CN101734937A - Lightweight spinel refractory bricks and preparation method thereof - Google Patents
Lightweight spinel refractory bricks and preparation method thereof Download PDFInfo
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- CN101734937A CN101734937A CN200910243007A CN200910243007A CN101734937A CN 101734937 A CN101734937 A CN 101734937A CN 200910243007 A CN200910243007 A CN 200910243007A CN 200910243007 A CN200910243007 A CN 200910243007A CN 101734937 A CN101734937 A CN 101734937A
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Abstract
The invention relates to a lightweight spinel heat insulation and heat preservation refractory material used for an industrial furnace, belonging to the technical field of refractory materials. The refractory bricks are characterized by light weight, low heat conductivity coefficient, high strength and good heat insulating and heat preservation effects. In the invention, magnesite and manufactured alumina and the like are taken as raw materials, and the lightweight spinel heat insulating and heat preservation refractory materials with low heat conductivity coefficient, high strength and good heat insulating and heat preservation effects are prepared through the process procedures of component design and regulating, the adding of organic/inorganic composite pore-forming agent, medium-dry vibration casting molding, humidifying and controllable drying, high-temperature entraining and pore-forming, the sintering by reduction reaction in one step, cutting processing and the like. The main phase of the heat insulating and heat preservation refractory materials in the invention is spinel phase with the main chemical component being MgO+Al2O3. The heat insulating and heat preservation refractory material is a refractory brick used for high temperature furnace lining, which can substitute the currently used alumina hollow balls to be served as the refractory material furnace lining for various industrial furnaces.
Description
Technical field:
The present invention relates to a kind of lightweight spinel refractory bricks of industrial kiln and preparation method thereof, belong to fire resisting material field.
Background technology:
Industrial Stoves are the main energy consumption equipments in the industrial production, annual energy consumption enormous amount, and especially in the hot procedure in metallurgy, building materials, pottery, glass, chemical industry and dynamo-electric enterprise, the energy consumption of Industrial Stoves can account for the 40-70% of total energy consumption.Yet the thermosteresis of various Industrial Stoves is generally all very big, and in most of the cases, their thermo-efficiency is all lower, and energy utilization rate is about 30%.Therefore, press for the fine heat insulating refractory materials,, reach the purpose of energy-saving and emission-reduction with heat lost by radiation and the accumulation of heat loss that reduces big energy.
The lagging material that is applied to various inner lining of kiln at present mainly contains refractory fibre, Al
2O
3-SiO
2Be lightweight refractory and alumina bubble brick etc., wherein refractory fibre and Al
2O
3-SiO
2Be cryogenic Industrial Stoves environment during lightweight refractory is mainly used in, and a large amount of in the high temperature kiln more than 1600 ℃ what use is alumina bubble brick.
The process for making of alumina bubble brick need experience energy consumption process three times, and for the first time energy consumption is to utilize the bauxitic clay mineral to prepare required energy consumption in the process of aluminum oxide; For the second time energy consumption is to blow and make the required energy consumption of alumina hollow ball with commercial alumina melting in electric furnace; Energy consumption is the required energy consumption of alumina bubble brick goods sintering process for the third time.These three energy consumption process have caused a large amount of energy consumptions, and the price of aluminum oxide and alumina hollow ball is higher, and the production cost that makes alumina bubble brick is than higher.In addition, the density of alumina bubble brick is bigger, generally at 1.5g/cm
3About, its heat storage capacity is stronger, and rate of heat transfer is very fast simultaneously, and heat lost by radiation is bigger, makes it in the thermal losses that use has increased kiln, has caused a large amount of heat wastes, has increased energy consumption.Therefore, prepare a kind of less energy-consumption and cheaply lightening fire resistant heat-insulation and heat-preservation material just seem very urgent.
Magnesium-aluminium spinel (MgAl
2O
4) have the fusing point height, series of advantages such as thermal expansivity is low, and the slag corrosion resistance ability is strong, and can synthetic.With magnesite and aluminum oxide is raw material synthetic MgAl spinal light weight quality high-temperature material, have characteristics such as density is little, thermal conductivity is low, thermal shock resistance is good, can satisfy in 1000 ℃～1800 ℃ hot environments especially the service requirements greater than 1500 ℃ high temperature kiln, be a kind of ideal heat insulating refractory materials.It can substitute the furnace lining that the lightweight alumina bubble brick is done multiple high temperature kiln and high-temperature electric resistance furnace, because the density of magnesium-aluminium spinel light weight quality high-temperature material ratio aluminum oxide hollow ball brick is little, cost is low, the advantage of production process less energy consumption, can reduce the energy waste of production process and use significantly.
