CN105198452A - Magnesia carbon brick for furnace wall hot spot area of steelmaking electric-arc furnace - Google Patents
Magnesia carbon brick for furnace wall hot spot area of steelmaking electric-arc furnace Download PDFInfo
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- CN105198452A CN105198452A CN201510464298.6A CN201510464298A CN105198452A CN 105198452 A CN105198452 A CN 105198452A CN 201510464298 A CN201510464298 A CN 201510464298A CN 105198452 A CN105198452 A CN 105198452A
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- furnace
- furnace wall
- magnesia carbon
- carbon brick
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- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
A magnesia carbon brick for a furnace wall hot spot area of a steelmaking electric-arc furnace is mainly prepared from 4% of SiO2, 0.28% of Fe2O3, 0.3% of Al2O3, 1.68% of CaO, 81.34-82.34% of MgO and 11.4-16.4% of C through pressing by a mould. The magnesia carbon brick is 3.0-3.5% in surface porosity, 3.0-3.03 g/cm<3> in volume tightness, 38.0-42.0 Mpa in compressive strength, larger than 1700 DEG C in refractoriness under load, larger than 1800 DEG C in refractory temperature, good in slag resistance, and high in heat stability and can meet growing needs of power levels of the electric-arc furnace. The magnesia carbon brick is good in high temperature resistance and high pressure resistance, low in surface porosity and good in slag resistance and heat stability.
Description
Technical field
The present invention relates to a kind of refractory materials, particularly relate to a kind of magnesia carbon brick for electric furnace arrangement for producing steel hot spots on the furnace wall district.
Background technology
Along with the development that world steel is produced, the ratio of Electric furnace steel making improves constantly, account for about 30% of World Steel output at present, especially with the establishment of electric furnace-continuous casting and direct rolling Mini-Mill that is feature, electric steel is obtained develop on a large scale very much, the Novel electric furnace of development in recent years mainly contains superpower electric furnace in the world, galvanic current, bivalve electric furnace etc., along with the development of furnace outer refining process, electric furnace is more outstanding as the function of first furnace, the combine operations of electric furnace-refining furnace, the smelting cycle of electric furnace is shortened greatly, there is the trend of rhythm of production converter, rhythm of production improves greatly.
Electric furnace can all with steel scrap as raw metal, mechanical property can be smelted and chemical composition requires strict steel, as special tool steel, aviation steel and stainless steel etc.
Electric furnace is divided into acid and alkalescence two kinds by all furnace linings.At present main basic electric furnace, this furnace lining effectively can remove the sulphur in steel, this be other method for making steel can not and.Particularly three-phase steel-making uhp electric arc furnace is smelted, and the furnace wall refractory thickness nearest apart from three-phase furnace arc light is too thin, and cannot continue to smelt, be the major cause that most steel-smelting electric furnace is forced to repair in blowing out.
One, electric arc furnace thermal source
Point-like heat source and three phase supply system are the roots that hot spots on the furnace wall produces.
1. point-like heat source, the radiant heat of arclight is the main heating source of electric-arc furnace steelmaking.Arc light temperature is very high, and the arc temperature fluctuation of common power electric arc furnace is 4000 ~ 8000
°between K.The arc temperature fluctuation of uhp electric arc furnace is 8000 ~ 10000
°between K.Because the heat of arc light is very concentrated, compare with furnace volume, account for volume very little.Therefore, often approximate for electric arc point is used as point-like heat source to investigate, is namely used as radiant heat source point.
According to radiative transfer law, the radiation power of point-like heat source suffered in any unit surface in burner hearth and thermal source distance square inversely proportional, in direct ratio with the radiation of heat point source.When heated part, furnace wall one timing, the increase along with the arc power in input stove increases by the arc radiation power so this position unit surface obtained.The surface temperature at this position is higher.
The heating status of furnace wall is relevant with the power supply number of phases adopted.
