CN111195721A - Drainage sand discharging device and method for improving purity of molten steel - Google Patents
Drainage sand discharging device and method for improving purity of molten steel Download PDFInfo
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- CN111195721A CN111195721A CN201811374972.1A CN201811374972A CN111195721A CN 111195721 A CN111195721 A CN 111195721A CN 201811374972 A CN201811374972 A CN 201811374972A CN 111195721 A CN111195721 A CN 111195721A
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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
- B22D41/14—Closures
- B22D41/44—Consumable closure means, i.e. closure means being used only once
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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
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
- B22D43/001—Retaining slag during pouring molten metal
- B22D43/002—Retaining slag during pouring molten metal by using floating means
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Abstract
The invention discloses a drainage sand discharging device for improving molten steel purity and a discharging method thereof, wherein the drainage sand discharging device comprises a tundish, wherein a slag blocking dam, a slag blocking weir and a metal baffle are arranged in the tundish, the tundish is divided into a steel bearing chamber and a steel pouring chamber, a steel through hole is formed in the slag blocking weir, and the metal baffle is connected to the steel through hole; the steel bearing chamber is internally provided with a long water gap, a turbulence suppressor and a bottom blowing device; a water outlet and a stopper rod are arranged in the steel casting chamber; still be equipped with overflow mouth and inert gas pipeline on the middle package, the inert gas pipeline includes main trachea and assists the trachea, all links there is the nozzle on main trachea and the assistance trachea, and the overflow mouth sets up with main trachea relatively, and on the slag-stopping dam was located to main trachea, assisted the trachea and locate on the package wall of middle package between overflow mouth and the main trachea, and assisted the trachea and be the slope and arrange, makes and assists the trachea nozzle all towards overflow mouth direction setting. The drainage sand discharging device can effectively discharge the drainage sand entering the tundish, thereby reducing the pollution of the drainage sand to molten steel and improving the cleanliness of the molten steel.
Description
Technical Field
The invention relates to the technical field of continuous casting, in particular to a drainage sand discharging device and a drainage sand discharging method for improving purity of molten steel.
Background
The drainage sand is used for blocking and draining the pouring hole at the bottom of the steel ladle and is an indispensable refractory material for the steel ladle, and before the steel ladle is ready to be poured into molten steel, the pouring hole is blocked by the drainage sand, and then the molten steel is poured into the steel ladle. For the use of the drainage sand, the existing drainage sand generally has better high-temperature sintering performance, namely, the drainage sand can be quickly encrusted after the contact of molten steel to form a sintered shell capable of preventing the molten steel from flowing out. And the drainage sand at the lower part plays a certain role in flowing. When the ladle is poured, the sliding plate is opened, the drainage sand arranged in the water gap can automatically fall down, and the sintered shell is damaged due to the static pressure of the molten steel, so that the smooth pouring is realized.
However, the drainage sands used in the industry are mixtures of various metal oxides or non-metal oxides. The use of the drainage sand realizes smooth tapping, and simultaneously introduces inclusions harmful to molten steel, and the inclusions are difficult to remove in the subsequent process and finally become harmful inclusions influencing the quality and the performance of steel products in the finished steel products. In the process of developing high-quality steel and new steel grades, the most basic task is to improve the cleanliness of molten steel.
In the patents which are disclosed at present, many patents relating to the removal of the hazards of drainage sand exist, for example, patent CN 10537476a proposes a drainage method and a device thereof for improving the cleanliness of molten steel, the method comprises the following steps of filling drainage materials into an injection hole of a drainage device in a filling mode: in the invention, although the amount of the drainage sand is reduced, when C powder and other raw materials are adopted, new materials are brought in, and meanwhile, the flowing performance of the C powder and other raw materials is different from that of the drainage sand, so that an accident that the ladle cannot be opened can be caused.