Existing patent and bibliographical information analysis introduction about the porous light spinel refractory bricks is as follows:
1, the technology of " a kind of ceramic material of porous spinel and preparation method thereof (CN200610019551.8) ", it uses magnesite breeze and Al (OH)
3Powder, its manufacturing process that adopts is that machine is pressed or ramming, in the proportioning process process, do not adopt as yet to add to burn and lose the volume density that agent boring technique method reduces adobe, firing temperature is 1600 ℃～1800 ℃, and firing temperature is higher, and prepared porous spinelle stupalith density is bigger, it is bigger to consume energy, and is unfavorable for preparing the low spinel heat insulation refractory bricks of the less thermal conductivity of density.
2, " a kind of magnesium-aluminium light thermal insulation fire-resistant material and preparation method thereof " technology (CN200410013257.7), the light heat insulation material that is generated belongs to alkaline lightweight refractory, but it uses raw material to be magnesite breeze, light-magnesite powder, alumine powder, Al (OH)
3Powder, can burn the lost article powder, firing temperature is 1300 ℃～1500 ℃, and the goods foreign matter content is higher relatively, and firing temperature is lower, and density is bigger, and the use temperature of goods is low, and it is bigger to cause goods in use to consume energy, and is unfavorable for the energy-saving heat-insulating insulation of kiln.
3, one piece of paper that is entitled as " preparation of gel casting forming corundum-spinel porous ceramics " of delivering at " Beijing Institute of Technology's journal " magazine 2005 (11) is arranged, the author is Liu Zuo ability and Chen Ying.Paper has been introduced and has been adopted the gel casting forming legal system to be equipped with the process of corundum-spinel porous ceramics, having described with plate diamond spar and aluminium riched spinel is main raw material, add organic monomer, linking agent, catalyzer, initiator etc., and the performance of the porous corundum-spinel material of preparation.The raw material that this selected theses is used is to adopt synthetic spinel in advance, and the technological process step is many, preparation process energy consumption height, and the density of material of making is bigger, and the use power consumption is also bigger, is unfavorable for the energy-saving and cost-reducing of Industrial Stoves.
4, one piece of paper that is entitled as " adding the influence of light calcined magnesia to magnesium-aluminium spinel lightweight refractory sintering character " of delivering at " material and metallurgical journal " magazine 2004 (2) is arranged, the author is a Sun Li maple and female in scape.It is raw material that paper has been described with commercial alumina, heavy burned magnesium oxide, light calcined magnesia, pore former and wedding agent, preparation lightweight magnesium-aluminum spinel material.Inquired into and added the influence of light calcined magnesia magnesium-aluminium spinel lightweight refractory sintering character.The magnesium source that this selected theses is used is heavily to burn and light calcined magnesia, and cost is higher relatively, and the technological process step is many, and preparation process energy consumption height is unfavorable for the energy-conservation of preparation process.
So, in general, it is very urgent to invent the lightweight spinel refractory bricks of developing a kind of low thermal conductivity high strength and having the outstanding little advantage of density, it is applied to reduce discharging China's high temperature kiln industry energy-saving producing enormous function, has great importance.
Summary of the invention:
The present invention seeks to have outstanding problems such as cost height, energy consumption be huge with alumina bubble brick at present inner lining of kiln, utilize advantages such as the magnesium-aluminium spinel resistance to elevated temperatures is good, thermal expansivity is low, a kind of lightweight spinel heat insulation refractory bricks and preparation method thereof is proposed, reach the purpose of energy-efficient, the long-life hot industry inner lining of kiln of preparation, thereby contribute for the energy-saving and emission-reduction of hot industry with light fire brick.
