CN103044044A - Lightweight aluminum oxide castable and preparation method thereof - Google Patents
Lightweight aluminum oxide castable and preparation method thereof Download PDFInfo
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- CN103044044A CN103044044A CN2013100164632A CN201310016463A CN103044044A CN 103044044 A CN103044044 A CN 103044044A CN 2013100164632 A CN2013100164632 A CN 2013100164632A CN 201310016463 A CN201310016463 A CN 201310016463A CN 103044044 A CN103044044 A CN 103044044A
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Abstract
The invention relates to a lightweight aluminum oxide castable and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps of: uniformly mixing 80wt%-90wt% of alpha-Al2O3 fine powder and 10wt%-20wt% of rho-Al2O3 micro-powder or 80wt%-90wt% of commercial alumina fine powder and 10wt%-20wt% of rho-Al2O3 micro-powder, 1wt%-5wt% of pseudo-boehmite micro-powder and 5wt%-10wt% of an expanding agent, which are taken as raw materials, and adding 0.1wt%-1wt% of a water reducer and 15wt%-30wt% of water into the mixture to mix for 3-15 minutes, thus obtaining a mixed material; adding foam prepared from 0.1wt%-1wt% of a foaming agent to the mixed material to stir for 3-5 minutes; and pouring and vibrating the mixed material for molding, and drying the mixed material at 110-150 DEG C for 12-36 hours to obtain the lightweight aluminum oxide castable. The lightweight aluminum oxide castable has the advantages of low production cost, simple process, energy conservation, environment protection, and easiness for large-scale production; and the lightweight aluminum oxide castable is high in porosity, small in mean aperture, high in refractoriness, high in high-temperature strength, low in thermal conductivity and high in resistance to steel slag erosion.
Description
Technical field
The invention belongs to the lightening casting material technical field, be specifically related to a kind of aluminum oxide lightening casting material and preparation method thereof.
Background technology
Energy-saving and emission-reduction are one of economic important measures that keep Sustainable development, and along with the requirement to energy-saving and emission-reduction improves day by day, the research of light heat insulation material is also paid close attention to by people day by day.High-quality light-weight refractory goods requirement high-temperature behavior is good, normal temperature strength is large, thermal conductivity is low and heat-proof quality is good, and then the preparation method of light material is had higher requirement.Aspect the lightweight heat-proof mould material, many scholars have developed vermiculite, perlite, haydite, ultralight aluminum oxide and glass bead mould material, and these lightening casting material thermal conductivitys are lower, can be used as lagging material and use.Yet this class lightening casting material all needs to use aglite as main raw material, the resource-constrained of natural lightweight material, synthetic lightweight material cost is higher, contaminate environment, therefore, the type lightening casting material raw material dependency is high, and cost is high, and technique is comparatively complicated.
At present, in various lightening casting materials, the aluminum oxide lightening casting material becomes the lightening casting material of giving priority to now with the advantage of its high refractoriness, high strength and good heat-insulating and energy-saving effect." a kind of alumina bubble lightweight insulating refractory casting material " (CN 101723687 A) patented technology, the method for preparing aluminum oxide lightweight heat-proof mould material take alumina hollow ball and mullite synthesizing particle as main raw material is disclosed, though the mould material refractoriness height that the method is prepared, but have following shortcoming: (1) raw alumina hollow ball synthesis technique is complicated, and is expensive; (2) use in a large number aluminate cement, reduced its use temperature, increased its preparation cost.The patented technology of " adiabatic mould material is used powder composition and used its adiabatic mould material " (CN 102336575 A), the method that a kind of adiabatic mould material is used powder composition and used its adiabatic mould material is disclosed, though the method heat conduction is lower, but have following shortcoming: (1) uses raw material to be hollow bead, belong to secondary processes, complex process, cost is high; (2) need the high-alumina cement combination, reduced its use temperature, and increased its preparation cost.
