CN107954744A - Micropore andalusite light fire brick and preparation method thereof - Google Patents
Micropore andalusite light fire brick and preparation method thereof Download PDFInfo
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- CN107954744A CN107954744A CN201610897149.3A CN201610897149A CN107954744A CN 107954744 A CN107954744 A CN 107954744A CN 201610897149 A CN201610897149 A CN 201610897149A CN 107954744 A CN107954744 A CN 107954744A
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- C04B2235/3427—Silicates other than clay, e.g. water glass
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- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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Abstract
The present invention provides a kind of micropore andalusite light fire brick, including major ingredient and pulp-water, the major ingredient include the material of following mass percents：Andalusite bulky grain 25%~35%, Metakaolin superfine powder 20%~25%, calcium aluminate fine powder 5%~15%, silicon carbide micro-powder 3%~10%, aerosil 10%~20%, expanded graphite 0.08%~0.12%, bonding clay 3%~5%；The quality of the pulp-water is the 4.5%~5.5% of the major ingredient quality.The micropore andalusite light fire brick component collocation is reasonable, material internal is formed with equally distributed micron order stomata so that product has good thermal shock resistance, preferable heat endurance and higher refractoriness under load.The present invention also provides a kind of preparation method of above-mentioned micropore andalusite light fire brick, this method step is simple, is easy to automated production.
Description
Technical field
The invention belongs to technical field of refractory materials, specifically, relate to a kind of micropore andalusite light fire brick and
Its preparation method.
Background technology
Refractory material is due to the corrosion resistance good to high-temperature medium, and the performance with insulation, it is metallurgical,
The high temperature industry such as petrochemical industry, glass is widely used.As energy-saving attention degree is continuously improved in China, there is good protect
The lightweight refracrory of warm heat insulation has obtained more research and developments.Unshape refractory due to construction just
Profit, production cost are low, and the advantage such as overall structure is good of liner body, and receive special attention, wherein being poured especially with fire resisting
Material feeding is applied the most extensive.
Usually used castable refractory is mainly Al2O3-SiO2Material, but this kind of refractory material is in industries such as petrochemical industry
In use, due to the influence of residing reducing atmosphere environment, the damage of refractory material can be caused to aggravate, so that the use of material
Service life reduction.Further, since pore size is larger in traditional refractory aggregate, aperture is in grade more, so when the material
In hot environment in use, since by the aggravation that gas radiation heat transfer is conducted heat with convection current in stomata, refractory material can be made
Thermal conductivity factor raises, and thereby reduces the heat insulation and preservation effect of refractory material, increases the loss of thermal energy, cause energy cost
Rising.
In order to solve the problems, such as present on, people are seeking a kind of preferable technical solution always.
The content of the invention
The purpose of the present invention is in view of the deficiencies of the prior art, so that providing a kind of has higher thermal shock resistance, preferably
Heat insulation and preservation effect micropore andalusite light fire brick.
To achieve these goals, the technical solution adopted in the present invention is：Including major ingredient and pulp-water, wherein the master
Material includes the material of following mass percents：Andalusite bulky grain 25%~35%, Metakaolin superfine powder 20%~25%, calcium aluminate
Fine powder 5%~15%, silicon carbide micro-powder 3%~10%, aerosil 10%~20%, expanded graphite 0.08%~0.12%, knot
Close clay 3%~5%；The quality of the pulp-water is the 4.5%~5.5% of the major ingredient quality.
Based on above-mentioned, the major ingredient includes the material of following mass percents：Andalusite bulky grain 30%~33%, higher ridge
Native superfine powder 23%~25%, calcium aluminate fine powder 8%~12%, silicon carbide micro-powder 5%~10%, aerosil 15%~20%,
Expanded graphite 0.10%~0.12%, bonding clay 4%~5%.
Based on above-mentioned, the granularity of the andalusite bulky grain is the mm of 1 mm~3.