Single-phase arc funace only has one due to point-like heat source, and arrangement of electrodes is in burner hearth central authorities.Therefore, burner hearth any point of distance bath level face equal height is all equal with the distance of arc center, and the temperature of furnace wall generating surface is equal, the burner hearth refractory materials at high temperature loss of single-phase arc funace just more even.
But furnace wall heating status and the single-phase stove of three-phase electric furnace arrangement for producing steel are completely different.Being distributed in straight tube shape burner hearth of three-phase electric furnace arrangement for producing steel three electrodes forms three point-like heat source, i.e. 1#, 2#, 3# by three electrodes.The weld pool surface that three electrode end surfaces face toward defines three high-temperature zones in molten bath.Because three electrodes are arranged in equilateral triangle on circular weld pool surface, so just there are A, B, C tri-points that distance three-phase electric arc is nearest on burner hearth.These three points hot spots on the furnace wall.The region at focus place is hot zone.Equally, furnace wall cold spot is distance three-phase electric arc D, E, F farthest at 3.Cold spots in the area called cold spots in alkaline area.Hot spots on the furnace wall surface and cold spot surface are the hot side of furnace wall and the huyashi-chuuka (cold chinese-style noodles) of furnace wall respectively.
Compare with furnace wall huyashi-chuuka (cold chinese-style noodles), furnace wall hot-face surface temperature is high, and temperature rises fast, and the fluctuating range of temperature is large, and refractory wear must be faster.Therefore, the hot spots on the furnace wall of three-phase steel-smelting electric furnace has just become to maintain the most weak part that furnace wall is in good running status.
The arc light radiation power that any point, furnace wall unit surface of three-phase electric furnace arrangement for producing steel obtains all is provided by three point-like heat source.
Two, the loss process of alkaline furnace wall
After new stove is gone into operation, along with the increase of smelting furnace number, furnace wall thickness is progressively thinning.
1. new furnace wall loss process
Alkalescence furnace wall is roughly as follows by thick thinning general process:
1. furnace wall generating surface softens
In strong arc light radiation, the hot-face temperature of furnace wall is higher.When furnace wall temperature reaches and exceed the load softening point of furnace wall refractory, be generally not less than the soften layer that 1500 DEG C just there will be one deck semi-melting state on hot side.
2. soften layer goes bad
In the smelting process of one heat steel, soften layer constantly accepts from materials such as furnace gas, flue dust and slags.Wherein both containing picture SiO
2, P
2o
3deng acidic oxide, again containing FeO, Fe
2o
3in basic oxide.
Traditional magnesia carbon brick design is that the common electric melting magnesia of matrix adopts resol to do bonding agent furnace wall magnesia carbon brick soften layer to contact once same acidic oxide, just there occurs chemical reaction with MgO.As a result, soften layer becomes silicate metamorphic layer.
Meanwhile, the SiO in slag
2, the oxide compounds such as FeO also generate and spread to base layer via soften layer, the phenomenon of infiltration.
FeO in slag can not only reduce furnace wall hot side fusing point, but also plays decarburizating to the furnace wall magnesia carbon brick of resin-bonded.Its reaction is as follows: (FeO)+C is solid=and { CO } ↑+Fe
Decarburization result, will make furnace wall surface porosity increase, to the condition that the diffusion of slag and osmosis create.
Based on said process, furnace wall soften layer goes bad, and fusing point declines.SiO in slag
2, FeO, Fe
2o
3deng CaO, MgO effect of oxide compound and furnace wall, generate low melting point eutectic or compound.Concrete fusing point sees the following form: table 1 two component system melting point substance
And the such as CaO.SiO in metamorphic layer
2, CaO.Fe
2o
3, the low melting component such as CaO.2FeO and Low melting point eutectic fall into molten bath by being melted at such a temperature.F. peeling off comes off is the another kind surface that furnace wall metamorphic layer comes off.Upper stove has gone out steel, furnace wall temperature rapid drawdown, furnace wall internal layer generation tensile stress.Produce vertical and horizontal crackle.After electric furnace blowing out cooling, obviously can see the crackle of furnace wall surface.During the hurried intensification in furnace wall, produce shear stress between furnace wall table, nexine, result makes metamorphic layer and hypothallus peel off, and comes off.The stove labour later stage, due to bottom, furnace wall by refractory materials near slag line be etched very serious, too thin, the refractory materials that its top of giving away is thicker, makes furnace wall, local lose mechanically stable and causes and cave in suddenly.Because the area that collapses is comparatively large, metamorphic layer is also destroyed more.Therefore, sometimes also have to be forced to repair in blowing out.
