CN108558376A - A kind of low heat conduction high-strength fireproof pour material - Google Patents
A kind of low heat conduction high-strength fireproof pour material Download PDFInfo
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Abstract
The invention discloses a kind of low heat conduction high-strength fireproof pour materials, include the raw material of following weight percent：40~60% micropore alumina aggregate, 5~15% micropore calcium hexaluminate particle, 5~15% alumina hollow ball, 8~15% fused white corundum fine powders, 1~5% raw bauxite fine powder, 3~8% active alpha Al2O3Ultramicro-powder, 3~8% silicon powder, 1~6% silicon carbide micro-powder, 3~8% pure calcium aluminate cement, 0.1~2% sodium tripolyphosphate.Low heat conduction high-strength fireproof pour material of the present invention is suitable for hot-rolling heating furnace water beam and column fire resistant heat preserving serves as a contrast low heat conduction high-strength refractory castable, have the characteristics that thermal coefficient is low, bulk density is small, intensity is high, good thermal shock, temperature in use are high, the heat loss of water-cooling beam of heating furnace and column can effectively be reduced, improve heating quality in stove, reduces energy consumption and cost.
Description
Technical field
The present invention relates to technical field of refractory materials more particularly to a kind of hot-rolling heating furnace water beam and column insulation with low
Heat conduction high-strength fireproof pour material.
Background technology
Stove beam and column are one of important features of walking beam furnace, it is subjected to the whole weight of blank in stove
Amount, and the important task that undertaker's material step-by-step movement is advanced, thus it is guaranteed that stove beam and the mechanical strength under the conditions of column applying working condition
It is most important.Stove beam and strength reduction and deformation under the conditions of column applied at elevated temperature in order to prevent, need to be cold to stove beam and column progress
But, but the cooling of stove beam has not only dissipated a large amount of energy, improves energy cost, and come not to the heat transmission belt of steel billet simultaneously
Profit influences, and reduces the temperature of steel billet support heat-resistant bearer, causes billet surface water cooling " black print ", deteriorate the heated item of blank
Part reduces heating quality.
In order to improve heating steel billet quality, reduce furnace energy consumption, generally use refractory material to heating furnace both at home and abroad
Stove beam has carried out heat insulation bundling with column, and main heat-insulated lining structure has：The integrated poured structure of single layer castable refractory, fire resisting are poured
Material feeding and refractory fiber blanket double-layer structure and multi-layer refractory fibre blanket structure, wherein single layer castable refractory structure is because of thermal insulation
Energy is poor, multi-layer refractory fibre blanket structure easily crystallizes dusting and do not promote and apply.In terms of heat-proof quality, although double-layer structure middle berth
If the very low refractory fiber blanket of thermal coefficient, but outer layer still uses thermal coefficient higher heavy castable, heat insulation
It is not ideal, and thermal stress gradient is excessive in double-layer structure, is easy to cause material interface separation, and structural stability declines,
Even cracking, peeling phenomenon, significantly reduces the heat insulation effect and service life of refractory material.
In order to overcome the problems referred above, low heat conduction castable is by a large amount of development and application, such as the Chinese patent (applying date：
2007.4.17, notification number CN100463880C) a kind of low-density, low heat conduction, heat safe high-alumina lightening casting material are disclosed,
It is by light-weight mullite aggregate, floating bead, quartz, kyanite, silicon powder, alumina powder, pure calcium aluminate cement and fiber group
At bulk density<1.35g/cm3, 1000 DEG C of thermal coefficients<0.3w/mK, but the mechanical properties such as compressive resistance are relatively low, by steel
Cracking failure is easy when base pressure acts on.
Chinese patent (the applying date：2008.5.30, notification number CN101591180A) it discloses a kind of light alkali-resistant refractory and pours
Material feeding, it is constituted by water-reducing agent of calcium lignosulfonate using calcined bauxite in powder, silicon ash, flyash and aluminate cement as matrix,
Bulk density is 1.8~1.9g/cm3, compressive resistance is more than 50MPa, but thermal conductivity is still higher, and 500 DEG C of thermal coefficients are
0.49w/mK is unfavorable for the insulation of water beam and column wrapper material.
Therefore, for insufficient existing for above-mentioned low heat conduction castable, it is necessary to further carry out hot-rolling heating furnace water beam and
Column fire resistant heat preserving serves as a contrast the research of low heat conduction high-strength fireproof pour material, in the feelings for ensureing that castable refractory mechanical property does not reduce
The thermal coefficient of castable is greatly reduced under condition, improves the heat-insulation and heat-preservation ability and mechanical property of water beam and column refractory heat-insulating lining
Can, reaching, which reduces furnace energy consumption, raising heating furnace production efficiency, extension heating furnace water beam and column fire resistant heat preserving lining, uses the longevity
The purpose of life.
