CN103508739A - Low cost dolomite continuous casting tundish coating - Google Patents
Low cost dolomite continuous casting tundish coating Download PDFInfo
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- CN103508739A CN103508739A CN201210205704.3A CN201210205704A CN103508739A CN 103508739 A CN103508739 A CN 103508739A CN 201210205704 A CN201210205704 A CN 201210205704A CN 103508739 A CN103508739 A CN 103508739A
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- dolomite
- continuous casting
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Abstract
The invention relates to a low cost dolomite continuous casting tundish coating, which is prepared from the following raw materials by weight: 50%-65% of dolomite particles, 30%-45% of magnesium chromium waste brick particles, 1%-3.5% of bauxite, 1%-3.5% of soft clay, 1%-2% of high alumina cement, 0.2%-1.5% of sodium tripolyphosphate, and 0.5%-1.5% of paper fibers. The dolomite particles and the magnesium chromium waste brick particles have a particle size ratio, by weight, as the following: the particles with a particle size of 3-2mm account for 35%-45%, the particles with a particle size of 2-1mm account for 45%-55%; and the balance is fine powder particles with a particle size of less than 1mm. Compared with the prior coatings, the dolomite continuous casting tundish coating provided by the invention has the advantages of low production cost and good use performance, and realizes recycling of magnesium chromium waste bricks, thus having good economic and social benefits.
Description
Technical field
The invention belongs to continuous casting technology field in STEELMAKING PRODUCTION, the rhombspar matter coating that particularly a kind of continuous casting tundish is used.
Background technology
Tundish is the molten steel intermediate store during steel-making continuous casting is produced, and molten steel is played to the effects such as shunting, insulation, removal of inclusions, sequence casting.Bakie working lining plays important effect by coating quality quality to steel product quality.Therefore to bakie working lining, with the requirement of coating, be: resistance to erosion, resistance to erosion, good heat insulation, removal of inclusions ability by force, are not polluted molten steel, construction is simple, disintegration is good, cost is low etc.
It is aggregate that existing bakie working lining adopts fettling magnesite grain raw material with coating more, as Chinese patent CN1320577A, CN101342587A and CN101386543A, although this coating has stronger erosion-resisting characteristics and longer work-ing life, but because fettling magnesite grain cost of material is higher, in addition transportation cost is also high, so cost is high.Also there is the rhombspar of take matter as major ingredient, with addition of the tundish coating of fettling magnesite grain, chromite etc., as Chinese patent CN1074635A, but equally because fettling magnesite grain cost of material is high, its production cost is also higher, and not containing compositions such as paper fibers, its viscosifying power is poor.
Summary of the invention
The object of the present invention is to provide the use propertieies such as a kind of resistance to erosion, resistance to erosion good, can meet continuous casting situ production needs, and the low bakie paint for limestone continuous casting of production cost.
The present invention is achieved in that this low cost bakie paint for limestone continuous casting is formed by following preparation of raw material by weight percentage: dolomite particles 50%-65%, magnesium chromium useless brick particle 30%-45%, alumina 1%-3.5%, soft clay 1%-3.5%, high-alumina cement 1%-2%, tripoly phosphate sodium STPP 0.2%-1.5%, paper fiber 0.5%-1.5%.
The grain size proportion of the useless brick particle of dolomite particles of the present invention and magnesium chromium is by weight percentage: particle diameter 3-2 mm accounts for 35%-45%, and particle diameter 2-1 mm accounts for 45%-55%; All the other are the fine particle that is less than 1 mm.
The dolomite particles that the present invention is used, its main component is MgCO
3caCO
3, after high-temperature calcination, resolve into MgO, CaO and CO
2, CO wherein
2with gas form, discharge.The existence of free CaO in coating, favourable molten steel desulfurizing and remove Al
2o
3, purify hot metal; And CO
2after effusion, in coating, form uniform pore, can play insulation effect.In order to take into account production cost and the effect propety of coating, therefore, dolomite particles weight percent of the present invention is selected 50%-65%.
The useless brick particle of magnesium chromium used, its component target is: MgO>=55%, Cr
2o
3≤ 25%, CaO+SiO
2≤ 10%, Fe
2o
3≤ 10%.Magnesia-chrome sand particle under high temperature in paint matrix and alumina fine powder generate a small amount of magnesia chrome spinel (2180 ℃ of fusing points), have reduced the generation quantity of working lining eutectic when applied at elevated temperature, have improved the direct combination degree of material.Working lining with magnesia chrome spinel or secondary magnesia chrome spinel in conjunction with phase, there is higher refractoriness, higher loading soft spots, good heat-shock resistance, and because magnesia chrome spinel generates caused volumetric expansion, stop up pore in matrix, thereby reach obstruction slag, in working lining, permeate, improve material at high temperature performance and slag resistance.The useless brick particle of too much magnesium chromium can make coating working lining and thermal insulation layer cement, and affect tundish and turns over to wrap and come off, and therefore, the magnesium chromium of the present invention brick weight percentage that gives up is selected 30%-45%.
