CN104402469A - Electric furnace top central area furnace cover and preparation method thereof - Google Patents

Electric furnace top central area furnace cover and preparation method thereof Download PDF

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Publication number
CN104402469A
CN104402469A CN201410640850.8A CN201410640850A CN104402469A CN 104402469 A CN104402469 A CN 104402469A CN 201410640850 A CN201410640850 A CN 201410640850A CN 104402469 A CN104402469 A CN 104402469A
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Prior art keywords
electric furnace
particle
furnace top
grade
bell
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CN201410640850.8A
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Chinese (zh)
Inventor
赵冉
万小宝
刘丽
任林
胡玲军
刘全超
王晓东
刘美荣
车晓梅
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Beijing Lier High Temperature Materials Co Ltd
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Beijing Lier High Temperature Materials Co Ltd
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Priority to CN201410640850.8A priority Critical patent/CN104402469A/en
Publication of CN104402469A publication Critical patent/CN104402469A/en
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Abstract

The invention provides an electric furnace top central area furnace cover and a preparation method thereof, the electric furnace top central area furnace cover comprises the following components by weight: 50-60% of aggregate, 25.6-27.6% co-ground powder, 5% of calcium aluminate cement and 2.5% of steel fiber. During the preparation, the co-ground powder and bone powder particles are mixed for 3 minutes, then the calcium aluminate cement and steel fiber are added for mixing for 8-10 minutes, and the premix is discharged; 5%-5.3% of water is added into the premix for stirring for about 3 minutes, after pre vibrating for 1 minute, the mixture is added into a mold, a lower vibration table is used to ensure sufficient air exhaust and smooth surface; thereafter, room temperature curing is performed for 1 day, then demoulding is performed, after demoulding, the curing is continued for 3 days; after baking, inspection, packaging and storage are performed. The electric furnace top central area furnace cover has good molten iron, molten iron slag and molten steel slag erosion resistance, has good thermal shock stability and high temperature sintering performance, and can reduce spalling and melting corrosion damage in the course of use.

Description

A kind of central section, electric furnace top bell and preparation method thereof
Technical field
The present invention relates to the resistance to material technology in electric furnace furnace roof central section, refer to central section, a kind of electric furnace top bell and preparation method thereof especially.
Background technology
50 ~ seventies of 20th century, the resistance to material in electric furnace furnace roof central section mainly uses silica brick to build by laying bricks or stones, under Electric furnace steel making condition in early days, silica brick has a lot of advantages, such as light-high-strength, and creep speed is low, good thermal shock stability, price is low, obtains to stablize to apply widely.Along with the continuous progress of Electric Furnace Steelmaking, Electric furnace steel making intensity increases, smelting temperature constantly raises, silica brick originally can not meet the needs of physical condition, therefore there is a series of high-alumina refractory brick or the refractory castable such as mullite, high alumina spinel, high alumina refractories refractoriness is higher, can meet the requirement of superpower Electric furnace steel making, goes so far as now.
But nearly 2 years Electric furnace steel makings occur being blended into the ever-increasing phenomenon of iron water amount, the increase of molten iron additional proportion and the fluctuation of molten steel quality larger, enlarge markedly to the impact of the resistance to material of electric furnace furnace roof, the work-ing life of the resistance to material of furnace roof obviously declines, such as be blended into molten iron proportion in certain steel mill and be less than 40%, the resistance to material life-span reaches more than 300 stoves, when molten iron proportion is increased to 50% ~ 70%, life-span obviously declines, minimum only have 40 stoves about.For this situation, Chinese patent 200710052641.1 discloses a kind of high-alumina electric furnace cover pouring material and preparation method thereof, aluminium content 75 ~ 90WT%, kyanite 3 ~ 15WT%, builds shaping by aluminate cement and silicon-aluminum sol combination.Chinese patent 200710052640.7 announces a kind of aluminum oxide electric furnace cover pouring material and preparation method thereof, main employing white fused alumina, alumine, the aggregates such as zircon corundum and kyanite fine powder, aluminum oxide fine powder etc. are built shaping by aluminous cement and silicon-aluminum sol combination.In literature etc., " improving the research in furnace lid life-span under high hot metal ratio condition ", (Laigang is scientific and technological, 2012, propose 2:6-8) molten iron be blended into the high influence factor to the bell life-span of ratio as oxygen supply intensity is large, bell radiating condition is poor, dust-removal system fault etc. take corresponding process optimization and innovative approach, improve the work-ing life of small furnace cover of electric furnace.Chen Yang etc. are at " high molten iron is blended into the development than furnace lid magnesium aluminum spinel pouring material " (refractory materials, 2012,46 (5): 358-360) be blended into for high agio in and carry out comparative study than making magnesium-aluminium spinel matter mould material and aluminous cement combined high-aluminium mould material.
