CN107954700A - Corrosion-resistant corundum refractory brick and preparation method thereof - Google Patents

Corrosion-resistant corundum refractory brick and preparation method thereof Download PDF

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Publication number
CN107954700A
CN107954700A CN201610897317.9A CN201610897317A CN107954700A CN 107954700 A CN107954700 A CN 107954700A CN 201610897317 A CN201610897317 A CN 201610897317A CN 107954700 A CN107954700 A CN 107954700A
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refractory brick
corrosion
resistant
adobe
powder
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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 corundum refractory brick, it includes refractory brick matrix and is sprayed on the high-temperaure coating of the refractory brick matrix surface;Wherein, the preparing raw material of the refractory brick matrix includes:Corundum fine powder 27%~31%, andalusite bulky grain 15%~25%, Metakaolin superfine powder 3%~5%, titanium dioxide 10%~18%, carboxymethyl cellulose 0.5%~1.5%, flyash 5%~10%, diatomite 5%~10%, aerosil 6%~11%, surplus are pulp-water;The preparing raw material of the high-temperaure coating includes:Polysiloxanes 55%~68%, Mo powder 3%~10%, surplus are ethanol.The present invention also provides a kind of preparation method of corrosion-resistant corundum refractory brick, this method step is simple, is easy to automated production.