Patent CN 102218527A proposes a method for removing ladle drainage sand, which is characterized by comprising the following steps: (1) fixing the high-pressure inert gas purging pipeline to a manipulator for installing a protective sleeve; (2) rotating the ladle to be cast to a casting position, and sleeving a casting protective sleeve, wherein the distance from the lower end of the protective sleeve to the upper edge of the tundish is 100 mm; (3) aligning a gas outlet of a high-pressure inert gas purging pipeline to a liquid outlet at the lower end of the bale protection sleeve, enabling the distance between the gas outlet of the high-pressure inert gas purging pipeline and the liquid outlet at the lower end of the bale protection sleeve to be 30-70mm, opening a high-pressure inert gas cut-off valve, and purging the high-pressure inert gas by aligning the high-pressure inert gas to the liquid outlet at the lower end of the bale protection sleeve, wherein the pressure of the inert gas is 1.0-1.2 MPa; (4) and (4) casting the ladle, blowing the flowing drainage sand out of the ladle by using high-pressure inert gas, and quickly closing the high-pressure gas cut-off valve after the steel flow flows down. Although the invention can blow off a part of small-particle drainage sand by using argon, the invention does not exclude large-particle drainage sand from entering the tundish, so that accidents are easy to occur in the falling process of molten steel, and in addition, the blown drainage sand can pollute the surrounding environment of the tundish and bring adverse effects to human bodies.
Patent CN 204770645 proposes a ladle drainage sand removing device, and provides a ladle drainage sand removing device which is characterized by comprising a bracket, a clamp and a sand discharge barrel; the clamp comprises a clamp handle, a jaw and a pin shaft, the two clamp handles with arc jaws at the front parts are movably connected together through the pin shaft, the clamp is movably connected on the bracket through a rotating shaft, an inclined sand discharge barrel is clamped in the jaw of the clamp, and an inclined fracture is cut at the upper end of the sand discharge barrel. When the device is used for removing the drainage sand, the device and the operation are additionally added, and the device is difficult to install under certain working conditions.
Although the patents mentioned above propose solutions for removing the drainage sand from several aspects, some of the solutions introduce additional new substances, some of the solutions add larger equipment structure, and none of the solutions propose solutions for removing the drainage sand into the molten steel, so the removal process is not complete.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a drainage sand discharging device and a drainage sand discharging method for improving the purity of molten steel, which can effectively discharge drainage sand entering a tundish, thereby reducing the pollution of the drainage sand to the molten steel, improving the purity of the molten steel, improving the quality and yield of continuous casting billets and reducing the influence of the drainage sand on a covering agent.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, a drainage sand discharging device for improving molten steel purity, includes: the tundish is internally provided with a slag dam, a slag weir and a metal baffle, the tundish is internally divided into a steel bearing chamber and a steel pouring chamber, the slag weir is provided with a steel through hole, and the metal baffle is connected to the steel through hole;
the steel bearing chamber is internally provided with a long water gap, a turbulence suppressor and a bottom blowing device, the long water gap is arranged above the steel bearing chamber, the turbulence suppressor and the bottom blowing device are arranged at the bottom of the steel bearing chamber, and the turbulence suppressor is positioned below the long water gap;
the pouring chamber is internally provided with a water outlet and a stopper rod, the stopper rod is arranged above the pouring chamber, and the water outlet is arranged at the bottom of the pouring chamber and correspondingly arranged below the stopper rod;
still be equipped with overflow mouth and inert gas pipeline on the middle package, the inert gas pipeline includes: the main trachea and the supplementary trachea, main trachea and the supplementary trachea all link there is the nozzle, and the overflow mouth sets up with main trachea relatively, and on the pushing off the slag dam was located to main trachea, on the supplementary trachea located the package wall of middle package between overflow mouth and the main trachea, and the supplementary trachea was the slope and arranges, makes the supplementary trachea nozzle all set up towards overflow mouth direction.
The slag blocking dam is arranged at the top in the tundish, the slag blocking dam is arranged at the bottom in the tundish, and the slag blocking dam are arranged in a staggered mode.
