CN107954726A - Corrosion-resistant mullite firebrick and preparation method thereof - Google Patents

Corrosion-resistant mullite firebrick and preparation method thereof Download PDF

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CN107954726A
CN107954726A CN201610897145.5A CN201610897145A CN107954726A CN 107954726 A CN107954726 A CN 107954726A CN 201610897145 A CN201610897145 A CN 201610897145A CN 107954726 A CN107954726 A CN 107954726A
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corrosion
resistant
mullite
adobe
refractory brick
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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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    • C04B35/01Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/16Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
    • C04B35/18Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
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Abstract

The present invention provides a kind of corrosion-resistant mullite firebrick, 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:Mullite bulky grain 27%~31%, hollow glass micropearl 15%~25%, Metakaolin superfine powder 3%~5%, titanium dioxide 10%~18%, polyvinyl alcohol water solution 0.5%~1.5%, flyash 5%~10%, diatomite 5%~10%, calcium carbonate 6%~11%, surplus are pulp-water;The preparing raw material of the high-temperaure coating includes:Polysiloxanes 20%~35%, PVDF hollow fiber membrane 30%~38%, Mo powder 3%~10%, surplus are ethanol.The present invention also provides a kind of preparation method of corrosion-resistant mullite firebrick, this method step letter nitrogen, be easy to automated production.

