CN114014691A - High-alumina heat-insulating brick and preparation method thereof - Google Patents
High-alumina heat-insulating brick and preparation method thereof Download PDFInfo
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- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
- C04B38/063—Preparing or treating the raw materials individually or as batches
- C04B38/0635—Compounding ingredients
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- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped 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 aluminium oxide
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- 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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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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Abstract
The invention relates to a high-alumina heat insulation brick and a preparation method thereof, comprising the following steps: (1) uniformly mixing 38.5-56.4 parts of lightweight alumina aggregate, 23.4-41.7 parts of high-alumina clinker, 6.4-13.8 parts of aluminate cement, 8.7-12.6 parts of starch and 2.7-6.5 parts of silicon dioxide micropowder; (2) then adding 0.08-0.15 part of water reducing agent and 15.4-24.5 parts of water, mixing, and casting and molding; (3) curing for 24-48 h at room temperature, demolding, and drying for 24-36 h at 100-120 ℃; (4) sintering at 1380-1570 ℃, and keeping the temperature for 3-5 hours to obtain the high-aluminum heat-insulating brick. The invention takes the sawdust as the filler, the mixture of the starch and the water can generate good viscosity, the aggregate and the sawdust are well bonded, the filler, the sawdust, of the manufactured green body is burnt in the production process when the green body is burnt, and a uniform pore structure is generated in the brick body, thus obtaining the light heat-insulating brick. And in the sintering process, toxic gas containing benzene is not generated, and the method is environment-friendly.
Description
Technical Field
The invention belongs to the technical field of refractory bricks, and particularly relates to a high-alumina heat-insulating brick and a preparation method thereof.
Background
The heat insulation brick is a heat insulation product with a regular shape. Belongs to a light heat-insulating refractory material. The materials have the common characteristics of small volume density, light volume weight and low heat conductivity coefficient. But has lower strength, larger high-temperature re-burning shrinkage and good heat insulation and moisture retention effects.
At present, the existing light heat insulation brick mainly takes fire clay as a main raw material, organic materials are added as fillers, then polystyrene balls and the organic materials are mixed according to a certain proportion to form the organic fillers, the organic fillers can be burnt off in the production process of the heat insulation brick, and a pore structure is formed in a brick body, so that the density of the heat insulation brick body is reduced.
In the conventional production method, a large amount of toxic gas containing benzene is formed due to the combustion of the polystyrene spheres in the production process, so that the environmental pollution is caused.
Disclosure of Invention
The invention aims to provide a preparation method of an environment-friendly high-alumina heat-insulating brick aiming at the defects of the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high-alumina insulating brick is prepared by the following steps:
(1) uniformly mixing 38.5-56.4 parts of lightweight alumina aggregate, 23.4-41.7 parts of high-alumina clinker, 6.4-13.8 parts of aluminate cement, 8.7-12.6 parts of starch and 2.7-6.5 parts of silicon dioxide micropowder;
(2) then adding 0.08-0.15 part of water reducing agent and 15.4-24.5 parts of water, mixing, and casting and molding;
(3) curing for 24-48 h at room temperature, demolding, and drying for 24-36 h at 100-120 ℃;
(4) sintering at 1380-1570 ℃, and keeping the temperature for 3-5 hours to obtain the high-aluminum heat-insulating brick.
The lightweight alumina aggregate is prepared by the following preparation method:
taking 84.3-93.5 parts of bauxite powder and 6.5-16.3 parts of bauxite powder as raw materials, adding 1.2-3.3 parts of sawdust, uniformly mixing, preparing into granular particles, and naturally drying;
and (3) baking the naturally dried granular particles for 24-36 hours at the temperature of 100-120 ℃, then heating to 1450-1570 ℃, and preserving heat for 6-12 hours to obtain the lightweight alumina aggregate.
Al of the alumina powder2O3The content is 46.7-72.3 parts, and the particle size of the bauxite powder is less than or equal to 0.074 mm.
Al of the alumina powder2O3The content is more than or equal to 65wt percent, and the particle size of the bauxite powder is less than or equal to 0.074 mm.
The water reducing agent is prepared by mixing sodium tripolyphosphate and melamine formaldehyde resin according to a mass ratio of 2: 1.
Due to the adoption of the technical scheme, the invention has the following positive beneficial effects:
the invention takes the sawdust as the filler, the mixture of the starch and the water can generate good viscosity, the aggregate and the sawdust are well bonded, the filler, the sawdust, of the manufactured green body is burnt in the production process when the green body is burnt, and a uniform pore structure is generated in the brick body, thus obtaining the light heat-insulating brick. And in the sintering process, toxic gas containing benzene is not generated, and the method is environment-friendly.
Detailed Description
The invention is further described with reference to specific embodiments, without limiting its scope.
In this embodiment:
al of the alumina powder2O3The content is 46.7-72.3 parts, and the particle size of the bauxite powder is less than or equal to 0.074 mm.
Al of the alumina powder2O3The content is more than or equal to 65wt percent, and the particle size of the bauxite powder is less than or equal to 0.074 mm.
The water reducing agent is prepared by mixing sodium tripolyphosphate and melamine formaldehyde resin according to a mass ratio of 2: 1.
