CN111822690B - Ladle argon blowing upper nozzle pocket brick and preparation method thereof - Google Patents
Ladle argon blowing upper nozzle pocket brick and preparation method thereof Download PDFInfo
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- CN111822690B CN111822690B CN202010726679.8A CN202010726679A CN111822690B CN 111822690 B CN111822690 B CN 111822690B CN 202010726679 A CN202010726679 A CN 202010726679A CN 111822690 B CN111822690 B CN 111822690B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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Abstract
The invention relates to a ladle argon blowing upper nozzle pocket brick and a preparation method thereof, and the ladle argon blowing upper nozzle pocket brick comprises a ladle argon blowing upper nozzle pocket brick body, a diffused ventilating ring, an air chamber, an air inlet pipe, an air chamber cover plate and an iron ring, wherein the middle part of the ladle argon blowing upper nozzle pocket brick body is provided with a runner hole and an upper nozzle mounting hole which penetrate through the upper part and the lower part, the diffused ventilating ring, the air chamber and the air chamber cover plate are arranged in the ladle argon blowing upper nozzle pocket brick body from top to bottom, the upper end of the diffused ventilating ring extends out of the upper surface of the ladle argon blowing upper nozzle pocket brick body, the air chamber is formed at the bottom of the diffused ventilating ring, the lower opening of the air chamber is provided with the air chamber cover plate, one end of the air inlet pipe is welded on the air chamber cover plate and communicated with the air chamber, and the other end of the air inlet pipe extends out of the side part of the ladle argon blowing upper nozzle pocket brick body. The invention adopts a method of upside down placing to assemble the casting construction moulding bed and the casting construction for preparing the ladle argon blowing upper nozzle brick, which solves the technical problem that the dispersive air permeable ring is not easy to fix.
Description
Technical Field
The invention relates to a ladle argon blowing upper nozzle pocket brick and a preparation method thereof, belonging to the technical field of steel-making process in ferrous metallurgy.
Background
The LF refining ladle bottom argon blowing is a simple and efficient external refining technology and generally comprises two stages of large-flow argon blowing, stirring and mixing in the early stage and small-flow soft blowing for removing impurities in the later stage. At present, more than 100 tons of LF refining ladles in China are generally selected from two bottom-blown air bricks, the processing time of high-quality steel is generally more than 40min, wherein the soft blowing is carried out for 8-12min, and the following problems or defects exist in the production practice: (1) the soft blowing time is insufficient, so that the impurity removal effect is influenced; (2) the overlong LF refining time causes mismatching of the furnace and the machine, and becomes a limiting link for increasing yield and efficiency. Therefore, a soft blowing place at the later stage of LF refining in the prior art is transferred to the continuous casting ladle revolving platform from the LF refining treatment position, and during the waiting standing of the continuous casting ladle revolving platform and the pouring process of the pouring position, argon is blown through the tundish nozzle pocket block with the argon blowing function, so that impurities can be further removed, and the soft blowing time of the LF refining treatment position can be saved.
The ladle nozzle pocket brick with the argon blowing function forms 1 annular air curtain above a ladle upper nozzle, so that the aims of removing non-metal impurities in molten steel, inhibiting nozzle slag, improving casting blank quality, preventing nozzle nodulation and blockage and ensuring smooth continuous casting production are fulfilled. A ladle nozzle pocket brick with argon blowing function is characterized in that a plurality of air permeable elements are embedded in a common ladle nozzle pocket brick, the air permeable elements are ceramic rods which are sintered at high temperature and have directional through apertures, a plurality of tiny through holes are uniformly distributed in the air permeable elements, the lower parts of the air permeable elements are communicated through 1 annular channel to keep the air permeable elements smooth, and the annular channels are connected with an air inlet pipe. The air inlet pipe is connected with an air source and provides air required during working. Inert gas is introduced into the ladle gas-permeable nozzle pocket brick, the gas is blown into a ladle through the straight-through micro aperture in the ceramic rod, 1 annular gas curtain barrier is formed above the upper nozzle of the ladle, a large amount of micro bubbles in the annular gas curtain barrier can collide with and capture nonmetallic inclusion particles in molten steel, and then the nonmetallic inclusion particles are driven to float upwards to be removed, so that the cleanliness of the molten steel is improved. However, in the prior art, the gas chamber of the dispersed permeable nozzle pocket brick for the ladle is easy to enter castable foreign matters, so that the gas permeability is influenced, the gas inlet pipe is not firmly fixed, and the gas leakage problem is caused, and the problems that the part of the lower part of the ladle upper nozzle pocket brick body, which is provided with the upper nozzle, is easy to have larger cracks, the service life is influenced and the like are solved.
Chinese patent document CN201455253U (patent number: 200920016943.8) discloses a novel molten steel tank nozzle seat brick used in the steelmaking production process, which is of a cylindrical structure and consists of an upper circular truncated cone body, a middle cylinder and a lower circular truncated cone body, wherein the diameter D1 of the inlet of the upper circular truncated cone body is 150-240 mm, and the diameter D2 of the lower connected cylinder channel is 80-100 mm. The height L1 of the upper circular truncated cone is 80-200 mm. However, the nozzle block in the patent has no gas permeable element, has no functions of removing impurities and purifying molten steel, and has the problems that the mounting position of the upper nozzle of the ladle upper nozzle block body is easy to have larger cracks, and the service life is influenced.
