CA2283903C - Method for feeding granular solids into metal melts - Google Patents
Method for feeding granular solids into metal melts Download PDFInfo
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- CA2283903C CA2283903C CA002283903A CA2283903A CA2283903C CA 2283903 C CA2283903 C CA 2283903C CA 002283903 A CA002283903 A CA 002283903A CA 2283903 A CA2283903 A CA 2283903A CA 2283903 C CA2283903 C CA 2283903C
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- melt
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- metal
- tapping
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- 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
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- 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
The invention relates to a method for feeding solids into metal or steel melts whereby granular solids required during the analysis adjustment are fed in a predetermined quantity into the turbulent regions of the metal melt in a dense flow process by means of a pneumatic conveying device in order to achieve a high output whilst avoiding expensive and complex measures associated with lances and capital-intensive investments for injection devices and lance-moving devices.
Description
METHOD FOR FEEDINd GRANTJLAR SOLIDS INTO METAL MELTS
The invention relates to a method by which solids, which are added for the analysis adjustment during the metal production, in particular steel production, in varying amounts outside of the actual metal-producing process, can be fed in a simple manner with a high accuracy in the analysis and a high output without using expensive auxiliary means like refractorily supplied lances or threading machines to the metal melts.
K. Scheidig et al discloses in "Stahl and Eisen" (Steel and Iron), Volume 105, No. 25-26 of December 16, 1985, Pages 1437-1441, a pneumatic injecting of coal dust through the blast tuyere of a blast furnace by dense flow conveyance.
The coal dust is thereby injected into the melt in measured quantities.
DE-OS 24 08 363 discloses a method for introducing finely divided particles of an aggregate into a liquid metal melt, while the melt is removed from the melt container.
Because of the increasing demands by the customers regarding the maintaining of analysis regulations by the steel producer and simultaneously continuously increasing competitive pressures, secondary metallurgy, that is the treatment of the liquid metals following the actual metal production in a converter or electric-arc oven, has increasingly gained in importance within the past years.
During the course of this development the method, through which fine-granular, fluid solids, as they are needed for adjusting the end analysis of the liquid metal, in particular, steel in varying amounts, are added to the metal melt, receive more and more importance with regard to the prediction of the output, the accuracy of the analysis, method expenses, operation safety and flexibility.
RCV BY : 9- 15-99 : 11 : 14 AM : 61 f; 3F31 54 B5-~ SMART & I B ! GGAR : # 3 The methods, which are used today, are:
a) addition utilizing the force of gravity during the tapping by means of chiding, flowing or manual feeding;
b) addition to the bath surface in the pan by means of conveyor systems or manually;
c) threading of fill wires by means of threading machines;
d) injection by dipping in refractorily supplied dipping lances such as, for example, the TN-method.
1C The addition methods mentioned under a) and b) are characterized by not being exactly predictable, a comparatively low output and insufficient accuracy, which results in the necessity of an increased consumption of alloy media and, relative3.y often, a one-time or repeated ~.5 correction of the added amount. If the addition is done manually, then additional personnel is needed and, at the same time, the degree of the reproducibility of the analysis results is then aomparat~.vely even less.
By comparison, the methods mentioned under c) and d) 20 are distinguished by a comparatively high accuracy and high reproducibility. However, the high costs are disadvantageous.
These high coasts are caus~d in the methods according to c) by the production costs of the fill wire needed for the 25 threading, in the methods according to d) by the specific refractory costs of the injection lances, which have a much shorter life bccausm of the exiting temperatures and the necessary treatment duration than, for e~sample, the pure fluehir~g lances.
3o The injection methods axe moreover characterized by expensive, personnel-intensive lance procedures.
Further disadvantages8 of the up to now used methods are that the amounts of alloy media, which aan be added per unit of time, are limited by the technical boundary conditions, 35 for example, during threading or injecting. In addition, she metal melt experiences during the treatment according to the method according to c) and d) a stronger cooling off, when threading in fill wires, it is necessary to additionally melt the surrounding metal envelope and during injection, heat is additionally radiated to the refractory material of the lance and to the transport gas.