Summary of the invention
The present invention proposes central section, a kind of electric furnace top bell and preparation method thereof, solves existing Electric furnace steel making molten iron and is blended into ratio and improves constantly, and oxygen blast intensity increases, and causes the technical problem of electric furnace cover service life reduction.
Technical scheme of the present invention is achieved in that
A kind of central section, electric furnace top bell, comprises the component of following weight percent: 88 homogenizing alumina particles 10%, electric smelting low-carbon (LC) Brown Alundum particle 25 ~ 28%, electrofused mullite particle 12 ~ 15%, andaluzite particle 15%, fused white corundum fine powder 10 ~ 15%, silicon powder 4 ~ 8%, α-Al 2o 3micro mist 4%, chromic oxide 3%, explosion-proof fiber 0.1%, water reducer 0.5%, aluminous cement 5% and steel fiber 2.5%.
Preferably, electric smelting low-carbon (LC) Brown Alundum particle, comprises the component of following weight percent: the electric smelting low-carbon (LC) Brown Alundum 15 ~ 16% of grade to be the electric smelting low-carbon (LC) Brown Alundum 10 ~ 12% of 8 ~ 5mm and grade be 5 ~ 3mm.
Preferably, the grade of 88 homogenizing alumina particles is 15 ~ 8mm, and chemical constitution weight percent is respectively: Al 2o 3>=88.0, Fe 2o 3≤ 1.55, TiO 2: 2.0 ~ 4.0, SiO 2: 5.0 ~ 6.5.
Preferably, the grade of electrofused mullite particle is 3 ~ 1mm, and chemical composition weight percent is respectively: Al 2o 3>=70.0, SiO 2: 22 ~ 24.5, Fe 2o 3≤ 0.5.
Preferably, the grade of andaluzite particle is 1 ~ 0mm; Chemical composition weight percent is respectively: Al 2o 3>=58.5, SiO 2: 38 ~ 40.0, TiO 2≤ 0.4, Fe 2o 3≤ 1.0.
A preparation method for central section, electric furnace top bell, comprises the following steps:
The first step, system material: first by fused white corundum fine powder, silicon powder, α-Al 2o 3micro mist, chromic oxide, explosion-proof fiber and water reducer ADS3, mix, and makes common abrasive dust; By 88 homogenizing alumina particles, electric smelting low-carbon (LC) Brown Alundum particle, electrofused mullite particle and and andaluzite particle mix, make bone meal by high speed mixing pan;
Second step, Preblend: abrasive dust, bone meal particle batch mixing 3 minutes will be total to, then add aluminous cement and steel fiber, wherein steel fiber evenly will scatter and add, and mixes discharging after 8 ~ 10 minutes;
3rd step, shaping: Preblend to be added water 5.0% ~ 5.3%, stir about 3 minutes, then first pre-shock adds mould for 1 minute and adopts bottom bumper, and top especially central zone uses vibrating head simultaneously, guarantees that exhaust is fully, surfacing;
4th step, maintenance: in above-mentioned forming operation, stirrer and bumper are determined according to actual product size, needs normal temperature maintenance demoulding after 1 day, continues maintenance 3 days after the demoulding;
5th step, baking: entering kilneye temperature must not higher than 60 DEG C, and baking time more than 92 hours, the highest storing temperature is 350 DEG C ~ 600 DEG C, tests, packs and put in storage after having toasted.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only that principle of the present invention is described, for those of ordinary skill in the art, under the prerequisite not paying creative work, the principle of work of this patent is had gained some understanding.
