CN108675809A - A kind of Ultralight corundum castable and preparation method thereof - Google Patents
A kind of Ultralight corundum castable and preparation method thereof Download PDFInfo
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- CN108675809A CN108675809A CN201810704855.0A CN201810704855A CN108675809A CN 108675809 A CN108675809 A CN 108675809A CN 201810704855 A CN201810704855 A CN 201810704855A CN 108675809 A CN108675809 A CN 108675809A
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- corundum
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
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Abstract
The invention belongs to high-temperature refractory technical field, a kind of Ultralight corundum castable and preparation method thereof is proposed.The raw material of the Ultralight corundum castable of proposition forms and weight percent is：40 80 wt% of corundum bollow ball particle；10 50 wt% of bonding agent；5 15wt% of high temperature sintering agent；0.02 0.50wt% of pore creating material;0.1 1.0 wt% of water-reducing agent；High temperature sintering agent is aluminium oxide Ultramicro-powder, and aluminium oxide Ultramicro-powder is the mixture for one or more of arbitrary proportions that d50 is 5um, 2um, 1um；Bonding agent is pure calcium aluminate cement；There are two kinds of object phases of CaOAl O and CaO2Al O in pure calcium aluminate cement.The present invention has the characteristics that high temperature resistant, thermal and insulating performance are excellent, resistance to reduction atmosphere is good, volume stability is high, with long service life.
Description
Technical field
The invention belongs to high-temperature refractory technical field, a kind of Ultralight corundum castable and its preparation side are related generally to
Method.
Background technology
Corundum castable is mainly to be used as black reactor, height using aluminium oxide as the castable refractory prepared by main material
The inner lining material of the various kilns such as warm gasification furnace, boiler, blast funnace hot blast stove, heating furnace, ceramic kiln is that high temperature industry is common
High-grade refractory material.Corundum bollow ball castable is one kind in corundum castable, temperature in use up to 1600 DEG C -1800 DEG C,
Its main feature is that refractoriness under load is high, intensity is big, can be used under strongly reducing atmosphere, thermal conductivity is less than heavy corundum castable,
Good heat insulating.
Corundum bollow ball castable has the very high advantage of temperature in use, but is poured into a mould compared to other alumina-silica fire resistant heat preservings
Material, corundum bollow ball castable still have density big（1.75 T/m3）, thermal conductivity it is high（0.75W/m.K）The deficiencies of.Therefore,
Research more lightweight and more heat-insulated corundum bollow ball castable become the direction of work.
Invention content
In order to solve the above technical problems, the purpose of the present invention is to propose to a kind of Ultralight corundum castable and its preparation sides
Method.
The present invention is to complete above-mentioned purpose to adopt the following technical scheme that：
A kind of Ultralight corundum castable, the raw material composition and weight percent of the Ultralight corundum castable are：
Corundum bollow ball particle 0.2-5mm 40-80 wt%；
Bonding agent<200 mesh 10-50 wt%；
High temperature sintering agent 5-15 wt%；
Pore creating material 0.02-0.50 wt%；
Water-reducing agent 0.1-1.0 wt%；
The high temperature sintering agent is aluminium oxide Ultramicro-powder, and aluminium oxide Ultramicro-powder is the one or more that d50 is 5um, 2um, 1um
Arbitrary proportion mixture；
The bonding agent is pure calcium aluminate cement, it is desirable that its Al2O3+ CaO content is 99wt% or more, and granularity is<200 mesh；
There is CaOAl in pure calcium aluminate cement2O3And CaO2Al2O3Two kinds of object phases.
The corundum bollow ball particle belongs to a kind of high temperature insulating material, and by commercial alumina, melting is blown in electric furnace
It forms, alumina content 99wt% or more, can be used in 1800 DEG C of temperature for a long time, bulk density is far below electro-corundum particle.
The weight percent of the corundum bollow ball particle is 50-65wt%.
