CN109759575B - Annular gas curtain wall for steel ladle and argon blowing metallurgical method thereof - Google Patents
Annular gas curtain wall for steel ladle and argon blowing metallurgical method thereof Download PDFInfo
- Publication number
- CN109759575B CN109759575B CN201910126674.9A CN201910126674A CN109759575B CN 109759575 B CN109759575 B CN 109759575B CN 201910126674 A CN201910126674 A CN 201910126674A CN 109759575 B CN109759575 B CN 109759575B
- Authority
- CN
- China
- Prior art keywords
- ladle
- curtain wall
- argon
- air curtain
- ring
- 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.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to an annular air curtain wall for a steel ladle, which comprises an annular air curtain wall body (1), a dispersion type air permeable ring (2), an air chamber (3) and an air inlet pipe (4), wherein the dispersion type air permeable ring (2) is arranged in the annular air curtain wall body (1), the upper part of the dispersion type air permeable ring extends out of the upper surface of the annular air curtain wall body (1), the air chamber (3) is formed at the bottom of the dispersion type air permeable ring through a buried moulding bed at one time, the side part of the air chamber (3) is connected with the air inlet pipe (4), one end of the air inlet pipe is communicated with the air chamber, and the other end of the air inlet pipe extends out from the side part of the air curtain wall body (1).
Description
Technical Field
The invention relates to an annular gas curtain wall for a steel ladle and an argon blowing metallurgical method thereof, belonging to the technical field of argon blowing metallurgical technology of ferrous metallurgical steel ladles.
Background
In order to improve the cleanliness and the castability of molten steel, high-quality steel grades are developed, and steel enterprises need to adopt different external refining processes to further treat the molten steel after steelmaking. The refining time of high-quality steel is generally more than 40 minutes, wherein the later stage of ladle refining is generally subjected to soft blowing operation, namely, a molten pool is weakly stirred for more than 8 minutes by a certain small air amount so as to promote floating and removal of inclusions, and after soft blowing, molten steel also needs to be subjected to standing for 5-10 minutes to be capable of being lifted on a continuous casting rotary table for casting. However, the following problems or disadvantages exist in actual production: the refining time is long, so that the furnace and the machine are not matched, and the method becomes a limiting link for influencing the steelmaking productivity; because of the production rhythm requirements of many large-scale ferrosteel companies in China, enough soft blowing and standing time cannot be ensured, so that inclusions in molten steel cannot be effectively removed, and casting blank quality defects are caused.
Chinese patent document CN201070669Y (patent No. 200720151456.3) discloses an air curtain wall having a wall body made of a breathable material; the wall body links to each other with the air supply source, its characterized in that: the wall body is annular and is respectively arranged around each water gap of the tundish in a surrounding mode, and the wall body is connected with the compressed air supply source through connecting holes formed in the wall body. The method can economically solve the problem of completely air-washing the injected molten steel. The technology of the patent is insufficient: the wall body is prepared from a breathable material, has small volume density, low strength, no erosion resistance and low service life, and is difficult to be used for batch industrial production.
Chinese patent document CN104028739B (patent number: 201410274221.8) discloses a ladle ventilation water-feeding mouth pocket brick and a method for controlling ladle slag discharging by the ladle ventilation water-feeding mouth pocket brick, the ladle ventilation water-feeding mouth pocket brick comprises a water-feeding mouth pocket brick body, ventilation ceramic rods, an air chamber box and an air inlet pipe, wherein a steel flow hole and a water-feeding mouth mounting hole are formed in the middle of the water-feeding mouth pocket brick body from top to bottom, the inside of the water-feeding mouth pocket brick body is provided with annular ventilation ceramic rods and annular air chamber boxes which are uniformly arranged in a circular shape, the bottom of the air chamber box is connected with the air inlet pipe, argon is blown in from the air inlet pipe when molten steel in the ladle is at a low liquid level, and the problem of vortex slag rolling of the water-feeding mouth of the ladle is controlled. The patent is mainly aimed at inhibiting the slag rolling problem of a ladle nozzle at the end of ladle pouring. This patent suffers from the following disadvantages: argon bubbles formed by argon passing through the permeable ceramic are large and have small concentration, and argon is blown in only at the end of ladle pouring, so that the metallurgical function of removing impurities by blowing argon in the whole process is avoided.
Chinese patent document CN104525929a (patent No. 201410805369) discloses a method for controlling ladle slag discharge by argon blowing through a ladle bottom ring tap hole, wherein air bricks with a width of 50-300 mm are arranged around the ladle bottom tap hole, and argon is blown into the ladle through the annular air bricks when the height of the molten steel casting liquid level in the ladle is 150-400 mm. The patent is mainly aimed at the problem of inhibiting slag discharge of a ladle nozzle at the end of ladle pouring. This patent suffers from the following disadvantages: the structure of the annular air brick is not described in detail, argon is only blown in at the end of ladle pouring, and the metallurgical functions of whole argon blowing and inclusion floating promotion and removal are not achieved.
Chinese patent document CN107225231a (patent No. 201710575311.4) discloses a continuous casting tundish annular air curtain wall, including air curtain wall body (1), diffuse type ventilation ring (2), air chamber (3), intake pipe (4), the air curtain wall body is annular, its middle part is provided with cylindrical mounting hole, be provided with annular diffuse type ventilation ring (2) in air curtain wall body (1), the upper surface of air curtain wall body (1) is stretched out on diffuse type ventilation ring's upper portion, air chamber (3) shaping is in diffuse type ventilation ring's bottom, the lateral part of air chamber is connected with intake pipe (4), the one end and the air chamber intercommunication of intake pipe, the lateral part of air curtain wall body stretches out, intake connection metal pipe fitting (8) and outside argon gas source intercommunication, blow in the argon gas, form annular air curtain wall around last mouth seat brick, to the whole gas wash of molten steel that will get into the tundish upper mouth, the inclusion removal rate has been improved. The patent is mainly directed to the removal of inclusions in molten steel in a continuous casting tundish. The technology of the patent is insufficient: the diffuse type ventilation ring is formed by adopting a machine press, so that the ventilation uniformity is poor, the argon blowing metallurgical effect is influenced, the volume density is low, and the service life is influenced.
