CN101844933A - Refractory castable for desulfurizing spray gun for pretreating molten iron - Google Patents
Refractory castable for desulfurizing spray gun for pretreating molten iron Download PDFInfo
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- CN101844933A CN101844933A CN 201010179394 CN201010179394A CN101844933A CN 101844933 A CN101844933 A CN 101844933A CN 201010179394 CN201010179394 CN 201010179394 CN 201010179394 A CN201010179394 A CN 201010179394A CN 101844933 A CN101844933 A CN 101844933A
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- mullite
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- andaluzite
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Abstract
The invention provides a refractory castable for a desulfurizing spray gun for pretreating molten iron, which has lower thermal conductivity and higher thermal shock resistance. The invention is characterized in that 10-50% of flint clay and 5-40% of andalusite are added to aggregate, and 2-15% of mullite ultramicro powder is also added to the aggregate. Thus, on the premise of ensuring that the refractory castable has sufficient corrosion resistance and high strength, the invention further reduces the thermal conductivity of the refractory castable, enhances the shock resistance of the refractory matter, reduces the possibility of cracking, prevents cracks from expanding and greatly prolongs the service life of the desulfurizing spray gun from 18 kilns to about 35 kilns.
Description
Technical field
The present invention relates to a kind of refractory castable for desulfurizing spray gun for pretreating molten iron, the lower heat-shock resistance of the thermal conductivity of the refractory castable that provides or rather is better, belongs to fire resisting material field.
Background technology
The hot metal pretreatment spray gun is the functional refractory materials that is applied on metal mixer car or the hot metal ladle molten iron be carried out desulfurization, dephosphorization treatment, with in the high temperature liquid iron in its reeve metal mixer car or the hot metal ladle, uses N by it during use
2Gas is carried CaO, CaC
2, CaF
2Or Na
2CO
3In pulvis molten iron is taken off S, takes off P and replenishes the processing of taking off Si, with the impurity element of the sulphur in reduction or the elimination molten iron, phosphorus, silicon etc.Spray gun structure is that inner core is a steel pipe, outer wrap high-performance mullite matter mould material.Because steel pipe expanded by heating rate was much larger than the refractory materials of outside when spray gun at high temperature dusted agent, refractory materials easily produces the destruction crackle, because of molten iron stirs, the spray gun shake is very violent, easily produces mechanical crackle in the treating processes; Spray gun repeatedly injects, extracts molten iron, and temperature variation Da Yi produces the thermal shock crackle, so the damage form of spray gun is that refractory materials cracks and causes molten iron to ooze to the steel pipe inner core to bore a hole or rupture.
Spray gun is to have good thermal shock resistance with the topmost characteristic of refractory materials, and the erosion performance of good anti-molten iron, scum and enough hot strengths also will be arranged in addition.The mullite material has premium propertiess such as high-melting-point, low-thermal-expansion, anti-erosion, creep resistance, and the spray gun refractory materials that therefore is used for hot metal pretreatment at present all uses mullite to hang down cement deposit material.But along with the continuous increase of all trades and professions to higher-grade, special steel demand, foreign matter contents such as the sulphur in the requirement molten iron, phosphorus are more and more lower, each steel mill generally adopts the consumption that strengthens desulfurization powder and prolongs the target that desulfurization time reaches super low sulfur, phosphorus for this reason, thereby the time that makes desulphurization spray gun handle a stove molten iron was brought up to 30~40 minutes from original about 10 minutes, caused descend significantly the work-ing life of desulphurization spray gun.With Baosteel metal mixer car desulphurization spray gun is example, and the life-span drops to present stove more than 10 by initial average 32 stoves, seriously threatens the ordinary production of steel mill.In order to satisfy the service requirements of steel mill, improve the work-ing life of spray gun, the damage principle that the present invention intends robbing according to the desulfurization spray has been done further improvement to spray gun with refractory materials for condition with use and has been improved.
Summary of the invention
The object of the present invention is to provide a kind of long lifetime refractory castable for molten iron pretreatment spray gun, in the time of the heat-shock resistance, the resistance to fouling that are intended to further improve material the heat conductivity of material is decreased, with the work-ing life of obvious raising desulphurization spray gun.
