CN116462518A - Low-heat-conductivity refractory brick and preparation method thereof - Google Patents

Low-heat-conductivity refractory brick and preparation method thereof Download PDF

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Publication number
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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refractory brick
low
heat
raw materials
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张姗
董舜杰
蒋杰
万志华
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Anhui Ruitai New Material Technology Co ltd
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Anhui Ruitai New Material Technology Co ltd
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    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3427Silicates other than clay, e.g. water glass
    • C04B2235/3436Alkaline earth metal silicates, e.g. barium silicate
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    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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    • C04B2235/34Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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    • C04B2235/3804Borides
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    • YGENERAL 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
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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

Low-heat-conductivity refractory brick and preparation method thereof
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
CN202310227286.6A 2023-03-10 2023-03-10 Low-heat-conductivity refractory brick and preparation method thereof Pending CN116462518A (en)

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GB1478904A (en) * 1973-08-02 1977-07-06 Otavi Minen Und Eisenbahn Ges Ceramic insulating bricks
CN101362648A (en) * 2007-08-07 2009-02-11 徐进清 Mullite fire resistant insulation products and preparation method thereof
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