CN103234346B - 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 field of material technology, be specifically related to a kind of low heat conduction MULTILAYER COMPOSITE mullite brick and preparation method thereof.
Background technology
The intermediate zone up and down of new type nonaqueous cement rotary kiln is adjacent with clinkering zone, usually undergos the environment for use harsher than clinkering zone, and be the most scabrous position in whole quality coal in cement kiln systems selection, this portion generally uses siliceous mullite brick for lining brick now.
The siliceous mullite brick that existing market is sold uses one-level or superfine bauxite mostly, indivedual enterprise is also added with electro-corundum to improve product high-temperature behavior and corrosion resistance, but this increases the thermal conductivity factor of siliceous mullite brick simultaneously, increasing of thermal conductivity factor makes thermal loss in cement kiln very fast, ton cement fuel consumption consumption increases, barrel temperature raises, cylindrical shell is easily made to deform, cylindrical shell is caused to shorten service life, the cylindrical shell of distortion makes refractory material bricking unbalance stress in kiln, easily send out fracture and breakage, cause bricking to reduce service life.
Summary of the invention
The object of the invention is to the shortcoming and defect overcoming prior art, a kind of low heat conduction MULTILAYER COMPOSITE mullite brick and preparation method thereof is provided, this low heat conduction MULTILAYER COMPOSITE mullite brick is used for replacing existing siliceous mullite brick, to solve the use problem of the upper and lower intermediate zone bricking of cement kiln.
One of the present invention low heat conduction MULTILAYER COMPOSITE mullite brick 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, and described working lining is connected with thermal insulation layer, and thermal insulation layer has a breach, and heat insulation layer is positioned at this breach, working lining is by aggregate, powder and the additional new junction agent of antioxidant formulated according to following weight parts proportioning: 45 ~ 60 parts, aggregate, the wherein fused mullite 10 ~ 15 parts of granularity 0 ~ 1mm, the fused mullite of granularity 1 ~ 3mm 15 ~ 20 parts, the fused mullite of granularity 3 ~ 5mm 20 ~ 25 parts, the chemical composition mass percent of fused mullite is: mullite phase 80 ~ 90%, Fe
2o
3< 0.8%, K
2o+Na
2o < 0.3%, powder 37 ~ 45 parts, the fused mullite of granularity < 0.074mm 30 ~ 35 parts, 7 ~ 10 parts, the carborundum of granularity < 0.074mm, the chemical composition mass percent of carborundum is: SiC > 97%, antioxidant 3 ~ 5 parts, antioxidant be metallic aluminium powder with metallic silicon power by 1 ~ 2: 1 weight ratio mix, its particle mean size < 0.05mm, new junction agent 4 ~ 5 parts, new junction agent is low sodium Ludox, its chemical composition mass percent is: Na
2o < 0.006%, SiO
2> 30%, thermal insulation layer be by aggregate and powder additional macromolecule bonding agent formulated according to following weight parts proportioning: 45 ~ 70 parts, aggregate, the wherein fused mullite 10 ~ 15 parts of granularity 0 ~ 1mm, the fused mullite of granularity 1 ~ 3mm 20 ~ 30 parts, the high-strength light mullite aggregate of granularity 1 ~ 2mm 15 ~ 25 parts, the chemical composition mass percent of high-strength light mullite aggregate is: mullite phase > 60%, bulk density < 1.3g/cm
3, porosity > 50%, powder 35 ~ 55 parts, comprise mixing fine powders and compound organic pore-forming agents, wherein mixing fine powders 30 ~ 40 parts, the weight of mixing fine powders consists of: fused mullite 35 ~ 65 parts, α-alumina powder 15 ~ 30 parts, silicon powder 10 ~ 15 parts, bonding clay 10 ~ 15 parts, 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 5 ~ 15 parts, compound organic pore-forming agents is that rice hull ash mixes by 1 ~ 3: 1 ~ 2 mass ratioes with anchracite duff, particle mean size < 0.05mm, macromolecule bonding agent 4 ~ 5 parts, macromolecule bonding agent is poly-vinyl alcohol solution, and its molecular weight is 25 ~ 300,000, and concentration is 1.01-1.02g/cm
3, heat insulation layer is one piece of alumina fibre cotton, and alumina fibre cotton thermal conductivity factor < 0.03W/mK, maximum operation (service) temperature is 1350 ~ 1450 DEG C.
