CN114891949B - Sliding tapping hole of converter and whole-course tapping slag blocking method - Google Patents
Sliding tapping hole of converter and whole-course tapping slag blocking method Download PDFInfo
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- CN114891949B CN114891949B CN202210686939.2A CN202210686939A CN114891949B CN 114891949 B CN114891949 B CN 114891949B CN 202210686939 A CN202210686939 A CN 202210686939A CN 114891949 B CN114891949 B CN 114891949B
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- tapping
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- 238000010079 rubber tapping Methods 0.000 title claims abstract description 260
- 239000002893 slag Substances 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000000903 blocking effect Effects 0.000 title claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 191
- 239000010959 steel Substances 0.000 claims abstract description 191
- 239000011449 brick Substances 0.000 claims abstract description 137
- 239000000919 ceramic Substances 0.000 claims abstract description 124
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 92
- 229910052786 argon Inorganic materials 0.000 claims abstract description 46
- 239000007789 gas Substances 0.000 claims abstract description 9
- 238000009423 ventilation Methods 0.000 claims description 48
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 44
- 238000009434 installation Methods 0.000 claims description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- 229910052742 iron Inorganic materials 0.000 claims description 19
- 230000007246 mechanism Effects 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 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
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 4
- 238000004891 communication Methods 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
- 238000005056 compaction Methods 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 239000010431 corundum Substances 0.000 claims description 3
- 238000000462 isostatic pressing Methods 0.000 claims description 3
- 230000002829 reductive effect Effects 0.000 abstract description 26
- 230000008569 process Effects 0.000 abstract description 13
- 230000004888 barrier function Effects 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 4
- 238000007664 blowing Methods 0.000 description 16
- 238000007599 discharging Methods 0.000 description 8
- 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
- 230000000694 effects Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000009991 scouring Methods 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical group [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000011161 development Methods 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
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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 utility model relates to a sliding steel-tapping hole of a converter and a whole-course steel-tapping slag blocking method, wherein the center of the cross section of a gas-permeable ceramic rod is arranged between the center line of the cross section of a 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 gas-permeable ceramic rod and the outer ring of the cross section of the steel-tapping hole brick body is 20-25 mm, after argon is blown in, argon bubbles form an annular gas curtain barrier right in front of the periphery of the steel-tapping hole, so that steel slag entering the steel-tapping hole along with steel flow is blocked, the height of a vortex sucked above the steel-tapping hole is effectively reduced, the key technical problem that steel slag is mixed in the steel flow flowing out of the steel-tapping hole in the steel-tapping process is solved, the defect that the sliding steel-tapping hole of the existing converter cannot block middle-stage slag is eliminated.
Description
Technical Field
The utility model relates to a sliding steel tapping hole of a converter and a whole-course steel tapping slag blocking method, and belongs to the technical field of ferrous metallurgy steelmaking.
Background
In order to optimize the 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-sucking method, a siphon tapping method and the like are invented successively, but the slag-stopping success rate is low, the effect is not ideal, the converter sliding tapping hole slag-controlling tapping technology developed in recent years at home has high slag-stopping success rate and good slag-stopping effect, and is widely applied, but the following problems or defects exist in the production and application: (1) The sliding steel tapping hole of the converter adopts a sliding plate to stop slag, only 30% of early slag and 40% of later slag can be blocked, 30% of middle slag in the tapping process can not be blocked, the middle slag is mainly steel slag which is involved in molten steel and enters the steel tapping hole in the tapping process, and the existing steel tapping slag stopping technology can not effectively block the middle slag; (2) In the tapping process, the tapping hole generates rotational flow, steel slag is involved in molten steel and enters the sliding tapping hole, so that corrosion and scouring of the inner walls of the tapping hole, the inner water gap and the outer water gap flowing steel hole are increased, the service life is shortened, and the operation rate of the converter is influenced; (3) When the steel slag enters the sliding steel outlet along with molten steel and the sliding plate is closed to stop slag, the steel slag enters a slideway between the sliding plate, slag is clamped between upper and lower sliding plate bricks, the damage of the sliding surface of the sliding plate is aggravated, the service life of the sliding plate is seriously influenced, and even steel passing accidents between the sliding plates are caused.
Chinese patent document CN207828342U (patent number: 201721701961.0) discloses a quincuncial tap hole assembly brick comprising: the seamless steel pipe for assembling the inner water gap brick, the steel-tapping hole assembly end brick, the steel-tapping hole assembly transition brick, the steel-tapping hole assembly round hole steel-tapping hole brick, the steel-tapping hole assembly plum blossom steel-tapping hole tail brick, the retainer ring pipe for grouting materials, the steel-tapping hole assembly cover plate, the seamless steel pipe cross and the inner water gap pressing plate are assembled, and the plum blossom steel-tapping hole assembly brick is suitable for a converter slide slag-stopping steel-tapping device and effectively prevents or relieves the phenomenon of slag rolling caused by vortex generated by molten steel in the flowing process by virtue of plum blossom-shaped steel-flowing holes, so that the steel-tapping speed and the molten steel quality are improved. The technology of the patent is insufficient: the patent utilizes quincuncial petals to change the vector of the rotation angle of molten steel fluid in the steel tapping hole of the converter, only plays a role in inhibiting the scale and the quantity of vortex flow caused by molten steel flow, has no active slag blocking effect, gradually loses shape and fails along with the erosion of the steel tapping hole, and cannot be continuously and effectively.
