CN100339170C - Dry type working liner material for erosion resistance continuous casting tundish - Google Patents
Dry type working liner material for erosion resistance continuous casting tundish Download PDFInfo
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- CN100339170C CN100339170C CNB2005100129174A CN200510012917A CN100339170C CN 100339170 C CN100339170 C CN 100339170C CN B2005100129174 A CNB2005100129174 A CN B2005100129174A CN 200510012917 A CN200510012917 A CN 200510012917A CN 100339170 C CN100339170 C CN 100339170C
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- granularity
- magnesia
- continuous casting
- erosion resistance
- tundish
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Abstract
The present invention relates to an unshaped fireproofing material, particularly to a tundish dry type working lining material for continuously casting with the function of erosion resistance. Magnesite is used as a main raw material, light burned magnesia, a boracic acid, silicon powder, aluminum power, etc. are used as burning promotion agents, resin, dextrin, etc. are used as binding agents, and one or several kinds of chromium oxide, synthetic magnesia chromite sand and magnesia chromite waste bricks are added. The unshaped fireproofing material is concretely prepared from the raw materials by the following weight percentage: 10 to 35% of magnesite with the granularity of 5 to 1mm, 10 to 35% of magnesite with the granularity of 1 to 0.2mm, 20 to 40% of magnesite with the granularity which is larger than or is equal to 0.074mm, 5 to 20% of additive, 1 to 5% of burning promotion agent and 5 to 12% of binding agent, wherein the granularity of the additives is larger than or is equal to 0.088mm, the granularity of the burning promotion agents is larger than or is equal to 0.088mm, and all the raw materials are required to have certain quality technology indexes. The unshaped fireproofing material of the present invention is mainly used for tundish working linings of continuous casting, the high temperature strength and the residue penetration resistance of the working linings can be improved, the continuous casting rate is improved, and the erosion resistance capacity is obviously better than that of all the presently used tundish paint.
Description
Technical field:
The present invention relates to unshape refractory, particularly a kind of erosion resistance continuous casting tundish dry working lining.
Background technology:
Tundish is that molten steel is diverted to the intermediate store of crystallizer from ladle in the steel-making continuous casting production process, and is most important with many stoves continuous casting to guaranteeing clean steel-making.Tundish plays important effect with the quality of refractory quality to the quality stable and raising continuous casting steel that field trash, the maintenance steel of getting rid of in the molten steel flows.To bakie working lining with the requirement of refractory material be: anti-erosion, antiscour, good heat insulation is not polluted molten steel, is easy to construction and takes off bag etc.
The tundish working lining was a siliceous material from material in the past mostly, and siliceous material belongs to acid refractory, incompatible present alkalescence steel-making, thus now basic refractory that adopts more, based on magnesian.Classify from form of construction work, forms such as heat-insulating shield, coating, spray paint, dry-type working lining are arranged.Its characteristics are summarized as follows respectively: use alkaline heat-insulating shield to help cleaning steel-making, and adiabatic good, but shortcoming is to produce complexity, and cost is higher, and service life is lower, and labour intensity is bigger during installation; So replaced by tundish coating and spray paint gradually.Coating and spray paint generally use at present, and it is longer relatively to have service life, do not pollute advantages such as molten steel, but it need add the moisture about 20% when construction, through fully could using after the stirring, thereby have following deficiency:
Must add entry during 1. owing to coating and spray paint use, therefore reduce the intensity and the erosion-resisting characteristics of coating, thereby shortened the service life of coating;
2. owing to added water in coating and the spray paint, common must could the use through overbaking increased the stoving time of tundish, prolonged the production cycle; Inhale hydrogen in order to reduce molten steel in addition, must be baked to 1100-1200 ℃ and insulation.The bad problem such as explosion that also may occur of time control is copied in baking;
3. on-the-spot must must have spraying or mixing plant, has the plant maintenance complexity, the high deficiency of recondition expense;
4. coating occurs and the adhesion mutually of tundish permanent liner easily with spray paint, turns over problems such as bag difficulty.
In order to overcome many deficiencies of coating and spray paint, the refractory material workers are seeking a kind of tundish working lining more convenient, more excellent performance that uses.Publication number is that the application for a patent for invention of CN1333098A discloses a kind of continuous casting tundish alkaline dry material.This working lining wraps turnover rate simplifying site operation in the raising, all be much better than coating, but owing to introduced more boride, fluoride, phosphate, at high temperature easy and magnesia generates eutectic, has influenced service life.Publication number is that the patent of invention of CN1382541A discloses a kind of continuous casting tundish working lining, more alumina, mild-clay have been introduced, at high temperature generated a spot of magnesium aluminate spinel, thereby improved the service life of tundish, but because the introducing of alumina and clay is more, may increase silicon to steel quality, in addition, the use of bond medium pitch makes that the job site environment is relatively poor.
