CN108298995B - Low-dimensional SiO2 high-strength light-weight heat-insulating material and preparation method thereof - Google Patents
Low-dimensional SiO2 high-strength light-weight heat-insulating material and preparation method thereof Download PDFInfo
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Abstract
The invention provides a low-dimensional SiO2A high-strength light-weight heat-insulating material and a preparation method thereof. Taking the silicon dioxide micro powder with the granularity of 300-500 nm and the silicon dioxide micro powder with the granularity of 100-200 nm as main raw materials, CaO-MgO-SiO2Obtaining low-dimensional SiO by using refractory fiber as reinforcing material2The light heat insulating material is prepared through spraying superfine inorganic fiber glue on the surface of the material and low temperature sintering. The side product silicon dioxide micro powder is used as a main raw material, the biomass soluble fiber harmless to human bodies is used as a reinforcing material, the spraying and gluing are arranged on the surface of the green brick, the strength of the green brick is improved, the forming pressure is reduced, the internal porosity of the green brick is increased, and the heat conductivity of the heat-insulating material is reduced; the low-temperature sintering improves the strength of the product, does not change the microporous structure of the heat-insulating material, does not increase the heat conductivity during high-temperature work, prevents the occurrence of moisture absorption and hydration of the heat-insulating brick, and further increases the heat-insulating property.
Description
Technical Field
The invention belongs to the technical field of refractory materials. In particular to low-dimensional SiO2A high-strength light-weight heat-insulating material and a preparation method thereof.
Technical Field
With the continuous consumption of resources, the energy problem becomes more and more obvious, and the requirements of human beings on energy conservation and environmental protection are higher and higher. The refractory material is used as a key material in the high-temperature kiln industry, the heat-conducting property of the refractory material plays a decisive role in energy conservation and emission reduction of the high-temperature industry, and the light heat-insulating refractory material is more significant as a kiln heat-insulating layer.
At present, the light heat-insulating refractory material mainly comprises refractory fiber, calcium silicate boards and the like, the heat conductivity of the refractory fiber and calcium silicate products is low at low temperature (the heat conductivity of the refractory fiber is 0.03W/m.k at normal temperature, and the heat conductivity of the calcium silicate products is 0.06W/m.k), and the heat conductivity of the refractory fiber and the calcium silicate products is higher at high temperature along with the increasing of the temperature (for example, the heat conductivity of the refractory fiber is 0.2W/m.k at 600 ℃, and the heat conductivity of the calcium silicate products is 0.7W/m.k). Therefore, the heat conductivity coefficient of the light heat-insulating material is obviously increased along with the increase of the temperature, and the light heat-insulating material cannot achieve the required heat-insulating effect when being applied in the environment with slightly high temperature.
As is known, when micropores/nanopores are introduced into a material, the micropore structure can effectively reduce the heat conductivity of gas molecules and reduce the convection conduction heat transfer in the material, and the effect is more obvious at high temperature, so that the heat conductivity of the material cannot be greatly improved at higher temperature, and the heat loss at high temperature can be better prevented. Based on the principle, the existing heat-insulating materials are developed to microporous materials in a concentrated way, for example, a heat-insulating felt heat-insulating material prepared from silicon dioxide aerogel and reinforced fibers is widely applied to the field of building materials by effectively reducing the heat conductivity coefficient of the material and enhancing the sound-insulating effect of the material by utilizing the nano-pore structure in the silicon dioxide aerogel, but the adopted silicon dioxide aerogel belongs to synthetic raw materials, the preparation process is complex, the production cost is high, and the application is fresh in the field of refractory materials; for example, the composite heat insulating material prepared by using the nano-pore siliceous powder, the reinforced fiber and other additives improves the heat insulating property of the material by using the nano-pore structure of the siliceous powder, but the material has lower use temperature, for example, the material is usually used at about 600 ℃, the thermal conductivity coefficient at the temperature is about 0.05W/m.k, the material can not be used in higher environment, and the nano-pore siliceous powder is actually prepared by synthesizing the block porous silicon dioxide by a chemical method such as sol-gel and the like. Therefore, the thermal insulation material prepared by adopting the silicon dioxide aerogel, the nano-pore siliceous material and the fiber in the field of refractory materials at present has the problems of complex preparation process and high production cost, and meanwhile, the thermal conductivity coefficient of the thermal insulation material is still high when the thermal insulation material is used in various occasions with high temperature, such as a cement kiln hot air pipeline and the like, so that the requirements of energy conservation and emission reduction can not be completely met.