Chinese patent document CN106041044B (patent No. 201610634268. X) discloses a continuous casting tundish permeable ceramic tube upper nozzle pocket brick, including an upper nozzle pocket brick body, a ceramic tube, an air chamber, an air inlet tube, wherein the upper nozzle pocket brick body is internally provided with a ceramic tube and an annular air chamber which are uniformly arranged in a circular shape, the air chamber is positioned at the bottom of the ceramic tube and is communicated with the permeable ceramic tube, the upper part of the ceramic tube extends out of the upper surface of the upper nozzle pocket brick body by 5-10 mm, the side part of the air chamber is connected with the air inlet tube, one end of the air inlet tube is communicated with the air chamber, the other end extends out of the side part of the upper nozzle pocket brick body, a connecting metal tube is communicated with an external argon gas source, after argon gas is blown in, an annular air curtain barrier is formed upwards, the molten steel entering the upper nozzle is air washed, floating and removal of inclusions are promoted, a certain number of argon bubbles enter the upper nozzle along with steel flow, stable and continuous annular air flow is formed, the problem of nodulation is not only suppressed, but also the problem of casting blank skin bubbles caused by protective argon bubbles entering into the steel is solved. The technology of the patent is insufficient: the method is mainly used for solving the problem of tundish nozzle nodulation, in order to ensure that a certain amount of argon bubbles enter the upper nozzle along with steel flow to form stable and continuous annular air flow, the ceramic tube arrangement position needs to be close to one side of the upper nozzle, so that the argon blowing action range is small, the tundish is used for continuous steel casting, and only tiny inclusions and small-particle steel slag are contained in molten steel, so that the ceramic tube arrangement mode of the tundish is not suitable for the slag blocking requirement of a converter tapping hole; in addition, the flow steel Kong Kuojing of the ladle nozzle pocket block is small, the flow rate of molten steel is small, the ceramic tube arranged in the middle of the ladle nozzle pocket block body cannot be eroded, but the diameter expansion of the converter tapping hole is large, the flow rate of molten steel is large, the ceramic tube arranged in the middle of the converter tapping hole body can be eroded, the problem that the service lives of the ceramic tube and the converter tapping hole body are asynchronous is caused, and the service life of the converter tapping hole is further influenced.
Chinese patent document CN112593043A (202011499478.5) discloses a device for reducing slag discharging amount in the tapping process of a steelmaking converter, which comprises a converter, a converter tapping hole and an air source structure; the inner wall of the converter is provided with a furnace lining, the furnace lining adopts a permanent magnesia brick layer, and a working layer brick is laid on the furnace lining; the steel tapping hole is provided with a refractory pipe with a thickness, a plurality of evenly distributed air inlet long holes are formed in the wall of the refractory pipe, an annular air chamber is arranged at the bottom of the refractory pipe, and the bottom ends of the plurality of air inlet long holes are respectively communicated with the annular air chamber. Although the vortex slag-rolling in the tapping process can be effectively restrained, the slag-discharging amount in the tapping process of the steelmaking converter is reduced, the flow of argon is reasonably regulated according to the size of a slag-opening surface blown into the converter, the slag covering the molten steel liquid surface above a tap hole is blown open by blowing argon with a certain pressure, a slag-free area is formed, vortex slag-rolling in the tapping process is avoided, and therefore, in order to ensure effective high-pressure gas flow, the diameter of an air inlet long hole of the patent is 0.5-1.5 mm, although the slag-free area can be formed above the vortex, the molten steel is easily permeated into the air inlet long hole, so that the ventilation flow is small and even the ventilation is not realized, the problem that the air inlet long hole is blocked before and after the air inlet long hole is blocked easily is required to be increased, the crack is easily generated in the air inlet long hole, the cracking and the breakage of a refractory pipe is caused, the blowing function is lost, and the service life of the tap hole is influenced.
Disclosure of Invention
According to the utility model, through the fact that the breathable ceramic rod is eccentrically arranged in the steel-tapping hole brick body along the outer direction of the thickness of the steel-tapping hole brick body, after argon is blown in, the argon bubbles form an annular air curtain barrier right in front of the periphery of the steel-tapping hole, so that steel slag which is about to enter the steel-tapping hole along with steel flow is blocked, the circumferential speed of suction vortex of the steel flow is effectively reduced above the steel-tapping hole, the height of the generated suction vortex is reduced, the key technical problem that steel slag is mixed in the steel flow flowing out of the steel-tapping hole is solved, the defect that the sliding plate slag of the existing steel-tapping hole cannot block middle-stage slag is overcome, slag tapping is realized in the whole process of the steel-tapping, the slag discharging amount of the converter is further reduced, erosion and scouring of the steel slag to the inner wall of the steel-tapping hole, the inner water gap and the outer water gap flow steel hole are further reduced, and the service life of the steel hole, the inner water gap and the outer water gap is prolonged.
The technical problems to be solved by the utility model are realized by adopting the following technical scheme: the sliding steel-tapping hole of the 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, a sliding plate and an outer water gap which are sequentially arranged outwards from one side of the steel-tapping hole mounting hole of the converter; the converter sliding steel tapping hole comprises a steel tapping hole brick body, an air chamber box, an air permeable ceramic rod, an air inlet pipe and a steel flowing hole;
the cylindrical steel flow 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 in 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 flow holes 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 to be arranged; 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 lateral 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 gas source;
the center of the cross section of the air permeable ceramic rod is positioned 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 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;
the ventilation ceramic rod is internally provided with ventilation holes along the axial direction of the ventilation ceramic rod, the ventilation holes longitudinally penetrate through the inner end face and the outer end face of the ventilation ceramic rod, and the ventilation holes are uniformly distributed on the cross section of the ventilation ceramic rod.