Summary of the invention:
Purpose of the present invention is intended to solve the deficiency of heat-insulating shield, coating, spray paint and existing dry type material, and provide a kind of have both can simplify site operation, save time, laborsaving, can improve working lining elevated temperature strength and slag resistance again, do not pollute molten steel, the erosion resistance continuous casting tundish dry working lining of characteristics such as long service life simultaneously in addition.
The technical scheme that realizes the foregoing invention purpose is: this its material component of erosion resistance continuous casting tundish dry working lining is by mass percentage: granularity is the magnesia 10-35% of 5-1mm, granularity is the magnesia 10-35% of 1-0.2mm, the magnesia of granularity≤0.074mm is 20-40%, the additive of granularity≤0.088mm is 5-20%, the short burning agent of granularity≤0.088mm is 1-5%, bond is 5-12%, and above each component quality sum is 100%.
Its quality index of described magnesia is: MgO 〉=95.0%, SiO
2≤ 2.0%, CaO≤1.6%, igloss≤1.0%, particle volume density 〉=3.25g/cm
3
Described additive is one or more combinations in chromium oxide, synthetic magnesia chromite clinker, the useless brick of magnesium chromium.
Described short burning agent is one or more combinations in light calcined magnesia, boric acid, silica flour, the aluminium powder.
Described bond is resin, dextrin one of them or boths' combination.
Its production method is as follows: various raw materials are pressed the list of ingredients batching, stir in mixer, the packaging bag of packing into gets final product.
It is as follows that it makes the lining process:
1. remove the residue on the tundish permanent liner;
2. install parts such as the following mouth of a river, bottom;
3. bottom tiling about 40-60mm of dry type material and tamping;
4. lifted fetal membrane make it with permanent layer around the gap even, about 40mm;
5. the method shaping work with vibration or ramming serves as a contrast;
6. toasted 1-3 hour with 150 ℃-300 ℃ temperature at the fetal membrane inner chamber;
7. take off the lining work of making that fetal membrane is promptly finished the work and served as a contrast.
Compared with prior art, continuous casting tundish working lining of the present invention can improve the elevated temperature strength and the slag corrosion resistance ability of the working lining that generally uses at present, improves service life, and reason is as follows:
On the one hand, compare with spray paint or coating, be not only because the dry type material has been avoided the effect of water, owing to do not introduce material such as clay in the batching, make that eutectic significantly reduces in the wadding, corrosion resistance is strong, high life;
On the other hand, compare with dry type material commonly used at present, owing to introduced an amount of chromium oxide fine powder or synthetic magnesia chromite clinker fine powder, in the high temperature use, formed dystectic magnesia chrome spinel (2180 ℃ of fusing points), thereby not only reduced the generation quantity of working lining eutectic when high temperature uses, and improved the direct combination degree of material; In addition, with magnesia chrome spinel or secondary magnesia chrome spinel serves as directly in conjunction with the working lining of phase, not only has higher refractoriness, higher load softening point, and owing to generate the caused volumetric expansion of magnesia chrome spinel, stop up the pore in the matrix, suppressed the infiltration of slag in working lining, thereby improved the elevated temperature strength and the slag corrosion resistance ability of material greatly.
In addition, be short agglutinant with light calcined magnesia, also avoided introducing the silicon-containing material of silicon ash, clay and so on, not only make working lining pure, reduce molten steel and increased the possibility of silicon, and can also improve the corrosion resistance of working lining.
The specific embodiment:
Below in conjunction with embodiment in detail the present invention is described in detail.
Present embodiment is a preferred version of the present invention, and it is big to have elevated temperature strength, and the slag corrosion resistance ability is strong, service life characteristics such as height.
Its raw material proportioning is:
Magnesia: granularity is the magnesite clinker 33% of 5-1mm, and granularity is the magnesite clinker 20% of 1-0.2mm, the magnesite clinker 28% of granularity≤0.074mm;
The fused magnesia-chrome 7% of additive: granularity≤0.088mm, Cr2O3 micro mist 3%;
The short light calcined magnesia 2% that burns agent: granularity≤0.045mm;
Bond: resin-oatmeal 5%, dextrin 2%.
