CN103803943B - Exterior insulation and preparation method thereof - Google Patents

Exterior insulation and preparation method thereof Download PDF

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Publication number
CN103803943B
CN103803943B CN201310687782.6A CN201310687782A CN103803943B CN 103803943 B CN103803943 B CN 103803943B CN 201310687782 A CN201310687782 A CN 201310687782A CN 103803943 B CN103803943 B CN 103803943B
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exterior insulation
preparation
coal gangue
refractory
residue
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CN103803943A (en
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郭昭华
栗海峰
陈东
雷新荣
袁明
周俊
罗学维
王丹妮
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China Shenhua Energy Co Ltd
Shenhua Zhunneng Resources Development and Utilisation Co Ltd
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China Shenhua Energy Co Ltd
Shenhua Zhunneng Resources Development and Utilisation Co Ltd
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Abstract

The invention discloses a kind of exterior insulation and preparation method thereof.The raw material weight percentage of this exterior insulation comprises: flyash extraction aluminum oxide residue 30% ~ 60%, talcum 5% ~ 15%, coal gangue 5% ~ 15%, fusing assistant melt 30% ~ 50% and appropriate auxiliary material.The present invention is by making exterior insulation using flyash extraction aluminum oxide residue and coal gangue as main raw material, and the disposal and the utilization that are not only residue of aluminum-extracted pulverized fuel ash and coal gangue provide a kind of new approach, add economic benefit and environmental benefit; And, also make exterior insulation of the present invention have lightweight and high-tensile performance.

Description

Exterior insulation and preparation method thereof
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 primary solids refuse that coal-burning power plant discharges.Shi Ge big coal country of China take coal as the basic fuel of electrical production, and 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 process, will produce airborne dust, atmosphere pollution; River can be caused 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 solve China's electrical production environmental pollution, the important means of contradiction between resource shortage.
In order to flyash is turned waste into wealth, recycle, disclosing one with flyash at Chinese invention patent " preparation method of hole exterior insulation of holding one's breath " (open (bulletin) number: CN102603357A) is main raw material, auxiliary with Ninghai soil micro mist, talcum powder, and with glass powder be that solubility promoter sinters under 1230 ~ 1260 DEG C of oxidizing atmosphere and furnace cooling obtains exterior insulation after being incubated 0.5 ~ 2h, gained exterior insulation is held one's breath porosity more than 75%, and tensile strength reaches 0.2MPa.Although exterior insulation tensile strength values can obtain about 0.2MPa prepared by this method, its mechanical property still needs to improve with satisfied 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, provide a kind of exterior insulation, the raw material weight percentage of this exterior insulation comprises: flyash extracts aluminum oxide residue 30% ~ 60%, talcum 5% ~ 15%, coal gangue 5% ~ 15%, fusing assistant 30% ~ 50% and appropriate auxiliary material.
Further, the raw material weight percentage of above-mentioned exterior insulation comprises: flyash extracts aluminum oxide residue 30% ~ 50%, coal gangue 5% ~ 10%, talcum 5% ~ 10%, fusing assistant 35% ~ 50% and appropriate auxiliary material.
Further, above-mentioned flyash extracts SiO in aluminum oxide residue 2content be 30% ~ 50%, Al of gross weight 2o 3content be 5.0% ~ 30% of gross weight, loss on ignition is 25% ~ 35% of gross weight.
Further, above-mentioned coal gangue weight percentage 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%.
Further, above-mentioned auxiliary material comprises by the total 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, provide a kind of preparation method requiring the exterior insulation any one of 1 to 5, the method comprises the following steps: wet ball grinding after the mixing of residue of aluminum-extracted pulverized fuel ash, coal gangue, talcum, fusing assistant and auxiliary material is obtained slurry by (1); (2) dry above-mentioned slurry forms presoma powder; (3) sinter above-mentioned presoma powder, after cooling, form above-mentioned exterior insulation.
