CN105294121A - Light refractory aggregate resistant to thermal shock - Google Patents
Light refractory aggregate resistant to thermal shock Download PDFInfo
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- CN105294121A CN105294121A CN201510683358.3A CN201510683358A CN105294121A CN 105294121 A CN105294121 A CN 105294121A CN 201510683358 A CN201510683358 A CN 201510683358A CN 105294121 A CN105294121 A CN 105294121A
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Abstract
The invention discloses a production process of a light refractory aggregate resistant to thermal shock. The production process comprises the steps that by weight, 65-71 parts of alumina, 18-21 parts of fused magnesia, 2-3 parts of quartz sand, 0.5 part of sialon powder, 0.8-1.1 parts of silicon carbide micro-powder, 1.2 parts of 99.9% by mass of alpha-Al2O3 micro-powder, 0.9 part of kyanite micro-powder and 0.3 part of sericite are used as main raw materials, the temperature is kept to be 35 DEG C after uniform ball milling, then 28 parts of Suzhou clay, 0.8-1.1 parts of SDBS foaming agent, 0.5 part of sodium tripolyphosphate and 6 parts of dextrin are added and are continuously and uniformly stirred to prepare mixed slurry; the prepared slurry undergoes casting molding in a mold, demolding is performed after natural drying, the dried wet blank is fired in an electric furnace, firing operation is divided into two steps, heat preservation is carried out for 2 hours, and then a finished product is obtained with cooling of the furnace. The light refractory aggregate has very outstanding thermal shock resistance performance, better water resistance performance, relatively higher strength and good thermal insulation performance.
Description
Technical field
The invention belongs to technical field of refractory materials, be specifically related to a kind of light-weight refractory aggregate and preparation technology thereof of anti-thermal shock.
Background technology
The advantages such as magnesium-aluminum spinel ceramic has fusing point high (2135 DEG C), resistance to chemical attack is better, intensity is high, thermal expansivity is little, can be widely used in the fields such as support of the catalyst, sensor and hot industry.Particularly at fire resisting material field, magnesium-aluminum spinel ceramic can be used for the checker of high strength hot face refractory, ladle sidewall and glass melter regenerator.Along with energy-conserving and environment-protective require to improve constantly, the lightweight magnesium-aluminum spinel refractory materials of high strength, resistant to corrosion, heat insulating three efficacy receives much attention.
The forming hole method of porous light-weight material mainly contains particle packing pore-forming technique, combustionmaterial addition method, foaming etc.Sun Lifeng etc. prepare lightweight magnesium-aluminum spinel refractory materials by adding pore former, and research adds light calcined magnesia to the impact of its performance.Lee is refined waits quietly with magnesite, raw bauxite for raw material, have studied the impact of sintering temperature on its performance by decomposition in situ legal system for lightweight magnesium-aluminum spinel refractory materials.W.Yan etc. for raw material with magnesium basic carbonate, aluminium hydroxide, prepare lightweight magnesium-aluminum spinel refractory materials by high temperature feed material degradation and study the impact of technique on its micro-property and mechanical property.Foaming has that material void content is high, production cost is low and the advantage such as technique is simple, but air hole structure is difficult to control.
Wu prepares light-weight refractory aggregate towards the neat employing foaming that waits, with alumina powder and electrosmelted magnesite clinker for raw material, the air hole structure of analytical sample is carried out by the influence factor of formation of foam and froth stability in research suspension slip system, research shows: to whipping agent add-on be 0.5% (massfraction), control slurry temperature be 10 DEG C time, such light-weight refractory aggregate be suitable as heat-insulating heat-preserving material use.But find in practice, its intensity or on the low side, and the common fault-not water-fast that light-weight refractory aggregate has is not resolved.
The present invention aims to provide a kind of light-weight refractory aggregate and preparation technology thereof of anti-thermal shock, and its thermal shock resistance is very outstanding, and water resistance is better, and intensity is also higher, and heat-proof quality is good.
Summary of the invention
The present invention is directed to shortcoming of the prior art, the light-weight refractory aggregate providing a kind of thermal shock resistance good and preparation technology thereof, its thermal shock resistance is very outstanding, and water resistance is better, and intensity is also higher, and heat-proof quality is good.
