CN103234346A - Low-heat-conduction multi-layer mullite brick and preparation method thereof - Google Patents
Low-heat-conduction multi-layer mullite brick and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a low-heat-conduction multi-layer mullite brick and a preparation method thereof. Mullite with low heat conduction coefficient is utilized as a main raw material, a small amount of silicon carbide is added, a novel binding agent is utilized to replace clay, and a multi-layer composite structure is adopted. The heat conduction coefficient of a product is far lower than that of like products, thermal shock resistance and corrosion resistance of the product are greatly improved by means of excellent high temperature performance of the mullite, the service life of the product is prolonged, and simultaneously the energy-saving and consumption-reducing effect is obvious.
Description
Technical field
The present invention relates to fire-resistant environmental protection material technology field, be specifically related to a kind of low heat conduction MULTILAYER COMPOSITE mullite brick and preparation method thereof.
Background technology
Intermediate zone up and down and the clinkering zone of new type nonaqueous cement rotary kiln are adjacent, are usually standing the environment for use harsher than clinkering zone, are the most scabrous positions in the selection of whole cement kiln system, and this one generally uses siliceous mullite brick to be lining brick now.
The siliceous mullite brick that existing market is sold uses one-level or superfine bauxite mostly, indivedual enterprises also are added with electro-corundum to improve product high-temperature behavior and corrosion resistance, but this has increased the thermal conductivity factor of siliceous mullite brick simultaneously, increasing of thermal conductivity factor makes that the interior thermal loss of cement kiln is very fast, ton cement fuel consumption consumption increases, barrel temperature raises, cylindrical shell is deformed, cause cylindrical shell to shorten service life, the cylindrical shell of distortion makes refractory material bricking unbalance stress in the kiln, easily send out fracture and damaged, cause bricking to reduce service life.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect of prior art, a kind of low heat conduction MULTILAYER COMPOSITE mullite brick and preparation method thereof is provided, should be used for replacing existing siliceous mullite brick by low heat conduction MULTILAYER COMPOSITE mullite brick, to solve the cement kiln use problem of intermediate zone bricking up and down.
A kind of low heat conduction MULTILAYER COMPOSITE mullite brick of the present invention and preparation method thereof is achieved through the following technical solutions:
A kind of low heat conduction MULTILAYER COMPOSITE mullite brick, it comprises working lining, thermal insulation layer and heat insulation layer, described working lining links to each other with thermal insulation layer, at thermal insulation layer a breach is arranged, and heat insulation layer is positioned at this breach; Working lining is by aggregate, it is formulated according to the following weight parts proportioning that powder and antioxidant add new junction agent: 45～60 parts in aggregate, wherein the fused mullite of granularity 0～1mm is 10～15 parts, 15～20 parts of the fused mullites of granularity 1～3mm, 20～25 parts of the fused mullites of granularity 3～5mm, the chemical composition mass percent of fused mullite is: mullite phase 80～90%, Fe
2O
3＜0.8%, K
2O+Na
2O＜0.3%, 37～45 parts of powders, 30～35 parts of the fused mullites of granularity＜0.074mm, 7～10 parts in the carborundum of granularity＜0.074mm, the chemical composition mass percent of carborundum is: SiC＞97%, 3～5 parts of antioxidants, antioxidant be metallic aluminium powder and metallic silicon power by 1～2: 1 weight ratio mixes, its particle mean size＜0.05mm, 4～5 parts of new junction agents, new junction agent is low sodium Ludox, and its chemical composition mass percent is: Na
2O＜0.006%, SiO
2＞30%; Thermal insulation layer is that to add the macromolecule bond by aggregate and powder formulated according to the following weight parts proportioning: 45～70 parts in aggregate, wherein the fused mullite of granularity 0～1mm is 10～15 parts, 20～30 parts of the fused mullites of granularity 1～3mm, 15～25 parts of the high-strength light mullite aggregates of granularity 1～2mm, the chemical composition mass percent of high-strength light mullite aggregate is: mullite phase＞60%, bulk density＜1.3g/cm
3, the porosity＞50%, 35～55 parts of powders, comprise mixing fine powders and compound organic pore-forming agents, wherein mixing fine powders is 30～40 parts, the weight portion proportioning of mixing fine powders consists of: 35～65 parts of fused mullites, 15～30 parts of α-alumina powders, 10～15 parts of silicon powders, 10～15 parts of bonding clays, the chemical composition mass percent of α-alumina powder is: α-Al
2O
3Phase＞93%, the chemical composition mass percent of silicon powder is: SiO
2＞99%, the chemical composition mass percent of bonding clay is: Al
2O
333～40%, Fe
2O
3＜1.3%, wherein compound organic pore-forming agents is 5～15 parts, compound organic pore-forming agents is rice hull ash with anchracite duff by 1～3: 1～2 mass ratio mixes, particle mean size＜0.05mm, 4～5 parts of macromolecule bonds, the macromolecule bond is the polyvinyl alcohol liquation, and its molecular weight is 25～300,000, and concentration is 1.01-1.02g/cm
3Heat insulation layer is an alumina fibre cotton, 1000 ℃ of the cotton thermal conductivity factor＜0.03W/mK of alumina fibre, and maximum operation (service) temperature is 1350 ~ 1450 ℃.
