CN116462518A - Low-heat-conductivity refractory brick and preparation method thereof - Google Patents
Low-heat-conductivity refractory brick and preparation method thereof Download PDFInfo
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- CN116462518A CN116462518A CN202310227286.6A CN202310227286A CN116462518A CN 116462518 A CN116462518 A CN 116462518A CN 202310227286 A CN202310227286 A CN 202310227286A CN 116462518 A CN116462518 A CN 116462518A
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- 239000011449 brick Substances 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000010451 perlite Substances 0.000 claims abstract description 21
- 235000019362 perlite Nutrition 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000011707 mineral Substances 0.000 claims abstract description 14
- 239000010881 fly ash Substances 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 11
- 210000002268 wool Anatomy 0.000 claims abstract description 10
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 9
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 9
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 9
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 9
- 239000002689 soil Substances 0.000 claims abstract description 7
- QYEXBYZXHDUPRC-UHFFFAOYSA-N B#[Ti]#B Chemical compound B#[Ti]#B QYEXBYZXHDUPRC-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000004927 clay Substances 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 12
- 238000000465 moulding Methods 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 238000010304 firing Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 229910052906 cristobalite Inorganic materials 0.000 claims description 5
- 239000010453 quartz Substances 0.000 claims description 5
- 229910052851 sillimanite Inorganic materials 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 239000011268 mixed slurry Substances 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 238000005245 sintering Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 abstract description 2
- 230000001788 irregular Effects 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 7
- 230000007547 defect Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3436—Alkaline earth metal silicates, e.g. barium silicate
- C04B2235/3454—Calcium silicates, e.g. wollastonite
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3804—Borides
- C04B2235/3813—Refractory metal borides
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
- C04B2235/9692—Acid, alkali or halogen resistance
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
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Abstract
The invention discloses a low-heat-conductivity refractory brick and a preparation method thereof, and relates to the technical field of refractory brick preparation, wherein the low-heat-conductivity refractory brick comprises the following raw materials in parts by weight: 40-60 parts of mullite, 12-18 parts of white wool clay, 20-30 parts of bauxite chamotte, 30-40 parts of mineral raw materials, 10-15 parts of titanium boride, 15-20 parts of fly ash, 20-30 parts of spherical closed-cell perlite, 8-12 parts of burnable substances, 5-7 parts of green body reinforcing agents, 1-3 parts of water reducing agents and the balance of water; the white wool soil is added in the production process, so that the ceramic-like forming process is facilitated in the sintering process, the normal-temperature compressive strength of the refractory brick is high, and meanwhile, the fly ash and the spherical closed-pore perlite are added, so that a large number of uniformly distributed irregular air holes can be formed in the preparation process of the refractory brick, the low heat conducting performance of the refractory brick is ensured, and the volume density of the refractory brick is reduced.
Description
Technical Field
The invention relates to the technical field of refractory brick preparation, in particular to a low-heat-conductivity refractory brick and a preparation method thereof.
Background
The refractory brick is a building material brick, is a refractory material which is burned by refractory clay or other refractory raw materials, can bear various physical and chemical changes and mechanical actions at high temperature, and often appears in building construction, such as house construction, kiln construction, thermal equipment and the like;
the existing refractory brick is easy to have the defects of high specific gravity and high heat conductivity coefficient, and when the defect is applied to kiln buildings such as boiler walls, the defect is easy to cause poor heat insulation effect of the boiler walls and quick heat dissipation, so that energy waste is caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a low-heat-conductivity refractory brick and a preparation method thereof, and solves the problems of the prior art.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the preparation method of the low-heat-conductivity refractory brick comprises the following steps:
step one: crushing a certain amount of mullite and mineral raw materials, and sieving with a 90-100 mesh sieve to obtain powder for later use;
step two: adding a certain amount of white wool soil, bauxite chamotte and titanium boride into a mixer, mixing and stirring for 10-15min, and then crushing and stirring to obtain a mixture;
sequentially adding the obtained powder and the mixture into a mixer, fully mixing and stirring for 20-30min at the rotating speed of 500-600r/min, sequentially adding the fly ash and the spherical closed-cell perlite during the period, and uniformly stirring to obtain a mixture;
adding the burnable material into the uniformly mixed mixture, adding a certain amount of water, stirring for 5-10min, adding the green body reinforcing agent and the water reducing agent, and continuously stirring for 10-20min until the materials are completely mixed into slurry for later use;
injecting the mixed slurry into a model for molding treatment, standing and curing at room temperature for 24-36h, demolding after standing to obtain a molding die blank, wherein the moisture content of the molding die blank is about 35-38%, and continuously standing for 12-20h after demolding until the moisture content of the molding die blank is about 20-30%;
step six, after the moisture of the formed die blank is reduced to 20% -30%, placing the formed die blank into a drying chamber for drying treatment, and when the moisture of the formed die blank is reduced to 2% -3%;
and step seven, kiln firing the forming die blank obtained in the step six to obtain the low-heat-conductivity refractory brick.