For achieving the above object, technical scheme of the present invention is as follows:
The present invention is a kind of lightweight spinel refractory bricks, it is characterized in that: this lightweight spinel refractory bricks is mainly used in the heat insulating refractory materials of Industrial Stoves, and the main thing of this refractory brick is the spinel phase mutually; Volume density≤the 1.26g/cm of this refractory brick
3
The add-on and the specification of quality of each raw material are as follows when preparing burden in the preparation process of the present invention: require MgCO in the magnesite
3〉=98.0%, 0.1mm～0.3mm requires γ-Al in the commercial alumina
2O
3〉=96.0%, 0.1mm～0.3mm.The mass ratio of magnesite and commercial alumina is between 0.84～1.42 in the batching, MgCO in the batching
3+ γ-Al
2O
3〉=95.0% (mass percent example).
A kind of lightweight spinel refractory bricks that the present invention proposes and preparation method thereof, it is characterized in that: its preparation method is: at first magnesite and commercial alumina are prepared burden by a certain percentage, mix, be milled down to 0.1mm～0.3mm then together; The mixed powder that will take out from grinding machine adds and accounts for 0.1～17.0% of total batching and burn to lose pore-forming material and (burn and lose pore-forming material and can be chosen as wherein one or more of wood chip sawdust or other plant powder or polystyrene spheres or coke powder or coal powder or activated carbon etc. and can lose pore-forming material as burning burning the material that loses greater than 1000 ℃, its particle diameter≤5.0mm) mix together, add 11～40% drinkable water after mixing again and stir, the pug that obtains adopts vibrating casting manufacturing process be shaped (also available mud extruder extrusion molding or castable).Wet base after the shaping is seasoning 3～48h at room temperature, dries 0.5～48h in 115～300 ℃ then in dry kiln.The adobe that drying is good is packed into and is burnt till in the kiln, 1380～1590 ℃ of final firing temperatures, to burn till the cooled adobe of kiln discharge on request size cut, promptly obtain lightweight spinel refractory bricks of the present invention, this is a kind of good heat insulation refractory bricks of the high heat insulation and preservation effect of thermal conductivity low strength that has.The correlated performance of this lightweight spinel refractory bricks reaches: volume density≤1.26g/cm
3, 400 ℃ of thermal conductivity≤0.70w/mk, folding strength 〉=2.0MPa.
Embodiment
Below in conjunction with embodiment technical scheme of the present invention is described further:
Raw material of the present invention and prescription are: require MgCO in the magnesite
3〉=98.0%, 0.1mm～0.3mm; Require γ-Al in the commercial alumina
2O
3〉=96.0%, 0.1mm～0.3mm, also available α-Al
2O
3Replace, add-on and specification of quality are constant.The mass ratio of magnesite and commercial alumina is between 0.84～1.42 in the batching, MgCO in the batching
3+ γ-Al
2O
3〉=95.0% (mass percent example).
A kind of porous light heat insulating refractory materials that the present invention proposes and preparation method thereof, it is characterized in that: its preparation method is: at first magnesite and commercial alumina are prepared burden by a certain percentage, mix, be milled down to 0.1mm～0.3mm then together; The mixed powder that will take out from grinding machine adds and accounts for 0.1～17.0% of total batching and burn to lose pore-forming material and (burn and lose pore-forming material and can be chosen as wherein one or more of wood chip sawdust or other plant powder or polystyrene spheres or coke powder or coal powder or activated carbon etc. and can lose pore-forming material as burning burning the material that loses greater than 1000 ℃, its particle diameter≤5.0mm) mix together, add 11～40% drinkable water after mixing again and stir, the pug that obtains adopts vibrating casting manufacturing process be shaped (also available mud extruder extrusion molding or castable).Wet base after the shaping is seasoning 3～48h at room temperature, dries 0.5～48h in 115～300 ℃ then in dry kiln.The adobe that drying is good is packed into and is burnt till in the kiln, 1380～1590 ℃ of final firing temperatures, to burn till the cooled adobe of kiln discharge on request size cut, promptly obtain lightweight spinel refractory bricks of the present invention, this is a kind of good heat insulation refractory bricks of the high heat insulation and preservation effect of thermal conductivity low strength that has.