Description

Corrosion-resistant corundum refractory brick and preparation method thereof
Technical field
The invention belongs to technical field of refractory materials, specifically, relate to a kind of corrosion-resistant corundum refractory brick and its system 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 corrosion-resistant corundum refractory brick.
To achieve these goals, the technical solution adopted in the present invention is:A kind of corrosion-resistant corundum refractory brick, including it is resistance to Firebrick matrix and the high-temperaure coating for being sprayed on the refractory brick matrix surface;Wherein, the preparing raw material of the refractory brick matrix Including:Corundum fine powder 27%~31%, andalusite bulky grain 15%~
25%th, Metakaolin superfine powder 3%~5%, titanium dioxide 10%~18%, carboxymethyl cellulose 0.5%~1.5%, flyash 5%~ 10%th, diatomite 5%~10%, aerosil 6%~11%, surplus are pulp-water;The preparing raw material of the high-temperaure coating Including:Polysiloxanes 55%~68%, Mo powder 3%~10%, surplus are ethanol.
Based on above-mentioned, the corundum fine powder granularity is less than 0.074mm, the andalusite bulky grain particle diameter is 1 mm~3 mm。
Based on above-mentioned, the Metakaolin superfine powder granularity is less than 0.043mm, the diatom soil granularity is less than 0.074mm.
The present invention also provides a kind of preparation method of corrosion-resistant corundum refractory brick, comprise the following steps:
Raw material according to above-mentioned mass percent is weighed calculates, by corundum fine powder, andalusite bulky grain, Metakaolin superfine powder, titanium White powder, carboxymethyl cellulose, flyash, diatomite, aerosil and pulp-water carry out mixed grind and prefabricated pug are made, will The mixed grind pug is pressed into adobe and drying;
Polysiloxanes, Mo powder and ethanol are mixed to prepare high-temperature resistant coating, then by the dried adobe surface spraying institute High-temperature resistant coating is stated, spraying adobe is made, the corrosion-resistant corundum refractory brick is made after drying, calcining in the spraying adobe.
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, when drying 24~48 is small under 100 DEG C~200 DEG C of temperature conditionss;Then the dried adobe is impregnated In the high-temperature resistant coating be made spraying adobe, and it is carried out at a temperature of 1100 DEG C~1250 DEG C calcining 8 it is small when~ 10 it is small when so that be made the corrosion-resistant corundum refractory brick.
The performance effect of each component is as follows in corrosion-resistant corundum refractory brick raw material provided by the present invention:
Corundum fine powder:Main component is aluminium oxide, is a kind of compound of high rigidity, and fusing point is 2054 DEG C, and boiling point is 2980 DEG C, Due to there is the performance such as high temperature resistant, corrosion-resistant, high intensity, therefore slide gate nozzle is can be used as, smelt rare precious metal, special alloy, high-purity Metal, glass spinning, the crucible and vessel for making laser glass;Various High-temp. kilns, such as refractory material, ceramics, blast furnace Liner.
Andalusite:Crystal belongs to orthogonal(Rectangle)The nesosilicate mineral of crystallographic system, andalusite is in adobe calcination process It is middle irreversible crystal transformation occur to form the mullite with good mullite network, thus make it have 1800 DEG C with On 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 have High chemical stability and extremely strong resistance to chemical corrosion, so that the low creep andalusite composite refractory brick prepared With 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.
Titanium dioxide:Main component is titanium dioxide, and chemical property is extremely stablized, and is a kind of amphoteric oxide of slant acidity, It is widely used in all kinds of body structure surface coating, paper coating and fillers, plastics and elasticity.It is mainly as sintering aid herein, Reduce the sintering temperature of refractory brick.
Diatomite:Diatomite is a kind of siliceous rock, is a kind of biogenic siliceous sedimentary rock, it is mainly by ancient times silicon The remains of algae are formed.Its chemical composition is with SiO2Based on.Thermal insulation material industrially is often used as, simultaneously because having hole The features such as degree is big, absorbability is strong, chemical property is stable, wear-resisting, heat-resisting, can provide excellent surface property, increase-volume, increases for coating Thick and raising adhesive force.
Carboxymethyl cellulose:Native cellulose is that the polysaccharide most wide, content is most is distributed in nature, and source is very rich It is rich.The modification technology of current fibre element is concentrated mainly on etherificate and the aspect of esterification two.Carboxymethylation reaction is the one of etherification technology Kind.Cellulose obtains carboxymethyl cellulose after carboxy methylation(CMC), its aqueous solution is with thickening, film forming, gluing, moisture guarantor Hold, colloid protection, emulsification and suspend etc. effect.Carboxymethyl cellulose high temperature thermal decomposition herein can be used as pore former.
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.
Polysiloxanes under the high temperature conditions can cracking reaction generation Mo with Mo powder2C、Mo3The cenotypes such as Si, and amorphous can be formed State SiOC ceramic coatings, improve the surface resistance to corrosion of refractory brick, and the volumetric expansion of generation can effectively reduce refractory brick table The porosity in face.
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 the corundum fine powder of different grain size and length, andalusite bulky grain, Metakaolin superfine powder, titanium dioxide, carboxymethyl cellulose, Flyash, diatomite, aerosil and pulp-water are mixed so that each site component proportioning of adobe of preparation is taken With consistent, the uniformity of each position performance of corrosion-resistant corundum refractory brick of calcining gained ensure that, while containing a large amount of in raw material Corner angle protrude granularity material, increase critical granularity, for corrosion-resistant corundum refractory brick provide firm skeleton structure make its Deformation is not likely to produce during use.Adobe spraying is mixed with resistance to by the present invention by polysiloxanes, Mo powder and ethanol In high-temperature coatings so that the adobe surface after firing forms one layer of refractory ceramics layer, improves high temperature resistant and the surface of product Corrosion resistance.
Meanwhile the present invention makes full use of carboxymethyl cellulose to be mixed with above-mentioned raw materials so that material internal is within more times There are a large amount of Minute pores, and the Minute pores will not with the progress of sintering process agglomeration, finally shape in the product Into micron order and equally distributed stomata so that the corrosion-resistant corundum refractory brick of preparation has high RUL, low creep, highly heatproof and shockproof Performance.
Embodiment
Below by embodiment, technical scheme is described in further detail.
Embodiment 1
The present embodiment provides a kind of corrosion-resistant corundum refractory brick, it includes refractory brick matrix and is sprayed on the refractory brick matrix table The high-temperaure coating in face;Wherein, the raw material of the refractory brick matrix includes:It is corundum fine powder 31%, andalusite bulky grain 15%, higher Ridge soil superfine powder 5%, titanium dioxide 10%, carboxymethyl cellulose 0.5%, flyash 10%, diatomite 5.5%, aerosil 6%th, pulp-water 17%.The raw material of the high-temperaure coating includes:Polysiloxanes 60%, Mo powder 10%, ethanol 30%.
Wherein, the corundum fine powder granularity is less than 0.074mm, the andalusite bulky grain particle diameter is the mm of 1 mm~3, institute State Metakaolin superfine powder granularity and be less than 0.074mm less than 0.043mm, the diatom soil granularity.Chemical composition in each raw material 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 corundum refractory brick, and specific preparation process includes:
(1)Calculated according to the raw material of above-mentioned mass percent, by corundum fine powder, andalusite bulky grain, Metakaolin superfine powder, titanium White powder, carboxymethyl cellulose, flyash, diatomite, aerosil and pulp-water carry out mixed grind and prefabricated pug are made;Will High-temperature resistant coating is made with ethanol in polysiloxanes Mo powder;
(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 Be placed on when so dry 24 is small in dry kiln, under 200 DEG C of temperature conditionss it is dry 24 it is small when after dried adobe is impregnated In the high-temperature resistant coating be made spraying adobe, and it is carried out at a temperature of 1250 DEG C calcining 8 it is small when so that be made institute State corrosion-resistant corundum refractory brick.After testing, the corrosion-resistant corundum refractory brick density is 1.6g/cm made from the present embodiment3
Embodiment 2
The present embodiment provides a kind of corrosion-resistant corundum refractory brick, it includes refractory brick matrix and is sprayed on the refractory brick matrix table The high-temperaure coating in face;Wherein, the refractory brick matrix includes the material of following mass percents:Corundum fine powder 27%, andalusite Bulky grain 16%, Metakaolin superfine powder 5%, titanium dioxide 12%, carboxymethyl cellulose 1.5%, flyash 8.5%, diatomite 5%, two Silica aerogel 11%, pulp-water 14%.The raw material of the high-temperaure coating includes:Polysiloxanes 68%, Mo powder 5%, ethanol 27%。
The preparation method of corrosion-resistant corundum refractory brick described in the present embodiment is identical with the preparation method in embodiment 1.Through Detection, the corrosion-resistant corundum refractory brick density made from the present embodiment is 2.1g/cm3
Embodiment 3
The present embodiment provides a kind of corrosion-resistant corundum refractory brick, it includes refractory brick matrix and is sprayed on the refractory brick matrix table The high-temperaure coating in face;Wherein, the raw material of the refractory brick matrix includes:Corundum fine powder 28.5%, andalusite bulky grain 20%, partially Kaolin superfine powder 3%, titanium dioxide 11%, carboxymethyl cellulose 1.5%, flyash 8%, diatomite 8%, aerosil 8%, Pulp-water 12%;The raw material of the high-temperaure coating includes:Polysiloxanes 68%, Mo powder 9%, ethanol 23%.
The preparation method of corrosion-resistant corundum refractory brick described in the present embodiment is identical with the preparation method in embodiment 1.Through Detection, the corrosion-resistant corundum refractory brick density made from the present embodiment is 1.8g/cm3
Corrosion-resistant corundum refractory brick performance detection
Bulk density, average pore size in the corrosion-resistant corundum refractory brick prepared respectively to embodiment 1~3, refractoriness, room temperature are resistance to Compressive 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 corundum refractory brick performance detection
As can be seen from the above table:Embodiment 1~3 provide corrosion-resistant corundum refractory brick fire resisting softening point be more than 1700 DEG C, Cold crushing strength be more than 35MPa, average pore size between 8.5 microns~10.0 microns, bulk density is between 1.5 g/cm3 ~2.2g/cm3Between, therefore the corrosion-resistant corundum refractory brick property indices meet finger as defined in GB/T3994-2013 Mark, there are equally distributed micron order stomata inside the corrosion-resistant corundum refractory brick, while the product has load softening temperature The advantages of degree 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 (5)