Invention content
Based on the above the deficiencies in the prior art, technical problem solved by the invention is to provide a kind of low heat conduction high intensity
Castable refractory, the low heat conduction high-strength fireproof pour material can reduce heating furnace thermal loss, improve thermal efficiency of heating furnace, extend
Heating furnace water beam and column fire resistant heat preserving lining service life etc..
In order to solve the above technical problem, the present invention provides a kind of low heat conduction high-strength fireproof pour materials, including weigh as follows
Measure the raw material of percentage：40~60% micropore alumina aggregate, 5~15% micropore calcium hexaluminate particle, 5~15% oxidation
Aluminium hollow ball, 8~15% fused white corundum fine powders, 1~5% raw bauxite fine powder, 3~8% active alpha-Al2O3Ultramicro-powder, 3~8%
Silicon powder, 1~6% silicon carbide micro-powder, 3~8% pure calcium aluminate cement, 0.1~2% sodium tripolyphosphate.
As a preferred embodiment of the above technical solution, under low heat conduction high-strength fireproof pour material provided by the invention further comprises
Some or all of row technical characteristic：
As an improvement of the above technical solution, the micropore alumina aggregate is grain composition, is specifically included：Weight percent
The micropore alumina aggregate of 5≤granularity ＜ 3mm than 10~15%, 3≤granularity ＜ 1mm that weight percent is 25~35% it is micro-
Hole alumina aggregate, the micropore alumina aggregate for granularity≤1mm that weight percent is 5~10%.
As an improvement of the above technical solution, the micropore calcium hexaluminate grain graininess is 1~0.1mm, and the micropore is flat
Equal aperture≤6 μm.
As an improvement of the above technical solution, the alumina hollow ball granularity is 3~0.2mm.
As an improvement of the above technical solution, the fused white corundum powder particle size≤0.074mm.
As an improvement of the above technical solution, the raw bauxite powder particle size≤0.074mm.
As an improvement of the above technical solution, silicon carbide micro-powder granularity≤5 μm, wherein SiC content >=97%.
Compared with prior art, technical scheme of the present invention has the advantages that：
(1) being applied in combination by micropore alumina aggregate, micropore calcium hexaluminate and alumina hollow ball of the invention, rationally sets
The grading of aggregates for having counted castable forms the microstructure that micropore is combined with hole of holding one's breath, effectively reduces the body of castable
Product density and thermal coefficient, improve the heat-proof quality and thermal shock resistance of castable.
(2) introducing of the micropore calcium hexaluminate with interlaced flat crystal structure not only further reduced castable
Thermal coefficient, and improve the high volume stability and resistance to slag of castable.
(3) by purity height, good crystallinity, reheating shrink it is small, shut more than hole and the application of small fused white corundum fine powder,
The intensity and high-temperature behavior for improving castable, reduce thermal coefficient；Select part raw bauxite fine powder as formed bond,
The dosage of pure calcium aluminate cement and water is reduced, strengthens mullitization reaction, improves the medium temperature intensity of castable；Pass through oxidation
The compound addition of aluminium and silicon powder enhances the mobility of castable, reduces water consumption, improves the institutional framework of castable, simultaneously
Acicular mullite can be formed under high temperature, further improve the high temperature intensity of castable.
(4) by the application of part SiC superfine powders, replace the silicon ash and aquamaine in traditional heating stove Low Cement Castable
Stone swelling agent, is expanded using high-temperature oxydation, is generated mullite by reaction in-situ, is improved the microstructure of castable, improve
The mechanical behavior under high temperature of castable.
Compared with prior art, low heat conduction high-strength fireproof pour material of the invention, not only thermal conductivity is low far below tradition
Cement refractory castable, and the mechanical properties such as intensity can still compare favourably with traditional low-cement refractory pouring material, realize low lead
Heat and the two of high-intensity performance have both, and heating furnace heat loss is reduced to reach, and extend the mesh such as heat-insulation and heat-preservation lining service life
Mark, while the volume of low heat conduction high-strength fireproof pour material of the present invention is close for 1.8~2.0g/cm of degree3, it is that half heavy is resistance to
Fiery castable greatly reduces construction and Safety Risk in Production when application replaces low cement heavy castable refractory.
Above description is only the general introduction of technical solution of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, and in order to allow the above and other objects, features and advantages of the present invention can
It is clearer and more comprehensible, below in conjunction with preferred embodiment, detailed description are as follows.
Specific implementation mode
The following detailed description of the present invention specific implementation mode, as part of this specification, by embodiment come
Illustrate that the principle of the present invention, other aspects of the present invention, feature and its advantage will become apparent by the detailed description.
