CN102976778B - Coal ash-based mullite light heat-insulation brick and preparation method thereof - Google Patents
Coal ash-based mullite light heat-insulation brick and preparation method thereof Download PDFInfo
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- CN102976778B CN102976778B CN201210524919.1A CN201210524919A CN102976778B CN 102976778 B CN102976778 B CN 102976778B CN 201210524919 A CN201210524919 A CN 201210524919A CN 102976778 B CN102976778 B CN 102976778B
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Abstract
The invention relates to a coal ash-based mullite light heat-insulation brick and a preparation method thereof. According to the adopted technical scheme, the preparation method comprises the steps of: firstly, preparing 50-90wt% of coal ash and 10-50wt% of alumina serving as raw materials, adding 0.5-5.0wt% of swelling agent, 25-60wt% of water and 0.1-1.0wt% of water reducer relative to the raw materials, mixing 3-15min to obtain pug; then adding foam made by 0.5-2.0wt% of foaming agent relative to the raw materials, uniformly stirring, adding 1-5wt% of gel, 0.1-1.0wt% of thermosetting resin and 1-3wt% of curing agent relative to the raw materials, stirring 3-15min, moulding by casting, naturally drying for 3-10h, demoulding, baking for 12-24h at a temperature of 60-120 DEG C; and finally, preserving the heat for 3-12h at a temperature of 1150-1550 DEG C to obtain the coal ash-based mullite light heat-insulation brick. The preparation method has the characteristics of resource saving, environment friendliness, short demoulding time, short drying period and suitability for large-scale industrial production; and the coal ash-based mullite light heat-insulation brick has the advantages of high strength, low volume density and low heat conductivity coefficient.
Description
Technical field
The invention belongs to light heat-insulation brick technical field, be specifically related to a kind of fly ash base mullite light heat-insulation brick and preparation method thereof.
Background technology
Flyash is the main solid waste that a kind of coal-burning power plant discharges, one of industrial residue that the current discharge capacity of Ye Shi China is larger.Along with the development of power industry, the flyash quantity discharged of coal-burning power plant increases year by year, and a large amount of flyash does not add processing, will produce airborne dust, atmosphere pollution, can cause river to silt up if enter water system, and toxic chemical substance in flyash also can work the mischief to human body and biology.At present, the effective rate of utilization of flyash is lower, only has a small amount of utilization in Cement industry and refractory industry.Therefore, how to effectively utilize these solid waste and become the key problem in technology of resource rational utilization.
Along with high strength, low heat conduction light lagging material are in the widespread use of Iron And Steel Industry, will improve the heat insulation effect of the melted steel container such as ladle, tundish, reduce the temperature drop rate of molten steel, improve the quality of strand, can also reduce the melting loss of refractory materials simultaneously and reduce ton steel refractory consumption rate.The Al of light mullite brick
2o
3content is 50 ~ 80wt%, with mullite (3 Al
2o
32 SiO
2) be principal crystalline phase and the novel high-quality insulative refractory materials in conjunction with phase, there is good high-temperature mechanical property and chemical stability.Produce at present lightweight mullite heat insulating brick and be mostly take bauxitic clay and kyanite, sillimanite as main raw material, but these resource relative shortages of China, and too high with the light mullite brick cost of above-mentioned raw material production.
The preparation of light heat-insulating material mainly contains following several method: (1) burnout substances addition method, in slip, add the technique of combustiblematerials or volatile substances formation pore, this method gas cell distribution is difficult to evenly, the insufficient phenomenon that easily causes evil mind of combustiblematerials burning also can cause larger pollution to environment simultaneously; (2) porous material method, adopts the porous materials such as natural diatomite or synthetic alumina hollow ball to prepare light fire brick as raw material, product strength that the method makes is high, aperture all even being easy to control, but belong to secondary processes, cost is high; (3) foaming process, this method is first prepared whipping agent and stablizer in certain proportion, then be added in a certain amount of water, be made into foaming agent, the foam again foaming agent being obtained by churned mechanically mode, join in previously prepared good mud and mix, dry and burn till and obtain goods through casting, maintenance.This method can be prepared complex-shaped foamed ceramics goods, and the goods that obtain mostly are the hole of holding one's breath, and even aperture distribution, also can be used for preparing the light material that unit weight is less.But the method need to add a large amount of bonding agents, and exist drying cycle longer, the shortcoming such as shrink of product is large, is seriously restricting the performance of light material.
