CN114891949A - Converter sliding steel tapping hole and whole-process steel tapping slag stopping method - Google Patents
Converter sliding steel tapping hole and whole-process steel tapping slag stopping method Download PDFInfo
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- CN114891949A CN114891949A CN202210686939.2A CN202210686939A CN114891949A CN 114891949 A CN114891949 A CN 114891949A CN 202210686939 A CN202210686939 A CN 202210686939A CN 114891949 A CN114891949 A CN 114891949A
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- 238000010079 rubber tapping Methods 0.000 title claims abstract description 268
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 212
- 239000010959 steel Substances 0.000 title claims abstract description 212
- 239000002893 slag Substances 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 52
- 239000011449 brick Substances 0.000 claims abstract description 140
- 239000000919 ceramic Substances 0.000 claims abstract description 131
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 94
- 229910052786 argon Inorganic materials 0.000 claims abstract description 47
- 238000009434 installation Methods 0.000 claims description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 31
- 230000007246 mechanism Effects 0.000 claims description 17
- 229910052742 iron Inorganic materials 0.000 claims description 14
- 230000000903 blocking effect Effects 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000000462 isostatic pressing Methods 0.000 claims description 7
- 210000001503 joint Anatomy 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 5
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 4
- 239000000292 calcium oxide Substances 0.000 claims description 4
- 238000005245 sintering Methods 0.000 claims description 4
- RWDBMHZWXLUGIB-UHFFFAOYSA-N [C].[Mg] Chemical compound [C].[Mg] RWDBMHZWXLUGIB-UHFFFAOYSA-N 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 239000010431 corundum Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 229910001018 Cast iron Inorganic materials 0.000 claims description 2
- 230000002829 reductive effect Effects 0.000 abstract description 19
- 238000007664 blowing Methods 0.000 abstract description 18
- 230000008569 process Effects 0.000 abstract description 17
- 230000007547 defect Effects 0.000 abstract description 7
- 230000004888 barrier function Effects 0.000 abstract description 6
- 238000009991 scouring Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 238000004886 process control Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000024121 nodulation Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000009865 steel metallurgy Methods 0.000 description 1
- 238000007920 subcutaneous administration Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Classifications
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
- C21C5/445—Lining or repairing the taphole
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4653—Tapholes; Opening or plugging thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Furnace Charging Or Discharging (AREA)
Abstract
The invention relates to a sliding steel-tapping hole of a converter and a whole-process steel-tapping slag-stopping method, wherein the center of the cross section of a permeable ceramic rod is arranged between the center line of the cross section of a brick body of the steel-tapping hole and the outer ring of the cross section of the brick body of the steel-tapping hole, the distance between the outer ring of the cross section of the permeable ceramic rod and the outer ring of the cross section of the brick body of the steel-tapping hole is limited to be 20-25 mm, and after argon is blown in, argon bubbles form an annular air curtain barrier right in front of the periphery of the steel-tapping hole, so that on one hand, steel slag entering the steel-tapping hole along with steel flow is stopped, on the other hand, the height of a vortex sucked above the steel-tapping hole is effectively reduced, the key technical problem that the steel slag is mixed into the steel flow flowing out of the steel-tapping hole in the steel-tapping process is solved, the defect that the middle-term slag cannot be stopped by a sliding plate of the existing sliding steel-tapping hole of the converter is eliminated, the invention realizes the full-process control slag-tapping of the converter through the blowing slag-stopping and the sliding plate slag stopping, further reducing the slag discharge amount of the converter, reducing the corrosion and scouring of the steel slag on the inner wall of the steel runner and prolonging the service life.
Description
Technical Field
The invention relates to a sliding steel tapping hole of a converter and a slag stopping method for whole-process steel tapping, belonging to the technical field of steel metallurgy and steelmaking.
Background
In order to optimize converter tapping slag stopping technology at home and abroad, more than ten slag stopping methods such as a pneumatic slag stopping method, an electromagnetic slag stopping method, a vacuum slag suction method, a siphon tapping method and the like are invented in sequence, but the slag stopping success rate is low, the effect is not ideal, and in recent years, the converter sliding tapping hole slag control tapping technology developed at home has the advantages of high slag stopping success rate, good slag stopping effect and wide application, but has the following problems or defects in production and application: (1) the sliding steel-tapping hole of the converter adopts a sliding plate to block slag, only 30% of early-stage slag and 40% of later-stage slag can be blocked, and 30% of middle-stage slag in the steel-tapping process can not be blocked, wherein the middle-stage slag mainly refers to steel slag which is involved in molten steel and enters the steel-tapping hole in the steel-tapping process, but the existing steel-tapping slag blocking technology can not effectively block the middle-stage slag; (2) the steel tapping hole part generates rotational flow in the steel tapping process, steel slag is involved into molten steel and enters the sliding steel tapping hole, so that the erosion and the scouring of the inner walls of the steel tapping hole, the inner water gap and the outer water gap steel tapping hole are aggravated, the service life is reduced, and the operating rate of the converter is influenced; (3) the steel slag enters the sliding steel tapping hole along with the molten steel, and when the sliding plate is closed to block the slag, the steel slag can enter the slide way between the sliding plates, so that slag is clamped between the upper sliding plate brick and the lower sliding plate brick, the damage to the sliding surface of the sliding plate is increased, the service life of the sliding plate is seriously influenced, and even steel penetrating accidents between the sliding plates are caused.
Chinese patent document CN207828342U (patent No. 201721701961.0) discloses a plum steel-tapping hole assembly brick, comprising: inner nozzle brick, steel-tapping hole assembly equipment is with seamless steel pipe, steel-tapping hole assembly end brick, steel-tapping hole assembly transition brick, steel-tapping hole assembly round hole steel-tapping hole brick, steel-tapping hole assembly plum blossom steel-tapping hole brick, retaining ring pipe for the grout material, steel-tapping hole assembly equipment is with apron, equipment seamless steel pipe cross, inner nozzle clamp plate, the utility model provides a plum blossom steel-tapping hole assembly brick is applicable to converter slide and keeps off sediment tapping device, relies on the plum blossom shape steel flowing hole, effectively prevents or alleviates the phenomenon that the molten steel produced the vortex and leads to the curling sediment in the flow process, has improved tapping speed and molten steel quality. The patent technology has the following defects: the patent utilizes the quincunx petals to change the vector of the rotation angle of molten steel fluid in a steel-tapping hole of the converter, only plays a role in inhibiting the scale and the quantity of eddy current generated by the molten steel fluid, has no active slag-stopping function, and can not be continuously effective because the quincunx gradually loses shape and loses efficacy along with the erosion of the steel-tapping hole.