As preferably, described indentations section is trapezoidal, rectangle or other geometries.
As preferably, the raw material of proportioning composition amounts grinds by the preparation method of described mixing fine powders jointly, its particle mean size < 0.074mm.
Preparation method:
The first step, batching:
Working lining: the particulate material being not less than 0.074mm is put into kolleroang and add new junction agent mixed grind 5 minutes, then after adding residue powder successively, mixed grind 10 minutes is for subsequent use, thermal insulation layer: the particulate material being not less than 0.074mm is put into kolleroang and add new junction agent mixed grind 5 minutes, after then adding residue powder successively, mixed grind 10 minutes is for subsequent use;
Second step, is divided into mould two parts that length ratio is 1 ~ 3:1 ~ 2 with dividing plate after completing batching, respectively the pug of working lining and thermal insulation layer is added two compartments, adopts the punch forming of 630T friction press after extracting dividing plate;
3rd step, by adobe natural drying after 24 hours, dries 24 hours for 110 DEG C;
4th step, burn till:
After drying 24 hours through 110 DEG C after adobe after shaping being taken out, loading of kiln is in 1380 DEG C ~ 1450 DEG C insulations cooling after 5 hours, and after alumina fibre cotton is bonded to cooling, namely the indentation, there of goods obtains this goods.
The Novel mullite brick adopting our company's invention is working lining, and this product thermal conductivity ratio like product is low, and intensity is high, relies on the high-temperature behavior that mullite is excellent mutually, significantly can improve thermal shock resistance and the corrosion resistance of product.The novel light mullite brick adopting our company's invention is thermal insulation layer, this product cold crushing strength and maximum operation (service) temperature index and cement kiln anti-peeling high aluminium brick close, and body is close and thermal conductivity factor and light weeight alumina brick close, greatly can improve effect of heat insulation, energy conservation and consumption reduction effects is remarkable.Heat insulation layer manually manufactures a breach at thermal insulation layer, places and have low heat conductivity and compared with the cotton module of the alumina fibre of operation at high temperature, reduce further 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, there is excellent applied at elevated temperature performance, its thermal conductivity factor is far below like product simultaneously, drum surface temperature can be greatly reduced when being used in intermediate zone and kiln tail before and after cement kiln after tested, low relative to like product on market 2 ~ 3 times.
Accompanying drawing explanation
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.
Detailed description of the invention
Embodiment 1:
As shown in Figure 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, and described working lining 1 is connected with thermal insulation layer 2, and thermal insulation layer 2 has a breach, and heat insulation layer 3 is positioned at this breach; Working lining 1 is by aggregate, powder and the additional new junction agent of antioxidant formulated according to following weight parts proportioning: 55 parts, aggregate, the wherein fused mullite 10 parts of granularity 0 ~ 1mm, the fused mullite of granularity 1 ~ 3mm 20 parts, the fused mullite of granularity 3 ~ 5mm 25 parts, the chemical composition mass percent of fused mullite is: mullite phase 80 ~ 90%, Fe
2o
3< 0.8%, K
2o+Na
2o < 0.3%, powder 42 parts, the fused mullite of granularity < 0.074mm 32 parts, 10 parts, the carborundum of granularity < 0.074mm, the chemical composition mass percent of carborundum is: SiC > 97%, antioxidant 3 parts, antioxidant be metallic aluminium powder with metallic silicon power by 1 ~ 2: 1 weight ratio mix, its particle mean size < 0.05mm, new junction agent 4 parts, 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 be by aggregate and powder additional macromolecule bonding agent formulated according to following weight parts proportioning: 55 parts, aggregate, the wherein fused mullite 10 parts of granularity 0 ~ 1mm, the fused mullite of granularity 1 ~ 3mm 25 parts, the high-strength light mullite aggregate of granularity 1 ~ 2mm 20 parts, the chemical composition mass percent of high-strength light mullite aggregate is: mullite phase > 60%, bulk density < 1.3g/cm
3, porosity > 50%, powder 45 parts, comprise mixing fine powders and compound organic pore-forming agents, wherein mixing fine powders 40 parts, the weight of mixing fine powders consists of: fused mullite 35 ~ 65 parts, α-alumina powder 15 ~ 30 parts, silicon powder 10 ~ 15 parts, bonding clay 10 ~ 15 parts, 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 5 parts, compound organic pore-forming agents is that rice hull ash mixes by 1 ~ 3: 1 ~ 2 mass ratioes with anchracite duff, particle mean size < 0.05mm, macromolecule bonding agent 4 parts, macromolecule bonding agent is poly-vinyl alcohol solution, and its molecular weight is 25 ~ 300,000, and concentration is 1.01-1.02g/cm
3; Heat insulation layer 3 is one piece of alumina fibre cotton, and alumina fibre cotton thermal conductivity factor < 0.03W/mK, maximum operation (service) temperature is 1350 ~ 1450 DEG C.Described indentations section is trapezoidal, rectangle or other geometries.The raw material of proportioning composition amounts grinds by the preparation method of described mixing fine powders jointly, its particle mean size < 0.074mm.