The patented technology of " a kind of method of coal ash for manufacturing for light spume multi-hole bricks of utilizing " (CN 101550021A) discloses a kind of method of preparing light heat-insulating material take flyash as main raw material, there is following shortcoming in this patented technology: (1) slurry digestion time is long, is unfavorable for industrial production; (2) flyash complicated component, itself contains a large amount of impurity and can be used as solubility promoter, and the method is not only avoided its negative impact, again adds on the contrary solubility promoter, and after burning till at 1050 ± 50 ℃, product shrinks serious, cannot normally use.
The patented technology of " ultra-light cement-based composite foaming material and preparation method thereof " (CN 102285778 A) discloses a kind of take cement and flyash as main raw material, utilize foaming to prepare the method for light heat insulation material, the method main drawback is embodied in: (1) is used cement combination in a large number, has improved cost; (2) owing to containing a large amount of CaO in cement, at high temperature easy and SiO
2form eutectic phase, limited its use range, cannot be applied to high-temperature field; (3) sample curing time is long, and process complexity, is unfavorable for industrial production.
Summary of the invention
The present invention is intended to overcome prior art defect, object is to provide and a kind ofly economizes on resources, environmental friendliness, without bonding agent, demould time is fast, drying cycle is short and the preparation method of the fly ash base mullite light heat-insulation brick of applicable large-scale industrial production; The mullite light heat-insulation brick of preparing by the method has higher intensity, lower volume density and lower thermal conductivity.
For achieving the above object, the technical solution adopted in the present invention is: first take the flyash of 50 ~ 90wt% and the alumina of 10 ~ 50wt% as raw material, the water reducer of the swelling agent of additional described raw material 0.5 ~ 5.0wt%, the water of 25 ~ 60wt% and 0.1 ~ 1.0wt%, mixes 3 ~ 15min, makes pug; Then the made foam of the whipping agent of additional described raw material 0.5 ~ 2.0wt%, stirs, the gelifying agent of more additional described raw material 1 ~ 5wt%, the thermosetting resin of 0.1 ~ 1.0wt% and the solidifying agent of 1 ~ 3wt%, stirs 3 ~ 5min, casting.Seasoning 3 ~ 10h at ambient temperature, the demoulding is toasted 12 ~ 24h under 60 ~ 120 ℃ of conditions, finally under 1150 ~ 1550 ℃ of conditions, is incubated 3 ~ 12h, obtains fly ash base mullite light heat-insulation brick.
The Main chemical component of described flyash is: Al
2o
3be 25 ~ 40wt%, SiO
2be 30 ~ 54wt%, Fe
2o
3be 0.1 ~ 3.0wt%, TiO
2be that 1.0 ~ 2.0wt%, CaO are that 3.0 ~ 8.0wt% and burning mistake are 3 ~ 5wt%; Its particle diameter≤0.088mm.
The Main chemical component of described alumina is: Al
2o
3be 60 ~ 72wt%, SiO
2be 8 ~ 20wt%, Fe
2o
3be 0.5 ~ 1.5wt%, TiO
2be 2.0 ~ 3.0wt%, K
2o+NaO is that 0.4 ~ 1.2 wt%, CaO+MgO are that 0.2 ~ 0.6wt% and burning mistake are 13.5 ~ 14.5wt%; Its particle diameter≤0.088mm.
Described swelling agent is the one in kyanite, andaluzite and sillimanite, its particle diameter≤0.088mm.
Described water reducer is more than one in tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and sodium lignosulfonate.
Described gelifying agent is the one in silicon dioxide gel, TiO 2 sol, alumina sol and aluminium silicon sol.
Described thermosetting resin is the one in terpolycyantoamino-formaldehyde resin, furfural phenol resin, furfural acetone resin, furfuryl alcohol resin, polybutadiene, silicone resin and water-soluble epoxy resin.
Described solidifying agent is the one in methylcarbonate, diethyl carbonate, methyl esters, ethyl ester, butyl ester, glycol ester and glyceryl ester.