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 loaded in refractory-material dies, strikes 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 above-mentioned presoma powder is loaded refractory-material dies, the inwall of above-mentioned refractory-material dies forms refractory paint or refractory masses, and 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 DEG C ~ 1200 DEG C, 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.Making exterior insulation by extracting aluminum oxide residue and coal gangue using flyash as main raw material, for the disposal of residue of aluminum-extracted pulverized fuel ash and coal gangue and utilization provide a kind of new approach, adding economic benefit and environmental benefit.Meanwhile, exterior insulation of the present invention is made to have lighter performance and stronger tensile strength.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows and composes according to the embodiment of the present invention 1 exterior insulation XRD figure.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Introduce as background technology part, be that raw material is prepared in the process of ceramic thermal insulation plate with flyash, there is the poor problem of tensile strength in prepared warming plate, just in order to address this problem, provide a kind of exterior insulation in the present invention, the raw material weight percentage of this exterior insulation 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 preparing exterior insulation, both reasonably can utilize residue of aluminum-extracted pulverized fuel ash, turn waste into wealth and improve the Rate of utilization of residue of aluminum-extracted pulverized fuel ash, can turn bane into boon again environmental protect.The most important thing is, flyash extracts in aluminum oxide residue containing higher silicone content and aluminium content, when flyash extracts aluminum oxide residue as raw material making exterior insulation, silicon-dioxide wherein and aluminium sesquioxide react the unique texture generating and have mullite phase when high-temperature fusion, this structure can make exterior insulation have higher tensile strength.Simultaneously, this residue of aluminum-extracted pulverized fuel ash grain diameter is thinner, and exist in particle surface and volume mesoporous, activity is very high, just can easily reach molten state at a lower temperature when making it prepare exterior insulation as raw material and form melt, and the gas that now Oxidation of SiC produces stays and forms bubble in the melt, what make the exterior insulation obtained has higher void content.The higher performance making exterior insulation not only have lightweight of void content, and thermal conductivity is little, has good heat-insulating property.
Meanwhile, coal gangue is the rock that common consedimental organic compound and mineral compound mix with coal in coalification course.Coal gangue is the mixture of carbonaceous, shale and sandy shale, has lower heating value.Coal gangue composition is the oxide compound of silicon, aluminium, calcium, magnesium, iron and some rare metal mainly, 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 effusion in coal gangue or leaching meeting 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 process of coal gangue and comprehensive utilization are more and more subject to the attention of countries in the world.Adopt coal gangue as the raw material preparing exterior insulation in the present invention, both decreased environmental pollution, and turn improved 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 exterior insulation is made under the effect of other auxiliary materials, for the disposal of residue of aluminum-extracted pulverized fuel ash and coal gangue and utilization provide a kind of new approach, add economic benefit and environmental benefit.Meanwhile, by being that raw material can make the exterior insulation obtained have lighter performance and stronger tensile strength by each composition of above-mentioned for the present invention scope.
In order to make the performance of the exterior insulation obtained better, be preferably in embodiment in one of the present invention, the raw material weight percentage of above-mentioned exterior insulation comprises: flyash extracts aluminum oxide residue 30% ~ 50%, talcum 5% ~ 10%, coal gangue 5% ~ 10%, fusing assistant 35% ~ 50% and appropriate auxiliary material.The exterior insulation that each component content of above-mentioned scope can be worth has lighter performance and stronger tensile strength.
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, as long as can be used in preparing exterior insulation.In a kind of typical embodiment of the present invention, preferred above-mentioned flyash extracts SiO in aluminum oxide residue 2content be 30% ~ 50%, Al of gross weight 2o 3content be 5.0% ~ 30% of gross weight, the content of loss on ignition is 25% ~ 35% of gross weight.Each component content in above-mentioned scope is conducive to the exterior insulation forming good mechanical performance.Especially 30% ~ 50% SiO 2with the Al of 5.0% ~ 30% scope 2o 3the high-tensile of exterior insulation is played an important role.