Embodiment 1
A kind of low heat conduction high-strength refractory castable, its raw material composition and weight percent content are：
40% micropore alumina aggregate, 15% micropore calcium hexaluminate particle, 12% alumina hollow ball, 8% electricity
Molten white fused alumina fine powder, 5% raw bauxite fine powder, 3% active alpha-Al2O3Ultramicro-powder, 8% silicon powder, 3% silicon carbide are micro-
Powder, 5% pure calcium aluminate cement, 1% sodium tripolyphosphate.
Wherein, the micropore alumina aggregate is grain composition, specifically includes 5≤granularity ＜ of weight percent 10%
The micropore alumina aggregate of the micropore alumina aggregate of 3mm, 3≤granularity ＜ 1mm that weight percent is 25%, weight percent are
The micropore alumina aggregate of 5% granularity≤1mm；Micropore average pore size≤10 μm.
The micropore calcium hexaluminate grain graininess is 1~0.1mm, micropore average pore size≤6 μm；The aluminium oxide is empty
Bulbus cordis granularity is 3~0.2mm.
Fused white corundum powder particle size≤the 0.074mm, the raw bauxite powder particle size≤0.074mm；The carbonization
Silicon powder average particle size≤5 μm, wherein SiC content >=97%.
Embodiment 2
A kind of low heat conduction high-strength refractory castable, its raw material composition and weight percent content are：
45% micropore alumina aggregate, 5% micropore calcium hexaluminate particle, 15% alumina hollow ball, 10% electricity
Molten white fused alumina fine powder, 1% raw bauxite fine powder, 5% active alpha-Al2O3Ultramicro-powder, 3% silicon powder, 6% silicon carbide are micro-
Powder, 8% pure calcium aluminate cement, 2% sodium tripolyphosphate.
Wherein, the micropore alumina aggregate is grain composition, specifically includes 5≤granularity ＜ of weight percent 10%
The micropore alumina aggregate of the micropore alumina aggregate of 3mm, 3≤granularity ＜ 1mm that weight percent is 30%, weight percent are
The micropore alumina aggregate of 5% granularity≤1mm；Micropore average pore size≤10 μm.
The micropore calcium hexaluminate grain graininess is 1~0.1mm, micropore average pore size≤6 μm；The aluminium oxide is empty
Bulbus cordis granularity is 3~0.2mm.
Fused white corundum powder particle size≤the 0.074mm, the raw bauxite powder particle size≤0.074mm；The carbonization
Silicon powder average particle size≤5 μm, wherein SiC content >=97%.
Embodiment 3
A kind of low heat conduction high-strength refractory castable, its raw material composition and weight percent content are：
50% micropore alumina aggregate, 10% micropore calcium hexaluminate particle, 5% alumina hollow ball, 8% electric smelting
White fused alumina fine powder, 3% raw bauxite fine powder, 8% active alpha-Al2O3Ultramicro-powder, 4% silicon powder, 2% silicon carbide micro-powder,
8% pure calcium aluminate cement, 2% sodium tripolyphosphate.
Wherein, the micropore alumina aggregate is grain composition, specifically includes 5≤granularity ＜ of weight percent 12%
The micropore alumina aggregate of the micropore alumina aggregate of 3mm, 3≤granularity ＜ 1mm that weight percent is 30%, weight percent are
The micropore alumina aggregate of 8% granularity≤1mm；Micropore average pore size≤10 μm.
The micropore calcium hexaluminate grain graininess is 1~0.1mm, micropore average pore size≤6 μm；The aluminium oxide is empty
Bulbus cordis granularity is 3~0.2mm.
Fused white corundum powder particle size≤the 0.074mm, the raw bauxite powder particle size≤0.074mm；The carbonization
Silicon powder average particle size≤5 μm, wherein SiC content >=97%.
Embodiment 4
A kind of low heat conduction high-strength refractory castable, its raw material composition and weight percent content are：
60% micropore alumina aggregate, 5% micropore calcium hexaluminate particle, 5% alumina hollow ball, 15% electric smelting
White fused alumina fine powder, 2% raw bauxite fine powder, 4% active alpha-Al2O3Ultramicro-powder, 4% silicon powder, 1% silicon carbide micro-powder,
3% pure calcium aluminate cement, 1% sodium tripolyphosphate.
Wherein, the micropore alumina aggregate is grain composition, specifically includes 5≤granularity ＜ of weight percent 15%
The micropore alumina aggregate of the micropore alumina aggregate of 3mm, 3≤granularity ＜ 1mm that weight percent is 35%, weight percent are
The micropore alumina aggregate of 10% granularity≤1mm；Micropore average pore size≤10 μm.
The micropore calcium hexaluminate grain graininess is 1~0.1mm, micropore average pore size≤6 μm；The aluminium oxide is empty
Bulbus cordis granularity is 3~0.2mm.