Preparation method:
The first step, batching:
Working lining 1: the particulate material being not less than 0.074mm is put into kolleroang and add new junction agent mixed grind 5 minutes, then after adding residue powder successively, mixed grind 10 minutes is for subsequent use, thermal insulation layer 2: the particulate material being not less than 0.074mm is put into kolleroang and add new junction agent mixed grind 5 minutes, after then adding residue powder successively, mixed grind 10 minutes is for subsequent use;
Second step, is divided into length than two parts being 7:3 with dividing plate by mould after completing batching, respectively working lining 1 and the pug of thermal insulation layer 2 is added two compartments, adopts the punch forming of 630T friction press after extracting dividing plate;
3rd step, by adobe natural drying after 24 hours, dries 24 hours for 110 DEG C;
4th step, burn till:
After drying 24 hours through 110 DEG C after adobe after shaping being taken out, loading of kiln is in 1380 DEG C ~ 1450 DEG C insulations cooling after 5 hours, and after alumina fibre cotton is bonded to cooling, namely the indentation, there of goods obtains this goods.
Implementation result:
Embodiment 2:
As shown in Figure 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, and described working lining 1 is connected with thermal insulation layer 2, and thermal insulation layer 2 has a breach, and heat insulation layer 3 is positioned at this breach; Working lining 1 is by aggregate, powder and the additional new junction agent of antioxidant formulated according to following weight parts proportioning: 55 parts, aggregate, the wherein fused mullite 15 parts of granularity 0 ~ 1mm, the fused mullite of granularity 1 ~ 3mm 20 parts, the fused mullite of granularity 3 ~ 5mm 20 parts, the chemical composition mass percent of fused mullite is: mullite phase 80 ~ 90%, Fe
2o
3< 0.8%, K
2o+Na
2o < 0.3%, powder 40 parts, the fused mullite of granularity < 0.074mm 33 parts, 7 parts, the carborundum of granularity < 0.074mm, the chemical composition mass percent of carborundum is: SiC > 97%, antioxidant 5 parts, antioxidant be metallic aluminium powder with metallic silicon power by 1 ~ 2: 1 weight ratio mix, its particle mean size < 0.05mm, new junction agent 5 parts, 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 be by aggregate and powder additional macromolecule bonding agent formulated according to following weight parts proportioning: 55 parts, aggregate, the wherein fused mullite 10 parts of granularity 0 ~ 1mm, the fused mullite of granularity 1 ~ 3mm 25 parts, the high-strength light mullite aggregate of granularity 1 ~ 2mm 20 parts, the chemical composition mass percent of high-strength light mullite aggregate is: mullite phase > 60%, bulk density < 1.3g/cm
3, porosity > 50%, powder 45 parts, comprise mixing fine powders and compound organic pore-forming agents, wherein mixing fine powders 40 parts, the weight of mixing fine powders consists of: fused mullite 35 ~ 65 parts, α-alumina powder 15 ~ 30 parts, silicon powder 10 ~ 15 parts, bonding clay 10 ~ 15 parts, 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 5 parts, compound organic pore-forming agents is that rice hull ash mixes by 1 ~ 3: 1 ~ 2 mass ratioes with anchracite duff, particle mean size < 0.05mm, macromolecule bonding agent 4 parts, macromolecule bonding agent is poly-vinyl alcohol solution, and its molecular weight is 25 ~ 300,000, and concentration is 1.01-1.02g/cm
3; Heat insulation layer 3 is one piece of alumina fibre cotton, and alumina fibre cotton thermal conductivity factor < 0.03W/mK, maximum operation (service) temperature is 1350 ~ 1450 DEG C.Described indentations section is trapezoidal, rectangle or other geometries.The raw material of proportioning composition amounts grinds by the preparation method of described mixing fine powders jointly, its particle mean size < 0.074mm.