Preferably, the number of the breathable ceramic rods is 6-9, the number of the breathable holes is 40-80, and the inner diameter of the breathable holes is 0.18-0.20 mm.
Preferably, the breathable ceramic rod is cylindrical, the outer diameter phi of the cylinder is 20-30 mm, and the length L of the breathable ceramic rod is 200-400 mm.
The utility model is characterized in that 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 tap hole brick body is 5-10 mm.
In the utility model, preferably, a female opening is arranged at the outer end part of the tap hole brick body, and the shape and the size of the female opening are matched with those of the sub opening and the size Xiang Qie of the inner water gap.
Preferably, the tapping hole brick body is formed by adopting magnesium-carbon isostatic compaction, and the volume density is more than or equal to 2.92g/cm 3 The normal temperature compressive strength is more than or equal to 45.4Mpa, the normal temperature flexural strength is more than or equal to 22.9Mpa, the MgO content is more than or equal to 75%, and the C content is 18-19%.
The air inlet pipe is preferably 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.
In the utility model, preferably, the breathable ceramic rod is formed in the tap hole brick body by adopting zirconia corundum isostatic pressing.
The technical conception of the utility model: according to the slag blocking principle, a large number of tiny bubbles can be generated by blowing argon into the breathable ceramic rod axially arranged along the steel-tapping hole brick body, so that a circular air curtain barrier is formed right in front of the steel-tapping hole, steel slag entering the steel-tapping hole along with steel flow can be blocked, the circumferential speed of steel flow sucking vortex above the steel-tapping hole can be effectively reduced, the height of the generated sucking vortex is reduced, the steel slag floats on the surface of molten steel, the vortex is formed from the liquid level, the steel slag is distributed around the vortex, and when 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 entering the steel-tapping hole is effectively inhibited.
In addition, the vortex is formed by the surface of molten steel, the cross section area of the vortex is larger and larger from bottom to top, and the circumferential speed of the liquid level of the outer ring of the vortex is in positive correlation with the formation of the vortex and the vortex depth.
The utility model relates to a gas-permeable ceramic rod which is arranged in a tap hole brick body along the thickness direction of the tap hole brick body in an eccentric way, wherein the distance m between the outer wall of the gas-permeable ceramic rod and the outer wall of the tap hole brick body is 20-25 mm, the number of the gas-permeable ceramic rods is 6-9, the gas-permeable ceramic rods are uniformly distributed in a circular ring shape, the outer diameter phi of the gas-permeable ceramic rod is 20-30 mm, the length L of the gas-permeable ceramic rod is 200-400 mm and the like.
According to the utility model, in simulation research experiments, the ventilation ceramic rods are arranged in the steel-tapping hole brick body, after blowing, the annular air curtain barrier is formed right in front of the periphery of the steel-tapping hole, so that steel slag entering the steel-tapping hole along with steel flow can be blocked, the circumferential speed of the suction vortex of the steel flow caused above the steel-tapping hole is effectively reduced, the height of the generated suction vortex is reduced, the steel slag entering the steel-tapping hole is effectively inhibited, the key technical problem that steel slag is mixed in the steel flow flowing out of the steel-tapping hole is solved, in addition, the technical scheme of eccentric arrangement of the ventilation ceramic rods is found, the action range of blowing argon slag is enlarged, the number of the ventilation ceramic rods, the outer diameter and the blowing argon flow have direct influence on the blowing slag blocking effect, and in particular, the number of the ventilation ceramic rods and the outer diameter determine the ventilation quantity of the ventilation ceramic rods, the larger the outer diameter, and the ventilation quantity of the ventilation ceramic rods are, and the blowing argon flow has direct influence on the blowing slag blocking effect. Meanwhile, according to the technical scheme of eccentric arrangement of the outer wall of the air permeable ceramic rod in the industrial application contrast test, the action range of argon blowing slag blocking is enlarged, the slag discharging amount of a steel tapping hole is reduced, the problem that the air permeable ceramic rod is damaged due to steel flow Kong Kuojing of the steel tapping hole brick is avoided, the service life of the air permeable ceramic rod and the service life of the steel tapping hole brick body are synchronous, in addition, in the development production and application test 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 surface crack of the steel tapping hole brick body is easy to occur, the quality is influenced, and further the service life of the steel tapping hole brick is influenced.
In addition, the length L of the breathable ceramic rod is 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 affected, and if the length L is too small, the argon blowing effect, the service life and the like are also affected.
The sliding tapping hole brick of the converter designed by the utility model has the unexpected effect of tapping: according to the utility model, through the blowing slag blocking and the sliding plate slag blocking, the full-process slag tapping of converter tapping is realized, the slag discharging amount of the converter is further reduced, the phenomenon of rotational flow in the tap hole is effectively inhibited, the erosion and the scouring of steel slag to the inner wall of the steel hole, the inner water gap and the outer water gap flow steel hole are reduced, and the service lives of the sliding tap hole brick, the inner water gap and the sliding plate are prolonged.
