CN103803943A - Foaming ceramic insulation board and preparation method thereof - Google Patents
Foaming ceramic insulation board and preparation method thereof Download PDFInfo
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- CN103803943A CN103803943A CN201310687782.6A CN201310687782A CN103803943A CN 103803943 A CN103803943 A CN 103803943A CN 201310687782 A CN201310687782 A CN 201310687782A CN 103803943 A CN103803943 A CN 103803943A
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Abstract
The invention discloses a foaming ceramic insulation board and a preparation method thereof. The foaming ceramic insulation board is prepared from the following raw materials in percentage by weight: 30%-60% of pulverized fuel ash extracted aluminum oxide residue, 5%-15% of talc, 5%-15% of coal gangue, 30%-50% of fluxing agent and a proper amount of auxiliary material. The pulverized fuel ash extracted aluminum oxide residue and the coal gangue are used as main raw materials for preparing the foaming ceramic insulation board, so that a new approach is provided for the disposal and utilization of the pulverized fuel ash extracted aluminum oxide residue and the coal gangue, and the economic benefits and environmental benefits are increased; moreover, the foaming ceramic insulation board disclosed by the invention is lightweight and has high tensile strength.
Description
Technical field
The present invention relates to ceramic thermal insulation plate field, in particular to a kind of exterior insulation and preparation method thereof.
Background technology
Flyash is the main solid waste that coal-burning power plant discharges.Shi Ge big coal country of China, take coal as the basic fuel of electrical production, with electric power industry development, coal-burning power plant's flyash quantity discharged increases year by year, and within 2000, flyash quantity discharged is about 1.5 hundred million tons, within 2010, reaches 300,000,000 tons.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 wherein toxic chemical substance also can work the mischief to human body and biology, the discharge of a large amount of flyash causes huge pressure to Chinese national economy construction and ecotope.On the other hand, China is again the limited country of per capita resource reserve, the comprehensive utilization of flyash, turn waste into wealth, turn bane into boon, being an important technology economic policy in China's economic construction, is to solve China's electrical production environmental pollution, the important means of contradiction between resource shortage.
For flyash is turned waste into wealth, recycle, disclose a kind of take flyash as main raw material at Chinese invention patent " preparation method of the hole exterior insulation of holding one's breath " (open (bulletin) number: CN102603357A), auxiliary with Ninghai soil micro mist, talcum powder, and take glass powder as solubility promoter under 1230～1260 ℃ of oxidizing atmospheres sintering and be incubated 0.5～2h after furnace cooling obtain exterior insulation, gained exterior insulation is held one's breath porosity more than 75%, and tensile strength reaches 0.2MPa.Although the prepared exterior insulation tensile strength values of this method can obtain 0.2MPa left and right, its mechanical property still needs to improve to meet use needs.
Summary of the invention
The present invention aims to provide a kind of exterior insulation and preparation method thereof, to improve the tensile strength of described exterior insulation.
To achieve these goals, according to an aspect of the present invention, a kind of exterior insulation is provided, and the raw material of this exterior insulation by weight percentage composition meter comprises: flyash extracts aluminum oxide residue 30%～60%, talcum 5%～15%, coal gangue 5%～15%, fusing assistant molten 30%～50% and appropriate auxiliary material.
Further, the raw material of above-mentioned exterior insulation by weight percentage composition meter comprise: flyash extracts aluminum oxide residue 30%～50%, coal gangue 5%～10%, talcum 5%～10%, fusing assistant molten 35%～50% and appropriate auxiliary material.
Further, above-mentioned flyash extracts SiO in aluminum oxide residue
2content be gross weight 30%～50%, Al
2o
3content be gross weight 5.0%～30%, loss on ignition is gross weight 25%～35%.
Further, above-mentioned coal gangue by weight percentage composition meter comprise: SiO
240.2%～55.0%, Al
2o
330.0%～40.0%, K2O0.1%～0.5%, Na2O0.05%～0.3%, CaO0.5%～1.0%, MgO0.05%～0.5%, TiO
20.1%～1.0%, Fe
2o
30.3%～1.5%, loss on ignition 8.0%～15.0%.
Further, above-mentioned auxiliary material comprises by the gross weight of above-mentioned exterior insulation: stablizer 0.1%～5%, whipping agent 0.1%～5%, reductive agent 0.01%～5%.