Based on above-mentioned, it is small that the granularity of the Metakaolin superfine powder is less than 0.074 mm, the granularity of the calcium aluminate fine powder
In 0.074 mm.
Based on above-mentioned, the granularity of the silicon carbide micro-powder is less than 0.043 mm.
The present invention also provides a kind of preparation method of micropore andalusite light fire brick, comprise the following steps：
（1）According to above-mentioned mass percent raw material calculate, by andalusite bulky grain, Metakaolin superfine powder, calcium aluminate fine powder,
Expanded graphite and pulp-water carry out mixed grind and prefabricated pug are made；Then silicon carbide micro-powder, dioxy are added into the prefabricated pug
SiClx aeroge, bonding clay simultaneously carry out mixed grind mixed grind pug are made；
（2）The mixed grind pug is pressed into adobe, it is resistance to that the micropore andalusite lightweight is made in the adobe after drying and calcining
Firebrick.
Based on above-mentioned, the step（2）Including：The mixed grind pug is pressed into adobe, and by the adobe in nature
It is dry 24 it is small when, be subsequently placed in dry kiln, under 100 DEG C~200 DEG C of temperature conditionss it is dry 24 it is small when~48 it is small when；Then
By the dried adobe carried out at a temperature of 1100 DEG C~1350 DEG C calcining 10 it is small when~24 it is small when, so as to be made described
Micropore andalusite light fire brick.
The performance effect of each component is as follows in micropore andalusite light fire brick raw material provided by the present invention：
Andalusite：Crystal belongs to orthogonal（Rectangle）The nesosilicate mineral of crystallographic system, andalusite meeting in adobe calcination process
Irreversible crystal transformation occurs and forms the mullite with good mullite network, so as to make it have more than 1800 DEG C
Fire resistance, and resistance to suddenly cold and hot, mechanical strength are big, heat shock resistance power and resistance to slag are strong, loading inversion point is high, and with high
Chemical stability and extremely strong resistance to chemical corrosion so that prepare the low creep andalusite composite refractory brick have
High RUL, low creep, high thermal shock stability.
Metakaolin superfine powder：Metakaolin is the anhydrous aluminium silicate that kaolin is dehydrated formation at moderate temperatures.It is higher
It is irregular that atom, which puts in order, in the soil of ridge, and the steady state of thermodynamics Jie is presented, has gelling under appropriate excitation.Work as temperature
Start crystallization generation mullite and cristobalite when rising to 925 DEG C.Crystal is mainly made of oxygen-octahedron and hydrogen-oxygen octahedron, its
Middle oxygen-octahedron links the clathrum to form Hexagonal array in a manner of sharing apex angle along two-dimensional directional.Kaolin has strong
Acid resistance, good electrical insulating property and higher fire resistance, refractoriness is related with kaolinic chemical composition, pure height
The refractoriness of ridge soil is generally at 1700 DEG C or so, and when hydromica, feldspar content are more, when potassium, sodium, iron content are high, refractoriness reduces,
The refractoriness of metakaolin is minimum to be not less than 1500 DEG C.
Calcium aluminate fine powder：Calcium aluminate is a series of inorganic chemicals sintered at high temperature by calcium oxide and aluminium oxide
Thing, due to the physical property that its hardness is big, fusing point is high, is applied in cement and fire extinguishing material.General formula is mCaOnAl2O3。
Aerosil：It is to be connected with each other the nanometer three-dimensional network skeleton assembled and formed by some Si-O-Si groups
Structure, due to the presence of nearly infinite more nano-pores, solid heat transfer can only be along hole wall transmission, and nearly infinite more air vent walls constitute
It is bordering on " infinite long path " effect so that solid thermal conductance drops to almost lowest limit.Its mesopore size is 2~50nm, works as material
When hole diameter in material is less than 70nm, the air molecule in hole just loses the ability of free-flowing, is relatively attached to gas
On hole wall, at this time, nano-pore is near vacuum state, and the cross-ventilation in material is attenuated to least limit.Due to air
Main component is nitrogen and oxygen, and local thermal excitation can not carry out convection action by air molecule across gel surface, so that
Conduct heat to thermal convection current and produce insulating effect.
