CN1308101C - Covering agent for pouring basket in high alkalinity - Google Patents
Covering agent for pouring basket in high alkalinity Download PDFInfo
- Publication number
- CN1308101C CN1308101C CNB2004100165918A CN200410016591A CN1308101C CN 1308101 C CN1308101 C CN 1308101C CN B2004100165918 A CNB2004100165918 A CN B2004100165918A CN 200410016591 A CN200410016591 A CN 200410016591A CN 1308101 C CN1308101 C CN 1308101C
- Authority
- CN
- China
- Prior art keywords
- tundish
- molten steel
- basicity
- tundish covering
- covering agent
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to a tundish covering agent with high basicity, which comprises the following components (mass percentage): 70 to 90% of calcium aluminate, 0.1 to 20% of magnesia, 0.1 to 10% of adhesive, 0.1 to 5% of additives, 0 to 25% of calcium carbonate and 0 to 5% of quartz sand, wherein the calcium aluminate is formed by smelting 55 to 70% the calcium carbonate and bauxite at high temperature; the adhesive is dextrin, flour or water glass; various components are stuck to generate a definite strength; and the additives are phosphate, lignosulphonate, citric acid, glycerine, naphthalene series water reducer, water soluble resin water reducer or ethylene glycol. The tundish covering agent takes the calcium aluminate as main raw materials, the basicity (CaO/SiO2>/=6.0) is higher, total oxygen in molten steel in a tundish can be effectively reduced, sulfur in the molten steel in the tundish can be further removed, cleanliness of the molten steel in the tundish is improved, reoxidation of the molten steel in the tundish is effectively prevented, and thus, the quality of casting blanks is improved, and simultaneously the tundish covering agent has favorable heat-insulating property.
Description
Technical field
The present invention relates to steel-making continuous casting auxiliary material, particularly tundish covering flux.
Background technology
As storing and carrying the tundish of molten steel is a transient response device in the metallurgical process, it distributes to crystallizer in order to the molten steel that ladle is transported, stablizing poring rate, lower the impact momentum of beam in crystallizer, is the desirable place of removing field trash in the molten steel.
Tundish covering flux is a kind of artificial synthetic auxiliary material that are added in granular pattern on the tundish molten steel face or powder-type, its role is to: (1) adiabatic heat-insulation, reduce the temperature drop of steel pouring process molten steel; (2) secluding air prevents the molten steel secondary oxidation; (3) absorb the non-metallic inclusion that the molten steel face floats.
Tundish covering flux commonly used at present has acid slag, neutral slag and basic slag three major types, and concrete kind and composition are as shown in table 1 below, and basicity R is defined as: R=CaO/SiO
2
Table 1
| The slag kind | The dreg chemistry composition | Basicity | Remarks | ||||||
| CaO | Al 2O 3 | SiO 2 | MgO | Auxiliary agent | Burning subtracts | Other | |||
| Acid slag | 0.6 | 0.5 | 26.9 | 0.5 | 5.72 | 64.86 | 0.92 | 0.02 | |
| Neutral slag | 23.82 | 21.06 | 29.15 | 4.75 | 4.06 | 13.70 | 3.46 | 0.82 | |
| 38.20 | 4.86 | 25.66 | 10.94 | 2.54 | 12.70 | 5.10 | 1.49 | ||
| 36.32 | 5.95 | 27.85 | 15.38 | 2.67 | 8.88 | 2.95 | 1.30 | ||
| Basic slag | 27.71 | 19.28 | 12.93 | 17.96 | 6.16 | 11.65 | 4.31 | 2.14 | Calcareous |
| 4.15 | 0.59 | 1.80 | 86.94 | 0.98 | 4.63 | 0.91 | 2.30 | Magnesia | |
Wherein:
Advantage: heat-insulating property is good;
Shortcoming: to protection and absorption Al
2O
3Ability not ideal enough, the easy carburetting of molten steel or absorb hydrogen.
Advantage: easily on the molten steel face, form liquid slag, the ability of strong absorption Al2O3 is arranged;
Shortcoming: heat insulation effect is not good.
Basic slag divide calcareous and magnesia two big classes, but basicity R is usually less than 3.0.