A kind of preparation technology's flow process of lightweight spinel refractory bricks is:
Raw material → batching → dry ball milling mixes → adds pore-forming material → add water stirring → vibrating casting and is shaped or extruded into shape → brick bat drying → adobe and burns till → adobe cutting processing → check → refractory brick finished product
Embodiment 1
Raw material and proportioning:
The magnesite add-on is 45wt.%, requires MgCO
3〉=98.0%, 0.1mm～0.3mm; Commercial alumina add-on 55wt.% requires γ-Al
2O
3Content is greater than 96wt.%, 0.1mm～0.3mm;
Batching, levigate:
At first various raw materials being packed into according to above-mentioned ratio is milled down to 0.1mm～0.3mm in the grinding machine, and the screen over-size of 0.3mm aperture sieve is less than 2.0wt.%.
Add pore-forming material and stir shaping:
Add 3.0% polystyrene spheres account for total batching and (require its particle diameter≤3.0mm) as pore-forming material, the compound that ball milling is good mixed 10 minutes with pore-forming material, add 10% drinkable water again and stirred the pug that obtains pressurization and vibration castable 5 minutes.
Dry:
Wet base after the shaping is seasoning 12h at room temperature, then in dry kiln prior to 115 ℃ of dry 4h, in 200 ℃ of oven dry 8h, make water ratio≤3.0% of green compact again.
Burn till:
The adobe that drying is good is packed into and is burnt till in the kiln, 1530 ℃ of final firing temperatures.Calcining system is 700 ℃ of insulation 3h, 1530 ℃ of insulation 6h.
Processing, check:
With the adobe after burning till on request size cut and promptly obtain corresponding lightweight spinel heat insulation refractory bricks.
The principal crystalline phase of lightweight spinel heat insulation refractory bricks is the spinel phase behind the sintering, has the little constitutional features of density.
The main performance index of resulting product is as follows:
Suitable use temperature: 1500 ℃; Volume density: 0.78g/cm
3Void content: 53%; Strength at normal temperature 1.2MPa; Cold crushing strength: 1.5MPa; 400 ℃ of thermal conductivitys are 0.56w/mk.
Embodiment 2
Raw material and proportioning:
The magnesite add-on is 45wt.%, requires MgCO
3〉=98.0%, 0.1mm～0.3mm; α-Al
2O
3Add-on 55wt.% requires α-Al
2O
3Content is greater than 98wt.%, 0.1mm～0.3mm;
Batching, ball milling:
At first with various raw materials according to the above-mentioned ratio ball mill ball milling 12h that packs into, raw material is milled down to less than 0.1mm～0.3mm, the screen over-size of 0.3mm aperture sieve is less than 2.0wt.%.
Add pore-forming material and stir shaping:
Add the pore-forming material account for total batching quality 8.0% (2.0% polystyrene spheres and 6.0% wood chip sawdust, require its particle diameter≤3.0mm), the compound that ball milling is good mixed 10 minutes with pore-forming material, add 25% drinkable water again and stirred 8 minutes, the pug that obtains is shaped with vibrating casting and obtains base substrate.
Dry:
Wet base after the shaping is seasoning 30h at room temperature, then in dry kiln prior to 130 ℃ of dry 4h, in 220 ℃ of oven dry 8h, make water ratio≤2.0% of green compact again.
Burn till:
The adobe that drying is good is packed into and is burnt till in the kiln, 1560 ℃ of final firing temperatures.Calcining system is 700 ℃ of insulation 3h, 1560 ℃ of insulation 5h.
Processing, check:
With the adobe after burning till on request size cut and promptly obtain corresponding lightweight spinel heat insulation refractory bricks.
The principal crystalline phase of lightweight spinel heat insulation refractory bricks is the spinel phase behind the sintering, has the feature that density is little, intensity is high, thermal conductivity is low.
The main performance index of resulting product is as follows:
Suitable use temperature: 1600 ℃; Volume density: 1.11g/cm
3Void content: 51%; Strength at normal temperature is greater than 2.4MPa; 400 ℃ of thermal conductivitys are 0.67w/mk.
Embodiment 3
Raw material and proportioning:
The magnesite add-on is 48wt.%, requires MgCO
3〉=98.0%, 0.1mm～0.3mm; Commercial alumina add-on 52wt.% requires γ-Al
2O
3Content is greater than 96wt.%, 0.1mm～0.3mm;
Batching, ball milling:
At first with various raw materials according to the above-mentioned ratio ball mill ball milling 12h that packs into, raw material is milled down to 0.1mm～0.3mm, the screen over-size of 0.3mm aperture sieve is less than 2.0wt.%.