Chinese patent document CN109732074A (patent application No. 201910126691.2) discloses a steel ladle dispersed gas permeable ring gas permeable upper nozzle brick cup and an argon blowing metallurgical method thereof, which comprises an upper nozzle brick cup body, a dispersed gas permeable ring, a gas chamber box and a gas inlet pipe, wherein the middle part of the steel ladle upper nozzle brick cup body is provided with a vertically-penetrating runner hole, a connecting hole and an upper nozzle mounting hole, argon is blown in the whole process of continuous casting steel ladle pouring, most of argon bubbles move upwards, an annular gas curtain barrier is formed around the steel ladle upper nozzle, the molten steel entering the steel upper nozzle is subjected to gas washing, stable and continuous annular gas flow is formed in the upper nozzle, the upper nozzle nodulation is inhibited, and the steel ladle slag generated by confluence vortex and drainage sink pit is effectively inhibited in the later period of steel ladle pouring. However, in the nozzle pocket brick in the patent, the gas permeable ring is positioned in a die for preparing the ladle gas permeable upper nozzle pocket brick body, and in the pouring process of the pouring material, foreign matters in the pouring material easily enter a gas chamber to influence the gas permeability and the gas inlet pipe is not firmly fixed to cause the gas leakage problem, and the problems that the part of the lower part of the ladle upper nozzle pocket brick body, which is provided with the upper nozzle, is easy to generate larger cracks, and the service life is influenced are solved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a ladle argon blowing upper nozzle pocket brick and a preparation method thereof, and the invention solves the problems and the defects of the ladle dispersive breathable ring breathable upper nozzle pocket brick in the prior patent technology CN109732074A (patent application number: 201910126691.2) by arranging an air chamber cover plate at the lower opening of an air chamber of the ladle argon blowing upper nozzle pocket brick, welding an air inlet pipe on the air chamber cover plate and embedding an iron ring at the lower part of a ladle argon blowing upper nozzle pocket brick body.
The utility model provides a ladle argon blowing upper nozzle pocket brick, includes the body, the middle part of body is provided with the stream steel hole and the upper nozzle mounting hole that run through from top to bottom, and this internal top-down is provided with diffuse ventilative ring, air chamber and air chamber apron, and the up end of body is stretched out to the upper end of diffuse ventilative ring, and the air chamber is located the bottom of diffuse ventilative ring, and the end opening of air chamber sets up the air chamber apron, and the part outer wall of the one end of intake pipe welds on the air chamber apron, with the air chamber intercommunication, and the other end stretches out from the lateral part of body.
The ladle argon blowing upper nozzle pocket brick is used for blowing argon in the pouring process of a continuous casting ladle, and the argon blowing flow is controlled by adopting a PLC (programmable logic controller) so as to keep the liquid level of argon blowing steel slightly fluctuated and not break the liquid level of the steel as a control principle.
Preferably, the diffused ventilating ring is annular, the longitudinal section of the diffused ventilating ring is isosceles trapezoid, the width x of the upper part of the ring is 30-45 mm, the width y of the lower part of the ring is 40-55 mm, and the height h of the ring is 100-160 mm.
Preferably, the whole air chamber is annular, the longitudinal section of the air chamber is semicircular, the radius R of the longitudinal section of the air chamber is 8-12 mm, an air inlet pipe mounting hole is formed in the air chamber, the diameter d of the air inlet pipe mounting hole is matched with the outer diameter of an air inlet pipe, and the air inlet pipe mounting hole is used for mounting the air inlet pipe.
Preferably, the air chamber cover plate is annular as a whole, the longitudinal section of the air chamber cover plate is rectangular, the annular width e of the air chamber cover plate is larger than the diameter 2R of the air chamber but smaller than the lower width y of the air permeable ring, so that the air chamber cover plate completely covers the lower opening of the air chamber, and the lower end surface of the air permeable ring and the pouring material of the body can have a certain bonding interface.
Preferably, the outer wall of one end of the air inlet pipe is welded on the air chamber cover plate, and the end part of the air inlet pipe is aligned with the longitudinal center line of the air chamber cover plate, so that the communication area of the air inlet pipe and the air chamber is the largest, and the communication effect is optimal.
Preferably, an iron ring is further embedded in the lower part of the body; the whole iron ring is annular, the height L is 40-50 mm, the distance a between the lower end of the iron ring and the lower end of the body is 50-60 mm, and the depth z of the iron ring embedded in the surface layer of the argon blowing upper nozzle pocket brick body of the steel ladle is 10-20 mm.
Preferably, the height m of the upper end of the diffused ventilating ring extending out of the upper surface of the ladle argon blowing upper nozzle pocket brick body is 10-12 mm.
Preferably, the air chamber cover plate and the iron ring are both made of iron sheets with the thickness of 1-2 mm.
The upper width x of the dispersive air-permeable ring circular ring is 30-45 mm, the lower width y of the dispersive air-permeable ring circular ring is 40-55 mm, the height h of the dispersive air-permeable ring circular ring is 100-160 mm, the lower opening of the air chamber is provided with an air chamber cover plate, the circular width e of the air chamber cover plate is larger than the diameter 2R of the air chamber and smaller than the lower width y of the air-permeable ring, so that the air chamber cover plate completely covers the lower opening of the air chamber, and the lower part of the body is also embedded with iron rings and other designs, so that the dispersive air-permeable ring circular ring is based on the task of the invention and is obtained through a large number of development tests and application verification: 1) the results of research and test show that the width of the machine-pressing forming diffused ventilating ring is required to be more than or equal to 30mm, otherwise the machine-pressing forming is difficult, the quality is difficult to ensure, the forming qualification rate is low, the popularization and the application are difficult, and the width of the diffused ventilating ring is less than or equal to 50mm according to the space size requirement of the set diffused ventilating ring, otherwise, the size of the tundish upper nozzle brick is large, the installation space is not available, the weight is large, and the cost is high, so the reasonable width of the diffused ventilating ring is 30-50 mm, the longitudinal section of the ventilating ring is in an isosceles trapezoid shape, the upper width x of the circular ring is 30-45 mm, the lower width y of the circular ring is 40-50 mm, and the design is convenient for demolding and meets the quality requirement; 2) the height h of the diffused air ring is 100-160 mm, and is set based on the measurement of the erosion residual thickness of the ladle upper nozzle pocket brick body and the micropore ceramic rod during the ladle off-line minor repair, so as to ensure the synchronization of the service life of the micropore ceramic rod with the ladle nozzle pocket brick body and the ladle slag line working lining; 3) the end opening of air chamber sets up the air chamber apron, and the one end of intake pipe welds on the air chamber apron, and the ring width e of air chamber apron is greater than the diameter 2R of air chamber, but is less than designs such as the lower part width y of ventilative ring, has solved current patent technology CN109732074A (patent application number: 201910126691.2) the air chamber of the prepared steel ladle dispersive air-permeable ring air-permeable upper nozzle pocket brick is easy to enter the castable foreign matter, thereby affecting the air permeability and the air inlet pipe is not fixed firmly, and further causing the problem of air leakage; 4) through a large number of researches and development tests, the main reason and the solution method that the part of the lower part of the ladle argon-blowing upper nozzle pocket brick body, which is provided with the upper nozzle, has larger cracks are found: the steel ladle argon blowing upper nozzle brick cup solves the problem that a part of a steel ladle dispersion type breathable upper nozzle brick cup body, which is provided with an upper nozzle, is easy to have larger cracks in the lower part of the steel ladle dispersion type breathable upper nozzle brick cup body in the prior art CN109732074A (patent application number: 201910126691.2), and prolongs the service life.
