CN106431440B - A kind of micro- closed pore alumina refractory aggregate of light weight and preparation method thereof - Google Patents
A kind of micro- closed pore alumina refractory aggregate of light weight and preparation method thereof Download PDFInfo
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/185—Mullite 3Al2O3-2SiO2
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0051—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof characterised by the pore size, pore shape or kind of porosity
- C04B38/0054—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof characterised by the pore size, pore shape or kind of porosity the pores being microsized or nanosized
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3218—Aluminium (oxy)hydroxides, e.g. boehmite, gibbsite, alumina sol
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Abstract
The present invention relates to micro- closed pore alumina refractory aggregates of a kind of light weight and preparation method thereof.Its technical solution is: with 3 ~ 10 DEG C/min of heating rate, by blocky alumina raw material temperature-gradient method to final temperature to get the micro- closed pore alumina refractory aggregate of light weight.The temperature-gradient method to final temperature is: when temperature rises to 300 DEG C, 400 DEG C, 500 DEG C, 600 DEG C, 900 DEG C, 1100 DEG C, 1200 DEG C and final temperature respectively, respectively keeping the temperature 1 ~ 4 hour.The final temperature is 1500 ~ 1650 DEG C.The Al of the bulk alumina raw material2O3Content >=45wt%.Present invention process is simply and at low cost, and the micro- closed pore alumina refractory aggregate of prepared light weight has the characteristics that apparent porosity is low, closed porosity is high, intensity is high and average pore size is small.
Description
Technical field
The invention belongs to technical field of refractory materials.More particularly to a kind of micro- closed pore alumina refractory aggregate of light weight and its preparation
Method.
Background technique
With the fast development of Chinese economy, the industry of high energy consumption, such as steel, cement, power industry are to the need of the energy
It asks and increasingly increases, energy shortage becomes increasingly conspicuous with the contradiction that demand increases sharply.Used in modern high temperature industry does not require nothing more than
Refractory material have excellent mechanical strength, Spalling resistance can well and anti-erosion and performance of flushing it is excellent, also require low energy consumption
With thermal efficiency height.Therefore, the high-quality refractory material that exploitation meets above-mentioned multiple functions becomes the research weight of refractories industry
Point.
Refractory material for working layer lightweight be considered as be possible to realize refractory material have high-quality, it is multi-functional effectively
Approach.Firstly, lightweight is able to ascend the heat-proof quality of working lining, reduces heat dissipation, so that heat loss and heating cost are reduced,
It is advantageously implemented energy-saving and emission-reduction；Secondly, the stomata introduced in weight reduction process can effectively accommodate thermal stress in jump in temperature,
Be conducive to be promoted the Spalling resistance energy of refractory material for working layer；Finally, when prepared light weight refractory material pore size compared with
Hour, the slag resistance of refractory material and mechanical strength are influenced little, in some instances it may even be possible to be promoted.
In recent years, carried out all over the world many about light weight aggregate and its corresponding working lining light weight refractory material
Research, and the method for reporting many preparation light weight aggregates, such as organic matter decomposition method, in-situ pore-formed technology and hydroxide/
Carbonate decomposition method etc..However above-mentioned preparation method is used, and it is all by raw material grinding reshaping, on the one hand the process is more complicated,
Importantly, the usual apparent porosity of prepared refractory aggregate is higher, aperture is larger, can not be resisted in use process slag and
The erosion and infiltration of high-temperature medium.
" a kind of micropore light weight alumina refractory aggregate and preparation method thereof " (ZL 201410447797.X) patented technology, is adopted
It is prepared for a kind of micropore light weight alumina refractory aggregate with wet process, prepared product has lower apparent porosity and aperture, so
And used wet method preparation process is complex, it is more difficult to realize industrialized production.
Summary of the invention
The present invention is directed to overcome prior art defect, task is to provide a kind of simple process and the micro- closed pore of light weight at low cost
Alumina refractory aggregate preparation method；With this method prepare the micro- closed pore alumina refractory aggregate apparent porosity of light weight is low, closed pore
Rate is high, intensity is high and average pore size is small.
To realize above-mentioned task, the technical scheme adopted by the invention is that: with 3 ~ 10 DEG C/min of heating rate, by block
Shape alumina raw material temperature-gradient method is to final temperature to get the micro- closed pore alumina refractory aggregate of light weight.
