CN107954742A - Light porous refractory brick and preparation method thereof - Google Patents

Light porous refractory brick and preparation method thereof Download PDF

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Publication number
CN107954742A
CN107954742A CN201610897147.4A CN201610897147A CN107954742A CN 107954742 A CN107954742 A CN 107954742A CN 201610897147 A CN201610897147 A CN 201610897147A CN 107954742 A CN107954742 A CN 107954742A
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refractory brick
porous refractory
light porous
fine powder
major ingredient
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张微微
计富宝
吉飞虎
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Henan Haina New Material Co Ltd
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Henan Haina New Material Co Ltd
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Abstract

The present invention provides a kind of light porous refractory brick, including major ingredient and pulp-water, the major ingredient include the material of following mass percents:Andalusite bulky grain 25%~35%, flyash 20%~25%, calcium aluminate fine powder 5%~15%, hollow glass micropearl 3%~10%, mullite fine powder 5%~10%, expanded graphite 0.08%~0.12%, bonding clay 3%~5%, aerosil 5%~10;The quality of the pulp-water is the 5%~8% of the major ingredient quality.The light porous refractory 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 light porous refractory brick, this method step is simple, is easy to automated production.

Description

Light porous refractory brick and preparation method thereof
Technical field
The invention belongs to technical field of refractory materials, specifically, relate to a kind of light porous refractory 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 light porous refractory brick.
To achieve these goals, the technical solution adopted in the present invention is:A kind of light porous refractory brick, including major ingredient And pulp-water, wherein, the major ingredient includes the material of following mass percents:Andalusite bulky grain 25%~35%, flyash 20% ~25%, calcium aluminate fine powder 5%~15%, hollow glass micropearl 3%~10%, mullite fine powder 5%~10%, expanded graphite 0.08%~ 0.12%th, bonding clay 3%~5%, aerosil 5%~10;The quality of the pulp-water is the 5% of the major ingredient quality ~8%.
Based on above-mentioned, the major ingredient includes the material of following mass percents:Andalusite bulky grain 30%~33%, flyash 23%~25%, calcium aluminate fine powder 8%~12%, hollow glass micropearl 5%~10%, mullite fine powder 6%~10%, expanded graphite 0.10%~0.12%, bonding clay 4%~5%, aerosil 8%~10%.
Based on above-mentioned, the granularity of the andalusite bulky grain is the mm of 1 mm~3.
Based on above-mentioned, the granularity of the flyash is less than 0.074 mm, the granularity of the calcium aluminate fine powder is less than 0.074 mm。
Based on above-mentioned, the granularity of the hollow glass micropearl is less than 0.043 mm, the granularity of the mullite fine powder is less than 0.043 mm。
The present invention also provides a kind of preparation method of light porous refractory brick, comprise the following steps:
(1)Calculated according to the raw material of above-mentioned mass percent, andalusite bulky grain, flyash, mullite fine powder, calcium aluminate is thin Powder, expanded graphite and pulp-water carry out mixed grind and prefabricated pug are made;Then into the prefabricated pug add hollow glass micropearl, Aerosil, bonding clay simultaneously carry out mixed grind mixed grind pug are made;
(2)The mixed grind pug is pressed into adobe, the light porous refractory brick is made in the adobe after drying and calcining.
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 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 will 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 that be made it is described micro- Hole light fire brick.
The performance effect of each component is as follows in light porous refractory brick raw material provided by the present invention:
Andalusite bulky grain:Crystal belongs to orthogonal(Rectangle)The nesosilicate mineral of crystallographic system, andalusite are calcined in adobe Cheng Zhonghui occurs irreversible crystal transformation and forms the mullite with good mullite network, so as to make it have 1800 DEG C Fire resistance above, 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 have There are high chemical stability and extremely strong resistance to chemical corrosion, so that the low creep andalusite composite fire prepared Brick has high RUL, low creep, high thermal shock stability.
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 mCaOnAl2O3
Hollow glass micropearl:Hollow glass micropearl is developed in recent years a kind of widely used, excellent performance new Section bar material, the main component of the product are borosilicates, the hollow ball that granularity is 10-250 microns, wall thickness is 1-2 microns.Should Product has the advantages that the high and good chemical stability of light, low heat conduction, intensity, also has insulation, self-lubricating, sound insulation, no The excellent properties such as water suction, fire resisting, corrosion-resistant, radiation protection, nontoxic.Hollow glass micropearl is made of inorganic material, by chemistry Component has:Silica, aluminium oxide, zirconium oxide, magnesia, sodium metasilicate etc..Ten to hundreds of microns of its particle diameter, is full of to be internal CO2The closing microsphere of gas.Hollow glass micropearl has obvious mitigation weight and sound-insulating effect, has product Good crack resistance energy and cycling processability, are widely used in fields such as insulating moulding coatings.