According to another aspect of the present invention, a kind of preparation method who requires the exterior insulation of any one in 1 to 5 is provided, and the method comprises the following steps: (1) is mixed rear wet ball grinding by residue of aluminum-extracted pulverized fuel ash, coal gangue, talcum, fusing assistant and auxiliary material and made slurry; (2) dry above-mentioned slurry forms presoma powder; (3) the above-mentioned presoma powder of sintering, the above-mentioned exterior insulation of cooling rear formation.
Further, in above-mentioned steps (2), adopt the dry above-mentioned slurry of drying process with atomizing to form presoma powder, or adopt the dry above-mentioned slurry of bake drying-grinding dispersion technique to form presoma powder.
Further, in above-mentioned steps (3), above-mentioned presoma powder is packed in refractory-material dies, strike off rear sintering processes; The material of preferred above-mentioned refractory-material dies is corundum, cordierite or mullite.
Further, in above-mentioned steps (3), before packing above-mentioned presoma powder into refractory-material dies, form refractory paint or refractory masses on the inwall of above-mentioned refractory-material dies, the thickness of preferred above-mentioned refractory paint or refractory masses is 1～2mm.
Further, in above-mentioned steps (3), the temperature of above-mentioned sintering is 1150 ℃～1200 ℃, and above-mentioned sintering time is 30～120min.
Apply a kind of exterior insulation of technical scheme of the present invention and preparation method thereof.By making exterior insulation using flyash extraction aluminum oxide residue and coal gangue as main raw material, for disposal and the utilization of residue of aluminum-extracted pulverized fuel ash and coal gangue provide a kind of new approach, economic benefit and environmental benefit are increased.Meanwhile, make exterior insulation of the present invention there is lighter performance and stronger tensile strength.
Accompanying drawing explanation
The Figure of description that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows according to the embodiment of the present invention 1 exterior insulation XRD figure spectrum.
Embodiment
It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
Introduce as background technology part, preparing in the process of ceramic thermal insulation plate take flyash as raw material, there is the poor problem of tensile strength in prepared warming plate, just in order to address this problem, a kind of exterior insulation is provided in the present invention, and the raw material of this exterior insulation by weight percentage composition meter comprises: flyash extracts aluminum oxide residue 30%～60%, talcum 5%～15%, coal gangue 5%～15%, solubility promoter 30%～50% and appropriate auxiliary material.
In the present invention, propose first to adopt flyash to extract aluminum oxide residue as the raw material of preparing exterior insulation, both can reasonably utilize residue of aluminum-extracted pulverized fuel ash, and turn waste into wealth and improve the Rate of utilization of residue of aluminum-extracted pulverized fuel ash, and can turn bane into boon and improve environment again.The most important thing is, flyash extracts in aluminum oxide residue and contains higher silicone content and aluminium content, in the time that flyash extracts aluminum oxide residue as raw material making exterior insulation, silicon-dioxide wherein and aluminium sesquioxide react and generate the unique texture with mullite phase in the time of high-temperature fusion, and this structure can make exterior insulation have higher tensile strength.Simultaneously, this residue of aluminum-extracted pulverized fuel ash grain diameter is thinner, and in particle surface and volume, exist mesoporous, activity is very high, while making it prepare exterior insulation as raw material, can at lower temperature, just easily reach molten state and form melt, and the gas that now Oxidation of SiC produces is stayed in melt and formed bubble, make the higher void content that has of the exterior insulation that obtains.The higher performance that makes exterior insulation not only there is lightweight of void content, and thermal conductivity is little, has good heat-insulating property.
Meanwhile, coal gangue is the rock mixing with the common consedimental organic compound of coal and mineral compound in coalification course.Coal gangue is the mixture of carbonaceous, shale and sandy shale, has lower heating value.Coal gangue composition is mainly oxide compound and some rare metal of silicon, aluminium, calcium, magnesium, iron, and its chemical constitution is SiO
2, Al
2o
3, Fe
2o
3, CaO, MgO, TiO
2, P
2o
5, (K
2o+Na
2o), V
2o
5deng.Coal gangue is thrown aside, takies tract.Sulfide in coal gangue is overflowed or leached can atmosphere pollution, farmland and water body.Waste dump also can spontaneous combustion presence of fire, or in avalanche in rainy season, silts river up and cause disaster.Therefore, the processing of coal gangue and comprehensive utilization are more and more subject to the attention of countries in the world.Adopt in the present invention coal gangue as the raw material of preparing exterior insulation, both reduced environmental pollution, improved again the effective rate of utilization of coal gangue.
