CN102351546A - Method for resisting cracking of prefabricated components made of magnesia castable caused by baking - Google Patents
Method for resisting cracking of prefabricated components made of magnesia castable caused by baking Download PDFInfo
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- CN102351546A CN102351546A CN2011101841975A CN201110184197A CN102351546A CN 102351546 A CN102351546 A CN 102351546A CN 2011101841975 A CN2011101841975 A CN 2011101841975A CN 201110184197 A CN201110184197 A CN 201110184197A CN 102351546 A CN102351546 A CN 102351546A
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- magnesia
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Abstract
The invention relates to a method for resisting cracking of prefabricated components made of magnesia castable caused by baking. By processing raw material and changing the variety of the raw material, the method comprises the followings: method A, pretreating magnesite comprising coarse grains with the particle size of 8-1 mm or 5-1 mm by using water to reduce the cracking of the prefabricated components made of magnesia castable; method B, for particles with the particle size of 1-0 mm and fine powder with the fineness of less than 0.088 mm, using high purity magnesite clinker or fused magnesite with grade of no less than 95 comprising more than 95 wt% of MgO to reduce the cracking of the prefabricated components made of magnesia castable; and method C, using 96 siliceous dust comprising no less than 96 wt% of SiO2 with low impurity content to reduce the cracking of the prefabricated components made of magnesia castable; wherein, the method A and method B can be used independently or combinedly, the method C can be used combined with the method A or the method B, or the method A, B, C are used combinedly. By using the method disclosed herein, the occurrence of cracks of produced large-scale magnesia slag-blocked plates and a plurality of current stabilizers (or named as splashproof cylinders) with complicate shapes caused by baking is greatly reduced, and the qualified rate of the products is nearly 100 %.
Description
Technical field
The present invention relates to a kind of magnesia casting material prefabricated anti-baking rimose method.Belong to the pouring fireproof material field.
Background technology
Magnesite refractory have refractoriness height, anti-slag aggressiveness good, also have the effect of purify hot metal concurrently; Thereby in Steel Plant's steelmaking system, use very wide; Especially on tundish, be widely used, great majority such as the pushing off the slag weir plate on the tundish, current stabilizer (or claiming splash-proof canister), strike plate are to use magnesia mould material casting after the baking of 300～400 ℃ of degree temperature forms.These magnesia casting material prefabricated ubiquity cracking phenomenas in bake process; It is big especially that the rimose probability appears in especially large-scale or complex-shaped prefabricated component; Can cause the prefabricated component serious cracking of whole stove when serious and scrap; Not only influenced quality product; And can influence paying down of product; Prestige crisis occurs, and cause very big resource and energy dissipation.Therefore, solve very necessity of magnesia casting material prefabricated anti-this problem of baking cracking.
Held the inorganic materials technology in Huzhou in 2011 and popularize and introduce in the butt joint meeting, Deqing Lituo Metallurgy Material Co., Ltd. will ' solve complete magnesia slag blocking wall cracking problem ' and popularize and introduce as technical barrier.In the online hurdle of " window of anti-material " expert, there is in October, 2006 people advisory consultant ' crack problem appears in magnesia slag weir ' how to solve.The 2nd phase of calendar year 2001 " refractory materials " Wei Yaowu ' SiO
2Micro mist combines the matrix of magnesia mould material to form and slag resistance ' paper in also relate to the baking crack problem of magnesia mould material.2002 the 4th phases paper of " external refractory materials " ' tundish is with the exploitation and the application of alkaline slag weir brick ' has been told about some magnesia slag weir rimose reason and solutions.Some magnesia mould material rimose solutions have been told about from production technique in the paper of Zhao Zi dragon ' magnesia mould material rimose solution ' in the national unshape refractory academic conference in 2009.
Therefore, it is very necessary to solve magnesia casting material prefabricated anti-this problem of baking cracking, has caused insider's extensive attention, but all not can solve, and the inventor intends and proposes magnesia casting material prefabricated new anti-baking rimose method from different perspectives.
