CN103787668A - Preparation method of carbon-free slag line brick used for ladle - Google Patents
Preparation method of carbon-free slag line brick used for ladle Download PDFInfo
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- CN103787668A CN103787668A CN201210433474.6A CN201210433474A CN103787668A CN 103787668 A CN103787668 A CN 103787668A CN 201210433474 A CN201210433474 A CN 201210433474A CN 103787668 A CN103787668 A CN 103787668A
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Abstract
The invention discloses a preparation method of a carbon-free slag line brick used for a ladle. The method includes: placing 30-34 parts of 1-3mm fused mullite particles, 22-24 parts of 1-3mm fused spinel particles, and 12-14 parts of 1-3mm fused magnesia particles into an edge runner mill to mix them for 10-20min; adding a water glass solution with a density of 1.2g/cm<3> and conducting mixing for 15-25min; adding 8-12 parts of fused magnesia fine powder with a particle size of -150 meshes, 3-5 parts of brown fused alumina with a particle size of -200 meshes, 1-3 parts of chromium oxide fine powder with a particle size of -200 meshes, 0.5-1.5 parts of metal aluminum powder with a particle size of -200 meshes, and 1-2 parts of boron nitride with a particle size of -200 meshes, then conducting mixing for 10-20min; adding a 8wt% polyvinyl alcohol solution, then performing mixing for 15-25min, and then conducting material storing at 20DEG C for 12-24h; and carrying out molding by a press machine under a molding pressure of 150-200MPa; and performing baking at 190-210DEG C for 24h, thus obtaining the carbon-free slag line brick.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, relate in particular to a kind of preparation method of steel non-carbon residue feather edge slag line brick.
Background technology
At present, be mostly magnesia carbon brick for the ladle liner brick of steel smelting procedure, be all take magnesia and crystalline flake graphite as body material, add some antioxidants, with resin be bonding agent, through mixing and high-pressure molding is suppressed the not burned product forming.This carbonaceous material, because the good resistance to fouling of spalling resistance is strong, plays an important role within the quite a long time always.But along with the sharply increase of China to various fine steel grade demands, metallurgy industry to various refractory materialss the carburetting to steel in metallurgical technology process further pay attention to, be badly in need of solving smelting low carbon steel, particularly when high-quality stainless steel carbon containing refractory to molten steel recarburization problem, use the ladle of common magnesia carbon brick (carbon content 15%) in stainless steel smelting process, to approach 50ppm left and right from AOD to strand molten steel recarburization, use the ladle carburetting of carbon content 6% to approach 40ppm left and right.The carburetting of carbon containing refractory to molten steel in subsequent smelting process, almost exhausts ultra low-carbon steel smelting decarburization effect in earlier stage.In order to address the above problem, within 2005, species abundance in Baosteel in Shanghai iron and steel share has been announced MgO >=85%, the low carbon magnesia carbon brick of C≤5%, and the magnesia carbon brick use properties of this technology is suitable with the magnesia carbon brick performance of MT-14A; Shanghai special bonding agent and the additive of Peng Pu refractory materials station-service made MgO >=90%, the ultralow carbon brick of C≤2%; Iron and Steel Research Geueral Inst is by using trickle graphite to make the low carbon magnesia carbon brick of C≤5%; Jinan magnesia carbon brick station-service low bulk graphite and common graphite, add Al, Si alloy, made the low carbon magnesia carbon brick of C3%-8%, uses in addition Ti-C to make the report of ultralow carbon brick.Goods or carbon content higher (>=3%) that above method makes, molten steel is also had to obvious recarburization, or used special material (as: extraordinary bonding agent, Ti-C etc.) to make complex manufacturing, production cost higher.
Such as car panel steel, the exploitation of the special steels such as high-quality pipe line steel and nonmagnetic steel, has proposed strict control requirement to the carbon content of refining ladle working lining (slag line and molten bath) refractory materials.At present, when the variety steels such as smelting low carbon steel and ultra low-carbon steel, generally adopt the working lining material of AluminaSpinel Bricks as bottom of steel ladle and bag wall, substitute traditional Al2O3MgOC Bricks and magnesia carbon brick, control the carburetting of Refractory on Molten Steel in ladle refining-transportation; And the slag lining of this type of refining ladle generally builds by laying bricks or stones and burn till magnesia chrome brick and magnesia alumina brick etc., owing to being subject to erosion and the thermal shock repeatedly of high low temperature of high-temperature alkaline slag, its work-ing life is very low, far can not synchronize with the work-ing life of other position refractory linings of ladle.Most of steel mills adopt magnesia carbon brick (carbon content 14～18%) or low carbon magnesia carbon brick (carbon content is about 5%) as slag line working lining, but in smelting process, the carburetting problem of molten steel are remained the bottleneck of restriction ultra low-carbon steel smelting technology.