The purpose of the invention is to design a method of the abovementioned type in such a manner that with said method, fluid loose materials, which must be added in a suitable manner during the metal production, in particular the steel production, following the actual melting process in the converter or in the electric-arc oven for the correction of the analysis of the metal, are added in a simple manner to the liquid metal so that a high utilization of the ratio between the amount absorbed by the metal and the amount added is achieved without using expensive auxiliary devices such as, for example, refractorily supplied lances, lance-moving devices, threading machines and by avoiding the use of fill wires.
According to a broad aspect of the present invention, there is provided a method for introducing granular solids needed for metal manufacture into a metal melt following a melt process by means of a pneumatic conveying system having at least one lance with an outlet opening provided above the metal melt, characterized in that the granular solids are transported by a conveying gas in the form of a clustered stream through turbulent areas into deep areas of the melt into a tapping beam provided in the melt of a converter or of an electric-arc oven utilized for steel production during tapping.
According to another broad aspect of the present invention, there is provided a method for introducing granular solids needed for metal manufacture into a metal melt following a melt process by means of a pneumatic conveying system having at least one lance with an outlet opening provided above the metal melt, characterized in that the granular solids are transported by a conveying gas in the form of a clustered stream through turbulent areas into deep areas of the melt into an impact area of a tapping provided in the melt of a converter or of an electric-arc oven in a casting ladle.
According to still another broad aspect of the present invention, there is provided a method for introducing granular solids needed for metal manufacture into a metal melt following a melt process by means of a pneumatic conveying system having at least one lance with an outlet opening provided above the metal melt, characterized in that the granular solids are transported by a conveying gas in the form of a clustered stream through turbulent areas into deep areas of the melt during a ladle-metallurgical treatment following the melt process in the area of a flushing spot during a flushing treatment.
The injection can occur into the tapping beam of a converter or electric-arc oven utilized for the steel production during the tapping or into the impact area of the tapping beam of a converter or of an electric-arc oven in the casting ladle or during the ladle-metallurgical treatment following the melting process into the area of the flushing spot during the flushing treatment on the bath surface.
Fluid loose materials, as they are usually utilized during the metal production for analysis adjustment, are, for example carbonaceous materials for carburization, lead, aluminum, sulfur, ferroalloys, and others.
3a A condition for the use of the method of the invention is that these materials exist in a granular, injectable form. The grain size is thereby variable within certain limits but should, however, lie as much as possible below 3b RCV av : 1- 15-9a : 1 1 : 1 S.AM : E~ 16 381 >465-~ SMART' & B 1 GG AR : #
3 mm in diameter for reasons of a quick dissolving of the materials in the metal.
The loose material is injected by means of a pneumatically operating injection system, for example, according to EP 0 164 436. The size of the pressure receptacle of the system depends essentially on the size of the production unit and is related to the amount of material to be injected per treatment. '(7sually a pressure receptacle with a 1,000 to 2,000 1 capacity is used.
The loose materials 1:o be injected can be supplied either through a closed system in silo trucks and storage silos on site, through big bags, sacks or smaller transport containers with a 1,000 or 1,500 1 capacity. one or more intermediate receptacles are usually provided above the pressure receptacle as day bunkers in order to assure a quick filling of the injector after the end of the treatment.
The method of the inventia>lz, in addition. also provides the simultaneous or sequential addition of several different z0 materials during the course Qf one treatment.
~'he filing process and the following pressure build-up in the injector axe for this purpose automatically designed in such a manner that the injector xs again ready to convey within the shortest period of time.
Thus, smaller amounts of various materials can either be added separately, timely stepped or can be removed by preselecting the till amounts one after the other into the injector and can be injected in one single operating step.
The materials are added into the melt by means of injection through a lance '7, a and since the lance does not dip into the melt or comes into contact with same, simple steel pipes without coating are sufficient as lances. 'Wear hardly occurs and the lances can be used again ae often as desired.
The place and the time of the addition can either be the clustered tapping beam 3 of the liquid metal during the KCV BY: 9-15-J9 :11:15AM : 6lEi aE31 ti4E45--~ S11ART &I B1GGAR:#! 6 tapping, the impact area 9 of the metal during the tapping in the ladle 4 or the flushing spot 6 on the bath surface 5 during the ladle treatment.