Summary of the invention
The object of the present invention is to provide a kind of magnesia casting material prefabricated anti-baking rimose method, the method that is provided comprises following several:
One, (8～1mm or 5～1mm) magnesia carry out pre-treatment and reduce magnesia casting material prefabricated baking cracking water to coarse particles
Approximately contain 2～4% the calcium oxide of having an appointment in the magnesia that calcining of natural ore deposit or electric smelting form, calcium oxide is a kind of very active material, is prone to react with water electrode and produces calcium hydroxide, and its hydration reaction formula is:
CaO+H
2O＝Ca(OH)
2
This process can produce 1.98 times solid volume expansion, and the calcium hydroxide structure that generates is fluffy, and former pore also becomes the gross blow hole in the calcium hydroxide in the calcium oxide, and apparent volume can reach 3～4 times much larger than 1.98 times.This process was accomplished before magnesia casting material prefabricated sclerosis; Then can not produce harm to prefabricated component; But if this process takes place after prefabricated component has hardened; The inner differential expansion that takes place of prefabricated component; Produce very big local stress; Prefabricated component intensity is descended greatly, cause the prefabricated component cracking when serious.
Ordinary sinter magnesia (MgO >=91wt%) because price is relatively cheap, and be used to do magnesia casting material prefabricated main raw material.These magnesia are to form through high-temperature calcination; Structure is fine and close relatively; Calcium oxide as the impurity phase is also burnt closely knit; And be wrapped in the Natural manganese dioxide ore deposit mutually in; Water molecules is difficult to get in its particle; So; Calcium oxide under the normal temperature in the ordinary sinter magnesia is met the water sluggish; Be used in the magnesia mould material to the prefabricated component sclerosis in longer for some time (60 days) aquation fully; And magnesia casting material prefabricated normal temperature preserving period, generally can not surpass 15 days under normal rhythm of production, thereby calcium oxide aquation and cracking fully not.But when baking; Calcium oxide is easy to aquation under the effect of high-temperature water vapor; At the inner differential expansion that produces of hardened prefabricated component, prefabricated component intensity is descended greatly, when the expansion stress that produces causes prefabricated component cracking or collapse during greater than the stretching resistance of prefabricated component.
Therefore the calcium oxide in the ordinary sinter magnesia being carried out prehydration handles; To be to reduce magnesia casting material prefabricated a kind of mode of baking rimose; Concrete grammar is with the air storage of ordinary sinter magnesia raw material; Water every now and then and drench; Use again after 60 days in the magnesia mould material, just can significantly reduce the baking cracking of prefabricated component.(seeing embodiment 1 for details)
Two, middle particle (1～0mm) and fine powder (＜0.088mm=uses the above high-purity magnesite clinker of 95 grades, and (MgO >=95wt%) or electrosmelted magnesite clinker reduce magnesia casting material prefabricated baking cracking;
The middle particle of magnesia and the fine powder of magnesia are because granularity is little, and its calcium oxide more is prone to aquation, more are prone to make magnesia casting material prefabricated baking cracking, handle cumbersome again if also implement prehydration.Therefore can use magnesite clinker or the electrosmelted magnesite clinker of grade more than 95 to substitute ordinary sinter magnesia.
Above magnesite clinker of 95 grades or electrosmelted magnesite clinker can reduce magnesia casting material prefabricated baking rimose reason:
1. because content of magnesia is high, thereby impurity such as calcium oxide is few relatively;
2. the above magnesite clinker of 95 grades all is to adopt two step calcination methods.Common magnesia is to be formed by the ore one-step calcination, in calcination process, because MgCO takes place
3=MgO+CO
2↑ reaction has a large amount of carbonic acid gas to discharge in sintering process, thereby the structure of magnesia is relatively not too fine and close, and calcium oxide wherein is easy to aquation relatively; And the magnesite clinker of two step incinerating more than 95; Be earlier with after the ore calcination one time; Wear into powder, calcine after being pressed into ball again, owing to do not have gas and moisture content eliminating during second step calcining; Thereby the magnesia compact structure that burns till; Calcium oxide is not easy to aquation, and in addition, calcium oxide is well-dispersed in the Natural manganese dioxide when abrasive dust; Be prone to form the solid solution phase of Natural manganese dioxide and calcium oxide when calcining in second step, calcium oxide more is not easy to aquation;
When 3. producing electrosmelted magnesite clinker because temperature is up to more than 2,000 degree during electric smelting, thereby the crystal grain of electrosmelted magnesite clinker is big, and Natural manganese dioxide and the easier formation sosoloid of calcium oxide, calcium oxide also is not easy to aquation.