As preferably, described indentations section is trapezoidal, rectangle or other geometries.
As preferably, the preparation method of described mixing fine powders grinds its particle mean size＜0.074mm jointly for the raw material with proportioning composition amount.
The preparation method:
The first step, batching:
Working lining: the particulate material that will be not less than 0.074mm was put into kolleroang adding new junction agent mixed grind 5 minutes, it is standby to add behind the residue powder mixed grind 10 minutes then successively, thermal insulation layer: the particulate material that will be not less than 0.074mm is put into kolleroang and was added the new junction agent mixed grind 5 minutes, and it is standby to add behind the residue powder mixed grind 10 minutes then successively;
Second step, finish the batching back and with dividing plate mould is divided into two parts that the length ratio is 1 ~ 3:1 ~ 2, the pug with working lining and thermal insulation layer adds two compartments respectively, adopts the punch forming of 630T friction press behind the extraction dividing plate;
In the 3rd step, the adobe air dry after 24 hours, was dried 24 hours for 110 ℃;
In the 4th step, burn till:
Formed green brick was taken out by 110 ℃ of oven dry after 24 hours, and loading of kiln is in 1380 ℃～1450 ℃ insulations cooling after 5 hours, and the indentation, there that the alumina fibre cotton is bonded to cooling back goods had both obtained this goods.
Adopting the novel mullite brick of our company's invention is working lining, and this product thermal conductivity ratio like product is low, and the intensity height relies on the mullite high-temperature behavior of excellence mutually, can significantly improve thermal shock resistance and the corrosion resistance of product.Adopting the novel light mullite brick of our company's invention is thermal insulation layer, this product cold crushing strength and maximum operation (service) temperature index and cement kiln approach with the anti-peeling high aluminium brick, and body is close and thermal conductivity factor and light weeight alumina brick approach, and can improve effect of heat insulation greatly, and energy conservation and consumption reduction effects is remarkable.Heat insulation layer is at breach of the artificial manufacturing of thermal insulation layer, places the cotton module of the alumina fibre with low heat conductivity and higher serviceability temperature, has further reduced the thermal conductivity factor of product of the present invention.
Compared with prior art, the beneficial effect of a kind of low heat conduction MULTILAYER COMPOSITE mullite brick of the present invention and preparation method thereof is: product of the present invention relies on novel multi-layer compound structure advantage, excellent high temperature serviceability is arranged, its thermal conductivity factor is far below like product simultaneously, use after tested when cement kiln front and back intermediate zone and kiln tail and can reduce the drum surface temperature greatly, with respect to low 2 ~ 3 times of like product on the market.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the profile of Fig. 1;
1 is working lining, and 2 is thermal insulation layer, and 3 is heat insulation layer.