Object of the present invention can be achieved through the following technical solutions:
A kind of production technique of light-weight refractory aggregate of anti-thermal shock:
(1) mud is prepared:
According to weight part, by 65-71 part aluminum oxide (particle diameter 2-3 μm), 18-21 part electrosmelted magnesite clinker (particle diameter 5-9 μm), 2-3 part quartz sand (particle diameter is 20 μm), 0.5 part of Sialon powder, 0.8-1.1 part silicon carbide micro-powder (particle diameter is 2-5 μm), 1.2 parts of massfractions are the α-Al of 99.9%
2o
3micro mist (particle diameter is 12 μm), 0.9 part of kyanite micro mist (particle diameter 30-35 μm), sericite 0.3 part (particle diameter 10 μm) is as main raw material, after ball milling is even, keep temperature 35 DEG C, continue to add 28 parts of Suzhou clays, 0.8-1.1 part SDBS whipping agent, 0.5 part of tripoly phosphate sodium STPP, 6 parts of dextrin continue the obtained mud mixed that stirs;
(2) sinter molding
By the mud casting in a mold made, the demoulding after seasoning, dried wet base, at electric kiln roasting, is fired and is divided into 2 steps:
The first step, is raised to 200 DEG C with the raising speed of 5 DEG C/min from room temperature, insulation 10min;
Second step, is raised to 1500 DEG C with the raising speed of 10 DEG C/min from room temperature, and after insulation 2h, furnace cooling both obtained finished product.
The present inventor is surprised to find that, preparation is specifically filled a prescription, and uses specific production technique, can prepare thermal shock resistance very outstanding, and water resistance is better, and intensity is also higher, the light-weight refractory aggregate that heat-proof quality is good.
Usefulness of the present invention is:
(1) light-weight refractory aggregate of the present invention, its thermal shock resistance is very outstanding, and quality is light, and void content is high, and intensity is large.
(2) the present invention is optimized from composition of raw materials, comprises the component of material, the selection of particle diameter, and obtained light-weight refractory aggregate performance is good.
(3) the present invention is also optimized from sintering process, and carried out two-step method insulation shaping, this measure can increase substantially.
Embodiment
embodiment 1:
The production technique of the light-weight refractory aggregate of anti-thermal shock:
(1) mud is prepared:
According to weight part, by 65 parts of aluminum oxide (particle diameter 3 μm), 18 parts of electrosmelted magnesite clinkers (particle diameter 9 μm), 2 parts of quartz sands (particle diameter is 20 μm), 0.5 part of Sialon powder, 1.1 parts of silicon carbide micro-powders (particle diameter is 2 μm), 1.2 parts of massfractions are the α-Al of 99.9%
2o
3micro mist (particle diameter is 12 μm), 0.9 part of kyanite micro mist (particle diameter 35 μm), sericite 0.3 part (particle diameter 10 μm) is as main raw material, after ball milling is even, keep temperature 35 DEG C, continue to add 28 parts of Suzhou clays, 0.8 part of SDBS whipping agent, 0.5 part of tripoly phosphate sodium STPP, 6 parts of dextrin continue the obtained mud mixed that stirs;
(2) sinter molding
By the mud casting in a mold made, the demoulding after seasoning, dried wet base, at electric kiln roasting, is fired and is divided into 2 steps:
The first step, is raised to 200 DEG C with the raising speed of 5 DEG C/min from room temperature, insulation 10min;
Second step, is raised to 1500 DEG C with the raising speed of 10 DEG C/min from room temperature, and after insulation 2h, furnace cooling both obtained finished product.