Owing to adopting technique scheme, of the present invention was mainly material flyash originally, and this flyash is a kind of solid waste, and output is large, and utilization ratio is low, and in order to the higher light heat-insulation brick of production added value, production cost is low, and environmental friendliness, economizes on resources; The present invention is low by preparation viscosity, the slip of high solid volume fraction, then in slip, adds gelifying agent, thermosetting resin and solidifying agent, and slurry original position is solidified, and without bonding agent, and demould time is short, and technique is simple, is applicable to large-scale industrial production.
The present invention adopts Foaming method, makes fly ash base mullite light heat-insulation brick volume density controllability strong, and environmental pollution is little.Adopting the volume density of the prepared fly ash base mullite light heat-insulation brick of the method is 0.5 ~ 1.3g/cm
3, thermal conductivity is 0.18 ~ 0.55W/ (mK), compressive strength is 1.7 ~ 20.0MPa, can meet well Industrial Stoves requirement.
Therefore, the present invention have advantages of economize on resources, environmental friendliness, demould time is fast, drying cycle is short and applicable large-scale industrial production, prepared fly ash base mullite light heat-insulation brick intensity is higher, volume density and thermal conductivity are lower.
Embodiment
Below in conjunction with embodiment, the present invention will be further described, not limiting the scope of the invention.
For avoiding repetition, first relevant technologies improve parameter unification involved this embodiment is described below:
The Main chemical component of flyash is: Al
2o
3be 25 ~ 40wt%, SiO
2be 30 ~ 54wt%, Fe
2o
3be 0.1 ~ 3.0wt%, TiO
2be that 1.0 ~ 2.0wt%, CaO are that 3.0 ~ 8.0wt% and burning mistake are 3 ~ 5wt%; Its particle diameter≤0.088mm.
The Main chemical component of alumina is: Al
2o
3be 60 ~ 72wt%, SiO
2be 8 ~ 20wt%, Fe
2o
3be 0.5 ~ 1.5wt%, TiO
2be 2.0 ~ 3.0wt%, K
2o+NaO is that 0.4 ~ 1.2 wt%, CaO+MgO are that 0.2 ~ 0.6wt% and burning mistake are 13.5 ~ 14.5wt%; Its particle diameter≤0.088mm.
Swelling agent be kyanite, andaluzite and sillimanite particle diameter all≤0.088mm.
embodiment 1
A kind of fly ash base mullite light heat-insulation brick and preparation method thereof.First take the flyash of 50 ~ 55wt% and the alumina of 45 ~ 50wt% as raw material, the tripoly phosphate sodium STPP of the sillimanite of additional described raw material 0.5 ~ 1.0wt%, the water of 25 ~ 30wt%, 0.30 ~ 0.40wt%, the Sodium hexametaphosphate 99 of 0.25 ~ 0.35wt% and 0.1 ~ 0.2 sodium lignosulfonate, mix 3 ~ 15min, make pug; Then the made foam of the whipping agent of additional described raw material 0.5 ~ 0.9wt%, stir, the terpolycyantoamino-formaldehyde resin of the alumina sol of additional described raw material 1.0 ~ 1.8wt%, 0.10 ~ 0.28wt% and the methylcarbonate of 1.0 ~ 1.4wt% again, stirs 3 ~ 5min, casting.Seasoning 3 ~ 6h at ambient temperature, the demoulding is toasted 12 ~ 18h under 60 ~ 120 ℃ of conditions, finally under 1500 ~ 1550 ℃ of conditions, is incubated 10 ~ 12h, obtains fly ash base mullite light heat-insulation brick.
