CN107954745A - Corrosion-resistant micro-pore mullite light fire brick and preparation method thereof - Google Patents

Corrosion-resistant micro-pore mullite light fire brick and preparation method thereof Download PDF

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CN107954745A
CN107954745A CN201610897314.5A CN201610897314A CN107954745A CN 107954745 A CN107954745 A CN 107954745A CN 201610897314 A CN201610897314 A CN 201610897314A CN 107954745 A CN107954745 A CN 107954745A
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corrosion
light fire
adobe
fire brick
resistant micro
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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 corrosion-resistant micro-pore mullite light fire brick, it includes refractory brick matrix and the high-temperaure coating coated in the refractory brick matrix surface;Wherein, the raw material of the refractory brick matrix includes:Mullite bulky grain 20%~30%, andalusite little particle 15%~25%, Metakaolin superfine powder 13%~24%, bonding clay 5%~10%, expanded graphite 0.5%~1.5%, flyash 15%~20%, hollow glass micropearl 3%~6%, surplus are pulp-water;The raw material of the high-temperaure coating includes:Aerosil 65%~70%, yittrium oxide gel 15%~17%, nano-silicon nitride 5%~10%, crystal whisker of hexa potassium titanate 1%~3%, ethanol balance are ethanol.The present invention also provides a kind of preparation method of corrosion-resistant micro-pore mullite light fire brick, this method step is simple, is easy to automated production.

Description

Corrosion-resistant micro-pore mullite light fire brick and preparation method thereof
Technical field
The invention belongs to technical field of refractory materials, specifically, it is resistance to relate to a kind of corrosion-resistant micro-pore mullite lightweight Firebrick and preparation method thereof.
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 corrosion-resistant micro-pore mullite light fire brick.
To achieve these goals, the technical solution adopted in the present invention is:A kind of corrosion-resistant micro-pore mullite lightweight is resistance to Firebrick, it includes refractory brick matrix and the high-temperaure coating coated in the refractory brick matrix surface;Wherein, the refractory brick base The preparing raw material of body includes:Mullite bulky grain 20%~30%, andalusite little particle 15%~25%, Metakaolin superfine powder 13% ~24%, bonding clay 5%~10%, expanded graphite 0.5%~1.5%, flyash 15%~20%, hollow glass micropearl 3%~6%, remaining Measure as pulp-water;The preparing raw material of the high-temperaure coating includes:Aerosil 65%~70%, yittrium oxide gel 15% ~17%, nano-silicon nitride 5%~10%, crystal whisker of hexa potassium titanate 1%~3%, ethanol balance are ethanol.
Based on above-mentioned, the mullite bulky grain particle diameter is the mm of 1 mm~3, the andalusite little particle particle diameter is 0.5 The mm of mm~1.
Based on above-mentioned, the Metakaolin superfine powder granularity is less than 0.043mm, the hollow glass micropearl granularity is less than 1mm。
The present invention also provides a kind of preparation method of corrosion-resistant micro-pore mullite light fire brick, comprise the following steps:
According to above-mentioned mass percent raw material calculate, by mullite bulky grain, andalusite little particle, Metakaolin superfine powder, Bonding clay, expanded graphite, flyash, hollow glass micropearl and pulp-water carry out mixed grind and prefabricated pug are made, by the mixed grind Pug is pressed into adobe and drying;
Aerosil, yittrium oxide gel, crystal whisker of hexa potassium titanate, nano-silicon nitride and ethanol are mixed to prepare high temperature resistant to apply The dried adobe, is then immersed in the high-temperature resistant coating and coating adobe is made, the coating adobe is through dry by material The corrosion-resistant micro-pore mullite light fire brick is made after dry, calcining.
Based on above-mentioned, the mixed grind pug is pressed into adobe, and by the adobe spontaneously dry 24 it is small when be placed on 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 It is immersed in the high-temperature resistant coating and coating adobe is made, and it is small that calcining 10 is carried out at a temperature of 1100 DEG C~1350 DEG C to it When~24 it is small when so that be made the corrosion-resistant micro-pore mullite light fire brick.
The performance effect of each component is as follows in corrosion-resistant micro-pore mullite light fire brick raw material provided by the present invention:
Mullite bulky grain:It is a series of mineral general designation of aluminosilicate compositions, it is small with high temperature resistant, intensity high thermal conductivity coefficient, 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 kiln, The liner of removing appts. of glass crucible and various electric furnaces, can directly contact flame.