Fig. 1 adopts by the embodiment of the present invention grain type and the per-cent comparison diagram of batching;
Fig. 2 is process flow sheet of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the know-why in the embodiment of the present invention is clearly and completely described.Based on the know-why in the present invention, those of ordinary skill in the art, not making the every other embodiment based on this know-why obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, central section, a kind of electric furnace top of the present invention bell, comprises the component of following weight percent: the aggregate of 65%, the common abrasive dust of 25.6 ~ 26.6%, 5% aluminous cement and 2.5% steel fiber.Aggregate comprises the component of following weight percent: the 88 homogenizing alumina particles of 10%, the electric smelting low-carbon (LC) Brown Alundum particle of 25 ~ 28%, the electrofused mullite particle of 12 ~ 15% and the andaluzite particle of 15%, abrasive dust comprises the component of following weight percent altogether: the fused white corundum fine powder of 10 ~ 15%, the α-Al of 4% 2o 3micro mist, the silicon powder of 4 ~ 8%, the chromic oxide of 3% and the explosion-proof fiber of 0.1% and 0.5% water reducer.
Embodiment one:
Central section, a kind of electric furnace top bell of the embodiment of the present invention one, comprise the component of following weight percent: the 88 homogenizing alumina particles of 10%, its grade is 15 ~ 8mm, and its chemical constitution per-cent is: Al 2o 3>=88.0, Fe 2o 3≤ 1.55, TiO 2: 2.0 ~ 4.0, SiO 2: 5.0 ~ 6.5; Electric smelting low-carbon (LC) Brown Alundum, its grade has two kinds: 8 ~ 5mm and 5 ~ 3mm; Grade to be the electric smelting low-carbon (LC) Brown Alundum weight ratio of 8 ~ 5mm be 12% and grade be the electric smelting low-carbon (LC) Brown Alundum weight ratio of 5 ~ 3mm be 16%, the mass percent of its chemical composition is: Al 2o 3>=96.0, TiO 2: 2.0 ~ 2.3, SiO 2≤ 0.8, Fe 2o 3≤ 0.1, Na 2o+K 2o≤0.2, Pulverization ratio≤0.01%; The electrofused mullite particle of 12%, grade is 3 ~ 1mm, and the mass percent of its chemical composition is: Al 2o 3>=70.0, SiO 2: 22 ~ 24.5, Fe 2o 3≤ 0.5; The andaluzite particle of 15%, its grade is 1 ~ 0mm; The mass percent of its chemical composition is respectively: Al 2o 3>=58.5, SiO 2: 38 ~ 40.0, TiO 2≤ 0.4, Fe 2o 3≤ 1.0; The fused white corundum fine powder of 15%, grade is 200 orders, and the component comprised and weight percent are: Al 2o 3>=99.0, SiO 2≤ 0.4, Na 2o+K 2o≤0.5; The silicon powder of 4%; The mass percent of its chemical composition is: SiO 2>=96.0%; α-the Al of 4% 2o 3micro mist, grade is≤5 μm, wherein α-Al 2o 3powder size distribution curve is two peak structure; The chromic oxide of 3%, grade is 320 orders; The explosion-proof fiber of 0.1%, explosion-proof fiber granularity is 4mm, aqueous fusion property, and melt temperature is 70 DEG C ~ 80 DEG C; The water reducer ADS3 of 0.5%; The aluminous cement of 5%, the mass percent of its chemical composition is respectively: Al 2o 3>=71.0; The steel fiber of 2.5%, grade is 40mm, and be high temperature steel 304 fiber, size model is 30 ~ 40mm.