The invention also provides a pouring construction moulding bed for preparing the ladle argon blowing upper nozzle pocket brick, which comprises a pouring construction external mould and a pouring construction internal mould, wherein the pouring construction external mould is formed by combining a pouring construction external mould bottom plate, an external mould wall plate and an external mould top plate through fixing bolts from bottom to top.
Preferably, the external mold bottom plate, the external mold wall plate and the external mold top plate for pouring construction are made of steel plates with the thickness of 20-30 mm.
The casting construction internal mold is preferably a disposable foam internal mold, is prepared from polystyrene foam in the prior art, is suitable for various inner cavity shapes and specifications, is disposable, does not need to be demoulded, is simple and convenient, saves time and labor, does not deform or absorb water in the using process, and has good pressure resistance, elasticity and rigidity.
The invention also provides a preparation method of the ladle argon blowing upper nozzle pocket brick, which is characterized in that the pouring construction moulding bed assembly and the pouring construction of the ladle argon blowing upper nozzle pocket brick adopt an upper and lower inversion method, and the method comprises the following steps:
1) preparation of a dispersive, gas permeable ring: using tabular corundum and zirconium mullite as main raw materials, and adding alpha-A1 into the matrix fine powder2O3、Cr2O3Additive is produced by the existing production process of the dispersive air brick, an air chamber is formed at the bottom of the dispersive air ring in one step by embedding a forming die, and AL is contained in a finished product2O3The content is more than or equal to 83 percent, and Cr2O3The content is more than or equal to 2 percent, the high-temperature compressive strength (1600 ℃ multiplied by 3 h) is more than or equal to 50Mpa, and the volume density (1600 ℃ multiplied by 3 h) is more than or equal to 2.65g/cm3；
2) And (3) pouring construction moulding bed assembly for preparing the ladle argon blowing upper nozzle brick: positioning a casting construction internal mold on a casting construction external mold bottom plate, ensuring that the longitudinal central lines of the casting construction internal mold and the casting construction external mold bottom plate are superposed, inverting a dispersive ventilating ring, positioning the dispersive ventilating ring in a ventilating ring positioning groove of the casting construction external mold bottom plate, arranging an air chamber at the upper top, coating corundum fire clay with the thickness of 1.5-2 mm on the upper end of the air chamber, sealing an air chamber cover plate welded with an air inlet pipe on the air chamber, sealing the air chamber cover plate on the air chamber, assembling an external mold wall plate and the external mold bottom plate, adjusting the air inlet pipe to be positioned in an air inlet pipe positioning hole on the external mold wall plate, connecting and fixing the external mold wall plate and the external mold bottom plate by using a fixing bolt, and connecting and fixing the external mold top plate and the external mold wall plate by using the fixing bolt;
3) preparing a ladle argon blowing upper nozzle pocket brick body, placing an assembled casting construction moulding bed on a vibrating table, locking, starting up, adding corundum casting material while vibrating, placing an iron ring on a casting surface when the distance between the iron ring and a casting horizontal plane is L + a away from the upper end, wherein the distance Z between the outer wall of the iron ring and an outer mould wall plate is 10-20 mm, removing the mould after the casting is finished, standing the iron ring on the vibrating table for 24-36 hours, drying the iron ring for 24-36 hours at 15-25 ℃, then continuously heating the iron ring to 275-300 ℃ in a drying kiln at the speed of 10 ℃/h, and drying the iron ring for 24-36 hours, thus completing the preparation of the ladle argon blowing upper nozzle pocket brick.
The bolt is M12 or M16.
The corundum castable is prepared by adding alpha-A1 into matrix fine powder of main raw materials such as tabular corundum and spinel2O3、Cr2O3Additives, etc., to ensure AL in the finished product2O3The content is more than or equal to 92 percent, and Cr2O3The content is more than or equal to 2 percent, and the volume density is more than or equal to 3.0g/cm3The high-temperature rupture strength is more than or equal to 12Mpa, and the high-temperature compressive strength is more than or equal to 80 Mpa.
The pouring construction moulding bed assembly and the pouring construction for preparing the ladle argon blowing upper nozzle brick adopt an upper and lower inversion method, and the technical problem that a dispersion type air permeable ring is not easy to fix is solved.