Advantage: the ability that certain absorption Al2O3 is arranged;
Shortcoming: secluding air prevents that the effect of molten steel secondary oxidation is relatively poor.Present tundish covering flux basicity (CaO/SiO
2) usually all less than 3.0.Though as U.S. Pat 6174347B1, US6179895B1 is a kind of tundish covering flux of high basicity, but it is a primary raw material with the slag charge that ladle metallurgy stove (Ladle Metallgy Furnace) refining finishes, impurity element in this kind material, content as S is higher relatively, is not suitable for the production that S is had the steel grade of requirement.
Summary of the invention
The object of the present invention is to provide a kind of high basicity tundish covering flux, when satisfying adiabatic heat-insulation, prevent the molten steel secondary oxidation and absorbing the tundish covering flux conventional func such as non-metallic inclusion of molten steel face come-up, more stress its metallurgical function, promptly reduce T[O in the molten steel] amplitude that increases, in tundish, make the further desulfurization of molten steel, and alleviate the erosion degree of coverture to refractory material, improve the cleannes of molten steel.
Studies show that: along with SiO in the coverture
2The increase of the reduction of content and coverture basicity, T[O in the molten steel] reduce, because the molten steel of aluminium deoxidation and contain SiO
2Coverture following reaction will take place when contacting:
SiO in coverture
2When content reduced, the positive reaction speed of reactional equation (1) will reduce, like this by Al
2O
3Product is brought into the corresponding minimizing of oxygen of molten steel, T[O in the molten steel] with regard to corresponding reduction, therefore, reduce the SiO in the coverture
2Content, the basicity of increase tundish covering flux can be slowed down SiO
2Generate Si and Al with dissolved aluminum reaction in the steel
2O
3Speed, reduce Si, T[O in the molten steel] increasing degree, and alleviate the erosion degree of coverture to refractory material, improve the cleannes of molten steel.
In addition, when having CaO in the molten slag layer of coverture, [S] in CaO and the molten steel reacts, and the sulphur in the molten steel is removed, and concrete reaction equation is:
Therefore, increase CaO content in the tundish covering flux, improve coverture basicity, can further make the molten steel desulfurizing in the tundish, reach the effect of double refining, the degree of purity of molten steel is improved.
In a word, high basicity tundish covering flux (1) can slow down [Al] reaction in coverture and the molten steel, reduces T[O in the molten steel] content; (2) can make molten steel further desulfurization in tundish; Finally reach the purpose of improving the molten steel degree of purity.
The present invention is primary raw material with the calcium aluminate, allocate other auxiliary material of part again into, through certain procedure, producing with the calcium aluminate is the high basicity tundish covering flux of basis feature, and this kind tundish covering flux can be full particle shape and two kinds of forms of hollow spheres.
High basicity tundish covering flux of the present invention, its composition following (mass percent):
Calcium aluminate 70～90%;
Magnesia 0.1～20%;
Binding agent 0.1～10%;
Additive 0.1～5%.
High basicity tundish covering flux of the present invention also comprises a kind of in calcium carbonate and the quartz sand or several, calcium carbonate 0～25%, quartz sand 0～5%.
Wherein, described calcium aluminate is by 55～70% calcium carbonate and 30～45% bauxites, forms through high melt.
Described binding agent is dextrin, flour or waterglass; Various batchings are bonded together, and make it produce certain intensity.
Described additive is phosphate, ligninsulfonate, citric acid, glycerine, naphthalene water reducer, water-soluble resin class water reducer or ethylene glycol; Wherein, phosphate, ligninsulfonate, naphthalene water reducer, water-soluble resin class water reducer can keep under the constant substantially condition of batching mobile performance, significantly reduce batching mixing water amount, but these materials do not generate new compound with the batching chemically reactive, just play the Surface Physical Chemistry effect; What citric acid, glycerine, ethylene glycol then can delay to prepare burden condenses and firm time.