embodiment 2:
The production technique of the light-weight refractory aggregate of anti-thermal shock:
(1) mud is prepared:
According to weight part, by 71 parts of aluminum oxide (particle diameter 2 μm), 21 parts of electrosmelted magnesite clinkers (particle diameter 5 μm), 3 parts of quartz sands (particle diameter is 20 μm), 0.5 part of Sialon powder, 0.8 part of silicon carbide micro-powder (particle diameter is 5 μm), 1.2 parts of massfractions are the α-Al of 99.9%
2o
3micro mist (particle diameter is 12 μm), 0.9 part of kyanite micro mist (particle diameter 30 μm), sericite 0.3 part (particle diameter 10 μm) is as main raw material, after ball milling is even, keep temperature 35 DEG C, continue to add 28 parts of Suzhou clays, 1.1 parts of SDBS whipping agents, 0.5 part of tripoly phosphate sodium STPP, 6 parts of dextrin continue the obtained mud mixed that stirs;
(2) sinter molding
By the mud casting in a mold made, the demoulding after seasoning, dried wet base, at electric kiln roasting, is fired and is divided into 2 steps:
The first step, is raised to 200 DEG C with the raising speed of 5 DEG C/min from room temperature, insulation 10min;
Second step, is raised to 1500 DEG C with the raising speed of 10 DEG C/min from room temperature, and after insulation 2h, furnace cooling both obtained finished product.
embodiment 3:
The production technique of the light-weight refractory aggregate of anti-thermal shock:
(1) mud is prepared:
According to weight part, by 66 parts of aluminum oxide (particle diameter 3 μm), 19 parts of electrosmelted magnesite clinkers (particle diameter 8 μm), 2 parts of quartz sands (particle diameter is 20 μm), 0.5 part of Sialon powder, 1.0 parts of silicon carbide micro-powders (particle diameter is 3 μm), 1.2 parts of massfractions are the α-Al of 99.9%
2o
3micro mist (particle diameter is 12 μm), 0.9 part of kyanite micro mist (particle diameter 34 μm), sericite 0.3 part (particle diameter 10 μm) is as main raw material, after ball milling is even, keep temperature 35 DEG C, continue to add 28 parts of Suzhou clays, 0.9 part of SDBS whipping agent, 0.5 part of tripoly phosphate sodium STPP, 6 parts of dextrin continue the obtained mud mixed that stirs;
(2) sinter molding
By the mud casting in a mold made, the demoulding after seasoning, dried wet base, at electric kiln roasting, is fired and is divided into 2 steps:
The first step, is raised to 200 DEG C with the raising speed of 5 DEG C/min from room temperature, insulation 10min;
Second step, is raised to 1500 DEG C with the raising speed of 10 DEG C/min from room temperature, and after insulation 2h, furnace cooling both obtained finished product.
embodiment 4:
The production technique of the light-weight refractory aggregate of anti-thermal shock:
(1) mud is prepared:
According to weight part, by 70 parts of aluminum oxide (particle diameter 2 μm), 20 parts of electrosmelted magnesite clinkers (particle diameter 6 μm), 3 parts of quartz sands (particle diameter is 20 μm), 0.5 part of Sialon powder, 0.9 part of silicon carbide micro-powder (particle diameter is 4 μm), 1.2 parts of massfractions are the α-Al of 99.9%
2o
3micro mist (particle diameter is 12 μm), 0.9 part of kyanite micro mist (particle diameter 31 μm), sericite 0.3 part (particle diameter 10 μm) is as main raw material, after ball milling is even, keep temperature 35 DEG C, continue to add 28 parts of Suzhou clays, 1.0 parts of SDBS whipping agents, 0.5 part of tripoly phosphate sodium STPP, 6 parts of dextrin continue the obtained mud mixed that stirs;
(2) sinter molding
By the mud casting in a mold made, the demoulding after seasoning, dried wet base, at electric kiln roasting, is fired and is divided into 2 steps:
The first step, is raised to 200 DEG C with the raising speed of 5 DEG C/min from room temperature, insulation 10min;
Second step, is raised to 1500 DEG C with the raising speed of 10 DEG C/min from room temperature, and after insulation 2h, furnace cooling both obtained finished product.
