EP0968312A1 - Method for feeding granular solids into metal melts - Google Patents
Method for feeding granular solids into metal meltsInfo
- Publication number
- EP0968312A1 EP0968312A1 EP97916364A EP97916364A EP0968312A1 EP 0968312 A1 EP0968312 A1 EP 0968312A1 EP 97916364 A EP97916364 A EP 97916364A EP 97916364 A EP97916364 A EP 97916364A EP 0968312 A1 EP0968312 A1 EP 0968312A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- solids
- tapping
- blown
- inflated
- granular solids
- 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
Links
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 by means of the use of which there are solids which are added in different quantities for setting the analysis in metal production, in particular steel production, outside the actual metal production process, in a simple manner with high accuracy in the analysis and high output without the use of expensive aids such as refractory delivered lances or spooling machines of the metal melts can be supplied.
- the addition methods mentioned under a) and b) are characterized by a not exactly predictable, comparatively low output and insufficient accuracy, which results in the need for higher consumption of alloying agents and, relatively often, a one or more correction of the addition quantity. If the addition is carried out by hand, additional expenditure on personnel is necessary, at the same time the degree of reproducibility of the analysis results is then comparatively lower.
- the blowing process is also characterized by a complex, labor-intensive lance economy.
- the object of the invention is to develop a method of the type mentioned in such a way that it can be used to pour bulk materials which are capable of freezing and which are used in metal production, in particular steel production, following the actual melting process in the converter or in the electric arc furnace to correct the analysis of the Metal must be added in a suitable form, in a simple manner be added to the liquid metal in such a way that a high utilization is achieved as a ratio of the amount absorbed by the metal to the amount added without the use of costly auxiliary devices such as refractory supplied lances, lance driving devices, winding machines and avoiding the use of cored wires.
- blowing device is spaced from the melt and that the solids are blown into the turbulent areas of the melt in a gas-poor manner according to the principle of the dense phase flow, such as in the tapping jet of a converter or electric arc furnace used for steel production during the tapping or in the Impingement area of the tapping beam of a converter or an electric arc furnace in the ladle or during the ladle metallurgical treatment following the melting process in the area of the rinsing spot during the rinsing treatment are blown onto the bath surface.
- Free-flowing bulk goods such as are usually used in metal production for analysis, are, for example, carbon carriers for carburizing, lead, aluminum, sulfur, ferro-alloys, etc.
- a prerequisite for using the method according to the invention is that these materials are in granular, blow-in form.
- the grain size is variable within certain limits; however, for reasons of rapid dissolution of the materials in the metal, it should, if possible, be less than 3 mm in diameter.
- the bulk goods are blown in by means of a pneumatically operating 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 therewith, on the amount of material to be injected per treatment. Usually a pressure vessel with a capacity of 1,000 to 2,000 liters is used.
- the bulk goods to be blown in can be transported either via a closed system in silo trucks and storage silos on site, via big bags, sacks or smaller transport containers with a capacity of 1,000 or 1,500 liters.
- One or more intermediate vessels are usually provided as day bunkers above the pressure vessel in order to ensure that the injector is filled quickly after the end of treatment.
- the method according to the invention also provides for the simultaneous or sequential addition of several different materials in the course of a treatment.
- the filling process and the subsequent pressure build-up in the injector are carried out automatically so that the injector is ready for delivery again within a very short time.
- the location and the time of the addition can be either the bundled tapping jet 3 of the liquid metal during tapping, the impact area 9 of the metal during tapping in the pan 4 or the flushing spot 6 on the bath surface 5 during the pan treatment.
- blowing lances 7, 8 are positioned by means of a moving device during the blowing process in such a way that the same boundary conditions as the distance to the bath surface, position on the bath surface, angle of inclination, etc. can always be maintained.
- the method provides for the use of existing measurement methods, for example based on laser measurement, ultrasound measurements, etc.
- the solid jet in a bundled form either meets the tapping jet 3, the target area 9 of the tapping jet in the pan or the washing stain 6 during treatment in the pan; the bundling of the solid stream is also maintained at a distance of up to one meter from the end of the lance.
- the necessary distance of the lances 7, 8 from the liquid metal can be maintained in order to protect the lances 7, 8 from wear; on the other hand, the necessary precise work in the area of the tapping jet 3 or the flushing spot 6 is only necessary as a prerequisite for a high application rate.
- dense phase conveying also makes it possible to work with the smallest possible amounts of conveying gases.
