CN106631053A - Refractory material for steel tapping hole of converter and preparation method for refractory material - Google Patents
Refractory material for steel tapping hole of converter and preparation method for refractory material Download PDFInfo
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- C04B35/63448—Polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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Abstract
The invention relates to a refractory material for a steel tapping hole of a converter and a preparation method for the refractory material. The technical scheme of the invention is as follows: the preparation method comprises the steps of spraying the surface of a magnesia-carbon brick body with a glaze slip coating with the thickness of 1mm to 2mm, carrying out drying, and carrying out heat preservation, thereby preparing the refractory material for the steel tapping hole of the converter. A preparation method for the magnesia-carbon brick body comprises the steps: mulling magnesia fines, flake graphite fines, expandable graphite, aluminum powder and silicon powder in a high-speed mulling machine, so as to prepare mixed fine powder; and then, mulling fused magnesia granules and artificial graphite granules, adding phenol-formaldehyde resin into the mixture, carrying out mulling, then, adding granulated graphite and the mixed fine powder into the mulled mixture, carrying out mulling, carrying out aging, carrying out shaping, and carrying out standing, thereby preparing the magnesia-carbon brick body. A preparation method for glaze slip comprises the steps of adding water into glass powder, spodumene, potassium feldspar, silicon micropowder, potassium carbonate, SiC fines, chrome green and aluminum dihydrogen phosphate, which serve as raw materials of the glaze slip, and carrying out grinding, thereby preparing the glaze slip. The refractory material for the steel tapping hole of the converter, prepared by the preparation method, has the characteristics that the thermal shock stability is good, the integrity is good, the oxidation resistance is good, the erosion resistance is good, and the life is long.
Description
Technical field
The invention belongs to technical field of refractory materials.More particularly to a kind of converter taphole refractory material and its preparation side
Method.
Technical background
Converter taphole is the pipeline that the molten steel through smelting enters into ladle from converter, and its structure and quality are to molten steel smelting
The product quality of refining, production cycle and production stability and efficiency have directly impact, and material and life-span are even more production safety
Guarantee, the access times of converter taphole are that the comprehensive of converter smelting index one of embodies.
The high temperature of molten steel washes away and corrodes when converter taphole will be subject to tap in use, while magnesium at high temperature
In carbon brick tapping hole meeting invar liquid there is oxidation reaction in the various factors such as atmosphere, substantially reduce service life；Tap each time
In front and back tapping hole position refractory material is also faced with temperature impact jumpy, and if things go on like this, refractory material can be various above-mentioned
There is institutional framework under factor collective effect to deteriorate and damage, significantly affect performance and the life-span of converter taphole.Converter current
Tapping hole adopts Magnesia-carbon material more at the position, although Magnesia-carbon material of the crystalline flake graphite content more than 10% has good anti-thermal shock steady
It is qualitative, but still the needs that tapping hole is used can not be met, and its structure becomes loose after crystalline flake graphite oxidation, thermal shock resistance and
Anti- molten steel scouring capability further declines.Converter current tapping hole commonly uses the life-span in 5 ~ 7 days, 120 stoves or so of tapping, tapping
The mismatch and the longer replacing construction band of tapping hole refractory material of mouthful refractory material and converter other position refractory lifes
Blowing out, cooling for coming etc. becomes a big factor of restriction production efficiency.
The content of the invention
It is contemplated that overcoming prior art problem, it is therefore an objective to provide a kind of high temperature resistant, anti-oxidant, thermal shock resistance excellent
And the converter taphole refractory material of long service life and preparation method thereof.
For achieving the above object, the technical solution adopted in the present invention is：One layer of glaze slip is sprayed in magnesia carbon brick body surface,
The coating layer thickness of the glaze slip is 1 ~ 2mm；It is dried 12 ~ 24 hours under the conditions of 110 DEG C, is warming up to 240 DEG C, is incubated 24 hours,
Prepared converter taphole refractory material.
The raw material and its content of the magnesia carbon brick body be：Fused magnesite particle be 55 ~ 72wt%, magnesia powder be 7 ~
20wt%, synthetic graphite particles be 1 ~ 5wt%, granulated graphite be 5 ~ 10wt%, expanded graphite be 0.2 ~ 2wt%, crystalline flake graphite fine powder
For 2 ~ 5wt%, aluminium powder is 1 ~ 3wt%, and silica flour is 1 ~ 2wt%, and phenolic resin is 2 ~ 4wt%.