Chinese patent document CN106041044B (patent number: 201610634268.X) discloses a continuous casting tundish permeable ceramic tube upper nozzle pocket block, which comprises an upper nozzle pocket block body, a ceramic tube, a gas chamber and a gas inlet tube, wherein the upper nozzle pocket block body is internally provided with the ceramic tube and an annular gas chamber which are uniformly arranged in a ring shape, the gas chamber is positioned at the bottom of the ceramic tube and communicated with the permeable ceramic tube, the upper part of the ceramic tube extends out of the upper surface of the nozzle pocket block body by 5-10 mm, the side part of the gas chamber is connected with the gas inlet tube, one end of the gas inlet tube is communicated with the gas chamber, the other end of the gas inlet tube extends out of the side part of the upper nozzle pocket block body, a metal tube is connected with an external argon gas source and is communicated with the metal tube after argon is blown in, an annular gas curtain barrier is formed upwards, molten steel entering an upper nozzle is subjected to gas washing to promote inclusion and removal, and a certain amount of argon bubbles enter the upper nozzle along with steel flow to form a stable floating upward gas curtain, The continuous annular airflow not only inhibits the nozzle nodulation problem, but also solves the problem of casting blank subcutaneous bubbles caused by protective argon bubbles entering steel. The patent technology has the following defects: the method is mainly used for solving the problem of the nodulation of a water gap of a tundish, in order to ensure that a certain amount of argon bubbles enter the water gap along with steel flow to form stable and continuous annular air flow, the arrangement position of a ceramic tube needs to be close to one side of the water gap, so that the argon blowing action range is small, the tundish is used for steel continuous casting, and only tiny impurities and small-particle steel slag exist in molten steel, so that the arrangement mode of the ceramic tube of the tundish is not suitable for the requirement of slag blocking of a steel tapping hole of a converter; in addition, the steel flowing hole of the upper nozzle pocket brick of the continuous casting tundish is small in diameter expansion, the molten steel flow is small, the ceramic pipe arranged in the middle of the upper nozzle pocket brick body cannot be corroded, but the steel tapping hole of the converter is large in diameter expansion, the molten steel flow is large, the ceramic pipe arranged in the middle of the converter steel tapping hole body can be corroded, the problem that the service lives of the ceramic pipe and the converter steel tapping hole body are not synchronous is caused, and the service life of the converter steel tapping hole is influenced.
Chinese patent document CN112593043A (202011499478.5) discloses a device for reducing the slag discharge amount in the steel tapping process of a steel-making converter, which comprises the converter, a converter steel tapping hole and an air source structure; the converter is characterized in that a furnace lining is arranged on the inner wall of the converter, the furnace lining adopts a magnesia brick permanent layer, and working layer bricks are built on the furnace lining; the steel-tapping hole is provided with a refractory material pipe with thickness, a plurality of uniformly distributed air inlet long holes are formed in the wall of the refractory material pipe, an annular air chamber is arranged at the bottom of the refractory material pipe, and the bottom ends of the air inlet long holes are communicated with the annular air chamber respectively. Although the proposal can effectively inhibit vortex slag entrapment in the tapping process and reduce the slag discharge amount in the tapping process of the steel converter, but the above patent mainly adjusts the flow of argon reasonably according to the size of the slag surface blown off in the converter, the slag covering the liquid level of the molten steel above the steel tapping hole is blown away by blowing in the argon with certain pressure to form a slag-free area so as to avoid vortex slag entrapment in the steel tapping process, therefore, in order to ensure the formation of effective high-pressure gas flow, the diameter of the air inlet long hole of the patent is 0.5-1.5 mm, although a slag-free area can be formed above the vortex, molten steel is easy to permeate into the air inlet long hole, so that the air flow is small, even the air is not ventilated, the problem that the air inlet long hole is blocked and jacked before the air inlet long hole appears due to the fact that the air blowing pressure needs to be increased, cracks are easily generated in the air inlet long hole, the refractory tube is cracked or even broken, the air blowing function is lost, and the service life of the steel outlet is influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a converter sliding steel-tapping hole and a whole-process steel-tapping slag-stopping method, wherein a breathable ceramic rod is eccentrically arranged in a steel-tapping hole brick body along the thickness direction of the steel-tapping hole brick body, after argon is blown in, an annular air curtain barrier is formed right ahead of the periphery of the steel-tapping hole by argon bubbles, so that the steel slag entering the steel-tapping hole along with steel flow is stopped, the circumferential speed of the steel flow above the steel-tapping hole, which causes the steel flow to be sucked into a vortex, is effectively reduced, the height of the generated sucked vortex is reduced, the key technical problem that the steel slag is mixed into the steel flow flowing out of the steel-tapping hole is solved, the defect that the sliding plate slag-stopping plate of the existing converter sliding steel-tapping hole cannot stop medium-term slag is overcome, the slag-controlling steel-tapping of the whole process of converter steel-tapping is realized, the slag-dropping amount of the converter is further reduced, and the corrosion of the steel slag to the inner walls of the steel-tapping hole, the inner water-tapping hole and the outer water-tapping hole steel-tapping hole is relieved, The service life of the tapping hole, the inner water gap and the outer water gap is prolonged by scouring.
The technical problem to be solved by the invention is realized by adopting the following technical scheme: a sliding steel-tapping hole of a converter is arranged in a steel-tapping hole mounting hole of the converter, one side close to the converter is taken as the inner end, a sliding plate slag-stopping device is arranged at the outer end of the steel-tapping hole mounting hole of the converter, and the sliding plate slag-stopping device comprises an inner water gap, a sliding plate and an outer water gap which are sequentially arranged from one side of the steel-tapping hole mounting hole of the converter to the outside; the converter sliding steel tapping hole comprises a steel tapping hole brick body, an air chamber box, a breathable ceramic rod, an air inlet pipe and a steel flowing hole;
the cylindrical steel flowing hole penetrates through the center of the steel tapping hole brick body along the axial direction of the steel tapping hole brick body, and the air-permeable ceramic rod, the air chamber box and the air inlet pipe are sequentially arranged inside the steel tapping hole brick body from the inner end to the outer end along the axial direction of the steel tapping hole brick body;
the cross section of the air chamber box is annular, the air chamber box and the steel flowing hole are coaxially arranged, the air-permeable ceramic rods are uniformly distributed in an annular shape along the circumferential direction of the air chamber box, the outer ends of the air-permeable ceramic rods are connected with the air chamber box, and the inner ends of the air-permeable ceramic rods extend out of the inner end face of the steel tapping hole brick body; the inner end of the air inlet pipe is connected with the outer end face of the air chamber box, the outer end of the air inlet pipe extends out of the side part of the outer end of the steel tapping hole brick body, and the air inlet pipe is used for being connected with an external argon source;
the center of the cross section of the air-permeable ceramic rod is positioned between the central line of the cross section of the steel-tapping hole brick body and the outer ring of the cross section of the steel-tapping hole brick body, and the distance m between the outer ring of the cross section of the air-permeable ceramic rod and the outer ring of the cross section of the steel-tapping hole brick body is 20-25 mm;
air holes are formed in the air-permeable ceramic rod along the axial direction of the air-permeable ceramic rod, the air holes longitudinally penetrate through the inner end face and the outer end face of the air-permeable ceramic rod, and the air holes are uniformly distributed on the cross section of the air-permeable ceramic rod.
Preferably, the number of the air-permeable ceramic rods is 6-9, the number of the air-permeable holes is 40-80, and the inner diameter of each air-permeable hole is 0.18-0.20 mm.
Preferably, the air-permeable ceramic rod is cylindrical, the outer diameter phi of the cylinder is 20-30 mm, and the length L of the air-permeable ceramic rod is 200-400 mm.
Preferably, the air chamber box is a metal box with a square longitudinal section, the side length a of the square is 30-40 mm, the metal box is formed by splicing two annular plates with L-shaped longitudinal sections, and the two annular plates are welded together;
the depth x of the air-permeable ceramic rod inserted into the air chamber box is 5-10 mm, and the length y of the air-permeable ceramic rod extending out of the inner end part of the steel tapping hole brick body is 5-10 mm.
Preferably, the outer end part of the steel tapping hole brick body is provided with a female hole, and the shape and the size of the female hole are matched with those of the sub-hole of the inner nozzle in a wedged manner.
Preferably, the steel-tapping hole brick body is formed by magnesium carbon isostatic pressing, and the volume density is more than or equal to 2.92g/cm 3 The normal temperature compression strength is more than or equal to 45.4Mpa, the normal temperature rupture strength is more than or equal to 22.9Mpa, the MgO content is more than or equal to 75 percent, and the C content is 18 to 19 percent.