The utility model also provides a mounting method of the converter sliding tapping hole, wherein the outer end of the converter tapping hole mounting hole is provided with a flange, the flange is connected with a mounting plate for mounting the sliding plate slag blocking device, a base plate is arranged between the mounting plate and the flange, and the mounting plate is provided with a positioning groove for mounting an inner water gap;
the installation method adopts a special positioning device, wherein the positioning device comprises a seamless steel tube, a positioning plate and a positioning oblique iron;
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, the positioning plate is provided with a bolt hole, the positioning plate is positioned at one side of the outer end of the seamless steel pipe, the positioning oblique iron is detachably arranged on the positioning plate, and the positioning oblique iron is used for being connected with the mounting plate;
the positioning oblique iron is provided with a sub-opening, and the shape and the size of the positioning oblique iron are the same as those of the sub-opening of the inner water opening;
the specific installation steps are as follows:
1) After a positioning bolt, a flat gasket and a fastening nut are adopted to combine and fix a positioning plate and a positioning wedge on a tap hole brick body, the tap hole brick body is loaded into a tap hole installation hole of a tap hole outer pocket brick and a tap hole inner pocket brick combination by a forklift, the positioning wedge correctly falls into a positioning groove for installing an inner water gap, and a movable joint bolt is used for fixing the positioning wedge and a mounting plate by a pneumatic tool;
2) An air inlet pipeline is arranged between the flange plate and the base plate, the air inlet pipeline is in butt joint communication with the air inlet pipe, the air inlet pipeline is a heat-resistant stainless steel round pipe, the outer diameter is 12-16 mm, and the wall thickness is 1.2-2.3 mm; the seamless steel pipe and the positioning plate are arranged, so that accurate positioning is realized when the steel tapping hole brick body is installed, and 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, so that the flow of molten steel in the tapping hole is not influenced;
3) Shaking the converter to a position with a steel flow hole vertically upwards, adopting magnesium-calcium gunning material to gunning gaps among the steel-hole brick body, the steel-hole outer pocket brick and the steel-hole inner pocket brick, baking and sintering for 25-35 minutes, arranging a waterproof paste at the inner end part of the breathable ceramic rod, wherein the waterproof paste is used for protecting a breathable surface and preventing the problems of poor air permeability and the like caused by water seepage and seepage;
4) Shaking a steel tapping hole of a converter to the front of the converter, dismantling a positioning oblique iron, and installing an inner water gap of a sliding plate slag blocking device into a positioning groove;
5) After the sliding plate and the outer water gap are arranged on the sliding tapping hole mechanism, the sliding tapping hole mechanism is transported and arranged on the mounting plate by a forklift, the sliding tapping hole mechanism and the mounting plate are fixed together by using a movable joint bolt and a surface pressure bolt, and finally the opening and closing debugging of the sliding tapping hole is carried out to finish the installation of the sliding tapping hole of the converter, and the sliding tapping hole mechanism is used for controlling the opening and the 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 in the prior art.
The model specification of the positioning bolt is M30X80, the model specification of the flat pad is phi 16, and the model specification of the fastening nut is M30, which are all commercial products.
The utility model also provides a whole-course tapping slag blocking method, which adopts the converter sliding tapping hole, and the air inlet of the air inlet pipe is connected with argon supply equipment, and comprises the following steps:
the converter starts to shake the converter, prepares to tap, and simultaneously opens argon, and the argon flow is controlled at 20-30 NL/min;
and closing the sliding plate after the tapping of the converter is completed, and closing argon while shaking the converter back to a normal smelting station.
The utility model has the beneficial effects that:
1) According to the utility model, the ventilation ceramic rod is arranged in the steel-tapping hole brick body, the ventilation ceramic rod is provided with the through tiny ventilation holes which are uniformly distributed along the axial direction, a large amount of tiny argon bubbles can be formed after argon is blown in, the argon bubbles form an annular air curtain barrier right in front of the periphery of the steel-tapping hole, so that not only is the steel slag entering the steel-tapping hole along with steel flow suppressed, but also the circumferential speed of the steel flow suction vortex caused above the steel-tapping hole is effectively reduced, the height of the generated suction vortex is reduced, the steel slag is effectively suppressed from immersing into the steel-tapping hole, the key technical problem that the steel slag is mixed in the steel flow flowing out of the steel-tapping hole in the tapping process is solved, the defect that the slag in the middle stage cannot be blocked by the sliding plate slag of the sliding steel-tapping hole of the existing converter is eliminated, the steel-tapping whole process is realized by the slag blocking of the steel-tapping baffle, the slag discharging quantity of the converter is further reduced, the corrosion and the service life of the steel slag to the steel slag in the steel-tapping hole, the inner water mouth and the outer flow steel hole is further reduced. Compared with the prior sliding tapping hole sliding plate slag-stopping tapping technology of the converter, the slag quantity per ton of steel of the converter is reduced by more than 0.5kg, and the service lives of the tapping hole, the inner nozzle and the sliding plate of the converter are respectively improved by more than 50 times, 30 times and 3 times in a same ratio.
2) According to the utility model, 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, 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 20-25 mm, the optimal slag blocking 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 blocking is enlarged, the slag discharging quantity of the steel-tapping hole is reduced, the impact of steel flow on the air permeable ceramic rod can be reduced, the problem that the air permeable ceramic rod is damaged by steel Kong Kuojing of the steel-tapping hole brick is avoided, the service life of the air permeable ceramic rod is synchronous with that of the steel-tapping hole brick body, the service life of the air permeable ceramic rod is compared with that of the steel-tapping hole brick body is applied in a test mode, the slag discharging quantity per ton steel is reduced by more than 0.1kg, and the service life of the converter is prolonged by more than 20 times per unit.