Disclosure of Invention
In order to solve the above problems, the present invention provides a low dimensional SiO2The high-strength light heat-insulating material takes zero-dimensional silicon dioxide micro powder which is a byproduct of ferrosilicon alloy or metallic silicon smelting as a main raw material, biological soluble fiber as a reinforcing material, and superfine inorganic fiber spray-coated glue as a surface structure reinforcing agent, so that the prepared heat-insulating material has low heat conductivity, and the heat conductivity cannot be increased in the high-temperature use process; the heat-insulating material has high structural strength and can effectively prevent the green bricks from being damaged；
The invention also provides low-dimensional SiO2The method adopts low-temperature firing under the condition of low-pressure forming pressure, so that the prepared heat-insulating material is lighter in weight, the heat-insulating property of the heat-insulating material is obviously improved, and the strength of the heat-insulating material is higher.
The invention is realized by the following technical scheme
Low-dimensional SiO2High-strength light heat-insulating material, low-dimensional SiO2The high-strength light heat-insulating material is prepared from the following raw materials in percentage by weight:
the particle size of the silica micro powder is 300-500 nm: 40-55%;
the particle size of the silica micro powder is 100-200 nm: 30-40%;
CaO-MgO-SiO2refractory fiber: 15-30%.
The low-dimensional SiO2The high-strength light-weight heat-insulating material comprises the following components in both the silica micro powder with the granularity of 300-500 nm and the silica micro powder with the granularity of 100-200 nm: SiO22≥98.5％，C≤0.8％，Al2O3≤0.13％， MgO≤0.16％，CaO≤0.07％，Fe2O3≤0.01％，K2O is less than or equal to 0.33 percent; and are all in amorphous spherical shape.
The low-dimensional SiO2High-strength light heat-insulating material CaO-MgO-SiO2The length of the refractory fiber is 3-5 mm; wherein the mass percentage of CaO is 30.0-35.0%, the mass percentage of MgO is 5.0-8.0%, and SiO2The mass percentage of the component (A) is 57.0-65.0%.
The low-dimensional SiO2The preparation method of the high-strength light heat-insulating material comprises the following steps:
(1) preparing required raw materials: fine silica powder having a particle size of 300 to 500nm, fine silica powder having a particle size of 100 to 200nm, CaO-MgO-SiO2Spraying and gluing refractory fiber and superfine inorganic fiber;
(2) preparing the step (1) according to the required weight percentageThe raw materials of (A) are fine silica powder with a particle size of 300-500 nm, fine silica powder with a particle size of 100-200 nm, and CaO-MgO-SiO2Adding the refractory fiber into a stirrer for mixing, wherein the rotation speed of the stirrer is 10000-;
(3) adding the mixture obtained in the step (2) into a die of a four-column hydraulic press, and respectively pressing the mixture into formed green bricks under the pressure of 2.8-3.5 MPa; then taking out the green brick which is pressed and formed, and uniformly spraying the superfine inorganic fiber spray glue prepared in the step (1) on the surface of the green brick to obtain the green brick with the spray glue on the surface;
(4) placing the green brick with the surface provided with the spray glue in the step (3) in a drying kiln for drying, and after drying is finished; sending the mixture into a low-temperature tunnel kiln for burning, spraying adhesive layer loss after burning, and cooling the mixture to room temperature along with the kiln (cooling the cooling zone of the tunnel kiln) to obtain the low-dimensional SiO2High-strength light heat-insulating material.
The low-dimensional SiO2The preparation method of the high-strength light heat-insulating material comprises the step (3) of spraying the superfine inorganic fiber spray glue on the surface of a green brick to form a layer with the thickness of 0.2-0.5 mm (6 surfaces of the green brick are uniformly sprayed).