Preferably, the air inlet pipe is a heat-resistant stainless steel round pipe, the outer diameter of the air inlet pipe is 12-16 mm, and the wall thickness of the air inlet pipe is 1.2-2.3 mm.
Preferably, the air-permeable ceramic rod is formed in the tap hole brick body by isostatic pressing of zirconium corundum.
The technical idea of the invention is as follows: according to the slag blocking principle, argon is blown into the air-permeable ceramic rods arranged along the axial direction of the steel-tapping hole brick body to form a large number of micro bubbles, so that an annular air curtain barrier is formed right in front of the steel-tapping hole, on one hand, steel slag entering the steel-tapping hole along with steel flow can be blocked, on the other hand, the circumferential speed of the steel flow sucking vortex caused above the steel-tapping hole can be effectively reduced, the height of the generated sucking vortex is reduced, the vortex is formed from the liquid level because the steel slag floats on the surface of the molten steel, the steel slag is distributed around the vortex, and after the height of the vortex is reduced, the lower end of the vortex is far away from the steel-tapping hole, so that the steel slag is effectively prevented from entering the steel-tapping hole.
In addition, because the vortex is formed on the surface of the molten steel, the cross section area of the vortex is increased from bottom to top, and the circumferential speed of the liquid surface of the outer ring of the vortex is in positive correlation with the formation of the vortex and the depth of the vortex, the center of the cross section of the air-permeable ceramic rod is arranged between the central line of the cross section of the steel-tapping hole brick body and the outer ring of the cross section of the steel-tapping hole brick body, the distance between the outer ring of the cross section of the air-permeable ceramic rod and the outer ring of the cross section of the steel-tapping hole brick body is limited to be 20-25 mm, the overall strength of the steel-tapping hole brick body is guaranteed to be qualified, and meanwhile, the circumferential speed of the liquid surface of the outer ring of the vortex can be effectively reduced by bubbles generated by the air-permeable ceramic rod, so that the optimal slag blocking effect is realized, the impact of the steel flow on the air-permeable ceramic rod can be reduced, and the service life of the steel-tapping hole is prolonged.
The air-permeable ceramic rods are eccentrically arranged in the steel-tapping hole brick body along the thickness direction of the steel-tapping hole brick body, the distance m between the outer wall of each air-permeable ceramic rod and the outer wall of the steel-tapping hole brick body is 20-25 mm, the number of the air-permeable ceramic rods is 6-9, the air-permeable ceramic rods are uniformly arranged in a circular ring shape, the outer diameter phi of each air-permeable ceramic rod is 20-30 mm, the length L of each air-permeable ceramic rod is 200-400 mm, and the like.
The invention unexpectedly discovers in a simulation research experiment that the permeable ceramic rods are arranged in the steel-tapping hole brick body, after air blowing, an annular air curtain barrier is formed right ahead of the periphery of the steel-tapping hole, so that the steel slag which is about to enter the steel-tapping hole along with the steel flow can be blocked, the circumferential speed of the steel flow which is caused above the steel-tapping hole and is sucked into the vortex can be effectively reduced, the height of the generated sucked vortex can be reduced, the steel slag can be effectively inhibited from entering the steel-tapping hole, the key technical problem that the steel slag is mixed into the steel flow which flows out of the steel-tapping hole can be solved, in addition, the technical scheme of eccentric arrangement outside the permeable ceramic rods can be found, the action range of argon blowing and slag blocking can be enlarged, the number and the outer diameter of the permeable ceramic rods and the flow of the blown argon have direct influence on the effect of air blowing and slag blocking, particularly, the number and the outer diameter of the permeable ceramic rods determine the size of the air-blowing amount, and the number of the permeable ceramic rods is increased, the larger the outer diameter, the larger the gas permeability, and the amount of argon gas blown directly affects the effect of blowing slag blocking. Meanwhile, the industrial application contrast test unexpectedly discovers that the technical scheme of the eccentric arrangement outside the air-permeable ceramic rod not only increases the action range of argon blowing and slag stopping and reduces the slag discharge amount at the steel outlet, but also avoids the problem that the permeable ceramic rod is damaged due to the diameter expansion of the steel flowing hole of the tap hole brick, realizes the synchronization of the service life of the permeable ceramic rod and the service life of the tap hole brick body, in addition, in the research, production and application tests of the sliding steel-tapping hole brick of the converter, the distance m between the outer wall of the air-permeable ceramic rod and the outer wall of the steel-tapping hole brick body is less than 20mm, the steel-tapping hole brick body is easy to generate surface cracks and influence the quality, and further influencing the service life of the tap hole brick, and through a large number of research experiments and application tests, the optimal distance m between the outer wall of the air-permeable ceramic rod and the outer wall of the tap hole brick body, the outer diameter phi of the air-permeable ceramic rod and control parameters for blowing argon into the air-permeable ceramic rod are determined through research.
In addition, the length L of the breathable ceramic rod is determined to be 200-400 mm according to the erosion length of the steel tapping hole, if the length L is too large, the development quality and the preparation cost of the breathable ceramic rod are influenced, and if the length L is too small, the argon blowing effect and the service life are influenced.
The sliding steel-tapping hole brick of the converter designed by the invention can tap steel, and has the following unexpected effects: the invention realizes slag control and steel tapping in the whole process of converter steel tapping through air blowing slag stopping and sliding plate slag stopping, further reduces the slag discharging amount of the converter, effectively inhibits the phenomenon of 'rotational flow' in the steel tapping hole, lightens the corrosion and scouring of steel slag on the inner walls of the steel tapping hole, the inner water gap and the outer water gap steel flowing hole, and prolongs the service life of the sliding steel tapping hole brick, the inner water gap and the sliding plate.
The invention also provides an installation method of the converter sliding steel tapping hole, wherein a flange plate is arranged at the outer end of the converter steel tapping hole installation hole, the flange plate is connected with an installation plate for installing the sliding plate slag stopping device, a base plate is arranged between the installation plate and the flange plate, and the installation plate is provided with a positioning groove for installing an inner water gap;
the installation method adopts a special positioning device, and the positioning device comprises a seamless steel pipe, a positioning plate and a positioning wedge;
the seamless steel pipe is sleeved in a steel flowing hole of the steel tapping hole brick body, a positioning plate is welded in the seamless steel pipe and provided with a bolt hole, the positioning plate is positioned on one side of the outer end of the seamless steel pipe, the positioning inclined iron is detachably arranged on the positioning plate, and the positioning inclined iron is used for being connected with the mounting plate;
the positioning wedge is provided with a sub-opening, and the shape and the size of the positioning wedge are the same as those of the sub-opening of the inner nozzle;
the specific installation steps are as follows:
1) combining and fixing a positioning plate on the steel tapping hole brick body and a positioning wedge by adopting a positioning bolt, a flat gasket and a fastening nut, then loading the steel tapping hole brick body into a steel tapping hole mounting hole formed by combining an outer brick cup of the steel tapping hole and an inner brick cup of the steel tapping hole by using a forklift, enabling the positioning wedge to correctly fall into a positioning groove for mounting an inner nozzle, and fixing the positioning wedge and the mounting plate by using an eyelet bolt by using a pneumatic tool;
2) an air inlet pipeline is arranged between the flange plate and the base plate and is communicated with the air inlet pipe in a butt joint mode, the air inlet pipeline is a heat-resistant stainless steel round pipe, the outer diameter of the air inlet pipeline is 12-16 mm, and the wall thickness of the air inlet pipeline is 1.2-2.3 mm; the seamless steel tube and the positioning plate are arranged, so that the accurate positioning is realized when the steel-tapping hole brick body is installed, and the accurate butt joint of the air inlet pipe and the air inlet pipeline is ensured; the seamless steel pipe and the positioning plate are melted when meeting high-temperature molten steel, and the flow of the molten steel in the steel tapping hole is not influenced;
3) the converter is shaken to the position where the steel flowing hole is vertically upward, a magnesia-calcia gunning mix is adopted to gunning gaps among the steel tapping hole brick body, the outer brick cup of the steel tapping hole and the inner brick cup of the steel tapping hole, baking and sintering are carried out for 25-35 minutes, a waterproof paste is arranged at the inner end part of the air-permeable ceramic rod, and the waterproof paste is used for protecting the air-permeable surface and preventing the problems of poor air permeability and the like caused by water seepage and material seepage;
4) shaking a converter steel tapping hole to the front of the converter, dismantling the positioning inclined iron, and installing an inner water gap of the sliding plate slag stopping device into the positioning groove;
5) after the sliding steel-tapping hole mechanism is provided with the sliding plate and the outer water hole, the sliding steel-tapping hole mechanism is transported and installed on the installation plate by using a forklift, the sliding steel-tapping hole mechanism and the installation plate are fixed together by using the eyelet bolt and the face pressure bolt, and finally the sliding steel-tapping hole is opened and closed and debugged, so that the installation of the sliding steel-tapping hole of the converter is completed, and the sliding steel-tapping hole mechanism is used for controlling the opening and closing of the sliding plate.