Description

Corrosion-resistant mullite firebrick and preparation method thereof
Technical field
The invention belongs to technical field of refractory materials, specifically, relate to a kind of corrosion-resistant mullite firebrick 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 and preferably Heat insulation and preservation effect corrosion-resistant mullite firebrick.
To achieve these goals, the technical solution adopted in the present invention is:A kind of corrosion-resistant mullite firebrick, including Refractory brick matrix and the high-temperaure coating for being sprayed on the refractory brick matrix surface;Wherein, the preparation of the refractory brick matrix is former Material includes:Mullite bulky grain 27%~31%, hollow glass micropearl 15%~25%, Metakaolin superfine powder 3%~5%, titanium dioxide 10%~18%, polyvinyl alcohol water solution 0.5%~1.5%, flyash 5%~10%, diatomite 5%~10%, calcium carbonate 6%~11%, The preparing raw material that surplus obtains the high-temperaure coating for pulp-water includes:Polysiloxanes 20%~35%, PVDF hollow fiber membrane 30%~ 38%th, Mo powder 3%~10%, surplus are ethanol.
Based on above-mentioned, the mullite bulky grain particle diameter is the mm of 1 mm~3, the hollow glass micropearl 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 diatom soil granularity is less than 0.074mm.
The present invention also provides a kind of preparation method of corrosion-resistant mullite firebrick, comprise the following steps:
According to above-mentioned mass percent raw material calculate, by mullite bulky grain, hollow glass micropearl, Metakaolin superfine powder, Titanium dioxide, polyvinyl alcohol water solution, flyash, diatomite, calcium carbonate and pulp-water carry out mixed grind and prefabricated pug are made, by described in Mixed grind pug is pressed into adobe and drying;
High-temperature resistant coating is made in polysiloxanes, PVDF hollow fiber membrane, Mo powder and ethanol, then by the dried adobe surface The high-temperature resistant coating is sprayed, spraying adobe is made, the corrosion-resistant mullite is made after drying, calcining in the spraying adobe Refractory brick.
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 spraying adobe is made, and it is small that calcining 8 is carried out at a temperature of 1100 DEG C~1250 DEG C to it When~10 it is small when so that be made the corrosion-resistant mullite firebrick.
The performance effect of each component is as follows in corrosion-resistant mullite firebrick 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: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.Industrially it is often used as thermal insulation material.Due to porosity Greatly, the features such as absorbability is strong, chemical property is stable, wear-resisting, heat-resisting, can provide excellent surface property, increase-volume, thickening for coating And improve adhesive force.
Calcium carbonate:Calcium carbonate is a kind of inorganic compound, is commonly called as:Lime stone, lime stone, mountain flour.Mainly utilize carbon herein Sour calcium and polyvinyl alcohol water solution are used as pore creating material and sintering aid.
Polysiloxanes, PVDF hollow fiber membrane and Mo powder under the high temperature conditions can cracking reaction generation Mo2C、Mo3The cenotypes such as Si, and Amorphous Si OC ceramic coatings are formed, improve the surface resistance to corrosion of refractory brick, the volumetric expansion of generation can be reduced effectively The porosity on refractory brick surface.
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 mullite bulky grain, hollow glass micropearl, Metakaolin superfine powder, titanium dioxide, the polyvinyl alcohol of length Aqueous solution, flyash, diatomite, calcium carbonate are mixed with pulp-water so that each site component proportioning of adobe of preparation is taken With consistent, the uniformity of each position performance of corrosion-resistant mullite firebrick of calcining gained ensure that, while containing big in raw material The granularity material that corner angle protrude is measured, increases critical granularity, providing firm skeleton structure for corrosion-resistant mullite firebrick makes It is not likely to produce deformation in use.The present invention sprays the adobe by PVDF hollow fiber membrane, polysiloxanes, Mo powder and second In the high-temperature resistant coating that alcohol is mixed with so that the adobe surface after firing forms one layer of refractory ceramics layer, improves product High temperature resistant and surface erosion resistance energy.
Meanwhile the present invention makes full use of polyvinyl alcohol water solution to be mixed with above-mentioned raw materials so that material internal is in more times Inside there are a large amount of Minute pores, and the Minute pores will not with the progress of sintering process agglomeration, finally in the product Form micron order and equally distributed stomata so that the corrosion-resistant mullite firebrick of preparation has high RUL, low creep, highly resistance Thermal shock performance.
Embodiment
Below by embodiment, technical scheme is described in further detail.
Embodiment 1
The present embodiment provides a kind of corrosion-resistant mullite firebrick, including refractory brick matrix and it is sprayed on the refractory brick matrix table The high-temperaure coating in face;Wherein, the preparing raw material of the refractory brick matrix includes:Mullite bulky grain 31%, hollow glass micropearl 18%th, Metakaolin superfine powder 5%, titanium dioxide 13%, polyvinyl alcohol water solution 0.5%, flyash 10%, diatomite 5.5%, calcium carbonate 6%th, pulp-water 11%.The preparing raw material of the high-temperaure coating includes:Polysiloxanes 35%, Mo powder 10%, PVDF hollow fiber membrane 33%, Ethanol 22%.
Wherein, the mullite bulky grain particle diameter be the mm of 1 mm~3, the hollow glass micropearl particle diameter be 0.5 mm~1 Mm, the Metakaolin superfine powder granularity are less than 0.043mm, the diatom soil granularity is less than 0.074mm.Chemistry in each raw material Component is 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 mullite firebrick, and specific preparation process includes:
(1)Calculated according to the raw material of above-mentioned mass percent, mullite bulky grain, hollow glass micropearl, metakaolin is ultra-fine Powder, titanium dioxide, polyvinyl alcohol water solution, flyash, diatomite, calcium carbonate 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 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 brick Base be immersed 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 The corrosion-resistant mullite firebrick is made.After testing, the corrosion-resistant mullite firebrick density is made from the present embodiment 1.9g/cm3
Embodiment 2
The present embodiment provides a kind of corrosion-resistant mullite firebrick, including refractory brick matrix and it 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:Mullite bulky grain 29%, sky Heart glass microballoon 15%, Metakaolin superfine powder 3%, titanium dioxide 18%, polyvinyl alcohol water solution 1.5%, flyash 8.5%, diatomite 8%th, calcium carbonate 6%, pulp-water 11%.The raw material of the high-temperaure coating includes:Polysiloxanes 22%, Mo powder 3%, PVDF hollow fiber membrane 30%th, ethanol 45%.
The preparation method of corrosion-resistant mullite firebrick described in the present embodiment is identical with the preparation method in embodiment 1. After testing, the corrosion-resistant mullite firebrick density is 1.8g/cm made from the present embodiment3
Embodiment 3
The present embodiment provides a kind of corrosion-resistant mullite firebrick, including refractory brick matrix and it is sprayed on the refractory brick matrix table The high-temperaure coating in face;Wherein, the raw material of the refractory brick matrix includes:Mullite bulky grain 28.5%, hollow glass micropearl 15%th, Metakaolin superfine powder 5%, titanium dioxide 9%, polyvinyl alcohol water solution 1.5%, flyash 8%, diatomite 10%, calcium carbonate 11%th, pulp-water 12%;The raw material of the high-temperaure coating includes:Polysiloxanes 35%, Mo powder 10%, PVDF hollow fiber membrane 38%, ethanol 17%。
The preparation method of corrosion-resistant mullite firebrick described in the present embodiment and the preparation in embodiment 1
Method is identical.After testing, the corrosion-resistant mullite firebrick density is 2.1g/cm made from the present embodiment3
Corrosion-resistant mullite firebrick performance detection
Bulk density, average pore size in the corrosion-resistant mullite firebrick prepared respectively to embodiment 1~3, refractoriness, room temperature 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, corrosion-resistant mullite firebrick performance detection
As can be seen from the above table:The fire resisting softening point for the corrosion-resistant mullite firebrick that embodiment 1~3 provides is more than 1690 DEG C, cold crushing strength be more than 38MPa, average pore size between 8.5 microns~10.0 microns, bulk density is between 1.8 g/ cm3~2.2g/cm3Between, therefore the corrosion-resistant mullite firebrick property indices meet GB/T3994-2013 regulations Index, there are equally distributed micron order stomata inside the corrosion-resistant mullite firebrick, 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 (5)