Based on the loss process of above-mentioned magnesia furnace wall, for guaranteeing the normal production of steel-smelting electric furnace, furnace wall refractory should meet following requirement.(1) high refractoriness; (2) high load softening point; (3) high compressive strength; (4) high mechanical stability; (5) high volume weight; (6) low apparent porosity; (7) good slag resistance; (8) good thermal shock resistance.
Summary of the invention
Object of the present invention, is to provide a kind of magnesia carbon brick for electric furnace arrangement for producing steel hot spots on the furnace wall district, and this magnesia carbon brick is high temperature resistant, high voltage performance good, and apparent porosity is low, and slag resistance is good, Heat stability is good.
The technical scheme adopted is:
For the magnesia carbon brick in electric furnace arrangement for producing steel hot spots on the furnace wall district, mainly by SiO
2, Fe
2o
3, Al
2o
3, CaO, MgO and C, by mould compression moulding, its weight batching ratio is:
SiO
2be 4%, Fe
2o
3be 0.28%, Al
2o
3be 0.3%, CaO is 1.68%, MgO be 82.34-81.34 and C is 11.4-16.4%.
Magnesia carbon brick apparent porosity of the present invention is 3.0-3.5%, volume tightness is 3.0-3.03g/cm
3, compressive strength is 38.0-42.0Mpa, refractoriness under load > 1700 DEG C, refractory temperature > 1800 DEG C, and slag resistance is good, and thermal stability is high, can meet the needs that electric arc furnace power level is growing.
Embodiment:
Embodiment one
For the magnesia carbon brick in electric furnace arrangement for producing steel hot spots on the furnace wall district, be by SiO
2be 4%, Fe
2o
3be 0.28%, Al
2o
3be 0.3%, CaO be 1.68%, MgO be 81 and C be 12.74%, made by brick press after mixing.
Embodiment two
For the magnesia carbon brick in electric furnace arrangement for producing steel hot spots on the furnace wall district, be by SiO
2be 4%, Fe
2o
3be 0.28%, Al
2o
3be 0.3%, CaO be 1.68%, MgO be 81.34 and C be 12.4%, made by brick press after mixing.
Embodiment three
For the magnesia carbon brick in electric furnace arrangement for producing steel hot spots on the furnace wall district, be by SiO
2be 4%, Fe
2o
3be 0.28%, Al
2o
3be 0.3%, CaO be 1.68%, MgO be 82.34 and C be 11.4%, made by brick press after mixing.
The per-cent of above-mentioned three embodiments is weight percentage.
Claims (4)
1. for the magnesia carbon brick in electric furnace arrangement for producing steel hot spots on the furnace wall district, it is characterized in that: this magnesia carbon brick is mainly by SiO
2, Fe
2o
3, Al
2o
3, CaO, MgO and C, by mould compression moulding, its weight batching ratio is:
SiO
2be 4%, Fe
2o
3be 0.28%, Al
2o
3be 0.3%, CaO is 1.68%, MgO be 82.34-81.34 and C is 11.4-16.4%.
2. a kind of magnesia carbon brick for electric furnace arrangement for producing steel hot spots on the furnace wall district according to claim 1, is characterized in that: be by SiO
2be 4%, Fe
2o
3be 0.28%, Al
2o
3be 0.3%, CaO be 1.68%, MgO be 81 and C be 12.74%, made by brick press after mixing.