The present invention extracts aluminum oxide residue and coal gangue as main raw material using flyash first, and make exterior insulation under the effect of other auxiliary materials, for disposal and the utilization of residue of aluminum-extracted pulverized fuel ash and coal gangue provide a kind of new approach, economic benefit and environmental benefit are increased.Meanwhile, by being that raw material can make the exterior insulation making have lighter performance and stronger tensile strength by each composition of the above-mentioned scope of the present invention.
For the performance of the exterior insulation that makes to obtain better, in one of the present invention, preferably in embodiment, the raw material of above-mentioned exterior insulation by weight percentage composition meter comprises: flyash extracts aluminum oxide residue 30%～50%, talcum 5%～10%, coal gangue 5%～10%, fusing assistant 35%～50% and appropriate auxiliary material.Each component content of above-mentioned scope can have lighter performance and stronger tensile strength by worth exterior insulation.
In the raw material of exterior insulation of the present invention, the selection of flyash being extracted to aluminum oxide residue does not have particular requirement, prepares exterior insulation as long as can be used in.In a kind of typical embodiment of the present invention, preferred above-mentioned flyash extracts SiO in aluminum oxide residue
2content be gross weight 30%～50%, Al
2o
3content be gross weight 5.0%～30%, the content of loss on ignition is gross weight 25%～35%.Each component content in above-mentioned scope is conducive to form the exterior insulation of good mechanical performance.Especially at 30%～50% SiO
2al with 5.0%～30% scope
2o
3high-tensile to exterior insulation plays an important role.
In the raw material of exterior insulation of the present invention, the content of the composition to coal gangue and wherein each composition does not have particular requirement yet, as long as wherein contain SiO
2and Al
2o
3.In a kind of preferred embodiment of the present invention, coal gangue by weight percentage composition meter comprises: SiO
240.2%～55.0%, Al
2o
330.0%～40.0%, Fe
2o
30.3%～1.5%, TiO
20.1%～1.0%, CaO0.5%～1.0%, MgO0.05%～0.5%, K
2o0.1%～0.5%, Na
2o0.05%～0.3%, loss on ignition 8.0%～15.0%.The SiO that contains above-mentioned scope
2and Al
2o
3the coal gangue of composition is also beneficial to and makes the exterior insulation making have excellent mechanical property, has improved its suitability as lagging material for building.
There is in order to make to make exterior insulation the performance that is applicable to building exterior wall heat preserving, conventionally in the time making exterior insulation, also add some auxiliary materials to strengthen its fire protection flame retarding, resistance of aging, stability and to reduce the performances such as its thermal conductivity.Those skilled in the art, under instruction of the present invention, have the ability to select suitable auxiliary material.
Above-mentioned accessory package contains by the gross weight of exterior insulation 0.1%～5% stablizer.The consumption of stablizer is not limited to above-mentioned scope, is controlled at and in above-mentioned scope, can makes the stability of exterior insulation good, and safety and firmness is good.Operable stablizer comprises but is not limited to calcium oxide, iron protoxide, ferric oxide or metallic iron in the present invention, and preferential oxidation iron is as stablizer.Above-mentioned auxiliary material also comprises by the whipping agent of the gross weight of exterior insulation 0.1%～5%.The consumption of whipping agent is not limited to above-mentioned scope, is controlled within the scope of this and is conducive to make the void content of exterior insulation higher, makes the dry density of exterior insulation little, and then makes exterior insulation have the performance of lightweight.Operable whipping agent includes but not limited to calcium carbonate, silicon carbide or rhombspar in the present invention, and preferred nitrogen SiClx is as whipping agent.Above-mentioned auxiliary material also comprises by the reductive agent of the gross weight of exterior insulation 0.01%～5%.The consumption of reductive agent is not limited to above-mentioned scope, is controlled at the resistance of aging that is conducive to improve exterior insulation in above-mentioned scope, can with the same life-span of buildings, the more important thing is and can increase its fire-retardant fireproof ability.In the present invention, operable reductive agent includes but not limited to coke powder, Graphite Powder 99 or pulverized anthracite, preferably coke powder.