Disclosure of Invention
According to the invention, a dispersion type permeable ring is arranged in the annular air curtain wall body, argon is blown in the whole process in the casting process of the continuous casting ladle, according to the change of the net weight of molten steel in the ladle (the molten steel surface in the ladle), the argon flow is automatically regulated, tiny argon bubbles are formed through the dispersion type permeable ring, an annular air curtain barrier is formed around the ladle upper water port, the molten steel which is about to enter the ladle upper water port is subjected to air washing, the floating and removal of inclusions are promoted, and ladle slag tapping caused by confluence vortex and drainage sink is effectively inhibited in the later stage of ladle casting, meanwhile, the problem of molten steel slag rolling caused by untimely regulation of the argon blowing flow and blowing slag surface in the ladle is solved, and compared with the method for applying the molten steel casting allowance in the comparative example CN201070669Y (the patent number 200720151456.3), the electrolytic weight ratio of the continuous casting billet sample is reduced by more than 23%.
The utility model provides an annular air curtain wall for ladle, including annular air curtain wall body (1), diffuse type ventilative ring (2), air chamber (3), intake pipe (4), the cross section of annular air curtain wall body (1) is the ring, the middle part of annular air curtain wall body (1) is provided with mounting hole (5), be provided with diffuse type ventilative ring (2) in annular air curtain wall body (1), the upper surface of annular air curtain wall body (1) is stretched out on diffuse type ventilative ring's upper portion, air chamber (3) set up in diffuse type ventilative ring's bottom, the lateral part of air chamber (3) is connected with intake pipe (4), the one end and the air chamber intercommunication of intake pipe, the lateral part of other end follow air curtain wall body (1) stretches out. In the continuous casting ladle pouring process, the gas-permeable upper nozzle pocket brick of the ladle dispersion ring blows argon in the whole process, and has the two argon blowing metallurgical functions of purifying molten steel in the ladle and inhibiting the pouring slag of the ladle.
Preferably, the air chamber (3) is formed at the bottom of the dispersion type ventilation ring through embedding the tire mold.
The dispersive ventilation ring (2) is produced by taking high-purity corundum, mullite and the like as main raw materials and adopting an isostatic compaction and medium-temperature sintering process, and the volume density is more than or equal to 2.80g/cm 3 The air holes in the dispersion ring are uniformly and dispersedly distributed, argon gas permeates the dispersion type air-permeable ring to form continuous and uniformly distributed tiny argon bubbles (the diameter of the bubbles is smaller than 1mm measured by a water model experiment), which is superior to the wall body prepared by an air-permeable material in the Chinese patent document CN201070669Y (patent number: 200720151456.3), the technical problems of small volume density, low strength and low service life are solved, the corundum dispersion type air-permeable ring produced by machine press molding in the Chinese patent document CN107225231A (patent number 201710575311.4) is superior to the corundum dispersion type air-permeable ring produced by machine press molding, the quality defects of uneven air permeability, small volume density and the like of the dispersion type air-permeable ring produced by machine press molding are solved, the air-permeable ceramic rod is superior to the air-permeable ceramic rod described by the Chinese patent document CN104028739B (patent number: 201410274221.8), the performance defects of large diameter, small density and the like of the argon bubbles formed by the air-permeable ceramic rod are solved, and the casting allowance ratio of molten steel in a ladle is reduced by more than 7% compared with the steel casting in a ladle of the comparative example CN104028739B (patent number: 201410274221.8), and the casting weight of a continuous casting sample is reduced by more than 33%.
The isostatic compaction process is characterized in that a sample to be compacted is placed in a high-pressure container, the sample is uniformly pressurized from all directions by utilizing the incompressible property and the uniform pressure transmission property of a liquid medium, and when the liquid medium is injected into the pressure container through a pressure pump, the pressure intensity of the liquid medium is unchanged and uniformly transmitted to all directions according to the fluid mechanics principle. The powder in the high-pressure container is subjected to uniform and uniform pressure in all directions. The process of shaping the barren powder into a dense green body by the above process is referred to as isostatic pressing. The isostatic pressing process adopts the prior art.
Preferably, the height H of the annular air curtain wall body (1) is 150-250 mm.
Preferably, the annular air curtain retaining wall body (1) is formed by casting corundum castable, and the volume density is more than or equal to 3.0g/cm 3 The high-temperature flexural strength is more than or equal to 12Mpa, the high-temperature compressive strength is more than or equal to 80Mpa, and AL is the same as that of the alloy 2 O 3 The content is more than or equal to 92 percent, cr 2 O 3 The content is more than or equal to 2 percent.
In the invention, the cross section of the dispersion type ventilation ring (2) is in a circular shape, the longitudinal section of the dispersion type ventilation ring is in a right trapezoid shape, the width x of the lower part of the circular ring is 55-65 mm, the width y of the upper part of the dispersion type ventilation ring is 50-60 mm, and the height h of the dispersion type ventilation ring is 100-200 mm.
In the invention, preferably, the cross section of the middle mounting hole (5) of the dispersion type ventilation ring is circular, the diameter of the circle is matched with the diameter of a pocket block (7) sleeved on the ladle, and the diameter D2 of the lower circle is 2-3 mm larger than the diameter D1 of the upper circle, so that the demolding is facilitated.
In the invention, preferably, the height z of the upper end of the dispersion type ventilation ring (2) extending out of the upper surface of the annular air curtain retaining wall body (1) is 5-10 mm.
In the invention, preferably, the distance a between the lower end of the side wall of the dispersion type ventilation ring (2) and the side wall of the annular air curtain wall body (1) is 20-30 mm.
In the invention, the whole air chamber (3) is in a circular shape, the longitudinal section of the air chamber is in a semicircle shape, the radius R of the air chamber is 10-11 mm, the air chamber (3) is provided with an air inlet pipe mounting hole (6), and the diameter d of the air inlet pipe mounting hole is 12-13 mm. Preferably, the diameter d of the intake pipe mounting hole is 12mm.
According to the invention, the air inlet pipe (4) and the air inlet connecting metal pipe (9) are made of heat-resistant stainless steel round pipes, and the specification and the size are phi 12 multiplied by 1.3 (the outer diameter is 12mm, and the wall thickness is 1.3 mm).