The injection lances 7, 8 are for this purpose positioned by means of a device of the method during the injection process in such a manner that at all times the same boundax~~r conditions like distance from the bath surface, position on the bath surface, angle of inclination, etC. cari be mairi~alned.
It is thereby a.mportant that even when the bath level 5 changes, fox example during the tapping process from an oven 1, at varying steel amounts 2 in the ladle 4 or caused by refractory wear, the optimum distance of the lance top from the bath surface 5 is safely maintained. The method 25 .utilizes thereby already existing measuring methods, for example, on the basis of a laser measurement, of ultrasound measurements, etc.
when adding into the tapping beam 3, a high injection rate must be utilized since this operation is limited in a0 time. Usual tapping times of converters ~ lie between 5 to 7 minutes and of electric-arc ovens with eccentric bottom tapping at approximately 2 minutes.
~.n order to guarantee the carrying along of the injected solids by the tapping beam into the metal amount 25 already tapped into the ladle or in the flushing spot area through the circulating effect into deeper regions of the metal melt, it is necessary to convey the solids in a dense flow. Suitable injectors are available for this.
By means of the dense-flow conveying, it is guaranteed 30 that the stream of solids hits in a clustered farm either the tapping beam 3, the impact area 9 of the tapping beam in the ladle or the flushing spot 6 during treatment i,n the ladle and the clustering of the stream of solids is thereby also still maintained at a distance of up to one meter from 35 the end of the lance.
The invention relates to a method by which solids, which are added for the analysis adjustment during the metal production, in particular steel production, in varying amounts outside of the actual metal-producing process, can be fed in a simple manner with a high accuracy in the analysis and a high output without using expensive auxiliary means like refractorily supplied lances or threading machines to the metal melts.
K. Scheidig et al discloses in "Stahl and Eisen" (Steel and Iron), Volume 105, No. 25-26 of December 16, 1985, Pages 1437-1441, a pneumatic injecting of coal dust through the blast tuyere of a blast furnace by dense flow conveyance.
The coal dust is thereby injected into the melt in measured quantities.
DE-OS 24 08 363 discloses a method for introducing finely divided particles of an aggregate into a liquid metal melt, while the melt is removed from the melt container.
Because of the increasing demands by the customers regarding the maintaining of analysis regulations by the steel producer and simultaneously continuously increasing competitive pressures, secondary metallurgy, that is the treatment of the liquid metals following the actual metal production in a converter or electric-arc oven, has increasingly gained in importance within the past years.
During the course of this development the method, through which fine-granular, fluid solids, as they are needed for adjusting the end analysis of the liquid metal, in particular, steel in varying amounts, are added to the metal melt, receive more and more importance with regard to the prediction of the output, the accuracy of the analysis, method expenses, operation safety and flexibility.
RCV BY : 9- 15-99 : 11 : 14 AM : 61 f; 3F31 54 B5-~ SMART & I B ! GGAR : # 3 The methods, which are used today, are:
a) addition utilizing the force of gravity during the tapping by means of chiding, flowing or manual feeding;
b) addition to the bath surface in the pan by means of conveyor systems or manually;
c) threading of fill wires by means of threading machines;
d) injection by dipping in refractorily supplied dipping lances such as, for example, the TN-method.
1C The addition methods mentioned under a) and b) are characterized by not being exactly predictable, a comparatively low output and insufficient accuracy, which results in the necessity of an increased consumption of alloy media and, relative3.y often, a one-time or repeated ~.5 correction of the added amount. If the addition is done manually, then additional personnel is needed and, at the same time, the degree of the reproducibility of the analysis results is then aomparat~.vely even less.
By comparison, the methods mentioned under c) and d) 20 are distinguished by a comparatively high accuracy and high reproducibility. However, the high costs are disadvantageous.
These high coasts are caus~d in the methods according to c) by the production costs of the fill wire needed for the 25 threading, in the methods according to d) by the specific refractory costs of the injection lances, which have a much shorter life bccausm of the exiting temperatures and the necessary treatment duration than, for e~sample, the pure fluehir~g lances.
3o The injection methods axe moreover characterized by expensive, personnel-intensive lance procedures.