In the raw material of exterior insulation of the present invention, particular requirement is not had, as long as wherein containing SiO to the content of the composition of coal gangue and wherein each composition yet 2and Al 2o 3.In a kind of preferred embodiment of the present invention, coal gangue weight percentage 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%.SiO containing above-mentioned scope 2and Al 2o 3the coal gangue of composition is also beneficial to the exterior insulation making to obtain and has excellent mechanical property, improves its suitability as lagging material for building.
Being applicable to the performance of building exterior wall heat preserving in order to make obtained exterior insulation have, usually also adding some auxiliary materials to strengthen its fire protection flame retarding, resistance of aging, stability and to reduce the performances such as its thermal conductivity when making exterior insulation.Those skilled in the art under the teachings of the present invention, have the ability to select suitable auxiliary material.
Above-mentioned accessory package is containing total weight 0.1% ~ 5% stablizer pressing exterior insulation.The consumption of stablizer is not limited to above-mentioned scope, and controlled can make the stability of exterior insulation good in above-mentioned scope, safety and firmness is good.Operable stablizer includes but 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 the whipping agent of the total weight 0.1% ~ 5% by exterior insulation.The consumption of whipping agent is not limited to above-mentioned scope, is controlled within the scope of this, be conducive to making 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 the reductive agent of the total weight 0.01% ~ 5% by exterior insulation.The consumption of reductive agent is not limited to above-mentioned scope, is controlled to be conducive in above-mentioned scope the resistance of aging improving exterior insulation, can the life-span same with 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, preferred coke powder.
Above-mentioned exterior insulation provided by the present invention, by adopting the raw material of above-mentioned exterior insulation, can be prepared by the conventional production process of exterior insulation.In the preferred embodiment of the present invention, the preparation method of above-mentioned exterior insulation comprises the following steps: wet ball grinding after the mixing of residue of aluminum-extracted pulverized fuel ash, coal gangue, talcum, solubility promoter and auxiliary material is obtained slurry by (1); (2) dry slurry forms presoma powder; (3) sintered precursor powder, forms exterior insulation after cooling.
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 obtain slurry, then this slurry dry forms presoma powder, last sintered precursor powder, just defines exterior insulation after cooling.This preparation method is not containing the operation such as deironing of sieving, powder be old, shaping, and without the need to carrying out the pre-treatment such as washing to residue of aluminum-extracted pulverized fuel ash, preparation is simple.And prepare exterior insulation for raw material by above-mentioned preparation method with residue of aluminum-extracted pulverized fuel ash and coal gangue and have 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 drying is carried out to formed slurry, adopt conventional drying means, as long as the effect making slurry drying can be realized.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 drying-grinding dispersion technique to form presoma powder.
Adopt above-mentioned drying process with atomizing can form presoma powder while making slurry drying.When adopting this drying process with atomizing to prepare precursor powder, adopting conventional drying process with atomizing, forming dry powder.In the preferred embodiment 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 DEG C; Adopt above-mentioned fresh feed pump frequency and input speed to coordinate with above-mentioned drying temperature, all slurries can be made to carry out drying with better suited speed, make slurry drying be beneficial to whipping agent in follow-up sintering process and produce bubble to form hole.As long as the presoma powder particulate state that method of stating on the invention is formed, and drying, the requirement not special to its grain diameter.In a kind of optimal way, presoma particle size distribution range is D 50=30 ~ 70 μm.Presoma particle size distribution range is controlled in above-mentioned scope, be conducive to making formed properties of powder good.
When adopting the dry slurry of bake drying-grinding dispersion technique to form the method for presoma powder, need first to carry out drying to slurry, by dried solid abrasive powdered.Although this method needs to operate step by step, it is lower to the requirement of equipment.Be more suitable for the factory not arranging spray drying unit to use.In the drying step of this method, adopt conventional dry means, be preferably in the present invention and dry 30 ~ 60min under the bake out temperature of 90 ~ 120 DEG C.Above-mentioned bake out temperature and drying time is adopted to be conducive to when keeping carrying out finish-drying each composition performance is constant in slurry, in the pulverising step of this method, adopt conventional equipment, preferably adopt mill instrument or ball mill to pulverize in the present invention.As long as the presoma powder particulate state that method of stating on the invention is formed, and drying, the requirement not special to its grain diameter.