The invention relates to a dispersion type ventilation ring for an annular air curtain wall of a steel ladle, which is produced by adopting an isostatic pressing process, wherein the width x of the lower part is 55-65 mm, the width y of the upper part is 50-60 mm, the height h is 100-200 mm, the height z of the upper end of the dispersion type ventilation ring, which extends out of the upper surface of the annular air curtain wall body (1), is 5-10 mm and the like, and is based on the task of the invention: the method improves the ventilation uniformity and the argon bubble density of the dispersion type ventilation ring, improves the capability of capturing and removing impurities of the argon bubbles, inhibits ladle slag discharge caused by confluence vortex and drainage sink, is convenient for positioning the dispersion type ventilation ring accurately, realizes synchronous and specific selection of the dispersion type ventilation ring and the service life of a body, is obtained by a large number of water model experimental researches and production test groping by a person in the field, wherein the dispersion type ventilation ring is produced by adopting an isostatic compaction process, solves the quality defects of uneven ventilation, small volume density and the like of the dispersion type ventilation ring produced by the traditional machine compaction, ensures that the argon gas forms continuous and dense tiny argon bubbles through the dispersion type ventilation ring, enables the argon bubbles to move upwards all, forms an annular air curtain barrier around a ladle upper water gap, carries out air washing on molten steel which is about to enter the ladle upper water gap, promotes the floating and removal of the impurities, effectively inhibits ladle slag discharge caused by confluence vortex and drainage sink in the later stage of ladle casting, not only improves the cleanliness of molten steel, but also reduces the molten steel pouring allowance in the ladle; the width design of the dispersion type ventilation ring is set according to comprehensive study and setting of the inclusion removal effect of the ventilation ring with different widths, the water model experiment research result of the critical height for generating vortex, the positioning space size requirement and the molding quality requirement, and the height design of the dispersion type ventilation ring is set based on the erosion residual thickness dimension of the ladle lower line small repair measuring ladle upper nozzle pocket brick body and the dispersion type ventilation ring so as to ensure the service life synchronization of the dispersion type ventilation ring, the ladle upper nozzle pocket brick body and the ladle slag line working lining; the upper end of the dispersion type ventilation ring extends out of the upper surface of the ladle upper nozzle pocket brick body, so that the positioning difficulty of the dispersion type ventilation ring in the casting production of the ladle dispersion type ventilation ring ventilation upper nozzle pocket brick is solved.
According to the installation method of the annular air curtain wall for the steel ladle, the steel ladle upper nozzle pocket brick (7) is installed in the prior art, corundum fire clay with the thickness of 10-15 mm is smeared on the outer wall of the steel ladle upper nozzle pocket brick (7), the installation hole (5) of the steel ladle annular air curtain wall is sleeved on the upper portion of the outer wall (7) of the steel ladle upper nozzle pocket brick, the upper surface of the steel ladle annular air curtain wall body (1) is enabled to be level with the working surface of the steel ladle bottom working lining (12), one end of an air inlet connection metal pipe (8) is connected with an air inlet pipe (4), the other end of the air inlet connection metal pipe penetrates out of the ladle bottom of a steel ladle cladding (9), then the steel ladle upper nozzle pocket brick is cast and filled up by adopting steel ladle working lining casting materials, and the installation of the steel ladle annular air curtain wall is completed.
The steel ladle working lining castable is corundum-spinel castable produced by the prior art.
The invention also provides an argon blowing metallurgical device utilizing the annular air curtain wall of the ladle, which is characterized in that a set of argon pipeline system and an electrical control system are arranged on argon flow control, a weighing signal of molten steel in the ladle is introduced, and the argon flow is linearly regulated according to the change of the net weight of the molten steel in the ladle, so that the problem of molten steel slag coiling caused by untimely regulation of the argon blowing flow and blowing of the slag surface of the molten steel under the condition that the liquid level of the molten steel in the ladle is continuously reduced is solved.
The argon gas pipeline system is divided into a main blowing branch and a manual bypass, as shown in fig. 6, wherein the main blowing branch comprises a first ball valve 14a, a gas filter 15, a first pressure gauge 16a, a second ball valve 14b, a pressure transmitter 17, a solenoid valve 18, a metallurgical special mass flow controller 19, a one-way valve 20, a second pressure gauge 16b, a pressure reducing valve 21 and a third ball valve 14c, the manual bypass comprises a fourth ball valve 14d and a manual regulating valve 22, the front end of the manual bypass is arranged between the first pressure gauge 16a and the second ball valve 14b, and the tail end of the manual bypass is arranged between the one-way valve 20 and the second pressure gauge 16b and is connected in parallel with the second ball valve 14b, the pressure transmitter 17, the solenoid valve 18, the metallurgical special mass flow controller 19 and the one-way valve 20 of the main blowing branch; the automatic pressure compensation device is used for manual operation application after a main blowing branch breaks down, a pipeline element connection relation is achieved, an argon pipeline system is positioned in a control cabinet, a pressure transmitter 17 and a pressure reducing valve 21 in the argon pipeline system have a mechanical and electronic double pressure automatic compensation function, inlet pressure fluctuates randomly, outlet pressure is self-adaptive, and the influence of back pressure disturbance is avoided.
The electric control system comprises an argon blowing control system PLC, a touch screen, an upper computer operating system, a network switch and a continuous casting foundation automation system, wherein each system is connected with the network switch through Ethernet communication, a molten steel weighing system in a ladle collects and sends molten steel weight in the ladle to the continuous casting foundation automation system, and the molten steel weight is uploaded to the argon blowing control system PLC through Ethernet communication and the network switch, as shown in fig. 7. Those skilled in the art may choose from actual needs or use prior art control systems.
The argon blowing control system PLC collects the pressure value of the first pressure gauge (16 a), the flow value of the special metallurgical mass flow controller (19), the pressure value of the second pressure gauge (16 b) and the weight value of molten steel in the ladle, executes an argon flow automatic control instruction of the argon blowing control system PLC, and automatically adjusts the argon flow according to the change of the net weight of molten steel in the ladle.
The invention also provides an argon blowing metallurgical method utilizing the annular air curtain wall of the ladle, which comprises the following steps:
firstly, receiving a ladle casting signal, starting argon blowing, wherein the initial argon flow is set to be the argon blowing flow determined by soft blowing of the ladle, and is generally 60-120NL/min;
in the second step, in the ladle pouring process, according to the change of the net weight of molten steel in the ladle, the argon flow is linearly regulated, and the set value of the argon flow in the process = the net weight of the residual molten steel in the ladle/(the net weight of molten steel when the ladle is full/(the initial argon flow when the ladle is full);
thirdly, manually judging that the ladle is in slag or slag detection system alarm, and receiving a ladle stop signal to stop blowing argon into the annular gas curtain wall of the ladle.
The invention has the beneficial effects that:
1) According to the invention, the annular air curtain retaining wall body of the ladle is internally provided with the dispersion type permeable ring, the argon flow control is provided with the argon pipeline system and the electrical control system, argon is blown in the whole process in the continuous casting ladle pouring process, according to the change of the net weight of molten steel in the ladle, the argon flow is automatically regulated, tiny argon bubbles are formed by the argon through the dispersion type permeable ring, most of the argon bubbles move upwards, an annular air curtain barrier is formed around the upper water gap of the ladle, the molten steel which is about to enter the upper water gap of the ladle is subjected to air washing, the floating and removal of inclusions are promoted, the ladle slag falling caused by confluence vortex and drainage sink is effectively inhibited at the later stage of ladle pouring, the problem of molten steel slag rolling caused by untimely regulation of argon blowing flow and blowing slag surface in the ladle is solved, the cleanliness of molten steel is improved, the molten steel pouring allowance of the molten steel in the ladle is reduced, and the invention is compared with the application of comparative example CN201070669Y (patent number: 200720151456.3) the molten steel pouring quantity in the ladle is reduced by more than 17%, and the electrolytic inclusion weight of the continuous casting billet sample is reduced by more than 23%.