Bonding clay：It is a kind of plastic fire clay of tool, its mineral composition is mainly kaolinite, more water kaolinites
Stone, hydromica etc. and generally contain Al2O3In 20%~30%, SiO242%~73%, refractoriness is 1580 DEG C~1670 DEG C.
Expanded graphite：Expanded graphite is the one kind obtained by natural graphite scale through intercalation, washing, drying, high temperature puffing
Loose porous vermiform material.Its except possess the excellent performances such as native graphite cold-hot in itself, corrosion-resistant, self-lubricating with
Outside, also with the unexistent softness of native graphite, compression resilience, adsorptivity, ecological environment harmony, biocompatibility, resistance to
The characteristics such as radiativity.Expanded graphite meet high temperature can 150 ~ 300 times of moment volumetric expansion, vermiform is changed into from sheet, so that structure
Loosely, porous and bend, expanded surface area, surface energy improve, the power enhancing of absorption crystalline flake graphite, can be voluntarily between quasiflake graphite
It is chimeric, so add its flexibility, resilience and plasticity.
The present invention has prominent substantive distinguishing features and significant progress compared with the prior art, and specifically, the present invention is first
First by different grain size and the andalusite bulky grain of length, Metakaolin superfine powder, calcium aluminate fine powder, silicon carbide micro-powder, titanium dioxide
Silica aerogel, expanded graphite, bonding clay are mixed so that each site component proportioning collocation of adobe of preparation is consistent, protects
The uniformity of each position performance of micropore andalusite light fire brick of calcining gained has been demonstrate,proved, while has been dashed forward in raw material containing a large amount of corner angle
The granularity material gone out, increases critical granularity, and providing firm skeleton structure for micropore andalusite light fire brick makes it
Deformation is not likely to produce during.
Secondly, the present invention makes full use of calcium aluminate containing loose structure itself and expanded graphite to be mixed with above-mentioned raw materials,
So that material internal produces a large amount of Minute pores within more times, and the Minute pores will not be with the progress of sintering process and poly-
Collection is grown up, and finally forms micron order and equally distributed stomata in the product.And it is utilized respectively andalusite bulky grain, metakaolin
Superfine powder, calcium aluminate fine powder, silicon carbide micro-powder, the resistance to burning characteristic of aerosil and preferable mouldability cause what is prepared
Micropore andalusite light fire brick has high RUL, low creep, high thermal shock stability.
Embodiment
Below by embodiment, technical scheme is described in further detail.
Embodiment 1
The present embodiment provides a kind of micropore andalusite light fire brick, including major ingredient and pulp-water, wherein under the major ingredient includes
State the material of mass percent：Andalusite bulky grain 30%, Metakaolin superfine powder 20%, calcium aluminate fine powder 15%, silicon carbide micro-powder
10%th, aerosil 19.88%, expanded graphite 0.12%, bonding clay 5%；The quality of the pulp-water is the major ingredient
The 5% of quality.
Wherein, the granularity of the andalusite bulky grain is less than for the mm of 1 mm~3, the granularity of the Metakaolin superfine powder
0.074 mm, the granularity of the calcium aluminate fine powder is less than 0.074 mm, the granularity of the silicon carbide micro-powder is less than 0.043 mm.Respectively
Chemical composition in raw material is as shown in table 1.