In the step (3) of above-mentioned preparation method of the present invention, in the step sinter presoma powder, preferably just above-mentioned presoma powder loads in refractory-material dies, strikes off rear sintering processes; The material of preferred refractory-material dies is corundum, cordierite, mullite.These materials have good fire performance, and presoma powder is loaded good stability when wherein carrying out high temperature sintering, not yielding, and then make the effigurate exterior insulation of tool keep stable shape and performance.
In preferred above-mentioned steps (3), before presoma powder is loaded refractory-material dies, the inwall of refractory-material dies is formed refractory paint or refractory fiber paper, the thickness of preferred refractory paint or refractory fiber paper is 1 ~ 2mm, and the present invention adopts on the inwall of refractory-material dies, forms that exterior insulation that refractory paint or refractory fiber paper make to obtain is sticky with refractory-material dies to be joined.The refractory paint of 1 ~ 2mm thickness or refractory fiber paper can make exterior insulation have excellent fire performance, too thickly cause the waste of raw material and increase production cost.Operable refractory paint is alumina setter coating in the present invention, and operable refractory fiber paper is aluminosilicate refractory fiber paper ...
Under the guidance of above-mentioned preparation method of the present invention, those skilled in the art can be different with to the requirement of porosity and pore size according to used whipping agent, carry out Reasonable adjustment to 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 DEG C ~ 1200 DEG C, and sintering time is 30 ~ 120min.Above-mentioned sintering temperature is adopted to be utilize whipping agent can decompose at such a temperature to generate carbonic acid gas to form space in the present invention, and the voidage of the foamed ceramic lagging material selecting the sintering time of above-mentioned scope can make to obtain is higher, and then making the dry density of the foamed ceramic lagging material obtained smaller, this makes the final foamed ceramic lagging material formed have the performance of lightweight.
From above description, can find out, the above embodiments of the present invention achieve following technique effect: the disappearance that the present invention is directed to prior art, residue of aluminum-extracted pulverized fuel ash and coal gangue is utilized to prepare exterior insulation for main raw material, be the better approach disposing and utilize residue of aluminum-extracted pulverized fuel ash and coal gangue, there is again economic benefit and environmental benefit significantly.Meanwhile, the mechanical property of exterior insulation is improved significantly.
Beneficial effect of the present invention is further illustrated 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 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 being mixed, import in ball grinder, the water yield adding raw material total amount 0.8 times carries out wet ball grinding, obtained slurry;
Adopt that fresh feed pump frequency is 40Hz, input speed is 8kg/hr, temperature be set to 180 DEG C spray-drying tower carry out dry above-mentioned slurry and form presoma powder, the presoma particle diameter of formation is D 50=50 μm.。
Above-mentioned presoma powder is loaded inwall is formed with thickness is in the corundum fireproof mould of 1mm alumina setter coating, strike off rear 1175 DEG C of sintering 60min, after cooling, obtain the exterior insulation of embodiment 1.
Adopt Holland's (Spectris company of Singapore) X'Pert-PRODy2198X x ray diffractometer x, carry out material phase analysis to the exterior insulation of embodiment 1, test condition is: CuK alpha-ray, Ni filtering, tube voltage 40kV, tube current 40mA, its XRD figure spectrum 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 is melted into melt under high temperature, process of cooling is formed soon due to speed of cooling, and crystalline phase diffraction peak is retrieved consistent with PDF standard card No.79-1457 mutually by thing, illustrate that this thing is mullite (Mullite) phase mutually, mullite crystal belongs to rhombic system, usually in column or elongated needle-like and in the crystallization of radiation tufted, unique texture just because of mullite just makes the tensile strength of exterior insulation up to 0.84MPa, and the dry density of this exterior insulation is also light to 228.43kg/m3 simultaneously.Therefore, with residue of aluminum-extracted pulverized fuel ash and coal gangue for raw material, the comparatively high-tensile that preparation technology's gained exterior insulation of the present invention has is taked.