2) The dispersive ventilation ring provided by the invention has the height h of 100-200 mm, is produced by adopting an isostatic compaction process by taking high-purity corundum, mullite and the like as main raw materials, and has the volume density of more than or equal to 2.80g/cm 3 The air holes in the dispersion ring are uniformly and dispersedly distributed, argon gas permeates the dispersion type air-permeable ring to form continuous and uniformly distributed tiny argon bubbles (the diameter of the bubbles is smaller than 1mm measured by a water mould experiment), which is superior to the dispersion type air-permeable ring produced by mechanical press molding in China patent document CN107225231A (patent No. 201710575311.4), the quality defects of uneven air permeability, small volume density and the like of the dispersion type air-permeable ring produced by mechanical press molding are overcome, the air-permeable ceramic rod is superior to the air-permeable ceramic rod in China patent document CN104028739B (patent No. 201410274221.8), and the defect of small argon bubble concentration and the like formed by the argon gas permeating the air-permeable ceramic rod is overcome, so that the invention further improves the effect of blowing argon bubbles with tiny argon bubbles to drive inclusion to float upwards and remove and the function of inhibiting ladle slag from confluence vortex and drainage sink, and the casting allowance of molten steel in the ladle is reduced by more than 7% by the same ratio in comparison of the steel ladle of the comparative example CN104028739B (patent No. 201410274221.8), and the electrolytic inclusion of a continuous casting sample is reduced by more than 33% by the same ratio.
Drawings
Fig. 1 is a schematic cross-sectional view of a steel ladle annular air curtain wall structure A-A according to an embodiment of the present invention.
Fig. 2 is a schematic top view of a ladle annular air curtain wall structure according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a diffuse-type air-permeable ring according to an embodiment of the present invention.
Fig. 4 is a schematic view of the installation of the annular curtain wall of the ladle in the embodiment of the invention.
Fig. 5 is an enlarged view of a portion of an installation of a ladle annular curtain wall in accordance with an embodiment of the present invention.
FIG. 6 is a schematic diagram of an argon piping system in an embodiment of the invention.
Fig. 7 is a schematic diagram of electrical connection in an embodiment of the present invention.
In the figure, 1, a ladle annular air curtain retaining wall body; 2. a diffusion-type ventilation ring; 3. a gas chamber; 4. an air inlet pipe; 5. a mounting hole; 6. an air inlet pipe mounting hole; 7. ladle upper nozzle pocket block; 8. the air inlet is connected with the metal pipe; 9. ladle cladding; 10. a pit is arranged on a ladle upper nozzle pocket block; 11. a ladle permanent lining; 12. ladle working lining casting material; 13. ladle working slag lining line bricks; 14. ball valves (including a first ball valve 14a, a second ball valve 14b, a third ball valve 14c, a fourth ball valve 14 d); 15. a gas filter; 16. pressure gauges (including first pressure gauge 16a, first pressure gauge 16 b); 17. a pressure transmitter; 18. an electromagnetic valve; 19. a mass flow controller dedicated to metallurgy; 20. a one-way valve; 21. a pressure reducing valve; 22. and a manual adjusting valve.
Detailed Description
The invention is further illustrated, but not limited to, by the following examples and figures. The invention, not described in detail, may be employed in any of the prior art.
Example 1:
an annular air curtain wall for a steel ladle is shown in fig. 1, 2 and 3 and comprises an annular air curtain wall body 1, a diffusion type ventilation ring 2, an air chamber 3 and an air inlet pipe 4, wherein the cross section of the annular air curtain wall body 1 is circular, a mounting hole 5 is formed in the middle of the annular air curtain wall body, the diffusion type ventilation ring 2 is arranged in the annular air curtain wall body 1, the upper part of the diffusion type ventilation ring extends out of the upper surface of the annular air curtain wall body 1, the air chamber 3 is formed at the bottom of the diffusion type ventilation ring through a buried tire mold in one step, the side part of the air chamber 3 is connected with the air inlet pipe 4, one end of the air inlet pipe is communicated with the air chamber, and the other end of the air inlet pipe extends out from the side part of the air curtain wall body 1.
The dispersive ventilation ring 2 is produced by taking high-purity corundum, mullite and the like as main raw materials and adopting an isostatic compaction and medium-temperature sintering process, and has the volume density of more than or equal to 2.80g/cm 3 The air holes in the dispersion ring are uniformly and dispersedly distributed, argon gas permeates the dispersion type air-permeable ring to form continuous and uniformly distributed tiny argon bubbles (the diameter of the bubbles is smaller than 1mm measured by a water model experiment), which is superior to the wall body prepared by an air-permeable material in the Chinese patent document CN201070669Y (patent number: 200720151456.3), the technical problems of small volume density, low strength and low service life are solved, the corundum dispersion type air-permeable ring produced by machine press molding in the Chinese patent document CN107225231A (patent number 201710575311.4) is superior to the corundum dispersion type air-permeable ring produced by machine press molding, the quality defects of uneven air permeability, small volume density and the like of the dispersion type air-permeable ring produced by machine press molding are solved, the air-permeable ceramic rod is superior to the air-permeable ceramic rod described by the Chinese patent document CN104028739B (patent number: 201410274221.8), the performance defects of large diameter, small density and the like of the argon bubbles formed by the air-permeable ceramic rod are solved, and the casting allowance ratio of molten steel in a ladle is reduced by more than 19% compared with the steel casting in a ladle of the comparative example CN104028739B (patent number: 201410274221.8), and the weight ratio of a continuous casting sample is reduced by more than 23%.
The height H of the annular air curtain wall body 1 is 150mm.
The annular air curtain retaining wall body 1 is formed by casting corundum castable, and the volume density is more than or equal to 3.0g/cm 3 The high-temperature flexural strength is more than or equal to 12Mpa, the high-temperature compressive strength is more than or equal to 80Mpa, and AL is the same as that of the alloy 2 O 3 The content is more than or equal to 92 percent, cr 2 O 3 The content is more than or equal to 2 percent.