Embodiment two:
Central section, a kind of electric furnace top bell of the embodiment of the present invention two, comprise the component of following weight percent: the 88 homogenizing alumina particles of 10%, its grade is 15 ~ 8mm, and its chemical constitution per-cent is: Al 2o 3>=88.0, Fe 2o 3≤ 1.55, TiO 2: 2.0 ~ 4.0, SiO 2: 5.0 ~ 6.5; The electric smelting low-carbon (LC) Brown Alundum of 25%, its grade has two kinds: 8 ~ 5mm and 5 ~ 3mm; The mass percent of its chemical composition is: Al 2o 3>=96.0, TiO 2: 2.0 ~ 2.3, SiO 2≤ 0.8, Fe 2o 3≤ 0.1, Na 2o+K 2o≤0.2, Pulverization ratio≤0.01%; The electrofused mullite particle of 15%, grade is 3 ~ 1mm, and the mass percent of its chemical composition is: Al 2o 3>=70.0, SiO 2: 22 ~ 24.5, Fe 2o 3≤ 0.5; The andaluzite particle of 15%, its grade is 1 ~ 0mm; The mass percent of its chemical composition is respectively: Al 2o 3>=58.5, SiO 2: 38 ~ 40.0, TiO 2≤ 0.4, Fe 2o 3≤ 1.0; The fused white corundum fine powder of 15%, grade is 200 orders, and the component comprised and weight percent are: Al 2o 3>=99.0, SiO 2≤ 0.4, Na 2o+K 2o≤0.5; The silicon powder of 8%; The mass percent of its chemical composition is: SiO 2>=96.0%; α-the Al of 4% 2o 3micro mist, grade is≤5 μm, wherein α-Al 2o 3powder size distribution curve is two peak structure; The chromic oxide of 3%, grade is 320 orders; The explosion-proof fiber of 0.1%, explosion-proof fiber granularity is 4mm, aqueous fusion property, and melt temperature is 70 DEG C ~ 80 DEG C; The water reducer ADS3 of 0.5%; The aluminous cement of 5%, the mass percent of its chemical composition is respectively: Al 2o 3>=71.0; The steel fiber of 2.5%, grade is 40mm, and be high temperature steel 304 fiber, size model is 30 ~ 40mm.
As shown in Figure 2, the present invention also provides the preparation method of central section, a kind of electric furnace top bell, specifically comprises the following steps:
The first step: system material, according to the weight percent proportioning of central section, above-mentioned electric furnace top bell, first by fused white corundum fine powder, silicon powder, α-Al 2o 3micro mist, chromic oxide, explosion-proof fiber and water reducer ADS3, mix, and makes common abrasive dust; By homogenizing alumina particle, electric smelting low-carbon (LC) Brown Alundum particle, electrofused mullite particle and and andaluzite particle mix, make bone meal; Mixing equipment is high speed mixing pan.
Second step: Preblend, when producing, first will be total to abrasive dust, bone meal particle batch mixing 3 minutes, and then add aluminous cement and steel fiber, wherein steel fiber evenly will scatter and add, and mixes discharging after 8 ~ 10 minutes.
3rd step: shaping, adds water 5.0% ~ 5.3% by Preblend during production, stir about 3 minutes, and then first pre-shock adds mould for 1 minute and adopt bottom bumper, and top especially central zone uses vibrating head simultaneously, guarantees that exhaust fully, surfacing.Then maintenance is toasted.
4th step: maintenance, above-mentioned shaping stirrer and bumper are determined according to actual product size; , need normal temperature maintenance demoulding after 1 day, continue maintenance after the demoulding 3 days;
5th step: baking, entering kilneye temperature must not higher than 60 DEG C, and baking time more than 92 hours, the highest storing temperature is 350 DEG C ~ 600 DEG C, tests, packs and put in storage after having toasted.
The main physical and chemical index of low-carbon corundum spinelle brick of the present invention is as follows: Al 2o 3>=70%, SiO 2≤ 20%.200 DEG C are dried rear volume density>=2.8g/cm 3, apparent porosity (110 DEG C × 24h)≤18%, compressive strength (110 DEG C × 24h)>=80MPa, Linear change rate (1500 DEG C × 3h)-0.8 ~+0.5%.This product is tried out through 150 tons of electric furnaces, molten iron proportion 50%, work-ing life >=160 times, in use good stability, this product uses through 50 tons of electric furnaces, molten iron proportion > 70%, more than work-ing life 80 stove.