Fused white corundum powder particle size≤the 0.074mm, the raw bauxite powder particle size≤0.074mm；The carbonization
Silicon powder average particle size≤5 μm, wherein SiC content >=97%.
Above-mentioned low heat conduction high-strength refractory castable is uniformly mixed by above-mentioned raw materials.According to the original described in Examples 1 to 4
Material composition and weight percent, are prepared for low heat conduction high-strength refractory castable, and carried out 160mm × 40mm × 40mm's respectively
It prepares, is detected with after heat treatment through conserving, the bulk density of each sample is in 1.8~2.0g/cm3Between, 110 DEG C × 3h and 1400
DEG C × 3h heat treatment after compression strength difference >=30MPa and 55MPa, thermal coefficient (1000 DEG C)≤0.43W/mK, correlation
It can be substantially better than the same density castable performance indicator of related data report, hot-rolling heating furnace water beam and column heat shield liner can be met
The performance of structure.
Bound, section value and the technological parameter of each raw material and each raw material of the present invention cited by the present invention
Bound, the section value of (such as temperature, time) can realize the present invention, embodiment numerous to list herein.
The above is the preferred embodiment of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, it is noted that for those skilled in the art, without departing from the principle of the present invention, may be used also
To make several improvement and variation, these are improved and variation is also considered as protection scope of the present invention.
Claims (7)
1. a kind of low heat conduction high-strength fireproof pour material, it is characterised in that：Include the raw material of following weight percent：40~60%
Micropore alumina aggregate, 5~15% micropore calcium hexaluminate particle, 5~15% alumina hollow ball, 8~15% electric smelting it is white
Corundum fine powder, 1~5% raw bauxite fine powder, 3~8% active alpha-Al2O3Ultramicro-powder, 3~8% silicon powder, 1~6% carbonization
Silicon powder, 3~8% pure calcium aluminate cement, 0.1~2% sodium tripolyphosphate.
2. low heat conduction high-strength fireproof pour material as described in claim 1, it is characterised in that：The micropore alumina aggregate is
What grade was matched, it specifically includes：Micropore alumina aggregate, the weight percent of 5≤granularity ＜ 3mm of weight percent 10~15% be
The micropore alumina aggregate of 25~35% 3≤granularity ＜ 1mm, the micropore alumina for granularity≤1mm that weight percent is 5~10%
Aggregate.
3. low heat conduction high-strength fireproof pour material as described in claim 1, it is characterised in that：The micropore calcium hexaluminate particle
Granularity is 1~0.1mm, micropore average pore size≤6 μm.
4. low heat conduction high-strength fireproof pour material as described in claim 1, it is characterised in that：The alumina hollow ball granularity
For 3~0.2mm.
5. low heat conduction high-strength fireproof pour material as described in claim 1, it is characterised in that：The fused white corundum fine silt
Degree≤0.074mm.
6. low heat conduction high-strength fireproof pour material as described in claim 1, it is characterised in that：The raw bauxite powder particle size≤
0.074mm。
7. low heat conduction high-strength fireproof pour material as described in claim 1, it is characterised in that：The silicon carbide micro-powder granularity≤
5 μm, wherein SiC content >=97%.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN111995410A (en) * | 2020-08-24 | 2020-11-27 | 武汉钢铁集团耐火材料有限责任公司 | Lightweight moisturizing and heat-insulating pouring material for tundish cover and preparation method thereof |
| CN113636831A (en) * | 2021-09-15 | 2021-11-12 | 武汉钢铁有限公司 | Quick-drying hollow sphere heat-insulation refractory castable |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111018551A (en) * | 2020-01-10 | 2020-04-17 | 山东建筑大学 | Light heat-insulating castable for coke oven coal charging hole cover and preparation and use methods thereof |
| CN111018551B (en) * | 2020-01-10 | 2021-12-07 | 山东建筑大学 | Light heat-insulating castable for coke oven coal charging hole cover and preparation and use methods thereof |
| CN111620708A (en) * | 2020-06-16 | 2020-09-04 | 上海利尔耐火材料有限公司 | Preparation method of novel aluminum-calcium low-density self-flow castable |
| CN111995410A (en) * | 2020-08-24 | 2020-11-27 | 武汉钢铁集团耐火材料有限责任公司 | Lightweight moisturizing and heat-insulating pouring material for tundish cover and preparation method thereof |
| CN113698217A (en) * | 2020-12-24 | 2021-11-26 | 偃师中岳耐火材料有限公司 | Erosion-resistant calcium aluminate castable |
| CN113636831A (en) * | 2021-09-15 | 2021-11-12 | 武汉钢铁有限公司 | Quick-drying hollow sphere heat-insulation refractory castable |
| CN113800894A (en) * | 2021-09-15 | 2021-12-17 | 武汉钢铁有限公司 | Light high-strength refractory castable |
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