By the magnesia carbon brick bulk stock and its content, by magnesia powder, crystalline flake graphite fine powder, expanded graphite, aluminium powder and
Silica flour mixed grind 1 ~ 5 minute in high speed kolleroang, makes mixing fine powders；Fused magnesite particle, synthetic graphite particles are placed in mixed
Mixed grind 1 ~ 4 minute in mill, adds phenolic resin mixed grind 3 ~ 6 minutes, add granulated graphite and the mixing fine powders mixed grind 10 ~
25 minutes, ageing mixture 12 ~ 24 hours, isostatic pressing was placed 12 ~ 24 hours naturally, and magnesia carbon brick body is obtained.
The raw material and its content of the glaze slip be：Glass dust be 40 ~ 65wt%, spodumene be 5 ~ 25wt%, potassium feldspar be 10 ~
20wt%, silicon powder be 2 ~ 8wt%, potassium carbonate be 1 ~ 3wt%, SiC fine powders be 3 ~ 10wt%, chrome green be 1 ~ 3wt%, aluminium dihydrogen phosphate
For 1 ~ 3wt%.
By the glaze slip raw material and its content, add in the glaze slip raw material and account for glaze slip raw material 40 ~ 70wt%'s of gross mass
Water, altogether mill, obtains glaze slip.
Content of MgO >=97% in the fused magnesite particle；In fused magnesite particle：The fused magnesite particle of 1 ~ 3mm accounts for 25
~ 45wt%, particle diameter is less than 1mm and the fused magnesite particle more than or equal to 0.1mm accounts for 55 ~ 75wt%.
Content of MgO >=97% in the fused magnesite fine powder, the particle diameter≤0.074mm of fused magnesite fine powder.
Synthetic graphite particles' particle diameter be 0.1 ~ 1mm, the granulated graphite particle diameter be 0.5 ~ 0.1mm, the scale stone
Black particle diameter≤0.074mm.
The aluminium powder particle diameter is≤0.045mm.
The silica flour particle diameter is≤0.088mm.
The granulated graphite particle diameter is 0.1 ~ 0.5mm, and content of graphite is 32 ~ 37wt%.
The phenolic resin is one or more of liquid thermoset phenol-formaldehyde resin powder and liquid thermoplastic's phenolic resin.
Due to adopting above-mentioned technical proposal, the present invention to have the advantages that compared with prior art：
Carbon source also introduces synthetic graphite particles, granulated graphite and expansion in addition to crystalline flake graphite in the magnesia carbon brick body of the present invention
Graphite.Due to being almost not bound between crystalline flake graphite and magnesia particle, the crystalline flake graphite when Impact direction is parallel with crystalline flake graphite
It is very possible to exist as formation of crack, accelerate the extension of magnesia carbon brick body interior crackle.The crystalline flake graphite addition of the present invention is little,
Can be greatly reduced or avoid the generation of said circumstances.Granulated graphite is distributed with the graphite flake layer in expanded graphite in three-dimensional random,
And all there is certain interval between graphite flake layer；Synthetic graphite particles, granulated graphite and expanded graphite with the use of not only
Be conducive to the thermal stress inside absorbing material, and they have good deformability under stress, significantly weaken
Destruction of the thermal stress to magnesia carbon brick body construction.Thus, the obtained tapping hole refractory material of the present invention has excellent anti-thermal shock
Property.
The present invention also coats glaze slip coating using in magnesia carbon brick body surface, and the glaze slip coating starts at 900 DEG C or so
Soften and seal magnesia carbon brick body surface major part pore, oxidation of the magnesia carbon brick body before tapping can be greatly reduced；With temperature
The rising of degree, the liquid phase in glaze slip coating is permeated toward magnesia carbon brick body interior, and continuation protects the carbon in magnesia carbon brick body not by oxygen
Change；At the same time the SiO in glaze slip coating2、Cr2O3React etc. component and magnesia powder, increase the table of magnesia carbon brick body
Layer intensity, not only increases the globality of magnesia carbon brick body, and improves the anti-molten steel scouring capability of magnesia carbon brick body.Due to glaze
Slurry coating is relatively thin, and the later stage can repeatedly spray, to guarantee magnesia carbon brick body in carbon source aoxidize less as far as possible, and give full play to
Carbon source resists the effect of thermal shock, and the steel heat that goes out of prepared converter taphole refractory material is 160 ~ 180 stoves, so as to notable
Extend the tapping hole life-span.