In order to carry out above-mentioned target, the present invention is achieved through the following technical solutions:
1. the application of mullite super-fine powder
The damage of desulphurization spray gun mainly is that refractory materials cracks and cause that the thermal shock resistance that improves outer field refractory castable can reduce the generation and the expansion of the crackle of refractory materials, the work-ing life of effectively improving spray gun.For this reason, the present invention plans the original mullite fine powder that uses and changes ultra-fine mullite miropowder into, because the particle diameter little (1~10 μ m) of mullite super-fine powder, activity is good, dispersity is high, can promote aluminum oxide and silicon-dioxide original position in the matrix to generate the staggered mullite crystal of needle-like fast as nucleus when spray gun uses, this thermostability and hot strength that the comb spray gun is taken off in raising be highly effective.
In addition, this also has infilling the mullite super-fine powder in mould material, in the construction amount of water that reduces mould material, improve the air hole structure of mould material, make the pore miniaturization, improve the structural strength of mould material, thereby improve the thermal shock resistance of mould material, and therefore can reduce the consumption of cement.
The desulfurization rifle mould material partial properties detection data of table 1 for adding mullite 200 order fine powders and adding the mullite super-fine powder:
Table 1
* the test method of thermal shock described in the table is mould material to be added water stir, and makes the sample of 40mm * 40mm * 160mm, respectively after 110 ℃ * 24h oven dry and 1000 ℃ * 3h, 1400 ℃ * 3h burning, again with sample from 1100 ℃ to water-cooled circular treatment 5 times.
As can be seen from Table 1, add the sample bar of mullite super-fine powder, the more former mullite fine powder of the heat-shock resistance after each Temperature Treatment obviously improves.But too much adding mullite super-fine powder will make the application property of material worsen, and the cost raising, and mullite super-fine powder add-on is very few, can not demonstrate fully its effect again.The mass percent of the adding of mullite super-fine powder of the present invention is 2~15%.
2, the application of flint clay
Spray gun structure is that inner core is a steel pipe, outer wrap mullite mould material.When spray gun inserts in the high temperature liquid iron in molten iron blowing desulfurization, dephosphorization pulvis, the heat of high temperature liquid iron can be delivered to by the refractory materials of outside on the inner steel core pipe, because the rate of expansion after steel pipe is heated is much larger than the refractory materials of outside, refractory materials can be cracked, high temperature liquid iron will penetrate into steel pipe along crackle, and the burn through steel pipe causes whole spray gun to damage.Therefore the thermal conductivity that reduces refractory material outside just can effectively reduce the temperature of steel core and reduce the rate of expansion of steel pipe, thereby can improve whole service life of lance.The present invention substitutes the thermostability that the part mullite reduces the heat conductivity of refractory materials and improves material with flint clay, has played result of use preferably.
Flint clay and mullite raw material belong to the aluminosilicate property mineral together, its Al
2O
3Content is about 45%, SiO
2Content is about 48%, it is by mullite and high silica glass phase composite, thereby high volume stability is fine, volume stability under its high temperature is no less than mullite material, thereby alternative part mullite is as the material of desulphurization spray gun, and itself and mullite are compound as aggregate, and the tiny crack that forms because of the difference of the two coefficient of thermal expansion can improve the thermal shock resistance of material.In addition, there are a large amount of stratiforms crack and hole in its particle, have the ability of the internal stress that produces when absorbing thermal shock because flint clay is a plate crystal,, thereby further improved the heat-shock resistance of mould material.And flint clay compares with mullite, and its thermal conductivity is lower, to reducing rifle core temperature and thermal expansion, prevents that the material cracking from having played effective function.But the Al of flint clay
2O
3Content is low, the aggressiveness of anti-molten iron and slag is poor, thereby can not use in a large number, and available flint clay macrobead substitutes the part mullite particle, the present invention is controlled at 10~50% with the mass percent of the adding of flint clay, preferentially recommends the mass percent of the adding of flint clay to be controlled at 10-30%.