The cross section of the dispersion type ventilation ring 2 is in a circular ring shape, the longitudinal section of the dispersion type ventilation ring is in a right trapezoid shape, the width x of the lower part of the circular ring is 55mm, the width y of the upper part of the circular ring is 50mm, and the height h of the circular ring is 100mm.
The middle mounting hole 5 of the dispersion type ventilation ring is circular in cross section, the diameter of the circle is matched with the diameter of the pocket block 7 sleeved on the ladle, the diameter D2 of the lower part is 2mm larger than the diameter D1 of the upper part, and demolding is facilitated.
The upper end of the dispersion type ventilation ring 2 extends out of the upper surface of the annular air curtain wall body 1 to a height z of 5mm.
The distance a between the lower end of the side wall of the dispersion type ventilation ring 2 and the side wall of the annular air curtain wall body 1 is 25mm.
The whole air chamber 3 is circular, the longitudinal section of the air chamber is semicircular, the radius R of the air chamber is 10mm, the air chamber 3 is provided with an air inlet pipe mounting hole 6, and the diameter d of the air inlet pipe mounting hole is 12mm.
The air inlet pipe 4 and the air inlet connecting metal pipe 8 are made of heat-resistant stainless steel round pipes, and have specification and dimension phi 12 multiplied by 1.3 (the outer diameter is 12mm, and the wall thickness is 1.3 mm).
The installation of the annular air curtain retaining wall for the steel ladle adopts the prior art to install a steel ladle upper nozzle pocket brick 7, 10mm thick corundum fire clay is smeared on the outer wall of the steel ladle upper nozzle pocket brick 7, the installation hole 5 of the steel ladle annular air curtain retaining wall is sleeved on the upper part of the outer wall 7 of the steel ladle upper nozzle pocket brick, the upper surface of the steel ladle annular air curtain retaining wall body 1 is enabled to be flush with the working surface of a steel ladle bottom working lining 12, one end of an air inlet connection metal pipe 8 is connected with an air inlet pipe 4, the other end of the air inlet connection metal pipe penetrates out of the bottom of a steel ladle cladding 9, then the steel ladle working lining castable 12 is adopted to pour and level up the steel ladle upper nozzle pocket brick installation pit 10, so as to finish the installation of the steel ladle annular air curtain retaining wall, and after the steel ladle seat is arranged on a large ladle rotary table of a continuous casting machine, the air inlet connection metal pipe 8 is communicated with an argon gas source.
The steel ladle working lining castable is corundum-spinel castable produced by the prior art.
The annular air curtain retaining wall argon blowing metallurgical device for the steel ladle is characterized in that a set of argon pipeline system and an electrical control system are arranged on argon flow control, a molten steel weighing signal in the steel ladle is introduced, and the argon flow is linearly regulated according to the change of the net weight of molten steel in the steel ladle, so that the problem of molten steel slag coiling caused by untimely regulation of the argon blowing flow and blowing of the molten steel slag surface under the condition that the molten steel level in the steel ladle is continuously reduced is solved.
The argon gas pipeline system is divided into a main blowing branch and a manual bypass, as shown in fig. 6, wherein the main blowing branch comprises a first ball valve 14a, a gas filter 15, a first pressure gauge 16a, a second ball valve 14b, a pressure transmitter 17, a solenoid valve 18, a metallurgical special mass flow controller 19, a one-way valve 20, a second pressure gauge 16b, a pressure reducing valve 21 and a third ball valve 14c, the manual bypass comprises a fourth ball valve 14d and a manual regulating valve 22, the front end of the manual bypass is arranged between the first pressure gauge 16a and the second ball valve 14b, and the tail end of the manual bypass is arranged between the one-way valve 20 and the second pressure gauge 16b and is connected in parallel with the second ball valve 14b, the pressure transmitter 17, the solenoid valve 18, the metallurgical special mass flow controller 19 and the one-way valve 20 of the main blowing branch; the automatic pressure compensation device is used for manual operation application after a main blowing branch breaks down, a pipeline element connection relation is achieved, an argon pipeline system is positioned in a control cabinet, a pressure transmitter 17 and a pressure reducing valve 21 in the argon pipeline system have a mechanical and electronic double pressure automatic compensation function, inlet pressure fluctuates randomly, outlet pressure is self-adaptive, and the influence of back pressure disturbance is avoided.
The electric control system comprises an argon blowing control system PLC, a touch screen, an upper computer operating system, a network switch and a continuous casting foundation automation system, wherein each system is connected with the network switch through Ethernet communication, a molten steel weighing system in a ladle collects and sends molten steel weight in the ladle to the continuous casting foundation automation system, and the molten steel weight is uploaded to the argon blowing control system PLC through Ethernet communication and the network switch, as shown in fig. 7. Those skilled in the art may choose from actual needs or use prior art control systems.
The argon blowing control system PLC collects the pressure value of the first pressure gauge (16 a), the flow value of the special metallurgical mass flow controller (19), the pressure value of the second pressure gauge (16 b) and the weight value of molten steel in the ladle, executes an argon flow automatic control instruction of the argon blowing control system PLC, and automatically adjusts the argon flow according to the change of the net weight of molten steel in the ladle.
The argon blowing metallurgical method for utilizing the annular air curtain wall of the ladle comprises the following steps: the argon flow automatic control instruction of the argon blowing control system PLC is as follows:
firstly, receiving a ladle casting signal, starting argon blowing, wherein the initial argon flow is set to be 60NL/min as determined by ladle soft blowing;
in the second step, in the ladle pouring process, according to the change of the net weight of molten steel in the ladle, the argon flow is linearly regulated, and the set value of the argon flow in the process = the net weight of the residual molten steel in the ladle/(the net weight of molten steel when the ladle is full/(the initial argon flow when the ladle is full);
for example, the net weight of molten steel at the time of filling the ladle is 130 tons, and when the net weight of molten steel remaining in the ladle is 65 tons, the process argon flow set value=65++130×60 NL/min=30 NL/min.
Thirdly, manually judging that the ladle is in slag or slag detection system alarm, and receiving a ladle stop signal to stop blowing argon into the annular gas curtain wall of the ladle.
The argon gas pipeline system components are all purchased in the market, wherein the type specification of the ball valve 14 (comprising a first ball valve 14a, a second ball valve 14b, a third ball valve 14c and a fourth ball valve 14 d) is 304SS-1/2, the type specification of the gas filter 15 is BK110-3, the type specification of the pressure gauge 16 (comprising a first pressure gauge 16a and a first pressure gauge 16 b) is YT40, the type specification of the pressure transmitter 14 is 8323-25-G1/2, the type specification of the electromagnetic valve 18 is 5281-1/2-NBR, the type specification of the special metallurgical mass flow controller 19 is Flox (on) s, the measuring range is 0-200NL/min, the type specification of the pressure reducing valve 21 is BK100-2, and the type specification of the manual regulating valve 22 is 28-1/2-MS.