The tundish is made of refractory materials, and the outer part of the tundish is a steel shell.
The metal baffle is positioned in the steel bearing chamber.
The main air pipe nozzle is arranged in an umbrella shape, and the auxiliary air pipe nozzle forms an included angle of 45-90 degrees with the horizontal plane of the bag wall.
On the other hand, the drainage sand discharging method for improving the purity of the molten steel comprises the following process steps:
1) after the ladle is poured, molten steel and drainage sand enter a turbulence inhibitor of a steel bearing chamber and a ladle bottom position through a long water gap, the drainage sand and initial slag inclusion in the tundish rapidly move to the position near a slag weir along with the driving of the molten steel, the liquid level of the molten steel floats upwards due to the blocking of a metal baffle plate, the drainage sand and the slag inclusion are driven to float upwards, and the metal baffle plate gradually starts to melt;
2) when the molten steel rises to the height of the slag dam, a bottom blowing device arranged in the steel bearing chamber starts blowing inert gas in a small amount, and the bottom blowing device is used for accelerating floating of the drainage sand and slag inclusion in the molten steel to form a scum layer;
3) when the molten steel continues to rise, the metal baffle is completely melted, the molten steel enters the steel pouring chamber through the steel through hole of the slag weir, the molten steel level is still in the rising process because the steel through amount of the long nozzle is larger than that of the steel through hole, and the molten steel entering the steel pouring chamber is clean due to the purification effect of the bottom blowing device;
4) after the liquid level of the molten steel rises to the working liquid level of the tundish, the drainage sand in the steel bearing chamber is gradually gathered into a scum layer, the liquid level of the molten steel which is gradually raised in the steel bearing chamber rises to an overflow position, the blowing amount of the main air pipe and the auxiliary air pipe is increased at the moment, and as the nozzle of the main air pipe is arranged in an umbrella shape and the nozzle of the auxiliary air pipe is arranged in an inclined way towards the direction of an overflow port, a driving effect is formed on the scum layer on the surface of the molten steel in the blowing process of the main air pipe and the auxiliary air pipe, so that the scum layer flows towards the overflow port and is discharged into a slag pot through the overflow port;
5) after deslagging is finished, reducing the air blowing amount of the main air pipe and the auxiliary air pipe, reducing the liquid level of molten steel to a working position, adding a tundish covering agent, and finishing the removal process of the drainage sand.
The thickness of the metal baffle plate is related to the rising speed of the liquid level of the steel bearing chamber in the casting process, and when the rising speed of the liquid level is 0.1-0.3 m/min, the thickness of the steel plate is 1-2 mm; when the liquid level rising speed is 0.3-0.6 m/min, the thickness of the steel plate is 2-2.5 mm; when the liquid level rising speed is 0.6-1 m/min, the thickness of the steel plate is 2.5-3 mm; when the liquid level rising speed is more than 1m/min, the thickness of the steel plate is 3-3.5 mm.
When the liquid level of the steel bearing chamber is more than 200mm, the bottom blowing device starts blowing air, and the blowing amount is 0.2-0.5L/min; when the liquid level of the steel bearing chamber reaches the working liquid level, the air blowing amount is 0.5-1L/min.
Setting the air blowing amount of the main air pipe and the auxiliary air pipe, wherein after baking of the tundish is finished and before casting is started, the air flow is 5-10L/min, and in the casting starting process, the air flow is set to be 10-15L/min; when the liquid level rises to the overflow steel liquid level, the air flow is set to be 1-5L/min; after the slag discharge of the tundish is finished and the covering agent is added, the gas flow of the gas path is set to be 0.1-1L/min.