The volume density of the prepared fly ash base mullite of the present embodiment 1 light heat-insulation brick is 1.2 ~ 1.3g/cm
3, thermal conductivity is 0.45 ~ 0.55W/ (mK), compressive strength reaches 12.4 ~ 20MPa.
embodiment 2
A kind of fly ash base mullite light heat-insulation brick and preparation method thereof.First take the flyash of 55 ~ 60wt% and the alumina of 40 ~ 45wt% as raw material, the tripoly phosphate sodium STPP of the sillimanite of additional described raw material 0.7 ~ 1.3wt%, the water of 30 ~ 37wt%, 0.30 ~ 0.40wt% and 0.20 ~ 0.30wt% Sodium hexametaphosphate 99, mix 3 ~ 15min, make pug; Then the made foam of the whipping agent of additional described raw material 0.9 ~ 1.2wt%, stir, the furfural phenol resin of the alumina sol of additional described raw material 1.8 ~ 2.6wt%, 0.28 ~ 0.46wt% and the diethyl carbonate of 1.4 ~ 1.8wt% again, stirs 3 ~ 5min, casting.Seasoning 3 ~ 6h at ambient temperature, the demoulding is toasted 12 ~ 18h under 60 ~ 120 ℃ of conditions, finally under 1500 ~ 1550 ℃ of conditions, is incubated 8 ~ 10h, obtains fly ash base mullite light heat-insulation brick.
The volume density of the prepared fly ash base mullite of the present embodiment 2 light heat-insulation brick is 0.9 ~ 1.1g/cm
3, thermal conductivity is 0.38 ~ 0.45W/ (mK), compressive strength reaches 9 ~ 14MPa.
embodiment 3
A kind of fly ash base mullite light heat-insulation brick and preparation method thereof.First, take the flyash of 60 ~ 65wt% and the alumina of 35 ~ 40wt% as raw material, the sodium lignosulfonate of the sillimanite of additional described raw material 1.3 ~ 2.0wt%, the water of 36 ~ 43wt%, 0.80 ~ 1.00wt%, mixes 3 ~ 15min, makes pug; Then the made foam of the whipping agent of additional described raw material 1.2 ~ 1.6wt%, stir, the furfural acetone resin of the alumina sol of additional described raw material 2.6 ~ 3.2wt%, 0.46 ~ 0.64wt% and the methyl esters of 1.8 ~ 2.2wt% again, stirs 3 ~ 5min, casting.Seasoning 6 ~ 8h at ambient temperature, the demoulding is toasted 15 ~ 22h under 60 ~ 120 ℃ of conditions, finally under 1500 ~ 1550 ℃ of conditions, is incubated 6 ~ 8h, obtains fly ash base mullite light heat-insulation brick.
The volume density of the prepared fly ash base mullite of the present embodiment 3 light heat-insulation brick is 0.7 ~ 0.9g/cm
3, thermal conductivity is 0.30 ~ 0.38W/ (mK), compressive strength reaches 4.8 ~ 10MPa.
embodiment 4
A kind of fly ash base mullite light heat-insulation brick and preparation method thereof.First, take the flyash of 65 ~ 70wt% and the alumina of 30 ~ 35wt% as raw material, the Sodium hexametaphosphate 99 of the andaluzite of additional described raw material 2.0 ~ 2.5wt%, the water of 43 ~ 50wt%, 0.50 ~ 0.70wt%, mixes 3 ~ 15min, makes pug; Then the made foam of the whipping agent of additional described raw material 1.5 ~ 1.8wt%, stir, the polybutadiene of the titanium oxide sol of additional described raw material 3.2 ~ 4.1wt%, 0.64 ~ 0.82wt% and the ethyl ester of 2.2 ~ 2.6wt% again, stirs 3 ~ 5min, casting.Seasoning 8 ~ 10h at ambient temperature, the demoulding is toasted 20 ~ 24h under 60 ~ 120 ℃ of conditions, finally under 1400 ~ 1500 ℃ of conditions, is incubated 4 ~ 6h, obtains fly ash base mullite light heat-insulation brick.
The volume density of the prepared fly ash base mullite of the present embodiment 4 light heat-insulation brick is 0.6 ~ 0.8g/cm
3, thermal conductivity is 0.22 ~ 0.30W/ (mK), compressive strength reaches 3.6 ~ 6MPa.