3, the introducing of andaluzite
Andaluzite is a high alumina matter kyanite family refractory raw material in the aluminium silicon series.In refractory raw material, andaluzite is rarely to be present in refractory mineral in the nature with oxide form.It can be directly used in the refractory materials without any processing.The chemical constitution of andaluzite is Al
2O
3Content 55~60%, SiO
2Content 37~42%.Begin to be converted into mullite (80%) and glassy phase SiO according to globule size at 1200~1400 ℃
2(20%).Andaluzite transition process at high temperature is as follows: 3 (Al
2O
3.8iO
2) → 3Al
2O
3.2SiO
2+ SiO
2
Andaluzite is different from other kyanite family mineral (kyanite and sillimanite), superfluous SiO in the andaluzite
2The overwhelming majority is among the mullite crystal, has only small portion to be in the mullite surface.Under the condition of high temperature, the SiO that is softened or liquefies in the mullite crystal
2Can absorb the volume change of the mullite that causes because of temperature variation.This makes the mullite that is obtained by the andaluzite conversion have more high temperature stability performance than the mullite with other feedstock production.
The present invention introduces mass percent in material be 5~40% andaluzite, not only improved the thermal shock resistance of material, and improved the hot strength of material widely, makes spray gun can adapt to the mal-condition of judder when using.The mass percent of the preferential introducing andaluzite of recommending is 5-25%.
According to top explanation, a kind of long lifetime hot metal pretreatment spray gun provided by the invention with refractory material casting material to consist of electrofused mullite (8-0mm) aggregate be 25-40%, flint clay (8-3mm) 10-50%, andaluzite (1-0mm) 5-40%, mullite super-fine powder (1-10 μ m) 2-15%, aluminous cement 1-5%, and 5% alumina powder, 6% white alundum powder and 4% ultrafine silica powder (more than be the quality percentage composition).Described alumina powder, white alundum powder and silicon powder particle diameter≤320 orders, i.e. particle diameter≤45 μ m.The quality percentage composition of electrofused mullite aggregate is 30-40% in the preferential recommendation component.
Refractory castable provided by the invention is by general refractory materials compound method preparation, after preparation, use and add that mass percent constructs as the water of 3-5%, earlier that fine particle material and manosil AS cement is mixed during preparation, mixed evenly back successively add flint clay, andaluzite and electrofused mullite aggregate again behind the mixing required mould material.
This shows, the invention provides that a kind of thermal conductivity is lower, the better refractory castable for desulfurizing spray gun for pretreating molten iron of heat-shock resistance, be characterized in introducing in the aggregate 10~50% flint clay and 5~40% andaluzite.And 2~15% mullite super-fine powder have been added.Thereby guaranteeing that mould material has under enough anti-erosions and the high-intensity condition, further reduce the heat conductivity of refractory materials, improve the thermal shock resistance of refractory materials, reduce the generation of crackle, stop the expansion of crackle, make to bring up to significantly raising about 35 stoves from 18 original stoves the work-ing life of desulphurization spray gun.
Embodiment
Below by specific embodiment and with the characteristic contrast of the refractory castable of present use, further illustrate substantive distinguishing features of the present invention and marked improvement.
The former proportioning in first hurdle of table 2, meaning does not promptly add flint clay, the heat-shock resistance of refractory castable and the actual heat that uses when andaluzite and mullite super-fine powder, former proportioning consist of 70% electrofused mullite aggregate, 12% mullite fine powder (≤40 μ m), 5% alumina powder, 4% white alundum powder, 4% ultrafine silica powder, 5% aluminous cement, embodiment 1 and 2 is that the amount of minimizing electrofused mullite aggregate is 30-40%, and the amount of increase flint clay and andaluzite, and substitute the mullite fine powder with the mullite super-fine powder, obtained good heat-shock resistance and thermal conductivity, thereby improved the life-span of using.