The specific embodiment
Embodiment 1:
Shown in Fig. 1-2, a kind of low heat conduction MULTILAYER COMPOSITE mullite brick, it comprises working lining 1, thermal insulation layer 2 and heat insulation layer 3, described working lining 1 links to each other with thermal insulation layer 2, at thermal insulation layer 2 breach is arranged, and heat insulation layer 3 is positioned at this breach; Working lining 1 is by aggregate, it is formulated according to the following weight parts proportioning that powder and antioxidant add new junction agent: 55 parts in aggregate, wherein the fused mullite of granularity 0～1mm is 10 parts, 20 parts of the fused mullites of granularity 1～3mm, 25 parts of the fused mullites of granularity 3～5mm, the chemical composition mass percent of fused mullite is: mullite phase 80～90%, Fe
2O
3＜0.8%, K
2O+Na
2O＜0.3%, 42 parts of powders, 32 parts of the fused mullites of granularity＜0.074mm, 10 parts in the carborundum of granularity＜0.074mm, the chemical composition mass percent of carborundum is: SiC＞97%, 3 parts of antioxidants, antioxidant be metallic aluminium powder and metallic silicon power by 1～2: 1 weight ratio mixes, its particle mean size＜0.05mm, 4 parts of new junction agents, new junction agent is low sodium Ludox, and its chemical composition mass percent is: Na
2O＜0.006%, SiO
2＞30%; Thermal insulation layer 2 is that to add the macromolecule bond by aggregate and powder formulated according to the following weight parts proportioning: 55 parts in aggregate, wherein the fused mullite of granularity 0～1mm is 10 parts, 25 parts of the fused mullites of granularity 1～3mm, 20 parts of the high-strength light mullite aggregates of granularity 1～2mm, the chemical composition mass percent of high-strength light mullite aggregate is: mullite phase＞60%, bulk density＜1.3g/cm
3, the porosity＞50%, 45 parts of powders, comprise mixing fine powders and compound organic pore-forming agents, wherein mixing fine powders is 40 parts, the weight portion proportioning of mixing fine powders consists of: 35～65 parts of fused mullites, 15～30 parts of α-alumina powders, 10～15 parts of silicon powders, 10～15 parts of bonding clays, the chemical composition mass percent of α-alumina powder is: α-Al
2O
3Phase＞93%, the chemical composition mass percent of silicon powder is: SiO
2＞99%, the chemical composition mass percent of bonding clay is: Al
2O
333～40%, Fe
2O
3＜1.3%, wherein compound organic pore-forming agents is 5 parts, compound organic pore-forming agents is rice hull ash with anchracite duff by 1～3: 1～2 mass ratio mixes, particle mean size＜0.05mm, 4 parts of macromolecule bonds, the macromolecule bond is the polyvinyl alcohol liquation, and its molecular weight is 25～300,000, and concentration is 1.01-1.02g/cm
3 Heat insulation layer 3 is an alumina fibre cotton, 1000 ℃ of the cotton thermal conductivity factor＜0.03W/mK of alumina fibre, and maximum operation (service) temperature is 1350 ~ 1450 ℃.Described indentations section is trapezoidal, rectangle or other geometries.The preparation method of described mixing fine powders grinds its particle mean size＜0.074mm jointly for the raw material with proportioning composition amount.
The preparation method:
The first step, batching:
Working lining 1: the particulate material that will be not less than 0.074mm was put into kolleroang adding new junction agent mixed grind 5 minutes, it is standby to add behind the residue powder mixed grind 10 minutes then successively, thermal insulation layer 2: the particulate material that will be not less than 0.074mm is put into kolleroang and was added the new junction agent mixed grind 5 minutes, and it is standby to add behind the residue powder mixed grind 10 minutes then successively;
Second goes on foot, and finishes the batching back and with dividing plate mould is divided into length than two parts that are 7:3, with working lining 1 two compartments of pug adding with thermal insulation layer 2, adopts the punch forming of 630T friction press behind the extraction dividing plate respectively;
In the 3rd step, the adobe air dry after 24 hours, was dried 24 hours for 110 ℃;
In the 4th step, burn till:
Formed green brick was taken out by 110 ℃ of oven dry after 24 hours, and loading of kiln is in 1380 ℃～1450 ℃ insulations cooling after 5 hours, and the indentation, there that the alumina fibre cotton is bonded to cooling back goods had both obtained this goods.