Obtained converter taphole refractory material of the invention is after testing：Apparent porosity is 3.8 ~ 7.9%；Bulk density is
2.65~3.07g/cm3；Strength at normal temperature reaches 14.6 ~ 23.6MPa；High temperature break resistant intensity is up to 16.1 ~ 24.7MPa；Through
Weight-loss ratio is 2.4 ~ 3.8% after the non-oxidizability test of 2 hours under the conditions of 1400 DEG C of air atmospheres, thermal shock resistance and anti-erosion
Function admirable.
Therefore, the converter taphole refractory material that prepared by the present invention not only has excellent thermal shock resistance, globality, resists
The characteristics of oxidisability, corrosion resistance, and the characteristics of with life-span length.
Specific embodiment
With reference to specific embodiment, the invention will be further described, not to the restriction of its protection domain.
It is first that the raw material Unify legislation involved by this specific embodiment is as follows to avoid repeating, in embodiment not
Repeat again：
Content of MgO >=97% in the fused magnesite particle；In fused magnesite particle：The fused magnesite particle of 1 ~ 3mm accounts for 25 ~
45wt%, particle diameter is less than 1mm and the fused magnesite particle more than or equal to 0.1mm accounts for 55 ~ 75wt%.
Content of MgO >=97% in the fused magnesite fine powder, the particle diameter≤0.074mm of fused magnesite fine powder.
Synthetic graphite particles' particle diameter be 0.1 ~ 1mm, the granulated graphite particle diameter be 0.5 ~ 0.1mm, the scale stone
Black particle diameter≤0.074mm.
The aluminium powder particle diameter is≤0.045mm.
The silica flour particle diameter is≤0.088mm.
The granulated graphite particle diameter is 0.1 ~ 0.5mm, and content of graphite is 32 ~ 37wt%.
Embodiment 1
A kind of converter taphole refractory material and preparation method thereof.Preparation method is described in the present embodiment：In this body surface of magnesia carbon brick
Face sprays one layer of glaze slip, and the coating layer thickness of the glaze slip is 1 ~ 2mm；It is dried 12 ~ 24 hours under the conditions of 110 DEG C, is warming up to 240
DEG C, 24 hours are incubated, converter taphole refractory material is obtained.
The raw material and its content of the magnesia carbon brick body be：Fused magnesite particle be 55 ~ 61wt%, magnesia powder be 17 ~
20wt%, synthetic graphite particles are 1 ~ 3wt%, and granulated graphite is 8 ~ 10wt%, and expanded graphite is 0.2 ~ 0.8wt%, and crystalline flake graphite is thin
Powder is 4 ~ 5wt%, and aluminium powder is 1 ~ 1.7wt%, and silica flour is 1.6 ~ 2wt%, and phenolic resin is 3.4 ~ 4wt%.
By the magnesia carbon brick bulk stock and its content, by magnesia powder, crystalline flake graphite fine powder, expanded graphite, aluminium powder and
Silica flour mixed grind 1 ~ 5 minute in high speed kolleroang, makes mixing fine powders；Fused magnesite particle, synthetic graphite particles are placed in mixed
Mixed grind 1 ~ 4 minute in mill, adds phenolic resin mixed grind 3 ~ 6 minutes, add granulated graphite and the mixing fine powders mixed grind 10 ~
25 minutes, ageing mixture 12 ~ 24 hours, isostatic pressing was placed 12 ~ 24 hours naturally, and magnesia carbon brick body is obtained.
The raw material and its content of the glaze slip be：Glass dust is 40 ~ 48wt%, and spodumene is 18 ~ 25wt%, and potassium feldspar is 17
~ 20wt%, silicon powder be 2 ~ 4wt%, potassium carbonate be 2.4 ~ 3wt%, SiC fine powders be 8 ~ 10wt%, chrome green be 1 ~ 1.7wt%, di(2-ethylhexyl)phosphate
Hydrogen aluminium is 2.4 ~ 3wt%.
By the glaze slip raw material and its content, add in the glaze slip raw material and account for glaze slip raw material 40 ~ 50wt%'s of gross mass
Water, altogether mill, obtains glaze slip.
The phenolic resin is liquid thermoset phenol-formaldehyde resin powder.