Beneficial effect of the present invention
The present invention is primary raw material with the calcium aluminate, basicity (CaO/SiO
2〉=6.0) higher, can effectively reduce the total oxygen in the tundish molten steel, can further remove the sulphur in the molten steel in the tundish, and improve the cleannes of molten steel in the tundish, effectively prevent secondary oxidation of steel in the tundish, and then improve slab quality, have good heat-insulating property simultaneously.
Description of drawings
Fig. 1 a, Fig. 1 b are different basicity tundish covering fluxs to total oxygen in the molten steel (T[O]) influence.
Fig. 2 a, Fig. 2 b are that different basicity tundish covering fluxs influence sulphur in the molten steel (S).
Fig. 3 a, Fig. 3 b are the influences of different basicity tundish covering fluxs to the shared observation of field trash visual field area in the steel sample.
Fig. 4 is the 300T converter mill trial results of different basicity tundish covering fluxs to secondary oxidation of steel influence in the tundish.
Fig. 5 a, Fig. 5 b are the result of the tests of 300T converter pilot production tundish covering flux heat-insulating property.
The specific embodiment
The embodiment of high basicity tundish covering flux of the present invention and comparative example are referring to table 2.
Table 2
| Embodiment | Composition (mass percent) | Basicity | Result of use | |||||||||
| Calcium aluminate | Calcium carbonate | Magnesia | Quartz sand | Binding agent | | Lining wear | ||||||
| 1 | 87.1 | 3.9 | 0.1 | 1.9 | 6.0 | 1.0 | 8.51 | Not serious | ||||
| 2 | 89.9 | 0.3 | 2.2 | 4.5 | 1.7 | 1.4 | 6.00 | Not serious | ||||
| 3 | 71.2 | 24.1 | 0.8 | 3.0 | 0.1 | 0.8 | 10.71 | Not serious | ||||
| 4 | 72.3 | 3.6 | 14.2 | 0.7 | 9.1 | 0.1 | 12.10 | Not serious | ||||
| 5 | 73.5 | 21.3 | 2.8 | 0.9 | 0.3 | 1.2 | 11.18 | Not serious | ||||
| 6 | 75.5 | 7.2 | 11.0 | 1.1 | 3.0 | 2.2 | 16.48 | Not serious | ||||
| 7 | 77.2 | 16.2 | 1.5 | 4.2 | 0.4 | 0.5 | 8.17 | Not serious | ||||
| 8 | 79.3 | 12.3 | 3.1 | 0.2 | 3.5 | 1.6 | 7.05 | Not serious | ||||
| 9 | 80.1 | 9.7 | 3.6 | 1.4 | 1.1 | 4.1 | 12.74 | Not serious | ||||
| 10 | 82.3 | 2.5 | 10.2 | 2.1 | 2.7 | 0.2 | 10.47 | Not serious | ||||
| 11 | 76.6 | 11.9 | 7.7 | 0.0 | 0.8 | 3.0 | 9.87 | Not serious | ||||
| 12 | 81.0 | 4.0 | 9.3 | 3.2 | 2.1 | 0.4 | 8.69 | Not serious | ||||
| CaO | Al 2O 3 | MgO | SiO 2 | Other | Basicity | Lining wear | ||||||
| Comparative example 1 | 38.2 | 4.86 | 10.94 | 25.66 | 20.34 | 1.49 | More serious | |||||
| Comparative example 2 | 35.22 | 4.93 | 0.72 | 37.05 | 22.08 | 0.95 | Seriously | |||||
| Comparative example 3 | 36.32 | 5.95 | 15.38 | 27.85 | 14.5 | 1.30 | Seriously | |||||
Wherein, binding agent is dextrin, flour; Additive is wooden calcium sulfonate, sodium phosphate.
Fig. 1 a, Fig. 1 b are different basicity tundish covering fluxs to total oxygen in the molten steel (T[O]) influence, wherein Fig. 1 a is a 100Kg non-vacuum induction furnace result of the test, Fig. 1 b is a 300T converter mill trial results, as can be seen from Figure, coverture of the present invention can effectively reduce total oxygen in the tundish molten steel (T[O]).