Preparation method:
The first step, batching:
Working lining 1: the particulate material being not less than 0.074mm is put into kolleroang and add new junction agent mixed grind 5 minutes, then after adding residue powder successively, mixed grind 10 minutes is for subsequent use, thermal insulation layer 2: the particulate material being not less than 0.074mm is put into kolleroang and add new junction agent mixed grind 5 minutes, after then adding residue powder successively, mixed grind 10 minutes is for subsequent use;
Second step, is divided into length than two parts being 3:2 with dividing plate by mould after completing batching, respectively working lining 1 and the pug of thermal insulation layer 2 is added two compartments, adopts the punch forming of 630T friction press after extracting dividing plate;
3rd step, by adobe natural drying after 24 hours, dries 24 hours for 110 DEG C;
4th step, burn till:
After drying 24 hours through 110 DEG C after adobe after shaping being taken out, loading of kiln is in 1380 DEG C ~ 1450 DEG C insulations cooling after 5 hours, and after alumina fibre cotton is bonded to cooling, namely the indentation, there of goods obtains this goods.
Implementation result:
Can find out that product indices of the present invention is all greater than 1680 siliceous mullite bricks common market from above-described embodiment 1, embodiment 2, the lower porosity can improve the corrosion resistance of product, lower body is close can reduce Thermal Equipment deadweight, Thermal Equipment deadweight alleviate load when effectively reducing equipment motor rotation, the power consumption of electric current when running, ton product, improve the stability that motor runs simultaneously, decrease maintenance times, run for equipment long-term stability and provide guarantee.Lower thermal conductivity factor can also reduce thermal loss, and higher lotus softening temperature and thermal shock resistance ensure that the security that product uses and longer service life.Be used for replacing existing common 1680 siliceous mullite brick energy conservation and consumption reduction effects remarkable.
The foregoing is only two kinds of specific embodiments of the present invention, but embodiments of the invention are not limited thereto, any those skilled in the art is in the field of the invention, and the change done or modification are all 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 is connected with thermal insulation layer, thermal insulation layer has a breach, heat insulation layer is positioned at this breach, working lining is by aggregate, powder and the additional new junction agent of antioxidant formulated according to following weight parts proportioning: 45 ~ 60 parts, aggregate, the wherein fused mullite 10 ~ 15 parts of granularity 0 ~ 1mm, the fused mullite of granularity 1 ~ 3mm 15 ~ 20 parts, the fused mullite of granularity 3 ~ 5mm 20 ~ 25 parts, the chemical composition mass percent of fused mullite is: mullite phase 80 ~ 90%, Fe
2o
3< 0.8%, K
2o+Na
2o < 0.3%, powder 37 ~ 45 parts, the fused mullite of granularity < 0.074mm 30 ~ 35 parts, 7 ~ 10 parts, the carborundum of granularity < 0.074mm, the chemical composition mass percent of carborundum is: SiC > 97%, antioxidant 3 ~ 5 parts, antioxidant be metallic aluminium powder with metallic silicon power by 1 ~ 2: 1 weight ratio mix, its particle mean size < 0.05mm, new junction agent 4 ~ 5 parts, new junction agent is low sodium Ludox, its chemical composition mass percent is: Na
2o < 0.006%, SiO
2> 30%, thermal insulation layer be by aggregate and powder additional macromolecule bonding agent formulated according to following weight parts proportioning: 45 ~ 70 parts, aggregate, the wherein fused mullite 10 ~ 15 parts of granularity 0 ~ 1mm, the fused mullite of granularity 1 ~ 3mm 20 ~ 30 parts, the high-strength light mullite aggregate of granularity 1 ~ 2mm 15 ~ 25 parts, the chemical composition mass percent of high-strength light mullite aggregate is: mullite phase > 60%, bulk density < 1.3g/cm