Converter taphole refractory material obtained by the present embodiment is after testing：Apparent porosity is 4.3 ~ 6.2%；Bulk density
For 2.83 ~ 2.97g/cm3；Strength at normal temperature reaches 16.9 ~ 20.7MPa；High temperature break resistant intensity is up to 17.3 ~ 21.2MPa；Through
Weight-loss ratio is 2.7 ~ 3.3% after the non-oxidizability test of 2 hours under the conditions of 1400 DEG C of air atmospheres, thermal shock resistance and anti-erosion
Function admirable.
Embodiment 2
A kind of converter taphole refractory material and preparation method thereof.Preparation method is described in the present embodiment：In this body surface of magnesia carbon brick
Face sprays one layer of glaze slip, and the coating layer thickness of the glaze slip is 1 ~ 2mm；It is dried 12 ~ 24 hours under the conditions of 110 DEG C, is warming up to 240
DEG C, 24 hours are incubated, converter taphole refractory material is obtained.
The raw material and its content of the magnesia carbon brick body be：Fused magnesite particle be 61 ~ 67wt%, magnesia powder be 12 ~
17wt%, synthetic graphite particles be 3 ~ 5wt%, granulated graphite be 7 ~ 9wt%, expanded graphite be 0.8 ~ 1.4wt%, crystalline flake graphite fine powder
For 3 ~ 4wt%, aluminium powder is 1.7 ~ 2.3wt%, and silica flour is 1.3 ~ 1.7wt%, and phenolic resin is 2.7 ~ 3.4wt%.
By the magnesia carbon brick bulk stock and its content, by magnesia powder, crystalline flake graphite fine powder, expanded graphite, aluminium powder and
Silica flour mixed grind 1 ~ 5 minute in high speed kolleroang, makes mixing fine powders；Fused magnesite particle, synthetic graphite particles are placed in mixed
Mixed grind 1 ~ 4 minute in mill, adds phenolic resin mixed grind 3 ~ 6 minutes, add granulated graphite and the mixing fine powders mixed grind 10 ~
25 minutes, ageing mixture 12 ~ 24 hours, isostatic pressing was placed 12 ~ 24 hours naturally, and magnesia carbon brick body is obtained.
The raw material and its content of the glaze slip be：Glass dust is 48 ~ 56wt%, and spodumene is 12 ~ 18wt%, and potassium feldspar is 13
~ 17wt%, silicon powder be 4 ~ 6wt%, potassium carbonate be 1.7 ~ 2.4wt%, SiC fine powders be 5 ~ 8wt%, chrome green be 1.7 ~ 2.4wt%, phosphorus
Acid dihydride aluminium is 1.7 ~ 2.4wt%.
By the glaze slip raw material and its content, add in the glaze slip raw material and account for glaze slip raw material 50 ~ 60wt%'s of gross mass
Water, altogether mill, obtains glaze slip.
The phenolic resin is liquid thermoplastic's phenolic resin.
Converter taphole refractory material obtained by the present embodiment is after testing：Apparent porosity is 3.8 ~ 5.7%；Bulk density
For 2.88 ~ 3.07g/cm3；Strength at normal temperature reaches 19.8 ~ 23.6MPa；High temperature break resistant intensity is up to 20.4 ~ 24.7MPa；Through
Weight-loss ratio is 2.4 ~ 2.8% after the non-oxidizability test of 2 hours under the conditions of 1400 DEG C of air atmospheres, thermal shock resistance and anti-erosion
Function admirable.
Embodiment 3
A kind of converter taphole refractory material and preparation method thereof.Preparation method is described in the present embodiment：In this body surface of magnesia carbon brick
Face sprays one layer of glaze slip, and the coating layer thickness of the glaze slip is 1 ~ 2mm；It is dried 12 ~ 24 hours under the conditions of 110 DEG C, is warming up to 240
DEG C, 24 hours are incubated, converter taphole refractory material is obtained.
The raw material and its content of the magnesia carbon brick body be：Fused magnesite particle be 67 ~ 72wt%, magnesia powder be 7 ~
12wt%, synthetic graphite particles are 2 ~ 4wt%, and granulated graphite is 5 ~ 7wt%, and expanded graphite is 1.4 ~ 2wt%, and crystalline flake graphite fine powder is
2 ~ 3wt%, aluminium powder is 2.3 ~ 3wt%, and silica flour is 1 ~ 1.4wt%, and phenolic resin is 2 ~ 2.7wt%.