Andalusite little particle:Crystal belongs to orthogonal(Rectangle)The nesosilicate mineral of crystallographic system, andalusite are forged in adobe Irreversible crystal transformation can occur during burning and form the mullite with good mullite network, so as to make it have More than 1800 DEG C of 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 Height, and there is high chemical stability and extremely strong resistance to chemical corrosion, so that the low creep andalusite prepared Composite refractory brick has high RUL, low creep, high thermal shock stability.
Metakaolin superfine powder:Metakaolin be kaolin at moderate temperatures take off ethanol formed without ethanol alumina silicate. It is irregular that atom, which puts in order, in metakaolin, and the steady state of thermodynamics Jie is presented, has gelling under appropriate excitation.When Temperature starts crystallization generation mullite and cristobalite when rising to 925 DEG C.Crystal is mainly by oxygen-octahedron and hydrogen-oxygen octahedron group Into wherein oxygen-octahedron links the clathrum to form Hexagonal array in a manner of sharing apex angle along two-dimensional directional.Kaolin With strong acid resistance, good electrical insulating property and higher fire resistance, refractoriness is related with kaolinic chemical composition, Pure kaolinic refractoriness is generally at 1700 DEG C or so, resistance to when potassium, sodium, iron content are high when ethanol mica, feldspar content are more Fiery degree reduces, and the refractoriness of metakaolin is minimum to be not less than 1500 DEG C.
Bonding clay:It is a kind of plastic fire clay of tool, its mineral composition is mainly kaolinite, more ethanol kaolinites Stone, ethanol mica etc. and generally contain Al2O3In 20%~30%, SiO242%~73%, refractoriness is 1580 DEG C~1670 DEG C.
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 Inhale the excellent properties such as ethanol, fire resisting, corrosion-resistant, radiation protection, nontoxic.Hollow glass micropearl is made of inorganic material, by change Studying point 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.
Expanded graphite:Expanded graphite be washed, dried through intercalation, ethanol by natural graphite scale, one that high temperature puffing obtains The loose porous vermiform material of kind.It is except possessing the excellent performances such as native graphite cold-hot in itself, corrosion-resistant, self-lubricating In addition, also with the unexistent softness of native graphite, compression resilience, adsorptivity, ecological environment harmony, biocompatibility, The characteristics such as radiation resistance.Expanded graphite meet high temperature can 150 ~ 300 times of moment volumetric expansion, vermiform is changed into from sheet, so as to tie Structure is loose, porous and bend, and expanded surface area, surface energy improve, the power enhancing of absorption crystalline flake graphite, can between quasiflake graphite from Row is chimeric, so adds its flexibility, resilience and plasticity.
Nano-silicon nitride:There are α types and β types, relative density 3.18, fusing point:1900 DEG C, have high intensity, high elastic modulus, Low thermal expansion rate, and the characteristic such as excellent heat resistance, electrical insulating property, chemical stability.β types are more steady under the high temperature conditions than α type Qualitative higher, hardness is big, and fiber grows 5~200 μm.It is commonly used for heat-insulating material use.
Yittrium oxide gel:White yellowish powder.Insoluble in ethanol and alkali, acid is dissolved in.Mainly for the manufacture of monocrystalline, yttrium The composite oxides such as iron garnet, yttrium aluminium neodymium garnet, these composite oxides can be used as microwave magnetic since high frequency performance is good The important materials of property material and military communication engineering.It also is used as special refractories.
Aerosil:Its molecular formula is SiO2·H2O has big specific surface area and high hole ratio, in ethanol Property and solvent type adhesive in have good dispersiveness and suspension and thickening, thixotroping, strengthening action.
Crystal whisker of hexa potassium titanate:It is the trade name of fine potassium titanate fibre, has than glass fibre and graphite fibre more Excellent characteristic, has the advantages that the high and good chemical stability of light, low heat conduction, intensity.
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 mullite bulky grain of length, andalusite little particle, Metakaolin superfine powder, bonding clay, expansion stone Ink, flyash, hollow glass micropearl are mixed so that each site component proportioning collocation of adobe of preparation is consistent, ensure that The uniformity of each position performance of corrosion-resistant micro-pore mullite light fire brick of gained is calcined, while contains a large amount of corner angle in raw material Prominent granularity material, increases critical granularity, and firm skeleton structure is provided for corrosion-resistant micro-pore mullite light fire brick It is set to be not likely to produce deformation in use.The adobe is immersed in by the present invention is coagulated by aerosil, yittrium oxide In the high-temperature resistant coating that glue, crystal whisker of hexa potassium titanate, nano-silicon nitride are mixed with so that the adobe surface after firing forms one layer High-temperature-resistant layer, improves the high temperature resistant and surface erosion resistance energy of product.