Summary of the invention
The present invention is intended to overcome the defective of prior art, and purpose provides that a kind of production cost is low, technique is simple, energy-conserving and environment-protective and be easy to the preparation method of the aluminum oxide lightening casting material of scale operation.The aluminum oxide lightening casting material void content prepared with the method is high, mean pore size is little, refractoriness is high, hot strength is large, thermal conductivity is low and the Slag resistance ability is strong
For achieving the above object, the technical solution adopted in the present invention is: elder generation is with α-Al of 80 ~ 90wt%
2O
3ρ-Al of fine powder and 10 ~ 20wt%
2O
3Micro mist is raw material or with the commercial alumina fine powder of 80 ~ 90wt% and ρ-Al of 10 ~ 20wt%
2O
3Micro mist is raw material, adds the pseudo-boehmite micro mist of described raw material 1 ~ 5wt% and the swelling agent of 5 ~ 10wt%, mixes, and adds the water reducer of described raw material 0.1 ~ 1wt% and the water of 15 ~ 30wt% again, mixes 3 ~ 15min, makes compound; Then add the made foam of whipping agent of described raw material 0.1 ~ 1wt% in the compound, stir 3 ~ 5min, cast vibratory compaction, the base substrate after the moulding is dry 12 ~ 36h under 110 ~ 150 ℃ of conditions, namely gets the aluminum oxide lightening casting material.
In technique scheme: α-Al
2O
3Granularity≤the 0.15mm of fine powder; Granularity≤the 0.15mm of commercial alumina fine powder; ρ-Al
2O
3Granularity≤the 0.088mm of micro mist; Granularity≤the 0.088mm of pseudo-boehmite micro mist; Swelling agent is a kind of in kyanite, andaluzite and the sillimanite, granularity≤0.088mm; Water reducer is more than one in tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and the sodium lignosulfonate.
Owing to adopt technique scheme, the main raw material that the present invention adopts is common aluminum oxide fine powder, need not to use and will expend the alumina hollow ball that mass energy is produced, and technique is simple, and cost is lower, is easy to scale operation; Adopt pseudo-boehmite micro mist and the ρ-Al of non-cement
2O
3Micro mist can both form chain or network-like binding substances with the water reaction at normal temperatures, make mould material not only have preferably middle low-temperature performance, and high-temperature behavior also is enhanced; Owing to add a certain amount of foam, can form more closed pore in addition, optimize its vesicular structure, strengthen its heat-proof quality and mechanical property.
The aluminum oxide lightening casting material that the present invention is prepared: apparent porosity is 25 ~ 40%, volume density 1.6 ~ 2.5g/cm
3, folding strength is 1.0 ~ 5.0MPa.Burn till under 1550 ~ 1650 ℃ of conditions, soaking time is 3 ~ 5h, obtains apparent porosity and be 23 ~ 45%, volume density is 1.6 ~ 2.6g/cm
3With folding strength be the aluminum oxide lightening casting material of 5.0 ~ 20.0MPa, can satisfy well present thermal technology's demand of industrial production.
Therefore, the present invention have need not aglite, non-cement in conjunction with, production cost is low, technique is simple, energy-conserving and environment-protective and the easy advantage of scale operation, prepared aluminum oxide lightening casting material void content height, mean pore size is little, refractoriness is high, hot strength is large, thermal conductivity is low and the Slag resistance ability is strong.
Embodiment
The present invention will be further described below in conjunction with embodiment, is not limiting the scope of the invention.
For avoiding repetition, this embodiment is described below related technical parameter unification first, will not give unnecessary details among the embodiment:
α-Al
2O
3Granularity≤the 0.15mm of fine powder; Granularity≤the 0.15mm of commercial alumina fine powder; ρ-Al
2O
3Granularity≤the 0.088mm of micro mist; Granularity≤the 0.088mm of pseudo-boehmite micro mist; Swelling agent be kyanite, andaluzite and sillimanite granularity all respectively≤0.088mm.