- the process envisages the use of all gases known in the field of the metal-producing industry, such as argon, nitrogen, air or even carbonic acid.
- the advantages of the new method are that the costs for the transport gas are kept low because of the dense phase flow, for example when using argon; If nitrogen is used, the low transport gas quantities and the high delivery rate ensure that that there is no significant influence on the metal quality by changing the nitrogen contents of the liquid melt.
- the rate of absorption of the liquid metal for the inflated solids does not only depend on the pure dissolving power of the melt for e.g. B. carbon or silicon, but is still significantly enhanced by the mechanical effect (impulse) of the impinging solid jet in the area of the rinsing spot in cooperation with the circulation effect.
- the distribution of the inflated solid and thus the concentration equalization takes place through the circulation effect of the flushing gas 10 introduced via the floor.
- the homogeneity of the melt is thus ensured on the one hand by means of targeted and controlled inflation and on the other hand by the interaction of the blowing impulse and the circulation effect.
- the entrainment effect of the bundled metal jet ensures that even large quantities inflated per unit of time are transported into the melted amount already underneath in the pan.
- 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 computer-controlled coupling of the movement of the blowing lance with the tilting movement of the converter or of the electric arc furnace 1 in order to ensure that the tapping jet 3 and blowing jet meet one another centrally, provided that the solids are to be blown into the tapping jet.
- the blowing lance must be raised in accordance with the rise in the bath level. This process can be checked by coupling the corresponding control element on the lance traversing device to the weighing system of the ladle truck or other measuring systems for weight detection. A measurement of the bath level in the pan is also provided in the manner described above.
- the applications relate to the inflation of a fine-grained carbon carrier with approx. 88% C into the sink area of a ladle with a tapping weight of 180 t. This shows that feed rates of up to 300 kg / min carbon carriers with good utilization are problem-free - here as a spread in relation to the increase in carbon contents - to be realized.
- the distance between the blowing lance and the surface of the bath can also be varied within a wide range; High utilization is ensured even at a distance of up to one meter from the bathroom surface.
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)
- Manufacture And Refinement Of Metals (AREA)
- Furnace Charging Or Discharging (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP1997/001329 WO1998041658A1 (en) | 1997-03-17 | 1997-03-17 | Method for feeding granular solids into metal melts |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0968312A1 true EP0968312A1 (en) | 2000-01-05 |
EP0968312B1 EP0968312B1 (en) | 2002-05-08 |
Family
ID=8166553
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97916364A Expired - Lifetime EP0968312B1 (en) | 1997-03-17 | 1997-03-17 | Method for feeding granular solids into metal melts |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0968312B1 (en) |
AT (1) | ATE217354T1 (en) |
CA (1) | CA2283903C (en) |
DE (1) | DE59707243D1 (en) |
ES (1) | ES2174245T3 (en) |
WO (1) | WO1998041658A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BRPI0621816B1 (en) * | 2006-06-30 | 2015-06-02 | Techcom Gmbh | Steel pan deoxidization method |
DE102015113241A1 (en) | 2015-08-11 | 2017-02-16 | Rhm Rohstoff-Handelsgesellschaft Mbh | Method for introducing additives into molten metals |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH584075A5 (en) * | 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 (en) * | 1995-09-21 | 1999-03-04 | Stein Ind Anlagen Inh Christel | Process for introducing granular solids into molten metals |
-
1997
- 1997-03-17 WO PCT/EP1997/001329 patent/WO1998041658A1/en active IP Right Grant
- 1997-03-17 CA CA002283903A patent/CA2283903C/en not_active Expired - Fee Related
- 1997-03-17 EP EP97916364A patent/EP0968312B1/en not_active Expired - Lifetime
- 1997-03-17 DE DE59707243T patent/DE59707243D1/en not_active Expired - Lifetime
- 1997-03-17 ES ES97916364T patent/ES2174245T3/en not_active Expired - Lifetime
- 1997-03-17 AT AT97916364T patent/ATE217354T1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9841658A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1998041658A1 (en) | 1998-09-24 |
ATE217354T1 (en) | 2002-05-15 |
CA2283903C (en) | 2007-01-02 |
CA2283903A1 (en) | 1998-09-24 |
DE59707243D1 (en) | 2002-06-13 |
EP0968312B1 (en) | 2002-05-08 |
ES2174245T3 (en) | 2002-11-01 |
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