3, porosity > 50%, powder 35 ~ 55 parts, comprise mixing fine powders and compound organic pore-forming agents, wherein mixing fine powders 30 ~ 40 parts, the weight of mixing fine powders consists of: fused mullite 35 ~ 65 parts, α-alumina powder 15 ~ 30 parts, silicon powder 10 ~ 15 parts, bonding clay 10 ~ 15 parts, 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 5 ~ 15 parts, compound organic pore-forming agents is that rice hull ash mixes by 1 ~ 3: 1 ~ 2 mass ratioes with anchracite duff, particle mean size < 0.05mm, macromolecule bonding agent 4 ~ 5 parts, macromolecule bonding agent is poly-vinyl alcohol solution, and its molecular weight is 25 ~ 300,000, and concentration is 1.01-1.02g/cm
3, heat insulation layer is one piece of alumina fibre cotton, and alumina fibre cotton thermal conductivity factor < 0.03W/mK, maximum operation (service) temperature is 1350 ~ 1450 DEG C.
2. one according to claim 1 low heat conduction MULTILAYER COMPOSITE mullite brick, is characterized in that: described indentations section is trapezoidal, rectangle or other geometries.
3. one according to claim 1 low heat conduction MULTILAYER COMPOSITE mullite brick, is characterized in that: the raw material of proportioning composition amounts grinds by the preparation method of described mixing fine powders jointly, its particle mean size < 0.074mm.
4. the preparation method of a kind of low heat conduction MULTILAYER COMPOSITE mullite brick according to claim 1, is characterized in that: it comprises the steps:
The first step, batching:
Working lining: the particulate material being not less than 0.074mm is put into kolleroang and add new junction agent mixed grind 5 minutes, then after adding residue powder successively, mixed grind 10 minutes is for subsequent use, thermal insulation layer: the particulate material being not less than 0.074mm is put into kolleroang and add new junction agent mixed grind 5 minutes, after then adding residue powder successively, mixed grind 10 minutes is for subsequent use;
Second step, is divided into mould two parts that length ratio is 1 ~ 3:1 ~ 2 with dividing plate after completing batching, respectively the pug of working lining and thermal insulation layer is added two compartments, adopts the punch forming of 630T friction press after extracting dividing plate;
3rd step, by adobe natural drying after 24 hours, dries 24 hours for 110 DEG C;
4th step, burn till:
After drying 24 hours through 110 DEG C after adobe after shaping being taken out, loading of kiln is in 1380 DEG C ~ 1450 DEG C insulations cooling after 5 hours, and after alumina fibre cotton is bonded to cooling, namely the indentation, there of goods obtains 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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| CN201852457U (en) * | 2010-09-09 | 2011-06-01 | 郑州汇特耐火材料有限公司 | Embedded type silicon mullite brick for cement kiln |
| CN102285813B (en) * | 2011-06-06 | 2013-05-08 | 浙江大学 | Zirconium-corundum-mullite structure and thermal insulation integrated composite brick and preparation method thereof |
| CN102887713B (en) * | 2011-07-20 | 2016-05-11 | 郑州汇特耐火材料有限公司 | A kind of low heat conductivity siliceous mullite brick and preparation method thereof |
| CN102898167B (en) * | 2012-11-09 | 2014-08-13 | 郑州瑞泰耐火科技有限公司 | Fire-resistant pouring material used for bottom of lead smelting furnace |
| CN103058685A (en) * | 2013-01-25 | 2013-04-24 | 苏州罗卡节能科技有限公司 | Medium-density silicon mullite brick used for rotary kiln and preparation method thereof |
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