The low-micro SiO2The preparation method of the high-strength light heat-insulating material comprises the following steps of (4) drying the green brick with the surface provided with the spray glue in a drying kiln: drying for 5-7 h at the temperature of 90-120 ℃; the firing in the low-temperature tunnel kiln is as follows: and after drying in a drying kiln, entering a low-temperature tunnel kiln, and preserving heat for 0.5-1 hour at the temperature of 800-900 ℃.
Compared with the prior art, the invention has the following positive beneficial effects
The silicon dioxide micropowder adopted by the invention is a ferrosilicon smelting or silicon smelting byproduct as a raw material, so that the waste of the byproduct waste on resources and the influence on the environment are reduced, the production cost is also reduced, the resource recycling is realized, and the effects of energy conservation and emission reduction are achieved;
CaO-MgO-SiO adopted by the invention2Refractory fibre and biological materialThe soluble fiber is used as a reinforcing material, so that the harm to a human body in the production process of the refractory material is avoided. Along with the use of a large amount of heat-insulating refractory materials, a large amount of heat-insulating refractory materials are prepared every year, the materials used in the preparation process all have certain influence on the human body, and especially technicians working in the environment for a long time are greatly influenced;
the superfine inorganic fiber spray coating is sprayed on the surface of the compression-molded fire-resistant green brick, and the coating is sprayed on the surface of the green brick to well protect the green brick, so that the breakage rate of the green brick in the carrying process is obviously reduced, the structural strength of the green brick is greatly improved, and the molding pressure is also reduced, thereby increasing the porosity of the green brick, further reducing the thermal conductivity of the fire-resistant thermal insulation material, and solving the problems of large molding pressure, low strength and high thermal conductivity required by the existing light thermal insulation material; in the preparation process, the green brick coated with the spray coating is sintered at a low temperature of 800-900 ℃, and the inorganic fiber layer sprayed on the surface can be naturally burned out in the sintering process, so that the sprayed superfine inorganic fiber spray coating does not influence the heat preservation effect of the material; meanwhile, in the sintering process, the microporous structure formed by the spherical silicon dioxide nano powder accumulation in the heat insulation material is not changed, and the heat conductivity in high-temperature work is not increased; the low-temperature sintering enables the heat-insulating material body to achieve the effect of primary sintering, further improves the strength of the heat-insulating material, and greatly reduces the damage rate in the transportation and masonry processes; moreover, the active silica micro powder in the heat-insulating material is promoted to be converted into a stable state by low-temperature firing, so that the occurrence of moisture absorption and hydration of the active silica micro powder in the green brick is avoided; moreover, the low-temperature firing process is adopted, so that the prepared insulating brick is lighter, and the insulating property is improved to a certain extent;
the invention takes byproduct silicon dioxide micro powder as main raw material, then takes biomass soluble fiber as reinforcing material, and carries out mixing and pressing to obtain green bricks; then a layer of superfine inorganic fiber spray coating glue is arranged on the surface layer of the green brick; the existence of the spray coating can improve the strength of the green brick, so that the pressing pressure in the preparation process of the green brick can be indirectly reduced, the porosity inside the green brick is indirectly increased, the heat conductivity of the heat-insulating material is further reduced, and the heat-insulating property of the heat-insulating material is improved; the existence of the spray coating increases the strength of the heat-insulating material, greatly reduces the damage to green bricks in the production process, improves the yield and reduces the waste of raw materials; then low-temperature sintering is adopted in the preparation process, so that the heat-insulating material achieves preliminary sintering, the strength of a heat-insulating material product is further improved, the heat-insulating material is prevented from being damaged during masonry construction, the microporous structure in the heat-insulating material is not changed, the heat conductivity is not increased during high-temperature work, the active silica micropowder in the heat-insulating material is converted into a stable state, the occurrence of moisture absorption and hydration of a heat-insulating brick is prevented, the prepared heat-insulating material is lighter in weight, and the heat-insulating performance is further improved.
Drawings
FIG. 1 shows a microstructure of a thermal insulation material prepared according to the present invention;
FIG. 2 shows a product diagram of the thermal insulation material prepared by the present invention.