embodiment 5:
Comparative example 1, do not take step sintering method:
The production technique of the light-weight refractory aggregate of anti-thermal shock:
(1) mud is prepared:
According to weight part, by 67 parts of aluminum oxide (particle diameter 3 μm), 18 parts of electrosmelted magnesite clinkers (particle diameter 7 μm), 2 parts of quartz sands (particle diameter is 20 μm), 0.5 part of Sialon powder, 1.1 parts of silicon carbide micro-powders (particle diameter is 2 μm), 1.2 parts of massfractions are the α-Al of 99.9%
2o
3micro mist (particle diameter is 12 μm), 0.9 part of kyanite micro mist (particle diameter 33 μm), sericite 0.3 part (particle diameter 10 μm) is as main raw material, after ball milling is even, keep temperature 35 DEG C, continue to add 28 parts of Suzhou clays, 0.8 part of SDBS whipping agent, 0.5 part of tripoly phosphate sodium STPP, 6 parts of dextrin continue the obtained mud mixed that stirs;
(2) sinter molding
By the mud casting in a mold made, the demoulding after seasoning, dried wet base, at electric kiln roasting, is raised to 1500 DEG C with the raising speed of 10 DEG C/min from room temperature, and after insulation 3h, furnace cooling both obtained finished product.
embodiment 6:
Comparative example 2, the size controlling of raw material does not fall within the scope of the present invention.
The production technique of the light-weight refractory aggregate of anti-thermal shock:
(1) mud is prepared:
According to weight part, by 69 parts of aluminum oxide (particle diameter 5 μm), 21 parts of electrosmelted magnesite clinkers (particle diameter 12 μm), 2-3 part quartz sand (particle diameter is 20 μm), 0.5 part of Sialon powder, 0.8 part of silicon carbide micro-powder (particle diameter is 9 μm), 1.2 parts of massfractions are the α-Al of 99.9%
2o
3micro mist (particle diameter is 20 μm), 0.9 part of kyanite micro mist (particle diameter 40 μm), sericite 0.3 part (particle diameter 10 μm) is as main raw material, after ball milling is even, keep temperature 35 DEG C, continue to add 28 parts of Suzhou clays, 1.1 parts of SDBS whipping agents, 0.5 part of tripoly phosphate sodium STPP, 6 parts of dextrin continue the obtained mud mixed that stirs;
(2) sinter molding
By the mud casting in a mold made, the demoulding after seasoning, dried wet base, at electric kiln roasting, is fired and is divided into 2 steps:
The first step, is raised to 200 DEG C with the raising speed of 5 DEG C/min from room temperature, insulation 10min;
Second step, is raised to 1500 DEG C with the raising speed of 10 DEG C/min from room temperature, and after insulation 2h, furnace cooling both obtained finished product.
embodiment 7:
Comparative example 3, according to document " foaming prepares light-weight refractory aggregate ", " glass and enamel ", the 40th volume the 3rd phase, described preferred forms foaming prepares light-weight refractory aggregate.
To the void content of sample, pore mean pore size, ultimate compression strength, water resistance is tested, and result is as shown in the table:
| Void content/% | Pore mean pore size/μm | Ultimate compression strength/MPa | 110 DEG C-water-cooled thermal shock number | |
| Embodiment 1 | 61 | 60 | 36 | 22 |
| Embodiment 2 | 63 | 50 | 45 | 20 |
| Embodiment 3 | 68 | 44 | 38 | 19 |
| Embodiment 4 | 62 | 61 | 50 | 21 |
| Embodiment 5 | 65 | 59 | 28 | 5 |
| Embodiment 6 | 67 | 49 | 31 | 8 |
| Embodiment 7 | 59.92 | 60 | 18 | 3 |
As can be seen here, light-weight refractory aggregate thermal shock resistance of the present invention is very outstanding, and water resistance is better, and intensity is also higher, and heat-proof quality is good.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (3)
1. a production method for the light-weight refractory aggregate of anti-thermal shock, its step is as follows:
(1) mud is prepared:
According to weight part, by 65-71 part aluminum oxide, 18-21 part electrosmelted magnesite clinker, 2-3 part quartz sand, 0.5 part of Sialon powder, 0.8-1.1 part silicon carbide micro-powder, 1.2 parts of massfractions are the α-Al of 99.9%
2o
3micro mist, 0.9 part of kyanite micro mist, sericite 0.3 part is as main raw material, after ball milling is even, keep temperature 35 DEG C, continue to add 28 parts of Suzhou clays, 0.8-1.1 part SDBS whipping agent, 0.5 part of tripoly phosphate sodium STPP, 6 parts of dextrin continue the obtained mud mixed that stirs;
(2) sinter molding
By the mud casting in a mold made, the demoulding after seasoning, dried wet base, at electric kiln roasting, is fired and is divided into 2 steps:
The first step, is raised to 200 DEG C with the raising speed of 5 DEG C/min from room temperature, insulation 10min;
Second step, is raised to 1500 DEG C with the raising speed of 10 DEG C/min from room temperature, and after insulation 2h, furnace cooling both obtained finished product.