Above-mentioned exterior insulation provided by the present invention, can be by adopting the raw material of above-mentioned exterior insulation, by the conventional production process preparation of exterior insulation.In a kind of preferred implementation of the present invention, the preparation method of above-mentioned exterior insulation comprises the following steps: (1) is mixed rear wet ball grinding by residue of aluminum-extracted pulverized fuel ash, coal gangue, talcum, solubility promoter and auxiliary material and made slurry; (2) dry slurry forms presoma powder; (3) sintered precursor powder, cooling rear formation exterior insulation.
Above-mentioned preparation method of the present invention is main raw material by residue of aluminum-extracted pulverized fuel ash, coal gangue, and after mixing with other auxiliary materials, carry out wet ball grinding and make slurry, then dry this slurry forms presoma powder, last sintered precursor powder, has just formed exterior insulation after cooling.The operations such as this preparation method is old containing sieve deironing, powder, moulding, and without the pre-treatment such as residue of aluminum-extracted pulverized fuel ash being washed to, preparation is simple.And prepare exterior insulation as raw material by above-mentioned preparation method take residue of aluminum-extracted pulverized fuel ash and coal gangue and there is significant economic benefit and environmental benefit, and the exterior insulation of gained has lightweight and high-tensile feature.
In above-mentioned preparation method of the present invention, when formed slurry is dried, adopt conventional drying means all can, as long as can realize the effect that makes slurry drying.In a kind of preferred embodiment of the present invention, preferably but be not limited to adopt drying process with atomizing or the dry slurry of dry-grinding dispersion technique to form presoma powder.
Adopt above-mentioned drying process with atomizing can in making slurry drying, form presoma powder.In the time adopting this drying process with atomizing to prepare precursor powder, adopt conventional drying process with atomizing, form dry powder.In a kind of preferred implementation of the present invention, in above-mentioned drying process with atomizing, fresh feed pump frequency is 20～80Hz, and input speed is 5～12kg/hr, and drying temperature is 150～220 ℃; Adopt above-mentioned fresh feed pump frequency and input speed to coordinate with above-mentioned drying temperature, can make all slurries be dried with better suited speed, make slurry drying be beneficial to whipping agent in follow-up sintering process and produce bubble to form hole.The presoma powder forming at aforesaid method of the present invention is as long as particulate state, and dry, its grain diameter is not had to special requirement.In a kind of optimal way, presoma particle size distribution range is D
50=30～70 μ m.Presoma particle size distribution range is controlled in above-mentioned scope, is conducive to make formed properties of powder good.
While adopting the dry slurry of bake drying-grinding dispersion technique to form the method for presoma powder, need first be dried slurry, by dried solid abrasive powdered.Although this method need to operate step by step, its requirement to equipment is lower.Be more suitable for factory's use that spray drying unit is not set.In the drying step of this method, adopt conventional dry means, be preferably in the present invention under the bake out temperature of 90～120 ℃ and dry 30～60min.Adopt above-mentioned bake out temperature and drying time to be conducive to keeping in slurry carrying out finish-drying in the situation that each composition performance being constant, in the pulverising step of this method, adopt conventional equipment, preferably adopt in the present invention mill instrument or ball mill to pulverize.The presoma powder forming at aforesaid method of the present invention is as long as particulate state, and dry, its grain diameter is not had to special requirement.
In above-mentioned preparation method's of the present invention step (3), presoma powder is carried out in the step of sintering, preferably just above-mentioned presoma powder packs in refractory-material dies, strikes off rear sintering processes; Preferably the material of refractory-material dies is corundum, cordierite, mullite.These materials have good fire performance, pack presoma powder into while wherein carrying out high temperature sintering good stability, not yielding, and then make the effigurate exterior insulation of tool keep stable shape and performance.
Preferably in above-mentioned steps (3), before packing presoma powder into refractory-material dies, on the inwall of refractory-material dies, form refractory paint or refractory fiber paper, preferably the thickness of refractory paint or refractory fiber paper is 1～2mm, and the present invention's employing on the inwall of refractory-material dies, forms refractory paint or refractory fiber paper does not join the exterior insulation obtaining with refractory-material dies is sticky.The refractory paint of 1～2mm thickness or refractory fiber paper can make exterior insulation have good fire performance, too thickly cause the waste of raw material and increase production cost.Operable refractory paint is aluminum oxide refractory paint in the present invention, and operable refractory fiber paper is aluminosilicate refractory fiber paper ...