Tripoly phosphate sodium STPP used is high temperature adhesives, makes coating at high temperature in conjunction with firm, and resistance to slag corrodes, and its quality index is phosphoric acid salt P
2o
5>=50%.Too much or the very few high temperature bond power that all can cause is bad, and therefore, tripoly phosphate sodium STPP weight percent of the present invention is selected 0.2%-1.5%.
Soft clay used is softening agent, makes coating be easy to smear or spray, and its quality index is: Al
2o
3>=30%, Fe
2o
3≤ 3%, burn and lose < 15%, 1670 ℃ of refractoriness >.Too much or the very few mobility that all can affect coating of soft clay, therefore, soft clay weight percent of the present invention is selected 1%-3.5%.
Alumina used, its quality index is: Al
2o
3>=60%, CaO+MgO≤1%, Fe
2o
3≤ 2%.Alumina fine powder at high temperature with paint matrix in magnesia generate a small amount of magnesium-aluminium spinel (MgOAl
2o
3), take magnesium-aluminium spinel as the goods in conjunction with phase, there is higher refractoriness, higher loading soft spots, good heat-shock resistance, and because magnesium-aluminium spinel generates caused volumetric expansion, stop up pore in matrix, thereby reach obstruction slag, in working lining, permeate, improve the object of slag resistance.When alumina is very few, a little less than the anti-slag ability of coating, too much also can bring more Al into
2o
3, therefore, alumina weight percent of the present invention is selected 1%-3.5%.
Paper fiber used contains a certain amount of carbon, and the too high carbon that can cause in steel pouring process of consumption refluxes, and the quality of steel is had to disadvantageous effect; The viscosity of the too low slip of consumption is lower, the poor adhesion between working lining and permanent layer.Therefore, the present invention is limited to 0.5%-1.5% by the consumption of paper fiber.
High-alumina cement used plays binding agent effect in component, when low temperature, has sufficient intensity, and while making health baking, coating does not come off.Its composition requires: Al
2o
3>=40%, CaO>=28%; During the very few baking of high-alumina cement, coating easily comes off, and too much also can bring more Al into
2o
3, therefore, high-alumina cement weight percent of the present invention is selected 1%-2%.
During use, by said ratio, prepare burden, and then add the water that accounts for total raw material amount 17%-25%, after stirring, can be used for smearing or spraying tundish.
The present invention compared with prior art has following beneficial effect: compare with the coating that uses fettling magnesite grain to produce for aggregate, production cost reduces greatly; Compare with the coating that uses rhombspar+magnesia+chromite ore fine to produce, not only production cost decreases, and the use propertieies such as the high temperature bond of coating, anti-erosion, erosion resistibility are better; Realize the recycling of the useless brick of magnesium chromium, there is good economic and social benefit.
Embodiment
Below by embodiment, the present invention is further illustrated.
Embodiment 1
By weight percentage, adopt dolomite particles 55%, the magnesium chromium brick particle 38% that gives up, particle diameter 3-2 mm accounts for 35%, particle diameter 2-1 mm accounts for 45%, and all the other are less than the fine particle of 1 mm, alumina 2% for particle diameter, soft clay 2%, high-alumina cement 1.5%, tripoly phosphate sodium STPP 0.5%, paper fiber 1%, water by the additional raw material total amount 20% of mixture of said ratio, spreads upon on tundish lining after stirring.
Embodiment 1 tundish paint, records chemical composition and is: CaO 52.3%, MgO 32.6%, SiO after 3 hours through 1550 ℃ of calcinings
25.3%, Fe
2o
30.90%, Al
2o
30.8%, 1.34 grams/cc of volume densities, compressive strength: 110 ℃ * 24h, 11.3 MPa; 1550 ℃ * 3h, 12.2 MPa, line velocity of variation are: 1550 ℃ * 3h, and-2.4%, refractoriness>=1790 ℃.