In the technical scheme, the drainage sand discharging device and the drainage sand discharging method for improving the purity of molten steel, which are provided by the invention, have the following beneficial effects:
1) the invention can remove the drainage sand entering the tundish and improve the purity of the molten steel;
2) the method can improve the yield of the initial continuous casting billet, and does not have the defects caused by the drainage sand;
3) the device is simple and easy to implement, does not increase excessive equipment, and has small investment and high return;
4) the method removes the drainage sand in the scum, does not cause the drainage sand to react with the covering agent, and avoids secondary pollution to the molten steel;
5) the invention can remove the impurities and refractory falling particles staying in the tundish at the initial casting stage, so that the purity of the molten steel is further improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the apparatus of the present invention;
FIG. 2 is a top view of the steel receiving chamber of FIG. 1;
FIG. 3 is a schematic view of the scum layer under the action of the main and auxiliary air pipes of the apparatus of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Referring to fig. 1 to 3, the present invention provides a drainage sand discharging device for improving molten steel purity, including: the tundish 1 is made of refractory materials, the outside of the tundish is made of a steel shell, a slag blocking dam 2, a slag blocking weir 3 and a metal baffle plate 4 are arranged in the tundish 1, the tundish 1 is internally divided into a steel bearing chamber 5 and a steel casting chamber 6, a steel through hole 7 is formed in the slag blocking weir 3, the metal baffle plate 4 is connected to the steel through hole 7, the metal baffle plate 4 is arranged in the tundish 1 in advance at the front part (located in the steel bearing chamber 5) of the steel through hole 7 on the slag blocking weir 3, and the front part is used for blocking the initial molten steel from flowing through.
Preferably, a long nozzle 8, a turbulence suppressor 9 and a bottom blowing device 10 are arranged in the steel bearing chamber 5, the long nozzle 8 is arranged above the steel bearing chamber 5, the turbulence suppressor 9 and the bottom blowing device 10 are both arranged at the bottom of the steel bearing chamber 5, and the turbulence suppressor 9 is positioned below the long nozzle 8.
Preferably, a water outlet 11 and a stopper rod 12 are arranged in the casting chamber 6, the stopper rod 12 is arranged above the casting chamber 6, and the water outlet 11 is arranged at the bottom of the casting chamber 6 and correspondingly below the stopper rod 12.
Preferably, still be equipped with overflow mouth 13 and inert gas pipeline on the middle package, the inert gas pipeline includes: main trachea 14 and supplementary trachea 15, all there is the nozzle on main trachea 14 and the supplementary trachea 15, overflow mouth 13 sets up with main trachea 14 relatively, and on main trachea 14 located slag dam 2, supplementary trachea 15 located on the package wall of pouring basket 1 between overflow mouth 14 and the main trachea 14, and supplementary trachea 15 is the slope and arranges, make the nozzle on the supplementary trachea 15 all set up towards overflow mouth 13 direction, the nozzle is umbrella-shaped setting on the main trachea 14, it personally submits 45 ~ 90 contained angles with the level of package wall to assist trachea 15 to go up the nozzle.
Preferably, the slag blocking dam 2 is arranged at the top of the tundish 1, the slag blocking weir 3 is arranged at the bottom of the tundish 1, and the slag blocking dam 2 and the slag blocking weir 3 are arranged in a staggered manner.