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 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 being mixed, import in ball grinder, the water yield adding raw material total amount 0.8 times carries out wet ball grinding, obtained slurry;
Adopt that fresh feed pump frequency is 80Hz, input speed is 12kg/hr, temperature be set to 220 DEG C spray-drying tower carry out dry above-mentioned slurry and form presoma powder, the presoma particle diameter of formation is D 50=70 μm.
Above-mentioned presoma powder is loaded inwall is formed with thickness is in the porzite flame-proof mould of 2mm alumina setter coating, strike off rear 1200 DEG C of sintering 30min, after cooling, obtain the exterior insulation of embodiment 2.
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 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 being mixed, import in ball grinder, the water yield adding raw material total amount 0.8 times carries out wet ball grinding, obtained slurry;
Adopt that fresh feed pump frequency is 20Hz, input speed is 5kg/hr, spray-drying tower that temperature is set to 150 DEG C carries out dry above-mentioned slurry and form presoma powder, the presoma particle diameter of formation is D 50=30 μm.
Above-mentioned presoma powder is loaded inwall is formed with thickness is in the cordierite fireproof die of 2mm aluminosilicate refractory fiber paper, strike off rear 1150 DEG C of sintering 120min, after cooling, obtain the exterior insulation of embodiment 3.
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 as shown in table 4.
Table 4
The preparation method of exterior insulation:
After residue of aluminum-extracted pulverized fuel ash, coal gangue, talcum, flux of fluxing, stablizer, whipping agent and reductive agent mixing, import in ball grinder, the water yield adding raw material total amount 0.8 times carries out wet ball grinding, obtained slurry;
Adopt that fresh feed pump frequency is 95Hz, input speed is 15kg/hr, temperature be set to 250 DEG C spray-drying tower carry out dry above-mentioned slurry and form presoma powder, the presoma particle diameter of formation is D 50=100 μm.
Above-mentioned presoma powder is loaded inwall is formed with thickness is in the cordierite fireproof die of 1mm aluminosilicate refractory fiber paper, strike off rear 1175 DEG C of sintering 60min, after cooling, obtain the exterior insulation of embodiment 4.
Embodiment 5
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, the water yield adding raw material total amount 0.8 times carries out wet ball grinding, obtained slurry;
Adopt electric furnace bake drying-disintegrating process to carry out drying to slurry, bake out temperature is 90 DEG C, and drying time is 30min, and pulverize through mill instrument, formation particle diameter is D 50the presoma powder of=50 μm.
Presoma powder is loaded inwall is formed with thickness is in the cordierite fireproof die of 1.5mm aluminosilicate refractory fiber paper, strike off rear 1200 DEG C of sintering 45min, after cooling, obtain the exterior insulation of embodiment 5.
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 being mixed, import in ball grinder, the water yield adding raw material total amount 0.8 times carries out wet ball grinding, obtained slurry;
Adopt electric furnace bake drying-disintegrating process to carry out drying to slurry, bake out temperature is 120 DEG C, and drying time is 60min, and pulverize through ball mill, formation particle diameter is D 50the presoma powder of=60 μm.
Above-mentioned presoma powder is loaded inwall is formed with thickness is in the porzite flame-proof mould of 2mm alumina setter coating, strike off rear 1200 DEG C of sintering 30min, after cooling, obtain the exterior insulation of embodiment 6.
Embodiment 7
The raw material of exterior insulation: with embodiment 6
The preparation method of exterior insulation:
The method identical with embodiment 6 is adopted to obtain slurry;
Adopt electric furnace bake drying-disintegrating process to carry out drying to slurry, bake out temperature is 300 DEG C, and drying time is 120min, and pulverize through ball mill, formation particle diameter is D 50the presoma powder of=20 μm.
Above-mentioned presoma powder is loaded inwall is formed with thickness is in the porzite flame-proof mould of 2mm alumina setter coating, strike off rear 1200 DEG C of sintering 30min, after cooling, obtain the exterior insulation of embodiment 7.