3) According to the utility model, the air permeable ceramic rod, the air chamber box and the air inlet pipe are sequentially arranged in 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, wherein the air permeable ceramic rod can form a large number of tiny bubbles through the air holes which are uniformly distributed along the axial direction, and can effectively prevent molten steel from penetrating, and the air chamber box is arranged between the air permeable ceramic rod and the air inlet pipe and serves as a transfer piece for gas exchange, so that the argon flow is uniformly distributed, the length of the air permeable ceramic rod can be shortened, the preparation difficulty of a steel-tapping hole of a converter is reduced, the preparation cost is reduced, and popularization and application are 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 utility model is solved.
5) According to the utility model, the air chamber box is formed by splicing the two annular plates with the L-shaped longitudinal sections, and the slots are formed in the annular plates, so that the breathable 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 utility model, the inner end of the air permeable ceramic rod extends out of the inner end face of the steel-tapping hole brick body, so that the position of the air permeable ceramic rod can be fixed from the outer part of the steel-tapping 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 isostatically molded in the steel-tapping hole brick body, 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 sliding tap hole structure of a transfer furnace in an embodiment of the utility model;
FIG. 2 is a sectional view of a sliding tap hole structure A-A of a transfer furnace according to an embodiment of the present utility model;
FIG. 3 is a schematic view of a structure of a plenum box according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram showing assembly of a sliding tap hole and a positioning chute of a transfer furnace according to an embodiment of the utility model;
FIG. 5 is a schematic view showing installation of a sliding tap hole of a transfer furnace in an embodiment of the utility model;
in the figure, 1 tap hole brick body; 2, an air chamber box; 3, a breathable ceramic rod; 4, an air inlet pipe; 5 seamless steel tube; 6, bolt holes; 7, positioning a plate; 8, waterproof plaster; 9 slots; 10 a swing bolt; 11, positioning a chute; 12 positioning bolts; 13 flat pad pads; 14, fastening a nut; 15 flange plates; a 16 substrate; 17 mounting plates; 18 sliding the tap hole mechanism; 19 inner nozzle; 20 sliding plates; 21 outer water gap; 22 air inlet pipeline; 23 tapping hole outer pocket brick; 24 tapping hole inner brick cup; 25 magnesium-calcium gunning mix.
Detailed Description
The utility model is further illustrated, but not limited to, by the following examples and figures.
In the embodiment, the magnesia-calcium gunning mix 25, the seamless steel pipe 5, the positioning bolts 12, the flat gasket 13, the fastening nuts 14 and the air inlet pipeline 22 are all made of conventional materials and are commercially available products.
Example 1
The sliding steel-tapping hole of the converter is shown in fig. 5, 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 installation hole of the steel-tapping 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 outwards from one side of the installation hole of the steel-tapping hole of the converter. As shown in fig. 1, 2 and 3, the sliding steel tapping hole of the converter comprises a steel tapping hole brick body 1, an air chamber box 2, an air permeable ceramic rod 3, an air inlet pipe 4 and a steel tapping hole.
The tapping hole brick body 1 is formed by adopting magnesium-carbon isostatic compaction, and the volume density is more than or equal to 2.92g/cm 3 The normal temperature compressive strength is more than or equal to 45.4Mpa, the normal temperature flexural strength is more than or equal to 22.9Mpa, the MgO content is more than or equal to 75%, and the C content is 18-19%. The outer end of the tap hole brick body 1 is provided with a female hole, and the shape and the size of the female hole are combined with those of the sub-hole of the inner water gap 19, namely Xiang Qie.
The steel hole brick body 1 is cylindrical, a cylindrical steel flowing hole penetrates through the center of the steel hole brick body 1 along the axial direction of the steel 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 in the steel hole brick body 1 from the inner end to the outer end along the axial direction of the steel hole brick body 1.
The cross section of the air chamber box 2 is annular, the air chamber box 2 and the steel flow holes 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 portion of the air chamber box 2 is provided with slots 9, the breathable ceramic rods 3 are inserted into the slots 9, and the shapes, the sizes and the number of the slots 9 are matched with those of the ceramic rods 3 inserted into the slots 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 annular plate 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 inner end part of the air permeable ceramic rod 3 extending out of the steel-tapping hole brick body 1 is 10mm, and a waterproof patch 8 is arranged on the inner end face of the air permeable ceramic rod 3.
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 20mm.
The breathable ceramic rod 3 is formed in the tap hole brick body 1 by adopting zirconia corundum isostatic pressing, the breathable ceramic rod 3 is cylindrical, the outer diameter phi of the cylinder is 30mm, and the length L of the breathable ceramic rod 3 is 400mm.
The ventilation ceramic rod 3 is internally provided with ventilation holes along the axial direction of the ventilation ceramic rod 3, the ventilation holes longitudinally penetrate through the inner end face and the outer end face of the ventilation ceramic rod 3, and the ventilation holes are uniformly distributed on the cross section of the ventilation ceramic rod 3.
The diameter of the air holes is 0.18mm, the air holes are uniformly distributed in the shape of 3 concentric circles, the number of the air holes of the 1 st ring is 9, the number of the air holes of the 2 nd ring is 18, and the number of the air holes of the 3 rd ring is 27 from inside to outside along the radial direction of the air-permeable ceramic rod 3.