Table 2
Former proportioning | Embodiment 1 | Embodiment 2 | |
Electrofused mullite 8~0mm aggregate | ??70 | ??40 | ??30 |
Flint clay 8~3mm | ??- | ??15 | ??25 |
Andaluzite 1~0mm | ??- | ??15 | ??15 |
Mullite 320 orders | ??12 | ??- | ??- |
Mullite super-fine powder 1-10 μ m | ??- | ??12 | ??12 |
Alumina powder, | ??5 | ??5 | ??5 |
White alundum powder | ??4 | ??6 | ??6 |
Ultrafine silica powder | ??4 | ??4 | ??4 |
Aluminous cement | ??5 | ??3 | ??3 |
Outer amount of water (%) during construction | ??4.8 | ??4.2 | ??4.2 |
110 ℃ * 24h volume density (g/cm 3) | ??2.79 | ??2.62 | ??2.54 |
110 ℃ * 24h folding strength (MPa) | ??14.1 | ??10.3 | ??9.4 |
Bending strength of cement (Mpa) after 110 ℃ of bakings after the sample thermal shock 5 times | ??1.9 | ??3.4 | ??4.2 |
Folding strength survival rate (%) after 110 ℃ of bakings after the sample thermal shock 5 times | ??19.0 | ??33.0 | ??44.7 |
1000 ℃ * 3h folding strength (Mpa) | ??10.6 | ??12.3 | ??11.5 |
Folding strength (Mpa) after 1000 ℃ of burnings after the sample thermal shock 5 times | ??3.9 | ??5.2 | ??6.7 |
Folding strength survival rate (%) after 1000 ℃ of burnings after the sample thermal shock 5 times | ??36.8 | ??42.2 | ??58.3 |
1400 ℃ * 3h folding strength (Mpa) | ??9.8 | ??13.5 | ??12.2 |
Folding strength (Mpa) after 1400 ℃ of burnings after the sample thermal shock 5 times | ??3.3 | ??6.1 | ??5.8 |
Folding strength survival rate (%) after 1400 ℃ of burnings after the sample thermal shock 5 times | ??33.7 | ??45.2 | ??47.5 |
Use at Baosteel metal mixer car desulfurization rifle | 18 stoves | Average 34 stoves | Average 35 stoves |
Claims (5)
1. refractory castable for desulfurizing spray gun for pretreating molten iron, comprise electrofused mullite aggregate, mullite fine powder, alumina powder, white alundum powder, ultrafine silica powder, aluminous cement, it is characterized in that adding flint clay, andaluzite fine powder, replace the mullite fine powder with the mullite super-fine powder, basic composition is:
Electrofused mullite aggregate 25-40%
Flint clay 10-50%
Andaluzite 5-40%
Mullite super-fine powder 2-15%
Alumina powder 5%
White alundum powder 6%
Ultrafine silica powder 4%
Aluminous cement 1-5%
Above-described content is the quality percentage composition.
2. by the described refractory castable of claim 1, it is characterized in that:
1. electrofused mullite aggregate size 8-0mm;
2. flint clay particle diameter 8-3mm;
3. andaluzite particle diameter 1-0mm;
4. mullite super-fine powder particle diameter 1-10 μ m;
5. alumina powder, white alundum powder, ultrafine silica powder≤320 orders, promptly≤45 μ m.
3. by the described refractory castable of claim 1, it is characterized in that basic composition is:
Electrofused mullite aggregate 30-40%
Flint clay 10-30%
Andaluzite 5-25%
Mullite super-fine powder 2-15%
Alumina powder 5%
White alundum powder 6%
Ultrafine silica powder 4%
Aluminous cement 3%
Above-described content is the quality percentage composition.
4. by the described refractory castable of claim 3, it is characterized in that:
1. electrofused mullite aggregate size 8-0mm;
2. flint clay particle diameter 8-3mm;
3. andaluzite particle diameter 1-0mm;
4. mullite super-fine powder particle diameter 1-10 μ m;
5. alumina powder, white alundum powder, ultrafine silica powder≤320 orders, promptly≤45 μ m.
5. by each described refractory castable of claim 1-4, add the water of mass percent when it is characterized in that using as 3-5%.