By the magnesia carbon brick bulk stock and its content, by magnesia powder, crystalline flake graphite fine powder, expanded graphite, aluminium powder and
Silica flour mixed grind 1 ~ 5 minute in high speed kolleroang, makes mixing fine powders；Fused magnesite particle, synthetic graphite particles are placed in mixed
Mixed grind 1 ~ 4 minute in mill, adds phenolic resin mixed grind 3 ~ 6 minutes, add granulated graphite and the mixing fine powders mixed grind 10 ~
25 minutes, ageing mixture 12 ~ 24 hours, isostatic pressing was placed 12 ~ 24 hours naturally, and magnesia carbon brick body is obtained.
The raw material and its content of the glaze slip be：Glass dust be 56 ~ 65wt%, spodumene be 5 ~ 12wt%, potassium feldspar be 10 ~
13wt%, silicon powder be 6 ~ 8wt%, potassium carbonate be 1 ~ 1.7wt%, SiC fine powders be 3 ~ 5wt%, chrome green be 2.4 ~ 3wt%, biphosphate
Aluminium is 1 ~ 1.7wt%.
By the glaze slip raw material and its content, add in the glaze slip raw material and account for glaze slip raw material 60 ~ 70wt%'s of gross mass
Water, altogether mill, obtains glaze slip.
The phenolic resin is the mixture of liquid thermoset phenol-formaldehyde resin powder and liquid thermoplastic's phenolic resin.
Converter taphole refractory material obtained by the present embodiment is after testing：Apparent porosity is 5.1 ~ 6.9%；Bulk density
For 2.75 ~ 2.93g/cm3；Strength at normal temperature reaches 15.3 ~ 19.2MPa；High temperature break resistant intensity is up to 16.8 ~ 20.6MPa；Through
Weight-loss ratio is 2.9 ~ 3.3% after the non-oxidizability test of 2 hours under the conditions of 1400 DEG C of air atmospheres, thermal shock resistance and anti-erosion
Function admirable.
Embodiment 4
A kind of converter taphole refractory material and preparation method thereof.Preparation method is described in the present embodiment：In this body surface of magnesia carbon brick
Face sprays one layer of glaze slip, and the coating layer thickness of the glaze slip is 1 ~ 2mm；It is dried 12 ~ 24 hours under the conditions of 110 DEG C, is warming up to 240
DEG C, 24 hours are incubated, converter taphole refractory material is obtained.
The raw material and its content of the magnesia carbon brick body be：Fused magnesite particle be 55 ~ 61wt%, magnesia powder be 17 ~
20wt%, synthetic graphite particles are 3 ~ 5wt%, and granulated graphite is 8 ~ 10wt%, and expanded graphite is 0.8 ~ 1.4wt%, and crystalline flake graphite is thin
Powder is 2 ~ 3wt%, and aluminium powder is 2.3 ~ 3wt%, and silica flour is 1.6 ~ 2wt%, and phenolic resin is 2.7 ~ 3.4wt%.
By the magnesia carbon brick bulk stock and its content, by magnesia powder, crystalline flake graphite fine powder, expanded graphite, aluminium powder and
Silica flour mixed grind 1 ~ 5 minute in high speed kolleroang, makes mixing fine powders；Fused magnesite particle, synthetic graphite particles are placed in mixed
Mixed grind 1 ~ 4 minute in mill, adds phenolic resin mixed grind 3 ~ 6 minutes, add granulated graphite and the mixing fine powders mixed grind 10 ~
25 minutes, ageing mixture 12 ~ 24 hours, isostatic pressing was placed 12 ~ 24 hours naturally, and magnesia carbon brick body is obtained.
The raw material and its content of the glaze slip be：Glass dust is 40 ~ 48wt%, and spodumene is 18 ~ 25wt%, and potassium feldspar is 17
~ 20wt%, silicon powder be 2 ~ 4wt%, potassium carbonate be 2.4 ~ 3wt%, SiC fine powders be 8 ~ 10wt%, chrome green be 1 ~ 1.7wt%, di(2-ethylhexyl)phosphate
Hydrogen aluminium is 2.4 ~ 3wt%.
By the glaze slip raw material and its content, add in the glaze slip raw material and account for glaze slip raw material 40 ~ 50wt%'s of gross mass
Water, altogether mill, obtains glaze slip.
The phenolic resin is liquid thermoset phenol-formaldehyde resin powder.