The aluminium oxide Ultramicro-powder is by any two difference d50 aluminium oxide Ultramicro-powders progress that d50 is in 5um, 2um, 1um
Mixing is added, addition 8-12wt%.
The pure calcium aluminate cement can be Al2O3Content is 70 ± 1wt%, Al2O3Content be 75 ± 1wt% or
Al2O3The mixture for one or more of arbitrary proportions that content is 80 ± 1wt%, addition 20-30wt%.
Pure calcium aluminate cement reacts cementing offer bond strength with water at normal temperatures, and the presetting period is 1h or so, when final set
Between for 4h or so, can be demoulded for 24 hours by being conserved after die casting.
The pore creating material is one kind in azodicarbonamide ADC, protein type micro- pore former NG10 and rosin soap FP-3
Or the mixture of several arbitrary proportions, addition 0.15-0.30wt%.
The water-reducing agent is one kind in the phosphate-based water-reducing agents such as sodium tripolyphosphate, calgon, and effect is main
It is to reduce water requirement under the premise of improving the workabilities such as mobility, the coagulability of lightweight corundum castable.
A kind of preparation method of Ultralight corundum castable mixes after weighing above-mentioned raw materials in proportion in blender
Uniformly, in blender, since aluminium oxide Ultramicro-powder is high active substance, two of aluminium oxide Ultramicro-powder and pure calcium aluminate cement
Object phase CaOAl2O3、CaO·2Al2O3It reacts at high temperature and generates CaO2Al2O3And CaO6Al2O3Object phase；Chemistry
Reaction equation is：
CaO•Al2O3+Al2O3=CaO•2Al2O3Formula 1
CaO•2Al2O3+4Al2O3=CaO•6Al2O3Formula 2；
Above-mentioned chemical reaction can make material form high temperature sintering, improve its structural strength, can also generate certain volume expansion,
It makes up this castable other components and volatilizees and burn at high temperature and shunk caused by mistake, improve the volume stability of material；Raw material exists
It is obtained by the reaction under high temperature to contain CaO2Al2O3And CaO6Al2O3The castable product of object phase；Then by castable product
It is uniformly mixed with water, during castable product is mixed with water, pore creating material has good foaming characteristic after being dissolved in water
Aperture with excellent foam stability, bubble is 30-150um, and the aperture of multiple holes is 40-100um, and bubble is in relatively solely
Vertical closed state, the partition between bubble and bubble make its structural behaviour good.It is macro compared to what corundum bollow ball generated
Stomata is seen, pore creating material generates the aperture miniaturization of stomata and homogenization is more advantageous to the heat-proof quality for greatly improving material；Pore-creating
The bubble stabilization time that agent generates up to 10-24h, has been more than initial set and the final setting time of cementitious binder, therefore can stablize
It is present in the structure of castable, significantly reduces the consistency of castable；Pouring material product is molded after being mixed with water using gravity flow
Or vibration moulding mode constructs structure and shape, can come into operation after room temperature natural curing or high-temperature baking；Final
The density of the castable arrived is 1.20-1.60 T/m3, thermal conductivity 0.30-0.55W/mK, compressive resistance 15-30MPa.
A kind of Ultralight corundum castable proposed by the present invention and preparation method thereof selects corundum bollow ball as aggregate,
Both it can ensure the performance under its high temperature section, the global density of castable can also be reduced, and improve the thermal insulation of castable
Energy；
The characteristics of Ultralight corundum castable of the present invention, also resides in：
The material at high temperature performance is stablized, and can use safely in various atmospheres, including oxidizing atmosphere, CO/H2 reducing atmospheres, oxygen
Change/reduction alternating atmosphere, nitrogen atmosphere, argon gas atmosphere etc..
Compared to materials such as corundum castable, corundum bollow ball castables, Ultralight corundum castable of the present invention
Heat-proof quality greatly improve, be conducive to the energy saving of kiln or equipment.