The present invention is by electrofused mullite and andaluzite particle, and under making high temperature, even in liquid phase is distributed in goods, promotes high temperature sintering on the one hand, improves hot strength, thus has good scour resistance; On the other hand the existence of a certain amount of liquid phase can significantly improve the thermal shock resistance of goods, and what prevent thermal shock effect from causing product peels off damage.Andaluzite starts to be decomposed into mullite phase and liquid phase with volumetric expansion at about 1400 DEG C, just in time makes up other raw materials at this temperature and starts to sinter the volumetric shrinkage caused, make goods have good volume stability.The adding of aluminum oxide fine powder in matrix, according to phase diagram theory analysis, Al suitable in matrix 2o 3/siO 2ratio can promote that goods and molten iron or scum react and produce CaO6Al 2o 3and FeOAl 2o 3spinel, is conducive to opposing slag penetration and corrodes internal refractories.Add light-burned α-Al 2o 3micro mist, two peak structure improves fillibility between mould material mobility and raw material on the one hand, is conducive to reducing amount of water and improving goods densification; Light-burned micro mist has higher activity on the other hand, is conducive to promoting that high temperature sintering produces hot strength.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (6)

1. central section, electric furnace top bell, it is characterized in that, comprise the component of following weight percent: 88 homogenizing alumina particles 10%, electric smelting low-carbon (LC) Brown Alundum particle 25 ~ 28%, electrofused mullite particle 12 ~ 15%, andaluzite particle 15%, fused white corundum fine powder 10 ~ 15%, silicon powder 4 ~ 8%, α-Al 2o 3micro mist 4%, chromic oxide 3%, explosion-proof fiber 0.1%, water reducer 0.5%, aluminous cement 5% and steel fiber 2.5%.
2. central section, electric furnace top according to claim 2 bell, it is characterized in that, described electric smelting low-carbon (LC) Brown Alundum particle, comprises the component of following weight percent: the electric smelting low-carbon (LC) Brown Alundum 15 ~ 16% of grade to be the electric smelting low-carbon (LC) Brown Alundum 10 ~ 12% of 8 ~ 5mm and grade be 5 ~ 3mm.
3. central section, electric furnace top according to claim 1 bell, is characterized in that, the grade of described 88 homogenizing alumina particles is 15 ~ 8mm, and chemical constitution weight percent is respectively: Al 2o 3>=88.0, Fe 2o 3≤ 1.55, TiO 2: 2.0 ~ 4.0, SiO 2: 5.0 ~ 6.5.
4. central section, electric furnace top according to claim 1 bell, is characterized in that, the grade of described electrofused mullite particle is 3 ~ 1mm, and chemical composition weight percent is respectively: Al 2o 3>=70.0, SiO 2: 22 ~ 24.5, Fe 2o 3≤ 0.5.
5. central section, electric furnace top according to claim 1 bell, is characterized in that, the grade of described andaluzite particle is 1 ~ 0mm; Chemical composition weight percent is respectively: Al 2o 3>=58.5, SiO 2: 38 ~ 40.0, TiO 2≤ 0.4, Fe 2o 3≤ 1.0.
6. a preparation method for central section, electric furnace top bell, is characterized in that, comprise the following steps:
The first step, system material: first by fused white corundum fine powder, silicon powder, α-Al 2o 3micro mist, chromic oxide, explosion-proof fiber and water reducer ADS3, mix, and makes common abrasive dust; By 88 homogenizing alumina particles, electric smelting low-carbon (LC) Brown Alundum particle, electrofused mullite particle and and andaluzite particle mix, make bone meal by high speed mixing pan;
Second step, Preblend: abrasive dust, bone meal particle batch mixing 3 minutes will be total to, then add aluminous cement and steel fiber, wherein steel fiber evenly will scatter and add, and mixes discharging after 8 ~ 10 minutes;
3rd step, shaping: Preblend to be added water 5.0% ~ 5.3%, stir about 3 minutes, then first pre-shock adds mould for 1 minute and adopts bottom bumper, and top especially central zone uses vibrating head simultaneously, guarantees that exhaust is fully, surfacing;
4th step, maintenance: in above-mentioned forming operation, stirrer and bumper are determined according to actual product size, needs normal temperature maintenance demoulding after 1 day, continues maintenance 3 days after the demoulding;
5th step, baking: entering kilneye temperature must not higher than 60 DEG C, and baking time more than 92 hours, the highest storing temperature is 350 DEG C ~ 600 DEG C, tests, packs and put in storage after having toasted.