Mullite fine powder:It is a series of mineral general designation of aluminosilicate compositions, there is high temperature resistant, intensity high thermal conductivity coefficient It is small, the features such as energy-saving effect is notable, suitable for petroleum cracking stove, metallurgical hot-blast stove, ceramic roller kiln, tunnel oven, electroceramics shuttle The liner of kiln, removing appts. of glass crucible and various electric furnaces, can directly contact flame.
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.
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 Hole diameter in material<During 70nm, the air molecule in hole just loses the ability of free-flowing, is relatively attached to air vent wall On, at this time, nano-pore is near vacuum state, and the cross-ventilation in material is attenuated to least limit.It is main due to air Component is nitrogen and oxygen, and local thermal excitation can not carry out convection action by air molecule across gel surface, so as to heat Convection current heat transfer produces insulating effect.
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, flyash, calcium aluminate fine powder, hollow glass micropearl, mullite fine powder, swollen Swollen graphite, bonding clay, aerosil are mixed so that each site component proportioning collocation one of adobe of preparation Cause, ensure that the uniformity of each position performance of light porous refractory brick of calcining gained, while dash 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 light porous refractory brick makes it using process In be not likely to produce deformation.
Meanwhile 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.Meanwhile it is utilized respectively andalusite bulky grain, fine coal Ash, the resistance to burning characteristic of calcium aluminate fine powder, hollow glass micropearl, mullite fine powder and preferable mouldability make it that the micropore of preparation is light Refractory 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 light porous refractory brick, including major ingredient and pulp-water, the major ingredient includes following quality percentages Several materials:Andalusite bulky grain 30%, flyash 20%, calcium aluminate fine powder 15%, hollow glass micropearl 10%, mullite fine powder 9.88%th, expanded graphite 0.12%, bonding clay 5%, aerosil 10%;The quality of the pulp-water is the major ingredient matter The 8% of amount.Wherein, the granularity of the andalusite bulky grain be the mm of 1 mm~3, the granularity of the flyash be less than 0.074 mm, The granularity of the calcium aluminate fine powder less than 0.074 mm, the hollow glass micropearl granularity less than 0.043 mm, it is described not come The granularity of stone fine powder is less than 0.043 mm.Chemical composition in each raw material is as shown in table 1.
Table 1, each raw material main chemical compositions
Raw material Al2O3 Fe2O3 K2O+NaO CaO
Mullite fine powder 67%~72% ≤1.0% ≤1.0% --
Andalusite bulky grain 55%~58% ≤1.1% ≤1.0% --
Hollow glass micropearl 34%~37% ≤1.5% ≤0.5% --
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 light porous refractory brick, and specific preparation process includes:
(1)Calculated according to the raw material of above-mentioned mass percent, by andalusite bulky grain, flyash, calcium aluminate fine powder, expansion stone Ink, mullite fine powder and pulp-water carry out mixed grind and prefabricated pug are made;Then it is micro- that hollow glass is added into the prefabricated pug Pearl, aerosil, 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 It is placed on when so dry 24 is small in dry kiln, when drying 24 is small under 200 DEG C of temperature conditionss;Then by the dried brick Base carried out at a temperature of 1350 DEG C calcining 10 it is small when so that be made the light porous refractory brick.After testing, the present embodiment system The light porous refractory brick density obtained is 0.9 g/cm3
Embodiment 2
The present embodiment provides a kind of light porous refractory brick, including major ingredient and pulp-water, the major ingredient includes following quality percentages Several materials:Andalusite bulky grain 33%, flyash 25%, calcium aluminate fine powder 10%, hollow glass micropearl 7%, mullite fine powder 9.9%th, expanded graphite 0.1%, bonding clay 5%, aerosil 10%;The quality of the pulp-water is the major ingredient quality 6%.
The preparation method of light porous refractory brick described in the present embodiment is roughly the same with the preparation method in embodiment 1, 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 light porous fire resisting Brick.
After testing, the light porous refractory brick density made from the present embodiment is 0.8 g/cm3
Embodiment 3