Under above-mentioned preparation method's of the present invention guidance, those skilled in the art can, according to used whipping agent with different to the requirement of porosity and pore size, rationally adjust the sintering temperature in sintering step.In a kind of preferred embodiment of the present invention, in above-mentioned steps (3), the temperature of sintering is 1150 ℃～1200 ℃, and sintering time is 30～120min.In the present invention, adopting above-mentioned sintering temperature is to utilize whipping agent at this temperature, can decompose generation carbonic acid gas to form space, and the sintering time of selecting above-mentioned scope can make the voidage of the foamed ceramic lagging material obtaining higher, and then making the dry density of the foamed ceramic lagging material obtaining smaller, this makes the final foamed ceramic lagging material forming have the performance of lightweight.
From above description, can find out, the above embodiments of the present invention have realized following technique effect: the disappearance that the present invention is directed to prior art, utilize residue of aluminum-extracted pulverized fuel ash and coal gangue to prepare exterior insulation for main raw material, be the better approach of disposing and utilize residue of aluminum-extracted pulverized fuel ash and coal gangue, there is again economic benefit and environmental benefit significantly.Meanwhile, improve significantly the mechanical property of exterior insulation.
Further illustrate beneficial effect of the present invention below in conjunction with specific embodiment.
Embodiment 1
The raw material of exterior insulation: residue of aluminum-extracted pulverized fuel ash 30kg, coal gangue 10kg, talcum 15kg, the 31kg that fluxes, stablizer ferrous oxide powder 3.5kg, whipping agent carborundum powder 3kg, reductive agent coke powder 2.5kg.Wherein residue of aluminum-extracted pulverized fuel ash and coal gangue composition are as shown in table 1.
Table 1
The preparation method of exterior insulation:
After residue of aluminum-extracted pulverized fuel ash, coal gangue, talcum, fusing assistant, stablizer, whipping agent and reductive agent are mixed, import in ball grinder, add the water yield of 0.8 times of raw material total amount to carry out wet ball grinding, make slurry;
Adopt fresh feed pump frequency be 40Hz, input speed be 8kg/hr, temperature setting be set to 180 ℃ spray-drying tower be dried above-mentioned slurry and form presoma powder, the presoma particle diameter of formation is D
50=50 μ m.。
Above-mentioned presoma powder is packed on inwall and is formed with in the corundum fireproof mould that thickness is 1mm aluminum oxide refractory paint, strike off rear 1175 ℃ of sintering 60min, obtain the exterior insulation of embodiment 1 after cooling.
Adopt Holland's (Spectris company of Singapore) X'Pert-PRODy2198X x ray diffractometer x, the exterior insulation of embodiment 1 is carried out to material phase analysis, test condition is: CuK alpha-ray, and Ni filtering, tube voltage 40kV, tube current 40mA,
its XRD figure is composed as shown in Figure 1.
As shown in Figure 1, in XRD figure spectrum, there is again the diffraction peak of crystalline phase at the diffuse scattering peak of existing amorphous glass phase.Amorphous glass phase diffuse scattering peak is because composition melting under high temperature becomes melt, process of cooling is because speed of cooling forms soon, and that crystalline phase diffraction peak is retrieved mutually by thing is consistent with PDF standard card No.79-1457, illustrate that this thing is mullite (Mullite) phase mutually, mullite crystal belongs to rhombic system, conventionally be column or elongated needle-like and be radiation bunch shape crystallization, just make the tensile strength of exterior insulation up to 0.84MPa just because of the unique texture of mullite, the dry density of this exterior insulation is also gently to 228.43kg/m3 simultaneously.Therefore, take residue of aluminum-extracted pulverized fuel ash and coal gangue as raw material, take that preparation technology's gained exterior insulation of the present invention has compared with high-tensile.
Embodiment 2
The raw material of exterior insulation: residue of aluminum-extracted pulverized fuel ash 30kg, coal gangue 5.05kg, talcum 7.85kg, fusing assistant 49.65kg, stablizer brown iron oxide 5kg, whipping agent carborundum powder 0.1kg, reductive agent pulverized anthracite 5kg.Wherein residue of aluminum-extracted pulverized fuel ash and coal gangue composition are as shown in table 2.