The technical indicator of raw material detects as follows:
Magnesite clinker: MgO 〉=95.0%, SiO
2≤ 2.0%, CaO≤1.6%, igloss≤1.0%, particle volume density 〉=3.25g/cm
3
Fused magnesia-chrome: MgO 〉=68.0%, SiO
2≤ 1.0%, CaO≤1.0%, Fe2O3≤7.0%, Cr2O3 〉=15.0%, particle volume density 〉=3.60g/cm
3
Light calcined magnesia: MgO 〉=96.0%, SiO
2≤ 0.35%, CaO≤1.0%, igloss≤2.0%.
Cr2O3 micro mist: Cr2O3 〉=99.0%.
Produced a collection of working lining by last preferred version, it is the same to make the lining process.Its physical and chemical index is: chemical composition: MgO is 80.71%, SiO
2Be 1.17%, Cr2O3 is 4.23%, physical property: bulk density is 2.45g/cm behind the 200 ℃ * 3h
3, apparent porosity is 27%, compressive resistance is 48MPa.
Product of the present invention has carried out contrast at certain steel mill and its magnesia coating that is using, magnesium dry-type stock to be used, 30 tons in the shared material of this product, and accumulative total has been carried out 16 and has been watered time, and the steel grade of cast is variety steel.
Its performance indications are to such as table 1, and it uses contrast situation such as following table 2.
Table 1
| Kind | Chemical composition | Physical property | |||||||
| MgO | SiO 2 | Cr2O3 | 200℃×3h | 1500℃×3h | |||||
| Bulk density (g/cm 3) | Apparent porosity (%) | Compressive resistance (MPa) | Bulk density (g/cm 3) | Apparent porosity (%) | Compressive resistance (MPa) | ||||
| Embodiment | 80.71 | 1.17 | 4.23 | 2.45 | 27 | 48 | 2.50 | 23 | 80 |
| The dry type material | 87.83 | 1.85 | - | 2.26 | 30 | 35 | 2.30 | 27 | 66 |
| Coating | 86.00 | 6.00 | - | 2.10 | 40 | 12 | 2.15 | 36 | 35 |
Table 2
| Kind | The capacity (t) of bag | Bag base thickness degree (mm) | Sidewall thickness (mm) | Average throwing stove number | The average throwing time (min) | Slag line erosion rate (mm/min) | High temperature break resistant intensity MPa (1500 ℃ * 3h) |
| Embodiment | 15 | 40 | 50 | 7.44 | 521 | 0.001 | 5.6 |
| The dry type material | 15 | 40 | 50 | 7.44 | 521 | 0.003 | 2.4 |
| Coating | 15 | 40 | 50 | 7.44 | 521 | 0.006 | 1.5 |
Claims (2)
1, a kind of erosion resistance continuous casting tundish dry working lining, it is characterized in that material component is by mass percentage: granularity is the magnesia 10-35% of 5-1mm, granularity is the magnesia 10-35% of 1-0.2mm, the magnesia of granularity≤0.074mm is 20-40%, the additive of granularity≤0.088mm is 5-20%, the short burning agent of granularity≤0.088mm is 1-5%, and bond is 5-12%, and above each component quality sum is 100%; Described additive is one or more combinations in chromium oxide, synthetic magnesia chromite clinker, the useless brick of magnesium chromium; Described short burning agent is one or more combinations in light calcined magnesia, boric acid, silica flour, the aluminium powder; Described bond is resin, dextrin one of them or boths' combination.