Further disadvantages8 of the up to now used methods are that the amounts of alloy media, which aan be added per unit of time, are limited by the technical boundary conditions, 35 for example, during threading or injecting. In addition, she metal melt experiences during the treatment according to the method according to c) and d) a stronger cooling off, when threading in fill wires, it is necessary to additionally melt the surrounding metal envelope and during injection, heat is additionally radiated to the refractory material of the lance and to the transport gas.
The purpose of the invention is to design a method of the abovementioned type in such a manner that with said method, fluid loose materials, which must be added in a suitable manner during the metal production, in particular the steel production, following the actual melting process in the converter or in the electric-arc oven for the correction of the analysis of the metal, are added in a simple manner to the liquid metal so that a high utilization of the ratio between the amount absorbed by the metal and the amount added is achieved without using expensive auxiliary devices such as, for example, refractorily supplied lances, lance-moving devices, threading machines and by avoiding the use of fill wires.
According to a broad aspect of the present invention, there is provided a method for introducing granular solids needed for metal manufacture into a metal melt following a melt process by means of a pneumatic conveying system having at least one lance with an outlet opening provided above the metal melt, characterized in that the granular solids are transported by a conveying gas in the form of a clustered stream through turbulent areas into deep areas of the melt into a tapping beam provided in the melt of a converter or of an electric-arc oven utilized for steel production during tapping.
According to another broad aspect of the present invention, there is provided a method for introducing granular solids needed for metal manufacture into a metal melt following a melt process by means of a pneumatic conveying system having at least one lance with an outlet opening provided above the metal melt, characterized in that the granular solids are transported by a conveying gas in the form of a clustered stream through turbulent areas into deep areas of the melt into an impact area of a tapping provided in the melt of a converter or of an electric-arc oven in a casting ladle.
According to still another broad aspect of the present invention, there is provided a method for introducing granular solids needed for metal manufacture into a metal melt following a melt process by means of a pneumatic conveying system having at least one lance with an outlet opening provided above the metal melt, characterized in that the granular solids are transported by a conveying gas in the form of a clustered stream through turbulent areas into deep areas of the melt during a ladle-metallurgical treatment following the melt process in the area of a flushing spot during a flushing treatment.
The injection can occur into the tapping beam of a converter or electric-arc oven utilized for the steel production during the tapping or into the impact area of the tapping beam of a converter or of an electric-arc oven in the casting ladle or during the ladle-metallurgical treatment following the melting process into the area of the flushing spot during the flushing treatment on the bath surface.
Fluid loose materials, as they are usually utilized during the metal production for analysis adjustment, are, for example carbonaceous materials for carburization, lead, aluminum, sulfur, ferroalloys, and others.
3a A condition for the use of the method of the invention is that these materials exist in a granular, injectable form. The grain size is thereby variable within certain limits but should, however, lie as much as possible below 3b RCV av : 1- 15-9a : 1 1 : 1 S.AM : E~ 16 381 >465-~ SMART' & B 1 GG AR : #
3 mm in diameter for reasons of a quick dissolving of the materials in the metal.
The loose material is injected by means of a pneumatically operating injection system, for example, according to EP 0 164 436. The size of the pressure receptacle of the system depends essentially on the size of the production unit and is related to the amount of material to be injected per treatment. '(7sually a pressure receptacle with a 1,000 to 2,000 1 capacity is used.
The loose materials 1:o be injected can be supplied either through a closed system in silo trucks and storage silos on site, through big bags, sacks or smaller transport containers with a 1,000 or 1,500 1 capacity. one or more intermediate receptacles are usually provided above the pressure receptacle as day bunkers in order to assure a quick filling of the injector after the end of the treatment.
The method of the inventia>lz, in addition. also provides the simultaneous or sequential addition of several different z0 materials during the course Qf one treatment.
~'he filing process and the following pressure build-up in the injector axe for this purpose automatically designed in such a manner that the injector xs again ready to convey within the shortest period of time.
Thus, smaller amounts of various materials can either be added separately, timely stepped or can be removed by preselecting the till amounts one after the other into the injector and can be injected in one single operating step.