The electric control system components are all purchased in the market, wherein the model specification of the PLC control system is Siemens S7 series, the model specification of the PLC analog module is 4AI/2AO, the model specification of the touch screen is Siemens 7 inch touch screen, the model specification of the upper computer operating system is D610, and the upper computer software WIN CC is more than 6.0.
EXAMPLE 2,
The annular gas curtain wall of the ladle of example 1, except that:
the height H of the annular air curtain wall body 1 is 250mm.
The cross section of the dispersion type ventilation ring 2 is in a circular ring shape, the longitudinal section of the dispersion type ventilation ring is in a right trapezoid shape, the width x of the lower part of the circular ring is 65mm, the width y of the upper part of the circular ring is 60mm, and the height h of the circular ring is 200mm.
The height z of the upper end of the dispersion type ventilation ring 2 extending out of the upper surface of the annular air curtain wall body 1 is 10mm.
The distance a between the lower end of the side wall of the dispersion type ventilation ring 2 and the side wall of the annular air curtain wall body 1 is 20mm.
The argon flow automatic control instruction of the argon blowing control system PLC is as follows:
firstly, receiving a ladle casting signal, starting argon blowing, wherein the initial argon flow is set to be 120NL/min as determined by ladle soft blowing;
in the second step, in the ladle pouring process, according to the change of the net weight of molten steel in the ladle, the argon flow is linearly regulated, and the set value of the argon flow in the process = the net weight of the residual molten steel in the ladle/(the net weight of molten steel when the ladle is full/(the initial argon flow when the ladle is full);
for example, the net weight of molten steel at the time of filling the ladle is 130 tons, and when the net weight of molten steel remaining in the ladle is 26 tons, the process argon flow set value=26++130×120 NL/min=24 NL/min.
Thirdly, manually judging that the ladle is in slag or slag detection system alarm, and receiving a ladle stop signal to stop blowing argon into the annular gas curtain wall of the ladle.
EXAMPLE 3,
The annular air curtain wall for a ladle as claimed in embodiment 1, except that:
the height H of the annular air curtain wall body 1 is 200mm.
The cross section of the dispersion type ventilation ring 2 is in a circular ring shape, the longitudinal section of the dispersion type ventilation ring is in a right trapezoid shape, the width x of the lower part of the circular ring is 60mm, the width y of the upper part of the circular ring is 55mm, and the height h of the circular ring is 160mm.
The upper end of the dispersion type ventilation ring 2 extends out of the upper surface of the annular air curtain wall body 1, and the height z of the upper end of the dispersion type ventilation ring is 7mm.
The distance a between the lower end of the side wall of the dispersion type ventilation ring 2 and the side wall of the annular air curtain wall body 1 is 30mm.
The argon flow automatic control instruction of the argon blowing control system PLC is as follows:
firstly, receiving a ladle casting signal, starting argon blowing, wherein the initial argon flow is set to be 100NL/min as the argon blowing flow determined by ladle soft blowing;
in the second step, in the ladle pouring process, according to the change of the net weight of molten steel in the ladle, the argon flow is linearly regulated, and the set value of the argon flow in the process = the net weight of the residual molten steel in the ladle/(the net weight of molten steel when the ladle is full/(the initial argon flow when the ladle is full);
for example, the net weight of molten steel at the time of filling the ladle is 130 tons, and when the net weight of molten steel remaining in the ladle is 13 tons, the process argon flow set value=13++130×100 NL/min=10 NL/min.
Thirdly, manually judging that the ladle is in slag or slag detection system alarm, and receiving a ladle stop signal to stop blowing argon into the annular gas curtain wall of the ladle.
Comparative experimental example
Comparative example 1: chinese patent document CN201070669Y (patent No. 200720151456.3) discloses an air curtain wall.
Comparative example 2: chinese patent document CN104028739B (patent number: 201410274221.8) discloses a ladle ventilation nozzle pocket block and a method for controlling ladle slag tapping.
The annular air curtain wall for the steel ladle of the embodiment 1-3 is compared with the air curtain wall of the comparative example 1 and the ladle nozzle pocket brick of the comparative example 2 in terms of molten steel casting allowance in the steel ladle for producing the ultra-low carbon DC04 grade cold-rolled steel strip in a certain factory, large sample electrolytic samples are respectively taken at 1/4 of casting blank, round bars with the diameter of 60mm and the height of 100mm are processed, and large sample electrolytic inclusion detection comparison is carried out, so that the results are shown in the following table 1.
TABLE 1
By comparing the data in the table 1, the molten steel pouring allowance in the ladle of the invention is reduced by more than 17% in the same ratio compared with the ladle of the comparative example CN201070669Y (patent number: 200720151456.3), the electrolytic inclusion weight of the continuous casting billet sample is reduced by more than 23% in the same ratio, the molten steel pouring allowance in the ladle of the invention is reduced by more than 7% in the same ratio compared with the ladle of the comparative example CN104028739B (patent number: 201410274221.8), the electrolytic inclusion weight of the continuous casting billet sample is reduced by more than 33%, and the production and application results show that the annular air curtain retaining wall for the ladle has the two argon blowing metallurgical functions of purifying molten steel in the ladle and inhibiting ladle pouring slag.
Claims (8)
1. The annular air curtain wall for the steel ladle is characterized by comprising an annular air curtain wall body (1), a diffuse-type air permeable ring (2), an air chamber (3) and an air inlet pipe (4), wherein the cross section of the annular air curtain wall body (1) is circular, a mounting hole (5) is formed in the middle of the annular air curtain wall body (1), the diffuse-type air permeable ring (2) is arranged in the annular air curtain wall body (1), the upper part of the diffuse-type air permeable ring extends out of the upper surface of the annular air curtain wall body (1), the air chamber (3) is arranged at the bottom of the diffuse-type air permeable ring, the side part of the air chamber (3) is connected with the air inlet pipe (4), one end of the air inlet pipe is communicated with the air chamber, and the other end of the air inlet pipe extends out of the side part of the air curtain wall body (1);
the dispersive ventilation ring (2) is produced by adopting isostatic compaction and medium-temperature sintering processes by taking high-purity corundum and mullite as main raw materials, and the volume density is more than or equal to 2.80g/cm 3 The ventilation holes in the dispersion ring are uniformly and dispersedly distributed, argon gas penetrates through the dispersion ventilation ring to form continuous and uniformly distributed tiny argon bubbles, and the diameter of the bubbles is smaller than 1mm through water model experiment measurement;
the cross section of the dispersion type ventilation ring (2) is in a circular shape, the longitudinal section of the dispersion type ventilation ring is in a right trapezoid shape, the width x of the lower part of the circular ring is 55-65 mm, the width y of the upper part of the circular ring is 50-60 mm, and the height h of the circular ring is 100-200 mm; the height z of the upper end of the dispersion type ventilation ring (2) extending out of the upper surface of the annular air curtain retaining wall body (1) is 5-10 mm; the distance a between the lower end of the side wall of the dispersion type ventilation ring (2) and the side wall of the annular air curtain retaining wall body (1) is 20-30 mm.