As a further technical scheme of the invention, when the fly ash and the spherical closed-cell perlite are added in the third step, the rotating speed of the mixer is increased to 800-900r/min.
As a further technical scheme of the invention, the drying temperature of the drying chamber in the step six is 90-110 ℃ and the drying time is 24-48h.
As a further technical scheme of the invention, the firing temperature of the kiln in the seventh step is 1600-1700 ℃, after the firing is completed, the cooling temperature is 200 ℃, the heat is preserved for 3-4 hours, and then the kiln is cooled to normal temperature.
The low-heat-conductivity refractory brick comprises the following raw materials in parts by weight: 40-60 parts of mullite, 12-18 parts of white wool clay, 20-30 parts of bauxite chamotte, 30-40 parts of mineral raw materials, 10-15 parts of titanium boride, 15-20 parts of fly ash, 20-30 parts of spherical closed-cell perlite, 8-12 parts of burnable substances, 5-7 parts of green body reinforcing agents, 1-3 parts of water reducing agents and the balance of water.
As a further technical scheme of the invention, the mineral raw materials are divided into the following components in parts by weight: 30-40 parts of blue fine stone, 10-20 parts of quartz, 30-40 parts of cristobalite and 25-35 parts of sillimanite.
As a further technical scheme of the invention, the burnout substances are divided into the following components in parts by weight: 70-90 parts of sawdust and 50-70 parts of carbon powder.
As a further technical scheme of the invention, the heat conductivity coefficient of the spherical closed-cell perlite is 0.047-0.054W/m.k, and the bulk density is 0.09-0.16g/cm 3 。
The invention provides a low-heat-conduction refractory brick and a preparation method thereof, which have the following beneficial effects compared with the prior art:
the invention relates to a low heat conduction refractory brick and a preparation method thereof, which are characterized in that white coarse clay is added in the production process, the ceramic forming process is facilitated in the sintering process, the normal temperature compressive strength of the refractory brick is high, carbon dust and saw dust are used as auxiliary materials, a large number of air holes can be formed in the sintering process, the volume density of the prepared refractory brick is small, the heat conductivity coefficient is low, meanwhile, fly ash and spherical closed-cell perlite are added, and because the spherical closed-cell perlite has the characteristics of uniform particles, low water absorption and easy dispersion, a large number of irregularly distributed air holes can be formed in the preparation process of the refractory brick, the low heat conduction performance of the refractory brick is ensured, the volume density of the refractory brick is reduced.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a low-heat-conductivity refractory brick and a preparation method thereof, and the technical scheme is as follows:
the preparation method of the low-heat-conductivity refractory brick comprises the following steps:
step one: crushing a certain amount of mullite and mineral raw materials, and sieving with a 90-100 mesh sieve to obtain powder for later use;
step two: adding a certain amount of white wool soil, bauxite chamotte and titanium boride into a mixer, mixing and stirring for 10-15min, and then crushing and stirring to obtain a mixture;
sequentially adding the obtained powder and the mixture into a mixer, fully mixing and stirring for 20-30min at the rotating speed of 500-600r/min, sequentially adding the fly ash and the spherical closed-cell perlite during the process, and increasing the rotating speed of the mixer to 800-900r/min when adding, and uniformly stirring to obtain a mixture;
adding the burnable material into the uniformly mixed mixture, adding a certain amount of water, stirring for 5-10min, adding the green body reinforcing agent and the water reducing agent, and continuously stirring for 10-20min until the materials are completely mixed into slurry for later use;
injecting the mixed slurry into a model for molding treatment, standing and curing at room temperature for 24-36h, demolding after standing to obtain a molding die blank, wherein the moisture content of the molding die blank is about 35-38%, and continuously standing for 12-20h after demolding until the moisture content of the molding die blank is about 20-30%;
step six, after the moisture of the formed mould blank is reduced to 20% -30%, placing the formed mould blank into a drying chamber for drying treatment, wherein the drying temperature of the drying chamber is 90-110 ℃, the drying time is 24-48h, and when the moisture of the formed mould blank is reduced to 2-3%;
and step seven, kiln-firing the formed die blank obtained in the step six, wherein the firing temperature is 1600-1700 ℃, after firing, the cooling temperature is 200 ℃, the heat preservation is carried out for 3-4 hours, and the low-heat-conductivity refractory brick is obtained after cooling to normal temperature.
