CN107365160A - It is a kind of quickly to go out steel smelting integral tap-hole casing brick and its production method - Google Patents

It is a kind of quickly to go out steel smelting integral tap-hole casing brick and its production method Download PDF

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Publication number
CN107365160A
CN107365160A CN201710542583.4A CN201710542583A CN107365160A CN 107365160 A CN107365160 A CN 107365160A CN 201710542583 A CN201710542583 A CN 201710542583A CN 107365160 A CN107365160 A CN 107365160A
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parts
casing brick
hole casing
brick
integral tap
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CN107365160B (en
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李涛
孙逊
张程
郑雪枫
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ANSHAN HE FENG REFRACTORY MATERIAL Co Ltd
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ANSHAN HE FENG REFRACTORY MATERIAL Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
    • C04B35/043—Refractories from grain sized mixtures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • 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
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/38—Non-oxide ceramic constituents or additives
    • C04B2235/3804—Borides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/38—Non-oxide ceramic constituents or additives
    • C04B2235/3817—Carbides
    • C04B2235/3821—Boron carbides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/38—Non-oxide ceramic constituents or additives
    • C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
    • C04B2235/3873—Silicon nitrides, e.g. silicon carbonitride, silicon oxynitride
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/40—Metallic constituents or additives not added as binding phase
    • C04B2235/402—Aluminium
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
    • C04B2235/422—Carbon
    • C04B2235/425—Graphite
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    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
    • C04B2235/428—Silicon
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/77—Density

Abstract

It is a kind of quickly to go out steel smelting integral tap-hole casing brick and its production method, by the processing compound scheme for optimizing integral tap-hole casing brick, while its excellent resistance to thermal shock stability is kept, corrosion resistance, inoxidizability and wear resistance are improved, while reduces length and the ratio (L/D) of internal diameter.The integral tap-hole casing brick of the present invention is due to optimizing profile arrangement, and molten steel is concentrated and do not disperseed during tapping, and the resistance to material of integral tap-hole casing brick, which is corroded, to be reduced；Due to reducing graphite addition on processing compound, increase limit particle size, effectively increase the bulk density of casing brick, complexing magnalium cementing agent and nano ceramic material are introduced simultaneously, significantly improves the elevated temperature strength of the resistance to material of sinter layer of casing brick, and the final corrosion-resistant property for ensureing casing brick and scour resistance are enhanced, under severe quick tapping smelting condition, service life does not reduce not only, slightly improves on the contrary, benefit is brought to steel mill and Nai Cai suppliers.

Description

It is a kind of quickly to go out steel smelting integral tap-hole casing brick and its production method
Technical field
The present invention relates to steelwork converter functional refractory for steelmaking, more particularly to a kind of satisfaction quickly to go out steel smelting The integral tap-hole casing brick of technique and its preparation, production method.
Background technology
In converter lining, integral tap-hole casing brick acquires a special sense, and it is that molten steel enters ladle only by converter One passage.Because integral tap-hole casing brick steel -passing amount is big, is washed away by high-temperature molten steel, aoxidize etch, condition of work is quite disliked It is bad.The material of Whole Taphole of LD casing brick, for boundary, was changed to using not burning till MgO-C with 1980 by burning till MgO bricks etc. Brick, improves durability, and present almost all uses MgO-C bricks.MgO-C bricks are due to excellent resistance to thermal shock stability, institute The tapping hole casing brick used with saying the material to be suitable under conditions of thermal shock is big.
If the short life of integral tap-hole casing brick, converter can be reduced due to being replaced as frequently as tapping hole casing brick Utilization rate, but also can increase sleeve pipe and the expense of sleeve pipe gunning material.
The wall thickness of increase sleeve pipe can extend the life-span of tapping hole.The common method of increase wall thickness is to reduce the endoporus chi of sleeve pipe It is very little.But using this method and increased wall thickness is limited can become the tapping time because casing inner diameter is too small It is long.
