CN104803687A - Ultralow silicon coating capable of reducing oxygen content of tundish - Google Patents
Ultralow silicon coating capable of reducing oxygen content of tundish Download PDFInfo
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- CN104803687A CN104803687A CN201410038778.1A CN201410038778A CN104803687A CN 104803687 A CN104803687 A CN 104803687A CN 201410038778 A CN201410038778 A CN 201410038778A CN 104803687 A CN104803687 A CN 104803687A
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- tundish
- silicon coating
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- oxygen content
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Abstract
The invention relates to a refractory material, and especially relates to an ultralow silicon coating capable of reducing the oxygen content of tundish. The coating can be directly applied in steelmaking continuous casting tundish casting work liners. The ultralow silicon coating capable of reducing the oxygen content of tundish comprises 70-80wt% of highly pure magnesia with the MgO content of above 98%, 10-20wt% of highly pure calcium hydroxide with the Ca(OH)2 content of above 96.0%, 1-2.5wt% of an organic fiber, and 3-10wt% of a binder adopting zirconium oxychloride. The granularity of calcium hydroxide is smaller than 10[mu]m; and the organic fiber is an organic explosion-proof fiber without Na, K or N. The ultralow silicon coating has the advantages of effective reduction of the oxygen content, good application performance and high cost performance.
Description
Technical field
The present invention relates to a kind of refractory materials, particularly relate to a kind of ultra-low silicon coating that can reduce tundish oxygen level, this coating directly can apply steel-making continuous casting trough casting working lining.
Background technology
Tundish paint silica source mainly contains two aspects.Derive from raw material magnesia on the one hand, when these silicon contact with molten steel, because standard free energy of formation (enthalpy) is higher, be difficult to release oxygen, can not negative impact be caused.Derive from bonding agent on the other hand: mainly silicon sol or silicon powder, or phosphoric acid salt, or vitriol, these bonding agents will produce very important impact, can cause the serious oxygenation of molten steel.For this reason in numerous effective bonding agents, carry out 1600 DEG C of standard freely generateds can calculate, the bonding agent of hypoxemia gesture is selected to carry out material classification performance test, change bonding agent type, there is good hot strength and anti-slag penetrating power, oxide compound in reduction steel can be met and be less than less than the 10 microns abilities be mingled with, cleaning molten steel.To cast 6 stoves or have after 500 minutes and good turn over bag disintegration performance.
Along with improving constantly of requiring steel product quality, the non-metallic inclusion required in molten steel is more few better; Meanwhile, along with the progress of continuous casting process technology, life requirements centre job contract being made to layer material is also more and more higher.Through all technical and economic target comparative analysis, using ultra-low silicon coating can effectively reduce Metal in Tundish oxygen level, is the optimal selection that high-end automobile slab obtains pure molten steel in casting cycle.
Traditional magnesia coating uses silicon powder to combine, phosphoric acid salt does dispersion agent, add part organic fibre or carbon fiber, add the water of 15 ~ 20% at the scene, the tundish permanent liner smearing thickness being not less than 50 DEG C in the bag wall temperature of tundish is about 30mm to 50mm, seasoning maintenance to watering steel platform COG fuel baking to coating more than 1200 DEG C, being cast after 450 minutes and being turned over bag disintegration after 8 hours.
At present, domestic steel mill liner in dundish refractory materials major part all uses resin-bonded or silicate or vitriol in conjunction with dry materials, and most of coating will add a small amount of tri-polyphosphate or hexametaphosphate.Because resin can produce volatilization irritant gas in baking and use procedure, to workman and environmental danger, simultaneously the carbon residue of the hydrogen dissociated that produces after being heated of resin and resin can cause increasing hydrogen to molten steel and carburetting, unfavorable to purifying of steel.
summary of the invention
The object of the present invention is to provide a kind of ultra-low silicon coating that can reduce tundish oxygen level, it is good that this coating has workability, and cost performance is higher.
In order to realize above-mentioned technical purpose, the present invention adopts following technical scheme:
A ultra-low silicon coating for tundish oxygen level can be reduced, be made up of the raw material of following weight per-cent:
The highly-purity magnesite that content of MgO is greater than 98%, 70 ~ 80%;
Ca (OH)
2the High Purity Hydrogen calcium oxide that content is greater than 96.0%, 10 ~ 20%;
Organic fibre, 1 ~ 2.5%;
Bonding agent adopts zirconium oxychloride, and 3 ~ 10%.
The granularity of described calcium hydroxide is less than 10 microns.
Described organic fibre is the organic explosion-proof fiber containing non-Na, K, N.
The present invention is that one both effectively can reduce oxygen level, can have again workability good, the coating that cost performance is higher.The present invention select without silicate, phosphate free, without vitriol combine alkaline coating, silica content is reduced to the tundish work coating of 1.5% by 10%.