CN201410640850.8A 2014-11-13 2014-11-13 Electric furnace top central area furnace cover and preparation method thereof Pending CN104402469A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105777157A (en) * 2016-03-15 2016-07-20 北京利尔高温材料股份有限公司 Integral furnace cover for central region of roof of LF refining furnace and manufacturing method of integral furnace cover
CN105819871A (en) * 2016-03-15 2016-08-03 北京利尔高温材料股份有限公司 Air blowing and slag removing spray gun for foundry ladle and preparation method thereof
CN105859264A (en) * 2016-05-17 2016-08-17 四川省江油百胜耐火材料有限责任公司 Compact-corundum head cover for electric furnace and preparation method thereof
CN106995310A (en) * 2017-03-17 2017-08-01 周九喜 A kind of wear-resisting high-strength degree aluminum electric furnace cover and preparation method thereof
CN107434387A (en) * 2017-08-07 2017-12-05 北京东峰兴达耐火材料有限公司 Explosion-proof heat resistance concrete
CN111732422A (en) * 2020-05-29 2020-10-02 郑州安耐克实业有限公司 Electric furnace roof prefabricated part with strong thermal shock resistance and preparation process thereof
CN112521167A (en) * 2020-12-08 2021-03-19 洛阳科创新材料股份有限公司 Chrome corundum spinel tapping hole head brick for eccentric electric furnace and preparation method thereof
CN113623999A (en) * 2021-08-05 2021-11-09 南京玄浦冶金技术有限公司 Fire-resistant protection box and preparation method thereof
CN115108843A (en) * 2022-06-27 2022-09-27 山西禄纬堡太钢耐火材料有限公司 Long-life anti-stripping 90t electric arc furnace top mullite prefabricated member and preparation method thereof

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105777157A (en) * 2016-03-15 2016-07-20 北京利尔高温材料股份有限公司 Integral furnace cover for central region of roof of LF refining furnace and manufacturing method of integral furnace cover
CN105819871A (en) * 2016-03-15 2016-08-03 北京利尔高温材料股份有限公司 Air blowing and slag removing spray gun for foundry ladle and preparation method thereof
CN105859264A (en) * 2016-05-17 2016-08-17 四川省江油百胜耐火材料有限责任公司 Compact-corundum head cover for electric furnace and preparation method thereof
CN106995310A (en) * 2017-03-17 2017-08-01 周九喜 A kind of wear-resisting high-strength degree aluminum electric furnace cover and preparation method thereof
CN107434387A (en) * 2017-08-07 2017-12-05 北京东峰兴达耐火材料有限公司 Explosion-proof heat resistance concrete
CN107434387B (en) * 2017-08-07 2019-11-05 北京东峰兴达耐火材料有限公司 Explosion-proof heat resistance concrete
CN111732422A (en) * 2020-05-29 2020-10-02 郑州安耐克实业有限公司 Electric furnace roof prefabricated part with strong thermal shock resistance and preparation process thereof
CN112521167A (en) * 2020-12-08 2021-03-19 洛阳科创新材料股份有限公司 Chrome corundum spinel tapping hole head brick for eccentric electric furnace and preparation method thereof
CN113623999A (en) * 2021-08-05 2021-11-09 南京玄浦冶金技术有限公司 Fire-resistant protection box and preparation method thereof
CN113623999B (en) * 2021-08-05 2022-08-09 南京玄浦冶金技术有限公司 Fire-resistant protection box and preparation method thereof
CN115108843A (en) * 2022-06-27 2022-09-27 山西禄纬堡太钢耐火材料有限公司 Long-life anti-stripping 90t electric arc furnace top mullite prefabricated member and preparation method thereof
CN115108843B (en) * 2022-06-27 2023-09-26 山西禄纬堡太钢耐火材料有限公司 Long-life spalling-resistant 90t arc furnace roof mullite prefabricated part and preparation method thereof

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