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Cited By (9)
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CN109020582A (en) * | 2018-09-29 | 2018-12-18 | 武汉钢铁有限公司 | A kind of ladle heat insulation castable and its application |
CN110256055A (en) * | 2019-07-11 | 2019-09-20 | 上海彭浦特种耐火材料厂有限公司 | High-strength heat preservation type refractory material and corresponding refractory product |
CN110668830A (en) * | 2019-09-25 | 2020-01-10 | 上海利尔耐火材料有限公司 | Preparation method of novel mullite-combined light castable |
CN111041146A (en) * | 2019-12-03 | 2020-04-21 | 莱芜钢铁集团新兴液气有限公司 | Refractory material piece and molten iron pretreatment desulfurization spray gun with same |
CN112079643A (en) * | 2020-08-11 | 2020-12-15 | 国电青山热电有限公司 | Refractory castable for coal-fired boiler and preparation method thereof |
CN112939586A (en) * | 2021-04-14 | 2021-06-11 | 邯郸市鑫禧冶金新材料有限公司 | Production method of refractory material for desulfurization spray gun and refractory material |
CN113582674A (en) * | 2021-06-30 | 2021-11-02 | 江苏正达炉料有限公司 | Long-life desulfurization spray gun refractory part and preparation process thereof |
CN114478033A (en) * | 2022-01-06 | 2022-05-13 | 鞍山钢铁冶金炉材科技有限公司 | Long-life permanent lining castable for hot-metal bottle |
CN116553939A (en) * | 2023-05-18 | 2023-08-08 | 河南瑞泰耐火材料科技有限公司 | Lightweight high thermal shock refractory material for cement kiln preheating decomposition zone and preparation method thereof |
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CN1440952A (en) * | 2003-04-01 | 2003-09-10 | 武汉钢铁(集团)公司 | Refractory cast material for desulfurizing gunite |
CN101633577A (en) * | 2008-07-25 | 2010-01-27 | 上海开宝耐火材料有限公司 | Refractory material for molten iron desulphurization spray gun |
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Patent Citations (2)
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CN1440952A (en) * | 2003-04-01 | 2003-09-10 | 武汉钢铁(集团)公司 | Refractory cast material for desulfurizing gunite |
CN101633577A (en) * | 2008-07-25 | 2010-01-27 | 上海开宝耐火材料有限公司 | Refractory material for molten iron desulphurization spray gun |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109020582A (en) * | 2018-09-29 | 2018-12-18 | 武汉钢铁有限公司 | A kind of ladle heat insulation castable and its application |
CN109020582B (en) * | 2018-09-29 | 2021-06-22 | 武汉钢铁有限公司 | Ladle heat-insulating castable and application thereof |
CN110256055A (en) * | 2019-07-11 | 2019-09-20 | 上海彭浦特种耐火材料厂有限公司 | High-strength heat preservation type refractory material and corresponding refractory product |
CN110668830A (en) * | 2019-09-25 | 2020-01-10 | 上海利尔耐火材料有限公司 | Preparation method of novel mullite-combined light castable |
CN111041146A (en) * | 2019-12-03 | 2020-04-21 | 莱芜钢铁集团新兴液气有限公司 | Refractory material piece and molten iron pretreatment desulfurization spray gun with same |
CN112079643A (en) * | 2020-08-11 | 2020-12-15 | 国电青山热电有限公司 | Refractory castable for coal-fired boiler and preparation method thereof |
CN112939586A (en) * | 2021-04-14 | 2021-06-11 | 邯郸市鑫禧冶金新材料有限公司 | Production method of refractory material for desulfurization spray gun and refractory material |
CN113582674A (en) * | 2021-06-30 | 2021-11-02 | 江苏正达炉料有限公司 | Long-life desulfurization spray gun refractory part and preparation process thereof |
CN114478033A (en) * | 2022-01-06 | 2022-05-13 | 鞍山钢铁冶金炉材科技有限公司 | Long-life permanent lining castable for hot-metal bottle |
CN116553939A (en) * | 2023-05-18 | 2023-08-08 | 河南瑞泰耐火材料科技有限公司 | Lightweight high thermal shock refractory material for cement kiln preheating decomposition zone and preparation method thereof |
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