Fig. 2 a, Fig. 2 b are that different basicity tundish covering fluxs influence sulphur in the molten steel (S), wherein Fig. 2 a is a 100Kg non-vacuum induction furnace result of the test, and Fig. 2 b is a 300T converter mill trial results, as can be seen from Figure, coverture of the present invention can prevent that molten steel from returning sulphur, and certain desulfidation is arranged.
Fig. 3 a, Fig. 3 b are the influences of different basicity tundish covering fluxs to the shared observation of field trash visual field area in the steel sample, wherein Fig. 3 a is a 100Kg non-vacuum induction furnace result of the test, Fig. 3 b is a 300T converter mill trial results, as can be seen from Figure, coverture of the present invention can improve the cleannes of molten steel in the tundish.
Fig. 4 is the 300T converter mill trial results of different basicity tundish covering fluxs to secondary oxidation of steel influence in the tundish, and as can be seen from Figure, coverture of the present invention can effectively prevent secondary oxidation of steel in the tundish.
Fig. 5 a, Fig. 5 b are 300T converter pilot production tundish covering flux heat-insulating property result of the tests, and wherein Fig. 5 a is test for the first time, and Fig. 5 b is test for the second time, and as can be seen from Figure, coverture of the present invention has good heat-insulating property.
High basicity tundish covering flux of the present invention (embodiment 1～12) carries out service test with the tundish covering flux (comparative example 1,2,3) of original low basicity.Use respectively under identical condition, coverture of the present invention does not corrode furnace lining, and is little to the pollution level of molten steel, has desulfurization significantly, suppresses the effect that molten steel returns sulphur.
In sum, coverture of the present invention can effectively reduce the total oxygen in the tundish molten steel, can further remove the sulphur in the molten steel in the tundish, and improve the cleannes of molten steel in the tundish, effectively prevent secondary oxidation of steel in the tundish, and then improve slab quality, have good heat-insulating property simultaneously.
Claims (4)
1. high basicity tundish covering flux, its composition quality percentage is:
Calcium aluminate 70～90%;
Magnesia 0.1～20%;
Binding agent 0.1～10%;
Additive 0.1～5%.
2. high basicity tundish covering flux as claimed in claim 1 is characterized in that, also comprises a kind of in calcium carbonate and the quartz sand or several, calcium carbonate 0～25%, quartz sand 0～5%, by mass percentage.
3. high basicity tundish covering flux as claimed in claim 1 is characterized in that described calcium aluminate comprises calcium carbonate 55～70%, bauxite 30～45%, by mass percentage.
4. high basicity tundish covering flux as claimed in claim 1 is characterized in that described binding agent is dextrin, flour or waterglass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100165918A CN1308101C (en) | 2004-02-26 | 2004-02-26 | Covering agent for pouring basket in high alkalinity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100165918A CN1308101C (en) | 2004-02-26 | 2004-02-26 | Covering agent for pouring basket in high alkalinity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1660520A CN1660520A (en) | 2005-08-31 |
| CN1308101C true CN1308101C (en) | 2007-04-04 |
Family
ID=35010245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100165918A Expired - Fee Related CN1308101C (en) | 2004-02-26 | 2004-02-26 | Covering agent for pouring basket in high alkalinity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1308101C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI403589B (en) * | 2009-04-10 | 2013-08-01 | China Steel Corp | Granular humectant liquid steel and its manufacturing method |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100371105C (en) * | 2006-08-25 | 2008-02-27 | 重庆大学 | Molten steel covering agent and its preparation method |
| CN101618442B (en) * | 2008-07-04 | 2011-08-17 | 上海梅山钢铁股份有限公司 | Reductive covering agent for continuous casting tundish |
| CN101486587B (en) * | 2009-01-04 | 2012-03-21 | 攀钢集团研究院有限公司 | Double-layer tundish covering agent |
| CN102581240B (en) * | 2011-01-11 | 2014-04-30 | 宝山钢铁股份有限公司 | Tundish covering flux |