The materials are added into the melt by means of injection through a lance '7, a and since the lance does not dip into the melt or comes into contact with same, simple steel pipes without coating are sufficient as lances. 'Wear hardly occurs and the lances can be used again ae often as desired.
The place and the time of the addition can either be the clustered tapping beam 3 of the liquid metal during the KCV BY: 9-15-J9 :11:15AM : 6lEi aE31 ti4E45--~ S11ART &I B1GGAR:#! 6 tapping, the impact area 9 of the metal during the tapping in the ladle 4 or the flushing spot 6 on the bath surface 5 during the ladle treatment.
The injection lances 7, 8 are for this purpose positioned by means of a device of the method during the injection process in such a manner that at all times the same boundax~~r conditions like distance from the bath surface, position on the bath surface, angle of inclination, etC. cari be mairi~alned.
It is thereby a.mportant that even when the bath level 5 changes, fox example during the tapping process from an oven 1, at varying steel amounts 2 in the ladle 4 or caused by refractory wear, the optimum distance of the lance top from the bath surface 5 is safely maintained. The method 25 .utilizes thereby already existing measuring methods, for example, on the basis of a laser measurement, of ultrasound measurements, etc.
when adding into the tapping beam 3, a high injection rate must be utilized since this operation is limited in a0 time. Usual tapping times of converters ~ lie between 5 to 7 minutes and of electric-arc ovens with eccentric bottom tapping at approximately 2 minutes.
~.n order to guarantee the carrying along of the injected solids by the tapping beam into the metal amount 25 already tapped into the ladle or in the flushing spot area through the circulating effect into deeper regions of the metal melt, it is necessary to convey the solids in a dense flow. Suitable injectors are available for this.
By means of the dense-flow conveying, it is guaranteed 30 that the stream of solids hits in a clustered farm either the tapping beam 3, the impact area 9 of the tapping beam in the ladle or the flushing spot 6 during treatment i,n the ladle and the clustering of the stream of solids is thereby also still maintained at a distance of up to one meter from 35 the end of the lance.
RCV Bl' : 9- .15-9:3 : 1 1 : ) 6AM ; Eil Ei :381 54E15-. SMART &I B 1 GGAR ; #
Thue,~~.t is possible an the one hand to maintain the necessary distance of the lances '7, 8 from the liquid metal in order try protect the lances 7, B from wear and, on the other hand, the necessary praci~se working in the area of the tapping beam 3 or of the flushing spot 6 is needed only in thin manner as the condition for a high output rate.
In addition, using the dense-stream conveying makes it possible to work with the least possible amounts of cr~nveying gases. The method provides for the utilization of all gases known in the area of th~ rnetai-producing industry like argon, nitrogen, air or even carbon dio~cide.
The advantages of the new method are that becau»e of the dense-stream conveying, the costs for the transport gas are kept low, fox example, when using organ or nitrogen, it i5 is assured because of the small transport-gas amounts and the high conveying rate that no significant influence of the quality of the metal through the charge of the nitrogen content of the liquid melt occurs.
When the solid material needed for the analysis ad~u6tment is injected in the area of the flushing spat s, then the abraorptio~ speed of the liquid metal for the injected solids does not only depend an the pure dissolving power of the melt for, for example, carbon or silicon, but ~.s yet significantly reinforced through the mechanical 2.5 effect of Impacting the stream of solids in the area of the flushing spot in coo&eration with the circulating effect.
Thus, it is assured that the injected solids during the moment of impact on the bath surface 5 are ~.mmediate7.y, that is, without delay, either dir~sol.~red. in the bath or 3o transported deep into the inside of the melt where the diSSOlviiZg power for the injected solid material has net yet been exhausted.
The distributi4n of the injected solid material and thus the concentration balance is effected by the 35 c:.rculating action of the flushing gas 10 introduced at the boytom. The homogeneity of the melt is thus guaranteed by RCV BY : ;H- 15-99 : 11 : 1 F.4AM : 616 :381 5465-~ SMART & 131 GGAR : # 8 means- of a precise and regulated injection on the one hand and by the cooperation of the blowing impulse and circulating action on the other hand.
when the solids are injected into a tapping beam 3, then the currying action of the clustered metal stream takes care of the transport of also large amounts of solidx per unit of time into the already tapped amount of melt existing below in the ladle.
