via a closed system in silo trucks and storage silos on site, via big bags, sacks or smaller transport containers with 1,000 or 1,500 l capacity.
- One or more are usually above the pressure vessel Intermediate vessels provided as a day bunker to a Fast filling of the injector after the end of treatment sure.
- the method according to the invention also sees that simultaneous or sequential addition of several different ones Materials in the course of a treatment in front.
- the filling process and the subsequent one Pressure build-up in the injector is carried out automatically that the injector is back in no time is eligible.
- the invention is based on the single figure of the Drawing explained in more detail.
- the materials are added to the melt by means of Blowing through a lance 7, 8; since this according to the invention not immersed in or in contact with the melt comes, simple steel pipes without coating are sufficient as lances. There is hardly any wear; the lances can can be used again as often as required.
- the place and time of addition can either be the bundled tapping jet 3 of liquid metal while of racking, the impact area 9 of the metal during of racking in the pan 4 or the sink 6 on the Bath surface 5 during the pan treatment.
- the blowing lances 7, 8 are by means of a Positioning device positioned during the blowing process that always the same boundary conditions as distance to the bath surface, position on the bath surface, angle of inclination etc. can be observed.
- Dense-current funding ensures that the Solid jet in a bundled form either on the tapping jet 3, in the area of impact 9 of the tapping beam in the pan or on the sink 6 when treated in the pan hits; the bundling of the solid stream remains at a distance of up to one meter received from the lance end.
- the necessary distance between the lances 7, 8 to be adhered to the liquid metal to the lances 7, 8 protect against wear; on the other hand, that's just the way it is necessary precise work in the area of the tapping beam 3 or the stain 6 necessary as a requirement for a high spread rate.
- the advantages of the new method are that the dense phase production the costs for the transport gas be kept low, for example when using argon; If nitrogen is used, the low Transport gas quantities and the high production rate ensured that no significant influence on the metal quality by changing the nitrogen content of the liquid Melt occurs.
- the absorption speed depends of the liquid metal for the inflated Solids not only from their ability to dissolve the melt for z. B. carbon or silicon, but is due to the mechanical effect (impulse) of the incident Solid jet in the area of the sink in Interaction with the circulation effect strengthened considerably.
- the distribution of the inflated solid and thus the The concentration is compensated by the circulation effect of the Purge gas introduced via the floor 10. Homogeneity the melt is thus controlled and controlled Inflate on the one hand and through the interaction of Blow pulse and circulation effect on the other hand guaranteed.
- the angle at which the solid jet hits the tapping jet should be between 10 and 80 °.
- the method according to the invention provides for the movement of the Blow lance with the tilting movement of the converter or Electric arc furnace 1 to couple under computer control ensure that the tapping jet 3 and blow jet are centered meet if the solids in the Tapping jet should be blown.
- the blowing lance 7 vertically to arrange. This will also position the lance simplified with changing levels of the bathroom surface 5. The prerequisite for this is that the geometric arrangement of the Flushing system is maintained in the pan bottom.
- the applications relate to the inflation of a fine-grained Carbon carrier with approx. 88% C in the sink area a ladle with a tapping weight of 180 t. This shows that delivery rates of up to 300 are no problem kg / min carbon carrier with good utilization - here as output in relation to the increase in carbon content - are to be realized.
- the distance between the blow lance and the bath surface can also be changed can be varied over a wide range; even at a distance of up to one meter from the bathroom surface is one high utilization ensured.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Furnace Charging Or Discharging (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
- 1
- Ofen
- 2
- Stahlmenge
- 3
- Abstichstrahl
- 4
- Pfanne
- 5
- Badoberfläche
- 6
- Spülfleck
- 7
- Lanze
- 8
- Lanze
- 9
- Auftreffbereich
Claims (10)
- Verfahren zum Einbringen von körnigen bei der Metallherstellung im Anschluß an den Schmelzprozeß benötigten Feststoffen mittels einer pneumatischen, mindestens eine Lanze aufweisenden Förderanlage in die Metallschmelze, wobei die Austrittsöffnung der Lanze oberhalb der Schmelze angeordnet ist, dadurch gekennzeichnet daß die Feststoffe gasarm nach dem Prinzip der Dichtstromförderung in turbulente Bereiche der Schmelze eingeblasen werden.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die körnigen Feststoffe in den Abstichstrahl eines für die Stahlherstellung eingesetzten Konverters oder Elektrolichtbogenofens während des Abstiches eingeblasen werden.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die körnigen Feststoffe in den Auftreffbereich des Abstichstrahles eines Konverters oder eines Elektrolichtbogenofens in der Gießpfanne eingeblasen werden.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die körnigen Feststoffe während der pfannenmetallurgischen Behandlung im Anschluß an den Schmelzprozeß in den Bereich des Spülfleckes während der Spülbehandlung auf die Badoberfläche aufgeblasen werden.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Feststoffe mittels eines einfachen Stahlrohres aufgeblasen werden, dessen Durchmesser zwischen 12,7 und 76,2 mm (1/2 " bis max. 3 ") liegt, vorzugsweise jedoch zwischen 25,4 und 50,8 mm (1 bis 2 ").