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 outer end side part of the steel tapping hole brick body 1, the air inlet pipe 4 is used for being connected with an external argon gas source, the air inlet pipe 4 is made of a heat-resistant stainless steel round pipe, the outer diameter is 16mm, and the wall thickness is 2.3mm.
As shown in fig. 4 and 5, in the installation method of the sliding steel tapping hole of the converter, a flange 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 blocking device is connected with the flange 15, a base plate 16 is arranged between the installation plate 17 and the flange 15, and a positioning groove for installing an inner water gap 19 is arranged on the installation plate 17.
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 chute 11.
The seamless steel pipe 5 is sleeved in a steel flowing hole of the steel tapping hole brick body 1, a positioning plate 7 is welded in the seamless steel pipe 5, the positioning plate 7 is provided with a bolt hole 6, the positioning plate 7 is located at one side of the outer end of the seamless steel pipe 5, a positioning oblique iron 11 is detachably arranged on the positioning plate 7, and the positioning oblique iron 11 is used for being connected with a mounting plate 17.
The positioning chute 11 is provided with a sub-opening, and the shape and the size of the sub-opening are the same as those of the inner nozzle 19.
The specific installation steps are as follows:
1) After the positioning bolt 12, the flat pad 13 and the fastening nut 14 are adopted to combine and fix the positioning plate 7 and the positioning wedge 11 on the tapping hole brick body 1, the tapping hole brick body 1 is loaded into a tapping hole installation hole combined by the tapping hole outer pocket brick 23 and the tapping hole inner pocket brick 24 by using a forklift, the positioning wedge 11 is enabled to fall into a positioning groove for installing the inner water gap 19 correctly, and the movable joint bolt 10 is utilized to fix the positioning wedge 11 and the installation plate 17 by using a pneumatic tool.
2) An air inlet pipeline 22 is arranged between the flange 15 and the base plate 16, and the air inlet pipeline 22 is in butt joint communication with the air inlet pipe 4.
The air inlet pipe 4 is communicated with an external argon gas source through an air inlet pipeline 22.
The air inlet pipeline 22 is made of a heat-resistant stainless steel round tube, the outer diameter of the air inlet pipeline is 16mm, and the wall thickness of the air inlet pipeline is 2.3mm.
3) And (3) shaking the converter to a position with a steel flow hole vertically upwards, adopting a magnesia-calcium gunning material 25 to guniting gaps between the steel-hole brick body 1 and the steel-hole outer seat brick 23 and the steel-hole inner seat brick 24, and then baking and sintering for 35 minutes.
4) The tapping hole of the converter is rocked to the front of the converter, the positioning chute 11 is removed, and the inner nozzle 19 of the sliding plate slag blocking device is installed in the positioning groove.
5) After the sliding plate 20 and the outer water gap 21 are installed on the sliding steel tapping hole mechanism 18, the sliding steel tapping hole mechanism 18 is transported and installed on the installation plate 17 by a forklift, the sliding steel tapping hole mechanism 18 and the installation plate 17 are fixed together by using movable joint bolts and surface pressure bolts, and finally the opening and closing debugging of the sliding steel tapping hole is carried out, so that the installation of the sliding steel tapping hole of the converter is completed, and the sliding steel tapping hole mechanism 18 is used for controlling the opening and the closing of the sliding plate 20.
The utility model discloses a method for carrying out whole-process tapping slag stopping 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:
the converter starts to shake the converter, prepares to tap, and simultaneously opens argon, and the argon flow is controlled at 30NL/min.
And closing the sliding plate 20 after the tapping of the converter is completed, and closing argon when the converter is rocked back to a normal smelting station.
Example 2
The difference from the sliding tap hole of the converter according to example 1 is that:
the distance m between the outer wall of the air permeable ceramic rod 3 and the outer wall of the tapping hole brick body 1 is 25mm.
The outer diameter phi of the breathable ceramic rod 3 is 20mm, and the length L of the breathable ceramic rod 3 is 200mm.
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 of the inner end part of the steel tapping hole brick body 1 is 5mm.
The diameter of the ventilation holes arranged in the ventilation ceramic rod 3 is 0.2mm, the ventilation holes are uniformly distributed in the shape of 3 concentric circles, the number of the ventilation holes of the 1 st ring is 6, the number of the ventilation holes of the 2 nd ring is 12, and the number of the ventilation holes of the 3 rd ring is 18 from inside to outside along the radial direction of the ventilation ceramic rod 3.
The number of the breathable ceramic rods 3 is 9.
The outer diameter of the air inlet pipe 4 and the air inlet pipeline 22 is 12mm, and the wall thickness is 1.2mm.
The utility model discloses a method for carrying out whole-process tapping slag stopping by utilizing a sliding tapping hole of a converter, which comprises the following steps:
the converter starts to shake the converter, prepares to tap, and simultaneously opens argon, and argon flow is controlled at 20NL/min, and closes argon 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 according to example 1 is that:
the distance m between the outer wall of the air permeable ceramic rod 3 and the outer wall of the tapping hole brick body 1 is 22mm.
The outer diameter phi of the breathable ceramic rod 3 is 22mm, and the length L of the breathable ceramic rod 3 is 300mm.
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 of the inner end part of the steel tapping hole brick body 1 is 7mm.