The invention also provides a drainage sand discharging method for improving the purity of molten steel, which comprises the following process steps:
1) after the ladle is poured, molten steel 16 and drainage sand enter a turbulence suppressor 9 and a ladle bottom position of a steel bearing chamber 5 through a long water gap 8, the drainage sand and initial slag inclusion in a tundish 1 rapidly move to a position near a slag weir 3 along with the driving of the molten steel 16, the liquid level of the molten steel 16 floats upwards due to the blocking of a metal baffle 4, the drainage sand and the slag inclusion are driven to float upwards, and at the moment, the metal baffle 4 gradually starts to melt;
2) when the molten steel 16 rises to the height of the slag dam 2, the bottom blowing device 10 arranged in the steel bearing chamber 5 starts blowing inert gas in a small amount to form bubbles 17, and the bubbles 17 accelerate floating of the drainage sand and slag inclusion in the molten steel 16 in the floating process to form a scum layer 18;
3) when the molten steel 16 continues to rise to completely melt the metal baffle 4, the molten steel 16 enters the steel casting chamber 6 through the steel through hole 7 of the slag weir 3, the liquid level of the molten steel 16 is still in the rising process because the steel through amount of the long nozzle 8 is larger than that of the steel through hole 7, and the molten steel 16 entering the steel casting chamber 6 is clean due to the purification effect of the bottom air blowing device 10;
4) after the liquid level of the molten steel 16 rises to the working liquid level of the tundish 1, the drainage sand in the steel bearing chamber 5 is gradually gathered into the scum layer 18, the liquid level of the molten steel 16 which is gradually raised in the steel bearing chamber 5 rises to an overflow position, the air blowing amount of the main air pipe 14 and the auxiliary air pipe 15 is increased at the moment, as the upper nozzle of the main air pipe 14 is arranged in an umbrella shape and the upper nozzle of the auxiliary air pipe 15 is obliquely arranged towards the direction of the overflow port 13, a driving effect is formed on the scum layer 18 on the surface of the molten steel 16 in the air blowing process of the main air pipe 14 and the auxiliary air pipe 15, so that the scum layer 18 flows towards the overflow port 13 and is discharged into a slag pot through the overflow port 13;
5) after deslagging is finished, the air blowing amount of the main air pipe 14 and the auxiliary air pipe 15 is reduced, the liquid level of the molten steel 16 is reduced to a working position, a tundish covering agent is added, and the removal process of the drainage sand is finished.
Preferably, the thickness of the metal baffle 4 is related to the liquid level rising speed of the steel bearing chamber 5 in the casting process, and when the liquid level rising speed is 0.1-0.3 m/min, the thickness of the steel plate is 1-2 mm; when the liquid level rising speed is 0.3-0.6 m/min, the thickness of the steel plate is 2-2.5 mm; when the liquid level rising speed is 0.6-1 m/min, the thickness of the steel plate is 2.5-3 mm; when the liquid level rising speed is more than 1m/min, the thickness of the steel plate is 3-3.5 mm.
Preferably, when the liquid level of the steel bearing chamber 5 is more than 200mm, the bottom blowing device 10 starts blowing air, and the blowing amount is 0.2-0.5L/min; when the liquid level of the steel bearing chamber 5 reaches the working liquid level, the air blowing amount is 0.5-1L/min.
Preferably, the air blowing amount of the main air pipe 14 and the auxiliary air pipe 15 is set, after the baking of the tundish 1 is finished and before the casting is started, the air flow is 5-10L/min, and in the casting starting process, the air flow is set to be 10-15L/min; when the liquid level 16 rises to the overflow steel liquid level, the air flow is set to be 1-5L/min; after the slag discharge of the tundish 1 is finished and the covering agent is added, the gas flow of the gas path is set to be 0.1-1L/min.
Example 1
The tundish is a 25t channel type single-flow tundish and is divided into a steel bearing chamber and a steel pouring chamber, the two chambers are connected through two channels, the thickness of the metal baffle is 2mm, the metal baffle is arranged at the inlet of the channel when the steel pouring is started, after the steel pouring is started, the drainage sand falls into the steel bearing chamber of the tundish before the molten steel, and then the drainage sand is driven by the molten steel to move in the steel bearing chamber of the tundish, when the liquid level reaches the channel, the molten steel cannot rapidly enter the channel due to the blocking of the metal baffle, and at the moment, the liquid level of the molten steel rapidly rises to submerge the position of the channel. As the molten steel increases, the metal baffle melts, and the molten steel enters the channel and flows into the steel casting chamber. When the liquid level in the steel bearing chamber rises to more than 200mm, the gas blowing device at the bottom of the tundish is started, the gas flow is set to be 0.2L/min, and when the liquid level of the molten steel rises to the working liquid level, the gas flow blown by the bottom is adjusted to be 0.5L/min.