Three, use the low higher-grade silicon ash of foreign matter content to reduce magnesia casting material prefabricated baking cracking
After the silicon vapor oxidation of discharging through flue when the silicon ash that uses in the refractory materials generally all is smelting commercial silicon and ferro-silicon; Collecting what obtain through dust-precipitator is the product of main component with the soft silica; Owing to be a kind of industry byproduct; Thereby foreign matter content height and complicated component, wherein SiO
2Account for 75～98%, contain the not oxidized Pure Silicon Metal of few part sometimes.
Pure Silicon Metal reacts with water at normal temperatures hardly, but can meet the following reaction of water generation under the normal temperature alkaline condition or under the high temperature:
Si+2OH
-+4H
2O＝＝SiO
3 2-+2H
2↑+3H
2O
Or Si+3H
2O=H
2SiO
3+ 2H
2↑
The same characteristics of these reactions are releasing hydrogen gas, if just do not concentrate reaction before the sclerosis fully at magnesia casting material prefabricated, can produce the maintenance crackle; Toast crackle if when toasting for magnesia casting material prefabricated, concentrate reaction to produce.
Therefore, in order to reduce magnesia casting material prefabricated cracking, should use silicon of high grade ash, the foreign matter content in the silicon ash is low so as far as possible, and correspondingly the content of silicon also can be high, just can not produce too much hydrogen and causes prefabricated component and ftracture.
In sum, (1) a kind of magnesia casting material prefabricated anti-baking rimose method is characterized in that there are following three kinds through to raw-material processing with change raw-material grade:
Method 1. water is carried out pre-treatment to 8～1mm or 5～1mm coarse particles magnesia and is reduced magnesia casting material prefabricated cracking;
2. method uses high-purity magnesite clinker or the electrosmelted magnesite clinker of MgO >=95wt% grade more than 95 to reduce magnesia casting material prefabricated cracking for 1～0mm particle and＜0.088mm fine powder;
3. method uses the low SiO of foreign matter content
2Content>=96wt%96 silicon ash reduces magnesia casting material prefabricated cracking;
2. 1. method used separately with method or united use;
Method 3. with method 1. or method 2. unite and use or 1., 2. and 3. method unites use;
(2) 1. method is used separately, makes magnesia casting material prefabricated baking cracking ratio reduce to 25% from 46%;
(3) 2. method is used separately, makes magnesia casting material prefabricated baking cracking ratio reduce to 24% from 52%;
(4) 1., 2. and 3. method unites use, makes magnesia mould material baking cracking ratio reduce to 0% from 18%.
Method provided by the invention, the probability that occurs crackle when magnesia prefabricated component is toasted reduces greatly, and product percent of pass almost reaches 100%.
Embodiment
Embodiment 1: the ratio batching of according to the form below, pour into each 50 of magnesia slag weirs, and in same stove, toast down in 400 ℃.
It is trapezoidal that the facing of described slag weir is shaped as, and is of a size of: high 900mm; Last hem width 1275mm; Following hem width 900mm; The thick 80mm in top; The thick 70mm in bottom.(following test pour into a mould slag weir all be this size).
Annotate: 92 silicon ashes are meant SiO
2The silicon ash of content>=92% (weight percent), down with.
It is thus clear that, the magnesia coarse particles is carried out prehydration handle, can significantly reduce magnesia casting material prefabricated baking cracking.
Embodiment 2:
Since 95 magnesite clinkers with respect to other high-purity magnesite clinker and electrosmelted magnesite clinker low price many, therefore select middle particle and the fine powder of 95 magnesite clinkers for use as magnesia mould material.The ratio batching of according to the form below pours into each 50 of magnesia slag weirs, in same stove, toasts down in 400 ℃.
Can find out, select for use in 95 magnesite clinkers particle and fine powder very important preventing magnesia casting material prefabricated anti-baking cracking.
Embodiment 3:
Because (SiO2 >=96wt%) price is relatively cheap, and foreign matter content is also lower, therefore selects the wedding agent of 96 silicon ashes as magnesia mould material for use for 96 silicon ash.The ratio batching of according to the form below pours into each 50 of magnesia slag weirs, in 400 ℃ of bakings down of same stove.
Thus it is clear that, select for use silicon ash of high grade can effectively reduce the generation of magnesia casting material prefabricated crackle.