Embodiment 1
A kind of aluminum oxide lightening casting material and preparation method thereof.Elder generation is with α-Al of 80 ~ 82wt%
2O
3ρ-Al of fine powder and 18 ~ 20wt%
2O
3Micro mist is raw material, add the pseudo-boehmite micro mist of described raw material 1 ~ 2wt% and the kyanite of 5 ~ 6wt%, mix, add again Sodium hexametaphosphate 99,0.1 ~ 0.2 sodium lignosulfonate and the water of 15 ~ 19wt% of tripoly phosphate sodium STPP, the 0.25 ~ 0.35wt% of described raw material 0.30 ~ 0.40wt%, mix 3 ~ 15min, make compound; Then add the made foam of whipping agent of described raw material 0.1 ~ 0.3wt% in the compound, stir 3 ~ 5min, cast vibratory compaction, the base substrate after the moulding is dry 12 ~ 36h under 110 ~ 150 ℃ of conditions, namely gets the aluminum oxide lightening casting material.
Adopt the described technical scheme of present embodiment, obtain apparent porosity and be 25 ~ 29%, volume density is 2.2 ~ 2.5g/cm
3With folding strength be the aluminum oxide lightening casting material of 4.2 ~ 5.0MPa.Burn till under 1550 ~ 1650 ℃ of conditions, soaking time is 3 ~ 5h, obtains apparent porosity and be 23 ~ 28%, volume density is 2.3 ~ 2.6g/cm
3With folding strength be the aluminum oxide lightening casting material of 16 ~ 20.0MPa.
Embodiment 2
A kind of aluminum oxide lightening casting material and preparation method thereof.Elder generation is with α-Al of 82 ~ 85wt%
2O
3ρ-Al of fine powder and 15 ~ 18wt%
2O
3Micro mist is raw material, add the pseudo-boehmite micro mist of described raw material 2 ~ 3wt% and the andaluzite of 8 ~ 10wt%, mix, add again the tripoly phosphate sodium STPP of described raw material 0.30 ~ 0.40wt%, the Sodium hexametaphosphate 99 of 0.20 ~ 0.30wt% and the water of 19 ~ 23wt%, mix 3 ~ 15min, make compound; Then add the made foam of whipping agent of described raw material 0.3 ~ 0.5wt% in the compound, stir 3 ~ 5min, cast vibratory compaction, the base substrate after the moulding is dry 12 ~ 36h under 110 ~ 150 ℃ of conditions, namely gets the aluminum oxide lightening casting material.
Adopt the described technical scheme of present embodiment, obtain apparent porosity and be 29 ~ 33%, volume density is 2.0 ~ 2.2g/cm
3With folding strength be the aluminum oxide lightening casting material of 3.0 ~ 4.2MPa.Burn till under 1550 ~ 1650 ℃ of conditions, soaking time is 3 ~ 5h, obtains apparent porosity and be 28 ~ 36%, volume density is 2.0 ~ 2.3g/cm
3With folding strength be the aluminum oxide lightening casting material of 12 ~ 17MPa.
Embodiment 3
A kind of aluminum oxide lightening casting material and preparation method thereof.Elder generation is with α-Al of 85 ~ 87wt%
2O
3ρ-Al of fine powder and 13 ~ 15wt%
2O
3Micro mist is raw material, add the pseudo-boehmite micro mist of described raw material 3 ~ 4wt% and the sillimanite of 6 ~ 8wt%, mix, add again Sodium hexametaphosphate 99,0.2 ~ 0.3 sodium lignosulfonate and the water of 23 ~ 27wt% of described raw material 0.2 ~ 0.3wt%, mix 3 ~ 15min, make compound; Then add the made foam of whipping agent of described raw material 0.5 ~ 0.7wt% in the compound, stir 3 ~ 5min, cast vibratory compaction, the base substrate after the moulding is dry 12 ~ 36h under 110 ~ 150 ℃ of conditions, namely gets the aluminum oxide lightening casting material.
Adopt the described technical scheme of present embodiment, obtain apparent porosity and be 33 ~ 37%, volume density is 1.8 ~ 2.0g/cm
3With folding strength be the aluminum oxide lightening casting material of 1.8 ~ 3.0MPa.Burn till under 1550 ~ 1650 ℃ of conditions, soaking time is 3 ~ 5h, obtains apparent porosity and be 36 ~ 41%, volume density is 1.8 ~ 2.0g/cm
3With folding strength be the aluminum oxide lightening casting material of 8 ~ 12MPa.