Implementation result:
Embodiment 2:
Shown in Fig. 1-2, a kind of low heat conduction MULTILAYER COMPOSITE mullite brick, it comprises working lining 1, thermal insulation layer 2 and heat insulation layer 3, described working lining 1 links to each other with thermal insulation layer 2, at thermal insulation layer 2 breach is arranged, and heat insulation layer 3 is positioned at this breach; Working lining 1 is by aggregate, it is formulated according to the following weight parts proportioning that powder and antioxidant add new junction agent: 55 parts in aggregate, wherein the fused mullite of granularity 0～1mm is 15 parts, 20 parts of the fused mullites of granularity 1～3mm, 20 parts of the fused mullites of granularity 3～5mm, the chemical composition mass percent of fused mullite is: mullite phase 80～90%, Fe
2O
3＜0.8%, K
2O+Na
2O＜0.3%, 40 parts of powders, 33 parts of the fused mullites of granularity＜0.074mm, 7 parts in the carborundum of granularity＜0.074mm, the chemical composition mass percent of carborundum is: SiC＞97%, 5 parts of antioxidants, antioxidant be metallic aluminium powder and metallic silicon power by 1～2: 1 weight ratio mixes, its particle mean size＜0.05mm, 5 parts of new junction agents, new junction agent is low sodium Ludox, and its chemical composition mass percent is: Na
2O＜0.006%, SiO
2＞30%; Thermal insulation layer 2 is that to add the macromolecule bond by aggregate and powder formulated according to the following weight parts proportioning: 55 parts in aggregate, wherein the fused mullite of granularity 0～1mm is 10 parts, 25 parts of the fused mullites of granularity 1～3mm, 20 parts of the high-strength light mullite aggregates of granularity 1～2mm, the chemical composition mass percent of high-strength light mullite aggregate is: mullite phase＞60%, bulk density＜1.3g/cm
3, the porosity＞50%, 45 parts of powders, comprise mixing fine powders and compound organic pore-forming agents, wherein mixing fine powders is 40 parts, the weight portion proportioning of mixing fine powders consists of: 35～65 parts of fused mullites, 15～30 parts of α-alumina powders, 10～15 parts of silicon powders, 10～15 parts of bonding clays, the chemical composition mass percent of α-alumina powder is: α-Al
2O
3Phase＞93%, the chemical composition mass percent of silicon powder is: SiO
2＞99%, the chemical composition mass percent of bonding clay is: Al
2O
333～40%, Fe
2O
3＜1.3%, wherein compound organic pore-forming agents is 5 parts, compound organic pore-forming agents is rice hull ash with anchracite duff by 1～3: 1～2 mass ratio mixes, particle mean size＜0.05mm, 4 parts of macromolecule bonds, the macromolecule bond is the polyvinyl alcohol liquation, and its molecular weight is 25～300,000, and concentration is 1.01-1.02g/cm
3 Heat insulation layer 3 is an alumina fibre cotton, 1000 ℃ of the cotton thermal conductivity factor＜0.03W/mK of alumina fibre, and maximum operation (service) temperature is 1350 ~ 1450 ℃.Described indentations section is trapezoidal, rectangle or other geometries.The preparation method of described mixing fine powders grinds its particle mean size＜0.074mm jointly for the raw material with proportioning composition amount.
The preparation method:
The first step, batching:
Working lining 1: the particulate material that will be not less than 0.074mm was put into kolleroang adding new junction agent mixed grind 5 minutes, it is standby to add behind the residue powder mixed grind 10 minutes then successively, thermal insulation layer 2: the particulate material that will be not less than 0.074mm is put into kolleroang and was added the new junction agent mixed grind 5 minutes, and it is standby to add behind the residue powder mixed grind 10 minutes then successively;
Second goes on foot, and finishes the batching back and with dividing plate mould is divided into length than two parts that are 3:2, with working lining 1 two compartments of pug adding with thermal insulation layer 2, adopts the punch forming of 630T friction press behind the extraction dividing plate respectively;
In the 3rd step, the adobe air dry after 24 hours, was dried 24 hours for 110 ℃;
In the 4th step, burn till:
Formed green brick was taken out by 110 ℃ of oven dry after 24 hours, and loading of kiln is in 1380 ℃～1450 ℃ insulations cooling after 5 hours, and the indentation, there that the alumina fibre cotton is bonded to cooling back goods had both obtained this goods.
Implementation result:
From above-described embodiment 1, embodiment 2 as can be seen the every index of product of the present invention all greater than 1680 common on market siliceous mullite bricks, the lower porosity can improve the corrosion resistance of product, lower body is close to reduce the Thermal Equipment deadweight, Thermal Equipment deadweight alleviate load when having effectively reduced the equipment motor rotation, operation the time electric current, the power consumption of ton product, improved the stability of motor operation simultaneously, reduced maintenance times, for equipment operation steady in a long-term provides guarantee.Lower thermal conductivity factor can also reduce thermal loss, and higher lotus softening temperature and thermal shock resistance have guaranteed security and the long service life that product uses.Be used for replacing existing common 1680 siliceous mullite brick energy conservation and consumption reduction effects remarkable.
The above only is two kinds of specific embodiments of the present invention, but embodiments of the invention are not limited thereto, and any those skilled in the art is in the field of the invention, and the variation of doing or modify all is encompassed within protection scope of the present invention.