The invention has the beneficial effects that:
1) the upper width x of the dispersive air-permeable ring circular ring is 30-45 mm, the lower width y of the dispersive air-permeable ring circular ring is 40-55 mm, the height h of the dispersive air-permeable ring circular ring is 100-160 mm, the lower opening of the air chamber is provided with an air chamber cover plate, the circular width e of the air chamber cover plate is larger than the diameter 2R of the air chamber and smaller than the lower width y of the air-permeable ring, so that the air chamber cover plate completely covers the lower opening of the air chamber, and the like, and the design of the invention essentially solves the problems of the prior art CN109732074A (patent application number: 201910126691.2) the air chamber of the air-permeable upper nozzle pocket brick of the dispersion type air-permeable ring of the ladle is easy to enter the castable foreign matter, thereby influencing the air permeability and the air inlet pipe is not fixed firmly, thereby causing the problem of air leakage, and the average production cost of the dispersion type air-permeable ring is reduced by 178 yuan on the same scale.
2) The production application proves that the depth z of the iron ring embedded in the surface layer of the argon blowing upper nozzle pocket brick body of the steel ladle is 10-20 mm, and the problem of the prior patent technology CN109732074A (patent application number: 201910126691.2) the ladle diffuse type permeable ring permeable upper nozzle pocket brick body has the problem that the upper nozzle mounting part is easy to have larger cracks, and the service life is prolonged, so that the average service life of the ladle argon blowing upper nozzle pocket brick prepared by the invention is improved to 49 heats, compared with the prior art CN109732074A (patent application number: 201910126691.2) the average service life of the ladle dispersive air-permeable ring air-permeable upper nozzle pocket brick is improved by 4 heats on a same scale.
3) The preparation method of the ladle argon blowing upper nozzle pocket brick adopts the upper and lower inversion method for the pouring construction moulding bed assembly and the pouring construction of the ladle argon blowing upper nozzle brick, solves the technical problem that a dispersed ventilating ring is not easy to fix, adopts a disposable foam inner mould for the pouring construction inner mould, does not need demoulding, simplifies the preparation process flow, realizes synchronous mass production, solves the problem that the mass production is limited by the number of steel moulds, and shortens the preparation period at the same time compared with the prior patent technology CN109732074A (patent application number: 201910126691.2) the preparation period of the ladle diffuse type gas permeable ring gas permeable upper nozzle pocket brick is shortened by 8-24 hours.
Drawings
FIG. 1 is a front view of a ladle argon blowing upper nozzle brick cup structure in an embodiment of the invention.
FIG. 2 is a top view of the structure of an upper nozzle brick for argon blowing of a ladle in the embodiment of the invention.
FIG. 3 is a schematic view of a structure of a diffusive air ring in an embodiment of the present invention.
FIG. 4 is a schematic view illustrating the welding of a cover plate and an inlet pipe of an embodiment of the present invention.
FIG. 5 is an assembly schematic diagram of an outer mold and an inner mold for pouring construction of a ladle argon blowing upper nozzle pocket brick in the embodiment of the invention.
FIG. 6 is a top view of an outer mold for pouring a ladle argon-blowing upper nozzle pocket brick in the embodiment of the invention.
In the figure, 1, a ladle argon blowing upper nozzle pocket brick body; 2. a diffusive gas permeable ring; 3. an air chamber; 4. an air inlet pipe; 5. an air chamber cover plate; 6. a steel flowing hole; 7. a water feeding port mounting hole; 8. an iron ring; 9. an air inlet pipe mounting hole; 10. pouring a construction external mold bottom plate; 11. an outer mold wall plate; 12. an outer mold top plate; 13 a positioning groove of a breathable ring; 14. fixing the bolt; 15. pouring a construction internal mold; 16. air inlet pipe locating hole.
Detailed Description
The invention is further illustrated by the following examples and drawings, but is not limited thereto.
Example 1
A ladle argon blowing upper nozzle pocket brick is disclosed, as shown in figure 1-figure 6, and comprises a ladle argon blowing upper nozzle pocket brick body 1, a dispersive air permeable ring 2, an air chamber 3, an air inlet pipe 4, an air chamber cover plate 5 and an iron ring 8, wherein the middle part of the ladle argon blowing upper nozzle pocket brick body 1 is provided with a runner hole 6 and an upper nozzle mounting hole 7 which are vertically penetrated, the dispersive air permeable ring 2, the air chamber 3 and the air chamber cover plate 5 are arranged in the ladle argon blowing upper nozzle pocket brick body 1 from top to bottom, the upper end of the dispersive air permeable ring extends out of the upper surface of the ladle argon blowing upper nozzle pocket brick, the air chamber 3 is formed at the bottom of the dispersive air permeable ring, the lower opening of the air chamber 3 is provided with the air chamber cover plate 5, one end of the air inlet pipe 4 is welded on the air chamber cover plate 5 and is communicated with the air chamber 3, the other end of the air inlet pipe extends out of the side part of the ladle argon blowing upper nozzle pocket brick body, the iron ring 8 is embedded at the lower part of the ladle argon blowing upper nozzle pocket brick body, the ladle argon blowing upper nozzle pocket brick is used for blowing argon in the pouring process of a continuous casting ladle, and the argon blowing flow is controlled by adopting a PLC (programmable logic controller) so as to keep the liquid level of argon blowing steel slightly fluctuated and not break the liquid level of the steel as a control principle.
The dispersive type ventilation ring 2 is of a circular ring shape as a whole, the longitudinal section of the dispersive type ventilation ring is of an isosceles trapezoid shape, the width x of the upper part of the circular ring is 45mm, the width y of the lower part of the circular ring is 50mm, and the height h of the circular ring is 120 mm.
The whole air chamber 3 is circular, the longitudinal section of the air chamber is semicircular, the radius R of the air chamber is 12mm, an air inlet pipe mounting hole 9 is formed in the air chamber 3, the diameter d of the air inlet pipe mounting hole is matched with the outer diameter of an air inlet pipe, and the air inlet pipe mounting hole is used for mounting an air inlet pipe 4.
The whole gas chamber cover plate 5 is circular, the longitudinal section of the gas chamber cover plate is rectangular, the circular width e of the gas chamber cover plate 5 is larger than the diameter 2R (24 mm) of the gas chamber 3, but smaller than the lower width y (50 mm) of the gas permeable ring 3, and e is 36mm, so that the gas chamber cover plate 5 completely covers the lower opening of the gas chamber 3, and the lower end face of the gas permeable ring 2 and the body casting material can have a certain bonding interface.