2. method according to claim 1, is characterized in that:
Step (1) is:
According to weight part, by 65-71 part aluminum oxide (particle diameter 2-3 μm), 18-21 part electrosmelted magnesite clinker (particle diameter 5-9 μm), 2-3 part quartz sand (particle diameter is 20 μm), 0.5 part of Sialon powder, 0.8-1.1 part silicon carbide micro-powder (particle diameter is 2-5 μm), 1.2 parts of massfractions are the α-Al of 99.9%
2o
3micro mist (particle diameter is 12 μm), 0.9 part of kyanite micro mist (particle diameter 30-35 μm), sericite 0.3 part (particle diameter 10 μm) is as main raw material, after ball milling is even, keep temperature 35 DEG C, continue to add 28 parts of Suzhou clays, 0.8-1.1 part SDBS whipping agent, 0.5 part of tripoly phosphate sodium STPP, 6 parts of dextrin continue the obtained mud mixed that stirs.
3. the light-weight refractory aggregate of the anti-thermal shock that the method described in claim 1-2 prepares.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2642616C1 (en) * | 2017-04-27 | 2018-01-25 | Юлия Алексеевна Щепочкина | Raw mixture for artificial porous aggregate production |
| CN107793165A (en) * | 2017-12-02 | 2018-03-13 | 芜湖乾凯材料科技有限公司 | A kind of anti-erosion cement kiln clinkering zone refractory brick and preparation method thereof |
| CN109160820A (en) * | 2018-09-21 | 2019-01-08 | 佛山齐安建筑科技有限公司 | A kind of light-weight refractory aggregate processing method |
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| CN103951452A (en) * | 2014-05-06 | 2014-07-30 | 郑州大学 | Preparation method of microporous kyanite-based lightweight insulating refractory material |
| CN104909817A (en) * | 2015-06-09 | 2015-09-16 | 辽宁科技大学 | Magnesian porous heat insulating material and preparation method thereof |
| CN104926326A (en) * | 2015-06-10 | 2015-09-23 | 浙江自立股份有限公司 | Al2O3-MgO-SiC-C brick for ladle working linings and preparation method thereof |
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2015
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998055424A1 (en) * | 1997-06-04 | 1998-12-10 | Alliedsignal Inc. | Aluminum oxide-based molding compound |
| CN103951452A (en) * | 2014-05-06 | 2014-07-30 | 郑州大学 | Preparation method of microporous kyanite-based lightweight insulating refractory material |
| CN104909817A (en) * | 2015-06-09 | 2015-09-16 | 辽宁科技大学 | Magnesian porous heat insulating material and preparation method thereof |
| CN104926326A (en) * | 2015-06-10 | 2015-09-23 | 浙江自立股份有限公司 | Al2O3-MgO-SiC-C brick for ladle working linings and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2642616C1 (en) * | 2017-04-27 | 2018-01-25 | Юлия Алексеевна Щепочкина | Raw mixture for artificial porous aggregate production |
| CN107793165A (en) * | 2017-12-02 | 2018-03-13 | 芜湖乾凯材料科技有限公司 | A kind of anti-erosion cement kiln clinkering zone refractory brick and preparation method thereof |
| CN109160820A (en) * | 2018-09-21 | 2019-01-08 | 佛山齐安建筑科技有限公司 | A kind of light-weight refractory aggregate processing method |
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