Embodiment 2
By weight percentage, adopt dolomite particles 60%, the magnesium chromium brick particle 31% that gives up, particle diameter 3-2 mm accounts for 38, particle diameter 2-1 mm accounts for 48%, and all the other are less than the fine particle of 1 mm, alumina 2.5% for particle diameter, soft clay 2.5%, high-alumina cement 1.8%, tripoly phosphate sodium STPP 0.8%, paper fiber 1.4%, water by the additional raw material total amount 20% of mixture of said ratio, spreads upon on tundish lining after stirring.
Embodiment 2 tundish paints, record chemical composition and are: CaO 54.2%, MgO 30.5%, SiO after 3 hours through 1550 ℃ of calcinings
25.6%, Fe
2o
31.03%, Al
2o
30.7%, 1.33 grams/cc of volume densities, compressive strength: 110 ℃ * 24h, 11.5 MPa; 1550 ℃ * 3h, 12.4 MPa, line velocity of variation are: 1550 ℃ * 3h, and-2.5%, refractoriness>=1790 ℃.
Claims (2)
1. a low-cost bakie paint for limestone continuous casting, is characterized in that this coating is formed by following preparation of raw material by weight percentage: dolomite particles 50%-65%, magnesium chromium useless brick particle 30%-45%, alumina 1%-3.5%, soft clay 1%-3.5%, high-alumina cement 1%-2%, tripoly phosphate sodium STPP 0.2%-1.5%, paper fiber 0.5%-1.5%.
2. low-cost bakie paint for limestone continuous casting according to claim 1, the grain size proportion that it is characterized in that the useless brick particle of described dolomite particles and magnesium chromium is by weight percentage: particle diameter 3-2 mm accounts for 35%-45%, and particle diameter 2-1 mm accounts for 45%-55%; All the other are the fine particle that is less than 1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210205704.3A CN103508739A (en) | 2012-06-20 | 2012-06-20 | Low cost dolomite continuous casting tundish coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210205704.3A CN103508739A (en) | 2012-06-20 | 2012-06-20 | Low cost dolomite continuous casting tundish coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103508739A true CN103508739A (en) | 2014-01-15 |
Family
ID=49892229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210205704.3A Pending CN103508739A (en) | 2012-06-20 | 2012-06-20 | Low cost dolomite continuous casting tundish coating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103508739A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105198451A (en) * | 2014-06-09 | 2015-12-30 | 鞍钢股份有限公司 | Continuous-casting tundish coating |
| CN105601292A (en) * | 2015-12-30 | 2016-05-25 | 宜兴市集创新材料科技有限公司 | Acid-resistant and alkali-resistant fire-resistant repairing material |
| CN108913830A (en) * | 2018-10-12 | 2018-11-30 | 中冶节能环保有限责任公司 | A kind of slag ladle transported for melting casting residue heat insulating ability |
| CN109231968A (en) * | 2018-09-17 | 2019-01-18 | 武汉钢铁有限公司 | Continuous casting production working lining dry materials and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1382541A (en) * | 2002-04-12 | 2002-12-04 | 朱德智 | Lining material of tundish for conticasting |
| CN1459346A (en) * | 2002-05-21 | 2003-12-03 | 海城华宇耐火材料有限公司 | Steelmaking continuous casting tundish magnesium calcium paint |
| CN1800105A (en) * | 2005-10-14 | 2006-07-12 | 河北理工大学 | Dry type working liner material for erosion resistance continuous casting tundish |
-
2012
- 2012-06-20 CN CN201210205704.3A patent/CN103508739A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1382541A (en) * | 2002-04-12 | 2002-12-04 | 朱德智 | Lining material of tundish for conticasting |
| CN1459346A (en) * | 2002-05-21 | 2003-12-03 | 海城华宇耐火材料有限公司 | Steelmaking continuous casting tundish magnesium calcium paint |
| CN1800105A (en) * | 2005-10-14 | 2006-07-12 | 河北理工大学 | Dry type working liner material for erosion resistance continuous casting tundish |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105198451A (en) * | 2014-06-09 | 2015-12-30 | 鞍钢股份有限公司 | Continuous-casting tundish coating |
| CN105601292A (en) * | 2015-12-30 | 2016-05-25 | 宜兴市集创新材料科技有限公司 | Acid-resistant and alkali-resistant fire-resistant repairing material |
| CN109231968A (en) * | 2018-09-17 | 2019-01-18 | 武汉钢铁有限公司 | Continuous casting production working lining dry materials and preparation method thereof |
| CN108913830A (en) * | 2018-10-12 | 2018-11-30 | 中冶节能环保有限责任公司 | A kind of slag ladle transported for melting casting residue heat insulating ability |
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| C05 | Deemed withdrawal (patent law before 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140115 |