1. a kind of corrosion-resistant corundum refractory brick, it is characterised in that it includes refractory brick matrix and is sprayed on the refractory brick matrix The high-temperaure coating on surface;Wherein, the preparing raw material of the refractory brick matrix includes:Corundum fine powder 27%~31%, andalusite are big Particle 15%~25%, Metakaolin superfine powder 3%~5%, titanium dioxide 10%~18%, carboxymethyl cellulose 0.5%~1.5%, fine coal Ash 5%~10%, diatomite 5%~10%, aerosil 6%~11%, surplus are pulp-water;The system of the high-temperaure coating Standby raw material includes:Polysiloxanes 55%~68%, Mo powder 3%~10%, surplus are ethanol.
2. corrosion-resistant corundum refractory brick according to claim 1, it is characterised in that the corundum fine powder granularity is less than 0.074mm, the andalusite bulky grain particle diameter are the mm of 1 mm~3.
3. corrosion-resistant corundum refractory brick according to claim 1 or 2, it is characterised in that the Metakaolin superfine powder grain Degree is less than 0.074mm less than 0.043mm, the diatom soil granularity.
4. a kind of preparation method of corrosion-resistant corundum refractory brick, comprises the following steps:
According to any one of claims 1 to 3 mass percent raw material calculate, by corundum fine powder, andalusite bulky grain, partially Kaolin superfine powder, titanium dioxide, carboxymethyl cellulose, flyash, diatomite, aerosil and pulp-water carry out mixed grind Prefabricated pug is made, the mixed grind pug is pressed into adobe and drying;
Polysiloxanes, Mo powder and ethanol are mixed to prepare high-temperature resistant coating, then by the dried adobe surface spraying institute High-temperature resistant coating is stated, spraying adobe is made, the corrosion-resistant corundum refractory brick is made after drying, calcining in the spraying adobe.
5. the preparation method of corrosion-resistant corundum refractory brick according to claim 4, it is characterised in that by the mixed grind pug Adobe is pressed into, and the adobe is placed in dry kiln when natural drying 24 is small, in 100 DEG C~200 DEG C of temperature strip Under part it is dry 24 it is small when~48 it is small when;Then the dried adobe is immersed in the high-temperature resistant coating and spraying brick is made Base, and it is carried out at a temperature of 1100 DEG C~1250 DEG C calcining 8 it is small when~10 it is small when so that be made the corrosion-resistant corundum Refractory brick.
CN201610897317.9A 2016-10-14 2016-10-14 Corrosion-resistant corundum refractory brick and preparation method thereof Withdrawn CN107954700A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108840659A (en) * 2018-07-31 2018-11-20 合肥铭佑高温技术有限公司 A kind of corrosion-resistant light fire brick and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108840659A (en) * 2018-07-31 2018-11-20 合肥铭佑高温技术有限公司 A kind of corrosion-resistant light fire brick and preparation method thereof

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