First, the long tapping time can extend the steel stream of outflow tapping hole and the time of atmosphere.In addition, outflow The diameter of steel stream is smaller, and its contact surface with air is bigger, and this steel stream-air contact can cause nitrogen pick-up in steel.For being permitted For the steel grade of more titaniferous, this may have a strong impact on the quality of downstream steel, because in the process of lower step, Wu Fayou Effect ground removes nitrogen contained in steel.
Secondly, the long tapping time can cause the temperature loss of steel larger, thus need higher tapping temperature.Its Secondary, this can extend converter smelting cycle time, cause productivity ratio to decline.
Finally, tapping overlong time can also extend the time of contact of molten steel and slag and converter tapping wing furnace lining, thus right Furnace lining adversely affects.
In recent years, domestic some large-scale steel mills, such as Anshan iron and steel plant, are testing and are implementing smelting process of quickly tapping.Anshan iron and steel plant in the past The tapping time average of most of converters is 6-8 minutes, if the structure and material of optimization integral tap-hole casing brick, On the premise of ensureing that original service life is constant, the tapping time is foreshortened into average out to 3-4 minutes, great benefit will be produced：
1st, quick tapping, shortens steel-making minute time 2-3 per stove, will smelt 2-3 stove molten steel daily per block converter more, will be big It is big to improve converter yield, create considerable benefit；
2nd, quick tapping rate is improved, the steel-making time can be shortened, can reduce that molten steel is heated into pouring temperature is desired To the electrical heating time, final to reduce molten steel heat loss, this is in 1 year benefit for having more than ten million yuan of steel mill；
3rd, quick tapping, the molten steel chemical analysis for delivering to ladle change reduction, improve steel；
4th, quick tapping so that ladle refining time, ladle radiation heat loss and electric arc power consumption can all be reduced, together When, the ladle refining time shortens, and can substantially reduce the consumption of ladle lining because converter heat loss is reduced；
Certainly, quick tapping is realized, its key is the structure design for optimizing integral tap-hole casing brick, that is, increases The internal diameter size of tapping hole casing brick, increase the sectional area of tapping channel, quick tapping could be realized.And increase tapping hole sleeve pipe The internal diameter size of brick, obtained with losing the wall thickness of tapping hole casing brick, therefore subtracted in working lining thickness, that is, wall thickness On the premise of few, the service life for not reducing tapping hole casing brick how is realizedOptimize the material of original integral tap-hole casing brick Matter is crucial.
The content of the invention
Quickly go out steel smelting integral tap-hole casing brick and its production method it is an object of the invention to provide a kind of, lead to The processing compound scheme of optimization integral tap-hole casing brick is crossed, while its excellent resistance to thermal shock stability is kept, is improved resistance to Corrosion, inoxidizability and wear resistance, and the design concept of original integral tap-hole casing brick is broken through, optimization design, reduce Length and the ratio of internal diameter (L/D), a kind of new integral tap-hole that disclosure satisfy that quick tapping smelting process is provided for steel mill Casing brick and its preparation, production method.
In order to achieve the above object, the present invention is realized using following technical scheme：
A kind of quickly to go out steel smelting integral tap-hole casing brick, the integral tap-hole casing brick is by following weight hundred The raw material of ratio is divided to be prepared：The big crystallization of grain diameter 8-5mm big crystallization magnesia particle 0-12 parts, grain diameter 5-3mm Magnesia particle 5-20 parts, grain diameter 3-1mm big crystallization magnesia particle 20-35 parts, grain diameter 1-0mm big crystallization magnesia Particle 20-35 parts, the big crystallization magnesia powder 13-20 parts of the purpose of particle diameter 200, the positive 6-10 parts of the crystalline flake graphite of the mesh of particle diameter 895, particle diameter 99 metallic aluminium powder 0-3 parts of 200 mesh, metal silicon powder 0-3 parts, boron carbide 0-2 parts of 325 mesh, 325 mesh calcium boride 0-1 parts, High-temperature resin powder 0-2 parts, hard resin powder 0-2 parts, solid phosphoric acid aluminum dihydrogen+complexing magnalium cementing agent 0.2-2 parts, nano ceramics Material 0-0.2 parts, liquid resin 2-5 parts.