Embodiment 4
A kind of aluminum oxide lightening casting material and preparation method thereof.Elder generation is with α-Al of 87 ~ 90wt%
2O
3ρ-Al of fine powder and 10 ~ 13wt%
2O
3Micro mist is raw material, add the pseudo-boehmite micro mist of described raw material 4 ~ 5wt% and the sillimanite of 8 ~ 10wt%, mix, add again tripoly phosphate sodium STPP, 0.2 ~ 0.3 sodium lignosulfonate and the water of 27 ~ 30wt% of described raw material 0.10 ~ 0.20wt%, mix 3 ~ 15min, make compound; Then add the made foam of whipping agent of described raw material 0.7 ~ 1wt% in the compound, stir 3 ~ 5min, cast vibratory compaction, the base substrate after the moulding at dry 12 ~ 36h, namely gets the aluminum oxide lightening casting material 110 ~ 150 ℃ of conditions.
Adopt the described technical scheme of present embodiment, obtain apparent porosity and be 37 ~ 40%, volume density is 1.6 ~ 1.8g/cm
3With folding strength be the aluminum oxide lightening casting material of 1.0 ~ 2.0MPa.Burn till under 1550 ~ 1650 ℃ of conditions, soaking time is 3 ~ 5h, obtains apparent porosity and be 41 ~ 45%, volume density is 1.6 ~ 1.8g/cm
3With folding strength be the aluminum oxide lightening casting material of 5.0 ~ 9.0MPa.
Embodiment 5
A kind of aluminum oxide lightening casting material and preparation method thereof.First with the commercial alumina fine powder of 80 ~ 82wt% and ρ-Al of 18 ~ 20wt%
2O
3Micro mist is raw material, adds the pseudo-boehmite micro mist of described raw material 1 ~ 2wt% and the kyanite of 5 ~ 6wt%, mixes; Add again the tripoly phosphate sodium STPP of described raw material 0.80 ~ 1.00wt% and the water of 15 ~ 19wt%, mix 3 ~ 15min, make compound; Then to the made foam of whipping agent of the 0.1 ~ 0.3wt% of raw material described in the compound, stir 3 ~ 5min, cast vibratory compaction, the base substrate after the moulding is dry 12 ~ 36h under 110 ~ 150 ℃ of conditions, namely gets the aluminum oxide lightening casting material.
Adopt the described technical scheme of present embodiment, obtain apparent porosity and be 25 ~ 29%, volume density is 2.2 ~ 2.5g/cm
3With folding strength be the aluminum oxide lightening casting material of 4.2 ~ 5.0MPa.Burn till under 1550 ~ 1650 ℃ of conditions, soaking time is 3 ~ 5h, obtains apparent porosity and be 23 ~ 28%, volume density is 2.3 ~ 2.6g/cm
3With folding strength be the aluminum oxide lightening casting material of 16 ~ 20.0MPa.
Embodiment 6
A kind of aluminum oxide lightening casting material and preparation method thereof.First with the commercial alumina fine powder of 82 ~ 85wt% and ρ-Al of 15 ~ 18wt%
2O
3Micro mist is raw material, adds the pseudo-boehmite micro mist of described raw material 2 ~ 3wt% and the andaluzite of 8 ~ 10wt%, mixes, and adds the Sodium hexametaphosphate 99 of described raw material 0.60 ~ 0.80wt% and the water of 19 ~ 24wt% again, mixes 3 ~ 15min, makes compound; Then add the made foam of whipping agent of described raw material 0.3 ~ 0.5wt% in the compound, stir 3 ~ 5min, cast vibratory compaction, the base substrate after the moulding is dry 12 ~ 36h under 110 ~ 150 ℃ of conditions, namely gets the aluminum oxide lightening casting material.
Adopt the described technical scheme of present embodiment, obtain apparent porosity and be 29 ~ 33%, volume density is 2.0 ~ 2.2g/cm
3With folding strength be the aluminum oxide lightening casting material of 3.0 ~ 4.2MPa.Burn till under 1550 ~ 1650 ℃ of conditions, soaking time is 3 ~ 5h, obtains apparent porosity and be 28 ~ 36%, volume density is 2.0 ~ 2.3g/cm
3With folding strength be the aluminum oxide lightening casting material of 12 ~ 17MPa.