Comparative example 1
The preparation method of exterior insulation:
According to mass percent, following ingredients is mixed: flyash (composition is see embodiment 1 in publication number CN102603357) 55%, coal gangue Ninghai soil micro mist (composition is see embodiment 1 in publication number CN102603357) 25%, talcum powder 5%, glass powder 14%, silicon carbide micro-powder 1%, be mixed to get compound, then employing particle diameter is the alumina balls masonry of 1cm is grinding medium, according to compound: the ratio dry ball milling 3h of grinding medium=1:2 obtains mixed powder; Mixed powder being laid in bottom is covered with in the saggar of aluminum oxide powder again, and be also coated with alumina slurry at saggar wall, be laid in uniformly inside saggar by mixed powder, the height of mixed powder is 1/3 of saggar height simultaneously; Then under oxidizing atmosphere, between room temperature is to 600 DEG C, heat 4h, between 600 ~ 1000 DEG C, heat 5h, between 1000 ~ 1250 DEG C, heat 5h, at 1240 DEG C of insulation 1h after having sintered, then close blower fan, block flue, furnace cooling, obtain the exterior insulation of comparative example 1.
Performance Detection is carried out to the exterior insulation obtained in above-described embodiment 1 ~ 7 and comparative example 1, dry density (kg/m 3) detect according to GB/T5486-2008 standard; Thermal conductivity (W/mK, 200 DEG C) 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 the properties of exterior insulation that embodiment 1 ~ 7 adopts preparation method of the present invention to obtain all is 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, make it be 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 with regard to the exterior insulation making preparation method of the present invention and obtain better processes use properties.
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 amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (12)

1. an exterior insulation, it is characterized in that, the raw material weight percentage of described exterior insulation comprises: flyash extracts aluminum oxide residue 30% ~ 60%, talcum 5% ~ 15%, coal gangue 5% ~ 15%, fusing assistant 30% ~ 50% and appropriate auxiliary material, and each raw material weight content sum is 100%, described auxiliary material comprises stablizer, whipping agent and reductive agent.
2. exterior insulation according to claim 1, it is characterized in that, the raw material weight percentage of described exterior insulation comprises: flyash extracts aluminum oxide residue 30% ~ 50%, coal gangue 5% ~ 10%, talcum 5% ~ 10%, fusing assistant 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 30% ~ 50%, Al of gross weight 2o 3content be 5.0% ~ 30% of gross weight, loss on ignition is 25% ~ 35% of gross weight.
4. exterior insulation according to claim 1 and 2, is characterized in that, described coal gangue weight percentage 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 total 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 according to any one of claim 1 to 5, is characterized in that, comprises the following steps:
(1) wet ball grinding after the mixing of residue of aluminum-extracted pulverized fuel ash, coal gangue, talcum, fusing assistant and auxiliary material is obtained slurry;
(2) dry described slurry forms presoma powder;
(3) sinter described presoma powder, after cooling, form described exterior insulation.
7. preparation method according to claim 6, it is characterized in that, in described step (2), adopt the dry described slurry of drying process with atomizing to form presoma powder, or adopt 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), is loaded in refractory-material dies by described presoma powder, strikes off rear sintering processes.
9. preparation method according to claim 8, it is characterized in that, the material of described refractory-material dies is corundum, cordierite or mullite.
10. preparation method according to claim 8, is characterized in that, in described step (3), before described presoma powder is loaded refractory-material dies, the inwall of described refractory-material dies forms refractory paint or refractory masses.
11. preparation methods according to claim 10, it is characterized in that, the thickness of described refractory paint or refractory masses is 1 ~ 2mm.
12. according to any one of claim 6 to 11 preparation method, it is characterized in that, in described step (3), the temperature of described sintering is 1150 DEG C ~ 1200 DEG C, and described sintering time is 30 ~ 120min.
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CN104072193B (en) * 2014-06-26 2015-12-09 鄂尔多斯市紫荆创新研究院 Based on silicon-aluminum containing solid waste foamed ceramic material and prepare the method for fireproof heated board
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
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
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
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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