Therefore, completely carbon-free slag line working lining refractory materials of exploitation, improves its thermal shock resistance and is the carbon-free ladle slag line of the raising important channel in work-ing life to the adaptive faculty of acid-basicity slag.
Summary of the invention
The object of the invention is to propose a kind of preparation method of steel non-carbon residue feather edge slag line brick, carbon containing not in slag line brick prepared by the method, thereby fundamentally solve the carburetting problem causing because of slag line brick, this ladle slag line brick is suitable for car panel steel, the smelting of the special steels such as high-quality pipe line steel and nonmagnetic steel.
For achieving the above object, the technical solution used in the present invention is:
A kind of preparation method of steel non-carbon residue feather edge slag line brick, the raw material of described carbon-free slag line brick is made up of following component in weight part: 1-3mm electrofused mullite particle 30-34 part, 1-3mm electric smelting spinel particle 22-24 part, 1-3mm electrosmelted magnesite clinker particle 12-14 part ,-150 order electrosmelted magnesite clinker fine powder 8-12 parts ,-200 order palm fibre corundum 3-5 parts,-200 order chromic oxide fine powder 1-3 parts,-200 order metallic aluminium powder 0.5-1.5 parts ,-200 order boron nitride 1-2 parts, density 1.2g/cm
3water glass solution 3.5-4.5 part, polyvinyl alcohol solution 2.5-3.5 part that concentration is 8wt%; Described preparation method is: electrofused mullite particle, electric smelting spinel particle, electrosmelted magnesite clinker particle are put into wheel roller mixing 10-20 minute; After adding water glass solution, mix 15-25 minute; After adding electrosmelted magnesite clinker fine powder, brown corundum, chromic oxide fine powder, metallic aluminium powder, boron nitride, mix 10-20 minute; Add polyvinyl alcohol solution remix 15-25 minute, mixing evenly after discharging, sincere material 12-24 hour at 20 ℃; Use pressing machine moulding, forming pressure 150-200MPa; After 190-210 ℃ of baking 24h, obtain carbon-free slag line brick.
Adopt electrofused mullite, electric smelting spinel and electrosmelted magnesite clinker particle as aggregate, guarantee the intensity of slag line brick and improve antistrip performance, and improving resistance to elevated temperatures.
In the carbon-free slag line brick of the present invention, add brown corundum, in order to reduce void content and reinforcement matrix, improve compressive strength after the baking of carbon-free slag line brick, in use procedure, it reacts original position generation aluminum-spinel with the electrosmelted magnesite clinker fine powder in matrix at the scene, bring uniform expansion and in matrix, produce tiny crack toughening effect, having improved antistripping and the thermal shock resistance of carbon-free slag line brick;
Add and have chromic oxide, in use procedure, be solid-solubilized in spinel, more effectively absorb the oxide compounds such as FeO in slag and form composite spinelle, increased the viscosity of carbon-free slag line brick and slag interface liquid phase, be easy to produce dross layer, thus raising slag penetration resistance; Generated in-situ spinel structure uniform particles, the little activity of particle diameter are high, can solid solution slag in most oxide compound, can adapt to the characteristic that the basicity of slag in steelmaking process changes;
Add and have metallic aluminium powder, in use generate oxide compound, the conjunctive tissue of strengthening matrix, reduces the void content of carbon-free slag line brick and improves hot strength, increases the viscosity of carbon-free slag line brick and slag interface liquid phase, stops the infiltration of slag; Described metallic aluminium powder is oxidized the volumetric expansion bringing in matrix, significantly improves the thermal shock resistance of carbon-free slag line brick;
Add and have boron nitride, produce liquid phase with other substance reactions in matrix, thereby regulate the volume change of goods and improve antistripping.
Adopt the organic and compound mode adding of inorganic bonding agent, improve green strength and the volume density of slag line brick, the medium temperature intensity of stable article, controls low melting component and amount of liquid phase, thereby guarantees the high-temperature behavior of carbon-free slag line brick.