In raw material of the present invention: the highly-purity magnesite that content of MgO is greater than 98%, 70 ~ 80%, free SiO
2content is less than 2.0%.Granularity is adopted to be less than 10 microns of calcium hydroxides, its Ca (OH)
2the High Purity Hydrogen calcium oxide that content is greater than 96.0%, weight composition 10 ~ 20%; Calcium hydroxide is the water reducer of coating.Existing common coating all adopts phosphoric acid salt, silicate, vitriol, ADS etc. to make water reducer, and the present invention adopts calcium hydroxide, aquo compound is belonged to and particle is less under normal temperature state, can significantly improve coating plasticity, ensure that good workability, in the high bake stage, discharge the calcium oxide of free state, this calcium oxide has good activity, at pouring temperature 1600 DEG C, and the Al in it and molten steel
2o
3inclusion reaction forms low melting point C
3a, C
2a, C
12a
7, attach on tundish wall, decrease the inclusion of molten steel, simultaneously by following reaction: { CaO}+ [S]={ CaS}+ [O] reduces the sulphur in molten steel, further cleaning molten steel.But calcium hydroxide content increases, the water of constitution causing pyrolytic decomposition to be released increases, and namely rate of weight loss increases, and this results in blacking hole rate increases and bonding strength reduction, and therefore, resistance to fouling and scour resistance reduce.So calcium hydroxide content of the present invention is chosen as 10 ~ 20% of raw material gross weight.
Bonding agent of the present invention adopts zirconium oxychloride, and this is main innovate point of the present invention.Zirconium oxychloride has following features: 8ZrOCl
28H
2o=8ZrO
2+ 16HCl chlorion is pollution-free to molten steel, and zirconium white at high temperature has good erosion resistance.And existing common coating uses MgO-SiO
2-H
2o combines, SiO
2the increase of content, can increase oxygen level when balancing with molten steel, can pollute molten steel.8ZrOCl
28H
2o itself is not containing SiO
2, the SiO in coating
2, derive from raw materials used in bring.More for the basic zirconium chloride containing 8 crystal water, the water that it decomposes out and pyrolysis HCl out more, the void content of coating is caused to increase and bonding strength decline, if but addition is little, the combination that it produces coating is just not enough, cause the erosion of anti-molten steel to reduce, therefore zirconium oxychloride is too much or very few all by unfavorable, and the add-on of zirconium oxychloride of the present invention is 3 ~ 10% of raw material gross weight as well.
Organic fibre in ultra-low silicon coating of the present invention is the organic explosion-proof fiber containing non-Na, K, N, and this is conducive to workability and the raising construction quality of improving coating.
Through checking on probation, ultra-low silicon coating erosion rate of the present invention is low, is 0.4 ~ 0.5 mm/h, common coating 0.5 ~ 1mm/h, decrease the secondary pollution of coating to molten steel, for the inclusion being less than less than 30 microns reduced further in steel provides good basic substance.
Ultra-low silicon coating of the present invention can be used for manual smearing or vibrating forming, determines to use dry type vibrations material or manual coating according to the casting sequence of onsite application.Ultra-low silicon tundish paint of the present invention makes raw material with highly-purity magnesite, the bonding agent adopted can not produce the gas be harmful to human body and molten steel in thermal histories, C, Si, P etc. can not be brought into molten steel in using to be mingled with, so be all environmental protection from the whole process of constructing and use, be applicable to high-end automobile slab in casting cycle, obtain pure molten steel.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
The target component of the target component of the embodiment of the present invention and performance and comparative example and performance are in table 1.The highly-purity magnesite adopted is the magnesite clinker of MgO>98%, and calcium hydroxide is purity is Ca (OH)
2the slaked lime that >96% and granularity are less than 10 μm, zirconium oxychloride is the industrial first grade that purity is greater than 90%, and organic fibre is organic explosion-proof fiber, not containing Na, K, N element.Prepare burden according to table 1 embodiment, in mixer, mix 8 minutes, then, pack, transport to working-yard and construct.When constructing at the scene, material is placed in mixer, adds 15 ~ 20% water of this coating weight, mix 3 minutes and become pug, be then manually applied on tundish, when smearing, require the tundish wall of heat, temperature is 60 ~ 110
0c as well.
Table 1 examples and comparative examples of the present invention
Construction effect, embodiments of the invention 1 to 5, water time rear permanent liner without local dross; Purify hot metal is obvious, significantly reduces Oxygen Content in Liquid Steel, not phosphate-containing; Molten steel oxygen level can be reduced.