Claims (4)
1. one kind low heat conduction MULTILAYER COMPOSITE mullite brick, it is characterized in that: it comprises working lining, thermal insulation layer and heat insulation layer, described working lining links to each other with thermal insulation layer, at thermal insulation layer a breach is arranged, heat insulation layer is positioned at this breach, working lining is by aggregate, it is formulated according to the following weight parts proportioning that powder and antioxidant add new junction agent: 45～60 parts in aggregate, wherein the fused mullite of granularity 0～1mm is 10～15 parts, 15～20 parts of the fused mullites of granularity 1～3mm, 20～25 parts of the fused mullites of granularity 3～5mm, the chemical composition mass percent of fused mullite is: mullite phase 80～90%, Fe
2O
3＜0.8%, K
2O+Na
2O＜0.3%, 37～45 parts of powders, 30～35 parts of the fused mullites of granularity＜0.074mm, 7～10 parts in the carborundum of granularity＜0.074mm, the chemical composition mass percent of carborundum is: SiC＞97%, 3～5 parts of antioxidants, antioxidant be metallic aluminium powder and metallic silicon power by 1～2: 1 weight ratio mixes, its particle mean size＜0.05mm, 4～5 parts of new junction agents, new junction agent is low sodium Ludox, and its chemical composition mass percent is: Na
2O＜0.006%, SiO
2＞30%; Thermal insulation layer is that to add the macromolecule bond by aggregate and powder formulated according to the following weight parts proportioning: 45～70 parts in aggregate, wherein the fused mullite of granularity 0～1mm is 10～15 parts, 20～30 parts of the fused mullites of granularity 1～3mm, 15～25 parts of the high-strength light mullite aggregates of granularity 1～2mm, the chemical composition mass percent of high-strength light mullite aggregate is: mullite phase＞60%, bulk density＜1.3g/cm
3, the porosity＞50%, 35～55 parts of powders, comprise mixing fine powders and compound organic pore-forming agents, wherein mixing fine powders is 30～40 parts, the weight portion proportioning of mixing fine powders consists of: 35～65 parts of fused mullites, 15～30 parts of α-alumina powders, 10～15 parts of silicon powders, 10～15 parts of bonding clays, the chemical composition mass percent of α-alumina powder is: α-Al
2O
3Phase＞93%, the chemical composition mass percent of silicon powder is: SiO
2＞99%, the chemical composition mass percent of bonding clay is: Al
2O
333～40%, Fe
2O
3＜1.3%, wherein compound organic pore-forming agents is 5～15 parts, compound organic pore-forming agents is rice hull ash with anchracite duff by 1～3: 1～2 mass ratio mixes, particle mean size＜0.05mm, 4～5 parts of macromolecule bonds, the macromolecule bond is the polyvinyl alcohol liquation, and its molecular weight is 25～300,000, and concentration is 1.01-1.02g/cm
3Heat insulation layer is an alumina fibre cotton, 1000 ℃ of the cotton thermal conductivity factor＜0.03W/mK of alumina fibre, and maximum operation (service) temperature is 1350 ~ 1450 ℃.
2. a kind of low heat conduction MULTILAYER COMPOSITE mullite brick according to claim 1, it is characterized in that: described indentations section is trapezoidal, rectangle or other geometries.
3. a kind of low heat conduction MULTILAYER COMPOSITE mullite brick according to claim 1 is characterized in that: the preparation method of described mixing fine powders grinds its particle mean size＜0.074mm jointly for the raw material with proportioning composition amount.
4. the preparation method of a kind of low heat conduction MULTILAYER COMPOSITE mullite brick according to claim 1, it is characterized in that: it comprises the steps:
The first step, batching:
Working lining: the particulate material that will be not less than 0.074mm was put into kolleroang adding new junction agent mixed grind 5 minutes, it is standby to add behind the residue powder mixed grind 10 minutes then successively, thermal insulation layer: the particulate material that will be not less than 0.074mm is put into kolleroang and was added the new junction agent mixed grind 5 minutes, and it is standby to add behind the residue powder mixed grind 10 minutes then successively;
Second step, finish the batching back and with dividing plate mould is divided into two parts that the length ratio is 1 ~ 3:1 ~ 2, the pug with working lining and thermal insulation layer adds two compartments respectively, adopts the punch forming of 630T friction press behind the extraction dividing plate;
In the 3rd step, the adobe air dry after 24 hours, was dried 24 hours for 110 ℃;
In the 4th step, burn till:
Formed green brick was taken out by 110 ℃ of oven dry after 24 hours, and loading of kiln is in 1380 ℃～1450 ℃ insulations cooling after 5 hours, and the indentation, there that the alumina fibre cotton is bonded to cooling back goods had both obtained this goods.
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| CN201310172268.9A CN103234346B (en) | 2013-05-10 | 2013-05-10 | Low-heat-conduction multi-layer mullite brick and preparation method thereof |
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