Meanwhile the present invention makes full use of expanded graphite to be mixed with above-mentioned raw materials so that material internal exists in more time memories A large amount of Minute pores, and the Minute pores will not with the progress of sintering process agglomeration, finally formed in the product micro- Meter level and equally distributed stomata so that the corrosion-resistant micro-pore mullite light fire brick of preparation has high RUL, low creep, height Thermal shock resistance.
Embodiment
Below by embodiment, technical scheme is described in further detail.
Embodiment 1
The present embodiment provides a kind of corrosion-resistant micro-pore mullite light fire brick, it includes refractory brick matrix and coated in described resistance to The high-temperaure coating of firebrick matrix surface;Wherein, the preparing raw material of the refractory brick matrix includes:It is mullite bulky grain 20%, red Pillar little particle 15%, Metakaolin superfine powder 24%, bonding clay 10%, expanded graphite 0.5%, flyash 15%, hollow glass are micro- Pearl 4.5%, pulp-water 11%;The raw material of the high-temperaure coating includes:Aerosil 65%, yittrium oxide gel 15%, six Potassium titanate crystal whisker 1%, nano-silicon nitride 5%, ethanol 14%.
Wherein, the mullite bulky grain particle diameter be the mm of 1 mm~3, the andalusite little particle particle diameter be 0.5 mm~1 Mm, the Metakaolin superfine powder granularity are less than 0.043mm, the hollow glass micropearl length is less than 1mm.Change in each raw material Study point as shown in table 1.
Table 1, each raw material main chemical compositions
The present embodiment also provides a kind of preparation method of the corrosion-resistant micro-pore mullite light fire brick, specific preparation process bag Include:
(1)Calculated according to the raw material of above-mentioned mass percent, mullite bulky grain, andalusite little particle, metakaolin is ultra-fine Powder, bonding clay, expanded graphite, flyash, hollow glass micropearl and pulp-water carry out mixed grind and prefabricated pug are made;By titanium dioxide Silica aerogel, yittrium oxide gel, crystal whisker of hexa potassium titanate, nano-silicon nitride and ethanol are mixed to prepare high-temperature resistant coating;
(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 dried adobe is soaked Stain in the high-temperature resistant coating be made coating adobe, and it is carried out at a temperature of 1350 DEG C calcining 10 it is small when, so as to make Obtain the corrosion-resistant micro-pore mullite light fire brick.After testing, the corrosion-resistant micro-pore mullite is light made from the present embodiment Refractory brick density is 0.85g/cm3
Embodiment 2
The present embodiment provides a kind of corrosion-resistant micro-pore mullite light fire brick, including refractory brick matrix and coated in the fire resisting The high-temperaure coating of brick matrix surface;Wherein, the preparing raw material of the refractory brick matrix:Mullite bulky grain 25%, andalusite are small Particle 15%, Metakaolin superfine powder 15%, bonding clay 5%, expanded graphite 1.5%, flyash 18.5%, hollow glass micropearl 5%, Pulp-water 15%;The preparing raw material of the high-temperaure coating includes:Aerosil 70%, yittrium oxide gel 15%, six metatitanic acids Potassium whisker 3%, nano-silicon nitride 5%, ethanol 7%.
The preparation method of corrosion-resistant micro-pore mullite light fire brick described in the present embodiment and the preparation side in embodiment 1 Method is identical.After testing, the corrosion-resistant micro-pore mullite light fire brick density is 1.1g/cm made from the present embodiment3
Embodiment 3
The present embodiment provides a kind of corrosion-resistant micro-pore mullite light fire brick, its structure includes refractory brick matrix and is coated in The high-temperaure coating of the refractory brick matrix surface;Wherein, the raw material of the refractory brick matrix, which is made, to be included:Mullite bulky grain 28.5%th, andalusite little particle 20%, Metakaolin superfine powder 13%, bonding clay 7%, expanded graphite 1.5%, flyash 15%, sky Heart glass microballoon 5%, pulp-water 10%;The raw material of the high-temperaure coating, which is made, to be included:Aerosil 65%, yittrium oxide Gel 17%, crystal whisker of hexa potassium titanate 3%, nano-silicon nitride 7%, ethanol 8%.