embodiment 5
A kind of fly ash base mullite light heat-insulation brick and preparation method thereof.First, take the flyash of 70 ~ 75wt% and the alumina of 25 ~ 30wt% as raw material, the tripoly phosphate sodium STPP of the andaluzite of additional described raw material 2.5 ~ 3.2wt%, the water of 50 ~ 55wt%, 0.30 ~ 0.50wt%, mixes 3 ~ 15min, makes pug; Then the made foam of the whipping agent of additional described raw material 1.8 ~ 2.0wt%, stirs, the titanium oxide sol of more additional described raw material 4.1 ~ 5.0wt%, the silicone resin of 0.82 ~ 1.0wt% and the butyl ester of 2.6 ~ 3wt%, stirs 3 ~ 5min, casting.Seasoning 10 ~ 12h at ambient temperature, the demoulding is toasted 20 ~ 24h under 60 ~ 120 ℃ of conditions, finally under 1400 ~ 1500 ℃ of conditions, is incubated 4 ~ 6h, obtains fly ash base mullite light heat-insulation brick.
The volume density of the prepared fly ash base mullite of the present embodiment 5 light heat-insulation brick is 0.5 ~ 0.7g/cm
3, thermal conductivity is 0.18 ~ 0.22W/ (mK), compressive strength reaches 1.7 ~ 4.2MPa.
embodiment 6
A kind of fly ash base mullite light heat-insulation brick and preparation method thereof.First take the flyash of 75 ~ 80wt% and the alumina of 20 ~ 25wt% as raw material, the tripoly phosphate sodium STPP of the andaluzite of additional described raw material 3.0 ~ 3.7wt%, the water of 30 ~ 35wt%, 0.30 ~ 0.40wt% and 0.20 ~ 0.30wt% Sodium hexametaphosphate 99, mix 3 ~ 15min, make pug; Then the made foam of the whipping agent of additional described raw material 1.8 ~ 2.0wt%, stirs, the silica sol of more additional described raw material 4.1 ~ 5.0wt%, the furfuryl alcohol resin of 0.82 ~ 1.0wt% and the glycol ester of 2.6 ~ 3.0wt%, stirs 3 ~ 5min, casting.Seasoning 6 ~ 8h at ambient temperature, the demoulding is toasted 22 ~ 24h under 60 ~ 120 ℃ of conditions, finally under 1400 ~ 1500 ℃ of conditions, is incubated 3 ~ 5h, obtains fly ash base mullite light heat-insulation brick.
The volume density of the prepared fly ash base mullite of the present embodiment 6 light heat-insulation brick is 0.5 ~ 0.7g/cm
3, thermal conductivity is 0.18 ~ 0.22W/ (mK), compressive strength reaches 1.7 ~ 4.2MPa.
embodiment 7
A kind of fly ash base mullite light heat-insulation brick and preparation method thereof.First, take the flyash of 80 ~ 85wt% and the alumina of 15 ~ 20wt% as raw material, the tripoly phosphate sodium STPP of the kyanite of additional described raw material 3.7 ~ 4.5wt%, the water of 55 ~ 60wt%, 0.10 ~ 0.30wt%, mixes 3 ~ 15min, makes pug; Then the made foam of the whipping agent of additional described raw material 0.5 ~ 0.9wt%, stir, the water-soluble epoxy resin of the silicon-aluminum sol of additional described raw material 1.0 ~ 1.8wt%, 0.10 ~ 0.28wt% and the glyceryl ester of 1.0 ~ 1.4wt% again, stirs 3 ~ 5min, casting.Seasoning 10 ~ 12h at ambient temperature, the demoulding is toasted 12 ~ 18h under 60 ~ 120 ℃ of conditions, finally under 1300 ~ 1400 ℃ of conditions, is incubated 3 ~ 5h, obtains fly ash base mullite light heat-insulation brick.
The volume density of the prepared fly ash base mullite of the present embodiment 7 light heat-insulation brick is 1.2 ~ 1.3g/cm
3, thermal conductivity is 0.45 ~ 0.55W/ (mK), compressive strength reaches 12.4 ~ 20MPa.