Described big crystallization magnesia is 985 big crystallization magnesia.
The solid phosphoric acid aluminum dihydrogen and be complexed magnalium cementing agent weight proportion be：1：0.2-0.5.
It is more than 75% containing nano aluminium oxide+nano-silicon nitride resultant in the nano ceramic material, nano aluminium oxide：Nanometer Silicon nitride=1：0.5-1.5.
A kind of preparation method for quickly going out steel smelting integral tap-hole casing brick, comprises the following steps：
1) weighing dispensing is carried out by above-mentioned raw materials composition, granularity, part by weight, tolerance is less than 0.02 kilogram, and closing is standby；
2) load weighted 200 mesh 985 is crystallized greatly to magnesia powder, the metallic aluminium powder of 200 mesh 99, metal silicon powder, the carbonization of 325 mesh Boron, 325 mesh calcium borides, high-temperature resin powder, hard resin powder, solid phosphoric acid aluminum dihydrogen+complexing magnalium cementing agent, nano ceramics material Material, revolved premixed device mixing 25-30 minutes with conical double ribbon in advance, it is stand-by as premixing flour；
3) by the 985 of load weighted particle diameter 8-5mm big crystallization magnesia, particle diameter 5-3mm 985 big crystallization magnesia, particle diameter 3- 1mm 985 big crystallization magnesia, the 985 of particle diameter 1-0mm big crystallization magnesia, put into roller, electrically heated planetary mixing In machine, mixed once 6-12 minutes, liquid resin is added again, secondary mixing 5-15 minutes, then adds 895 mesh crystalline flake graphites Just, mixed at high speed 5-15 minutes three times, premixing flour, four mixed at high speed 5-15 minutes are eventually adding, drop temperature is controlled in 40- 55 DEG C, finally discharge, mixed pug was placed in 2-4 hours at room temperature, you can shaping production.
A kind of production method for quickly going out steel smelting integral tap-hole casing brick, using above-mentioned mixed pug to entirety Tapping hole casing brick carries out shaping production, ensures that former integral tap-hole casing brick length L is constant, outer diameter D3On the premise of constant, By flow rate calculation, L/D ratio is optimized to 6-10, wherein D is interior collar extension diameter average value；Meanwhile D1-D2=10- 25mm, D1For internal orifice diameter, D2For collar extension diameter；Finally, both ensured that converter molten steel was quickly tapped within 3-4 minutes, and ensured again Steel molten steel is concentrated, and is not dissipated, and the resistance to material of casing brick is corroded and reduced.
Compared with prior art, the beneficial effects of the invention are as follows：
1) integral tap-hole casing brick of the invention disclosure satisfy that steel mill's converter in 3-4 due to optimizing profile arrangement The smelting requirements quickly tapped in minute, it is average to reduce tapping minute time 1-3, the loss of heat is not only substantially reduced, and The production efficiency of steel mill's pneumatic steelmaking, Benefit are heightened；
2) integral tap-hole casing brick of the invention is due to optimizing profile arrangement, and molten steel, which is concentrated, during tapping does not disperse, The resistance to material of integral tap-hole casing brick, which is corroded, to be reduced；
3) integral tap-hole casing brick of the invention increases limit particle size, effectively carried due to reducing graphite addition The high bulk density of casing brick, while complexing magnalium cementing agent and nano ceramic material are introduced, significantly improve casing brick The elevated temperature strength of the resistance to material of sinter layer, the final corrosion-resistant property for ensureing casing brick and scour resistance are enhanced, severe Under quick tapping smelting condition, service life does not reduce not only, slightly improves, is brought to steel mill and Nai Cai suppliers on the contrary Benefit.