Converter taphole refractory material obtained by the present embodiment is after testing：Apparent porosity is 5.3 ~ 7.1%；Bulk density
For 2.65 ~ 2.82g/cm3；Strength at normal temperature reaches 15.3 ~ 18.8MPa；High temperature break resistant intensity is up to 16.6 ~ 19.3MPa；Through
Weight-loss ratio is 3.1 ~ 3.5% after the non-oxidizability test of 2 hours under the conditions of 1400 DEG C of air atmospheres, thermal shock resistance and anti-erosion
Function admirable.
Embodiment 5
A kind of converter taphole refractory material and preparation method thereof.Preparation method is described in the present embodiment：In this body surface of magnesia carbon brick
Face sprays one layer of glaze slip, and the coating layer thickness of the glaze slip is 1 ~ 2mm；It is dried 12 ~ 24 hours under the conditions of 110 DEG C, is warming up to 240
DEG C, 24 hours are incubated, converter taphole refractory material is obtained.
The raw material and its content of the magnesia carbon brick body be：Fused magnesite particle be 61 ~ 67wt%, magnesia powder be 12 ~
17wt%, synthetic graphite particles are 2 ~ 4wt%, and granulated graphite is 5 ~ 7wt%, and expanded graphite is 1.4 ~ 2wt%, and crystalline flake graphite fine powder is
4 ~ 5wt%, aluminium powder is 1 ~ 1.7wt%, and silica flour is 1 ~ 1.4wt%, and phenolic resin is 3.4 ~ 4wt%.
By the magnesia carbon brick bulk stock and its content, by magnesia powder, crystalline flake graphite fine powder, expanded graphite, aluminium powder and
Silica flour mixed grind 1 ~ 5 minute in high speed kolleroang, makes mixing fine powders；Fused magnesite particle, synthetic graphite particles are placed in mixed
Mixed grind 1 ~ 4 minute in mill, adds phenolic resin mixed grind 3 ~ 6 minutes, add granulated graphite and the mixing fine powders mixed grind 10 ~
25 minutes, ageing mixture 12 ~ 24 hours, isostatic pressing was placed 12 ~ 24 hours naturally, and magnesia carbon brick body is obtained.
The raw material and its content of the glaze slip be：Glass dust is 48 ~ 56wt%, and spodumene is 12 ~ 18wt%, and potassium feldspar is 13
~ 17wt%, silicon powder be 4 ~ 6wt%, potassium carbonate be 1.7 ~ 2.4wt%, SiC fine powders be 5 ~ 8wt%, chrome green be 1.7 ~ 2.4wt%, phosphorus
Acid dihydride aluminium is 1.7 ~ 2.4wt%.
By the glaze slip raw material and its content, add in the glaze slip raw material and account for glaze slip raw material 50 ~ 60wt%'s of gross mass
Water, altogether mill, obtains glaze slip.
The phenolic resin is liquid thermoplastic's phenolic resin.
Converter taphole refractory material obtained by the present embodiment is after testing：Apparent porosity is 4.3 ~ 5.9%；Bulk density
For 2.84 ~ 3.05g/cm3；Strength at normal temperature reaches 17.1 ~ 21.3MPa；High temperature break resistant intensity is up to 17.9 ~ 22.3MPa；Through
Weight-loss ratio is 2.5 ~ 2.9% after the non-oxidizability test of 2 hours under the conditions of 1400 DEG C of air atmospheres, thermal shock resistance and anti-erosion
Function admirable.
Embodiment 6
A kind of converter taphole refractory material and preparation method thereof.Preparation method is described in the present embodiment：In this body surface of magnesia carbon brick
Face sprays one layer of glaze slip, and the coating layer thickness of the glaze slip is 1 ~ 2mm；It is dried 12 ~ 24 hours under the conditions of 110 DEG C, is warming up to 240
DEG C, 24 hours are incubated, converter taphole refractory material is obtained.
The raw material and its content of the magnesia carbon brick body be：Fused magnesite particle be 67 ~ 72wt%, magnesia powder be 7 ~
12wt%, synthetic graphite particles be 1 ~ 3wt%, granulated graphite be 7 ~ 9wt%, expanded graphite be 0.2 ~ 0.8wt%, crystalline flake graphite fine powder
For 3 ~ 4wt%, aluminium powder is 1.7 ~ 2.3wt%, and silica flour is 1.3 ~ 1.7wt%, and phenolic resin is 2 ~ 2.7wt%.