One end of the air inlet pipe 4 is welded on the air chamber cover plate 5, and the end part of the air inlet pipe is aligned with the longitudinal central line of the air chamber cover plate, so that the communication area of the air inlet pipe 4 and the air chamber is the largest, and the communication effect is optimal.
The whole iron ring 8 is in a ring shape, the height L is 40mm, the distance a between the lower end of the iron ring and the lower end of the ladle argon blowing upper nozzle brick cup body 1 is 50mm, and the depth z of the iron ring 8 embedded in the surface layer of the steel ladle argon blowing upper nozzle brick cup body is 10 mm.
The height m of the upper end of the dispersive air-permeable ring 2 extending out of the upper surface of the steel ladle argon blowing upper nozzle pocket brick body 1 is 10 mm. The air chamber cover plate 5 and the iron ring 8 are made of 1mm iron sheets.
The pouring construction forming die for preparing the ladle argon blowing upper nozzle pocket brick comprises a pouring construction outer die and a pouring construction inner die 15, wherein the pouring construction forming die is formed by combining a pouring construction outer die bottom plate 10, an outer die wall plate 11 and an outer die top plate 12 from bottom to top through fixing bolts 14.
The external mold bottom plate 10, the external mold wall plate 11 and the external mold top plate 12 for pouring construction are made of steel plates with the thickness of 20 mm.
The casting construction internal mold 15 is designed as a disposable foam internal mold, is prepared by polystyrene foam in the prior art, is suitable for various inner cavity shapes and specifications, is disposable, does not need to be demoulded, is simple and convenient, saves time and labor, does not deform or absorb water in the using process, and has good pressure resistance, elasticity and rigidity.
The preparation method of the ladle argon blowing upper nozzle pocket brick adopts an upper and lower inversion method for the pouring construction moulding bed assembly and the pouring construction for preparing the ladle argon blowing upper nozzle pocket brick, solves the technical problem that the dispersive type air permeable ring 2 is not well fixed, and comprises the following steps:
1) preparing dispersive gas permeable ring 2, using tabular corundum and zirconium mullite as main raw materials, adding alpha-A1 into the substrate fine powder2O3、Cr2O3The additive is added, the existing production process of the dispersive air brick is adopted for production, the air chamber 3 is formed at the bottom of the dispersive air ring in one step by embedding a forming die, and Al in the finished product2O3The content is more than or equal to 83 percent, and Cr2O3The content is more than or equal to 2 percent, the high-temperature compressive strength (1600 ℃ multiplied by 3 h) is more than or equal to 50Mpa, and the volume density (1600 ℃ multiplied by 3 h) is more than or equal to 2.65g/cm3；
2) And (3) pouring construction moulding bed assembly for preparing the ladle argon blowing upper nozzle brick: positioning a casting construction internal mold 15 on a casting construction external mold bottom plate 10 to ensure that the longitudinal central lines of the casting construction internal mold and the external mold bottom plate coincide, inverting a dispersive air permeable ring 2, positioning the dispersive air permeable ring 2 in an air permeable ring positioning groove 13 of the casting construction external mold bottom plate 10, namely, arranging an air chamber 3 at the upper top, coating corundum fire clay with the thickness of 1.5mm on the upper end of the air chamber, sealing an air chamber cover plate 5 welded with an air inlet pipe 4 on the air chamber 3, ensuring that the air chamber cover plate 5 seals the longitudinal central lines of the air chamber 3 to coincide, assembling the external mold wall plate 11 with the external mold bottom plate 10, adjusting the air inlet pipe 4 to be positioned in an air inlet pipe positioning hole 16 on the external mold wall plate 11, connecting and fixing the external mold wall plate 11 with the external mold bottom plate 10 by using a fixing bolt 14, and connecting and fixing the external mold top plate 12 with the external mold wall plate 11 by the bolt 14;
3) preparing a ladle argon blowing upper nozzle pocket brick body 1, placing an assembled casting construction moulding bed on a vibrating table, locking, starting up, adding corundum castable while vibrating, placing an iron ring 8 on a casting surface when the distance between the outer wall of the iron ring 8 and an outer mold wall plate 11 is 10mm when the casting horizontal plane is away from the upper end by L + a =90mm, after the casting is finished, placing the vibrating table for standing for 24 hours (summer), removing the mould, drying for 24 hours at 15-25 ℃, then continuously heating to 275 ℃ in a drying kiln at the speed of 10 ℃/h, and drying for 36 hours, thus finishing the preparation of the ladle argon blowing upper nozzle pocket brick.
The bolt 14 is M12.
The corundum castable is prepared by adding alpha-A1 into matrix fine powder of main raw materials such as tabular corundum and spinel2O3、Cr2O3Additives, etc. to ensure Al in the finished product2O3The content is more than or equal to 92 percent, and Cr2O3The content is more than or equal to 2 percent, and the volume density is more than or equal to 3.0g/cm3The high-temperature rupture strength is more than or equal to 12Mpa, and the high-temperature compressive strength is more than or equal to 80 Mpa.
Example 2
The ladle argon blowing upper nozzle pocket brick as described in the embodiment 1 is different in that:
the dispersive type ventilation ring 2 is of a circular ring shape as a whole, the longitudinal section of the dispersive type ventilation ring is of an isosceles trapezoid shape, the width x of the upper part of the circular ring is 40mm, the width y of the lower part of the circular ring is 45mm, and the height h of the circular ring is 160 mm.
The air chamber 3 is integrally annular, the longitudinal section of the air chamber is semicircular, and the radius R of the air chamber is 10 mm.
The whole gas chamber cover plate 5 is circular, the longitudinal section of the gas chamber cover plate is rectangular, the circular width e of the gas chamber cover plate 5 is larger than the diameter 2R (20 mm) of the gas chamber 3, but is smaller than the lower width y (45 mm) of the gas permeable ring 2, and e is 32 mm.