2, according to claims 1 described erosion resistance continuous casting tundish dry working lining, it is characterized in that its quality index of described magnesia is: MgO 〉=95.0%, SiO
2≤ 2.0%, CaO≤1.6%, igloss≤1.0%, particle volume density 〉=3.25g/cm
3
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100129174A CN100339170C (en) | 2005-10-14 | 2005-10-14 | Dry type working liner material for erosion resistance continuous casting tundish |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100129174A CN100339170C (en) | 2005-10-14 | 2005-10-14 | Dry type working liner material for erosion resistance continuous casting tundish |
Publications (2)
| Publication Number | Publication Date |
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| CN1800105A CN1800105A (en) | 2006-07-12 |
| CN100339170C true CN100339170C (en) | 2007-09-26 |
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| CNB2005100129174A Expired - Fee Related CN100339170C (en) | 2005-10-14 | 2005-10-14 | Dry type working liner material for erosion resistance continuous casting tundish |
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| CN100453211C (en) * | 2007-06-22 | 2009-01-21 | 河北理工大学 | Method for preparing dry working lining |
| CN101381239B (en) * | 2008-10-13 | 2012-05-23 | 安徽省合普热陶瓷有限责任公司 | Magnesium oxide precast refractory material and construction method thereof |
| CN102372486B (en) * | 2010-08-24 | 2015-01-21 | 鞍钢实业集团有限公司原燃料生产服务分公司 | Low-cost magnesium tundish paint and its preparation method |
| CN102167603A (en) * | 2010-12-28 | 2011-08-31 | 攀枝花钢城集团有限公司 | Additive for pouring box dry vibrating material and preparation method and application thereof |
| CN103508739A (en) * | 2012-06-20 | 2014-01-15 | 鞍钢股份有限公司 | Low cost dolomite continuous casting tundish coating |
| CN102731121B (en) * | 2012-07-12 | 2013-09-11 | 辽宁中镁高温材料有限公司 | High-performance magnesium-aluminum-chromium composite spinel brick and manufacturing method thereof |
| CN102795867B (en) * | 2012-08-08 | 2015-03-25 | 江苏大学 | Continuous casting tundish working layer coating |
| CN103408309B (en) * | 2013-07-16 | 2015-04-29 | 辽宁科技大学 | Non-sticking tundish dry material and production method thereof |
| CN103553676B (en) * | 2013-10-29 | 2015-01-14 | 辽宁中兴矿业集团有限公司 | Environment-friendly magnesia-chrome brick for steel refining and non-ferrous metal smelting and preparation method thereof |
| CN105016741A (en) * | 2014-04-15 | 2015-11-04 | 上海梅山钢铁股份有限公司 | High adhesion repair material for RH furnace chromium-free magnesium-aluminum spinel brick |
| CN104311045B (en) * | 2014-09-28 | 2016-03-02 | 濮阳濮耐高温材料（集团）股份有限公司 | Tundish light paint of a kind of resin-bonded and preparation method thereof |
| CN105152662B (en) * | 2015-09-25 | 2017-09-29 | 攀枝花钢城集团有限公司 | Medium frequency induction furnace body dry type ramming material |
| CN106083092B (en) * | 2016-06-22 | 2019-04-23 | 山东国茂冶金材料有限公司 | A kind of preferably inexpensive tundish dry material of anti-steel slag permeability and its preparation method |
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| CN106673674A (en) * | 2016-12-02 | 2017-05-17 | 周九喜 | Tundish dry material and preparation method thereof |
| CN107903040A (en) * | 2017-11-22 | 2018-04-13 | 海城利尔麦格西塔材料有限公司 | A kind of magnesium chromium matter ramming mass and production method for liquid steel refining stove furnace bottom |
| CN111170723A (en) * | 2019-11-21 | 2020-05-19 | 武汉钢铁集团耐火材料有限责任公司 | Magnesium high-strength gunning mix |
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| CN113387687B (en) * | 2021-07-05 | 2022-11-29 | 上海利尔耐火材料有限公司 | Dry material for working layer of steelmaking tundish |
| CN113843411B (en) * | 2021-09-01 | 2023-03-28 | 鞍山钢铁冶金炉材科技有限公司 | Low-cost composite dry material working lining for two-flow plate blank continuous casting tundish and construction method |
| CN114380577B (en) * | 2022-03-24 | 2022-06-28 | 北京利尔高温材料股份有限公司 | Low-silicon tundish dry material for high-quality steel |
| CN115180929A (en) * | 2022-06-29 | 2022-10-14 | 无锡市宝宜耐火材料有限公司 | Anti-oxidation Al 2 O 3 -SiC-C refractory castable and preparation method thereof |
| CN115403395B (en) * | 2022-09-01 | 2023-12-01 | 中铜东南铜业有限公司 | Resource utilization method of copper smelting waste magnesium-chromium bricks |
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| US5036029A (en) * | 1989-04-28 | 1991-07-30 | Consolidated Ceramic Products, Inc. | Sprayable insulating liner compositions for metal vessels |
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| CN1800105A (en) | 2006-07-12 |
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Assignee: Tangshan City Guo Liang Special fire-proof material Inc Assignor: Hebei Univ. of Science & Technology Contract record no.: 2010990001001 Denomination of invention: Dry type working liner material for erosion resistance continuous casting tundish Granted publication date: 20070926 License type: Exclusive License Open date: 20060712 Record date: 20101223 |
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Address after: Xinhua Xidao 063009 Hebei province Tangshan City Lunan District No. 46 Patentee after: North China Polytechnics Address before: Xinhua Xidao 063009 Hebei province Tangshan City Lunan District No. 46 Patentee before: Hebei Univ. of Science & Technology |
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