The magnesium-calcium gunning material is a conventional refractory material and is a commercially available product. The inner nozzle, the sliding plate and the outer nozzle are produced by the prior art.
The positioning bolt is M30X80 in model specification, the flat pad is phi 16 in model specification, and the fastening nut is M30 in model specification, and the positioning bolt is a commercially available product.
The invention also provides a whole-process steel tapping slag stopping method, the converter sliding steel tapping hole is adopted, and the air inlet of the air inlet pipe is connected with argon supply equipment, and the method comprises the following steps:
starting the converter to shake the converter and prepare for tapping, and simultaneously introducing argon, wherein the flow of the argon is controlled at 20-30 NL/min;
and (4) closing the sliding plate after the converter completely taps steel, and turning off argon while swinging the converter back to a normal smelting station.
The invention has the beneficial effects that:
1) the converter sliding steel-tapping hole is internally provided with the air-permeable ceramic rods in the steel-tapping hole brick body, the air-permeable ceramic rods are provided with the through micro air-permeable holes which are uniformly distributed along the axial direction, after argon is blown in, a large amount of micro argon bubbles can be formed, the argon bubbles form an annular air curtain barrier right in front of the periphery of the steel-tapping hole, thereby not only inhibiting the steel slag which is about to enter the steel-tapping hole along with the steel flow, but also effectively reducing the circumferential speed of the steel flow which is caused above the steel-tapping hole and sucked into a vortex, reducing the height of the generated sucked vortex, effectively inhibiting the steel slag from immersing into the steel-tapping hole, overcoming the key technical problem that the steel slag is mixed into the steel flow which flows out from the steel-tapping hole in the steel-tapping process, eliminating the defect that the sliding plate of the existing converter sliding steel-tapping hole cannot block the middle-term slag, realizing the slag control in the whole process of the converter steel-tapping through the air-blowing slag blocking and the sliding plate slag blocking, further reducing the slag discharging amount of the converter, the erosion and the scouring of the steel slag to the inner walls of the steel tapping hole, the inner water gap and the outer water gap steel flowing hole are reduced, and the service life is prolonged. Compared with the prior converter sliding steel tapping hole sliding plate slag-stopping steel tapping technology, the invention reduces the slag discharge of converter ton steel by more than 0.5kg at the same ratio, and improves the service lives of the converter steel tapping hole, the inner water gap and the sliding plate by more than 50 heats, 30 heats and 3 heats respectively at the same ratio.
2) The center line of the cross section of the air-permeable ceramic rod is arranged between the center line of the cross section of the steel-tapping hole brick body and the outer ring of the cross section of the steel-tapping hole brick body, and the distance between the outer ring of the cross section of the air-permeable ceramic rod and the outer ring of the cross section of the steel tapping hole brick body is limited to be 20-25 mm, the optimal slag-stopping effect is realized while the integral strength of the steel-tapping hole brick body is ensured to be qualified, the action range of argon blowing slag-stopping is enlarged, the slag-discharging amount of the steel-tapping hole is reduced, but also can reduce the impact of the steel stream on the air-permeable ceramic rod, avoid the problem that the air-permeable ceramic rod is damaged due to the diameter expansion of the steel stream hole of the tap hole brick, realize the synchronization of the service life of the air-permeable ceramic rod and the service life of the tap hole brick body, through application and test comparison with the technical scheme that the air-permeable ceramic rods are arranged at the center of the thickness of the steel-tapping hole brick body, the slag discharge amount of the steel per ton of the converter is reduced by more than 0.1kg on the same scale, and the service life of the steel-tapping hole of the converter is prolonged by more than 20 heats on the same scale.
3) According to the invention, the air-permeable ceramic rods, the air chamber box and the air inlet pipe are sequentially arranged inside the steel-tapping hole brick body from the inner end to the outer end along the axis direction of the steel-tapping hole brick body, wherein the air-permeable ceramic rods are provided with the air holes which are uniformly distributed along the axial direction, so that a large amount of micro bubbles can be formed, the molten steel can be effectively prevented from permeating, the air chamber box is arranged between the air-permeable ceramic rods and the air inlet pipe to serve as a transfer piece for gas exchange, the argon flow is uniformly distributed, the length of the air-permeable ceramic rods can be shortened, the preparation difficulty of a steel-tapping hole of a converter is reduced, the preparation cost is reduced, and the popularization and the application are more facilitated.
4) According to the installation method of the sliding steel-tapping hole of the converter, the special positioning device for installing the sliding steel-tapping hole brick is designed, so that the accurate positioning installation of the sliding steel-tapping hole brick and the accurate butt joint of the air inlet pipe and the air inlet pipeline are realized, and the further key technical problem in the industrial application of the invention is solved.
5) The air chamber box is formed by splicing two annular plates with L-shaped longitudinal sections, and the slots are formed in the annular plates, so that the air-permeable ceramic rods can be directly inserted into the slots, the preparation process of the air chamber box is simplified, the preparation time is shortened, and the preparation quality is improved.
6) According to the invention, the inner end of the air-permeable ceramic rod extends out of the end surface of the inner end of the tap hole brick body, so that the position of the air-permeable ceramic rod can be fixed from the outside of the tap hole brick body, the outer end of the air-permeable ceramic rod is fixedly arranged in the slot on the air chamber box, and the air-permeable ceramic rod is formed in the tap hole brick body in an isostatic pressing manner, so that the problem of difficult positioning of the air-permeable ceramic rod is solved.