embodiment 8
A kind of fly ash base mullite light heat-insulation brick and preparation method thereof.First take the flyash of 85 ~ 90wt% and the alumina of 10 ~ 15wt% as raw material, the sodium lignosulfonate of the kyanite of additional described raw material 4.5 ~ 5.0wt%, the water of 25 ~ 30wt%, 0.40 ~ 0.50wt% and 0.25 ~ 0.35wt% Sodium hexametaphosphate 99, mix 3 ~ 15min, make pug; Then the made foam of the whipping agent of additional described raw material 1.8 ~ 2.0wt%, stir, the terpolycyantoamino-formaldehyde resin of the silicon-aluminum sol of additional described raw material 4.1 ~ 5.0wt%, 0.82 ~ 1.0wt% and the methylcarbonate of 2.6 ~ 3.0wt% again, stirs 3 ~ 5min, casting.Seasoning 4 ~ 6h at ambient temperature, the demoulding is toasted 20 ~ 24h under 60 ~ 120 ℃ of conditions, finally under 1300 ~ 1400 ℃ of conditions, is incubated 3 ~ 5h, obtains fly ash base mullite light heat-insulation brick.
The volume density of the prepared fly ash base mullite of the present embodiment 8 light heat-insulation brick is 0.5 ~ 0.7g/cm
3, thermal conductivity is 0.17 ~ 0.21W/ (mK), compressive strength reaches 1.8 ~ 4.1MPa.
embodiment 9
A kind of fly ash base mullite light heat-insulation brick and preparation method thereof.First take the flyash of 60 ~ 70wt% and the alumina of 30 ~ 40wt% as raw material, the tripoly phosphate sodium STPP of the kyanite of additional described raw material 1.3-2.0wt%, the water of 30 ~ 35wt%, 0.30 ~ 0.40wt% and 0.20 ~ 0.30wt% sodium lignosulfonate, mix 3 ~ 15min, make pug; Then the made foam of the whipping agent of additional described raw material 1.8 ~ 2.0wt%, stir, the water-soluble epoxy resin of the silica sol of additional described raw material 4.1 ~ 5.0wt%, 0.82 ~ 1wt% and the glycol ester of 2.6 ~ 3.0wt% again, stirs 3 ~ 5min, casting.Seasoning 6 ~ 8h at ambient temperature, the demoulding is toasted 18 ~ 22h under 60 ~ 120 ℃ of conditions, finally under 1250 ~ 1350 ℃ of conditions, is incubated 3 ~ 5h, obtains fly ash base mullite light heat-insulation brick.
The volume density of the prepared fly ash base mullite of the present embodiment 9 light heat-insulation brick is 0.5 ~ 0.8g/cm
3, thermal conductivity is 0.18 ~ 0.23W/ (mK), compressive strength reaches 1.7 ~ 4.4MPa.
embodiment 10
A kind of fly ash base mullite light heat-insulation brick and preparation method thereof.First, take the flyash of 50 ~ 60wt% and the alumina of 40 ~ 50wt% as raw material, the kyanite of additional described raw material 3.0 ~ 3.7wt%, the water of 30 ~ 40wt% and 0.70 ~ 0.90wt% sodium lignosulfonate, mix 3 ~ 15min, makes pug; Then the made foam of the whipping agent of additional described raw material 1.8 ~ 2.0wt%, stir, the terpolycyantoamino-formaldehyde resin of the alumina sol of additional described raw material 4.1 ~ 5.0wt%, 0.82 ~ 1.00wt% and the diethyl carbonate of 2.6 ~ 3.0wt% again, stirs 3 ~ 5min, casting.Seasoning 4 ~ 6h at ambient temperature, the demoulding is toasted 18 ~ 24h under 60 ~ 120 ℃ of conditions, finally under 1150 ~ 1250 ℃ of conditions, is incubated 4 ~ 6h, obtains fly ash base mullite light heat-insulation brick.
The volume density of the prepared fly ash base mullite of the present embodiment 10 light heat-insulation brick is 0.5 ~ 0.7g/cm
3, thermal conductivity is 0.18 ~ 0.22W/ (mK), compressive strength reaches 1.7 ~ 4.2MPa.
What this embodiment adopted was mainly material flyash originally, and this flyash is a kind of solid waste, and output is large, and utilization ratio is low, and in order to the higher light heat-insulation brick of production added value, production cost is low, and environmental friendliness, economizes on resources; This embodiment is low by preparation viscosity, the slip of high solid volume fraction, then in slip, adds gelifying agent, thermosetting resin and solidifying agent, and slurry original position is solidified, without bonding agent, and demould time is short, technique is simple, is applicable to large-scale industrial production.
