CN101844933B - 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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- CN101844933B CN101844933B CN 201010179394 CN201010179394A CN101844933B CN 101844933 B CN101844933 B CN 101844933B CN 201010179394 CN201010179394 CN 201010179394 CN 201010179394 A CN201010179394 A CN 201010179394A CN 101844933 B CN101844933 B CN 101844933B
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- mullite
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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
Hot metal pretreatment is the functional refractory materials that is applied on metal mixer car or the hot metal ladle molten iron is carried out desulfurization, dephosphorization treatment with spray gun, during use it is injected in the high temperature liquid iron in metal mixer car or the hot metal ladle, uses N through it
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 is prone to produce the destruction crackle, because of molten iron stirs, the spray gun shake is very violent, is prone to produce 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 HMP, 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 instructions for use of steel mill, improve the service life of spray gun, the damage principle that the present invention's plan is robbed based on the desulfurization spray supplies condition that spray gun has been done further improvement raising with refractory material with using.
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 realizes through following technical scheme:
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 when spray gun uses, promote aluminum oxide and silicon-dioxide original position in the matrix to generate the staggered mullite crystal of needle-like fast as nucleus, and this thermostability and hot strength that the comb spray gun is taken off in raising is 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.
Table 1 detects data for adding mullite 200 order fine powders with the desulfurization rifle mould material partial properties of adding the mullite super-fine powder:
Table 1
* the TP of thermal shock described in the table is mould material to be added water stir, and processes 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.
Can find out that 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 through the refractory materials of outside on the inner steel core pipe; Because the rate of expansion after steel pipe is heated can crack refractory materials much larger than the refractory materials of outside, 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 heat conductivity and the thermostability that improves material that the part mullite reduces refractory materials 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, and the 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 the refractory mineral in the nature with oxide form.It can directly be used for 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 following: 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 priority 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 the 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 castable refractory of present use, further illustrate substantive distinguishing features of the present invention and marked improvement.
The former proportioning in first hurdle of table 2, the heat-shock resistance of meaning refractory castable when promptly not adding flint clay, andaluzite and mullite super-fine powder and the actual heat that uses, 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 are that the amount of minimizing electrofused mullite aggregate is 30-40%; And the amount of increase flint clay and andaluzite; And, obtained good heat-shock resistance and thermal conductivity, thereby improved the life-span of using with the alternative mullite fine powder of mullite super-fine powder.
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 (3)
1. refractory castable for desulfurizing spray gun for pretreating molten iron; Comprise electrofused mullite aggregate, mullite fine powder, flint clay, andaluzite fine powder; Alumina powder, white alundum powder, ultrafine silica powder, aluminous cement; Replace the mullite fine powder with the mullite super-fine powder, it is characterized in that being grouped into by following one-tenth:
Above-described content is the quality percentage composition;
Wherein, 1. electrofused mullite aggregate size 8-0mm;
2. flint clay particle diameter 8-3mm;
3. andaluzite fine powder 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.
2. by the described refractory castable of claim 1, it is characterized in that being grouped into by following one-tenth:
Above-described content is the quality percentage composition.
3. by claim 1 or 2 each described refractory castablies, add the water of mass percent when it is characterized in that using as 3-5%.
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|---|---|---|---|
| CN 201010179394 CN101844933B (en) | 2010-05-18 | 2010-05-18 | Refractory castable for desulfurizing spray gun for pretreating molten iron |
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|---|---|---|---|
| CN 201010179394 CN101844933B (en) | 2010-05-18 | 2010-05-18 | Refractory castable for desulfurizing spray gun for pretreating molten iron |
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| CN101844933A CN101844933A (en) | 2010-09-29 |
| CN101844933B true CN101844933B (en) | 2012-12-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112939586B (en) * | 2021-04-14 | 2022-08-12 | 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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- 2010-05-18 CN CN 201010179394 patent/CN101844933B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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