Drawings
FIG. 1 is a schematic sectional view of a structure of a sliding tap hole of a converter according to an embodiment of the present invention;
FIG. 2 is a sectional view A-A of a structure of a sliding tap hole of a converter in an embodiment of the present invention;
FIG. 3 is a schematic view of a structure of a gas cell case according to an embodiment of the present invention;
FIG. 4 is a schematic view of the assembly of the sliding tap hole of the converter and the positioning wedge in the embodiment of the present invention;
FIG. 5 is a schematic view showing the installation of a sliding tap hole of a converter according to an embodiment of the present invention;
in the drawing, 1 a tap hole brick body; 2, an air chamber box; 3, a breathable ceramic rod; 4, air inlet pipe; 5, seamless steel pipes; 6 bolt holes; 7, positioning a plate; 8, waterproof sticking; 9 slot; 10 swing bolts; 11 positioning the inclined iron; 12 positioning the bolt; 13 flat gasket; 14 fastening the nut; 15 flange plates; 16 a substrate; 17, mounting a plate; 18 sliding tap hole mechanism; 19 inner nozzle; 20, sliding plates; 21 outer nozzle; 22 an inlet line; 23, brick cup outside the steel tapping hole; 24, setting bricks in the steel tapping hole; 25, a magnesium-calcium gunning material.
Detailed Description
The invention is further illustrated by the following examples and drawings, but is not limited thereto.
In the embodiment, the magnesium-calcium gunning mix 25, the seamless steel pipe 5, the positioning bolt 12, the flat gasket 13, the fastening nut 14 and the air inlet pipeline 22 are all conventional materials and are commercially available products.
Example 1
A sliding steel-tapping hole of a converter is shown in figure 5, one side close to the converter is taken as an inner end, a sliding plate slag-stopping device is arranged at the outer end of a mounting hole of the steel-tapping hole of the converter, and the sliding plate slag-stopping device comprises an inner water gap 19, a sliding plate 20 and an outer water gap 21 which are sequentially arranged from one side of the mounting hole of the steel-tapping hole of the converter to the outside. As shown in fig. 1, 2 and 3, the sliding tap hole of the converter comprises a tap hole brick body 1, a plenum box 2, an air-permeable ceramic rod 3, an air inlet pipe 4 and a tap hole.
The steel-tapping hole brick body 1 is formed by magnesium carbon isostatic pressing, and the volume density is more than or equal to 2.92g/cm 3 The normal temperature compression strength is more than or equal to 45.4Mpa, the normal temperature rupture strength is more than or equal to 22.9Mpa, the MgO content is more than or equal to 75 percent, and the C content is 18 to 19 percent. The outer end part of the steel tapping hole brick body 1 is provided with a female hole, and the shape and the size of the female hole are matched with the shape and the size of a sub-hole of the inner nozzle 19 in a wedged manner.
Steel-tapping hole brick body 1 is cylindrical, and the axial of columniform steel flowing hole along steel-tapping hole brick body 1 runs through the setting and puts at steel-tapping hole brick body 1 central point, ventilative ceramic stick 3, air chamber box 2 and intake pipe 4 set gradually in steel-tapping hole brick body 1's inside by inner outside end along 1 axis direction of steel-tapping hole brick body.
The cross section of the air chamber box 2 is annular, the air chamber box 2 and the cast iron hole are coaxially arranged, the number of the air-permeable ceramic rods 3 is 6, the air-permeable ceramic rods 3 are uniformly distributed in an annular shape along the circumferential direction of the air chamber box 2, the outer ends of the air-permeable ceramic rods 3 are connected with the air chamber box 2, and the inner ends of the air-permeable ceramic rods 3 extend out of the inner end surface of the steel tapping hole brick body 1; specifically, the upper part of the air chamber box 2 is provided with a slot 9, the air-permeable ceramic rods 3 are inserted into the slot 9, and the shape, size and number of the slot 9 are adapted to the shape, size and number of the ceramic rods 3 inserted into the slot 9. The air chamber box 2 is a metal box with a square longitudinal section, the side length a of the square is 40mm, the metal box is formed by splicing two annular plates with L-shaped longitudinal sections, and one of the annular plates is provided with a slot 9.
The depth x of the air-permeable ceramic rod 3 inserted into the air chamber box 2 is 5mm, the length y of the end part of the air-permeable ceramic rod 3 extending out of the steel tapping hole brick body 1 is 10mm, and a waterproof sticker 8 is arranged on the end face of the inner end of the air-permeable ceramic rod 3.
The center of the cross section of the air-permeable ceramic rod 3 is positioned between the central line of the cross section of the steel-tapping hole brick body 1 and the outer ring of the cross section of the steel-tapping hole brick body 1, and the distance m between the outer ring of the cross section of the air-permeable ceramic rod 3 and the outer ring of the cross section of the steel-tapping hole brick body 1 is 20 mm.
The air-permeable ceramic rod 3 is formed in the tap hole brick body 1 through isostatic pressing of zirconia-corundum, the air-permeable ceramic rod 3 is cylindrical, the outer diameter phi of the cylinder is 30mm, and the length L of the air-permeable ceramic rod 3 is 400 mm.
Air holes are formed in the air-permeable ceramic rod 3 along the axial direction of the air-permeable ceramic rod 3, the air holes longitudinally penetrate through the inner end face and the outer end face of the air-permeable ceramic rod 3, and the air holes are uniformly distributed on the cross section of the air-permeable ceramic rod 3.
The diameter of bleeder vent is 0.18mm, and the bleeder vent is 3 concentric ring shape evenly distributed, radially from inside to outside along ventilative ceramic rod 3, and the bleeder vent quantity of 1 st ring is 9, and the bleeder vent quantity of 2 nd ring is 18, and the bleeder vent quantity of 3 rd ring is 27.
The inner of intake pipe 4 is connected with the outer terminal surface of air chamber box 2, and the outer end of intake pipe 4 stretches out from the outer end lateral part of tapping hole brick body 1, intake pipe 4 is used for connecting outside argon gas source, the material of intake pipe 4 is heat-resisting stainless steel pipe, and the external diameter is 16mm, and the wall thickness is 2.3 mm.
As shown in fig. 4 and 5, in the method for installing the sliding steel-tapping hole of the converter, a flange plate 15 is arranged at the outer end of the installation hole of the steel-tapping hole of the converter, an installation plate 17 for installing the sliding plate slag stopper is connected to the flange plate 15, a base plate 16 is arranged between the installation plate 17 and the flange plate 15, and the installation plate 17 is provided with a positioning groove for installing an inner water gap 19.
The installation method adopts a special positioning device, and the positioning device comprises a seamless steel tube 5, a positioning plate 7 and a positioning wedge 11.
The seamless steel tube 5 is sleeved in a steel flowing hole of the steel tapping hole brick body 1, a positioning plate 7 is arranged in the seamless steel tube 5 in a welding mode, the positioning plate 7 is provided with a bolt hole 6, the positioning plate 7 is located on one side of the outer end of the seamless steel tube 5, the positioning inclined iron 11 is detachably arranged on the positioning plate 7, and the positioning inclined iron 11 is used for being connected with the mounting plate 17.
The positioning wedge 11 is provided with a sub-opening, and the shape and the size of the sub-opening are the same as those of the sub-opening of the inner nozzle 19.
The specific installation steps are as follows:
1) after the positioning plate 7 on the tap hole brick body 1 and the positioning wedge 11 are combined and fixed by adopting the positioning bolt 12, the flat gasket 13 and the fastening nut 14, the tap hole brick body 1 is loaded into a tap hole mounting hole formed by combining the tap hole outer brick cup 23 and the tap hole inner brick cup 24 by using a forklift, so that the positioning wedge 11 correctly falls into a positioning groove for mounting the inner nozzle 19, and the movable joint bolt 10 is used for fixing the positioning wedge 11 and the mounting plate 17 by using a pneumatic tool.
2) An air inlet pipeline 22 is arranged between the flange plate 15 and the base plate 16, and the air inlet pipeline 22 is in butt joint communication with the air inlet pipe 4.