Compared to materials such as corundum castable, corundum bollow ball castables, poured using Ultralight corundum of the present invention
The engineering dosage and engineering cost of material feeding are greatly reduced.
Can with site operation and maintenance, and can be built according to the variation of the demand of operating mode, design, scene build different sizes and
The product of specification.
Performance is excellent：Ultralight corundum castable of the present invention at home the gas pipeline of more gasification furnaces,
The positions such as burner support element use, have high temperature resistant, thermal and insulating performance is excellent, resistance to reduction atmosphere is good, volume stability is high,
Advantage with long service life.
Description of the drawings
Fig. 1 is the microstructure photograph using the wear-resistant material of 1 technical solution of embodiment.
Specific implementation mode
The embodiment of invention now given below, but do not constitute any limitation of the invention.It is previously mentioned in embodiment
Property indices are detected according to YB/T 5202.1, YB/T 4130, YB/T 5200, GB/T 5072 respectively.
Table 1 is the Testing index of Ultralight corundum castable in 1~embodiment of embodiment 5.
Embodiment 1：
Each component is weighed by following quality proportioning：
Corundum bollow ball particle 0.2-5mm 59.55wt%
Bonding agent<200 mesh, 30 wt%
10 wt% of high temperature sintering agent
0.25 wt% of pore creating material
0.2 wt% of water-reducing agent
Wherein, bonding agent selects aluminate cement（Praise resistance to CA-80）, high temperature sintering agent selection aluminium oxide Ultramicro-powder d50=1um
（5wt%）With d50=2um（5wt%）Combination, pore creating material ADC（0.2wt%）And NG10（0.05 wt%）Combination, water-reducing agent
For FS10.
Each component is weighed according to the ratio and is uniformly mixed in forced stirrer, adds after water stirs evenly and can be obtained
Ultralight corundum castable.
Embodiment 2：
Each component is weighed by following quality proportioning：
Corundum bollow ball particle 0.2-5mm 73.5wt%
Bonding agent<200 mesh, 10 wt%
15 wt% of high temperature sintering agent
0.5 wt% of pore creating material
1 wt% of water-reducing agent
Wherein, bonding agent selects aluminate cement（Praise resistance to CA-75）, high temperature sintering agent selection aluminium oxide Ultramicro-powder d50=5um
（10wt%）With d50=2um（5wt%）Combination, pore creating material FP-3（0.4wt%）And NG10（0.1 wt%）Combination, water-reducing agent
For ADS3（0.75wt%）And ADW1（0.25 wt%）Combination.
Each component is weighed according to the ratio and is uniformly mixed in forced stirrer, adds after water stirs evenly and can be obtained
Ultralight corundum castable.
Embodiment 3：
Corundum bollow ball particle 0.2-5mm 44.88wt%
Bonding agent<200 mesh, 50 wt%
5 wt% of high temperature sintering agent
0.02 wt% of pore creating material
0.1 wt% of water-reducing agent
Wherein, bonding agent selects secar71（40wt%）And CA-80（10wt%）Combination, high temperature sintering agent selects aluminium oxide super
Micro mist d50=1um, pore creating material NG10, water-reducing agent are sodium tripolyphosphate（0.05wt%）And calgon（0.05 wt%）'s
Combination.
Each component is weighed according to the ratio and is uniformly mixed in forced stirrer, adds after water stirs evenly and can be obtained
Ultralight corundum castable.
Embodiment 4：
Corundum bollow ball particle 0.2-5mm 40wt%
Bonding agent<200 mesh, 44.65 wt%
15 wt% of high temperature sintering agent
0.2 wt% of pore creating material
0.15 wt% of water-reducing agent
Wherein, bonding agent selects secar71（30wt%）And CA-75（14.65wt%）Combination, high temperature sintering agent select aluminium oxide
Ultramicro-powder d50=5um（10wt%）With d50=1um（5wt%）Combination, pore creating material ADC（0.15wt%）And FP-3（0.05
wt%）Combination, water-reducing agent is calgon.