The diameter of the ventilation holes arranged in the ventilation ceramic rod 3 is 0.19mm, the ventilation holes are uniformly distributed in the shape of 3 concentric circles, the number of the ventilation holes of the 1 st ring is 8, the number of the ventilation holes of the 2 nd ring is 16, and the number of the ventilation holes of the 3 rd ring is 24.
The number of the breathable ceramic rods 3 is 9.
The outer diameter of the air inlet pipe 4 and the air inlet pipeline 22 is 14mm, and the wall thickness is 2.3mm.
According to the installation method of the converter sliding steel tapping hole, the flange plate 15 is arranged at the outer end of the installation hole of the converter steel tapping hole, the flange plate 15 is connected with the installation plate 17 for installing the sliding plate slag blocking 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 chute 11.
The seamless steel pipe 5 is sleeved in a steel flowing hole of the steel tapping hole brick body 1, a positioning plate 7 is welded in the seamless steel pipe 5, the positioning plate 7 is provided with a bolt hole 6, the positioning plate 7 is located at one side of the outer end of the seamless steel pipe 5, a positioning oblique iron 11 is detachably arranged on the positioning plate 7, and the positioning oblique iron 11 is used for being connected with a mounting plate 17.
The positioning chute 11 is provided with a sub-opening, and the shape and the size of the sub-opening are the same as those of the inner nozzle 19.
The specific installation steps are as follows:
1) After the positioning bolt 12, the flat pad 13 and the fastening nut 14 are adopted to combine and fix the positioning plate 7 and the positioning wedge 11 on the tapping hole brick body 1, the tapping hole brick body 1 is loaded into a tapping hole installation hole combined by the tapping hole outer pocket brick 23 and the tapping hole inner pocket brick 24 by using a forklift, the positioning wedge 11 is enabled to fall into a positioning groove for installing the inner water gap 19 correctly, and the movable joint bolt 10 is utilized to fix the positioning wedge 11 and the installation plate 17 by using a pneumatic tool.
2) An air inlet pipeline 22 is arranged between the flange 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 a position with a steel flow hole vertically upwards, adopting a magnesia-calcium gunning material 25 to guniting gaps between the steel-hole brick body 1 and the steel-hole outer seat brick 23 and the steel-hole inner seat brick 24, and baking and sintering for 30 minutes.
4) The tapping hole of the converter is rocked to the front of the converter, the positioning chute 11 is removed, and the inner nozzle 19 of the sliding plate slag blocking device is installed in the positioning groove.
5) After the sliding plate 20 and the outer water gap 21 are installed on the sliding steel tapping hole mechanism 18, the sliding steel tapping hole mechanism 18 is transported and installed on the installation plate 17 by a forklift, the sliding steel tapping hole mechanism 18 and the installation plate 17 are fixed together by using movable joint bolts and surface pressure bolts, and finally the opening and closing debugging of the sliding steel tapping hole is carried out, so that the installation of the sliding steel tapping hole of the converter is completed, and the sliding steel tapping hole mechanism 18 is used for controlling the opening and the closing of the sliding plate 20.
The utility model discloses a method for carrying out whole-process tapping slag stopping by utilizing a sliding tapping hole of a converter, which comprises the following steps:
argon is introduced when the converter starts to shake the converter and prepares for tapping, the argon flow is controlled at 25NL/min, the argon is introduced when the converter starts to shake the converter and prepares for tapping, the argon flow is controlled at 30NL/min, and the argon is closed when the converter is completely tapped, the slide plate 20 is closed and the converter is shaken back to a normal smelting station.
Comparative example 1
Chinese patent document CN207828342U (patent number 201721701961.0) discloses a plum blossom steel tapping hole assembly brick, wherein the width of a sub-mouth of an inner water gap is 45mm, a zirconium ring is embedded in an upper sliding plate, a zirconium plate is embedded in a lower sliding plate, and slag blocking steel tapping is carried out by adopting a sliding steel tapping hole sliding plate.
Comparative example 2
In the embodiment 1 of the utility model, 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 is changed into the arrangement that the center of the cross section of the air permeable ceramic rod 3 is overlapped with the center line of the cross section of the steel-tapping hole brick body 1, and the other parts are identical.
The application test and the comparison test are carried out on the 120t converter sliding steel tapping hole of the Yinshan section steel Limited of Laiwu iron and 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 slag quantity per ton steel of the converter applying the steel tapping hole of the utility model is less than 2.35kg, the same ratio of the steel tapping hole of the converter is reduced by more than 0.5kg, the service lives of the steel tapping hole, the inner water gap and the sliding plate of the converter are respectively increased by more than 50 times, 30 times and 3 times, and meanwhile, the steel penetrating accidents caused by slag inclusion of the sliding plate are avoided.
The utility model has more reasonable outer eccentric process arrangement of arranging the center of the cross section of the ventilation ceramic rod 3 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 blowing slag blocking effect is better than that of the comparative example 2, compared with the average slag quantity per ton steel of the converter in the comparative example 2, the same ratio is reduced by more than 0.1kg, and the service lives of the steel-tapping hole, the inner water gap and the sliding plate of the converter are prolonged by 20 times, 5 times and more than 1 time. The comparison results are shown in Table 1.
TABLE 1
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present utility model and are not limiting. Although the present utility model has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present utility model, which is intended to be covered by the appended claims.
