CN100463880C - Low-density thermostable high-alumina lightening casting material - Google Patents
Low-density thermostable high-alumina lightening casting material Download PDFInfo
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- CN100463880C CN100463880C CNB2007100395307A CN200710039530A CN100463880C CN 100463880 C CN100463880 C CN 100463880C CN B2007100395307 A CNB2007100395307 A CN B2007100395307A CN 200710039530 A CN200710039530 A CN 200710039530A CN 100463880 C CN100463880 C CN 100463880C
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- casting material
- lightening casting
- low density
- light
- alumina
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Abstract
The invention discloses a high-alumina lightweight injecting material with low density, low heat conductivity and stable high temperature volume and preparing method, which comprises the following steps: allocating mass percent with 26-55% lightweight mullite skeletal material, 5-20% floating pearl, 3-10% quartz, 10-25% blue spar, 2-10% silica micronized flour, 2-10% alpha-Al2O3, 10-25% pure alumina cement and 0. 5-5% fiber; getting the product. This invention possesses low volume density, small heat conductivity at 1000 deg. c and good high temperature volume stability, which can be used for long-period under 1400 deg. c.
Description
Technical field
The present invention relates to a kind of low density, low heat conduction, high volume stable high quality high-alumina lightening casting material and preparation method, make burner operation lining life-time service temperature and can reach 1400 ℃, belong to the unshape refractory field.
Background technology
Lightening casting material is used on each Industrial Stoves and burner widely, but because the contradiction between thermal insulation, intensity and resistance to elevated temperatures, volume density is less than 1.35g/cm usually
3Lightening casting material all make thermal insulation layer in the use occasion more than 1300 ℃ and use, traditional building method is that one deck thermal insulation layer adds the resistant to elevated temperatures heavy refractory materials composition of one deck, this bilayer structure has not only increased the thickness of liner, bring load to device, and construction trouble, especially form weak floors because the difference of material is easy between two-layer, and then cause the separation failure between the two layers of material.For satisfying the demands, the individual layer lining material becomes development trend.
Need possess following characteristics as the individual layer lining material: 1) will reduce thermosteresis as far as possible, improve the heat energy benefit, promptly require material to have lower thermal conductivity; 2) material has enough intensity to bear washing away, rub and corroding of deadweight and opposing hot gas flow; 3) possesses the good high-temperature volume stability.
For this reason, all constantly effort of refractory materials worker are both at home and abroad attempted to improve in above-mentioned several respects overall equilbrium.Developed Al as people such as Shandong, the Shandong anti-ceramic industry Liu Lan of limited liability company beautiful jade, Liu Wei
2O
3Content 45～47%, volume density 1.54～1.58g/cm
3, the lightening casting material of compressive strength 19～30MPa can use on 1350 ℃ of industrial pyrolysis furnaces and receive good effect.People such as Hu Zhihua of Xi'an Technology University has developed volume density at 1.5～1.88g/cm for another example
3Between, ultimate-use temperature is 1350 ℃ a heat insulating casting material.
Yet flourish along with national economy, improving constantly of requirements such as energy-saving and environmental protection requires the volume density of lightening casting material and thermal conductivity lower, and use temperature is higher.Particularly along with the continually developing of novel energy-saving environment-protection combustor, higher requirement is proposed for the refractory castable of burner liner.Its liner of burner of producing as U.S. burner Shanghai branch office requires volume density less than 1.35g/cm
3, 1000 ℃ of thermal conductivities are less than 0.3w/mk, 1400 ℃ * 3hr line velocity of variation 0～+ 0.5% and the high-quality lightweight high alumina castable that can under 1400 ℃ of high temperature, use for a long time, and this burner energy-saving effect is remarkable, and capable of reducing energy consumption 15～20%.