The flow of the main air pipe and the auxiliary air pipe of the tundish is set to be 5L/min before casting, the flow of the main air pipe and the auxiliary air pipe is set to be 12L/min in the casting process, the flow of the main air pipe and the auxiliary air pipe is set to be 2L/min when the liquid level of molten steel in the tundish rises to a steel overflow level, and the flow of the main air pipe and the auxiliary air pipe is set to be 0.2L/min after slag discharge is finished.
Example 2
The tundish is a 30t channel type single-flow tundish and is divided into a steel bearing chamber and a steel pouring chamber, the two chambers are connected through two channels, the thickness of the metal baffle is 2.5mm, the metal baffle is arranged at the inlet of the channel when pouring, after pouring, the drainage sand falls into the steel bearing chamber of the tundish before the molten steel, and then is driven by the molten steel to move in the steel bearing chamber of the tundish, when the liquid level reaches the channel, the molten steel cannot rapidly enter the channel due to the blocking of the metal baffle, and at the moment, the liquid level of the molten steel rapidly rises to submerge the position of the channel. As the molten steel increases, the metal baffle melts, and the molten steel enters the channel and flows into the steel casting chamber. When the liquid level in the steel bearing chamber rises to more than 220mm, the gas blowing device at the bottom of the tundish is started, the gas flow is set to be 0.3L/min, and when the liquid level of the molten steel rises to the working liquid level, the gas flow blown by the bottom is adjusted to be 0.6L/min.
The flow of the main air pipe and the auxiliary air pipe of the tundish is set to be 6L/min before casting, the flow of the main air pipe and the auxiliary air pipe is set to be 15L/min in the casting process, the flow of the main air pipe and the auxiliary air pipe is set to be 3L/min when the liquid level of molten steel in the tundish rises to a steel overflow level, and the flow of the main air pipe and the auxiliary air pipe is set to be 0.3L/min after slag discharge is finished.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (9)
1. A drainage sand discharging device for improving molten steel purity comprises: the middle package, its characterized in that: a slag blocking dam, a slag blocking weir and a metal baffle are arranged in the tundish, the tundish is divided into a steel bearing chamber and a steel pouring chamber, a steel through hole is formed in the slag blocking weir, and the metal baffle is connected to the steel through hole;
the steel bearing chamber is internally provided with a long water gap, a turbulence suppressor and a bottom blowing device, the long water gap is arranged above the steel bearing chamber, the turbulence suppressor and the bottom blowing device are arranged at the bottom of the steel bearing chamber, and the turbulence suppressor is positioned below the long water gap;
the pouring chamber is internally provided with a water outlet and a stopper rod, the stopper rod is arranged above the pouring chamber, and the water outlet is arranged at the bottom of the pouring chamber and correspondingly arranged below the stopper rod;
still be equipped with overflow mouth and inert gas pipeline on the middle package, the inert gas pipeline includes: the main trachea and the supplementary trachea, main trachea and the supplementary trachea all link there is the nozzle, and the overflow mouth sets up with main trachea relatively, and on the pushing off the slag dam was located to main trachea, on the supplementary trachea located the package wall of middle package between overflow mouth and the main trachea, and the supplementary trachea was the slope and arranges, makes the supplementary trachea nozzle all set up towards overflow mouth direction.
2. The apparatus of claim 1, wherein the apparatus further comprises: the slag blocking dam is arranged at the top in the tundish, the slag blocking dam is arranged at the bottom in the tundish, and the slag blocking dam are arranged in a staggered mode.
3. The apparatus of claim 1, wherein the apparatus further comprises: the tundish is made of refractory materials, and the outer part of the tundish is a steel shell.
4. The apparatus of claim 1, wherein the apparatus further comprises: the metal baffle is positioned in the steel bearing chamber.