Detailed Description
The present invention will be described in more detail with reference to the following embodiments, but the present invention is not limited to the embodiments.
Example 1
Low-dimensional SiO2High-strength light heat-insulating material, low-dimensional SiO2The high-strength light heat-insulating material is prepared from the following raw materials in percentage by weight:
the particle size of the silica micro powder is 300-500 nm: 55 percent of
The particle size of the silica micro powder is 100-200 nm: 30 percent of
CaO-MgO-SiO2Refractory fiber: 15 percent;
wherein the silicon dioxide micropowder with the granularity of 300-500 nm and the silicon dioxide micropowder with the granularity of 100-200 nm are bothComprises the following components: SiO22≥98.5％，C≤0.8％，Al2O3≤0.13％，MgO≤0.16％，CaO≤0.07％， Fe2O3≤0.01％，K2O is less than or equal to 0.33 percent; and are all in an amorphous spherical shape;
wherein the CaO-MgO-SiO2The length of the refractory fiber is 3-5 mm; wherein the mass percent of CaO is 30.0%, the mass percent of MgO is 5.0%, and SiO2The mass percentage of (B) is 65.0%.
The above-mentioned low-dimensional SiO2The preparation method of the high-strength light heat-insulating material comprises the following steps:
(1) preparing required raw materials: 55% of fine silica powder having a particle size of 300 to 500nm, 30% of fine silica powder having a particle size of 100 to 200nm, and CaO-MgO-SiO215% of refractory fiber and spraying and gluing superfine inorganic fiber;
(2) preparing raw materials prepared in the step (1): fine silica powder having a particle size of 300 to 500nm, fine silica powder having a particle size of 100 to 200nm, and CaO-MgO-SiO2Adding the refractory fiber into a horizontal stirrer according to the required weight percentage for mixing, wherein the rotating speed of the stirrer is 15000 r/min, and uniformly mixing to obtain a mixed dry material;
(3) adding the mixed dry material obtained in the step (2) into a die of a four-column hydraulic press, and pressing the mixed dry material into a formed green brick under the condition that the pressure is 2.8 MPa; after pressing, automatically demoulding by a hydraulic machine to take out a formed green brick, uniformly spraying the superfine inorganic fiber spraying glue prepared in the step (1) on the surface of the green brick, wherein the spraying thickness is 0.3mm, and obtaining the formed green brick with the superfine inorganic fiber spraying glue on the surface after spraying;
(4) drying the formed green brick with the superfine fiber spray-coated glue on the surface in the step (3) in a drying kiln for 5 hours at the temperature of 100 +/-5 ℃, and after drying is finished; sending the mixture into a low-temperature tunnel kiln, preserving heat for 0.5h at the temperature of 800-900 ℃, spraying adhesive layers to naturally burn out after heat preservation is finished, and cooling the mixture to room temperature along with the kiln to obtain the low-dimensional SiO2High-strength light heat-insulating material. Examining the microstructure of the resulting product, e.g.As shown in fig. 1.
Example 2
Low-dimensional SiO2High-strength light heat-insulating material, low-dimensional SiO2The high-strength light heat-insulating material is prepared from the following raw materials in percentage by weight:
the particle size of the silica micro powder is 300-500 nm: 45 percent of
The particle size of the silica micro powder is 100-200 nm: 30 percent of
CaO-MgO-SiO2Refractory fiber: 25 percent;
wherein the silica micro powder with the granularity of 300-500 nm, namely the silica micro powder with the granularity of 100-200 nm, comprises the following components: SiO22≥98.5％，C≤0.8％，Al2O3≤0.13％，MgO≤0.16％，CaO≤0.07％， Fe2O3≤0.01％，K2O is less than or equal to 0.33 percent; and are all in an amorphous spherical shape;
wherein the CaO-MgO-SiO2The length of the refractory fiber is 3-5 mm; wherein the content of CaO is 35.0%, the content of MgO is 8.0%, and SiO2The content of (B) was 57.0%.