The gas inlet pipe 4 is communicated with an external argon gas source through a gas inlet pipeline 22.
The air inlet pipeline 22 is made of a heat-resistant stainless steel round pipe, the outer diameter of the air inlet pipeline is 16mm, and the wall thickness of the air inlet pipeline is 2.3 mm.
3) And (3) shaking the converter to the position where the tap hole is vertically upward, gunning the gap between the tap hole brick body 1 and the tap hole outer brick cup 23 and the tap hole inner brick cup 24 by adopting a magnesia-calcia gunning material 25, and then baking and sintering for 35 minutes.
4) And (3) shaking the steel tapping hole of the converter to the front of the converter, dismantling the positioning inclined iron 11, and installing an inner water gap 19 of the sliding plate slag stopping device into the positioning groove.
5) After the sliding steel-tapping hole mechanism 18 is provided with the sliding plate 20 and the outer nozzle 21, the sliding steel-tapping hole mechanism 18 is transported and installed on the installation plate 17 by using a forklift, the sliding steel-tapping hole mechanism 18 and the installation plate 17 are fixed together by using the swing bolt and the face pressure bolt, and finally, the sliding steel-tapping hole is opened and closed and adjusted, so that the installation of the sliding steel-tapping hole of the converter is completed, wherein the sliding steel-tapping hole mechanism 18 is used for controlling the opening and closing of the sliding plate 20.
The invention relates to a method for carrying out tapping and slag stopping in the whole process by utilizing a sliding tapping hole of a converter, wherein an air inlet of an air inlet pipe 4 is connected with argon supply equipment, and the method comprises the following steps:
and (4) starting to shake the converter and prepare for tapping, and simultaneously introducing argon, wherein the flow rate of the argon is controlled at 30 NL/min.
And (5) closing the sliding plate 20 after tapping of the converter is completed, and turning off argon while swinging the converter back to a normal smelting station.
Example 2
The difference from the sliding tap hole of the converter described in example 1 is that:
the distance m between the outer wall of the air-permeable ceramic rod 3 and the outer wall of the steel tapping hole brick body 1 is 25 mm.
The outer diameter phi of the air-permeable ceramic rod 3 is 20mm, and the length L of the air-permeable ceramic rod 3 is 200 mm.
The side length a of the square section of the air chamber box 2 is 30mm, the depth x of the air-permeable ceramic rod 3 inserted into the air chamber box 2 is 10mm, and the length y extending out of the inner end part of the steel tapping hole brick body 1 is 5 mm.
The diameter that sets up the bleeder vent in the ventilative ceramic stick 3 is 0.2mm, and the bleeder vent is 3 concentric ring shape evenly distributed, radially from inside to outside along ventilative ceramic stick 3, and the bleeder vent quantity of 1 st ring is 6, and the bleeder vent quantity of 2 nd ring is 12, and the bleeder vent quantity of 3 rd ring is 18.
The number of the air-permeable ceramic rods 3 is 9.
The outer diameters of the air inlet pipe 4 and the air inlet pipeline 22 are both 12mm, and the wall thickness is both 1.2 mm.
The invention relates to a method for carrying out tapping and slag stopping in the whole process by utilizing a converter sliding tapping hole, which comprises the following steps:
and when the converter starts to shake the converter and prepares for tapping, argon is introduced, the flow of the argon is controlled at 20NL/min, and the argon is closed when the converter finishes tapping and shakes back to a normal smelting station.
Example 3
The difference from the sliding tap hole of the converter described in example 1 is that:
the distance m between the outer wall of the air-permeable ceramic rod 3 and the outer wall of the steel tapping hole brick body 1 is 22 mm.
The outer diameter phi of the air-permeable ceramic rod 3 is 22mm, and the length L of the air-permeable ceramic rod 3 is 300 mm.
The side length a of the square section of the air chamber box 2 is 35mm, the depth x of the air-permeable ceramic rod 3 inserted into the air chamber box 2 is 7mm, and the length y extending out of the inner end part of the steel-tapping hole brick body 1 is 7 mm.
The diameter that sets up the bleeder vent in the ventilative ceramic stick 3 is 0.19mm, and the bleeder vent is 3 concentric ring shape evenly distributed, radially from inside to outside along ventilative ceramic stick 3, and the bleeder vent quantity of 1 st ring is 8, and the bleeder vent quantity of 2 nd ring is 16, and the bleeder vent quantity of 3 rd ring is 24.
The number of the air-permeable ceramic rods 3 is 9.
The outer diameters of the air inlet pipe 4 and the air inlet pipeline 22 are both 14mm, and the wall thickness is both 2.3 mm.
According to the installation method of the sliding steel tapping hole of the converter, the flange plate 15 is arranged at the outer end of the installation hole of the steel tapping hole of the converter, the flange plate 15 is connected with the installation plate 17 for installing the sliding plate slag stopping device, the base plate 16 is arranged between the installation plate 17 and the flange plate 15, and the installation plate 17 is provided with the positioning groove for installing the inner water gap 19.
The installation method adopts a special positioning device, and the positioning device comprises a seamless steel tube 5, a positioning plate 7 and a positioning wedge 11.
The seamless steel tube 5 is sleeved in a steel flowing hole of the steel tapping hole brick body 1, a positioning plate 7 is arranged in the seamless steel tube 5 in a welding mode, the positioning plate 7 is provided with a bolt hole 6, the positioning plate 7 is located on one side of the outer end of the seamless steel tube 5, the positioning inclined iron 11 is detachably arranged on the positioning plate 7, and the positioning inclined iron 11 is used for being connected with the mounting plate 17.
The positioning wedge 11 is provided with a sub-opening, and the shape and the size of the sub-opening are the same as those of the sub-opening of the inner water gap 19.
The specific installation steps are as follows:
1) after the positioning plate 7 on the tap hole brick body 1 and the positioning wedge 11 are combined and fixed by adopting the positioning bolt 12, the flat gasket 13 and the fastening nut 14, the tap hole brick body 1 is loaded into a tap hole mounting hole formed by combining the tap hole outer brick cup 23 and the tap hole inner brick cup 24 by using a forklift, so that the positioning wedge 11 correctly falls into a positioning groove for mounting the inner nozzle 19, and the movable joint bolt 10 is used for fixing the positioning wedge 11 and the mounting plate 17 by using a pneumatic tool.
2) An air inlet pipeline 22 is arranged between the flange plate 15 and the base plate 16, and the air inlet pipeline 22 is in butt joint communication with the air inlet pipe 4.
3) And (3) shaking the converter to the position where the tap hole is vertically upward, gunning the gap between the tap hole brick body 1 and the outer brick cup 23 and the inner brick cup 24 of the tap hole by adopting a magnesia-calcia gunning material 25, and then baking and sintering for 30 minutes.
4) And (3) shaking the steel tapping hole of the converter to the front of the converter, dismantling the positioning inclined iron 11, and installing an inner water gap 19 of the sliding plate slag stopping device into the positioning groove.
5) After the sliding steel-tapping hole mechanism 18 is provided with the sliding plate 20 and the outer nozzle 21, the sliding steel-tapping hole mechanism 18 is transported and installed on the installation plate 17 by using a forklift, the sliding steel-tapping hole mechanism 18 and the installation plate 17 are fixed together by using the swing bolt and the face pressure bolt, and finally, the sliding steel-tapping hole is opened and closed and adjusted, so that the installation of the sliding steel-tapping hole of the converter is completed, wherein the sliding steel-tapping hole mechanism 18 is used for controlling the opening and closing of the sliding plate 20.