The whole iron ring 8 is in a ring shape, the height L is 50mm, the distance a between the lower end of the iron ring and the lower end of the ladle argon blowing upper nozzle pocket brick body 1 is 60mm, and the depth z of the iron ring 8 embedded in the surface layer of the steel ladle argon blowing upper nozzle pocket brick body is 20 mm.
The air chamber cover plate 5 and the iron ring 8 are both made of 2.0mm iron sheets.
The preparation method of the ladle argon blowing upper nozzle pocket brick adopts an upper and lower inversion method for the pouring construction moulding bed assembly and the pouring construction for preparing the ladle argon blowing upper nozzle pocket brick, solves the technical problem that the dispersive type air permeable ring 2 is not well fixed, and comprises the following steps:
1) preparing dispersive gas permeable ring 2 by adding alpha-A1 into substrate fine powder of main raw materials such as tabular corundum and zirconium mullite2O3、Cr2O3When additives are added, the existing production process of the dispersive air brick is adopted for production, the air chamber 3 is formed at the bottom of the dispersive air ring in one step by embedding a forming die, and AL is contained in the finished product2O3The content is more than or equal to 83 percent, and Cr2O3The content is more than or equal to 2 percent, the high-temperature compressive strength (1600 ℃ multiplied by 3 h) is more than or equal to 50Mpa, and the volume density (1600 ℃ multiplied by 3 h) is more than or equal to 2.65g/cm3；
2) And (3) pouring construction moulding bed assembly for preparing the ladle argon blowing upper nozzle brick: positioning a casting construction internal mold 15 on a casting construction external mold bottom plate 10 to ensure that the longitudinal central lines of the casting construction internal mold and the external mold bottom plate coincide, inverting a dispersive air permeable ring 2, positioning the dispersive air permeable ring 2 in an air permeable ring positioning groove 13 of the casting construction external mold bottom plate 10, namely, arranging an air chamber 3 at the upper top, coating corundum fire clay with the thickness of 2.0mm on the upper end of the air chamber, sealing an air chamber cover plate 5 welded with an air inlet pipe 4 on the air chamber 3, ensuring that the air chamber cover plate 5 seals the longitudinal central lines of the air chamber 3 to coincide, assembling the external mold wall plate 11 with the external mold bottom plate 10, adjusting the air inlet pipe 4 to be positioned in an air inlet pipe positioning hole 16 on the external mold wall plate 11, connecting and fixing the external mold wall plate 11 with the external mold bottom plate 10 by using a fixing bolt 14, and connecting and fixing the external mold top plate 12 with the external mold wall plate 11 by the bolt 14;
3) preparing a ladle argon blowing upper nozzle pocket brick body 1, placing an assembled casting construction moulding bed on a vibrating table, locking, starting up, adding corundum castable while vibrating, placing an iron ring 8 on a casting surface when the distance between the outer wall of the iron ring 8 and an outer mold wall plate 11 is 20mm when the casting horizontal plane is away from the upper end by L + a =110mm, removing the mould after the casting is finished and the vibrating table is kept still for 30 hours (spring and autumn), drying for 36 hours at 15-25 ℃, and then continuously heating to 300 ℃ in a drying kiln at the speed of 10 ℃/h for drying for 24 hours, thus finishing the preparation of the ladle argon blowing upper nozzle pocket brick.
The bolt 14 is M16.
Example 3
The ladle argon blowing upper nozzle pocket brick as described in the embodiment 1 is different in that:
the upper part width x of the dispersive gas-permeable ring 2 is 30mm, the lower part width y is 40mm, and the height h is 100 mm. The radius R of the longitudinal section of the air chamber 3 is 8 mm.
The air chamber cover plate 5 is annular as a whole, the longitudinal section of the air chamber cover plate is rectangular, the annular width e of the air chamber cover plate 5 is larger than the diameter 2R (16 mm) of the air chamber 3, but smaller than the lower width y (40 mm) of the air permeable ring 2, and e is 30 mm.
The whole iron ring 8 is circular, the height L is 45mm, the distance a between the lower end of the iron ring and the lower end of the ladle argon blowing upper nozzle brick cup body 1 is 55mm, and the depth z of the iron ring 8 embedded in the surface layer of the steel ladle argon blowing upper nozzle brick cup body is 15 mm.
The height m of the upper end of the dispersive air-permeable ring 2 extending out of the upper surface of the ladle argon blowing upper nozzle pocket brick body 1 is 12 mm.
The air chamber cover plate 5 and the iron ring 8 are made of 1.5mm iron sheets.