The preparation method of the low-dimensional SiO2 high-strength light-weight heat-insulating material comprises the following steps:
(1) preparing required raw materials: 45% of fine silica powder with a particle size of 300-500 nm, 30% of fine silica powder with a particle size of 100-200 nm, and CaO-MgO-SiO225% of refractory fiber and spraying and gluing superfine inorganic fiber;
(2) preparing raw materials prepared in the step (1): fine silica powder having a particle size of 300 to 500nm, fine silica powder having a particle size of 100 to 200nm, CaO-MgO-SiO2Adding the refractory fiber into a horizontal stirrer according to the required weight percentage for mixing, wherein the rotating speed of the stirrer is 15000 r/min, and uniformly mixing to obtain a mixed dry material;
(3) adding the mixed dry material obtained in the step (2) into a die of a four-column hydraulic press, and pressing the mixed dry material into a formed green brick under the condition that the pressure is 3.5 MPa; after pressing, automatically demoulding by a hydraulic machine to take out a formed green brick, uniformly spraying the superfine inorganic fiber spraying glue prepared in the step (1) on the surface of the green brick, wherein the spraying thickness is 0.5mm, and obtaining the formed green brick with the superfine inorganic fiber spraying glue on the surface after spraying;
(4) drying the formed green brick with the surface provided with the superfine inorganic fiber spray coating glue in the step (3) in a drying kiln for 6 hours at the temperature of 110 +/-5 ℃; after drying, conveying the mixture into a low-temperature tunnel kiln, preserving heat for 0.8h at the temperature of 800-900 ℃, after heat preservation, spraying adhesive layers to naturally burn off, and cooling the mixture to room temperature along with the kiln to obtain the low-dimensional SiO2High-strength light heat-insulating material. The microstructure of the obtained product was examined as shown in FIG. 1.
Example 3
Low-dimensional SiO2High-strength light heat-insulating material, low-dimensional SiO2The high-strength light heat-insulating material is prepared from the following raw materials in percentage by weight:
the particle size of the silica micro powder is 300-500 nm: 40 percent of
The particle size of the silica micro powder is 100-200 nm: 40 percent of
CaO-MgO-SiO2Refractory fiber: 20 percent;
wherein the silica micro powder with the granularity of 300-500 nm, namely the silica micro powder with the granularity of 100-200 nm, comprises the following components: SiO22≥98.5％，C≤0.8％，Al2O3≤0.13％，MgO≤0.16％，CaO≤0.07％， Fe2O3≤0.01％，K2O is less than or equal to 0.33 percent; and are all in an amorphous spherical shape;
wherein the CaO-MgO-SiO2The length of the refractory fiber is 3-5 mm; wherein the content of CaO is 33.0%, the content of MgO is 7.0%, and SiO2The content of (B) is 60.0%.
The above-mentioned low dimensional SiO2The preparation method of the high-strength light heat-insulating material comprises the following steps:
(1) preparing required raw materials: 40% of fine silica powder having a particle size of 300 to 500nm, 40% of fine silica powder having a particle size of 100 to 200nm, and CaO-MgO-SiO2Refractory material20% of fiber, spraying and gluing superfine inorganic fiber;
(2) preparing raw materials prepared in the step (1): fine silica powder having a particle size of 300 to 500nm, fine silica powder having a particle size of 100 to 200nm, CaO-MgO-SiO2Adding the refractory fiber into a horizontal stirrer according to the required weight percentage for mixing, wherein the rotating speed of the stirrer is 15000 r/min, and uniformly mixing to obtain a mixed dry material;
(3) adding the mixed dry material obtained in the step (2) into a die of a four-column hydraulic press, and pressing the mixed dry material into a formed green brick under the condition that the pressure is 3.0 MPa; after pressing, automatically demoulding by a hydraulic machine to take out a formed green brick, uniformly spraying the superfine inorganic fiber spraying glue prepared in the step (1) on the surface of the green brick, wherein the spraying thickness is 0.3mm, and obtaining the formed green brick with the superfine inorganic fiber spraying glue on the surface after spraying;
(4) drying the formed green brick with the surface provided with the superfine inorganic fiber spray coating glue in the step (3) in a drying kiln for 5 hours at the temperature of 120 +/-5 ℃; after drying, conveying the mixture into a low-temperature tunnel kiln, preserving heat for 1h at the temperature of 800-900 ℃, after heat preservation, spraying adhesive layers, naturally burning, and cooling to room temperature along with the kiln to obtain the low-dimensional SiO2High-strength light heat-insulating material. The microstructure of the obtained product was examined as shown in FIG. 1.