Table 1, each raw material main chemical compositions
| Raw material | Al2O3 | Fe2O3 | K2O+NaO | CaO |
| Andalusite bulky grain | 55%~58% | ≤1.1% | ≤1.0% | -- |
| Metakaolin superfine powder | 53%~55% | -- | -- | -- |
| Calcium aluminate fine powder | ≥53% | -- | -- | 29%~31% |
| Bonding clay | 34%~37% | ≤1.5% | ≤0.5% | -- |
The present embodiment also provides a kind of preparation method of the micropore andalusite light fire brick, and specific preparation process includes：
（1）According to above-mentioned mass percent raw material calculate, by andalusite bulky grain, Metakaolin superfine powder, calcium aluminate fine powder,
Expanded graphite and pulp-water carry out mixed grind and prefabricated pug are made；Then silicon carbide micro-powder, dioxy are added into the prefabricated pug
SiClx aeroge, bonding clay simultaneously carry out mixed grind mixed grind pug are made；
（2）The mixed grind pug is pressed into by adobe using brickmaking machine of the pressure tonnage more than 315 tons, and by the adobe certainly
When so drying 24 is small, it is subsequently placed in dry kiln, when drying 24 is small under 200 DEG C of temperature conditionss；Then by dried institute
State adobe carried out at a temperature of 1350 DEG C calcining 10 it is small when so that be made the micropore andalusite light fire brick.After testing,
The micropore andalusite light fire brick density made from the present embodiment is 1.3 g/cm3。
Embodiment 2
The present embodiment provides a kind of micropore andalusite light fire brick, including major ingredient and pulp-water, wherein under the major ingredient includes
State the material of mass percent：Andalusite bulky grain 33%, Metakaolin superfine powder 25%, calcium aluminate fine powder 10%, silicon carbide micro-powder
7%th, aerosil 19.9%, expanded graphite 0.1%, bonding clay 5%；The quality of the pulp-water is the major ingredient quality
5%.
Preparation method in the preparation method and embodiment 1 of micropore andalusite light fire brick described in the present embodiment is substantially
Identical, difference is：
The mixed grind pug is pressed into adobe, is subsequently placed in dry kiln, when drying 48 is small under 200 DEG C of temperature conditionss；
Then by the dried adobe carried out at a temperature of 1100 DEG C calcining 24 it is small when so that be made the micropore andalusite it is light
Refractory brick.
After testing, the micropore andalusite light fire brick density made from the present embodiment is 1.4 g/cm3。
Embodiment 3
The present embodiment provides a kind of micropore andalusite light fire brick, specific material composition is roughly the same with embodiment 1, difference
Be in：
In the present embodiment, andalusite bulky grain 25%, Metakaolin superfine powder 25%, calcium aluminate fine powder 15%, silicon carbide micro-powder 10%,
Aerosil 20%, expanded graphite 0.12%, bonding clay 4.88%.
The preparation method of micropore andalusite light fire brick described in the present embodiment and the preparation method phase in embodiment 1
Together.After testing, the micropore andalusite light fire brick density made from the present embodiment is 1.15 g/cm3。
Micropore andalusite light fire brick performance detection
Bulk density, average pore size, refractoriness, room temperature in the micropore andalusite light fire brick prepared respectively to embodiment 1~3
Compressive resistance and 1350 DEG C of high temperature break resistant intensity performances are detected, and testing result is as shown in table 2.
Table 2, micropore andalusite light fire brick performance detection
As can be seen from the above table：The fire resisting softening point for the micropore andalusite light fire brick that embodiment 1~3 provides is more than 1750
DEG C, cold crushing strength be more than 29MPa, average pore size between 5 microns~7 microns, bulk density is between 1.0 g/cm3~
1.4 g/cm3Between, therefore the micropore andalusite light fire brick property indices meet as defined in GB/T3994-2013
Index, there are equally distributed micron order stomata inside the micropore andalusite light fire brick, while the product has load
The advantages of softening temperature is high, the performance of highly heatproof and shockproof.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, those of ordinary skills in the art should understand that：Still
It can modify to the embodiment of the present invention or equivalent substitution is carried out to some technical characteristics；Without departing from this hair
The spirit of bright technical solution, it should all cover among the claimed technical solution scope of the present invention.