Table 2
The preparation method of exterior insulation:
After residue of aluminum-extracted pulverized fuel ash, coal gangue, talcum, fusing assistant, stablizer, whipping agent and reductive agent are mixed, import in ball grinder, add the water yield of 0.8 times of raw material total amount to carry out wet ball grinding, make slurry;
Adopt fresh feed pump frequency be 80Hz, input speed be 12kg/hr, temperature setting be set to 220 ℃ spray-drying tower be dried above-mentioned slurry and form presoma powder, the presoma particle diameter of formation is D
50=70 μ m.
Above-mentioned presoma powder is packed on inwall and is formed with in the porzite flame-proof mould that thickness is 2mm aluminum oxide refractory paint, strike off rear 1200 ℃ of sintering 30min, obtain the exterior insulation of embodiment 2 after cooling.
Embodiment 3
The raw material of exterior insulation: residue of aluminum-extracted pulverized fuel ash 59.5kg, coal gangue 5kg, talcum 4.55kg, flux 29.45kg, stabilizer metals iron powder 0.1kg, whipping agent carborundum powder 0.1kg, reductive agent Graphite Powder 99 0.3kg.Wherein residue of aluminum-extracted pulverized fuel ash and coal gangue composition are as shown in table 3.
Table 3
The preparation method of exterior insulation:
After residue of aluminum-extracted pulverized fuel ash, coal gangue, talcum, fusing assistant, stablizer, whipping agent and reductive agent are mixed, import in ball grinder, add the water yield of 0.8 times of raw material total amount to carry out wet ball grinding, make slurry;
Adopting fresh feed pump frequency is that 20Hz, input speed are that 5kg/hr, temperature setting are set to the spray-drying tower of 150 ℃ and are dried above-mentioned slurry and form presoma powder, and the presoma particle diameter of formation is D
50=30 μ m.
Above-mentioned presoma powder is packed on inwall and is formed with in the cordierite fireproof die that thickness is 2mm aluminosilicate refractory fiber paper, strike off rear 1150 ℃ of sintering 120min, obtain the exterior insulation of embodiment 3 after cooling.
Embodiment 4
The raw material of exterior insulation: residue of aluminum-extracted pulverized fuel ash 35kg, coal gangue 10kg, talcum 15kg, flux 31kg, stablizer calcium oxide powder 3.5kg, whipping agent ground dolomite 3kg, reductive agent Graphite Powder 99 2.5kg.Wherein residue of aluminum-extracted pulverized fuel ash and coal gangue composition are as shown in table 4.
Table 4
The preparation method of exterior insulation:
After residue of aluminum-extracted pulverized fuel ash, coal gangue, talcum, the flux of fluxing, stablizer, whipping agent and reductive agent are mixed, import in ball grinder, add the water yield of 0.8 times of raw material total amount to carry out wet ball grinding, make slurry;
Adopt fresh feed pump frequency be 95Hz, input speed be 15kg/hr, temperature setting be set to 250 ℃ spray-drying tower be dried above-mentioned slurry and form presoma powder, the presoma particle diameter of formation is D
50=100 μ m.
Above-mentioned presoma powder is packed on inwall and is formed with in the cordierite fireproof die that thickness is 1mm aluminosilicate refractory fiber paper, strike off rear 1175 ℃ of sintering 60min, obtain the exterior insulation of embodiment 4 after cooling.
The raw material of exterior insulation: residue of aluminum-extracted pulverized fuel ash 40kg, coal gangue 15kg, talcum 5kg, fusing assistant 30kg, stabilizer metals iron powder 0.1kg, whipping agent Paris white 4.89kg, reductive agent Graphite Powder 99 0.01kg.Wherein residue of aluminum-extracted pulverized fuel ash and coal gangue composition are as shown in Table 1 above.
The preparation method of exterior insulation:
By residue of aluminum-extracted pulverized fuel ash, coal gangue, talcum, fusing assistant, stablizer, whipping agent and reductive agent according to weight percent for after mixing, import in ball grinder, add the water yield of 0.8 times of raw material total amount to carry out wet ball grinding, make slurry;
Adopt electric furnace bake drying-disintegrating process to be dried slurry, bake out temperature is 90 ℃, and drying time is 30min, pulverizes through mill instrument, and formation particle diameter is D
50the presoma powder of=50 μ m.
Presoma powder is packed on inwall and is formed with in the cordierite fireproof die that thickness is 1.5mm aluminosilicate refractory fiber paper, strike off rear 1200 ℃ of sintering 45min, obtain the exterior insulation of embodiment 5 after cooling.