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Abstand der Blaslanze zur Badoberfläche oder zum Abstichstrahl zwischen 0.01 und 2.0 m liegt, vorzugsweise jedoch zwischen 0.10 und 1.00 m.
- Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß als Fördergas Argon, Stickstoff, Kohlensäure oder Preßluft eingesetzt wird.
- Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Korngröße der eingeblasenen Feststoffe kleiner 10 mm, vorzugsweise unter 3 mm liegt.
- Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß mehrere unterschiedliche Feststoffarten nacheinander in mehreren Behandlungsschritten getrennt aufgeblasen werden.
- Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß mehrere unterschiedliche Feststoffarten gemeinsam in einem Behandlungsschritt aufgeblasen werden.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP1997/001329 WO1998041658A1 (de) | 1997-03-17 | 1997-03-17 | Verfahren zum einbringen von körnigen feststoffen in metallschmelzen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0968312A1 EP0968312A1 (de) | 2000-01-05 |
EP0968312B1 true EP0968312B1 (de) | 2002-05-08 |
Family
ID=8166553
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97916364A Expired - Lifetime EP0968312B1 (de) | 1997-03-17 | 1997-03-17 | Verfahren zum einbringen von körnigen feststoffen in metallschmelzen |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0968312B1 (de) |
AT (1) | ATE217354T1 (de) |
CA (1) | CA2283903C (de) |
DE (1) | DE59707243D1 (de) |
ES (1) | ES2174245T3 (de) |
WO (1) | WO1998041658A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE508210T1 (de) * | 2006-06-30 | 2011-05-15 | Techcom Gmbh | Pfannenstahldesoxidationsverfahren |
DE102015113241A1 (de) | 2015-08-11 | 2017-02-16 | Rhm Rohstoff-Handelsgesellschaft Mbh | Verfahren zum Einbringen von Zuschlagstoffen in Metallschmelzen |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH584075A5 (de) * | 1973-04-11 | 1977-01-31 | Fischer Ag Georg | |
JPS5542122A (en) * | 1978-09-18 | 1980-03-25 | Kawasaki Steel Corp | Addition adding method at receiving of molten metal in ladle |
JPS57110610A (en) * | 1980-12-27 | 1982-07-09 | Kawasaki Steel Corp | Method for additing additive into molten steel |
US4863684A (en) * | 1989-01-13 | 1989-09-05 | Inland Steel Company | Method and apparatus for adding shot to molten steel |
DE19535014C2 (de) * | 1995-09-21 | 1999-03-04 | Stein Ind Anlagen Inh Christel | Verfahren zum Einbringen von körnigen Feststoffen in Metallschmelzen |
-
1997
- 1997-03-17 EP EP97916364A patent/EP0968312B1/de not_active Expired - Lifetime
- 1997-03-17 DE DE59707243T patent/DE59707243D1/de not_active Expired - Lifetime
- 1997-03-17 WO PCT/EP1997/001329 patent/WO1998041658A1/de active IP Right Grant
- 1997-03-17 CA CA002283903A patent/CA2283903C/en not_active Expired - Fee Related
- 1997-03-17 ES ES97916364T patent/ES2174245T3/es not_active Expired - Lifetime
- 1997-03-17 AT AT97916364T patent/ATE217354T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ATE217354T1 (de) | 2002-05-15 |
EP0968312A1 (de) | 2000-01-05 |
DE59707243D1 (de) | 2002-06-13 |
CA2283903A1 (en) | 1998-09-24 |
WO1998041658A1 (de) | 1998-09-24 |
CA2283903C (en) | 2007-01-02 |
ES2174245T3 (es) | 2002-11-01 |
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