The present embodiment provides a kind of light porous refractory brick, specific material composition is roughly the same with embodiment 1, and difference exists In:
In the present embodiment, the major ingredient includes the material of following mass percents:Andalusite bulky grain 35%, flyash 25%, aluminium Sour calcium fine powder 15%, hollow glass micropearl 10%, mullite fine powder 5%, expanded graphite 0.12%, bonding clay 4.88%, silica Aeroge 5%
The preparation method of light porous refractory brick described in the present embodiment is identical with the preparation method in embodiment 1.After testing, originally The light porous refractory brick density is 0.9g/cm made from embodiment3
Light porous refractory brick performance detection
Bulk density, average pore size, refractoriness, the resistance to pressure of room temperature in the light porous refractory brick prepared respectively to embodiment 1~3 Degree and 1350 DEG C of high temperature break resistant intensity performances are detected, and testing result is as shown in table 2.
Table 2, light porous refractory brick performance detection
As can be seen from the above table:Embodiment 1~3 provide light porous refractory brick fire resisting softening point be more than 1750 DEG C, often Warm compressive resistance be more than 29MPa, average pore size between 5 microns~7 microns, bulk density is between 0.8 g/cm3~1.0 g/cm3Between, therefore the light porous refractory brick property indices meet GB/T3994-2013 set quotas, it is described There are equally distributed micron order stomata inside light porous refractory brick, while the product has load softening temperature height, highly resistance The advantages of performance of thermal shock.
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 light porous refractory brick, including major ingredient and pulp-water, it is characterised in that the major ingredient includes following quality percentages Several materials:Andalusite bulky grain 25%~35%, flyash 20%~25%, calcium aluminate fine powder 5%~15%, hollow glass micropearl 3% ~10%, mullite fine powder 5%~10%, expanded graphite 0.08%~0.12%, bonding clay 3%~5%, aerosil 5% ~10;The quality of the pulp-water is the 5%~8% of the major ingredient quality.
2. light porous refractory brick according to claim 1, it is characterised in that the major ingredient includes following mass percents Material:Andalusite bulky grain 30%~33%, flyash 23%~25%, calcium aluminate fine powder 8%~12%, hollow glass micropearl 5%~ 10%th, mullite fine powder 6%~10%, expanded graphite 0.10%~0.12%, bonding clay 4%~5%, aerosil 8%~ 10%。
3. light porous refractory brick according to claim 1 or 2, it is characterised in that the granularity of the andalusite bulky grain For the mm of 1 mm~3.
4. light porous refractory brick according to claim 3, it is characterised in that the granularity of the flyash is less than 0.074 Mm, the granularity of the calcium aluminate fine powder are less than 0.074 mm.
5. light porous refractory brick according to claim 4, it is characterised in that the granularity of the hollow glass micropearl is less than 0.043 mm, the granularity of the mullite fine powder are less than 0.043 mm.
6. a kind of preparation method of light porous refractory brick, comprises the following steps:
(1)According to any one of Claims 1 to 5 mass percent raw material calculate, by andalusite bulky grain, flyash, Mullite fine powder, calcium aluminate fine powder, expanded graphite and pulp-water carry out mixed grind and prefabricated pug are made;Then to the prefabricated pug Middle addition hollow glass micropearl, aerosil, bonding clay simultaneously carry out mixed grind mixed grind pug are made;
(2)The mixed grind pug is pressed into adobe, the light porous refractory brick is made in the adobe after drying and calcining.
7. the preparation method of light porous refractory brick according to claim 6, it is characterised in that the step(2)Including: The mixed grind pug is pressed into adobe, and by the adobe spontaneously dry 24 it is small when be placed in dry kiln, 100 DEG C~ Under 200 DEG C of temperature conditionss it is dry 24 it is small when~48 it is small when;Then by the dried adobe at 1100 DEG C~1350 DEG C At a temperature of carry out calcining 10 it is small when~24 it is small when so that be made the light porous refractory brick.
CN201610897147.4A 2016-10-14 2016-10-14 Light porous refractory brick and preparation method thereof Withdrawn CN107954742A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109437936A (en) * 2018-12-26 2019-03-08 武汉如星科技有限公司 A kind of prefabricated insulating brick of moulding by casting ladle
CN112851391A (en) * 2021-01-23 2021-05-28 淄博舜禹耐火材料有限公司 Novel energy-saving light mullite refractory material and preparation method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109437936A (en) * 2018-12-26 2019-03-08 武汉如星科技有限公司 A kind of prefabricated insulating brick of moulding by casting ladle
CN109437936B (en) * 2018-12-26 2021-11-26 武汉如星科技有限公司 Prefabricated heat insulation brick for casting formed steel ladle
CN112851391A (en) * 2021-01-23 2021-05-28 淄博舜禹耐火材料有限公司 Novel energy-saving light mullite refractory material and preparation method thereof

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Application publication date: 20180424