The preparation method of corrosion-resistant micro-pore mullite light fire brick described in the present embodiment and the preparation side in embodiment 1 Method is identical.After testing, the corrosion-resistant micro-pore mullite light fire brick density is 0.9 g/cm made from the present embodiment3
Corrosion-resistant micro-pore mullite light fire brick performance detection
It is bulk density in the corrosion-resistant micro-pore mullite light fire brick prepared respectively to embodiment 1~3, average pore size, resistance to Fiery degree, cold crushing strength and 1350 DEG C of high temperature break resistant intensity performances are detected, and testing result is as shown in table 2.
Table 2, corrosion-resistant micro-pore mullite light fire brick performance detection
As can be seen from the above table:The fire resisting softening point for the corrosion-resistant micro-pore mullite light fire brick that embodiment 1~3 provides is big In 1730 DEG C, cold crushing strength be more than 40MPa, average pore size between 4.5 microns~6.0 microns, bulk density between 0.8 g/cm3~1.1g/cm3Between, therefore the corrosion-resistant micro-pore mullite light fire brick property indices meet GB/ T3994-2013 set quotas, there are equally distributed micron order gas inside the corrosion-resistant micro-pore mullite light fire brick Hole, while the product has the advantages that load softening temperature height, 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 (5)

1. a kind of corrosion-resistant micro-pore mullite light fire brick, it is characterised in that it includes refractory brick matrix and coated in described The high-temperaure coating of refractory brick matrix surface;Wherein, the preparing raw material of the refractory brick matrix includes:Mullite bulky grain 20% ~30%, andalusite little particle 15%~25%, Metakaolin superfine powder 13%~24%, bonding clay 5%~10%, expanded graphite 0.5%~1.5%, flyash 15%~20%, hollow glass micropearl 3%~6%, surplus are pulp-water;The system of the high-temperaure coating Standby raw material includes:Aerosil 65%~70%, yittrium oxide gel 15%~17%, nano-silicon nitride 5%~10%, six metatitanic acids Potassium whisker 1%~3%, ethanol balance are ethanol.
2. corrosion-resistant micro-pore mullite light fire brick according to claim 1, it is characterised in that big of the mullite Grain particle diameter is the mm of 1 mm~3, the andalusite little particle particle diameter is the mm of 0.5 mm~1.
3. corrosion-resistant micro-pore mullite light fire brick according to claim 1 or 2, it is characterised in that the higher ridge The ultra-fine Powder Particle Size of soil is less than 0.043mm, the hollow glass micropearl granularity is less than 1mm.
4. a kind of preparation method of corrosion-resistant micro-pore mullite light fire brick, comprises the following steps:
Calculated according to the raw material of any one of claims 1 to 3 mass percent, by small of mullite bulky grain, andalusite Grain, Metakaolin superfine powder, bonding clay, expanded graphite, flyash, hollow glass micropearl and pulp-water carry out mixed grind and are made pre- Pug processed, adobe and drying are pressed into by the mixed grind pug;
Aerosil, yittrium oxide gel, crystal whisker of hexa potassium titanate, nano-silicon nitride and ethanol are mixed to prepare high temperature resistant to apply The dried adobe, is then immersed in the high-temperature resistant coating and coating adobe is made, the coating adobe is through dry by material The corrosion-resistant micro-pore mullite light fire brick is made after dry, calcining.
5. the preparation method of corrosion-resistant micro-pore mullite light fire brick according to claim 4, it is characterised in that by institute State mixed grind pug and be pressed into adobe, and by the adobe spontaneously dry 24 it is small when, be subsequently placed in dry kiln, 100 DEG C~ When drying 24~48 is small under 200 DEG C of temperature conditionss;Then the dried adobe is immersed in the high-temperature resistant coating Be made coating adobe, and it is 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 institute State corrosion-resistant micro-pore mullite light fire brick.
CN201610897314.5A 2016-10-14 2016-10-14 Corrosion-resistant micro-pore mullite light fire brick and preparation method thereof Withdrawn CN107954745A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109369203A (en) * 2018-12-25 2019-02-22 郑州真金耐火材料有限责任公司 Density mullite brick and preparation method thereof in high intensity
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
CN111646807A (en) * 2020-05-15 2020-09-11 浙江圣奥耐火材料有限公司 Low-heat-conductivity thermal-shock-resistant wear-resistant brick and production process thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109369203A (en) * 2018-12-25 2019-02-22 郑州真金耐火材料有限责任公司 Density mullite brick and preparation method thereof in high intensity
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
CN111646807A (en) * 2020-05-15 2020-09-11 浙江圣奥耐火材料有限公司 Low-heat-conductivity thermal-shock-resistant wear-resistant brick and production process thereof

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