The embodiment of the present invention is compared with comparative example, and most marked difference is that comparative example contains silicon ash, resol, wilkinite and tripoly phosphate sodium STPP, and not containing these materials in the embodiment of the present invention.Compare with CaO with MgO, silicon ash, wilkinite and tripoly phosphate sodium STPP are low melting components, antagonism high temperature erosion is unfavorable, and this is the not erosion resistant one of the main reasons of comparative example of siliceous ash, wilkinite and tripoly phosphate sodium STPP, and these material thermodynamic stabilities are significantly than CaO and ZrO simultaneously
2low, therefore, silicon ash, wilkinite and tripoly phosphate sodium STPP also cause molten steel oxygenation and pollute molten steel.Another is exactly resol, before using when baked between long, resol all burns and leaves pore, this cause dope layer density reduce and anti-erosion be deteriorated.And if baking time is too short, pyrolysis is incomplete, and molten steel may be caused to increase hydrogen and carburetting, and this is obviously also the quality being unfavorable for improving steel.
Claims (3)
1. can reduce a ultra-low silicon coating for tundish oxygen level, it is characterized in that: be made up of the raw material of following weight per-cent:
The highly-purity magnesite that content of MgO is greater than 98%, 70 ~ 80%;
Ca (OH)
2the High Purity Hydrogen calcium oxide that content is greater than 96.0%, 10 ~ 20%;
Organic fibre, 1 ~ 2.5%;
Bonding agent adopts zirconium oxychloride, and 3 ~ 10%.
2. the ultra-low silicon coating that can reduce tundish oxygen level according to claim 1, is characterized in that: the granularity of described calcium hydroxide is less than 10 microns.
3. the ultra-low silicon coating that can reduce tundish oxygen level according to claim 1, is characterized in that: described organic fibre is the organic explosion-proof fiber containing non-Na, K, N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410038778.1A CN104803687B (en) | 2014-01-27 | 2014-01-27 | Ultralow silicon coating capable of reducing oxygen content of tundish |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410038778.1A CN104803687B (en) | 2014-01-27 | 2014-01-27 | Ultralow silicon coating capable of reducing oxygen content of tundish |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104803687A true CN104803687A (en) | 2015-07-29 |
| CN104803687B CN104803687B (en) | 2017-02-15 |
Family
ID=53688944
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410038778.1A Active CN104803687B (en) | 2014-01-27 | 2014-01-27 | Ultralow silicon coating capable of reducing oxygen content of tundish |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107129312A (en) * | 2017-05-16 | 2017-09-05 | 武汉科技大学 | A kind of tundish calcareous dry materials and preparation method thereof |
| CN107129313A (en) * | 2017-05-16 | 2017-09-05 | 武汉科技大学 | A kind of continuous casting tundish coating and preparation method thereof |
| CN107382331A (en) * | 2017-06-28 | 2017-11-24 | 常州莱尚纺织品有限公司 | A kind of anti-slag type tundish paint |
| CN112142447A (en) * | 2020-09-22 | 2020-12-29 | 武汉科技大学 | High-performance energy-saving magnesium-based raw material and preparation method thereof |
| CN113416062A (en) * | 2021-07-01 | 2021-09-21 | 武连明 | Fast-burning phosphorus-free low-silicon gunning mix and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1255517A (en) * | 1998-11-30 | 2000-06-07 | 冶金工业部洛阳耐火材料研究院 | Paint for Mg-Ca tundish |
| CN100447109C (en) * | 2007-05-24 | 2008-12-31 | 洛阳鹏飞耐火耐磨材料有限公司 | Ceramics hanging boards of alumina in use for cement kiln, and preparation method |
-
2014
- 2014-01-27 CN CN201410038778.1A patent/CN104803687B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107129312A (en) * | 2017-05-16 | 2017-09-05 | 武汉科技大学 | A kind of tundish calcareous dry materials and preparation method thereof |
| CN107129313A (en) * | 2017-05-16 | 2017-09-05 | 武汉科技大学 | A kind of continuous casting tundish coating and preparation method thereof |
| CN107382331A (en) * | 2017-06-28 | 2017-11-24 | 常州莱尚纺织品有限公司 | A kind of anti-slag type tundish paint |
| CN112142447A (en) * | 2020-09-22 | 2020-12-29 | 武汉科技大学 | High-performance energy-saving magnesium-based raw material and preparation method thereof |
| CN112142447B (en) * | 2020-09-22 | 2022-02-25 | 武汉科技大学 | High-performance energy-saving magnesium-based raw material and preparation method thereof |
| CN113416062A (en) * | 2021-07-01 | 2021-09-21 | 武连明 | Fast-burning phosphorus-free low-silicon gunning mix and preparation method thereof |
| CN113416062B (en) * | 2021-07-01 | 2023-01-03 | 芦贻春 | Fast-burning phosphorus-free low-silicon gunning mix and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104803687B (en) | 2017-02-15 |
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