CN103508739A - Low-cost dolomite continuous casting tundish coating - Google Patents
Low-cost dolomite continuous casting tundish coating Download PDFInfo
- Publication number
- 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
- Authority
- CN
- China
- Prior art keywords
- percent
- coating
- cost
- dolomite
- particles
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011248 coating agent Substances 0.000 title claims abstract description 24
- 238000000576 coating method Methods 0.000 title claims abstract description 24
- 239000010459 dolomite Substances 0.000 title claims abstract description 12
- 229910000514 dolomite Inorganic materials 0.000 title claims abstract description 12
- 238000009749 continuous casting Methods 0.000 title claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 36
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000011449 brick Substances 0.000 claims abstract description 13
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 13
- NACUKFIFISCLOQ-UHFFFAOYSA-N [Mg].[Cr] Chemical compound [Mg].[Cr] NACUKFIFISCLOQ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000004568 cement Substances 0.000 claims abstract description 9
- 239000004927 clay Substances 0.000 claims abstract description 8
- 239000000835 fiber Substances 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000003973 paint Substances 0.000 claims description 9
- 101710194948 Protein phosphatase PhpP Proteins 0.000 claims description 6
- HWGNBUXHKFFFIH-UHFFFAOYSA-I pentasodium;[oxido(phosphonatooxy)phosphoryl] phosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O HWGNBUXHKFFFIH-UHFFFAOYSA-I 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims description 6
- 235000019738 Limestone Nutrition 0.000 claims description 5
- 239000006028 limestone Substances 0.000 claims description 5
- 239000010419 fine particle Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000000843 powder Substances 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 22
- 239000000395 magnesium oxide Substances 0.000 description 11
- 229910000831 Steel Inorganic materials 0.000 description 7
- 229910052596 spinel Inorganic materials 0.000 description 7
- 239000011029 spinel Substances 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 230000003628 erosive effect Effects 0.000 description 5
- 239000001095 magnesium carbonate Substances 0.000 description 5
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 5
- 235000014380 magnesium carbonate Nutrition 0.000 description 5
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- GANNOFFDYMSBSZ-UHFFFAOYSA-N [AlH3].[Mg] Chemical compound [AlH3].[Mg] GANNOFFDYMSBSZ-UHFFFAOYSA-N 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical group OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000004902 Softening Agent Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- -1 therefore Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Landscapes
- Ceramic Products (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
A low-cost dolomite continuous casting tundish coating is prepared from the following raw materials in percentage by weight: 50 to 65 percent of dolomite particles, 30 to 45 percent of magnesia-chrome waste brick particles, 1 to 3.5 percent of alumina, 1 to 3.5 percent of soft clay, 1 to 2 percent of high alumina cement, 0.2 to 1.5 percent of sodium tripolyphosphate and 0.5 to 1.5 percent of paper fiber. The particle size ratio of the dolomite particles and the magnesia-chrome waste brick particles is as follows by weight percent: 35-45% of the particle size of 3-2 mm and 45-55% of the particle size of 2-1 mm; the rest is fine powder particles with the particle size less than 1 mm. Compared with the existing coating, the coating has low production cost and better service performance, realizes the recycling of the magnesium-chromium waste brick, and has 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 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN102757241B (en) | Stemming and purpose thereof | |
CN100436376C (en) | Ceramic Al203SiC refractory and preparation method thereof | |
CN100339170C (en) | Dry type working liner material for erosion resistance continuous casting tundish | |
CN101423416B (en) | Tundish magnesium dry-type stock adding aluminum hydroxide | |
CN103922771B (en) | Storage iron runner castable produced by adopting waste iron runner material | |
CN105859314B (en) | A kind of smelting molten steel equipment carbon containing gunning refractory and preparation method thereof | |
CN101891485A (en) | Pouring material for steel ladle | |
US10155696B2 (en) | Composition for providing a batch refractory ceramic product and method | |
CN101857446A (en) | Refractory castable for desulfurization stirrer | |
CN103351167A (en) | Preparation method of environmentally-friendly tundish dry working liner | |
CN101337821A (en) | Low density fire resistant pouring material for KR stirring paddle | |
CN103420683A (en) | Tundish low-carbon corundum spinel impact brick and preparation method thereof | |
CN103601517A (en) | Chemical-bonding aluminum-magnesium repairing material for steel ladle working lining | |
CN103508739A (en) | Low-cost dolomite continuous casting tundish coating | |
CN100348546C (en) | Method for preparing middle ladle dry vabrative material | |
CN104803687B (en) | Ultralow silicon coating capable of reducing oxygen content of tundish | |
CN100478306C (en) | High-alumina electric furnace cover pouring material and preparation method thereof | |
CN103130520B (en) | Steel ladle edge refractory castable and preparation method thereof | |
CN100355703C (en) | Refractory brick of aluminium-chromium silicon carbide | |
CN104446557A (en) | Al2O3-Cr2O3 refractory castable | |
CN103771866A (en) | Tundish dry working lining | |
CN101050125A (en) | Tundish dry type work lining mass of magnesiodolomite | |
CN102424594A (en) | MgAl2O4 / MgO-SiC-C composite refractory material and preparation method thereof | |
CN105198451A (en) | Continuous casting tundish coating | |
CN104193360B (en) | The repair method of RH tubular stinger soldering material and RH tubular stinger |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C05 | Deemed withdrawal (patent law before 1993) | ||
WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140115 |