And at present just generally speaking, volume density is less than 1.35g/cm
3Lightening casting material life-time service temperature can only be below 1300 ℃, and after 1300 ℃ * 3hr of hot high temperature thermal treatment, tendencies toward shrinkage is arranged all, can not satisfy the service requirements of advanced burner apparatus.Can solve following problem: 1) volume density be less than 1.35g/cm
3, full temperature territory folding strength is greater than 2.5MPa; 2) thermal conductivity of material under 1000 ℃ of conditions is less than 0.3w/mk; 3) the high volume good stability of material, the line velocity of variation is the microdilatancy situation 0～+ 0.5% after 1400 ℃ * 3hr of high temperature thermal treatment, has become this area problem anxious to be solved, that is needs to break through the common volume density 1.35g/cm that thinks at present
3Following lightening casting material life-time service temperature is lower than 1300 ℃ taboo circle.
The present invention that Here it is is different from the basic point of departure of prior art.
Summary of the invention
The object of the present invention is to provide a kind of good low density, lower thermal conductivity, can make the high-alumina lightening casting material that provides not only can make volume density in the high-alumina lightening casting material and the preparation method of 1400 ℃ of life-time service less than 1.35g/cm
3Condition under, under 1400 ℃ of hot conditionss, be on active service for a long time, its good heat-insulation effect, and have washing away of enough intensity opposing hot gas flow again, reach more than 2 years the work-ing life on heat accumulating type, the first-class burner apparatus of exhaust gas recirculation radiator tube.
The objective of the invention is to reach by following technique means:
1) selection of main raw material: select Al
2O
3The quality percentage composition greater than 60% light-weight mullite aggregate, to float pearl be main raw material, is wedding agent with the pure calcium aluminate cement;
2) use of compound super-fine powder: introduce an amount of ultra-fine SiO
2Micro mist and α-Al
2O
3Micro mist, the intensity of raising material;
3) the swelling agent one compound use of two kinds of quartzy and kyanites, that has kept material has good volume stability and also can produce microdilatancy under middle temperature, high temperature;
4) introduce an amount of filamentary material, make lightening casting material aglite when construction not easily separated, and reduce the volume density of material, raising effect of heat insulation with fine powder.
This shows, the invention is characterized in described a kind of low density, thermostable high-alumina lightening casting material, the quality percentage composition that it is characterized in that described lightening casting material is: light-weight mullite aggregate 26～55%, float pearl 5～20%, quartzy 3～10%, kyanite 10～25%, fine silica powder 2～10%, α-Al
2O
3Micro mist 2～10%, pure calcium aluminate cement 10～25%, fiber 0.5～5%.
Particularly, premium high-alumina lightening casting material provided by the invention is specifically formed percentage ratio and is;
5～3mm light-weight mullite aggregate 5～15%
3～1 light-weight mullite aggregates 20～30%
1～0mm light-weight mullite aggregate 1～10%
＜0.5mm floats pearl 5～20%
＜0.5mm kyanite 10～25%
＜0.5mm quartz 3～10%
Fine silica powder 2～10%
α-Al
2O
3Micro mist 2～10%
Pure calcium aluminate cement 10～25%
Fiber 0.5～5%
From above-mentioned composition, being clear that:
1) in batching, adds light-weight mullite and float two kinds of different aglites of pearl, except the volume density that can make mould material can reduce widely, and make material have the good temperature resistance energy again;
2) by introducing quartzy, two kinds of swelling agents of kyanite, the contraction that mould material is caused because of factors such as amount of water height at the expansion payment light material that relies on quartzy crystalline form to transform generation below 1200 ℃, various fine powders contraction at high temperature in relying on the expansion payment light material of kyanite more than 1200 ℃, and make mould material produce microdilatancy.
3) SiO
2Micro mist and α-Al
2O
3The compound adding of micro mist can improve on the one hand the flowability of mould material, improves the weave construction of mould material and improves intensity; On the other hand, because SiO
2Micro mist and α-Al
2O
3Micro mist at high temperature forms the needle-like mullite and further improves the intensity of mould material, and improves the antistripping of material.
Obviously, SiO
2Micro mist and α-Al
2O
3The adding of micro mist has the raising effect to the volume density of lightening casting material, so the control rationally of its add-on, works as SiO
2The content of micro mist is lower than 2%, and it is not obvious to improve lightening casting material performance and reinforced effects, and when surpassing 10%, then the mould material volume density improves widely, and the high-temperature behavior of material is brought significantly unfavorable.SiO
2The purity of micro mist is wished more than 92%, SiO
2Content too lowly then introduce too much impurity, will influence the high-temperature behavior of material.Fine silica powder and α-Al
2O
3Micro mist was 320 mesh sieves, promptly≤75 μ m.