Beneficial effect of the present invention is:
1) form in the component of slag line brick not carbon containing, therefore fundamentally solved the problem of the carburetting that slag line brick causes.
2) adopt electrofused mullite, electric smelting spinel and electrosmelted magnesite clinker particle as aggregate, guarantee the intensity of slag line brick and improve antistrip performance, and improving resistance to elevated temperatures.
3) by electrosmelted magnesite clinker fine powder, brown corundum, chromic oxide fine powder, metallic aluminium powder, the combination of boron nitride component and the collocation of content, between each component, reach coordination technique effect, make slag line brick have advantages of that high, the unburned one-tenth of green strength, good thermal shock stability and anti acid alkali performance slag corrosion ability are strong.
Embodiment
Embodiment mono-
A kind of preparation method of steel non-carbon residue feather edge slag line brick, the raw material of described carbon-free slag line brick is made up of following component in weight part: 30 parts of 1-3mm electrofused mullite particles, 24 parts of 1-3mm electric smelting spinel particles, 12 parts of 1-3mm electrosmelted magnesite clinker particles,-150 12 parts of order electrosmelted magnesite clinker fine powders,-200 3 parts, order palm fibre corundum,-200 3 parts of order chromic oxide fine powders,-200 0.5 part of order metallic aluminium powder,-200 2 parts of order boron nitride, 3.5 parts of the water glass solutions of density 1.2g/cm3,3.5 parts of the polyvinyl alcohol solutions that concentration is 8wt%; Described preparation method is: electrofused mullite particle, electric smelting spinel particle, electrosmelted magnesite clinker particle are put into wheel roller and mix 10 minutes; After adding water glass solution, mix 25 minutes; After adding electrosmelted magnesite clinker fine powder, brown corundum, chromic oxide fine powder, metallic aluminium powder, boron nitride, mix 10 minutes; Add polyvinyl alcohol solution remix 25 minutes, mixing evenly after discharging, sincere material 12 hours at 20 ℃; Use pressing machine moulding, forming pressure 200MPa; After 190 ℃ of baking 24h, obtain carbon-free slag line brick.
Embodiment bis-
A kind of preparation method of steel non-carbon residue feather edge slag line brick, the raw material of described carbon-free slag line brick is made up of following component in weight part: 34 parts of 1-3mm electrofused mullite particles, 22 parts of 1-3mm electric smelting spinel particles, 14 parts of 1-3mm electrosmelted magnesite clinker particles,-150 8 parts of order electrosmelted magnesite clinker fine powders,-200 5 parts, order palm fibre corundum,-200 1 part of order chromic oxide fine powder,-200 1.5 parts of order metallic aluminium powders,-200 1 part of order boron nitride, 4.5 parts of the water glass solutions of density 1.2g/cm3,2.5 parts of the polyvinyl alcohol solutions that concentration is 8wt%; Described preparation method is: electrofused mullite particle, electric smelting spinel particle, electrosmelted magnesite clinker particle are put into wheel roller and mix 20 minutes; After adding water glass solution, mix 15 minutes; After adding electrosmelted magnesite clinker fine powder, brown corundum, chromic oxide fine powder, metallic aluminium powder, boron nitride, mix 20 minutes; Add polyvinyl alcohol solution remix 15 minutes, mixing evenly after discharging, sincere material 24 hours at 20 ℃; Use pressing machine moulding, forming pressure 150MPa; After 210 ℃ of baking 24h, obtain carbon-free slag line brick.
Embodiment tri-
A kind of preparation method of steel non-carbon residue feather edge slag line brick, the raw material of described carbon-free slag line brick is made up of following component in weight part: 32 parts of 1-3mm electrofused mullite particles, 23 parts of 1-3mm electric smelting spinel particles, 13 parts of 1-3mm electrosmelted magnesite clinker particles,-150 10 parts of order electrosmelted magnesite clinker fine powders,-200 4 parts, order palm fibre corundum,-200 2 parts of order chromic oxide fine powders,-200 1 part of order metallic aluminium powder,-200 1.5 parts of order boron nitride, 4 parts of the water glass solutions of density 1.2g/cm3,3 parts of the polyvinyl alcohol solutions that concentration is 8wt%; Described preparation method is: electrofused mullite particle, electric smelting spinel particle, electrosmelted magnesite clinker particle are put into wheel roller and mix 15 minutes; After adding water glass solution, mix 20 minutes; After adding electrosmelted magnesite clinker fine powder, brown corundum, chromic oxide fine powder, metallic aluminium powder, boron nitride, mix 15 minutes; Add polyvinyl alcohol solution remix 20 minutes, mixing evenly after discharging, sincere material 18 hours at 20 ℃; Use pressing machine moulding, forming pressure 175MPa; After 200 ℃ of baking 24h, obtain carbon-free slag line brick.