4) present invention meets the new integral tap-hole casing brick of quick tapping smelting process, by above measure, not only The smelting requirements quickly tapped in 3-4 minutes are disclosure satisfy that, great economic benefit is brought to steel mill, and tapping hole casing brick Service life also slightly improves.So that certain steel mill makes steel head factory 210 tons of five work area converter as an example, after above measure, tapping Time by original 6-7 minutes, drops to averagely 4 minutes, tapping hole casing brick service life is by original average 172 times, improve To 181 tanks.Part physical and chemical index detection is shown in Table 1：
Table 1：
Brief description of the drawings
Fig. 1 is integral tap-hole casing brick masonry construction schematic diagram.
Fig. 2 is former integral tap-hole casing brick structural representation.
Fig. 3 is integral tap-hole casing brick structural representation of the present invention.
In figure：Brick cup, 3- tapping holes material for repairing, 4- tapping hole integral cannulas brick, 5- in 1- Converters lining brick, 2- tapping holes Tapping hole outer brick cup, 6- converter steel constructions.
Embodiment
The embodiment of the present invention is described further below in conjunction with the accompanying drawings：
See Fig. 1-Fig. 3, the present invention is a kind of quickly to go out steel smelting integral tap-hole casing brick, the integral tap-hole sleeve pipe Brick is prepared by the raw material of following weight percents：Grain diameter 8-5mm big crystallization magnesia particle 0-12 parts, particle Footpath 5-3mm big crystallization magnesia particle 5-20 parts, grain diameter 3-1mm big crystallization magnesia particle 20-35 parts, grain diameter 1- 0mm big crystallization magnesia particle 20-35 parts, the big crystallization magnesia powder 13-20 parts of the purpose of particle diameter 200, the crystalline flake graphite of the mesh of particle diameter 895 Positive 6-10 parts, 99 metallic aluminium powder 0-3 parts of the mesh of particle diameter 200, metal silicon powder 0-3 parts, boron carbide 0-2 parts of 325 mesh, 325 mesh Calcium boride 0-1 parts, German import high-temperature resin powder0-2 parts, hard resin powder 0-2 parts, solid phosphoric acid two Hydrogen aluminium+complexing magnalium cementing agent 0.2-2 parts, nano ceramic material 0-0.2 parts, liquid resin 2-5 parts.
Described big crystallization magnesia is 985 big crystallization magnesia.
The solid phosphoric acid aluminum dihydrogen and be complexed magnalium cementing agent weight proportion be：1：0.2-0.5.
It is more than 75% containing nano aluminium oxide+nano-silicon nitride resultant in the nano ceramic material, nano aluminium oxide：Nanometer Silicon nitride=1：0.5-1.5.
A kind of preparation method for quickly going out steel smelting integral tap-hole casing brick, comprises the following steps：
1) weighing dispensing is carried out by above-mentioned raw materials composition, granularity, part by weight, tolerance is less than 0.02 kilogram, and closing is standby；
2) load weighted 200 mesh 985 is crystallized greatly to magnesia powder, the metallic aluminium powder of 200 mesh 99, metal silicon powder, the carbonization of 325 mesh Boron, 325 mesh calcium borides, high-temperature resin powder, hard resin powder, solid phosphoric acid aluminum dihydrogen+complexing magnalium cementing agent, nano ceramics material Material, revolved premixed device mixing 25-30 minutes with conical double ribbon in advance, it is stand-by as premixing flour；
3) by the 985 of load weighted particle diameter 8-5mm big crystallization magnesia, particle diameter 5-3mm 985 big crystallization magnesia, particle diameter 3- 1mm 985 big crystallization magnesia, the 985 of particle diameter 1-0mm big crystallization magnesia, put into roller, electrically heated planetary mixing In machine, mixed once 6-12 minutes, liquid resin is added again, secondary mixing 5-15 minutes, then adds 895 mesh crystalline flake graphites Just, mixed at high speed 5-15 minutes three times, premixing flour, four mixed at high speed 5-15 minutes are eventually adding, drop temperature is controlled in 40- 55 DEG C, finally discharge, mixed pug was placed in 2-4 hours at room temperature, you can shaping production.