The temperature-gradient method to final temperature is: when temperature rise to respectively 300 DEG C, 400 DEG C, 500 DEG C, 600 DEG C, 900 DEG C,
1100 DEG C, 1200 DEG C and when final temperature, respectively keep the temperature 1 ~ 4 hour.
The final temperature is 1500 ~ 1650 DEG C.
The Al of the bulk alumina raw material2O3Content >=45wt%.
Due to the adoption of the above technical scheme, the present invention has following good effect compared with prior art:
1) present invention is blocky alumina raw material dinectly bruning using natural bauxite block rawore, and utilizes natural bauxite
A series of decomposition, crystalline substance occur at different temperatures for the mineral compositions such as a diaspore, boehmite, kaolinite and gibbsite in rawore
The characteristics of type changes, carries out isothermal holding, the constitution water and the crystallization water in above-mentioned mineral can be slow at corresponding temperature
Abjection, so that hole caused by decomposition and crystal transfer is retained in inside blank；Simple process and at low cost.
2) the natural bauxite block rawore that the present invention uses primary mullite and secondary mullite in calcination process
Change process will lead to certain volume expansion, which can result in blank internal in-situ and form a certain number of holes.
Under the premise of hole is formed in situ in the present invention, specific heat treatment is carried out under high temperature, promotes crystal boundary rate travel, so that on
It states the closing of pores and closed pore is formed in situ, the micro- closed pore alumina refractory aggregate bulk density of light weight obtained is low, apparent porosity is low
And closed porosity is high.
The micro- closed pore alumina refractory aggregate of light weight prepared by the present invention is through detecting: bulk density is 2.6 ~ 3.0g/cm3, show
The porosity is 2 ~ 10%, and average pore size is 0.5 ~ 2 μm.
Therefore, present invention process is simply and at low cost, and the micro- closed pore alumina refractory aggregate of prepared light weight has apparent pore
The feature that rate is low, closed porosity is high, intensity is high and average pore size is small.
Specific embodiment
The invention will be further described With reference to embodiment, not to the limitation of its protection scope:
The Al of blocky alumina raw material described in present embodiment2O3Content >=45wt% repeats no more in embodiment.
Embodiment 1
A kind of micro- closed pore alumina refractory aggregate of light weight and preparation method thereof.Preparation method described in the present embodiment is: with 3 ~ 7
DEG C/min heating rate, by blocky alumina raw material temperature-gradient method to final temperature to get the micro- closed pore alumina fire resisting bone of light weight
Material.
Temperature-gradient method described in the present embodiment to final temperature is: when temperature rises to 300 DEG C, 400 DEG C, 500 DEG C, 600 respectively
DEG C, 900 DEG C, 1100 DEG C, 1200 DEG C and when final temperature, respectively keep the temperature 1 ~ 3 hour.
The final temperature is 1550 ~ 1650 DEG C.
The micro- closed pore alumina refractory aggregate of light weight prepared by the present embodiment is through detecting: bulk density is 2.6 ~ 2.7g/cm3；
Apparent porosity is 6 ~ 10%；Average pore size is 1 ~ 2 μm.
Embodiment 2
A kind of micro- closed pore alumina refractory aggregate of light weight and preparation method thereof.Preparation method described in the present embodiment is: with 3 ~ 7
DEG C/min heating rate, by blocky alumina raw material temperature-gradient method to final temperature to get the micro- closed pore alumina fire resisting bone of light weight
Material.
Temperature-gradient method described in the present embodiment to final temperature is: when temperature rises to 300 DEG C, 400 DEG C, 500 DEG C, 600 respectively
DEG C and at 900 DEG C, respectively keep the temperature 1 ~ 3 hour；When temperature rises to 1100 DEG C and 1200 DEG C respectively, respectively 2 ~ 4 hours are kept the temperature；Work as temperature
When rising to final temperature, 1 ~ 3 hour is kept the temperature.
The final temperature is 1550 ~ 1650 DEG C.
The micro- closed pore alumina refractory aggregate of light weight prepared by the present embodiment is through detecting: bulk density is 2.6 ~ 2.75g/cm3；
Apparent porosity is 5 ~ 10%；Average pore size is 0.9 ~ 2 μm.
Embodiment 3
A kind of micro- closed pore alumina refractory aggregate of light weight and preparation method thereof.Preparation method described in the present embodiment is: with 3 ~ 7
DEG C/min heating rate, by blocky alumina raw material temperature-gradient method to final temperature to get the micro- closed pore alumina fire resisting bone of light weight
Material.