Each component is weighed according to the ratio and is uniformly mixed in forced stirrer, adds after water stirs evenly and can be obtained
Ultralight corundum castable.
Embodiment 5：
Corundum bollow ball particle 0.2-5mm 80wt%
Bonding agent<200 mesh 12wt%
High temperature sintering agent 7.2wt%
Pore creating material 0.3wt%
Water-reducing agent 0.5wt%
Wherein, bonding agent selects CA-80, high temperature sintering agent to select aluminium oxide Ultramicro-powder d50=1um（4wt%）、d50=2um
（3wt%）With d50=5um（5wt%）Combination, pore creating material ADC（0.1wt%）、NG10（0.05wt%）And FP-3（0.15 wt%）
Combination, water-reducing agent ADS3（0.35wt%）And ADW1（0.15 wt%）Combination.
Each component is weighed according to the ratio and is uniformly mixed in forced stirrer, adds after water stirs evenly and can be obtained
Ultralight corundum castable.
The performance indicator of 1. embodiment 1- embodiments 5 of table
Claims (7)
1. a kind of Ultralight corundum castable, it is characterised in that：The raw material of the Ultralight corundum castable forms and weight hundred
Point ratio is：
Corundum bollow ball particle 0.2-5mm 40-80 wt%；
Bonding agent<200 mesh 10-50 wt%；
High temperature sintering agent 5-15 wt%；
Pore creating material 0.02-0.50 wt%；
Water-reducing agent 0.1-1.0 wt%；
The high temperature sintering agent is aluminium oxide Ultramicro-powder, and aluminium oxide Ultramicro-powder is the one or more that d50 is 5um, 2um, 1um
Arbitrary proportion mixture；
The bonding agent is pure calcium aluminate cement, it is desirable that its Al2O3+CaO content is 99wt% or more, and granularity is<200 mesh；
There is CaOAl in pure calcium aluminate cement2O3And CaO2Al2O3Two kinds of object phases.
2. a kind of Ultralight corundum castable as described in claim 1, it is characterised in that：The corundum bollow ball particle category
In a kind of high temperature insulating material, by commercial alumina, melting is blown in electric furnace, alumina content 99wt% or more, can be grown
Phase uses in 1800 DEG C of temperature, and bulk density is far below electro-corundum particle.
3. a kind of Ultralight corundum castable as described in claim 1, it is characterised in that：The weight of the corundum bollow ball particle
Amount percentage is 50-65wt%.
4. a kind of Ultralight corundum castable as described in claim 1, it is characterised in that：The aluminium oxide Ultramicro-powder by
D50 is that any two difference d50 aluminium oxide Ultramicro-powders in 5um, 2um, 1um carry out mixing addition, addition 8-12wt%.
5. a kind of Ultralight corundum castable as described in claim 1, it is characterised in that：The pure calcium aluminate cement can be with
It is 70 ± 1wt% for Al2O3 contents, the one or more that Al2O3 contents are 75 ± 1wt% or Al2O3 contents are 80 ± 1wt%
Arbitrary proportion mixture, addition 20-30wt%.
6. a kind of Ultralight corundum castable as described in claim 1, it is characterised in that：The pore creating material is azo diformazan
The mixture of the arbitrary proportion of one or more of amide ADC, protein type micro- pore former NG10 and rosin soap FP-3, addition
For 0.15-0.30wt%.