FIG. 1a is a microstructure diagram of a product, b is an enlarged view of CaO-MgO-SiO 2-based refractory fibers in the microstructure diagram of the product shown in FIG. 1a, and c is an enlarged view of fine silica powder in the microstructure diagram of the product shown in FIG. 1 a; as can be seen from the figure: the fiber and the silica micropowder interpenetrate in the product, and spherical silica micropowder particles in the heat-insulating material are stacked to form a microporous structure which is basically not changed after low-temperature sintering, so that the microporous structure reduces the convection conduction of heat, further improves the heat-insulating property, and meanwhile, the heat conductivity can not be increased during high-temperature work.
Low dimensional SiO prepared for the above examples 1 to 32The compressive strength and the thermal conductivity coefficient of the high-strength light heat-insulating material at 800 ℃ are detected (according to national standards or industrial standards), and the results are shown in table 1:
TABLE 1 preparation of Low dimensional SiO2Detection result of high-strength light heat-insulating material
According to the detection result, the following results are obtained: the thermal conductivity coefficient of the thermal insulation material prepared by the invention at 800 ℃ is very low, which shows that the thermal insulation material has very good thermal insulation performance at normal use temperature such as 800 ℃ and has very high normal temperature compressive strength.
Application example 4
Low-dimensional SiO2High-strength light heat-insulating material, low-dimensional SiO2The high-strength light heat-insulating material is prepared from the following raw materials in percentage by weight:
the particle size of the silica micro powder is 300-500 nm: 40 percent of
The particle size of the silica micro powder is 100-200 nm: 40 percent of
CaO-MgO-SiO2Refractory fiber: 20 percent;
wherein the silica micro powder with the granularity of 300-500 nm, namely the silica micro powder with the granularity of 100-200 nm, comprises the following components: SiO22≥98.5％，C≤0.8％，Al2O3≤0.13％，MgO≤0.16％，CaO≤0.07％，Fe2O3≤0.01％，K2O is less than or equal to 0.33 percent; and are all in an amorphous spherical shape;
wherein the CaO-MgO-SiO2The length of the refractory fiber is 3-5 mm; wherein the content of CaO is 33.0%, the content of MgO is 7.0%, and SiO2The content of (B) is 60.0%.
The above-mentioned low dimensional SiO2The preparation method of the high-strength light heat-insulating material comprises the following steps:
(1) preparing required raw materials: 40% of fine silica powder having a particle size of 300 to 500nm, 40% of fine silica powder having a particle size of 100 to 200nm, and CaO-MgO-SiO220% of refractory fiber and spraying and gluing superfine inorganic fiber;
(2) Preparing raw materials prepared in the step (1): fine silica powder having a particle size of 300 to 500nm, fine silica powder having a particle size of 100 to 200nm, and CaO-MgO-SiO2Adding the refractory fiber into a horizontal stirrer according to the required weight percentage for mixing, wherein the rotating speed of the stirrer is 15000 r/min, and uniformly mixing to obtain a mixed dry material;
(3) adding the mixed dry material obtained in the step (2) into a die of a four-column hydraulic press, and pressing the mixed dry material into a formed green brick under the condition that the pressure is 3.0 MPa; after pressing, automatically demoulding by a hydraulic machine to take out a formed green brick, uniformly spraying the superfine inorganic fiber spraying glue prepared in the step (1) on the surface of the green brick, wherein the spraying thickness is 0.3mm, and obtaining the formed green brick with the superfine inorganic fiber spraying glue on the surface after spraying;
(4) drying the formed green brick with the surface provided with the superfine inorganic fiber spray coating glue in the step (3) in a drying kiln for 5 hours at the temperature of 110 +/-5 ℃; after drying, conveying the mixture into a low-temperature tunnel kiln, preserving heat for 1h at the temperature of 800-900 ℃, after heat preservation, spraying adhesive layers, naturally burning, and cooling to room temperature along with the kiln to obtain the low-dimensional SiO2High-strength light heat-insulating material.