The invention relates to a method for carrying out tapping and slag stopping in the whole process by utilizing a converter sliding tapping hole, which comprises the following steps:
and when the converter starts to shake the converter and prepares for tapping, argon is turned on, the flow rate of the argon is controlled to be 25NL/min, when the converter starts to shake the converter and prepares for tapping, argon is turned on, the flow rate of the argon is controlled to be 30NL/min, and when the converter taps completely, the sliding plate 20 is closed, and the converter is shaken back to a normal smelting station, the argon is closed.
Comparative example 1
Chinese patent document CN207828342U (patent number: 201721701961.0) discloses a plum steel-tapping hole assembly brick, the width of a sub-hole of an inner water gap is 45mm, an upper sliding plate is embedded with a zirconium ring, a lower sliding plate is embedded with a zirconium plate, and a sliding steel-tapping hole sliding plate is adopted to block slag and tap steel.
Comparative example 2
In the embodiment 1 of the invention, the center of the cross section of the air-permeable ceramic rod 3 is positioned between the center line of the cross section of the tap-hole brick body 1 and the outer ring of the cross section of the tap-hole brick body 1, and the center of the cross section of the air-permeable ceramic rod 3 is superposed with the center line of the cross section of the tap-hole brick body 1, and the rest parts are the same.
The application tests and the comparative tests of the examples 1 to 3, the comparative examples 1 and the comparative examples 2 are carried out on the sliding steel tapping hole of the 120t converter in the steel plant of the Yingshan type Steel, Inc. of the Laiwu Steel group, and the results are shown in the table 1, the blowing effect of the steel tapping hole of the converter is obvious, the average steel slag amount of the converter applying the steel tapping hole is less than 2.35kg, the steel slag amount is reduced by more than 0.5kg compared with the comparative example 1, the service lives of the steel tapping hole, the inner water gap and the sliding plate of the converter are respectively improved by more than 50 heats, 30 heats and 3 heats compared with the comparative example 1, and meanwhile, the steel penetration accident caused by slag inclusion of the sliding plate is avoided.
The center of the cross section of the air-permeable ceramic rod 3 is arranged between the center line of the cross section of the steel-tapping hole brick body 1 and the outer ring of the cross section of the steel-tapping hole brick body 1, the arrangement of an external eccentric process is more reasonable, the air blowing and slag stopping effect is better than that of a comparative example 2, the average steel slag amount of a converter is reduced by more than 0.1kg on the same scale compared with that of the comparative example 2, and the service lives of a steel-tapping hole, an inner water gap and a sliding plate of the converter are improved by more than 20 heats, 5 heats and 1 heat on the same scale. The comparative results are shown in Table 1.
TABLE 1
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A sliding steel tapping hole of a converter is arranged in a steel tapping hole mounting hole of the converter, one side close to the converter is taken as an inner end, a sliding plate slag blocking device is arranged at the outer end of the steel tapping hole mounting hole of the converter, and the sliding plate slag blocking device comprises an inner water gap (19), a sliding plate (20) and an outer water gap (21) which are sequentially arranged from one side of the steel tapping hole mounting hole of the converter to the outside; the method is characterized in that: the converter sliding steel tapping hole comprises a steel tapping hole brick body (1), an air chamber box (2), a breathable ceramic rod (3), an air inlet pipe (4) and a steel flowing hole;
the cylindrical steel flowing hole penetrates through the center of the steel tapping hole brick body (1) along the axial direction of the steel tapping hole brick body (1), and the air-permeable ceramic rod (3), the air chamber box (2) and the air inlet pipe (4) are sequentially arranged inside the steel tapping hole brick body (1) from the inner end to the outer end along the axial direction of the steel tapping hole brick body (1);
the cross section of the air chamber box (2) is annular, the air chamber box (2) and the cast iron hole are coaxially arranged, the air-permeable ceramic rods (3) are uniformly distributed in an annular shape along the circumferential direction of the air chamber box (2), the outer ends of the air-permeable ceramic rods (3) are connected with the air chamber box (2), and the inner ends of the air-permeable ceramic rods (3) extend out of the inner end face of the steel tapping hole brick body (1) to be arranged; the inner end of the air inlet pipe (4) is connected with the outer end face of the air chamber box (2), the outer end of the air inlet pipe (4) extends out of the side part of the outer end of the steel-tapping hole brick body (1), and the air inlet pipe (4) is used for being connected with an external argon source;
the center of the cross section of the air-permeable ceramic rod (3) is positioned between the center line of the cross section of the steel-tapping hole brick body (1) and the outer ring of the cross section of the steel-tapping hole brick body (1), and the distance m between the outer ring of the cross section of the air-permeable ceramic rod (3) and the outer ring of the cross section of the steel-tapping hole brick body (1) is 20-25 mm;
air holes are formed in the air-permeable ceramic rod (3) along the axial direction of the air-permeable ceramic rod (3), the air holes longitudinally penetrate through the inner end face and the outer end face of the air-permeable ceramic rod (3), and the air holes are uniformly distributed on the cross section of the air-permeable ceramic rod (3).
2. The sliding tap hole of the converter according to claim 1, characterized in that: the number of the air-permeable ceramic rods (3) is 6-9, the number of the air-permeable holes is 40-80, and the inner diameter of each air-permeable hole is 0.18-0.20 mm.
3. The sliding tap hole of the converter according to claim 1 or 2, characterized in that: ventilative ceramic stick (3) are cylindrical, and cylinder external diameter phi is 20 ~ 30mm, the length L of ventilative ceramic stick (3) is 200 ~ 400 mm.
4. The converter sliding tap hole according to claim 1 or 2, characterized in that: the air chamber box (2) is a metal box with a square longitudinal section, the side length a of the square is 30-40 mm, and the metal box is formed by splicing two annular plates with L-shaped longitudinal sections;
the depth x of the air-permeable ceramic rod (3) inserted into the air chamber box (2) is 5-10 mm, and the length y of the air-permeable ceramic rod (3) extending out of the inner end part of the tap hole brick body (1) is 5-10 mm.
5. The sliding tap hole of the converter according to claim 1 or 2, characterized in that: the outer end part of the steel tapping hole brick body (1) is provided with a female hole, and the shape and the size of the female hole are wedged with the shape and the size of a secondary hole of the inner nozzle (19).
6. The sliding tap hole of the converter according to claim 1 or 2, characterized in that: the steel-tapping hole brick body (1) is formed by magnesium carbon isostatic pressing, and the volume density is more than or equal to 2.92g/cm 3 The normal temperature compression strength is more than or equal to 45.4Mpa, the normal temperature rupture strength is more than or equal to 22.9Mpa, the MgO content is more than or equal to 75 percent, and the C content is 18 to 19 percent.
7. The sliding tap hole of the converter according to claim 1 or 2, characterized in that: the air inlet pipe (4) is a heat-resistant stainless steel round pipe, the outer diameter of the air inlet pipe is 12-16 mm, and the wall thickness of the air inlet pipe is 1.2-2.3 mm.
8. The sliding tap hole of the converter according to claim 1 or 2, characterized in that: the air-permeable ceramic rod (3) is formed in the tap hole brick body (1) by isostatic pressing of zirconium corundum.