2. An annular air curtain wall according to claim 1, characterized in that the air chamber (3) is formed in one piece in the bottom of the dispersive air permeable ring by means of an embedded moulding bed.
3. The annular air curtain wall according to claim 1, characterized in that the height H of the annular air curtain wall body (1) is 150-250 mm;
the annular air curtain retaining wall body (1) is formed by casting corundum castable, and the volume density is more than or equal to 3.0g/cm 3 The high-temperature flexural strength is more than or equal to 12Mpa, the high-temperature compressive strength is more than or equal to 80Mpa, and AL is the same as that of the alloy 2 O 3 The content is more than or equal to 92 percent, cr 2 O 3 The content is more than or equal to 2 percent.
4. The annular air curtain wall according to claim 1, wherein the middle mounting hole (5) of the dispersion type air permeable ring is circular in cross section, the diameter of the circle is matched with the diameter of a pocket block (7) sleeved on the ladle, and the diameter D2 of the lower circle is 2-3 mm larger than the diameter D1 of the upper circle, so that the mold release is facilitated.
5. The annular air curtain wall according to claim 1, wherein the air chamber (3) is in a circular shape as a whole, the longitudinal section of the air chamber is in a semicircle shape, the radius R of the air chamber is 10-11 mm, the air chamber (3) is provided with an air inlet pipe mounting hole (6), and the diameter d of the air inlet pipe mounting hole is 12-13 mm.
6. The annular air curtain wall according to claim 5, wherein the diameter d of the air inlet tube mounting hole is 12mm.
7. The method of installing an annular air curtain wall as claimed in any one of claims 1 to 6, comprising the steps of:
(1) Installing a ladle upper nozzle pocket block (7),
(2) Coating corundum fire clay with the thickness of 10-15 mm on the outer wall of a ladle upper nozzle pocket brick (7), sleeving a mounting hole (5) of a ladle annular air curtain wall on the upper part of the outer wall of the ladle upper nozzle pocket brick so that the upper surface of a ladle annular air curtain wall body (1) is level with the working surface of a ladle bottom working liner (12),
(3) One end of an air inlet connecting metal pipe (8) is connected with an air inlet pipe (4), the other end of the air inlet connecting metal pipe penetrates out of the ladle bottom of a ladle cladding (9),
(4) Pouring and filling up a ladle upper nozzle pocket brick installation pit (10) by adopting ladle working lining casting materials, so as to finish the installation of the ladle annular air curtain retaining wall,
(5) And after the ladle holder reaches the ladle turret of the continuous casting machine, communicating the air inlet connecting metal pipe (8) with an argon gas source.
8. An argon blowing metallurgical method using the annular air curtain wall of any one of claims 1-6, arranging a set of argon pipeline system and an electrical control system on argon flow control, introducing a weighing signal of molten steel in a ladle, and linearly adjusting the argon flow according to the change of the net weight of molten steel in the ladle, comprising the following steps:
firstly, receiving a ladle casting signal, starting argon blowing, wherein the initial argon flow is set to be the argon blowing flow determined by soft blowing of the ladle, and is generally 60-120NL/min;
in the second step, in the ladle pouring process, according to the change of the net weight of molten steel in the ladle, the argon flow is linearly regulated, and the set value of the argon flow in the process = the net weight of the residual molten steel in the ladle/(the net weight of molten steel when the ladle is full/(the initial argon flow when the ladle is full);
thirdly, manually judging that the ladle is in slag or slag detection system alarm, and receiving a ladle stop signal to stop blowing argon into the annular gas curtain wall of the ladle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910126674.9A CN109759575B (en) | 2019-02-20 | 2019-02-20 | Annular gas curtain wall for steel ladle and argon blowing metallurgical method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910126674.9A CN109759575B (en) | 2019-02-20 | 2019-02-20 | Annular gas curtain wall for steel ladle and argon blowing metallurgical method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109759575A CN109759575A (en) | 2019-05-17 |
| CN109759575B true CN109759575B (en) | 2023-08-25 |
Family
ID=66457059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910126674.9A Active CN109759575B (en) | 2019-02-20 | 2019-02-20 | Annular gas curtain wall for steel ladle and argon blowing metallurgical method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109759575B (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004322119A (en) * | 2003-04-22 | 2004-11-18 | Jfe Steel Kk | Fountain for continuous casting |
| JP2006061943A (en) * | 2004-08-26 | 2006-03-09 | Kurosaki Harima Corp | Molten metal discharging nozzle having function for jetting gas |
| EP2025431A1 (en) * | 2007-08-17 | 2009-02-18 | LLC "TMT" Peresechenie Logoiskiy tr&MKAD | Device for metal refining in the pony ladle |
| EP2255904A1 (en) * | 2009-05-27 | 2010-12-01 | Calderys France | Refractory purging porous block |
| CN104028740A (en) * | 2014-06-18 | 2014-09-10 | 莱芜钢铁集团有限公司 | Upper pocket block for argon blowing of continuous casting tundish and mounting method and application of upper pocket block |
| CN104028739A (en) * | 2014-06-18 | 2014-09-10 | 莱芜钢铁集团有限公司 | Ladle gas-permeable upper nozzle pocket block and nozzle slag entrapment control method implemented by same |
| CN203901511U (en) * | 2014-06-19 | 2014-10-29 | 武汉钢铁(集团)公司 | Converter leakage prevention liquid taping hole tubing brick isostatic pressure forming die |
| CN106041045A (en) * | 2016-08-04 | 2016-10-26 | 山东钢铁股份有限公司 | Continuous casting tundish diffuse-type gas-permeable ring upper nozzle brick cup and argon blowing refining method thereof |
| JP2017064778A (en) * | 2015-10-02 | 2017-04-06 | 新日鐵住金株式会社 | Upper nozzle for continuous casting |
| CN106631050A (en) * | 2015-11-05 | 2017-05-10 | 洛阳轩石高温材料有限公司 | Cleaning-free air brick with uniform structure and manufacturing method thereof |