A kind of production method for quickly going out steel smelting integral tap-hole casing brick, using above-mentioned mixed pug to entirety Tapping hole casing brick carries out shaping production, ensures that former integral tap-hole casing brick length L is constant, outer diameter D3On the premise of constant, By flow rate calculation, L/D ratio is optimized to 6-10, wherein D is interior collar extension diameter average value；Meanwhile D1-D2=10- 25mm, D1For internal orifice diameter, D2For collar extension diameter；Finally, both ensured that converter molten steel was quickly tapped within 3-4 minutes, and ensured again Steel molten steel is concentrated, and is not dissipated, and the resistance to material of casing brick is corroded and reduced.
Below by taking the coverter pig integral tap-hole casing brick of 210 tons of five work area of certain steel mill steel-making head factory as an example, this is illustrated Invention：
Certain steel mill makes steel head factory 210 tons of five work area converter, existing 3 years since 2014 formally put into production use, steel Kind extends the fine work steel grade based on mild steel, ultra-low-carbon steel, the deck of boat, silicon steel till now, production capacity by initial common steel grade 4000000 tons.At present per stove duration of heat 28-35 minutes, the tapping time is average 6.5 minutes, smelts 28-32 stoves daily.
Further to reduce the tapping time, thermal loss is reduced, improves steel quality, while improves converter smelting efficiency, Steel mill proposes the problem quickly tapped at the beginning of 2017, first in four work area pilots, the popularization of other backward work areas.It is required that I am public Take charge of and design is optimized to the integral tap-hole casing brick of the existing supply of material, and require further to improve resistance to material amount, in casing brick Working lining is thinned, and washes away under conditions of aggravation, strives that service life does not reduce.
On the basis of long-term observation and lot of experiments, my company draws with reference to itself core technology, will make steel the work of head factory five 210 tons of area Whole Taphole of LD casing brick has done following improvement：
1st, for quick tapping integral tap-hole casing brick, molten steel flow speed is fast, it is big to wash away, short with the steel contacts time Handling characteristics, the bulk density of casing brick is improved, it is very crucial to improve sintering strength.
The present invention considers from the bulk density and abrasion resistance for being effectively improved integral tap-hole casing brick, reduces adding for graphite Enter amount, increase the limit particle size of magnesia, while be the sintering strength for further enhancing integral tap-hole casing brick, introduce network Magnalium cementing agent is closed, so as to reach the erosion rate for effectively reducing casing brick, meets the smelting requirements quickly tapped.
The Example formulations of concrete scheme are shown in Table 2.
Table 2：
2nd, Fig. 2, original integral tap-hole casing brick, its length L=1900mm, outer diameter D are seen3=300mm, tapping hole internal orifice Diameter D1=160mm, external orifice of steel-tapping hole diameter D2=155mm, interior collar extension diameter average value D=157.5mm, D1-D2=5mm, L/ D=13.33.To reach the purpose that steel mill's converter is quickly tapped, it is necessary to which traditional design principle is optimized.
See Fig. 1, the present invention is to ensure that former integral tap-hole casing brick length L=1900mm is constant, outer diameter D3=300mm On the premise of constant, by flow rate calculation, tapping hole internal orifice diameter D1 is changed to 200mm, external orifice of steel-tapping hole diameter D2It is changed to 190mm, interior collar extension average value D=195mm, L/D ratio are optimized to 9.7, meanwhile, D1-D2=10mm.Finally, converter is both ensured Molten steel is quickly tapped within 3-4 minutes, is ensured that tapping molten steel is concentrated again, is not dissipated, and the resistance to material of casing brick is corroded and reduced.