By the magnesia carbon brick bulk stock and its content, by magnesia powder, crystalline flake graphite fine powder, expanded graphite, aluminium powder and
Silica flour mixed grind 1 ~ 5 minute in high speed kolleroang, makes mixing fine powders；Fused magnesite particle, synthetic graphite particles are placed in mixed
Mixed grind 1 ~ 4 minute in mill, adds phenolic resin mixed grind 3 ~ 6 minutes, add granulated graphite and the mixing fine powders mixed grind 10 ~
25 minutes, ageing mixture 12 ~ 24 hours, isostatic pressing was placed 12 ~ 24 hours naturally, and magnesia carbon brick body is obtained.
The raw material and its content of the glaze slip be：Glass dust be 56 ~ 65wt%, spodumene be 5 ~ 12wt%, potassium feldspar be 10 ~
13wt%, silicon powder be 6 ~ 8wt%, potassium carbonate be 1 ~ 1.7wt%, SiC fine powders be 3 ~ 5wt%, chrome green be 2.4 ~ 3wt%, biphosphate
Aluminium is 1 ~ 1.7wt%.
By the glaze slip raw material and its content, add in the glaze slip raw material and account for glaze slip raw material 60 ~ 70wt%'s of gross mass
Water, altogether mill, obtains glaze slip.
The phenolic resin is the mixture of liquid thermoset phenol-formaldehyde resin powder and liquid thermoplastic's phenolic resin.
Converter taphole refractory material obtained by the present embodiment is after testing：Apparent porosity is 6.2 ~ 7.9%；Bulk density
For 2.69 ~ 2.81g/cm3；Strength at normal temperature reaches 14.6 ~ 17.9MPa；High temperature break resistant intensity is up to 16.1 ~ 18.3MPa；Through
Weight-loss ratio is 3.4 ~ 3.8% after the non-oxidizability test of 2 hours under the conditions of 1400 DEG C of air atmospheres, thermal shock resistance and anti-erosion
Function admirable.
This specific embodiment has the advantages that compared with prior art：
Carbon source also introduces synthetic graphite particles, granulation stone in addition to crystalline flake graphite in the magnesia carbon brick body of this specific embodiment
Ink and expanded graphite.Due to being almost not bound between crystalline flake graphite and magnesia particle, when Impact direction is parallel with crystalline flake graphite
Crystalline flake graphite probably exists as formation of crack, accelerates the extension of magnesia carbon brick body interior crackle.This specific embodiment
Crystalline flake graphite addition is little, can be greatly reduced or avoid the generation of said circumstances.Graphite flake in granulated graphite and expanded graphite
All there is certain interval between graphite flake layer in three-dimensional random distribution in layer；Synthetic graphite particles, granulated graphite and expansion stone
Ink with the use of the thermal stress not only contributed to inside absorbing material, and they have well deformation under stress
Ability, significantly weakens destruction of the thermal stress to magnesia carbon brick body construction.Thus, tapping hole is resistance to obtained in this specific embodiment
Fiery material has excellent thermal shock resistance.
This specific embodiment also coats glaze slip coating using in magnesia carbon brick body surface, and the glaze slip coating is on 900 DEG C of left sides
The right side starts to soften and seal magnesia carbon brick body surface major part pore, and oxygen of the magnesia carbon brick body before tapping can be greatly reduced
Change；As the rising of temperature, the liquid phase in glaze slip coating are permeated toward magnesia carbon brick body interior, continue to protect in magnesia carbon brick body
Carbon is not oxidized；At the same time the SiO in glaze slip coating2、Cr2O3React etc. component and magnesia powder, increase magnesia carbon brick
The surface strength of body, not only increases the globality of magnesia carbon brick body, and improves the anti-molten steel of magnesia carbon brick body and wash away energy
Power.Because glaze slip coating is relatively thin, the later stage can repeatedly spray, to guarantee magnesia carbon brick body in carbon source aoxidize less as far as possible,
And the effect that carbon source resists thermal shock is given full play to, the steel heat that goes out of prepared converter taphole refractory material is 160 ~ 180
Stove, so as to significantly extend the tapping hole life-span.
Converter taphole refractory material obtained in this specific embodiment is after testing：Apparent porosity is 3.8 ~ 7.9%；Volume
Density is 2.65 ~ 3.07g/cm3；Strength at normal temperature reaches 14.6 ~ 23.6MPa；High temperature break resistant intensity is up to 16.1 ~ 24.7MPa；
Weight-loss ratio is 2.4 ~ 3.8% after the non-oxidizabilitys test of 2 hours under the conditions of 1400 DEG C of air atmospheres, thermal shock resistance and anti-
Erosion performance is excellent.