A method for preparing a ladle argon blowing upper nozzle pocket brick adopts an upper and lower inversion method for the pouring construction moulding bed assembly and pouring construction for preparing the ladle argon blowing upper nozzle brick, solves the technical problem that a dispersive type air permeable ring 2 is not well fixed, and comprises the following steps:
1) preparing dispersive gas permeable ring 2, using tabular corundum and zirconium mullite as main raw materials, adding alpha-A1 into the substrate fine powder2O3、Cr2O3When additives are added, the existing production process of the dispersive air brick is adopted for production, the air chamber 3 is formed at the bottom of the dispersive air ring in one step by embedding a forming die, and AL is contained in the finished product2O3The content is more than or equal to 83 percent, and Cr2O3The content is more than or equal to 2 percent, the high-temperature compressive strength (1600 ℃ multiplied by 3 h) is more than or equal to 50Mpa, and the volume density (1600 ℃ multiplied by 3 h) is more than or equal to 2.65g/cm3；
2) And (3) pouring construction moulding bed assembly for preparing the ladle argon blowing upper nozzle brick: positioning a casting construction internal mold 15 on a casting construction external mold bottom plate 10 to ensure that the longitudinal central lines of the casting construction internal mold and the external mold bottom plate coincide, inverting a dispersive air permeable ring 2, positioning the dispersive air permeable ring 2 in an air permeable ring positioning groove 13 of the casting construction external mold bottom plate 10, namely, arranging an air chamber 3 at the upper top, coating corundum fire clay with the thickness of 2.0mm on the upper end of the air chamber, sealing an air chamber cover plate 5 welded with an air inlet pipe 4 on the air chamber 3, ensuring that the air chamber cover plate 5 seals the longitudinal central lines of the air chamber 3 to coincide, assembling the external mold wall plate 11 with the external mold bottom plate 10, adjusting the air inlet pipe 4 to be positioned in an air inlet pipe positioning hole 16 on the external mold wall plate 11, connecting and fixing the external mold wall plate 11 with the external mold bottom plate 10 by using a fixing bolt 14, and connecting and fixing the external mold top plate 12 with the external mold wall plate 11 by the bolt 14;
3) preparing a ladle argon blowing upper nozzle pocket brick body 1, placing an assembled casting construction moulding bed on a vibrating table, locking, starting up, adding corundum castable while vibrating, placing an iron ring 8 on a casting surface when the distance between the outer wall of the iron ring 8 and an outer mold wall plate 11 is 15mm when the casting horizontal plane is away from the upper end by L + a =100mm, after the casting is finished, standing the lower vibrating table for 36 hours (in winter), removing the mould, drying for 24 hours at 15-25 ℃, then continuously heating to 300 ℃ in a drying kiln at the speed of 10 ℃/h, and drying for 30 hours, thus finishing the preparation of the ladle argon blowing upper nozzle pocket brick.
Comparative example 1
The ladle dispersed permeable ring air-permeable nozzle block disclosed in example 1 of chinese patent document CN109732074A (patent application No. 201910126691.2).
Comparative example 2
The ladle dispersed permeable ring air-permeable nozzle block disclosed in example 2 of chinese patent document CN109732074A (patent application No. 201910126691.2).
Comparative example 3
The ladle dispersed permeable ring air-permeable nozzle block disclosed in example 3 of chinese patent document CN109732074A (patent application No. 201910126691.2).
Examples of the experiments
Comparing the production cost of the dispersive gas-permeable ring, the production period for preparing the ladle gas-permeable nozzle brick base body and the application condition of producing the ultra-low carbon aluminum killed steel DC04 in a slab caster of a certain steel plant according to the embodiments 1 to 3 and the comparative examples 1 to 3, respectively taking a large-sample electrolytic sample at a casting blank 1/4, processing the large-sample electrolytic sample into a round bar with the diameter of 60mm and the height of 100mm, and detecting and comparing large-sample electrolytic inclusions, wherein the comparison result is shown in the following table 1.
TABLE 1
Through the data comparison in the table 1, compared with the ladle diffusion ring breathable upper nozzle pocket block related to the application comparative example CN109732074A (patent application No. 201910126691.2), the average production cost of the single diffusion type breathable ring is reduced by 178 yuan, the production cycle of the ladle breathable nozzle pocket block body is shortened by 8-24 hours, the ladle diffusion ring breathable upper nozzle pocket block is used for producing ultra-low carbon aluminum killed steel DC04 by slab caster pouring, the average content of electrolytic inclusions in a continuous casting billet sample is reduced by more than 16%, the average service life of the ladle nozzle pocket block is prolonged by 4 heats by one year, and the problem that foreign matters in a pouring material are easy to enter an air chamber of the ladle diffusion type breathable ring breathable upper nozzle pocket block prepared by the prior art, so that the air permeability is influenced, an air inlet pipe is not fixed firmly, and air leakage is essentially solved.
Claims (6)
1. The ladle argon blowing upper nozzle pocket brick is characterized by comprising a body (1), wherein a steel flowing hole (6) and an upper nozzle mounting hole (7) which penetrate through the body (1) from top to bottom are formed in the middle of the body (1), a dispersion type ventilation ring (2), an air chamber (3) and an air chamber cover plate (5) are arranged in the body (1) from top to bottom, the upper end of the dispersion type ventilation ring (2) extends out of the upper end face of the body (1), the air chamber (3) is located at the bottom of the dispersion type ventilation ring (2), the lower opening of the air chamber (3) is provided with the air chamber cover plate (5), one end of an air inlet pipe (4) is welded on the air chamber cover plate (5) and is communicated with the air chamber (3), the end of the air inlet pipe is aligned with the longitudinal central line of the air chamber cover plate (5), and the other end of the air inlet pipe extends out of the side portion of the body (1); the integral gas chamber is annular (3), the longitudinal section of the gas chamber is semicircular, the radius R of the gas chamber is 8-12 mm, the integral gas chamber cover plate (5) is annular, the longitudinal section of the gas chamber cover plate is rectangular, the annular width e of the gas chamber cover plate (5) is larger than the diameter 2R of the gas chamber (3) and smaller than the lower width y of the dispersive gas permeable ring (2), the gas chamber cover plate (5) completely covers the lower opening of the gas chamber (3), and the lower end face of the dispersive gas permeable ring (2) and a body pouring material have a certain bonding interface.
2. The ladle argon blowing upper nozzle pocket block according to claim 1, wherein the dispersive gas permeable ring (2) is annular as a whole, the longitudinal section of the dispersive gas permeable ring is isosceles trapezoid, the upper part of the annular ring has a width x of 30-45 mm, the lower part of the annular ring has a width y of 40-55 mm, and the height h of the annular ring is 100-160 mm.
3. The ladle argon blowing upper nozzle pocket block according to claim 1, wherein the air chamber (3) is provided with an air inlet pipe mounting hole (9), the diameter d of the air inlet pipe mounting hole is adapted to the outer diameter of an air inlet pipe, and the air inlet pipe mounting hole is used for mounting the air inlet pipe (4).