The angle, at which the ~atream of solids hits the tapping beam, should lie between 10 and Bo°.
The msthod of the invention provides to couple computer-control c~f the movement of the injecting lance with the tipping movement of the converter or of the electric-arc oven 1 in order to assure that the tapping beam 3 and the is injected stream hit central7.y onto one another when the solids are supposed to be blown into the tapping beam.
When the solids are supposed to be blown into the impact area 9 of the tapping beam during the tapping, then the injection lance must be lifted corresponding with the risge of the bath level. This process carp be controlled by means of coupling the respective final. control element on the lance-moving device with the weighing system of the ladle carriage or other measuring ayatemS for the weight detection. Also, a measuring of the bath-level hezght in ~5 the ladle is provided in the aforedescribed manner.
When the solids era blown in the area of the flushing spot 6 onto the bath surface during the ladle treatment, it has been proven advantageous to arrange the injection lance ~ vertically. This simplifies the positioning of the lance 30 during the changing level of tyre bath surface 5. A
condition fox this is that the geometric arrangement of the flushing system in the ladle bottom is maintained.
The applications relate to the injection of a fine-granulax carbonaceous mater~.al with approximately 88~r c into 35 the flushing-spot area of a casting ladle with ssp t tapping weight. IC has been proven hereby that outputs of up to RCS' F3Y : - 9- 15-99 : 11 : 17.AM : E;16 Bt31 546-. SMART" & B I GGAR : ## 9 300 kg/min carbonaceous material with a simultaneous good utilization, here as output in relationship to the increase of the carbon contents, can be achieved without any problems.
Also, the distance of the injection lance from the bath surface can be varied in wide ranges. Even in the case of a distance of up to one meter from the bath surface, a high utilization is assured.
It has been proven to be advantageous to continue to ZO flush the ladle 4 after the treatment has ended. The melt is homogeni2ed in this manner and carbon, particles, which have riot yet been dissolved, and which had already been transported to the inside of the bath by the circulating action of the flushing gas and the mechanical impulse of the injection stream, axe disa~olved in the melt. A further increase of the analyzed carbon content is connected therewith.
Thue,~~.t is possible an the one hand to maintain the necessary distance of the lances '7, 8 from the liquid metal in order try protect the lances 7, B from wear and, on the other hand, the necessary praci~se working in the area of the tapping beam 3 or of the flushing spot 6 is needed only in thin manner as the condition for a high output rate.
In addition, using the dense-stream conveying makes it possible to work with the least possible amounts of cr~nveying gases. The method provides for the utilization of all gases known in the area of th~ rnetai-producing industry like argon, nitrogen, air or even carbon dio~cide.
The advantages of the new method are that becau»e of the dense-stream conveying, the costs for the transport gas are kept low, fox example, when using organ or nitrogen, it i5 is assured because of the small transport-gas amounts and the high conveying rate that no significant influence of the quality of the metal through the charge of the nitrogen content of the liquid melt occurs.
When the solid material needed for the analysis ad~u6tment is injected in the area of the flushing spat s, then the abraorptio~ speed of the liquid metal for the injected solids does not only depend an the pure dissolving power of the melt for, for example, carbon or silicon, but ~.s yet significantly reinforced through the mechanical 2.5 effect of Impacting the stream of solids in the area of the flushing spot in coo&eration with the circulating effect.
Thus, it is assured that the injected solids during the moment of impact on the bath surface 5 are ~.mmediate7.y, that is, without delay, either dir~sol.~red. in the bath or 3o transported deep into the inside of the melt where the diSSOlviiZg power for the injected solid material has net yet been exhausted.
The distributi4n of the injected solid material and thus the concentration balance is effected by the 35 c:.rculating action of the flushing gas 10 introduced at the boytom. The homogeneity of the melt is thus guaranteed by RCV BY : ;H- 15-99 : 11 : 1 F.4AM : 616 :381 5465-~ SMART & 131 GGAR : # 8 means- of a precise and regulated injection on the one hand and by the cooperation of the blowing impulse and circulating action on the other hand.
when the solids are injected into a tapping beam 3, then the currying action of the clustered metal stream takes care of the transport of also large amounts of solidx per unit of time into the already tapped amount of melt existing below in the ladle.