1. a kind of corrosion-resistant mullite firebrick, it is characterised in that it includes refractory brick matrix and is sprayed on the refractory brick base The high-temperaure coating in body surface face;Wherein, the preparing raw material of the refractory brick matrix includes:Mullite bulky grain 27%~31%, sky Heart glass microballoon 15%~25%, Metakaolin superfine powder 3%~5%, titanium dioxide 10%~18%, polyvinyl alcohol water solution 0.5%~ 1.5%th, flyash 5%~10%, diatomite 5%~10%, calcium carbonate 6%~11%, surplus are pulp-water;The high-temperaure coating Preparing raw material includes:Polysiloxanes 20%~35%, PVDF hollow fiber membrane 30%~38%, Mo powder 3%~10%, surplus are ethanol.
2. corrosion-resistant mullite firebrick according to claim 1, it is characterised in that the mullite bulky grain particle diameter is The mm of 1 mm~3, the hollow glass micropearl particle diameter are the mm of 0.5 mm~1.
3. corrosion-resistant mullite firebrick according to claim 1 or 2, it is characterised in that the Metakaolin superfine powder Granularity is less than 0.043mm, the diatom soil granularity is less than 0.074mm.
4. a kind of preparation method of corrosion-resistant mullite firebrick, comprises the following steps:
Calculated according to the raw material of any one of claims 1 to 3 mass percent, mullite bulky grain, hollow glass is micro- Pearl, Metakaolin superfine powder, titanium dioxide, polyvinyl alcohol water solution, flyash, diatomite, calcium carbonate and pulp-water carry out mixed grind Prefabricated pug is made, the mixed grind pug is pressed into adobe and drying;
High-temperature resistant coating is made in polysiloxanes, PVDF hollow fiber membrane, Mo powder and ethanol, then by the dried adobe surface The high-temperature resistant coating is sprayed, spraying adobe is made, the corrosion-resistant mullite is made after drying, calcining in the spraying adobe Refractory brick.
5. the preparation method of corrosion-resistant mullite firebrick according to claim 4, it is characterised in that by the mixed grind mud Material is pressed into adobe, and the adobe is placed in dry kiln when natural drying 24 is small, in 100 DEG C~200 DEG C of temperature Under the conditions of 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 is made 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 it is described it is corrosion-resistant not Carry out stone refractory brick.
CN201610897145.5A 2016-10-14 2016-10-14 Corrosion-resistant mullite firebrick and preparation method thereof Withdrawn CN107954726A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110204322A (en) * 2019-05-15 2019-09-06 唐山市凯伦保温材料有限公司 A kind of mullite insulating fire brick and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110204322A (en) * 2019-05-15 2019-09-06 唐山市凯伦保温材料有限公司 A kind of mullite insulating fire brick and preparation method thereof
CN110204322B (en) * 2019-05-15 2021-07-27 唐山市凯伦保温材料有限公司 Mullite heat-insulating refractory brick and preparation method thereof

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Application publication date: 20180424