This embodiment adopts Foaming method, makes fly ash base mullite light heat-insulation brick volume density controllability strong, and environmental pollution is little.Adopting the volume density of the prepared fly ash base mullite light heat-insulation brick of the method is 0.5 ~ 1.3g/cm
3, thermal conductivity is 0.18 ~ 0.55W/ (mK), compressive strength is 1.7 ~ 20.0MPa, can meet well Industrial Stoves requirement.
Therefore, this embodiment have advantages of economize on resources, environmental friendliness, demould time is fast, drying cycle is short and applicable large-scale industrial production, prepared fly ash base mullite light heat-insulation brick intensity is higher, volume density and thermal conductivity are lower.
Claims (9)
1. the preparation method of a fly ash base mullite light heat-insulation brick, it is characterized in that first take the flyash of 50 ~ 90wt% and the alumina of 10 ~ 50wt% as raw material, the water reducer of the swelling agent of additional described raw material 0.5 ~ 5.0wt%, the water of 25 ~ 60wt% and 0.1 ~ 1.0wt%, mix 3 ~ 15min, make pug; Then the made foam of the whipping agent of additional described raw material 0.5 ~ 2.0wt%, stirs, the gelifying agent of more additional described raw material 1 ~ 5wt%, the thermosetting resin of 0.1 ~ 1.0wt% and the solidifying agent of 1 ~ 3wt%, stirs 3 ~ 5min, casting; Seasoning 3 ~ 10h at ambient temperature, the demoulding is toasted 12 ~ 24h under 60 ~ 120 ℃ of conditions, finally under 1150 ~ 1550 ℃ of conditions, is incubated 3 ~ 12h, obtains fly ash base mullite light heat-insulation brick.
2. the preparation method of fly ash base mullite light heat-insulation brick according to claim 1, is characterized in that the Main chemical component of described flyash is: Al
2o
3be 25 ~ 40wt%, SiO
2be 30 ~ 54wt%, Fe
2o
3be 0.1 ~ 3.0wt%, TiO
2be that 1.0 ~ 2.0wt%, CaO are that 3.0 ~ 8.0wt% and burning mistake are 3 ~ 5wt%; Its particle diameter≤0.088mm.
3. the preparation method of fly ash base mullite light heat-insulation brick according to claim 1, is characterized in that the Main chemical component of described alumina is: Al
2o
3be 60 ~ 72wt%, SiO
2be 8 ~ 20wt%, Fe
2o
3be 0.5 ~ 1.5wt%, TiO
2be 2.0 ~ 3.0wt%, K
2o+NaO is that 0.4 ~ 1.2 wt%, CaO+MgO are that 0.2 ~ 0.6wt% and burning mistake are 13.5 ~ 14.5wt%; Its particle diameter≤0.088mm.
4. the preparation method of fly ash base mullite light heat-insulation brick according to claim 1, is characterized in that described swelling agent is the one in kyanite, andaluzite and sillimanite, its particle diameter≤0.088mm.
5. the preparation method of fly ash base mullite light heat-insulation brick according to claim 1, is characterized in that described water reducer is more than one in tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and sodium lignosulfonate.
6. the preparation method of fly ash base mullite light heat-insulation brick according to claim 1, is characterized in that described gelifying agent is the one in silicon dioxide gel, TiO 2 sol, alumina sol and aluminium silicon sol.
7. the preparation method of fly ash base mullite light heat-insulation brick according to claim 1, is characterized in that described thermosetting resin is the one in terpolycyantoamino-formaldehyde resin, furfural phenol resin, furfural acetone resin, furfuryl alcohol resin, polybutadiene, silicone resin and water-soluble epoxy resin.
8. the preparation method of fly ash base mullite light heat-insulation brick according to claim 1, is characterized in that described solidifying agent is the one in methylcarbonate, diethyl carbonate, methyl esters, ethyl ester, butyl ester, glycol ester and glyceryl ester.
9. a fly ash base mullite light heat-insulation brick, is characterized in that described mullite light heat-insulation brick is according to the prepared fly ash base mullite light heat-insulation brick of preparation method of the fly ash base mullite light heat-insulation brick described in any one in claim 1 ~ 8.
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