5. The apparatus of claim 1, wherein the apparatus further comprises: the main air pipe nozzle is arranged in an umbrella shape, and the auxiliary air pipe nozzle forms an included angle of 45-90 degrees with the horizontal plane of the bag wall.
6. The method for draining the drainage sand for improving the purity of the molten steel according to any one of claims 1 to 5, which is characterized by comprising the following process steps of:
1) after the ladle is poured, molten steel and drainage sand enter a turbulence inhibitor of a steel bearing chamber and a ladle bottom position through a long water gap, the drainage sand and initial slag inclusion in the tundish rapidly move to the position near a slag weir along with the driving of the molten steel, the liquid level of the molten steel floats upwards due to the blocking of a metal baffle plate, the drainage sand and the slag inclusion are driven to float upwards, and the metal baffle plate gradually starts to melt;
2) when the molten steel rises to the height of the slag dam, a bottom blowing device arranged in the steel bearing chamber starts blowing inert gas in a small amount, and the bottom blowing device is used for accelerating floating of the drainage sand and slag inclusion in the molten steel to form a scum layer;
3) when the molten steel continues to rise, the metal baffle is completely melted, the molten steel enters the steel pouring chamber through the steel through hole of the slag weir, the molten steel level is still in the rising process because the steel through amount of the long nozzle is larger than that of the steel through hole, and the molten steel entering the steel pouring chamber is clean due to the purification effect of the bottom blowing device;
4) after the liquid level of the molten steel rises to the working liquid level of the tundish, the drainage sand in the steel bearing chamber is gradually gathered into a scum layer, the liquid level of the molten steel which is gradually raised in the steel bearing chamber rises to an overflow position, the blowing amount of the main air pipe and the auxiliary air pipe is increased at the moment, and as the nozzle of the main air pipe is arranged in an umbrella shape and the nozzle of the auxiliary air pipe is arranged in an inclined way towards the direction of an overflow port, a driving effect is formed on the scum layer on the surface of the molten steel in the blowing process of the main air pipe and the auxiliary air pipe, so that the scum layer flows towards the overflow port and is discharged into a slag pot through the overflow port;
5) after deslagging is finished, reducing the air blowing amount of the main air pipe and the auxiliary air pipe, reducing the liquid level of molten steel to a working position, adding a tundish covering agent, and finishing the removal process of the drainage sand.
7. The method for discharging the drainage sand for improving the purity of the molten steel according to claim 6, wherein the method comprises the following steps: the thickness of the metal baffle plate is related to the rising speed of the liquid level of the steel bearing chamber in the casting process, and when the rising speed of the liquid level is 0.1-0.3 m/min, the thickness of the steel plate is 1-2 mm; when the liquid level rising speed is 0.3-0.6 m/min, the thickness of the steel plate is 2-2.5 mm; when the liquid level rising speed is 0.6-1 m/min, the thickness of the steel plate is 2.5-3 mm; when the liquid level rising speed is more than 1m/min, the thickness of the steel plate is 3-3.5 mm.
8. The method for discharging the drainage sand for improving the purity of the molten steel according to claim 6, wherein the method comprises the following steps: when the liquid level of the steel bearing chamber is more than 200mm, the bottom blowing device starts blowing air, and the blowing amount is 0.2-0.5L/min; when the liquid level of the steel bearing chamber reaches the working liquid level, the air blowing amount is 0.5-1L/min.
9. The method for discharging the drainage sand for improving the purity of the molten steel according to claim 6, wherein the method comprises the following steps: setting the air blowing amount of the main air pipe and the auxiliary air pipe, wherein after baking of the tundish is finished and before casting is started, the air flow is 5-10L/min, and in the casting starting process, the air flow is set to be 10-15L/min; when the liquid level rises to the overflow steel liquid level, the air flow is set to be 1-5L/min; after the slag discharge of the tundish is finished and the covering agent is added, the gas flow of the gas path is set to be 0.1-1L/min.
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Application publication date: 20200526 |