Example 1
According to the technical scheme adopted by the invention, the low-heat-conductivity refractory brick comprises the following raw materials in parts by weight: 50 parts of mullite, 15 parts of white wool soil, 25 parts of bauxite chamotte, 35 parts of mineral raw materials, 12 parts of titanium boride, 17 parts of fly ash, 26 parts of spherical closed-cell perlite, 10 parts of combustible substances, 6 parts of green body reinforcing agent, 2 parts of water reducer and the balance of water;
wherein, the mineral raw materials are divided into: 35 parts of blue fine stone, 15 parts of quartz, 36 parts of cristobalite and 30 parts of sillimanite;
wherein, the burnout substances are divided into parts by weight: 80 parts of sawdust and 60 parts of carbon powder;
further, the spherical closed-cell perlite has a thermal conductivity of 0.047-0.054W/mK and a bulk density of 0.09-0.16g/cm 3 。
Example two
According to the technical scheme adopted by the invention, the low-heat-conductivity refractory brick comprises the following raw materials in parts by weight: 50 parts of mullite, 12 parts of white wool soil, 20 parts of bauxite chamotte, 30 parts of mineral raw materials, 10 parts of titanium boride, 15 parts of fly ash, 20 parts of spherical closed-cell perlite, 8 parts of combustible substances, 5 parts of green body reinforcing agent, 1 part of water reducer and the balance of water;
wherein, the mineral raw materials are divided into: 30 parts of blue fine stone, 10 parts of quartz, 30 parts of cristobalite and 25 parts of sillimanite;
wherein, the burnout substances are divided into parts by weight: 70 parts of sawdust and 50 parts of carbon powder;
further, the spherical closed-cell perlite has a thermal conductivity of 0.047-0.054W/mK and a bulk density of 0.09-0.16g/cm 3 。
Example III
According to the technical scheme adopted by the invention, the low-heat-conductivity refractory brick comprises the following raw materials in parts by weight: 60 parts of mullite, 18 parts of white wool soil, 30 parts of bauxite chamotte, 40 parts of mineral raw materials, 15 parts of titanium boride, 20 parts of fly ash, 30 parts of spherical closed-cell perlite, 12 parts of burnable substances, 7 parts of green body reinforcing agents, 3 parts of water reducing agents and the balance of water;
wherein, the mineral raw materials are divided into: 40 parts of blue fine stone, 20 parts of quartz, 40 parts of cristobalite and 35 parts of sillimanite;
wherein, the burnout substances are divided into parts by weight: 90 parts of sawdust and 70 parts of carbon powder;
further, the spherical closed-cell perlite has a thermal conductivity of 0.047-0.054W/mK and a bulk density of 0.09-0.16g/cm 3 。
Experimental test: the low heat conduction refractory bricks prepared in the first, second and third embodiments of the present invention are detected by the conventional refractory brick detection method commonly used in the market, and the result is as follows:
as can be seen from the results, the low-heat-conductivity refractory brick prepared by the invention reduces the volume density, has low heat conductivity, and the spherical closed-pore perlite is prepared by uniformly expanding the perlite sand with a certain particle diameter from inside to outside after reaching a certain temperature in an electric heating mode, the surface of the expanded particles is molten at a high temperature instantly, the surface tension is overcome to be freely closed, the surface of the particles is formed into continuous vitrified particles after being cooled, the inside of the particles is kept to be complete porous, and the hollow structure has the characteristics of high purity, high simple pressure intensity, uniform particles, low water absorption and easy dispersion, so the preparation process of the invention ensures the low heat conductivity of the refractory brick, and ensures the characteristics of high temperature resistance and difficult deformation.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The preparation method of the low-heat-conductivity refractory brick is characterized by comprising the following steps of:
step one: crushing a certain amount of mullite and mineral raw materials, and sieving with a 90-100 mesh sieve to obtain powder for later use;
step two: adding a certain amount of white wool soil, bauxite chamotte and titanium boride into a mixer, mixing and stirring for 10-15min, and then crushing and stirring to obtain a mixture;
sequentially adding the obtained powder and the mixture into a mixer, fully mixing and stirring for 20-30min at the rotating speed of 500-600r/min, sequentially adding the fly ash and the spherical closed-cell perlite during the period, and uniformly stirring to obtain a mixture;
adding the burnable material into the uniformly mixed mixture, adding a certain amount of water, stirring for 5-10min, adding the green body reinforcing agent and the water reducing agent, and continuously stirring for 10-20min until the materials are completely mixed into slurry for later use;
injecting the mixed slurry into a model for molding treatment, standing and curing at room temperature for 24-36h, demolding after standing to obtain a molding die blank, wherein the moisture content of the molding die blank is about 35-38%, and continuously standing for 12-20h after demolding until the moisture content of the molding die blank is about 20-30%;
step six, after the moisture of the formed die blank is reduced to 20% -30%, placing the formed die blank into a drying chamber for drying treatment, and when the moisture of the formed die blank is reduced to 2% -3%;
and step seven, kiln firing the forming die blank obtained in the step six to obtain the low-heat-conductivity refractory brick.
2. The method for preparing the low-heat-conductivity refractory brick according to claim 1, wherein the rotational speed of a mixer is increased to 800-900r/min when the fly ash and the spherical closed-cell perlite are added in the third step.
3. The method for preparing the refractory brick with low heat conductivity according to claim 1, wherein the drying temperature of the drying chamber in the step six is 90-110 ℃ and the drying time is 24-48h.
4. The method for preparing the refractory brick with low heat conductivity according to claim 1, wherein the firing temperature in the kiln in the seventh step is 1600-1700 ℃, the cooling temperature is 200 ℃ after the firing is completed, the temperature is kept for 3-4 hours, and the refractory brick is cooled to normal temperature.
5. A method for preparing a low thermal conductivity refractory brick according to any one of claims 1 to 4, wherein the raw materials of the low thermal conductivity refractory brick are as follows in parts by weight: 40-60 parts of mullite, 12-18 parts of white wool clay, 20-30 parts of bauxite chamotte, 30-40 parts of mineral raw materials, 10-15 parts of titanium boride, 15-20 parts of fly ash, 20-30 parts of spherical closed-cell perlite, 8-12 parts of burnable substances, 5-7 parts of green body reinforcing agents, 1-3 parts of water reducing agents and the balance of water.
6. The low thermal conductivity refractory brick of claim 5, wherein the mineral raw materials are divided into, by weight: 30-40 parts of blue fine stone, 10-20 parts of quartz, 30-40 parts of cristobalite and 25-35 parts of sillimanite.
7. The low thermal conductivity refractory brick of claim 5, wherein the burnable material is divided into, by weight: 70-90 parts of sawdust and 50-70 parts of carbon powder.
8. The low thermal conductivity refractory brick of claim 5, wherein said spherical closed cell perlite has a thermal conductivity of 0.047-0.054W/m-k and a bulk density of 0.09-0.16g/cm 3 。
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