Claims (7)
1. The sliding steel-tapping hole of the converter is arranged in a steel-tapping hole mounting hole of the converter, one side close to the converter is used 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 outwards from one side of the steel-tapping hole mounting hole of the converter; 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), an air permeable ceramic rod (3), an air inlet pipe (4) and a steel flowing hole;
the cylindrical steel flow 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 in 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 steel flow holes 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); 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 lateral 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 gas 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;
the ventilation ceramic rod (3) is internally provided with ventilation holes along the axial direction of the ventilation ceramic rod (3), the ventilation holes longitudinally penetrate through the inner end face and the outer end face of the ventilation ceramic rod (3), and the ventilation holes are uniformly distributed on the cross section of the ventilation ceramic rod (3);
the number of the breathable ceramic rods (3) is 6-9, the number of the breathable holes is 40-80, the inner diameter of the breathable holes is 0.18-0.20 mm, and the length L of the breathable ceramic rods (3) is 200-400 mm;
the tapping hole brick body (1) adopts magnesium-carbon isostatic compaction, and the volume density is more than or equal to 2.92g/cm 3 The normal temperature compressive strength is more than or equal to 45.4Mpa, the normal temperature flexural strength is more than or equal to 22.9Mpa, the MgO content is more than or equal to 75%, and the C content is 18-19%;
the breathable ceramic rod (3) is formed in the tap hole brick body (1) by adopting zirconia corundum isostatic pressing.
2. A converter slide tap hole according to claim 1, wherein: the breathable ceramic rod (3) is cylindrical, and the outer diameter phi of the cylinder is 20-30 mm.
3. A converter slide tap hole according to claim 1, wherein: 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 steel tapping hole brick body (1) is 5-10 mm.
4. A converter slide tap hole according to claim 1, wherein: the outer end part of the tapping hole brick body (1) is provided with a female hole, and the shape and the size of the female hole are combined with those of the child hole of the inner water gap (19) Xiang Qie.
5. A converter slide tap hole according to claim 1, wherein: the air inlet pipe (4) is a heat-resistant stainless steel round pipe, the outer diameter is 12-16 mm, and the wall thickness is 1.2-2.3 mm.
6. A method of installing a sliding tap hole of a rotary furnace according to any one of claims 1 to 5, characterized by: the outer end of the installation hole of the tapping hole of the converter is provided with a flange plate (15), the flange plate (15) is connected with an installation plate (17) for installing the sliding plate slag blocking device, 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, wherein the positioning device comprises a seamless steel tube (5), a positioning plate (7) and a positioning oblique iron (11);
the seamless steel pipe (5) is sleeved in a steel flow hole of the steel tapping hole brick body (1), a positioning plate (7) is welded in the seamless steel pipe (5), the positioning plate (7) is provided with a bolt hole (6), the positioning plate (7) is positioned at one side of the outer end of the seamless steel pipe (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 inclined iron (11) is provided with a sub-opening, and the shape and the size of the sub-opening are the same as those of the inner water opening (19);
the specific installation steps are as follows:
1) combining and fixing a positioning plate (7) on a steel-tapping hole brick body (1) and a positioning oblique iron (11) by adopting a positioning bolt (12), a flat gasket (13) and a fastening nut (14), then loading the steel-tapping hole brick body (1) into a steel-tapping hole mounting hole combined by a steel-tapping hole outer seat brick (23) and a steel-tapping hole inner seat brick (24) by using a forklift, enabling the positioning oblique iron (11) to accurately fall into a positioning groove for mounting an inner water gap (19), and fixing the positioning oblique iron (11) with a mounting plate (17) by using a pneumatic tool through a movable joint bolt (10);
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 is 12-16 mm, the wall thickness is 1.2-2.3 mm, and the air inlet pipeline (22) is in butt joint communication with the air inlet pipe (4);
3) Shaking the converter to a position with a steel flow hole (100) vertically upwards, adopting a magnesia-calcium gunning material (25) to guniting gaps between a steel-tapping hole brick body (1) and a steel-tapping hole outer seat brick (23) and a steel-tapping hole inner seat brick (24), and then baking and sintering for 25-35 minutes;
4) Shaking a steel tapping hole of a converter to the front of the converter, dismantling a positioning oblique iron (11), and installing an inner water gap (19) of a sliding plate slag blocking device into a positioning groove;
5) After a sliding plate (20) and an outer water gap (21) are installed on a sliding tapping hole mechanism (18), the sliding tapping hole mechanism (18) is transported and installed on an installation plate (17) by a forklift, the sliding tapping hole mechanism (18) and the installation plate (17) are fixed together by using a movable joint bolt and a surface pressure bolt, and finally the opening and the closing of the sliding tapping hole are debugged, so that the installation of the sliding tapping hole of the converter is completed, and the sliding tapping hole mechanism (18) is used for controlling the opening and the closing of the sliding plate (20).
7. A full-process tapping slag blocking method adopting the converter sliding tapping hole according to any one of claims 1-5, characterized by comprising the following steps:
the converter starts to shake the converter, prepares to tap, and simultaneously opens argon, and the argon flow is controlled at 20-30 NL/min;
and closing the sliding plate (20) after the tapping of the converter is completed, and closing argon when the converter is rocked 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 CN114891949A (en) | 2022-08-12 |
| CN114891949B true CN114891949B (en) | 2023-10-24 |
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Family Applications (1)
| 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 |
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| CN (1) | CN114891949B (en) |
| WO (1) | WO2023241241A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (5)
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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 |
| 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 |
| 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 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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
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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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114891949A (en) | 2022-08-12 |
| WO2023241241A1 (en) | 2023-12-21 |
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