4. The ladle argon blowing upper nozzle pocket block according to claim 1, characterized in that an iron ring (8) is embedded at the lower part of the body (1); the iron ring (8) is annular, the height L is 40-50 mm, the distance a between the lower end of the iron ring (8) and the lower end of the body (1) is 50-60 mm, and the depth z of the iron ring (8) embedded in the surface layer of the body (1) is 10-20 mm.
5. The ladle argon blowing upper nozzle pocket block according to claim 1, wherein the height m of the upper end of the dispersive gas permeable ring (2) extending out of the upper surface of the body (1) is 10-12 mm.
6. The method for preparing the ladle argon-blowing upper nozzle pocket brick as claimed in any one of claims 1 to 5, wherein the method for assembling and pouring the casting construction moulding bed of the ladle argon-blowing upper nozzle pocket brick adopts an upside-down method, and comprises the following steps:
1) preparation of a dispersive, gas permeable ring: using tabular corundum and zirconium mullite as main raw materials, and adding alpha-A1 into the matrix fine powder2O3、Cr2O3The additive is produced by adopting the production process of the existing dispersive air brick, the air chamber (3) is formed at the bottom of the dispersive air ring in one step by embedding a forming die, and Al in a finished product2O3The content is more than or equal to 83 percent, and Cr2O3The content is more than or equal to 2 percent, the compression strength at high temperature of 1600 ℃ is more than or equal to 50Mpa, and the volume density is more than or equal to 2.65g/cm3；
2) And (3) pouring construction moulding bed assembly for preparing the ladle argon blowing upper nozzle brick: firstly, positioning a casting construction internal mold (15) on a casting construction external mold bottom plate (10) to ensure that the longitudinal central lines of the casting construction internal mold and the casting construction external mold bottom plate coincide, inverting a dispersive type air permeable ring (2), positioning the dispersive type air permeable ring in an air permeable ring positioning groove (13) of the casting construction external mold bottom plate (10), arranging an air chamber (3) at the upper top, coating corundum fire clay with the thickness of 1.5-2 mm on the upper end of the air chamber, sealing an air chamber cover plate (5) welded with an air inlet pipe (4) to cover an air chamber (3), sealing the air chamber cover plate (5) to cover the air chamber (3), assembling an outer mold wall plate (11) and an outer mold bottom plate (10), adjusting the air inlet pipe (4) to be positioned in an air inlet pipe positioning hole (16) on the outer mold wall plate (11), connecting and fixing the outer mold wall plate (11) and the outer mold bottom plate (10) by adopting a fixing bolt (14), and connecting and fixing an outer mold top plate (12) and the outer mold wall plate (11) by adopting the fixing bolt (14);
3) preparing a ladle argon blowing upper nozzle pocket brick body, placing an assembled casting construction moulding bed on a vibrating table, locking, starting up, adding corundum casting material while vibrating, placing an iron ring (8) on a casting surface when the distance between the iron ring (8) and a casting horizontal plane is L + a away from the upper end, wherein the distance z between the outer wall of the iron ring (8) and an outer mold wall plate (11) is 10-20 mm, removing the mould after the casting is finished, standing the lower vibrating table for 24-36 hours, drying the mould at 15-25 ℃ for 24-36 hours, continuously heating the mould to 275-300 ℃ in a drying kiln at the speed of 10 ℃/h, and drying the mould for 24-36 hours, thus completing the preparation of the ladle argon blowing upper nozzle pocket brick; l is the height of the iron ring (8), and a is the distance between the lower end of the iron ring (8) and the lower end of the body (1).
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| CN111185588B (en) * | 2020-02-26 | 2021-12-28 | 郑州大学 | Construction method of dry-type material tundish air curtain retaining wall |
| CN115026273B (en) * | 2022-06-16 | 2023-10-13 | 莱芜钢铁集团银山型钢有限公司 | Ladle argon blowing nozzle pocket brick and argon blowing metallurgical method thereof |
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| JP2004306050A (en) * | 2003-04-02 | 2004-11-04 | Shinagawa Refract Co Ltd | Upper nozzle for gas blowing of tundish |
| CN201385369Y (en) * | 2009-05-15 | 2010-01-20 | 辽宁丰华耐火材料有限公司 | Nozzle pocket brick mould |
| RU134092U1 (en) * | 2013-08-08 | 2013-11-10 | Компания с ограниченной ответственностью Пуянг Рефракториз (групп) Ко., ЛТД | BUCKET FOR BOTTOM METAL BLOWING WITH GAS IN THE DUCK |
| CN104028740B (en) * | 2014-06-18 | 2017-01-18 | 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 |
| CN106041045B (en) * | 2016-08-04 | 2018-08-17 | 山东钢铁股份有限公司 | A kind of continuous casting production disperse formula is breathed freely ring filling pipe end brick cup and its ar blowing refining method |
| CN109732074B (en) * | 2019-02-20 | 2023-08-25 | 山东钢铁股份有限公司 | Ladle dispersion ring ventilation upper nozzle pocket brick and argon blowing metallurgical method thereof |
| CN210172542U (en) * | 2019-03-29 | 2020-03-24 | 浙江宏丰炉料有限公司 | Anti-cracking and fireproof steel ladle material brick cup |
| CN110066906A (en) * | 2019-06-06 | 2019-07-30 | 洛阳利尔耐火材料有限公司 | A kind of one-pass molding integral air brick, molding die and forming method |
| CN211074048U (en) * | 2019-11-15 | 2020-07-24 | 济南昊天炉窑工程材料有限公司 | A mould for producing whole air brick |
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Inventor after: Wu Guangjun Inventor after: Wang Zhongxue Inventor after: Wang Jian Inventor after: Shi Lei Inventor after: Zhang Haibo Inventor after: Zhao Lifeng Inventor before: Wu Guangjun Inventor before: Wang Zhongxue Inventor before: Wang Jian Inventor before: Shi Lei Inventor before: Zhang Haibo Inventor before: Zhao Lifeng |