The angle, at which the ~atream of solids hits the tapping beam, should lie between 10 and Bo°.
The msthod of the invention provides to couple computer-control c~f the movement of the injecting lance with the tipping movement of the converter or of the electric-arc oven 1 in order to assure that the tapping beam 3 and the is injected stream hit central7.y onto one another when the solids are supposed to be blown into the tapping beam.
When the solids are supposed to be blown into the impact area 9 of the tapping beam during the tapping, then the injection lance must be lifted corresponding with the risge of the bath level. This process carp be controlled by means of coupling the respective final. control element on the lance-moving device with the weighing system of the ladle carriage or other measuring ayatemS for the weight detection. Also, a measuring of the bath-level hezght in ~5 the ladle is provided in the aforedescribed manner.
When the solids era blown in the area of the flushing spot 6 onto the bath surface during the ladle treatment, it has been proven advantageous to arrange the injection lance ~ vertically. This simplifies the positioning of the lance 30 during the changing level of tyre bath surface 5. A
condition fox this is that the geometric arrangement of the flushing system in the ladle bottom is maintained.
The applications relate to the injection of a fine-granulax carbonaceous mater~.al with approximately 88~r c into 35 the flushing-spot area of a casting ladle with ssp t tapping weight. IC has been proven hereby that outputs of up to RCS' F3Y : - 9- 15-99 : 11 : 17.AM : E;16 Bt31 546-. SMART" & B I GGAR : ## 9 300 kg/min carbonaceous material with a simultaneous good utilization, here as output in relationship to the increase of the carbon contents, can be achieved without any problems.
Also, the distance of the injection lance from the bath surface can be varied in wide ranges. Even in the case of a distance of up to one meter from the bath surface, a high utilization is assured.
It has been proven to be advantageous to continue to ZO flush the ladle 4 after the treatment has ended. The melt is homogeni2ed in this manner and carbon, particles, which have riot yet been dissolved, and which had already been transported to the inside of the bath by the circulating action of the flushing gas and the mechanical impulse of the injection stream, axe disa~olved in the melt. A further increase of the analyzed carbon content is connected therewith.
Claims (33)
1. A method for introducing granular solids needed for metal manufacture into a metal melt following a melt process by means of a pneumatic conveying system having at least one lance with an outlet opening provided above the metal melt, characterized in that the granular solids are transported by a conveying gas in the form of a clustered stream through turbulent areas into deep areas of the melt into a tapping beam provided in the melt of a converter or of an electric-arc oven utilized for steel production during tapping.
2. The method according to claim 1, characterized in that the solids are injected by means of a simple steel pipe, the diameter of which lies between 1/2" and up to a maximum of 3".
3. The method according to claim 1, characterized in that the distance of the injection lance from the melt surface or from a tapping beam provided in the melt lies between 0.01 and 2.0 m.
4. The method according to claim 1, characterized in that argon, nitrogen, carbon dioxide or compressed air is used as a conveying gas.
5. The method according to claim 1, characterized in that the grain size of the injected solids is less than 10 mm.
6. The method according to claim 1, characterized in that several different solids are injected separately one after the other in several treatment steps.
7. The method according to claim 1, characterized in that several different solids are injected together in one treatment step.
8. The method according to claim 1, characterized in that the solids are injected by a simple steel pipe having a diameter of from 1 to 2".
9. The method according to claim 1, characterized in that the distance of the injection lance from the melt or from a tapping beam provided in the melt is from 0.1 to 1.00 m.
10. The method according to claim 1, characterized in that the grain size of the injected solids is less than 3 mm.
11. The method according to claim 1, wherein the turbulent areas are formed by a scavenging area or at the surface of the melt at which the clustered stream impacts.
12. A method for introducing granular solids needed for metal manufacture into a metal melt following a melt process by means of a pneumatic conveying system having at least one lance with an outlet opening provided above the metal melt, characterized in that the granular solids are transported by a conveying gas in the form of a clustered stream through turbulent areas into deep areas of the melt into an impact area of a tapping provided in the melt of a converter or of an electric-arc oven in a casting ladle.