Embodiment 6
The raw material of exterior insulation: residue of aluminum-extracted pulverized fuel ash 30kg, coal gangue 10kg, talcum 10kg, fusing assistant 45kg, stablizer calcium oxide powder 2kg, whipping agent carborundum powder 1.5kg, reductive agent pulverized anthracite 1.5kg.Wherein residue of aluminum-extracted pulverized fuel ash and coal gangue composition are as shown in Table 1 above.
The preparation method of exterior insulation:
After residue of aluminum-extracted pulverized fuel ash, coal gangue, talcum, fusing assistant, stablizer, whipping agent and reductive agent are mixed, import in ball grinder, add the water yield of 0.8 times of raw material total amount to carry out wet ball grinding, make slurry;
Adopt electric furnace bake drying-disintegrating process to be dried slurry, bake out temperature is 120 ℃, and drying time is 60min, pulverizes through ball mill, and formation particle diameter is D
50the presoma powder of=60 μ m.
Above-mentioned presoma powder is packed on inwall and is formed with in the porzite flame-proof mould that thickness is 2mm aluminum oxide refractory paint, strike off rear 1200 ℃ of sintering 30min, obtain the exterior insulation of embodiment 6 after cooling.
Embodiment 7
The raw material of exterior insulation: with embodiment 6
The preparation method of exterior insulation:
Adopt the method identical with embodiment 6 to make slurry;
Adopt electric furnace bake drying-disintegrating process to be dried slurry, bake out temperature is 300 ℃, and drying time is 120min, pulverizes through ball mill, and formation particle diameter is D
50the presoma powder of=20 μ m.
Above-mentioned presoma powder is packed on inwall and is formed with in the porzite flame-proof mould that thickness is 2mm aluminum oxide refractory paint, strike off rear 1200 ℃ of sintering 30min, obtain the exterior insulation of embodiment 7 after cooling.
Comparative example 1
The preparation method of exterior insulation:
According to mass percent, following ingredients is mixed: flyash (composition is referring to embodiment 1 in publication number CN102603357) 55%, coal gangue Ninghai soil micro mist (composition is referring to embodiment 1 in publication number CN102603357) 25%, talcum powder 5%, glass powder 14%, silicon carbide micro-powder 1%, be mixed to get compound, then adopting particle diameter is that the alumina balls masonry of 1cm is grinding medium, obtains mixed powder according to the ratio dry ball milling 3h of compound: grinding medium=1:2; Mixed powder is laid in to bottom again and is covered with in the saggar of aluminum oxide powder, be also coated with alumina slurry at saggar wall, mixed powder is laid in to saggar the inside uniformly, the height of mixed powder is 1/3 of saggar height simultaneously; Then under oxidizing atmosphere, between room temperature to 600 ℃, heat 4h, between 600～1000 ℃, heat 5h, between 1000～1250 ℃, heat 5h, after sintering is complete, at 1240 ℃ of insulation 1h, then close blower fan, block flue, furnace cooling, obtains the exterior insulation of comparative example 1.
The exterior insulation obtaining in above-described embodiment 1～7 and comparative example 1 is carried out to Performance Detection, dry density (kg/m
3) detect according to GB/T5486-2008 standard; Thermal conductivity (W/mK, 200 ℃) and thermal conductivity (W/mK, normal temperature) detect according to GB/T10294-2008; Combustionproperty detects according to GB8624-1997; Tensile strength (MPa) detects according to GB/T9641-1988; Detected result is in table 5.
Table 5
From data in table 5, the exterior insulation that the preparation method that embodiment 1～7 adopts the properties of the exterior insulation that preparation method of the present invention obtains to be all better than comparative example 1 obtains.The dry density of the exterior insulation that preparation method of the present invention obtains can be low to moderate 220kg/m
3, make it can be called light foamed ceramic warming plate.And the thermal conductivity of this exterior insulation is little, there is good heat-insulating property, it is applicable to as lagging material used for building exterior wall.The most important thing is, the tensile strength of exterior insulation of the present invention is far longer than the tensile strength of exterior insulation of the prior art, and this has better processing use properties with regard to the exterior insulation that preparation method of the present invention is obtained.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. an exterior insulation, it is characterized in that, the raw material of described exterior insulation by weight percentage composition meter comprises: flyash extracts aluminum oxide residue 30%～60%, talcum 5%～15%, coal gangue 5%～15%, fusing assistant molten 30%～50% and appropriate auxiliary material.