Claims (4)
1. magnesia casting material prefabricated anti-baking rimose method is characterized in that there are following three kinds through to raw-material processing with change raw-material grade:
Method 1. water is carried out pre-treatment to 8～1mm or 5～1mm coarse particles magnesia and is reduced magnesia casting material prefabricated cracking;
2. method uses high-purity magnesite clinker or the electrosmelted magnesite clinker of MgO >=95wt% grade more than 95 to reduce magnesia casting material prefabricated cracking for 1～0mm particle and＜0.088mm fine powder;
3. method uses the low SiO of foreign matter content
2Content>=96wt%96 silicon ash reduces magnesia casting material prefabricated cracking;
2. 1. method used separately with method or united use;
Method 3. with method 1. or method 2. unite and use or 1., 2. and 3. method unites use.
2. by the described method of claim 1, it is characterized in that the pre-treatment of the 1. described coarse particles magnesia of method is with the raw material air storage, water every now and then, use again in the magnesia mould material after 60 days.
3. by the described method of claim 1, it is characterized in that:
A) 1. method is used separately, makes magnesia casting material prefabricated baking cracking ratio reduce to 25% from 46%;
B) 2. method is used separately, makes magnesia casting material prefabricated baking cracking ratio reduce to 24% from 52%;
C) 1., 2. and 3. method unites use, makes magnesia mould material baking cracking ratio reduce to 0% from 18%.
4. by the described method of claim 3, it is characterized in that described prefabricated component is slag weir or splash-proof canister, slag weir is shaped as trapezoidal.
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| CN2011101841975A CN102351546A (en) | 2011-07-01 | 2011-07-01 | Method for resisting cracking of prefabricated components made of magnesia castable caused by baking |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102775173A (en) * | 2012-08-17 | 2012-11-14 | 武汉科技大学 | Heat-insulation magnesium casting material and preparation method thereof |
| CN111217591A (en) * | 2020-02-27 | 2020-06-02 | 鞍山腾泰耐火材料有限公司 | Prefabricated part for inner lining of assembled electric melting furnace and preparation method thereof |
| CN112456973A (en) * | 2020-12-08 | 2021-03-09 | 武汉钢铁集团耐火材料有限责任公司 | Magnesium current stabilizer for tundish and preparation method thereof |
| CN115677384A (en) * | 2022-10-12 | 2023-02-03 | 河南好运祥耐材有限公司 | Protection method for refractory material prefabricated part |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101096294A (en) * | 2006-06-28 | 2008-01-02 | 宝山钢铁股份有限公司 | Method for preventing hydration during preparation of magnesia-containing fire-resistant material sample |
| CN101913888A (en) * | 2010-08-18 | 2010-12-15 | 武汉钢铁(集团)公司 | Pouring material for forsterite tundish slag stop wall and production process thereof |
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2011
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101096294A (en) * | 2006-06-28 | 2008-01-02 | 宝山钢铁股份有限公司 | Method for preventing hydration during preparation of magnesia-containing fire-resistant material sample |
| CN101913888A (en) * | 2010-08-18 | 2010-12-15 | 武汉钢铁(集团)公司 | Pouring material for forsterite tundish slag stop wall and production process thereof |
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| 桂明玺: "中间包用碱性挡渣堰砖的开发与应用", 《国外耐火材料》, no. 4, 31 December 2002 (2002-12-31) * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102775173A (en) * | 2012-08-17 | 2012-11-14 | 武汉科技大学 | Heat-insulation magnesium casting material and preparation method thereof |
| CN111217591A (en) * | 2020-02-27 | 2020-06-02 | 鞍山腾泰耐火材料有限公司 | Prefabricated part for inner lining of assembled electric melting furnace and preparation method thereof |
| CN112456973A (en) * | 2020-12-08 | 2021-03-09 | 武汉钢铁集团耐火材料有限责任公司 | Magnesium current stabilizer for tundish and preparation method thereof |
| CN112456973B (en) * | 2020-12-08 | 2022-06-28 | 武汉钢铁集团耐火材料有限责任公司 | Magnesium current stabilizer for tundish and preparation method thereof |
| CN115677384A (en) * | 2022-10-12 | 2023-02-03 | 河南好运祥耐材有限公司 | Protection method for refractory material prefabricated part |
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Address after: 201908, No. 8358, Lane 15, Shanghai Baoshan District Road, Shanghai Applicant after: Shanghai Career Metallurgical Furnace Co., Ltd. Co-applicant after: Pengpu Special Refractory Factory, Shanghai Address before: 200072, No. 1183, Lane 155, Shanghai Zhabei District Road, Shanghai Applicant before: Pengpu Special Refractory Factory, Shanghai Co-applicant before: Shanghai Career Metallurgical Furnace Co., Ltd. |
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Application publication date: 20120215 |