3. a kind of magnesia carbon brick for electric furnace arrangement for producing steel hot spots on the furnace wall district according to claim 1, is characterized in that: be by SiO
2be 4%, Fe
2o
3be 0.28%, Al
2o
3be 0.3%, CaO be 1.68%, MgO be 81.34 and C be 12.4%, made by brick press after mixing.
4. a kind of magnesia carbon brick for electric furnace arrangement for producing steel hot spots on the furnace wall district according to claim 1, is characterized in that: be by SiO
2be 4%, Fe
2o
3be 0.28%, Al
2o
3be 0.3%, CaO be 1.68%, MgO be 82.34 and C be 11.4%, made by brick press after mixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510464298.6A CN105198452A (en) | 2015-08-03 | 2015-08-03 | Magnesia carbon brick for furnace wall hot spot area of steelmaking electric-arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510464298.6A CN105198452A (en) | 2015-08-03 | 2015-08-03 | Magnesia carbon brick for furnace wall hot spot area of steelmaking electric-arc furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105198452A true CN105198452A (en) | 2015-12-30 |
Family
ID=54946480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510464298.6A Withdrawn CN105198452A (en) | 2015-08-03 | 2015-08-03 | Magnesia carbon brick for furnace wall hot spot area of steelmaking electric-arc furnace |
Country Status (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111926146A (en) * | 2020-09-16 | 2020-11-13 | 攀钢集团研究院有限公司 | Method for reducing consumption of refractory material of electric furnace |
| CN113943145A (en) * | 2021-11-08 | 2022-01-18 | 邯郸市翰润达耐火材料有限公司 | Unburned magnesia carbon brick and preparation method and application thereof |
| CN114061308A (en) * | 2021-11-15 | 2022-02-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Carbide slag smelting electric furnace |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4039342A (en) * | 1970-04-21 | 1977-08-02 | Bergwerksverband Gmbh | Firebricks |
| CN101475382A (en) * | 2008-12-30 | 2009-07-08 | 上海柯瑞冶金炉料有限公司 | Low carbon magnesia-carbon brick, method for manufacturing the same and use thereof |
| CN103396138A (en) * | 2013-07-31 | 2013-11-20 | 武汉钢铁(集团)公司 | Novel converter magnesia carbon brick and preparation method thereof |
-
2015
- 2015-08-03 CN CN201510464298.6A patent/CN105198452A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4039342A (en) * | 1970-04-21 | 1977-08-02 | Bergwerksverband Gmbh | Firebricks |
| CN101475382A (en) * | 2008-12-30 | 2009-07-08 | 上海柯瑞冶金炉料有限公司 | Low carbon magnesia-carbon brick, method for manufacturing the same and use thereof |
| CN103396138A (en) * | 2013-07-31 | 2013-11-20 | 武汉钢铁(集团)公司 | Novel converter magnesia carbon brick and preparation method thereof |
Non-Patent Citations (3)
| Title |
|---|
| 徐崇灏: "炼钢电弧炉炉壁热点寿命", 《电炉》 * |
| 李红霞: "《耐火材料手册》", 31 January 2007, 冶金工业出版社 * |
| 游杰钢: "《钢铁冶金用耐火材料》", 30 June 2014, 冶金工业出版社 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111926146A (en) * | 2020-09-16 | 2020-11-13 | 攀钢集团研究院有限公司 | Method for reducing consumption of refractory material of electric furnace |
| CN113943145A (en) * | 2021-11-08 | 2022-01-18 | 邯郸市翰润达耐火材料有限公司 | Unburned magnesia carbon brick and preparation method and application thereof |
| CN114061308A (en) * | 2021-11-15 | 2022-02-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Carbide slag smelting electric furnace |
| CN114061308B (en) * | 2021-11-15 | 2023-10-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Electric furnace for smelting carbonized slag |
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| PB01 | Publication | ||
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Application publication date: 20151230 |