The temperature-gradient method to final temperature is: when temperature rises to 300 DEG C, 400 DEG C, 500 DEG C, 600 DEG C and 900 DEG C respectively
When, 2 ~ 4 hours respectively are kept the temperature, when temperature rises to 1100 DEG C, 1200 DEG C and final temperature respectively, respectively keeps the temperature 1 ~ 3 hour.
The final temperature is 1550 ~ 1650 DEG C.
The micro- closed pore alumina refractory aggregate of light weight prepared by the present embodiment is through detecting: bulk density is 2.7 ~ 2.85g/cm3；
Apparent porosity is 5 ~ 8%；Average pore size is 0.8 ~ 1.6 μm.
Embodiment 4
A kind of micro- closed pore alumina refractory aggregate of light weight and preparation method thereof.Preparation method described in the present embodiment is: with 3 ~ 7
DEG C/min heating rate, by blocky alumina raw material temperature-gradient method to final temperature to get the micro- closed pore alumina fire resisting bone of light weight
Material.
Temperature-gradient method described in the present embodiment to final temperature is: when temperature rises to 300 DEG C, 400 DEG C, 500 DEG C, 600 respectively
DEG C, 900 DEG C, 1100 DEG C and at 1200 DEG C, respectively keep the temperature 2 ~ 4 hours；When temperature rises to final temperature, 1 ~ 3 hour is kept the temperature.
The final temperature is 1550 ~ 1650 DEG C.
The micro- closed pore alumina refractory aggregate of light weight prepared by the present embodiment is through detecting: bulk density is 2.6 ~ 2.85g/cm3；
Apparent porosity is 5 ~ 8%；Average pore size is 0.7 ~ 1.5 μm.
Embodiment 5
A kind of micro- closed pore alumina refractory aggregate of light weight and preparation method thereof.Preparation method described in the present embodiment is: with 6 ~ 10
DEG C/min heating rate, by blocky alumina raw material temperature-gradient method to final temperature to get the micro- closed pore alumina fire resisting bone of light weight
Material.
Temperature-gradient method described in the present embodiment to final temperature is: when temperature rises to 300 DEG C, 400 DEG C, 500 DEG C, 600 respectively
DEG C, 900 DEG C, 1100 DEG C and at 1200 DEG C, respectively keep the temperature 1 ~ 3 hour；When temperature rises to final temperature, 2 ~ 4 hours are kept the temperature.
The final temperature is 1500 ~ 1600 DEG C.
The micro- closed pore alumina refractory aggregate of light weight prepared by the present embodiment is through detecting: bulk density is 2.7 ~ 2.95g/cm3；
Apparent porosity is 5 ~ 8%；Average pore size is 0.7 ~ 1.3 μm.
Embodiment 6
A kind of micro- closed pore alumina refractory aggregate of light weight and preparation method thereof.Preparation method described in the present embodiment is: with 6 ~ 10
DEG C/min heating rate, by blocky alumina raw material temperature-gradient method to final temperature to get the micro- closed pore alumina fire resisting bone of light weight
Material.
Temperature-gradient method described in the present embodiment to final temperature refers to: when temperature rise to respectively 300 DEG C, 400 DEG C, 500 DEG C,
At 600 DEG C and 900 DEG C, respectively keep the temperature 1 ~ 3 hour, when temperature rises to 1100 DEG C, 1200 DEG C and final temperature respectively, respectively keep the temperature 2 ~
4 hours.The final temperature is 1500 ~ 1600 DEG C.
The micro- closed pore alumina refractory aggregate of light weight prepared by the present embodiment is through detecting: bulk density is 2.75 ~ 2.95g/
cm3；Apparent porosity is 4 ~ 9%；Average pore size is 0.6 ~ 1.2 μm.
Embodiment 7
A kind of micro- closed pore alumina refractory aggregate of light weight and preparation method thereof.Preparation method described in the present embodiment is: with 6 ~ 10
DEG C/min heating rate, by blocky alumina raw material temperature-gradient method to final temperature to get the micro- closed pore alumina fire resisting bone of light weight
Material.
The temperature-gradient method to final temperature refers to: when temperature rises to 300 DEG C, 400 DEG C, 500 DEG C, 600 DEG C and 900 respectively
DEG C when, respectively keep the temperature 2 ~ 4 hours；When temperature rises to 1100 DEG C and 1200 DEG C respectively, respectively 1 ~ 3 hour is kept the temperature；When temperature rises to most
When finishing temperature, 2 ~ 4 hours are kept the temperature.