Claims (7)
1. a kind of micropore andalusite light fire brick, including major ingredient and pulp-water, it is characterised in that the major ingredient includes following matter
Measure the material of percentage：Andalusite bulky grain 25%~35%, Metakaolin superfine powder 20%~25%, calcium aluminate fine powder 5%~15%,
Silicon carbide micro-powder 3%~10%, aerosil 10%~20%, expanded graphite 0.08%~0.12%, bonding clay 3%~5%；
The quality of the pulp-water is the 4.5%~5.5% of the major ingredient quality.
2. micropore andalusite light fire brick according to claim 1, it is characterised in that the major ingredient includes following quality
The material of percentage：Andalusite bulky grain 30%~33%, Metakaolin superfine powder 23%~25%, calcium aluminate fine powder 8%~12%, carbon
SiClx micro mist 5%~10%, aerosil 15%~20%, expanded graphite 0.10%~0.12%, bonding clay 4%~5%.
3. micropore andalusite light fire brick according to claim 1 or 2, it is characterised in that the andalusite bulky grain
Granularity be the mm of 1 mm~3.
4. micropore andalusite light fire brick according to claim 3, it is characterised in that the Metakaolin superfine powder
Granularity is less than 0.074 mm, the granularity of the calcium aluminate fine powder is less than 0.074 mm.
5. micropore andalusite light fire brick according to claim 4, it is characterised in that the granularity of the silicon carbide micro-powder
Less than 0.043 mm.
6. a kind of preparation method of micropore andalusite light fire brick, comprises the following steps：
（1）Calculated according to the raw material of any one of Claims 1 to 5 mass percent, by andalusite bulky grain, metakaolin
Superfine powder, calcium aluminate fine powder, expanded graphite and pulp-water carry out mixed grind and prefabricated pug are made；Then add into the prefabricated pug
Enter silicon carbide micro-powder, aerosil, bonding clay and carry out mixed grind mixed grind pug is made；
（2）The mixed grind pug is pressed into adobe, it is resistance to that the micropore andalusite lightweight is made in the adobe after drying and calcining
Firebrick.
7. the preparation method of micropore andalusite light fire brick according to claim 6, it is characterised in that the step
（2）Including：The mixed grind pug is pressed into adobe, and the adobe is placed in dry kiln when natural drying 24 is small,
When drying 24~48 is small under 100 DEG C~200 DEG C of temperature conditionss；Then by the dried adobe 1100 DEG C~1350
Carried out at a temperature of DEG C calcining 10 it is small when~24 it is small when so that be made the micropore andalusite light fire brick.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108675790A (en) * | 2018-06-20 | 2018-10-19 | 三峡大学 | A kind of heat-insulated backing of graphite/carbon SiClx and preparation method thereof |
| CN111302830A (en) * | 2020-04-03 | 2020-06-19 | 张家港市盛澳电炉科技有限公司 | Preparation method of microporous high-temperature-resistant light refractory brick |
| CN113716948A (en) * | 2021-09-13 | 2021-11-30 | 郑州东豫新材料科技有限公司 | Low-heat-conductivity refractory material for high-temperature pipeline system and preparation method thereof |
-
2016
- 2016-10-14 CN CN201610897149.3A patent/CN107954744A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108675790A (en) * | 2018-06-20 | 2018-10-19 | 三峡大学 | A kind of heat-insulated backing of graphite/carbon SiClx and preparation method thereof |
| CN108675790B (en) * | 2018-06-20 | 2021-01-26 | 三峡大学 | Graphite/silicon carbide heat-insulating backing and preparation method thereof |
| CN111302830A (en) * | 2020-04-03 | 2020-06-19 | 张家港市盛澳电炉科技有限公司 | Preparation method of microporous high-temperature-resistant light refractory brick |
| CN111302830B (en) * | 2020-04-03 | 2022-05-10 | 张家港市盛澳电炉科技有限公司 | Preparation method of microporous high-temperature-resistant light refractory brick |
| CN113716948A (en) * | 2021-09-13 | 2021-11-30 | 郑州东豫新材料科技有限公司 | Low-heat-conductivity refractory material for high-temperature pipeline system and preparation method thereof |
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