Claims (1)
1. the preparation method of a steel non-carbon residue feather edge slag line brick, it is characterized in that, the raw material of described carbon-free slag line brick is made up of following component in weight part: 1-3mm electrofused mullite particle 30-34 part, 1-3mm electric smelting spinel particle 22-24 part, 1-3mm electrosmelted magnesite clinker particle 12-14 part,-150 order electrosmelted magnesite clinker fine powder 8-12 parts,-200 order palm fibre corundum 3-5 parts ,-200 order chromic oxide fine powder 1-3 parts ,-200 order metallic aluminium powder 0.5-1.5 parts,-200 order boron nitride 1-2 parts, density 1.2g/cm
3water glass solution 3.5-4.5 part, polyvinyl alcohol solution 2.5-3.5 part that concentration is 8wt%; Described preparation method is: electrofused mullite particle, electric smelting spinel particle, electrosmelted magnesite clinker particle are put into wheel roller mixing 10-20 minute; After adding water glass solution, mix 15-25 minute; After adding electrosmelted magnesite clinker fine powder, brown corundum, chromic oxide fine powder, metallic aluminium powder, boron nitride, mix 10-20 minute; Add polyvinyl alcohol solution remix 15-25 minute, mixing evenly after discharging, sincere material 12-24 hour at 20 ℃; Use pressing machine moulding, forming pressure 150-200MPa; After 190-210 ℃ of baking 24h, obtain carbon-free slag line brick.
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| CN201210433474.6A CN103787668A (en) | 2012-11-03 | 2012-11-03 | Preparation method of carbon-free slag line brick used for ladle |
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| CN201210433474.6A CN103787668A (en) | 2012-11-03 | 2012-11-03 | Preparation method of carbon-free slag line brick used for ladle |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104496493A (en) * | 2014-10-10 | 2015-04-08 | 长兴正发热电耐火材料有限公司 | High temperature-resistant composite magnesia-alumina unburned brick and preparation method thereof |
| CN105523749A (en) * | 2015-12-21 | 2016-04-27 | 江苏苏嘉集团新材料有限公司 | Magnesium boron brick and preparation method thereof |
| CN107602087A (en) * | 2017-10-21 | 2018-01-19 | 马小良 | A kind of fire resisting low carbon magnesia carbon brick |
| CN108395228A (en) * | 2018-03-22 | 2018-08-14 | 无锡市南方耐材有限公司 | Not oil immersion chromium magnalium is burnt into without carbonaceous sliding plate brick and preparation method thereof |
-
2012
- 2012-11-03 CN CN201210433474.6A patent/CN103787668A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104496493A (en) * | 2014-10-10 | 2015-04-08 | 长兴正发热电耐火材料有限公司 | High temperature-resistant composite magnesia-alumina unburned brick and preparation method thereof |
| CN104496493B (en) * | 2014-10-10 | 2016-02-17 | 长兴正发热电耐火材料有限公司 | A kind of high temp durable composite aluminum magnesium green brick and preparation method thereof |
| CN105523749A (en) * | 2015-12-21 | 2016-04-27 | 江苏苏嘉集团新材料有限公司 | Magnesium boron brick and preparation method thereof |
| CN107602087A (en) * | 2017-10-21 | 2018-01-19 | 马小良 | A kind of fire resisting low carbon magnesia carbon brick |
| CN108395228A (en) * | 2018-03-22 | 2018-08-14 | 无锡市南方耐材有限公司 | Not oil immersion chromium magnalium is burnt into without carbonaceous sliding plate brick and preparation method thereof |
| CN108395228B (en) * | 2018-03-22 | 2021-03-09 | 无锡市南方耐材有限公司 | Fired non-oil-immersed chrome-magnesium-aluminum non-carbonaceous sliding plate brick and preparation method thereof |
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Application publication date: 20140514 |