2. exterior insulation according to claim 1, it is characterized in that, the raw material of described exterior insulation by weight percentage composition meter comprises: flyash extracts aluminum oxide residue 30%～50%, coal gangue 5%～10%, talcum 5%～10%, fusing assistant molten 35%～50% and appropriate auxiliary material.
3. exterior insulation according to claim 1 and 2, is characterized in that, described flyash extracts SiO in aluminum oxide residue
2content be gross weight 30%～50%, Al
2o
3content be gross weight 5.0%～30%, loss on ignition is gross weight 25%～35%.
4. exterior insulation according to claim 1 and 2, is characterized in that, described coal gangue by weight percentage composition meter comprises: SiO
240.2%～55.0%, Al
2o
330.0%～40.0%, K
2o0.1%～0.5%, Na
2o0.05%～0.3%, CaO0.5%～1.0%, MgO0.05%～0.5%, TiO
20.1%～1.0%, Fe
2o
30.3%～1.5%, loss on ignition 8.0%～15.0%.
5. exterior insulation according to claim 1 and 2, is characterized in that, described auxiliary material comprises by the gross weight of described exterior insulation: stablizer 0.1%～5%, whipping agent 0.1%～5%, reductive agent 0.01%～5%.
6. a preparation method for the exterior insulation described in any one in claim 1 to 5, is characterized in that, comprises the following steps:
(1) residue of aluminum-extracted pulverized fuel ash, coal gangue, talcum, fusing assistant and auxiliary material are mixed to rear wet ball grinding and make slurry;
(2) dry described slurry forms presoma powder;
(3) presoma powder described in sintering, the described exterior insulation of cooling rear formation.
7. preparation method according to claim 6, is characterized in that, in described step (2), adopts the dry described slurry of drying process with atomizing to form presoma powder, or adopts the dry described slurry of bake drying-grinding dispersion technique to form presoma powder.
8. preparation method according to claim 6, is characterized in that, in described step (3), described presoma powder is packed in refractory-material dies, strikes off rear sintering processes; The material of preferred described refractory-material dies is corundum, cordierite or mullite.
9. preparation method according to claim 8, it is characterized in that, in described step (3), before packing described presoma powder into refractory-material dies, on the inwall of described refractory-material dies, form refractory paint or refractory masses, the thickness of preferred described refractory paint or refractory masses is 1～2mm.
10. according to preparation method described in any one in claim 6 to 9, it is characterized in that, in described step (3), the temperature of described sintering is 1150 ℃～1200 ℃, and described sintering time is 30～120min.
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| CN104072193A (en) * | 2014-06-26 | 2014-10-01 | 鄂尔多斯市紫荆创新研究院 | Foamed ceramic material based on silicon-aluminum-containing solid waste and method for preparing fireproof thermal insulation board |
| CN104788121A (en) * | 2015-04-20 | 2015-07-22 | 武汉科技大学 | Mullite lightweight refractory material and preparation method thereof |
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| CN104072193A (en) * | 2014-06-26 | 2014-10-01 | 鄂尔多斯市紫荆创新研究院 | Foamed ceramic material based on silicon-aluminum-containing solid waste and method for preparing fireproof thermal insulation board |
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| CN104788121B (en) * | 2015-04-20 | 2016-08-24 | 武汉科技大学 | A kind of mullite light refractory material and preparation method thereof |
| CN106083178A (en) * | 2016-06-12 | 2016-11-09 | 浙江孚瓯科技有限公司 | Preparation method of insulation and decoration dividing plate and products thereof |
| CN106083014A (en) * | 2016-06-12 | 2016-11-09 | 浙江孚瓯科技有限公司 | Preparation method of foaming building stones roof heat insulation brick and products thereof |
| CN106083170A (en) * | 2016-06-12 | 2016-11-09 | 浙江孚瓯科技有限公司 | Preparation method of foaming colored stone heat insulating decorative board and products thereof |
| CN107032819A (en) * | 2017-04-17 | 2017-08-11 | 中国神华能源股份有限公司 | A kind of method that utilization white clay produces foamed ceramic fire-retardant heat-insulation material |
| CN110903104A (en) * | 2018-09-17 | 2020-03-24 | 中国科学院过程工程研究所 | Method for preparing foamed ceramic and co-producing calcium chloride and polyaluminium chloride by fluidized bed fly ash |
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