Embodiment 7
A kind of aluminum oxide lightening casting material and preparation method thereof.First with the commercial alumina fine powder of 85 ~ 87wt% and ρ-Al of 13 ~ 15wt%
2O
3Micro mist is raw material, adds the pseudo-boehmite micro mist of described raw material 3 ~ 4wt% and the sillimanite of 6 ~ 8wt%, mixes, and adds the sodium lignosulfonate of described raw material 0.3 ~ 0.6 and the water of 23 ~ 28wt% again, mixes 3 ~ 15min, makes compound; Then add the made foam of whipping agent of described raw material 0.5 ~ 0.7wt% in the compound, stir 3 ~ 5min, cast vibratory compaction, the base substrate after the moulding is dry 12 ~ 36h under 110 ~ 150 ℃ of conditions, namely gets the aluminum oxide lightening casting material.
Adopt the described technical scheme of present embodiment, obtain apparent porosity and be 33 ~ 37%, volume density is 1.8 ~ 2.0g/cm
3With folding strength be the aluminum oxide lightening casting material of 1.8 ~ 3.0MPa.Burn till under 1550 ~ 1650 ℃ of conditions, soaking time is 3 ~ 5h, obtains apparent porosity and be 36 ~ 41%, volume density is 1.8 ~ 2.0g/cm
3With folding strength be the aluminum oxide lightening casting material of 8 ~ 12MPa.
Embodiment 8
A kind of aluminum oxide lightening casting material and preparation method thereof.First with the commercial alumina fine powder of 87 ~ 90wt% and ρ-Al of 10 ~ 13wt%
2O
3Micro mist is raw material, adds the pseudo-boehmite micro mist of described raw material 4 ~ 5wt% and the sillimanite of 8 ~ 10wt%, mixes, and adds the tripoly phosphate sodium STPP of described raw material 0.10 ~ 0.30wt% and the water of 27 ~ 30wt% again, mixes 3 ~ 15min, makes compound; Then add the made foam of whipping agent of described raw material 0.7 ~ 1wt% in the compound, stir 3 ~ 5min, cast vibratory compaction, the base substrate after the moulding is dry 12 ~ 36h under 110 ~ 150 ℃ of conditions, namely gets the aluminum oxide lightening casting material.
Adopt the described technical scheme of present embodiment, obtain apparent porosity and be 37 ~ 40%, volume density is 1.6 ~ 1.8g/cm
3With folding strength be the aluminum oxide lightening casting material of 1.0 ~ 2.0MPa.Burn till under 1550 ~ 1650 ℃ of conditions, soaking time is 3 ~ 5h, obtains apparent porosity and be 41 ~ 45%, volume density is 1.6 ~ 1.8g/cm
3With folding strength be the aluminum oxide lightening casting material of 5.0 ~ 9.0MPa.
The main raw material that this embodiment adopts is common aluminum oxide fine powder, need not to use and will expend the alumina hollow ball that mass energy is produced, and technique is simple, and cost is lower, is easy to scale operation; Adopt pseudo-boehmite micro mist and the ρ-Al of non-cement
2O
3Micro mist can both form chain or network-like binding substances with the water reaction at normal temperatures, make mould material not only have preferably middle low-temperature performance, and high-temperature behavior also is enhanced; Owing to add a certain amount of foam, can form more closed pore in addition, optimize its vesicular structure, strengthen its heat-proof quality and mechanical property.
The aluminum oxide lightening casting material that this embodiment is prepared: apparent porosity is 25 ~ 40%, volume density 1.6 ~ 2.5g/cm
3, folding strength is 1.0 ~ 5.0MPa.Burn till under 1550 ~ 1650 ℃ of conditions, soaking time is 3 ~ 5h, obtains apparent porosity and be 23 ~ 45%, volume density is 1.6 ~ 2.6g/cm
3With folding strength be the aluminum oxide lightening casting material of 5.0 ~ 20.0MPa, can satisfy well present thermal technology's demand of industrial production.