Claims (6)

1. a kind of quickly go out steel smelting integral tap-hole casing brick, it is characterised in that the integral tap-hole casing brick be by The raw material of following weight percents is prepared：Grain diameter 8-5mm big crystallization magnesia particle 0-12 parts, grain diameter 5- 3mm big crystallization magnesia particle 5-20 parts, grain diameter 3-1mm big crystallization magnesia particle 20-35 parts, grain diameter 1-0mm Big crystallization magnesia particle 20-35 parts, the big crystallization magnesia powder 13-20 parts of the purpose of particle diameter 200, the mesh of particle diameter 895 crystalline flake graphite just 6-10 parts, 99 metallic aluminium powder 0-3 parts of the mesh of particle diameter 200, metal silicon powder 0-3 parts, boron carbide 0-2 parts of 325 mesh, 325 purposes Calcium boride 0-1 parts, high-temperature resin powder 0-2 parts, hard resin powder 0-2 parts, solid phosphoric acid aluminum dihydrogen+complexing magnalium cementing agent 0.2- 2 parts, nano ceramic material 0-0.2 parts, liquid resin 2-5 parts.
2. one kind according to claim 1 quickly goes out steel smelting integral tap-hole casing brick, it is characterised in that described Big crystallization magnesia is 985 big crystallization magnesia.
3. one kind according to claim 1 quickly goes out steel smelting integral tap-hole casing brick, it is characterised in that described solid Body aluminium dihydrogen phosphate and be complexed magnalium cementing agent weight proportion be：1：0.2-0.5.
4. one kind according to claim 1 quickly goes out steel smelting integral tap-hole casing brick, it is characterised in that described to receive It is more than 75% containing nano aluminium oxide+nano-silicon nitride resultant in rice ceramic material, nano aluminium oxide：Nano-silicon nitride=1：0.5- 1.5。
5. a kind of preparation method of integral tap-hole casing brick as described in claim 1-4 wherein any one, its feature exist In comprising the following steps：
1) weighing dispensing is carried out by above-mentioned raw materials composition, granularity, part by weight, tolerance is less than 0.02 kilogram, and closing is standby；
2) load weighted 200 mesh 985 is crystallized greatly magnesia powder, the metallic aluminium powder of 200 mesh 99, metal silicon powder, 325 mesh boron carbides, 325 mesh calcium borides, high-temperature resin powder, hard resin powder, solid phosphoric acid aluminum dihydrogen+complexing magnalium cementing agent, nano ceramic material, Revolved premixed device mixing 25-30 minutes with conical double ribbon in advance, it is stand-by as premixing flour；
3) by the 985 of load weighted particle diameter 8-5mm big crystallization magnesia, particle diameter 5-3mm 985 big crystallization magnesia, particle diameter 3-1mm 985 big crystallization magnesia, the 985 of particle diameter 1-0mm big crystallization magnesia, put into roller, electrically heated planetary mixer, Mixed once 6-12 minutes, liquid resin is added again, secondary mixing 5-15 minutes, is then adding 895 mesh crystalline flake graphites just, three Secondary mixed at high speed 5-15 minutes, premixing flour, four mixed at high speed 5-15 minutes being eventually adding, drop temperature is controlled at 40-55 DEG C, Finally discharge, mixed pug was placed in 2-4 hours at room temperature, you can shaping production.
6. a kind of production method as claimed in claim 1 for quickly going out steel smelting integral tap-hole casing brick, its feature exist In carrying out shaping production to integral tap-hole casing brick using above-mentioned mixed pug, ensure former integral tap-hole casing brick length It is constant to spend L, outer diameter D3On the premise of constant, by flow rate calculation, L/D ratio is optimized to 6-10, wherein D is that interior collar extension is straight Footpath average value；Meanwhile D1-D2=10-25mm, D1For internal orifice diameter, D2For collar extension diameter；Finally, both ensured converter molten steel in 3- Quickly tapped in 4 minutes, ensure that tapping molten steel is concentrated again, do not dissipate, and the resistance to material of casing brick is corroded and reduced.
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