Add pore-forming material and stir shaping:
The wood chip sawdust that adds 2.2% the polystyrene spheres account for total batching, 1.0% coke powder and 4.0% (requires its particle diameter≤3.0mm) as pore-forming material, compound was mixed 15 minutes with pore-forming material, add 28% drinkable water again and stirred 15 minutes, the pug that obtains is shaped with vibrating casting and obtains base substrate.
Dry:
Wet base after the shaping is seasoning 12h at room temperature, then in dry kiln prior to 150 ℃ of dry 24h, in 220 ℃ of oven dry 8h, make water ratio≤3.0% of green compact again.
Burn till:
The adobe that drying is good is packed into and is burnt till in the kiln, 1590 ℃ of final firing temperatures.Calcining system is 650 ℃ of insulation 3h, 1590 ℃ of insulation 5h.
Processing, check:
With the adobe after burning till on request size cut and promptly obtain corresponding lightweight spinel heat insulation refractory bricks.
The principal crystalline phase of lightweight spinel heat insulation refractory bricks is the spinel phase behind the sintering, has the feature that density is little, intensity is high, thermal conductivity is low.
The main performance index of resulting product is as follows:
Suitable use temperature: 1700 ℃; Volume density: 1.20g/cm
3Void content: 45%; Strength at normal temperature 3.7MPa; 400 ℃ of thermal conductivitys are 0.81w/mk.
Claims (3)
1. the present invention is a kind of lightweight spinel refractory bricks, it is characterized in that: this lightweight spinel refractory bricks is mainly used in the heat insulating refractory materials of Industrial Stoves, and the main thing of this light fire brick is the spinel phase mutually; Volume density≤the 1.26g/cm of this light fire brick
3
2. lightweight spinel refractory bricks as claimed in claim 1, its preparation method is: at first magnesite and commercial alumina are prepared burden by a certain percentage, mix, be milled down to 0.1mm～0.3mm then together; The mixed powder that will take out from grinding machine adds 0.1～17.0% burning that accounts for total batching again and loses pore-forming material, burn to lose pore-forming material and can be chosen as wherein one or more of wood chip sawdust or other plant powder or polystyrene spheres or coke powder or coal powder or activated carbon, its particle diameter≤5.0mm.Mix together, add 11～40% drinkable water stirring after mixing again, the pug that obtains adopts the vibrating casting manufacturing process to be shaped also available mud extruder extrusion molding.Wet base after the shaping is seasoning 3～48h at room temperature, dries 0.5～48h in 115～300 ℃ then in dry kiln.The adobe that drying is good is packed into and is burnt till in the kiln, 1380～1590 ℃ of final firing temperatures, to burn till the cooled adobe of kiln discharge on request size cut, promptly obtain lightweight spinel refractory bricks of the present invention, this is a kind of good heat insulation refractory bricks of the high heat insulation and preservation effect of thermal conductivity low strength that has.
3. magnesite as claimed in claim 2 and commercial alumina is characterized in that: require MgCO in the magnesite
3〉=98.0%, 0.1mm～0.3mm requires γ-Al in the commercial alumina
2O
3〉=96.0%, 0.1mm～0.3mm.The mass ratio of commercial alumina and magnesite is between 0.84～1.42 in the batching, MgCO in the batching
3+ γ-Al
2O
3〉=95.0% (mass percent example).