The final temperature is 1500 ~ 1600 DEG C.
The micro- closed pore alumina refractory aggregate of light weight prepared by the present embodiment is through detecting: bulk density is 2.75 ~ 3.0g/cm3；
Apparent porosity is 3 ~ 6%；Average pore size is 0.6 ~ 1 μm.
Embodiment 8
A kind of micro- closed pore alumina refractory aggregate of light weight and preparation method thereof.Preparation method described in the present embodiment is: with 6 ~ 10
DEG C/min heating rate, by blocky alumina raw material temperature-gradient method to final temperature to get the micro- closed pore alumina fire resisting bone of light weight
Material.
Temperature-gradient method described in the present embodiment to final temperature refers to: when temperature rise to respectively 300 DEG C, 400 DEG C, 500 DEG C,
600 DEG C, 900 DEG C, 1100 DEG C, 1200 DEG C and when final temperature, respectively keep the temperature 2 ~ 4 hours.
The final temperature is 1500 ~ 1600 DEG C.
The micro- closed pore alumina refractory aggregate of light weight prepared by the present embodiment is through detecting: bulk density is 2.8 ~ 3.0g/cm3；
Apparent porosity is 2 ~ 7%；Average pore size is 0.5 ~ 0.9 μm.
Present embodiment has following good effect compared with prior art:
1) present embodiment is blocky alumina raw material dinectly bruning using natural bauxite block rawore, and utilizes day
A system occurs at different temperatures for the mineral compositions such as a diaspore, boehmite, kaolinite and gibbsite in right bauxite rawore
The characteristics of column decomposition, crystal transfer, isothermal holding, constitution water and the crystallization water in above-mentioned mineral are carried out at corresponding temperature
Can slowly it deviate from, so that hole caused by decomposition and crystal transfer is retained in inside blank；Simple process and at low cost.
2) the natural bauxite block rawore that present embodiment uses primary mullite and two in calcination process
Secondary mullitization process will lead to certain volume expansion, which can result in blank internal in-situ and form certain amount
Hole.Under the premise of hole is formed in situ in present embodiment, specific heat treatment is carried out under high temperature, promotes crystal boundary
Rate travel, so that closed pore is formed in situ in the above-mentioned closing of pores, the micro- closed pore alumina refractory aggregate volume of light weight obtained is close
Spend that low, apparent porosity is low and closed porosity is high.
The micro- closed pore alumina refractory aggregate of light weight prepared by present embodiment is through detecting: bulk density be 2.6 ~
3.0g/cm3, apparent porosity is 2 ~ 10%, and average pore size is 0.5 ~ 2 μm.
Therefore, present embodiment simple process and at low cost, the micro- closed pore alumina refractory aggregate tool of prepared light weight
Have the characteristics that apparent porosity is low, closed porosity is high, intensity is high and average pore size is small.
Claims (3)
1. a kind of preparation method of the micro- closed pore alumina refractory aggregate of light weight, it is characterised in that with 3 ~ 10 DEG C/min of heating rate,
By blocky alumina raw material temperature-gradient method to final temperature to get the micro- closed pore alumina refractory aggregate of light weight；
The temperature-gradient method to final temperature is: when temperature rises to 300 DEG C, 400 DEG C, 500 DEG C, 600 DEG C, 900 DEG C, 1100 respectively
DEG C, 1200 DEG C and when final temperature, respectively keep the temperature 1 ~ 4 hour；
Final temperature is 1500 ~ 1650 DEG C.
2. the preparation method of the micro- closed pore alumina refractory aggregate of light weight according to claim 1, it is characterised in that the bulk
The Al of alumina raw material2O3Content >=45wt%.
3. a kind of micro- closed pore alumina refractory aggregate of light weight, it is characterised in that the micro- closed pore alumina refractory aggregate of the light weight is basis
The micro- closed pore of light weight prepared by the preparation method of the micro- closed pore alumina refractory aggregate of light weight described in any one of claim 1 ~ 2
Alumina refractory aggregate.
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Effective date of registration: 20200723 Address after: 032300 Nanyang village, Nanyang Township, Xiaoyi City, Shanxi, Lvliang Patentee after: Shanxi Mingjing refractory Co., Ltd Address before: 430081 construction of Qingshan District, Hubei, Wuhan Patentee before: WUHAN University OF SCIENCE AND TECHNOLOGY |