13. The method according to claim 12, characterized in that the solids are injected by means of a simple steel pipe, the diameter of which lies between 1/2" and up to a maximum of 3".
14. The method according to claim 12, characterized in that the distance of the injection lance from the melt surface or from a tapping beam provided in the melt lies between 0.01 and 2.0 m.
15. The method according to claim 12, characterized in that argon, nitrogen, carbon dioxide or compressed air is used as a conveying gas.
16. The method according to claim 12, characterized in that the grain size of the injected solids is less than 10 mm.
17. The method according to claim 12, characterized in that several different solids are injected separately one after the other in several treatment steps.
18. The method according to claim 12, characterized in that several different solids are injected together in one treatment step.
19. The method according to claim 12, characterized in that the solids are injected by a simple steel pipe having a diameter of from 1 to 2".
20. The method according to claim 12, characterized in that the distance of the injection lance from the melt or from a tapping beam provided in the melt is from 0.1 to 1.00 m.
21. The method according to claim 12, characterized in that the grain size of the injected solids is less than 3 mm.
22. The method according to claim 12, wherein the turbulent areas are formed by a scavenging area or at the surface of the melt at which the clustered stream impacts.
23. A method for introducing granular solids needed for metal manufacture into a metal melt following a melt process by means of a pneumatic conveying system having at least one lance with an outlet opening provided above the metal melt, characterized in that the granular solids are transported by a conveying gas in the form of a clustered stream through turbulent areas into deep areas of the melt during a ladle-metallurgical treatment following the melt process in the area of a flushing spot during a flushing treatment.
24. The method according to claim 23, characterized in that the solids are injected by means of a simple steel pipe, the diameter of which lies between 1/2" and up to a maximum of 3".
25. The method according to claim 23, characterized in that the distance of the injection lance from the melt surface or from a tapping beam provided in the melt lies between 0.01 and 2.0 m.
26. The method according to claim 23, characterized in that argon, nitrogen, carbon dioxide or compressed air is used as a conveying gas.
27. The method according to claim 23, characterized in that the grain size of the injected solids is less than 10 mm.
28. The method according to claim 23, characterized in that several different solids are injected separately one after the other in several treatment steps.
29. The method according to claim 23, characterized in that several different solids are injected together in one treatment step.
30. The method according to claim 23, characterized in that the solids are injected by a simple steel pipe having a diameter of from 1 to 2".
31. The method according to claim 23, characterized in that the distance of the injection lance from the melt or from a tapping beam provided in the melt is from 0.1 to 1.00 m.
32. The method according to claim 23, characterized in that the grain size of the injected solids is less than 3 mm.
33. The method according to claim 23, wherein the turbulent areas are formed by a scavenging area or at the surface of the melt at which the clustered stream impacts.
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 |
|---|---|
| CA2283903A1 CA2283903A1 (en) | 1998-09-24 |
| CA2283903C true CA2283903C (en) | 2007-01-02 |
Family
ID=8166553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002283903A Expired - Fee Related CA2283903C (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 |
|---|---|---|---|---|
| DK2039785T3 (en) * | 2006-06-30 | 2011-08-15 | Techcom Gmbh | Method for steel pocket deoxidation |
| 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 EP EP97916364A patent/EP0968312B1/en not_active Expired - Lifetime
- 1997-03-17 DE DE59707243T patent/DE59707243D1/en not_active Expired - Lifetime
- 1997-03-17 AT AT97916364T patent/ATE217354T1/en not_active IP Right Cessation
- 1997-03-17 CA CA002283903A patent/CA2283903C/en not_active Expired - Fee Related
- 1997-03-17 ES ES97916364T patent/ES2174245T3/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0968312A1 (en) | 2000-01-05 |
| ATE217354T1 (en) | 2002-05-15 |
| ES2174245T3 (en) | 2002-11-01 |
| DE59707243D1 (en) | 2002-06-13 |
| EP0968312B1 (en) | 2002-05-08 |
| WO1998041658A1 (en) | 1998-09-24 |
| CA2283903A1 (en) | 1998-09-24 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20170317 |