Therefore, this specific embodiment prepare converter taphole refractory material not only have excellent thermal shock resistance,
The characteristics of globality, non-oxidizability, corrosion resistance, and the characteristics of with life-span length.
Claims (9)
1. a kind of preparation method of converter taphole refractory material, it is characterised in that：One layer of glaze is sprayed in magnesia carbon brick body surface
Slurry, the coating layer thickness of the glaze slip is 1 ~ 2mm, is dried 12 ~ 24 hours under the conditions of 110 DEG C, is warming up to 240 DEG C, and insulation 24 is little
When, converter taphole refractory material is obtained；
The raw material and its content of the magnesia carbon brick body be：Fused magnesite particle is 55 ~ 72wt%, and magnesia powder is 7 ~ 20wt%,
Synthetic graphite particles be 1 ~ 5wt%, granulated graphite be 5 ~ 10wt%, expanded graphite be 0.2 ~ 2wt%, crystalline flake graphite fine powder be 2 ~
5wt%, aluminium powder is 1 ~ 3wt%, and silica flour is 1 ~ 2wt%, and phenolic resin is 2 ~ 4wt%；
By the magnesia carbon brick bulk stock and its content, by magnesia powder, crystalline flake graphite fine powder, expanded graphite, aluminium powder and silica flour
Mixed grind 1 ~ 5 minute, makes mixing fine powders in high speed kolleroang；Fused magnesite particle, synthetic graphite particles are placed in into kolleroang
Middle mixed grind 1 ~ 4 minute, adds phenolic resin mixed grind 3 ~ 6 minutes, adds 10 ~ 25 points of granulated graphite and the mixing fine powders mixed grind
Clock, ageing mixture 12 ~ 24 hours, isostatic pressing is placed 12 ~ 24 hours naturally, and magnesia carbon brick body is obtained；
The raw material and its content of the glaze slip be：Glass dust be 40 ~ 65wt%, spodumene be 5 ~ 25wt%, potassium feldspar be 10 ~
20wt%, silicon powder be 2 ~ 8wt%, potassium carbonate be 1 ~ 3wt%, SiC fine powders be 3 ~ 10wt%, chrome green be 1 ~ 3wt%, aluminium dihydrogen phosphate
For 1 ~ 3wt%；
By the glaze slip raw material and its content, the water for accounting for glaze slip raw material 40 ~ 70wt% of gross mass is added in the glaze slip raw material,
Altogether mill, obtains glaze slip.
2. the preparation method of converter taphole refractory material according to claim 1, it is characterised in that the fused magnesite
Content of MgO >=97% in particle；In fused magnesite particle：The fused magnesite particle of 1 ~ 3mm accounts for 25 ~ 45wt%, particle diameter less than 1mm and
Fused magnesite particle more than or equal to 0.1mm accounts for 55 ~ 75wt%.
3. the preparation method of converter taphole refractory material according to claim 1, it is characterised in that the fused magnesite
Content of MgO >=97% in fine powder, the particle diameter≤0.074mm of fused magnesite fine powder.
4. the preparation method of converter taphole refractory material according to claim 1, it is characterised in that the Delanium
Grain diameter is 0.1 ~ 1mm, and the granulated graphite particle diameter is 0.5 ~ 0.1mm, the crystalline flake graphite particle diameter≤0.074mm.
5. the preparation method of converter taphole refractory material according to claim 1, it is characterised in that the aluminium powder particle diameter
For≤0.045mm.
6. the preparation method of converter taphole refractory material according to claim 1, it is characterised in that the silica flour particle diameter
For≤0.088mm.
7. the preparation method of converter taphole refractory material according to claim 1, it is characterised in that the granulated graphite
Particle diameter is 0.1 ~ 0.5mm, and content of graphite is 32 ~ 37wt%.
8. the preparation method of converter taphole refractory material according to claim 1, it is characterised in that the phenolic resin
For one or more of liquid thermoset phenol-formaldehyde resin powder and liquid thermoplastic's phenolic resin.
9. a kind of converter taphole refractory material, it is characterised in that the converter taphole refractory material be according to claim 1 ~
Converter taphole refractory material any one of 8 prepared by the preparation method of converter taphole refractory material.
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| CN114105655B (en) * | 2021-11-17 | 2023-02-14 | 广东邦普循环科技有限公司 | Method for preparing refractory material by using waste battery waste residues and application of refractory material |
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