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|---|---|---|---|
| CN200910243007A CN101734937A (en) | 2009-12-23 | 2009-12-23 | Lightweight spinel refractory bricks and preparation method thereof |
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|---|---|---|---|
| CN200910243007A CN101734937A (en) | 2009-12-23 | 2009-12-23 | Lightweight spinel refractory bricks and preparation method thereof |
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Family
ID=42459035
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|---|---|---|---|---|
| CN101928153A (en) * | 2010-09-01 | 2010-12-29 | 中国地质大学（北京） | Calcium hexaluminate and corundum composite porous light heat insulation refractory material and preparation method thereof |
| CN102310192A (en) * | 2011-10-08 | 2012-01-11 | 维苏威高级陶瓷(苏州)有限公司 | Novel combined type brick cup |
| CN104478474A (en) * | 2014-12-23 | 2015-04-01 | 山东鲁阳股份有限公司 | Light refractory brick and preparation method thereof |
| CN104591747A (en) * | 2013-11-01 | 2015-05-06 | 大石桥市中建镁砖有限公司 | Cement kiln heat-insulation composite brick with heat insulation end of lightweight spinel material |
| CN106396728A (en) * | 2016-09-08 | 2017-02-15 | 河南容安热工新材料有限公司 | Wet-process sintering production method for microporous spinel |
| CN106631119A (en) * | 2016-12-28 | 2017-05-10 | 河南和成无机新材料股份有限公司 | High-strength lightweight microporous spinel and preparation method thereof and high temperature resistant brick |
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| CN112266241A (en) * | 2020-11-03 | 2021-01-26 | 江苏省陶瓷研究所有限公司 | Magnesium aluminate spinel porous ceramic and preparation method thereof |
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| CN116239396A (en) * | 2023-05-10 | 2023-06-09 | 东台市圣德尔耐热材料有限公司 | Preparation process of light refractory brick for kiln |
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| CN101928153A (en) * | 2010-09-01 | 2010-12-29 | 中国地质大学（北京） | Calcium hexaluminate and corundum composite porous light heat insulation refractory material and preparation method thereof |
| CN102310192A (en) * | 2011-10-08 | 2012-01-11 | 维苏威高级陶瓷(苏州)有限公司 | Novel combined type brick cup |
| CN104591747A (en) * | 2013-11-01 | 2015-05-06 | 大石桥市中建镁砖有限公司 | Cement kiln heat-insulation composite brick with heat insulation end of lightweight spinel material |
| CN104478474A (en) * | 2014-12-23 | 2015-04-01 | 山东鲁阳股份有限公司 | Light refractory brick and preparation method thereof |
| CN104478474B (en) * | 2014-12-23 | 2017-09-22 | 山东鲁阳股份有限公司 | A kind of light fire brick and preparation method thereof |
| CN106396728A (en) * | 2016-09-08 | 2017-02-15 | 河南容安热工新材料有限公司 | Wet-process sintering production method for microporous spinel |
| CN106631119A (en) * | 2016-12-28 | 2017-05-10 | 河南和成无机新材料股份有限公司 | High-strength lightweight microporous spinel and preparation method thereof and high temperature resistant brick |
| CN108395227A (en) * | 2018-04-26 | 2018-08-14 | 上海宝明耐火材料有限公司 | A kind of lightweight refractory material and preparation method thereof |
| CN110282987A (en) * | 2019-07-03 | 2019-09-27 | 辽宁科技大学 | The manufacturing method of vanadium-nitrogen alloy sintering furnace magnesium aluminate spinel vacuum insulating brick |
| CN112266241A (en) * | 2020-11-03 | 2021-01-26 | 江苏省陶瓷研究所有限公司 | Magnesium aluminate spinel porous ceramic and preparation method thereof |
| CN112745137A (en) * | 2021-01-08 | 2021-05-04 | 武汉科技大学 | Silicon nitride whisker reinforced magnesia-alumina spinel breathable refractory material and preparation method thereof |
| CN112745137B (en) * | 2021-01-08 | 2022-09-13 | 武汉科技大学 | Silicon nitride whisker reinforced magnesia alumina spinel gas-permeable refractory material and preparation method thereof |
| CN113800944A (en) * | 2021-08-23 | 2021-12-17 | 中钢集团洛阳耐火材料研究院有限公司 | Method for preparing micron-pore heat insulation material by virtue of loss on ignition method |
| CN115838298A (en) * | 2022-11-17 | 2023-03-24 | 郑州经纬科技实业有限公司 | Special heat insulation plate for aluminum cell roasting and production method thereof |
| CN115838298B (en) * | 2022-11-17 | 2023-10-13 | 郑州经纬科技实业有限公司 | Special heat-insulating plate for roasting aluminum electrolysis cell and production method thereof |
| CN116409986A (en) * | 2023-04-13 | 2023-07-11 | 河南鑫诚耐火材料股份有限公司 | Fire-resistant fire-blocking brick for upper part of fire path wall of carbon roasting furnace and preparation method thereof |
| CN116239396A (en) * | 2023-05-10 | 2023-06-09 | 东台市圣德尔耐热材料有限公司 | Preparation process of light refractory brick for kiln |
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Application publication date: 20100616 |