The dimensions of the molded revolution prepared in this example were 175mm by 140mm by 35mm, as shown in FIG. 2. FIG. 2 shows that the product of the invention has light weight, regular surface, high strength, and can effectively prevent moisture absorption and pulverization and improve the use effect of the product, and slight crisp sound appears in a sintering state when being tapped.
The product is built in a cement kiln tertiary air duct in a cement plant, the measured air duct surface temperature reaches 90 ℃ at least in the working process, and is far lower than the air duct surface temperature 210 ℃ when the traditional silicon mullite brick is used as a heat insulation layer, and the product has a good heat insulation effect. The product is used in cement plants for up to four years without any damage and the reduction of the heat preservation effect.
Namely, the invention prepares the heat-insulating material with outstanding heat-insulating effect and higher strength under the conditions of recycling by-products and adopting harmless soluble fiber; has good social and economic benefits.
Claims (4)
1. Low-dimensional SiO2The high-strength light heat-insulating material is characterized by being prepared from the following raw materials in percentage by weight:
the particle size of the silica micro powder is 300-500 nm: 40 to 55 percent
The particle size of the silica micro powder is 100-200 nm: 30 to 40 percent
CaO-MgO-SiO2Refractory fiber: 15-30%;
the CaO-MgO-SiO2The length of the refractory fiber is 3-5 mm; wherein the mass percentage of CaO is 30.0-35.0%, the mass percentage of MgO is 5.0-8.0%, and SiO2The mass percentage of the component (A) is 57.0-65.0%;
the low-dimensional SiO2The preparation method of the high-strength light heat-insulating material comprises the following steps:
(1) preparing required raw materials: fine silica powder having a particle size of 300 to 500nm, fine silica powder having a particle size of 100 to 200nm, CaO-MgO-SiO2Spraying and gluing refractory fiber and superfine inorganic fiber;
(2) according to the required weight percentage, the raw materials prepared in the step (1) comprise 300-500 nm of fine silicon dioxide powder, 100-200 nm of fine silicon dioxide powder and CaO-MgO-SiO2Adding the refractory fiber into a stirrer for mixing, and uniformly mixing to obtain a mixture;
(3) adding the mixture obtained in the step (2) into a mold, and pressing the mixture into a formed green brick under the pressure of 2.8-3.5 MPa; then taking out the green brick which is pressed and formed, and uniformly spraying the superfine inorganic fiber spray glue prepared in the step (1) on the surface of the green brick to obtain the green brick with the spray glue on the surface;
the thickness of the superfine inorganic fiber spray coating glue sprayed on the surface of the green brick is 0.2-0.5 mm;
(4) placing the green brick with the surface provided with the spray glue in the step (3) in a drying kiln for drying, and after drying is finished; sending the mixture into a low-temperature tunnel kiln for sintering, and cooling the sintered mixture to room temperature along with the kiln to obtain the low-dimensional SiO2High-strength light thermal insulation materialAnd (5) feeding.
2. Low dimensional SiO according to claim 12The high-strength light-weight thermal insulation material is characterized in that the silica micro powder with the granularity of 300-500 nm and the silica micro powder with the granularity of 100-200 nm both comprise the following components: SiO22≥98.5%，C≤0.8%，Al2O3≤0.13%，MgO≤0.16%，CaO≤0.07%，Fe2O3≤0.01%，K2O≤0.33%。
3. Low dimensional SiO according to claim 12The high-strength light-weight thermal insulation material is characterized in that when the mixing is carried out in the stirrer in the step (2), the rotating speed of the stirrer is 10000-.
4. Low dimensional SiO according to claim 12The high-strength light heat-insulating material is characterized in that the drying of the green brick with the surface provided with the spray glue in the step (4) in a drying kiln is as follows: drying for 5-7 h at the temperature of 90-120 ℃; the low-temperature sintering in the tunnel kiln comprises the following steps: and after drying in a drying kiln, entering a low-temperature tunnel kiln, and preserving heat for 0.5-1 hour at the temperature of 800-900 ℃.
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