In addition, add-on quartzy and kyanite also must reasonably be controlled, when quartzy add-on is lower than 3%, and DeGrain, being higher than 10% influences the structure of mould material and reduces intensity and high-temperature behavior.Its granularity is controlled at less than 0.5mm.Kyanite is as the swelling agent under a kind of comparatively high temps, and its add-on is less than 10%, DeGrain, and its add-on influences the various aspects of performance of mould material greater than unusual expansion of 25% material production.
The add-on of fiber has improved the workability and the thermal insulation of mould material effectively, prevented the size segregation of mould material, but the control rationally of its add-on, when being lower than 0.5% DeGrain, when the amount of water that surpasses 5% mould material improves greatly, mobile, intensity obviously reduces.The fiber that the present invention adopts can be organic fibre, paper fiber, glass fibre, C fiber etc., generally selects one or more in these fibers.
Al by low density provided by the invention, thermostable high-alumina lightening casting material
2O
3The quality percentage composition is 50～65%, and the quality percentage composition of CaO is 3～7%, and surplus is SiO
2And unavoidable impurities.Volume density is 1.28～1.35g/cm
3, the line velocity of variation after 1400 ℃ * 3hr pyroprocessing is 0～0.5%.
Preparation technology by low density provided by the invention, heat-resistant light mould material is:
1) each fine powder component is by the described proportioning weighing of claim 1;
2) with SiO
2Micro mist, Al
2O
3In micro mist, pure calcium aluminate cement and fiber and the step 1) less than the fine powder premix of 1mm;
3) with step 2) pre-mixed fine powder mixes with other aggregates greater than 1mm again, and the adding fiber, make to mix.
Embodiment
Further illustrate substantive distinguishing features of the present invention and significant step below by specific embodiment.
Embodiment 1
The Al of the low density that provides, heat-resistant light mould material
2O
3The quality percentage composition is 57.5%, and CaO is 5.8%, and concrete proportioning is 5～3mm light-weight mullite aggregate 12%, 3～1mm light-weight mullite aggregate, 22%, 1～0mm light-weight mullite aggregate 4%,＜0.5mm floats pearl 12%,＜0.5mm kyanite 16%,＜0.5mm quartz 8%, SiO
2Micro mist 4%, α-Al
2O
3Micro mist 6%, pure calcium aluminate cement 20%, paper fiber 0.5%, organic fibre 0.2%.
Weigh earlier by said ratio, with fiber and less than after the pre-mixing of 1.0mm part fine powder again with other particulate material mixing, and fiber is fully broken up.
Embodiment 2
The Al of low density, heat-resistant light mould material is provided
2O
3The quality percentage composition is 50.8%, and CaO is 3.7%, and concrete proportioning is 5～3mm light-weight mullite aggregate 7%, 3～1mm light-weight mullite aggregate, 28%, 1～0mm light-weight mullite aggregate 6%,＜0.5mm floats pearl 12%,＜0.5mm kyanite 12%,＜0.5mm quartz 8%, SiO
2Micro mist 8%, α-Al
2O
3Micro mist 5%, pure calcium aluminate cement 13%, paper fiber 0.5%, organic fibre 2.0%.
Weigh earlier by said ratio, with fiber and less than after the pre-mixing of 1.0mm part fine powder again with other particulate material mixing, and fiber is fully broken up.
Contrast as following table with the existing product performance index after testing:
Claims (6)
1. a low density, thermostable high-alumina lightening casting material is characterized in that the quality percentage composition of described lightening casting material is: light-weight mullite aggregate 26～55%, float pearl 5～20%, quartzy 3～10%, kyanite 10～25%, fine silica powder 2～10%, α-Al
2O
3Micro mist 2～10%, pure calcium aluminate cement 10～25%, fiber 0.5～5%.
2. by the described low density of claim 1, thermostable high-alumina lightening casting material, it is characterized in that Al in the described high-alumina lightening casting material
2O
3The quality percentage composition be 50～65%, the quality percentage composition of CaO is 3～7%, surplus is SiO
2And small amount of impurities.