9. A method for installing a sliding tap hole of a converter according to any one of claims 1 to 8, wherein: a flange plate (15) is arranged at the outer end of the mounting hole of the steel tapping hole of the converter, the flange plate (15) is connected with a mounting plate (17) for mounting the sliding plate slag stopping device, a base plate (16) is arranged between the mounting plate (17) and the flange plate (15), and the mounting plate (17) is provided with a positioning groove for mounting an inner water gap (19);
the installation method adopts a special positioning device, and the positioning device comprises a seamless steel pipe (5), a positioning plate (7) and a positioning inclined iron (11);
the seamless steel tube (5) is sleeved in a steel flowing hole of the steel tapping hole brick body (1), a positioning plate (7) is arranged in the seamless steel tube (5) in a welding mode, a bolt hole (6) is formed in the positioning plate (7), the positioning plate (7) is located on one side of the outer end of the seamless steel tube (5), the positioning inclined iron (11) is detachably arranged on the positioning plate (7), and the positioning inclined iron (11) is used for being connected with the mounting plate (17);
the positioning wedge (11) is provided with a sub-opening, and the shape and the size of the sub-opening are the same as those of the sub-opening of the inner nozzle (19);
the specific installation steps are as follows:
1) combining and fixing a positioning plate (7) on a tap hole brick body (1) and a positioning wedge (11) by adopting a positioning bolt (12), a flat gasket (13) and a fastening nut (14), then loading the tap hole brick body (1) into a tap hole mounting hole formed by combining a tap hole outer brick cup (23) and a tap hole inner brick cup (24) by using a forklift, enabling the positioning wedge (11) to correctly fall into a positioning groove for mounting an inner nozzle (19), and fixing the positioning wedge (11) and a mounting plate (17) by using a movable joint bolt (10) by using a pneumatic tool;
2) an air inlet pipeline (22) is arranged between the flange plate (15) and the base plate (16), the air inlet pipeline (22) is a heat-resistant stainless steel round pipe, the outer diameter of the air inlet pipeline is 12-16 mm, the wall thickness of the air inlet pipeline is 1.2-2.3 mm, and the air inlet pipeline (22) is in butt joint communication with the air inlet pipe (4);
3) the converter is shaken to the position where the steel flowing hole (100) is vertically upward, a magnesia-calcia gunning material (25) is adopted to gunning the gap between the steel tapping hole brick body (1) and the steel tapping hole outer brick cup (23) and the steel tapping hole inner brick cup (24), and then baking and sintering are carried out for 25-35 minutes;
4) shaking the steel tapping hole of the converter to the front of the converter, dismantling the positioning inclined iron (11), and installing an inner water gap (19) of the sliding plate slag stopping device into the positioning groove;
5) after a sliding plate (20) and an outer water gap (21) are arranged on a sliding steel-tapping hole mechanism (18), the sliding steel-tapping hole mechanism (18) is transported and arranged on an installation plate (17) by a forklift, the sliding steel-tapping hole mechanism (18) and the installation plate (17) are fixed together by using swing bolts and surface pressure bolts, and finally the sliding steel-tapping hole is opened and closed and adjusted, so that the installation of the sliding steel-tapping hole of the converter is completed, wherein the sliding steel-tapping hole mechanism (18) is used for controlling the opening and closing of the sliding plate (20).
10. A whole-process tapping slag stopping method for a sliding tapping hole of a converter according to any one of claims 1 to 8, which is characterized by comprising the following steps of:
starting the converter to shake the converter and prepare for tapping, and simultaneously introducing argon, wherein the flow of the argon is controlled at 20-30 NL/min;
and (3) closing the sliding plate (20) after the converter completely taps steel, and turning off argon while swinging the converter back to a normal smelting station.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210686939.2A CN114891949B (en) | 2022-06-16 | 2022-06-16 | Sliding tapping hole of converter and whole-course tapping slag blocking method |
| PCT/CN2023/091241 WO2023241241A1 (en) | 2022-06-16 | 2023-04-27 | Converter sliding taphole and whole-process steel-tapping slag-blocking method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210686939.2A CN114891949B (en) | 2022-06-16 | 2022-06-16 | Sliding tapping hole of converter and whole-course tapping slag blocking method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114891949A true CN114891949A (en) | 2022-08-12 |
| CN114891949B CN114891949B (en) | 2023-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210686939.2A Active CN114891949B (en) | 2022-06-16 | 2022-06-16 | Sliding tapping hole of converter and whole-course tapping slag blocking method |
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| Country | Link |
|---|---|
| CN (1) | CN114891949B (en) |
| WO (1) | WO2023241241A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023241241A1 (en) * | 2022-06-16 | 2023-12-21 | 山东钢铁股份有限公司 | Converter sliding taphole and whole-process steel-tapping slag-blocking method |
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| AT504079A1 (en) * | 2006-09-13 | 2008-03-15 | Voest Alpine Ind Anlagen | METHOD FOR EXTRACTING MELT FROM A TILTABLE METALLURGICAL VESSEL AND APPARATUS FOR CARRYING OUT THE METHOD |
| CN108265149A (en) * | 2018-04-09 | 2018-07-10 | 东北大学 | A kind of method of ring converter taphole air blowing control converter tapping slag |
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| CN212610759U (en) * | 2020-07-20 | 2021-02-26 | 马鞍山利尔开元新材料有限公司 | Converter slide blows argon tapping gate valve equipment |
| CN112593043A (en) * | 2020-12-17 | 2021-04-02 | 本钢板材股份有限公司 | Device and method for reducing slag discharge amount in steel tapping process of steel converter |
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| JP2009174012A (en) * | 2008-01-25 | 2009-08-06 | Jfe Steel Corp | Molten steel-tapping hole blocking brick in converter and molten steel-tapping hole brick structure |
| CN104028739B (en) * | 2014-06-18 | 2016-09-21 | 莱芜钢铁集团有限公司 | A kind of ladle ventilating filling pipe end brick cup and the method controlling mouth of a river slag thereof |
| CN106041044B (en) * | 2016-08-04 | 2018-09-07 | 山东钢铁股份有限公司 | A kind of continuous casting production permeable-gas ceramics pipe filling pipe end brick cup and its ar blowing refining method |
| CN114891949B (en) * | 2022-06-16 | 2023-10-24 | 山东钢铁股份有限公司 | Sliding tapping hole of converter and whole-course tapping slag blocking method |
-
2022
- 2022-06-16 CN CN202210686939.2A patent/CN114891949B/en active Active
-
2023
- 2023-04-27 WO PCT/CN2023/091241 patent/WO2023241241A1/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT504079A1 (en) * | 2006-09-13 | 2008-03-15 | Voest Alpine Ind Anlagen | METHOD FOR EXTRACTING MELT FROM A TILTABLE METALLURGICAL VESSEL AND APPARATUS FOR CARRYING OUT THE METHOD |
| CN108265149A (en) * | 2018-04-09 | 2018-07-10 | 东北大学 | A kind of method of ring converter taphole air blowing control converter tapping slag |
| CN212610759U (en) * | 2020-07-20 | 2021-02-26 | 马鞍山利尔开元新材料有限公司 | Converter slide blows argon tapping gate valve equipment |
| CN111774560A (en) * | 2020-07-25 | 2020-10-16 | 莱芜钢铁集团银山型钢有限公司 | LF refining ladle microporous ceramic rod breathable upper nozzle pocket brick and argon blowing control method thereof |
| CN112593043A (en) * | 2020-12-17 | 2021-04-02 | 本钢板材股份有限公司 | Device and method for reducing slag discharge amount in steel tapping process of steel converter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023241241A1 (en) * | 2022-06-16 | 2023-12-21 | 山东钢铁股份有限公司 | Converter sliding taphole and whole-process steel-tapping slag-blocking method |
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| Publication number | Publication date |
|---|---|
| CN114891949B (en) | 2023-10-24 |
| WO2023241241A1 (en) | 2023-12-21 |
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