Therefore, this embodiment have need not aglite, non-cement in conjunction with, production cost is low, technique is simple, energy-conserving and environment-protective and the easy advantage of scale operation, prepared aluminum oxide lightening casting material void content height, mean pore size is little, refractoriness is high, hot strength is large, thermal conductivity is low and the Slag resistance ability is strong.
Claims (8)
1. the preparation method of an aluminum oxide lightening casting material is characterized in that elder generation is with α-Al of 80 ~ 90wt%
2O
3ρ-Al of fine powder and 10 ~ 20wt%
2O
3Micro mist is raw material or with the commercial alumina fine powder of 80 ~ 90wt% and ρ-Al of 10 ~ 20wt%
2O
3Micro mist is raw material, adds the pseudo-boehmite micro mist of described raw material 1 ~ 5wt% and the swelling agent of 5 ~ 10wt%, mixes, and adds the water reducer of described raw material 0.1 ~ 1wt% and the water of 15 ~ 30wt% again, mixes 3 ~ 15min, makes compound; Then add the made foam of whipping agent of described raw material 0.1 ~ 1wt% in the compound, stir 3 ~ 5min, cast vibratory compaction, the base substrate after the moulding is dry 12 ~ 36h under 110 ~ 150 ℃ of conditions, namely gets the aluminum oxide lightening casting material.
2. the preparation method of described aluminum oxide lightening casting material according to claim 1 is characterized in that described α-Al
2O
3Granularity≤the 0.15mm of fine powder.
3. the preparation method of described aluminum oxide lightening casting material according to claim 1 is characterized in that the granularity≤0.15mm of described commercial alumina fine powder.
4. the preparation method of described aluminum oxide lightening casting material according to claim 1 is characterized in that described ρ-Al
2O
3Granularity≤the 0.088mm of micro mist.
5. the preparation method of described aluminum oxide lightening casting material according to claim 1 is characterized in that the granularity≤0.088mm of described pseudo-boehmite micro mist.
6. the preparation method of aluminum oxide lightening casting material according to claim 1 is characterized in that described swelling agent is a kind of in kyanite, andaluzite and the sillimanite, granularity≤0.088mm.
7. the preparation method of aluminum oxide lightening casting material according to claim 1 is characterized in that described water reducer is more than one in tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and the sodium lignosulfonate.
8. the prepared aluminum oxide lightening casting material of preparation method of each described aluminum oxide lightening casting material according to claim 1 ~ 7.
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| CN103242049A (en) * | 2013-05-08 | 2013-08-14 | 绵阳汇丰炉窑材料有限公司 | Foam light refractory casting material and preparation method thereof |
| CN103739299A (en) * | 2013-12-16 | 2014-04-23 | 洛阳利尔耐火材料有限公司 | Fire-resistant self-flow castable |
| CN104788109A (en) * | 2015-04-09 | 2015-07-22 | 河南省宏达炉业有限公司 | High-strength thermal-insulating microporous castable and preparation method thereof |
| CN108101561A (en) * | 2017-12-29 | 2018-06-01 | 武汉科技大学 | A kind of stainless steel smelting pouring materialfor steel ladle and preparation method thereof |
| CN108101562A (en) * | 2017-12-29 | 2018-06-01 | 武汉科技大学 | A kind of potassium steel smelting pouring materialfor steel ladle and preparation method thereof |
| CN108285339A (en) * | 2018-02-12 | 2018-07-17 | 郑州市裕丰耐火材料有限公司 | A kind of foam-formed technique of light-weight refractory prefabricated component |
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| CN108101562A (en) * | 2017-12-29 | 2018-06-01 | 武汉科技大学 | A kind of potassium steel smelting pouring materialfor steel ladle and preparation method thereof |
| CN108101561B (en) * | 2017-12-29 | 2020-12-01 | 武汉科技大学 | Steel ladle castable for stainless steel smelting and preparation method thereof |
| CN108101562B (en) * | 2017-12-29 | 2021-01-01 | 武汉科技大学 | Steel ladle castable for high manganese steel smelting and preparation method thereof |
| CN108285339A (en) * | 2018-02-12 | 2018-07-17 | 郑州市裕丰耐火材料有限公司 | A kind of foam-formed technique of light-weight refractory prefabricated component |
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Application publication date: 20130417 |