| CN102744381A (en) * | 2012-07-25 | 2012-10-24 | 洛阳市科丰冶金新材料（集团）有限公司 | High-alkalinity tundish covering agent |
| CN104001884B (en) * | 2013-02-26 | 2016-06-29 | 宝山钢铁股份有限公司 | Covering agent for pouring basket in high alkalinity |
| CN106011383A (en) * | 2016-07-06 | 2016-10-12 | 登封市少林刚玉有限公司 | Processing method of steel-making hollow covering agent with ultra-light weight and low volume density |
| CN106336231B (en) * | 2016-08-29 | 2019-02-12 | 武汉科技大学 | A kind of steel refining whole fire resisting working lining and preparation method thereof |
| CN110102725B (en) * | 2019-05-16 | 2021-03-02 | 鞍山市和丰耐火材料有限公司 | Non-crusting high-magnesium tundish hollow particle covering agent and production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6174347B1 (en) * | 1996-12-11 | 2001-01-16 | Performix Technologies, Ltd. | Basic tundish flux composition for steelmaking processes |
| CN1461680A (en) * | 2002-05-31 | 2003-12-17 | 宝山钢铁股份有限公司 | Tundish covering agent for pure steel, and its making method |
-
2004
- 2004-02-26 CN CNB2004100165918A patent/CN1308101C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6174347B1 (en) * | 1996-12-11 | 2001-01-16 | Performix Technologies, Ltd. | Basic tundish flux composition for steelmaking processes |
| US6179895B1 (en) * | 1996-12-11 | 2001-01-30 | Performix Technologies, Ltd. | Basic tundish flux composition for steelmaking processes |
| CN1461680A (en) * | 2002-05-31 | 2003-12-17 | 宝山钢铁股份有限公司 | Tundish covering agent for pure steel, and its making method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI403589B (en) * | 2009-04-10 | 2013-08-01 | China Steel Corp | Granular humectant liquid steel and its manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1660520A (en) | 2005-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1308101C (en) | Covering agent for pouring basket in high alkalinity | |
| CN1238134C (en) | Tundish covering agent for pure steel, and its making method | |
| CN101358265A (en) | Compound iron melt desulfurizing agent and method of preparing the same | |
| WO2022127017A1 (en) | Special continuous casting crystallizer mold powder for sorbite stainless steel and application thereof | |
| CN101629224A (en) | Deoxidation modification agent of molten steel | |
| CN102071283A (en) | Boron-containing fluorine-free fluxing slag-melting agent for electric steelmaking | |
| CN1415765A (en) | Desulfurizer and its producing technique | |
| CN106495718A (en) | One tank foundry ladle MgO SiC C working lining bricks and preparation method | |
| CN102787213A (en) | Aluminium-calcareous premelted refining slag for low-cost steel-making and method for preparing same | |
| CN101555554A (en) | Copper smelting agent and manufacture process thereof | |
| CN109732048A (en) | Covering slag, preparation method and application for Automobile Plate steel continuous casting crystallizer | |
| CN1730674A (en) | Method for moten iron desulfurization using slag of desulfurized molten iron | |
| CN1528919A (en) | Method for desulfurizing melton iron using desulfurizing agent of containing-aluminium calcium-oxide group | |
| CN1173046C (en) | Aluminium slagging deoxygen ball | |
| CN1540000A (en) | Pre fusion typed refining purifying agent and prducing technique | |
| CN102787210A (en) | Calcareous premelted composite deoxidation and desulfurization agent for low-cost steel-making and method for preparing same | |
| CN101586176A (en) | Calcium based molten iron/semisteel desulfurizing agent and preparation method thereof | |
| CN1238137C (en) | Calcium oxide paint for preventing slag adhearing on steel making container | |
| CN101586175B (en) | Low magnesium type molten iron/semisteel desulfurizing agent and preparation method thereof | |
| CN110452003A (en) | One kind is main Material synthesis refractory brick and preparation method thereof with discarded siliceous mullite brick | |
| CN1527016A (en) | Quick repairing material and its production process | |
| CN102747191A (en) | Molten steel desulfurizer and preparation method thereof | |
| CN1262337A (en) | One-step process for producing SiCaAlBaFe alloy with ore roaster | |
| CN1215086A (en) | Agent for refining and heat-insulating of molten steel surface and its preparation process | |
| CN108754058A (en) | A kind of nano-hot metal composite desulfurizing agent and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070404 Termination date: 20160226 |