| CN106670445A (en) * | 2016-12-12 | 2017-05-17 | 山东钢铁股份有限公司 | Argon-blowing refining device for continuous casting tundish and argon control method |
| CN107225231A (en) * | 2017-07-14 | 2017-10-03 | 山东钢铁股份有限公司 | A kind of annular air curtain barricade wall of continuous casting production and its molten steel air purge method |
| CN107321945A (en) * | 2017-07-14 | 2017-11-07 | 山东钢铁股份有限公司 | A kind of method of purging upper nozzle for continuous casting tundish brick cup Argon removal of inclusions |
| CN206966634U (en) * | 2017-07-25 | 2018-02-06 | 河钢股份有限公司邯郸分公司 | A kind of improved ladle upper nozzle brick cup |
| CN108273987A (en) * | 2018-04-09 | 2018-07-13 | 东北大学 | A kind of ladle ventilating filling pipe end brick cup and its method for controlling ladle roughing slag |
-
2019
- 2019-02-20 CN CN201910126674.9A patent/CN109759575B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004322119A (en) * | 2003-04-22 | 2004-11-18 | Jfe Steel Kk | Fountain for continuous casting |
| JP2006061943A (en) * | 2004-08-26 | 2006-03-09 | Kurosaki Harima Corp | Molten metal discharging nozzle having function for jetting gas |
| EP2025431A1 (en) * | 2007-08-17 | 2009-02-18 | LLC "TMT" Peresechenie Logoiskiy tr&MKAD | Device for metal refining in the pony ladle |
| EP2255904A1 (en) * | 2009-05-27 | 2010-12-01 | Calderys France | Refractory purging porous block |
| CN104028740A (en) * | 2014-06-18 | 2014-09-10 | 莱芜钢铁集团有限公司 | Upper pocket block for argon blowing of continuous casting tundish and mounting method and application of upper pocket block |
| CN104028739A (en) * | 2014-06-18 | 2014-09-10 | 莱芜钢铁集团有限公司 | Ladle gas-permeable upper nozzle pocket block and nozzle slag entrapment control method implemented by same |
| CN203901511U (en) * | 2014-06-19 | 2014-10-29 | 武汉钢铁(集团)公司 | Converter leakage prevention liquid taping hole tubing brick isostatic pressure forming die |
| JP2017064778A (en) * | 2015-10-02 | 2017-04-06 | 新日鐵住金株式会社 | Upper nozzle for continuous casting |
| CN106631050A (en) * | 2015-11-05 | 2017-05-10 | 洛阳轩石高温材料有限公司 | Cleaning-free air brick with uniform structure and manufacturing method thereof |
| CN106041045A (en) * | 2016-08-04 | 2016-10-26 | 山东钢铁股份有限公司 | Continuous casting tundish diffuse-type gas-permeable ring upper nozzle brick cup and argon blowing refining method thereof |
| CN106670445A (en) * | 2016-12-12 | 2017-05-17 | 山东钢铁股份有限公司 | Argon-blowing refining device for continuous casting tundish and argon control method |
| CN107225231A (en) * | 2017-07-14 | 2017-10-03 | 山东钢铁股份有限公司 | A kind of annular air curtain barricade wall of continuous casting production and its molten steel air purge method |
| CN107321945A (en) * | 2017-07-14 | 2017-11-07 | 山东钢铁股份有限公司 | A kind of method of purging upper nozzle for continuous casting tundish brick cup Argon removal of inclusions |
| CN206966634U (en) * | 2017-07-25 | 2018-02-06 | 河钢股份有限公司邯郸分公司 | A kind of improved ladle upper nozzle brick cup |
| CN108273987A (en) * | 2018-04-09 | 2018-07-13 | 东北大学 | A kind of ladle ventilating filling pipe end brick cup and its method for controlling ladle roughing slag |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109759575A (en) | 2019-05-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP4134186A1 (en) | Lf refining ladle microporous ceramic rod air-permeable upper nozzle well block, and argon blowing control method therefor | |
| CN109732074B (en) | Ladle dispersion ring ventilation upper nozzle pocket brick and argon blowing metallurgical method thereof | |
| CN109719290B (en) | Ladle circumferential seam type ventilation upper nozzle pocket brick and argon blowing metallurgical method thereof | |
| CN106513608B (en) | One kind being used for slab CC tundish bar shaped air brick covering ar blowing refining device and argon gas control method | |
| CN104028739B (en) | A kind of ladle ventilating filling pipe end brick cup and the method controlling mouth of a river slag thereof | |
| CN206296446U (en) | One kind is used for continuous casting production ar blowing refining device | |
| CN107225231B (en) | Continuous casting tundish annular air curtain retaining wall and installation method thereof | |
| CN103862028B (en) | A kind of purging upper nozzle for continuous casting tundish brick cup and installation method thereof | |
| CN106670445B (en) | One kind being used for continuous casting production ar blowing refining device and argon gas control method | |
| CN104028740A (en) | Upper pocket block for argon blowing of continuous casting tundish and mounting method and application of upper pocket block | |
| CN209736625U (en) | ladle circumferential weld type breathable upper nozzle pocket brick and argon blowing metallurgical device | |
| CN111822690B (en) | Ladle argon blowing upper nozzle pocket brick and preparation method thereof | |
| CN109759575B (en) | Annular gas curtain wall for steel ladle and argon blowing metallurgical method thereof | |
| CN209830257U (en) | Argon blowing metallurgical device utilizing steel ladle dispersion ring breathable upper nozzle pocket brick | |
| CN204052886U (en) | A kind of continuous casting production Argon filling pipe end brick cup | |
| CN209632115U (en) | A kind of annular air curtain barricade wall and Argon metallurgical plant for ladle | |
| CN202291395U (en) | Air-blowing tapping pocket block | |
| CN114433829B (en) | Argon blowing refining method in pouring process of composite air brick and continuous casting ladle | |
| CN204035547U (en) | A kind of purging upper nozzle for continuous casting tundish brick cup | |
| CN202239612U (en) | Brick cup at molten steel outlet | |
| CN203992367U (en) | The ladle ventilating filling pipe end brick cup that a kind of yield rate is high | |
| CN203917903U (en) | When a kind of upper, prevent the protective device of molten steel secondary oxidation | |
| CN207272180U (en) | A kind of continuous casting production annular air curtain barricade wall | |
| CN212857748U (en) | Continuous casting tundish argon blowing upper nozzle pocket brick | |
| CN203197235U (en) | Continuous-casting porous adjustable argon blowing stopper rod |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |