CN115026273A - Ladle argon blowing nozzle pocket brick and argon blowing metallurgical method thereof - Google Patents
Ladle argon blowing nozzle pocket brick and argon blowing metallurgical method thereof Download PDFInfo
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- CN115026273A CN115026273A CN202210689041.0A CN202210689041A CN115026273A CN 115026273 A CN115026273 A CN 115026273A CN 202210689041 A CN202210689041 A CN 202210689041A CN 115026273 A CN115026273 A CN 115026273A
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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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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention belongs to the technical field of steel metallurgy steelmaking, and particularly relates to a ladle argon blowing nozzle pocket brick and an argon blowing metallurgical method thereof, which comprise a ladle nozzle pocket brick body, dispersive air plugs, slots, air chambers and an air inlet pipe, wherein the axis of the ladle nozzle pocket brick body is provided with vertically-penetrating runner holes and upper nozzle mounting holes, the number of the dispersive air plugs is 6-10, the size of the dispersive air plugs is limited, the air plugs are uniformly distributed in the ladle nozzle pocket brick body in an annular shape, the top ends of the dispersive air plugs extend out of the upper surface of the ladle nozzle pocket brick body, the bottom ends of the dispersive air plugs are inserted in the slots, the slots are used as components of the air chambers and are mutually connected with arc-shaped air chambers, one end of the air inlet pipe is communicated with the air chambers, the other end of the air inlet pipe extends out of the side parts of the ladle nozzle pocket brick body, the invention adopts small-flow argon blowing in the whole process, thereby not only improving the removal rate, and further reduces the ladle casting allowance and improves the blowing-through rate of the ladle argon blowing nozzle pocket brick.
Description
Technical Field
The invention belongs to the technical field of steel metallurgy and steelmaking, and particularly relates to a ladle argon blowing nozzle pocket brick and an argon blowing metallurgy method thereof.
Background
The slag discharging process of the metallurgical reactor comprises two mechanisms of confluence vortex slag discharging and drainage sink pit slag discharging. The sink vortex occurs when the liquid level drops to a certain height (generally called critical height) during the discharge of the vessel, and once formed, the sink vortex causes slagging; the drainage sink pit is generated when the volume flow of the fluid is smaller than the flow of the drainage nozzle when the reactor drains to the final stage, and a slag layer on the surface of the molten pool can enter the drainage nozzle along with the drainage sink pit to generate slag. For steel continuous casting, the slag discharging harm caused by confluence vortex is the largest, and the method is the main reason for steel ladle slag discharging. The LF refining ladle bottom argon blowing is a simple and efficient external refining technology, is widely applied at home and abroad, but has the following problems or defects in production practice: (1) soft blowing at the later stage of LF refining occupies the time of a main process of steel making, is restricted by production matching of an upper process furnace and a lower process furnace, and has insufficient soft blowing time, so that the impurity removal effect is influenced; (2) more than 50% of large-particle foreign impurities are generated when steel ladle slag enters molten steel, and slagging at the last stage of continuous casting steel ladle pouring is a main source of the large-particle foreign impurities, but the existing slagging detection technology detects that the large-particle foreign impurities enter a drainage sink pit and are subjected to slagging, so that the confluence vortex slagging cannot be detected, the steel ladle slagging cannot be inhibited, and a new technology for economically and efficiently controlling the steel ladle slagging needs to be broken through urgently.
Chinese patent document CN111774560A (patent number: 202010726676.4) discloses a breathable upper nozzle pocket block of a microporous ceramic rod of an LF refining ladle and an argon blowing control method thereof, the breathable upper nozzle pocket block comprises an iron ring and the microporous ceramic rod, the diameter d of the microporous ceramic rod is 35-45mm, the height h of the ceramic rod is 140-180 mm, air holes are formed in the ceramic rod along the axial direction of the ceramic rod and are uniformly distributed on the cross section of the ceramic rod, the number of the air holes is 60-120, the inner diameter of each air hole is 0.075-0.1 mm, and the air holes longitudinally penetrate through the upper end surface and the lower end surface of the microporous ceramic rod; before the automatic soft blowing mode is selected, the manual bypass in the argon pipeline system is used for blowing through the air-permeable upper nozzle pocket brick, so that the accurate control of argon blowing flow is realized, the burning-free oxygen blowing rate of the upper nozzle pocket brick of the ladle air-permeable brick is improved, and the service life of the upper nozzle pocket brick of the ladle air-permeable brick is prolonged. The patent technology has the following defects: because the flow of argon blowing of the microporous ceramic rod is large, bubbles formed by argon blowing are large, the removal rate of impurities is low, a ventilation channel in the microporous ceramic rod is a through hole, steel infiltration and blockage are easy, off-line burning and washing time is long, the service life is influenced, the preparation process of the air chamber is complex, and the preparation cost is high.
Chinese patent document CN108273987A (patent number: 201810309436.7) discloses a ladle air-permeable upper nozzle pocket brick and a method for controlling ladle slag discharge, the device comprises a ladle upper nozzle pocket brick body, an air-permeable plug, an air chamber box, an air-permeable plug base, an air blowing pipeline, a steel flowing hole and an upper nozzle mounting hole; the control method comprises the following steps: 1) placing a ladle air-permeable upper nozzle pocket brick at a steel tapping hole at the bottom of a ladle, and communicating an air blowing pipeline penetrating out of the ladle air-permeable upper nozzle pocket brick with an air channel pipeline; 2) when the height of the molten steel in the steel ladle and the height of the steel ladle are equal to 1: 16-35, inert gas is blown into the molten steel through a blowing pipeline, so that a round convex area without a slag layer is formed on the liquid level of the molten steel, and slag falling of the steel ladle is inhibited; 3) when the slag is discharged from the ladle, closing a ladle nozzle and stopping blowing gas through the blowing pipeline; according to the method, argon is blown in at the last stage of pouring, a round convex area without a slag layer is formed on the liquid level of the molten steel, the slag falling of the steel ladle caused by confluence vortex and drainage sink pit is effectively inhibited, the molten steel pouring allowance in the steel ladle is reduced, and the molten steel pouring allowance is reduced by more than 35% on a same scale. The patent technology has the following defects: the number of the vent plugs is 2 or 4, the spacing distance between the vent plugs is large, the distance between the vent plugs and the steel flowing hole is large, the effect of argon blowing for inhibiting confluence vortex and drainage sink pit from causing slag falling of the steel ladle is poor, argon is blown only at the last stage of pouring of the continuous casting steel ladle, argon is not blown at the early and middle stages, the argon blowing metallurgical effect for promoting floating and removing of inclusions is not realized, in addition, the preparation process of the air chamber is complex, and the preparation cost is high.
Chinese patent document CN109732074A (patent number 201910126691.2) discloses a steel ladle dispersion ring permeable upper nozzle pocket brick and an argon blowing metallurgy method thereof, comprising an upper nozzle pocket brick body, a dispersion type permeable ring, a gas chamber box and a gas inlet pipe, wherein the middle part of the steel ladle upper nozzle pocket brick 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, the flow of argon is automatically adjusted according to the change of the net weight of the molten steel in the steel ladle, the argon penetrates the dispersion type permeable ring to form tiny argon bubbles, most of the argon bubbles move upwards, an annular gas curtain barrier is formed around the steel ladle upper nozzle, the molten steel which is about to enter the steel ladle upper nozzle is subjected to gas washing, stable and continuous annular gas flow is formed in the upper nozzle to inhibit upper nozzle nodulation, and at the later stage of steel ladle pouring, confluence vortex and ladle slag sinking caused by ladle drainage pit are effectively inhibited, the invention can reduce the molten steel casting allowance in the ladle by over 36 percent in a same proportion and reduce the electrolytic inclusion weight of a continuous casting billet sample by over 35 percent in a same proportion. The patent technology has the following defects: the air holes are dispersedly distributed in the dispersed air ring, the air permeability is unstable, and in the pouring process, the set value of argon flow is equal to the net weight of the residual molten steel in the steel ladle, the net weight of the molten steel when the steel ladle is full, and the initial argon flow when the steel ladle is full, for example, in embodiment 1 of the invention, when the height of the liquid level of the residual molten steel in the steel ladle is 200mm, the net weight of the residual molten steel in the steel ladle is 16 tons, the net weight of the molten steel when the steel ladle is full is 130 tons, and the set value of argon flow is equal to 16, 130, 100, NL/min, 12.3NL/min, the argon blowing flow is small, the effects of restraining confluence pit and drainage sink in the later pouring stage of the steel ladle to cause slag dropping of the steel ladle are poor, and further, the slag dropping amount and the molten steel pouring allowance of the steel are increased.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a ladle argon blowing nozzle pocket brick and an argon blowing metallurgical method thereof, 6-10 dispersion type vent plugs are annularly arranged on the inner circle of a ladle nozzle pocket brick body, the pore diameter of the vent holes of the dispersion type vent plugs is small, finer bubbles can be generated, inclusions can be captured more easily, the penetration is not easy, the size of the dispersion type vent plugs is limited, and the argon blowing is carried out by adopting proper flow in stages in the whole process, so that the inclusion removal rate is improved, the circumferential rotation speed of steel flow at the later stage of ladle pouring is further inhibited and reduced, the critical height of slag falling of the steel flow in a confluent vortex is reduced, the ladle pouring allowance is further reduced, and the blowing through rate of the ladle argon blowing nozzle pocket brick is improved.
The technical problem to be solved by the invention is realized by adopting the following technical scheme: a ladle argon blowing nozzle pocket brick comprises a ladle nozzle pocket brick body, a dispersive type ventilating plug, a gas chamber and a gas inlet pipe;
the center of the ladle nozzle pocket brick body is sequentially provided with a steel flowing hole and an upper nozzle mounting hole which are mutually penetrated from top to bottom; the dispersive type ventilating plug and the air chamber are sequentially arranged inside the ladle nozzle pocket brick body from top to bottom along the axial direction of the ladle nozzle pocket brick body;
the cross section of the air chamber is annular, the air chamber and the runner hole are coaxially arranged, the number of the dispersion type air-permeable plugs is 6-10, the dispersion type air-permeable plugs are uniformly distributed in an annular shape along the circumferential direction of the air chamber, slots matched with the dispersion type air-permeable plugs are formed in the air chamber, the lower ends of the dispersion type air-permeable plugs are inserted into the slots, and the upper end face of the dispersion type air-permeable plugs is higher than the upper end face of the ladle nozzle brick body; selecting proper quantity of dispersion type vent plugs according to the size of the steel flowing holes;
the dispersive air-permeable plug is in a shape of a circular truncated cone, the diameter y of a top surface circle is 40-50 mm, the diameter x of a bottom surface circle is 50-60 mm, and the height h is 160-200 mm; the dispersive type vent plug is designed into a round table shape because the longitudinal section of the upper part of the steel flowing hole is an inverted isosceles trapezoid, the diameter of the steel flowing hole is sequentially reduced from top to bottom, the diameter of the steel flowing hole at the opening at the top end is the largest, the wall of the ladle nozzle brick body is the thinnest, along with the erosion of the upper part of the dispersive type vent plug, the ventilation surface of the vent plug is increased, the reduction of ventilation caused by the blockage of part of the vent hole is compensated, and the stability of the ventilation is kept;
and an air inlet pipe is arranged at the side part of the air chamber, 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 ladle nozzle pocket brick body.
Preferably, the slot is cylindrical, a cylindrical inner cavity is arranged in the middle of the slot, the diameter of the inner cavity corresponds to the diameter x of the lower end of the dispersion type ventilation plug, and the height e of the slot is 40-50 mm.
Preferably, the height a of the upper end of the dispersion type ventilation plug extending out of the upper surface of the ladle nozzle pocket brick body is 5-10 mm, and the depth b of the bottom end of the dispersion type ventilation plug inserted into the slot is 15-25 mm.
Preferably, the slot is located on a longitudinal center line of the air chamber, that is, the longitudinal center line of the slot is located on the longitudinal center line of the air chamber, and a transverse center line of the slot is overlapped with a transverse center line of the air chamber.
According to the invention, the slot and the air chamber are preferably made of No. 45 steel seamless steel tubes.
Preferably, a seamless steel pipe with the inner diameter matched with the dispersion type ventilation plug is selected to manufacture the slot, the wall thickness m of the seamless steel pipe is 2-2.5 mm, the fit clearance between the dispersion type ventilation plug and the slot is 1-2 mm, the height e of the intercepting slot is 40-50 mm, and the bottom of the seamless steel pipe is internally sealed by a steel plate which is made of the same material and has the same thickness as the seamless steel pipe;
selecting a seamless steel pipe with the outer diameter d of 30-35 mm, bending the seamless steel pipe into an arc shape, manufacturing an air chamber, and cutting the seamless steel pipe in sections according to the length requirement;
the slot and the air chamber are integrally communicated in a circular ring shape.
The invention also provides an argon blowing metallurgical method for utilizing the ladle argon blowing nozzle pocket brick, which comprises the following steps:
1) after the ladle is hoisted to a position to be cast of the continuous casting rotary table, connecting the gas inlet pipe with an argon source pipeline;
2) after the ladle is rotated to a pouring position from a to-be-poured position of the continuous casting rotary table, argon blowing is started while the ladle is poured, and the flow of the argon is 20-25 NL/min;
3) when the height of the liquid level of the molten steel in the continuous casting ladle is reduced to 200mm, adjusting the flow of argon to 25-30 NL/min; simulation research and field application tests prove that when the liquid level of steel in a continuous casting ladle is reduced to be less than 200mm, confluence vortex is formed, so that the flow of argon is further increased when the liquid level is reduced to be 200mm, and the effect of inhibiting the formation of the confluence vortex is achieved;
when the slag is discharged from the ladle, closing a ladle nozzle, and adjusting the flow of argon to 5-10 NL/min after stopping pouring;
4) and after the ladle is rotated to the position to be cast from the casting position of the continuous casting rotary table, closing argon, and disconnecting the gas inlet pipe and the argon source pipeline.
The invention conception of the invention is as follows: besides the arrangement of the air brick for soft blowing of the LF furnace, the dispersive air plug is arranged at the steel tapping hole, so that the purpose of the invention is realized, namely, the argon blowing is performed to promote the floating of impurities in the pouring process of the continuous casting ladle and the slag discharging of the ladle is inhibited in the later pouring stage. The principle of the invention is that based on the fact that the dispersion type vent plugs can generate a large amount of tiny argon bubbles, the larger the number of the argon bubbles is, the denser the argon bubbles is, the more beneficial the inclusion capture is, namely, the more beneficial the floating removal of the inclusions is, the number of the bubbles is directly related to the number and the size of the dispersion type vent plugs, and meanwhile, the ventilation flow is related to the size and the number of the bubbles, and by designing the number and the size of the dispersion type vent plugs, the requirement of the ventilation flow and the requirement of the size and the number of the bubbles can be effectively met, and the better effect of removing the inclusions is realized; and the bubble forms annular air curtain protective screen just in front of flowing the steel hole, can block the slag that is about to get into flowing the steel hole along with the steel stream on the one hand, on the other hand can effectively reduce and flow the steel hole top and arouse the circumferential velocity that the steel stream inhales the swirl, thereby reduce the height of produced suction swirl, because the slag floats on the molten steel surface, the swirl begins to form from the liquid level, and the slag distributes around the swirl, after the height reduction of swirl, the tapping mouth can be kept away from to the swirl lower extreme, thereby effectively reduce the steel stream and take place to converge the critical height that the swirl was descended the sediment, consequently can further reduce the lower sediment in the pouring later stage.
The inner circle of the ladle nozzle holder brick body is annularly provided with 6-10 dispersion type ventilation plugs which are in a round table shape, the diameter y of a top circle is 40-50 mm, the diameter x of a bottom circle is 50-60 mm, the height h is 160-200 mm, the height a of the upper end of each dispersion type ventilation plug extending out of the upper surface of the ladle nozzle holder brick body is 5-10 mm, the depth b of the bottom end of each dispersion type ventilation plug inserted into a slot is 15-25 mm, and the like.
The simulation research experiment of the invention unexpectedly finds that more and smaller argon bubbles can be formed by adopting proper blowing amount, and the more the number of the argon bubbles is, the more the trapping of the impurities is facilitated, thereby being beneficial to promoting the floating removal of the impurities, the excessive blowing amount and the insufficient blowing amount directly influence the size and the quantity of the argon bubbles, the impurity removal rate of the invention is higher than the larger blowing amount adopted by the prior art CN111774560A (patent number: 202010726676.4), meanwhile, the invention designs the steel ladle dispersion ring air-permeable upper nozzle pocket brick and the argon blowing metallurgical method thereof by adopting the dispersion type air-permeable plug ratio CN109732074A (patent number: 201910126691.2), which can more effectively inhibit and reduce the circumferential rotating speed of steel flow in the later period of steel ladle casting and reduce the critical height of steel flow generated confluence vortex slagging, the weight of electrolytic inclusion of a continuous casting billet sample is reduced by more than 14 percent on the same scale, and the casting allowance of molten steel in a steel ladle is reduced by more than 17 percent on the same scale.
In addition, the number, the top surface circle diameter y and the blowing amount of the dispersion type ventilation plugs are directly influenced on the argon blowing metallurgical effect, the number and the top surface circle diameter y of the dispersion type ventilation plugs determine the blowing amount of the ladle argon blowing nozzle brick, the blowing amount is larger when the number of the dispersion type ventilation plugs is larger and the top surface circle diameter y is larger, but the blowing amount is larger when the number and the top surface circle diameter y of the dispersion type ventilation plugs are limited by the thickness of the ladle nozzle brick body and the burning loss degree of the ladle nozzle brick body in actual production needs to be considered, and through a large number of research experiments and application experiments, the invention researches and determines the optimal number, the top surface circle diameter y and the argon blowing flow of the dispersion type ventilation plugs.
As shown in figure 5, a ladle model is prepared in equal proportion, and simulation research results show that the critical gas quantity of argon blowing and molten steel surface slag entrapment of the ladle argon blowing nozzle brick cup is 170NL/min (the simulated gas blowing quantity is 2.04NL/min), the critical gas quantity is the maximum gas quantity, the corresponding impurity removal rate is 37.5 percent, and the impurity removal rate of 20-25 NL/min (the simulated gas blowing quantity is 0.24-0.30 NL/min) is over 70 percent, which is superior to that of CN111774560A (patent number: 202010726676.4) in the prior artThe impurity removal rate is 54-67% of 40-50 NL/min, and meanwhile, the research shows that the blowing amount of the slag-removing agent is 25-30 NL/min under the condition that the height of the liquid level of the residual steel in the ladle is 200mm, the effect of restraining confluent vortex and reducing slag generated by drainage sink pits is optimal, and compared with the prior art CN108273987A (patent number: 201810309436.7), the slag-removing agent has the advantage that the gas flow rate is 2-10 Nm 3 And/h, the molten steel casting allowance converted into 33-167 NL/min is reduced by more than 10% in an identical ratio, so that the larger the blowing amount is, the larger the impurity removal rate is, the invention also researches and determines that the height h of the dispersion type air plug is 160-200 mm according to the corrosion height analysis of the ladle nozzle pocket brick body, and the technical problem that the service lives of the dispersion type air plug and the ladle nozzle pocket brick body are not synchronous is solved.
According to the development process of the dispersion type vent plug, the height a of the upper end of the dispersion type vent plug extending out of the upper surface of the ladle nozzle pocket brick body is 5-10 mm, the dispersion type vent plug can be limited by fixing the part of the dispersion type vent plug higher than the ladle nozzle pocket brick body, the problem that the dispersion type vent plug is difficult to position in the pouring production of the ladle argon blowing nozzle pocket brick is solved, the depth b of the bottom end of the dispersion type vent plug inserted into the slot is 15-25 mm, the fixing and sealing problems of the bottom end of the dispersion type vent plug inserted into the slot are solved, and unexpected technical effects are achieved.
The invention has the beneficial effects that:
1) according to the invention, 6-10 dispersion type ventilation plugs are annularly arranged on the ladle argon blowing nozzle pocket brick as ventilation elements, the diameter of each ventilation hole of each dispersion type ventilation plug is small, so that finer bubbles can be generated, inclusions can be captured more easily, the dispersion type ventilation plugs are not communicated, and steel infiltration is difficult, and meanwhile, the dispersion type ventilation plugs are limited in size, so that small-flow argon blowing in the whole process can be realized in the continuous casting ladle pouring process, molten steel and steel slag are prevented from entering a ventilation channel under the action of static pressure, the blowing-through rate of the ladle argon blowing nozzle pocket brick reaches more than 99.6%, and the steel blowing-through rate is superior to that of CN111774560B (patent number: 202010726676.4), CN108273987A (patent No.: 201810309436.7) and CN108273987A (patent No.: 201810309436.7).
2) The ladle argon blowing nozzle pocket brick adopts a seamless steel pipe made of No. 45 steel to manufacture the slot and the air chamber, the slot and the air chamber are mutually communicated, the whole brick is in a ring shape, the preparation process is simplified, the preparation working hour is shortened, and the preparation cost is reduced.
3) The inner circle of the ladle nozzle pocket brick body is annularly provided with 6-10 dispersion type vent plugs, the blowing amount is 20-25 NL/min, more and smaller argon bubbles can be formed, floating removal of inclusions is facilitated, the inclusion removal rate is over 70%, and the method is superior to that of CN111774560B (patent number: 202010726676.4) at a blowing rate of 40-50 NL/min, the impurity removal rate is 54-67%, and at the same time, the blowing rate of the invention is 25-30 NL/min at a height of 200mm of the residual steel liquid level in the ladle, the effect of suppressing confluence swirl and reducing slag caused by drainage sink pits is best, compared with the prior patent technology CN108273987A (patent number: 201810309436.7) at a gas flow rate of 2-10 Nm 3 The molten steel casting allowance/h (converted into 33-167 NL/min) is reduced by more than 10 percent in proportion, and is reduced by more than 17 percent in proportion to the molten steel casting allowance of the prior art CN108273987A (patent number: 201810309436.7).
Drawings
FIG. 1 is a sectional view of a ladle argon blowing nozzle brick cup structure A-A in the embodiment of the invention;
FIG. 2 is a top view of a ladle argon blowing nozzle brick cup structure in an embodiment of the invention;
FIG. 3 is a sectional view A-A of the air chamber and slot structure and air inlet tube connection in accordance with an embodiment of the present invention;
FIG. 4 is a top view of the air chamber and slot structure and air inlet tube connection in accordance with an embodiment of the present invention;
FIG. 5 is a graph showing the variation of the impurity removal rate under different blowing amounts simulated in the physical simulation test of the present invention;
in the figure, 1 a ladle nozzle pocket brick body; 2, a dispersive air-permeable plug; 3, inserting grooves; 4, an air chamber; 5, air inlet pipe; 6, flowing steel holes; 7 water supply port mounting holes.
Detailed Description
The invention is further illustrated by the following examples and drawings, but is not limited thereto.
In the examples, the anhydrous magnesia ramming mass and the sintered magnesia are conventional refractory materials and are commercially available products.
Example 1
A ladle argon blowing nozzle pocket brick is shown in figures 1, 2, 3 and 4 and comprises a ladle nozzle pocket brick body 1, a dispersion type vent plug 2, a gas chamber 4 and a gas inlet pipe 5.
The center of the ladle nozzle pocket brick body 1 is sequentially provided with a steel flowing hole 6 and an upper nozzle mounting hole 7 which are mutually penetrated from top to bottom; the dispersive type ventilation plug 2 and the air chamber 4 are sequentially arranged inside the ladle nozzle pocket brick body 1 from top to bottom along the axial direction of the ladle nozzle pocket brick body 1.
The cross section of the air chamber 4 is annular, the air chamber 4 and the steel flowing holes 6 are coaxially arranged, the number of the dispersion type vent plugs 2 is 6, the dispersion type vent plugs 2 are uniformly distributed in an annular shape along the circumferential direction of the air chamber 4, the air chamber 4 is provided with slots 3 matched with the dispersion type vent plugs 2, the lower ends of the dispersion type vent plugs 2 are inserted into the slots 3, the bottom ends of the dispersion type vent plugs 2 are inserted and fixed at the upper parts of the slots 3, the shapes, the numbers and the positions of the inner cavities of the slots 3 correspond to those of the dispersion type vent plugs 2, the lower parts of the slots 3 serve as the components of the air chamber and are mutually communicated with the arc-shaped air chamber 4, the slots 3 are cylindrical, the middle parts of the slots are provided with cylindrical inner cavities, the diameters of the inner cavities correspond to the diameter x of the lower ends of the dispersion type vent plugs 2, and the height e of the slots 3 is 50 mm. The slot 3 is positioned on the longitudinal central line of the air chamber 4, and the transverse central line of the slot 3 is superposed with the transverse central line of the air chamber 4.
The upper end surface of the dispersive type air plug 2 is higher than the upper end surface of the ladle nozzle pocket brick body 1. The height a of the upper end of the dispersion type ventilation plug 2 extending out of the upper surface of the ladle nozzle pocket brick body 1 is 10mm, and the depth b of the bottom end of the dispersion type ventilation plug 2 inserted into the slot 3 is 25 mm.
The dispersive type air-permeable plug 2 is in a shape of a circular truncated cone, the diameter y of the top surface circle is 50mm, the diameter x of the bottom surface circle is 60mm, and the height h is 200 mm.
An air inlet pipe 5 is arranged at the side part of the air chamber 4, one end of the air inlet pipe 5 is communicated with the air chamber 4, and the other end of the air inlet pipe extends out of the side part of the ladle nozzle pocket brick body 1.
The invention also provides an integral preparation method of the slot 3 and the air chamber 4, which comprises the following steps:
the slot 3 and the air chamber 4 are made of seamless steel pipes made of No. 45 steel, the slot 3 is made of seamless steel pipes with the outer diameter of 68mm and the wall thickness m of 2.5mm, the fit clearance between the dispersive ventilating plug 2 and the slot 3 is 1.5mm, the height e of the intercepting slot 3 is 50mm, and the bottom of the intercepting slot is internally sealed by steel plates made of the same material and the same thickness as the seamless steel pipes.
Selecting a seamless steel pipe with the outer diameter d of 35mm and the wall thickness of 2.5mm, bending the seamless steel pipe into a circular arc shape to manufacture the air chamber 4, and intercepting according to the length requirement, particularly intercepting according to the distribution position of the dispersive type ventilation plug 2.
The slot 3 and the air chamber 4 are mutually communicated, the whole body is in a ring shape, and finally, the air tightness is checked, so that the integral preparation of the slot 3 and the air chamber 4 is completed.
The invention also provides an argon blowing metallurgical method of the ladle argon blowing nozzle pocket brick, which comprises the following steps:
1) after the ladle is hoisted to the position to be cast of the continuous casting rotary table, the gas inlet pipe 5 is communicated with an argon gas source pipeline.
2) And after the ladle is rotated to the pouring position from the to-be-poured position of the continuous casting rotary table, argon blowing is started while the ladle is poured, and the argon flow is 20 NL/min.
3) And when the height of the liquid level of the steel in the continuous casting ladle is reduced to 200mm, adjusting the flow of the argon gas to be 25NL/min, and when the steel ladle generates slag, closing a water gap of the steel ladle, stopping pouring, and adjusting the flow of the argon gas to be 5 NL/min.
4) And after the ladle is rotated to the position to be cast from the casting position of the continuous casting rotary table, closing argon, and disconnecting the gas inlet pipe 5 from the argon source pipeline.
Example 2
The ladle argon blowing nozzle pocket brick is different from the ladle argon blowing nozzle pocket brick in the embodiment 1 in that:
the number of the dispersion type air permeable plugs 2 is 10.
The diameter y of the top surface circle of the dispersive type air vent plug 2 is 40mm, the diameter x of the bottom surface circle is 50mm, and the height h is 160 mm.
The height e of the slot 3 is 40 mm.
The height a of the upper end of the dispersion type vent plug 2 extending out of the upper surface of the ladle nozzle pocket brick body 1 is 5mm, and the depth b of the bottom end of the dispersion type vent plug 2 inserted into the slot 3 is 15 mm.
The invention also provides an integral preparation method of the slot 3 and the air chamber 4, which comprises the following steps:
the slot 3 and the air chamber 4 are made of seamless steel pipes made of No. 45 steel, the slot 3 is made of seamless steel pipes with the outer diameter of 57mm and the wall thickness m of 2.5mm, the fit clearance between the dispersive type ventilation plug 2 and the slot 3 is 1.5mm, the height e of the intercepting slot 3 is 40mm, and the bottom of the slot is internally sealed by steel plates made of the same materials and the same thickness as the seamless steel pipes.
Selecting a seamless steel pipe with the outer diameter d of 30mm and the wall thickness of 2.5mm, bending the seamless steel pipe into a circular arc shape to manufacture the air chamber 4, and intercepting according to the length requirement, particularly intercepting according to the distribution position of the dispersive type ventilation plug 2.
The slot 3 and the air chamber 4 are mutually communicated and are integrally in a circular ring shape, and finally the air tightness is checked, so that the integral preparation of the slot 3 and the air chamber 4 is completed.
The invention also provides an argon blowing metallurgical method of the ladle argon blowing nozzle pocket brick, which comprises the following steps:
1) after the ladle is hoisted to the position to be cast of the continuous casting rotary table, the gas inlet pipe 5 is communicated with an argon gas source pipeline.
2) And after the ladle is rotated to the pouring position from the to-be-poured position of the continuous casting rotary table, argon starts to be blown while the ladle is poured, and the flow of the argon is 25 NL/min.
3) When the height of the liquid level of the molten steel in the continuous casting ladle is reduced to 200mm, the flow rate of the argon gas is adjusted to 30 NL/min.
When the slag is generated in the ladle, a ladle nozzle is closed, and after the pouring is stopped, the argon flow is adjusted to 10 NL/min.
4) And after the ladle is rotated to the position to be cast from the casting position of the continuous casting rotary table, closing argon, and disconnecting the gas inlet pipe 5 from the argon source pipeline.
Example 3
The ladle argon blowing nozzle pocket brick is different from the ladle argon blowing nozzle pocket brick in the embodiment 1 in that:
the number of the dispersion type air permeable plugs 2 is 9.
The diameter y of the top surface circle of the dispersive type air plug 2 is 45mm, the diameter x of the bottom surface circle is 55mm, and the height h is 180 mm.
The height e of the slot 3 is 45 mm.
The height a of the upper end of the dispersion type ventilation plug 2 extending out of the upper surface of the ladle nozzle pocket brick body 1 is 7mm, and the depth b of the bottom end of the dispersion type ventilation plug 2 inserted into the slot 3 is 20 mm.
The invention also provides an integral preparation method of the slot 3 and the air chamber 4, which comprises the following steps:
the slot 3 and the air chamber 4 are made of seamless steel pipes made of No. 45 steel, the slot 3 is made of seamless steel pipes with the outer diameter of 55mm and the wall thickness m of 2.5mm, the fit clearance between the dispersive type ventilation plug 2 and the slot 3 is 1.5mm, the height e of the intercepting slot 3 is 45mm, and the bottom of the slot is internally sealed by steel plates made of the same materials and the same thickness as the seamless steel pipes.
Selecting a seamless steel pipe with the outer diameter d of 32mm and the wall thickness of 2.5mm, bending the seamless steel pipe into a circular arc shape to manufacture the air chamber 4, and intercepting according to the length requirement, particularly intercepting according to the distribution position of the dispersive type ventilation plug 2.
The slot 3 and the air chamber 4 are mutually communicated, the whole body is in a ring shape, and finally, the air tightness is checked, so that the integral preparation of the slot 3 and the air chamber 4 is completed.
The invention also provides an argon blowing metallurgical method of the ladle argon blowing nozzle pocket brick, which comprises the following steps:
1) after the ladle is hoisted to the position to be cast of the continuous casting rotary table, the gas inlet pipe 5 is communicated with an argon gas source pipeline.
2) And after the ladle is rotated to the pouring position from the to-be-poured position of the continuous casting rotary table, argon blowing is started while the ladle is poured, and the argon flow is 22 NL/min.
3) And when the height of the liquid level of the steel in the continuous casting ladle is reduced to 200mm, adjusting the flow of the argon gas to be 27NL/min, and when the steel ladle generates slag, closing a water gap of the steel ladle, and stopping pouring, adjusting the flow of the argon gas to be 7 NL/min.
4) And after the ladle is rotated to the position to be cast from the casting position of the continuous casting rotary table, closing argon, and disconnecting the gas inlet pipe 5 from the argon source pipeline.
Comparative example 1
In an LF refining ladle microporous ceramic rod breathable upper nozzle pocket brick and an argon blowing control method thereof disclosed in embodiment 1 of Chinese patent document CN111774560B (patent number 202010726676.4), the height of a liquid level of a 130t ladle is 3190mm, and the initial flow value is 50 NL/min.
Comparative example 2
Chinese patent document CN108273987A (patent number: 201810309436.7) discloses an embodiment 2 of a ladle air-permeable upper nozzle pocket brick and a method for controlling ladle slag-off, wherein 130t of a ladle has a ladle liquid level height of 3190mm and argon flow of 5Nm 3 The conversion was 83.3 NL/min.
Comparative example 3
In chinese patent document CN109732074A (patent No. 201910126691.2), embodiment 1 discloses a ladle dispersion ring air-permeable upper nozzle pocket brick and an argon blowing metallurgical method thereof, 130t ladle, and the argon flow automatic control instruction of the argon blowing control system PLC is as follows: firstly, receiving a ladle casting starting signal, starting argon blowing, and setting the initial argon flow as the argon blowing flow determined by ladle soft blowing as 100 NL/min; secondly, in the process of pouring the steel ladle, linearly adjusting argon flow according to the change of the net weight of the molten steel in the steel ladle, wherein the process argon flow set value is the net weight of the residual molten steel in the steel ladle divided by the net weight of the molten steel when the steel ladle is full and is multiplied by the initial argon flow when the steel ladle is full; and thirdly, when the manual judgment method or the steel ladle slag tapping detection method is adopted to judge that slag tapping occurs to the steel ladle or the slag tapping amount reaches a set value, a steel ladle pouring stop signal is received, and argon gas blowing into the steel ladle dispersion ring breathable upper nozzle pocket brick is stopped.
The application conditions of the technical schemes of examples 1 to 3 and comparative examples 1 to 3 in the production of the ultra-low carbon aluminum killed steel DC04 by a slab caster in a certain steel plant are compared, large sample electrolytic samples are respectively taken from a casting blank 1/4 and processed into round bars with the diameter of 60mm and the height of 100mm, large sample electrolytic inclusion detection comparison is carried out, the same slag discharge detection systems are arranged when the molten steel casting allowance for casting the ultra-low carbon aluminum killed steel DC04 is determined by comparison, and the comparison results are shown in the following table 1.
TABLE 1
Through the data comparison in the table 1, compared with the refined steel ladle microporous ceramic rod breathable upper nozzle pocket brick and the argon blowing control method thereof related to the comparative example CN111774560B (patent number: 202010726676.4), the steel ladle argon blowing nozzle pocket brick and the argon blowing metallurgical method thereof related to the invention have the advantages that the weight of electrolytic inclusions in a continuous casting billet sample is reduced by more than 15 percent, the molten steel casting allowance in the steel ladle is reduced by more than 10 percent, and the blowing rate of the steel ladle argon blowing nozzle pocket brick is improved by 0.5 percent; compared with the ladle air-blowing nozzle pocket brick and the method for controlling the slag discharge of the ladle which are related to the comparative example CN108273987A (patent number: 201810309436.7), the ladle air-blowing argon nozzle pocket brick and the argon-blowing metallurgical method thereof have the advantages that the weight of electrolytic inclusion of a continuous casting billet sample is reduced by more than 30 percent on the same scale, the casting allowance of molten steel in the ladle is reduced by more than 15 percent on the same scale, and the blowing-through rate of the ladle argon-blowing nozzle pocket brick is improved by 6 percent on the same scale; compared with the application of a comparative example CN108273987A (patent number: 201810309436.7), the ladle argon-blowing nozzle pocket brick and the argon-blowing metallurgical method thereof have the advantages that the weight of electrolytic inclusions of a continuous casting billet sample is reduced by more than 14 percent on the same scale, the casting allowance of molten steel in a ladle is reduced by more than 17 percent on the same scale, and the blowing-through rate of the ladle argon-blowing nozzle pocket brick is improved by 0.4 percent on the same scale.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments can still be modified, or some technical features of the foregoing embodiments can be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (7)
1. The utility model provides a ladle argon blowing mouth of a river brick cup which characterized in that: comprises a ladle nozzle pocket brick body (1), a dispersive type ventilation plug (2), an air chamber (4) and an air inlet pipe (5);
the center of the ladle nozzle pocket brick body (1) is sequentially provided with a steel flowing hole (6) and an upper nozzle mounting hole (7) which are mutually penetrated from top to bottom; the dispersive type ventilation plug (2) and the air chamber (4) are sequentially arranged inside the ladle nozzle pocket brick body (1) from top to bottom along the axial direction of the ladle nozzle pocket brick body (1);
the cross section of the air chamber (4) is annular, the air chamber (4) and the runner holes (6) are coaxially arranged, the number of the dispersion type vent plugs (2) is 6-10, the dispersion type vent plugs (2) are uniformly distributed in an annular shape along the circumferential direction of the air chamber (4), slots (3) matched with the dispersion type vent plugs (2) are formed in the air chamber (4), the lower ends of the dispersion type vent plugs (2) are inserted into the slots (3), and the upper end faces of the dispersion type vent plugs (2) are higher than the upper end faces of the ladle nozzle block body (1);
the dispersive air-permeable plug (2) is in a shape of a circular truncated cone, the diameter y of a top surface circle is 40-50 mm, the diameter x of a bottom surface circle is 50-60 mm, and the height h is 160-200 mm;
and an air inlet pipe (5) is arranged at the side part of the air chamber (4), one end of the air inlet pipe (5) is communicated with the air chamber (4), and the other end of the air inlet pipe extends out of the side part of the ladle nozzle pocket brick body (1).
2. The ladle argon-blowing nozzle pocket brick as set forth in claim 1, characterized in that: the slot (3) is cylindrical, a cylindrical inner cavity is arranged in the middle of the slot, the diameter of the inner cavity corresponds to the diameter x of the lower end of the dispersion type ventilation plug (2), and the height e of the slot (3) is 40-50 mm.
3. The ladle argon-blowing nozzle pocket brick as set forth in claim 1, characterized in that: the height a of the upper end of the dispersion type ventilation plug (2) extending out of the upper surface of the ladle nozzle pocket brick body (1) is 5-10 mm, and the depth b of the bottom end of the dispersion type ventilation plug (2) inserted into the slot (3) is 15-25 mm.
4. The ladle argon-blowing nozzle pocket block according to claim 1, characterized in that: the slot (3) is positioned on the longitudinal central line of the air chamber (4), and the transverse central line of the slot (3) is superposed with the transverse central line of the air chamber (4).
5. The ladle argon-blowing nozzle pocket brick as set forth in claim 1, characterized in that: the slot (3) and the air chamber (4) are both made of No. 45 steel seamless steel tubes.
6. The ladle argon-blowing nozzle pocket brick according to claim 5, characterized in that: selecting a seamless steel pipe with the inner diameter matched with the dispersion type ventilation plug (2) to manufacture the slot (3), wherein the wall thickness m of the seamless steel pipe is 2-2.5 mm, the fit clearance between the dispersion type ventilation plug (2) and the slot (3) is 1-2 mm, the height e of the intercepting slot (3) is 40-50 mm, and the bottom of the seamless steel pipe is internally sealed by adopting a steel plate which is the same as the seamless steel pipe in material and thickness;
selecting a seamless steel pipe with the outer diameter d of 30-35 mm, bending the seamless steel pipe into a circular arc shape to manufacture an air chamber (4), and cutting the seamless steel pipe in sections according to the length requirement;
the inserting groove (3) and the air chamber (4) are integrally communicated in a circular ring shape.
7. An argon blowing metallurgy method using the ladle argon blowing nozzle pocket brick as claimed in any one of claims 1 to 6 is characterized by comprising the following steps:
1) after the ladle is hoisted to a position to be cast of the continuous casting rotary table, the gas inlet pipe (5) is communicated with an argon gas source pipeline;
2) after the ladle is rotated to a pouring position from a to-be-poured position of the continuous casting rotary table, argon blowing is started while the ladle is poured, and the flow of the argon is 20-25 NL/min;
3) when the height of the liquid level of the molten steel in the continuous casting ladle is reduced to 200mm, adjusting the flow of argon to 25-30 NL/min;
when the slag is discharged from the ladle, closing a ladle nozzle, and adjusting the flow of argon to 5-10 NL/min after stopping pouring;
4) and after the ladle is rotated to the position to be cast from the casting position of the continuous casting rotary table, argon is closed, and the air inlet pipe (5) is disconnected with the argon source pipeline.
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| CN202210689041.0A CN115026273B (en) | 2022-06-16 | 2022-06-16 | Ladle argon blowing nozzle pocket brick and argon blowing metallurgical method thereof |
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