3. by the described low density of claim 1, thermostable high-alumina lightening casting material, it is characterized in that the light-weight mullite aggregate is a grain composition in the described mould material, specifically be that 5-3mm light-weight mullite aggregate quality percentage composition is 5-15%, 3-1mm light-weight mullite aggregate quality percentage composition is that 20-30%, 1-0mm light-weight mullite aggregate quality percentage composition is 1-10%.
4. by the described low density of claim 1, thermostable high-alumina lightening casting material, it is characterized in that described quartzy particle diameter as the low-temperature expansion agent is less than 0.5mm.
5. by the described low density of claim 1, thermostable high-alumina lightening casting material, it is characterized in that described kyanite granularity as the high temperature swelling agent is less than 0.5mm.
6. by the described low density of claim 1, thermostable high-alumina lightening casting material, it is characterized in that described fiber is one or more of organic fibre, paper fiber, glass fibre, C fiber.
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| CNB2007100395307A CN100463880C (en) | 2007-04-17 | 2007-04-17 | Low-density thermostable high-alumina lightening casting material |
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|---|---|---|---|
| CNB2007100395307A CN100463880C (en) | 2007-04-17 | 2007-04-17 | Low-density thermostable high-alumina lightening casting material |
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| CN101062866A CN101062866A (en) | 2007-10-31 |
| CN100463880C true CN100463880C (en) | 2009-02-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104140273A (en) * | 2013-05-07 | 2014-11-12 | 中国石化工程建设有限公司 | A 1100 DEG C grade low-iron thermally-insulating castable used for industrial furnaces and a preparing method thereof |
| CN107117978A (en) * | 2017-06-30 | 2017-09-01 | 张静芬 | A kind of high-temperature pipe energy-conservation castable |
| CN107200564A (en) * | 2017-06-30 | 2017-09-26 | 张静芬 | A kind of high-strength refractory insulated pouring material |
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| CN101696120B (en) * | 2009-11-05 | 2012-04-18 | 秦皇岛北方管业有限公司 | Metallurgical insulating fireproof material and preparation method |
| CN101792294B (en) * | 2010-03-30 | 2012-05-30 | 武汉钢铁(集团)公司 | Light thermal-shield refractory castable |
| CN102219531B (en) * | 2011-03-22 | 2013-07-03 | 马鞍山江润冶金有限责任公司 | Early-strength quick-drying refractory mud filling material with good insulativity |
| CN102503447B (en) * | 2011-09-23 | 2014-01-01 | 江苏省宜兴非金属化工机械厂有限公司 | Electric cast mullite brick and preparation method thereof |
| CN104140232B (en) * | 2013-05-07 | 2016-08-17 | 中国石化工程建设有限公司 | A kind of 1350 DEG C of level low ferrum heat insulating casting materials used for industrial furnace and preparation method |
| CN104140233B (en) * | 2013-05-07 | 2016-04-06 | 中国石化工程建设有限公司 | A kind of low iron heat insulating casting material of 1200 DEG C of levels used for industrial furnace and preparation method |
| CN104177101A (en) * | 2014-08-20 | 2014-12-03 | 江苏腾天工业炉有限公司 | Formula and manufacturing technique of heavy-weight castable for industrial furnace inner wall |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104140273A (en) * | 2013-05-07 | 2014-11-12 | 中国石化工程建设有限公司 | A 1100 DEG C grade low-iron thermally-insulating castable used for industrial furnaces and a preparing method thereof |
| CN104140273B (en) * | 2013-05-07 | 2016-01-20 | 中国石化工程建设有限公司 | A kind of low iron heat insulating casting material of 1100 DEG C of levels used for industrial furnace and preparation method |
| CN107117978A (en) * | 2017-06-30 | 2017-09-01 | 张静芬 | A kind of high-temperature pipe energy-conservation castable |
| CN107200564A (en) * | 2017-06-30 | 2017-09-26 | 张静芬 | A kind of high-strength refractory insulated pouring material |
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| CN101062866A (en) | 2007-10-31 |
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