7. a kind of preparation method of Ultralight corundum castable as described in claim 1-6 any claims, by above-mentioned raw materials
It after weighing in proportion, is uniformly mixed in blender, in blender, since aluminium oxide Ultramicro-powder is high active substance, oxidation
Two object phase CaOAl of aluminium Ultramicro-powder and pure calcium aluminate cement2O3、CaO·2Al2O3React generation at high temperature
CaO·2Al2O3And CaO6Al2O3Object phase；Chemical equation is：
CaO•Al2O3+Al2O3=CaO•2Al2O3Formula 1
CaO•2Al2O3+4Al2O3=CaO•6Al2O3Formula 2；
Above-mentioned chemical reaction can make material form high temperature sintering, improve its structural strength, can also generate certain volume expansion,
It makes up this castable other components and volatilizees and burn at high temperature and shunk caused by mistake, improve the volume stability of material；Raw material exists
It is obtained containing CaO2Al under high temperature2O3And CaO6Al2O3The castable product of object phase；Then castable product is mixed with water
Close uniform, during castable product is mixed with water, pore creating material is after being dissolved in water, with good foaming characteristic and excellent
Foam stability, the aperture of bubble is 30-150um, and the aperture of multiple holes is 40-100um, and bubble is in relatively independent envelope
Closed state, the partition between bubble and bubble make its structural behaviour good.Compared to corundum bollow ball generate macroscopical stomata,
Pore creating material generates the aperture miniaturization of stomata and homogenization is more advantageous to the heat-proof quality for greatly improving material；What pore creating material generated
Bubble stabilization time up to 10-24h, has been more than initial set and the final setting time of cementitious binder, therefore can be stable in the presence of and pour
In the structure of material feeding, the consistency of castable is significantly reduced；Pouring material product mixed with water after using gravity flow molding or vibrate at
Type mode constructs structure and shape, can come into operation after room temperature natural curing or high-temperature baking；Finally obtained cast
The density of material is 1.20-1.60 T/m3, thermal conductivity 0.30-0.55W/mK, compressive resistance 15-30MPa.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113666720A (en) * | 2021-07-26 | 2021-11-19 | 中国铝业股份有限公司 | Furnace cover of continuous ultra-high temperature furnace and castable thereof |
| CN114262237A (en) * | 2022-02-28 | 2022-04-01 | 北京市一滴水环保科技有限公司 | Light microporous ceramic filter material and preparation method thereof, and ceramic particles for water treatment and filtration and preparation method thereof |
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| JPS56120577A (en) * | 1980-02-21 | 1981-09-21 | Nippon Steel Corp | Blast furnace tap hole material |
| CN102976771A (en) * | 2012-11-16 | 2013-03-20 | 宜兴天霸非金属材料有限公司 | High temperature resistant lightweight heat insulation castables |
| CN104193394A (en) * | 2014-08-29 | 2014-12-10 | 中钢集团洛阳耐火材料研究院有限公司 | Method for preparing lightweight alumina hollow sphere heat insulation product |
| CN105503216A (en) * | 2015-12-24 | 2016-04-20 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method of light and high-strength alumina bubble product |
-
2018
- 2018-07-02 CN CN201810704855.0A patent/CN108675809A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56120577A (en) * | 1980-02-21 | 1981-09-21 | Nippon Steel Corp | Blast furnace tap hole material |
| CN102976771A (en) * | 2012-11-16 | 2013-03-20 | 宜兴天霸非金属材料有限公司 | High temperature resistant lightweight heat insulation castables |
| CN104193394A (en) * | 2014-08-29 | 2014-12-10 | 中钢集团洛阳耐火材料研究院有限公司 | Method for preparing lightweight alumina hollow sphere heat insulation product |
| CN105503216A (en) * | 2015-12-24 | 2016-04-20 | 中钢集团洛阳耐火材料研究院有限公司 | Preparation method of light and high-strength alumina bubble product |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113666720A (en) * | 2021-07-26 | 2021-11-19 | 中国铝业股份有限公司 | Furnace cover of continuous ultra-high temperature furnace and castable thereof |
| CN113666720B (en) * | 2021-07-26 | 2023-11-28 | 中国铝业股份有限公司 | Continuous ultra-high temperature furnace cover and castable thereof |
| CN114262237A (en) * | 2022-02-28 | 2022-04-01 | 北京市一滴水环保科技有限公司 | Light microporous ceramic filter material and preparation method thereof, and ceramic particles for water treatment and filtration and preparation method thereof |
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