Example 1
A high-alumina insulating brick is prepared by the following steps:
(1) uniformly mixing 38.5 parts of lightweight alumina aggregate, 33.4 parts of high-alumina clinker, 10.4 parts of aluminate cement, 12.6 parts of starch and 4.7 parts of silicon dioxide micropowder;
(2) then 0.08 part of water reducing agent and 17.5 parts of water are added, mixed and cast for molding;
(3) curing for 48h at room temperature, demolding, and drying for 24h at 120 ℃;
(4) sintering at 1570 ℃, and keeping the temperature for 3h to obtain the high-alumina heat-insulating brick.
The lightweight alumina aggregate is prepared by the following preparation method:
taking 85.5 parts of bauxite powder and 9.3 parts of bauxite powder as raw materials, adding 3.3 parts of sawdust, uniformly mixing, preparing into granular particles, and naturally drying;
and (3) baking the naturally dried granular particles at 120 ℃ for 30 hours, heating to 1450 ℃, and preserving heat for 6 hours to obtain the lightweight alumina aggregate.
Example 2
A high-alumina insulating brick is prepared by the following steps:
(1) uniformly mixing 39.4 parts of lightweight alumina aggregate, 32.7 parts of high-alumina clinker, 7.8 parts of aluminate cement, 11.6 parts of starch and 6.5 parts of silicon dioxide micropowder;
(2) then 0.12 part of water reducing agent and 24.5 parts of water are added, mixed and cast for molding;
(3) curing for 48h at room temperature, demolding, and drying for 24h at 120 ℃;
(4) sintering at 1450 deg.C, and keeping the temperature for 4h to obtain the high-alumina heat-insulating brick.
The lightweight alumina aggregate is prepared by the following preparation method:
taking 88.4 parts of bauxite powder and 14.3 parts of bauxite powder as raw materials, adding 2.3 parts of sawdust, uniformly mixing, preparing into granular particles, and naturally drying;
and (3) baking the naturally dried granular particles at 100 ℃ for 36 hours, then heating to 1570 ℃, and preserving heat for 6 hours to obtain the lightweight alumina aggregate.
Example 3
A high-alumina insulating brick is prepared by the following steps:
(1) uniformly mixing 52.4 parts of lightweight alumina aggregate, 40.7 parts of high-alumina clinker, 12.7 parts of aluminate cement, 11.2 parts of starch and 3.4 parts of silicon dioxide micropowder;
(2) then 0.15 part of water reducing agent and 22.4 parts of water are added, mixed and cast for molding;
(3) curing at room temperature for 244h, demolding, and drying at 4120 deg.C for 244 h;
(4) sintering at 13804 ℃ and keeping the temperature for 45 hours to obtain the high-alumina heat-insulating brick.
The lightweight alumina aggregate is prepared by the following preparation method:
taking 85.5 parts of bauxite powder and 416.3 parts of bauxite powder as raw materials, adding 2.7 parts of sawdust, uniformly mixing, preparing into granular particles, and naturally drying;
and (3) baking the naturally dried granular particles for 24 hours at the temperature of 7120 ℃, then heating to 1570 ℃, and preserving the heat for 67 hours to obtain the lightweight alumina aggregate.
50 groups of the products obtained in examples 1 to 3 were subjected to performance tests. The specific test results are shown in table 1 below:
TABLE 1
| Test items | Density of | Compressive strength | Thermal conductivity | Rate of change of reburning line |
| Example 1 | 1.42g/cm3 | 20～35MPa | 0.2～0.4W/(m·K) | ±0.4％ |
| Example 2 | 1.50g/cm3 | 25～35MPa | 0.2～0.4W/(m·K) | ±0.4％ |
| Example 3 | 1.60g/cm3 | 20～35MPa | 0.2～0.4W/(m·K) | ±0.4％ |
The test data show that the high-alumina heat-insulating brick obtained by the invention has the advantages of small density, small heat conductivity coefficient, strong thermal shock stability and high compressive strength.
While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
Claims (6)
1. The preparation method of the high-alumina heat insulation brick is characterized by comprising the following steps:
(1) uniformly mixing 38.5-56.4 parts of lightweight alumina aggregate, 23.4-41.7 parts of high-alumina clinker, 6.4-13.8 parts of aluminate cement, 8.7-12.6 parts of starch and 2.7-6.5 parts of silicon dioxide micropowder;
(2) then adding 0.08-0.15 part of water reducing agent and 15.4-24.5 parts of water, mixing, and casting and molding;
(3) curing for 24-48 h at room temperature, demolding, and drying for 24-36 h at 100-120 ℃;
(4) sintering at 1380-1570 ℃, and keeping the temperature for 3-5 hours to obtain the high-aluminum heat-insulating brick.
2. The method for preparing a high alumina heat insulating brick as claimed in claim 1, wherein the lightweight alumina aggregate is prepared by the following preparation method:
taking 84.3-93.5 parts of bauxite powder and 6.5-16.3 parts of bauxite powder as raw materials, adding 1.2-3.3 parts of sawdust, uniformly mixing, preparing into granular particles, and naturally drying;
and (3) baking the naturally dried granular particles for 24-36 hours at the temperature of 100-120 ℃, then heating to 1450-1570 ℃, and preserving heat for 6-12 hours to obtain the lightweight alumina aggregate.
3. The method of claim 1, wherein the alumina powder is Al2O3The content is 46.7-72.3 parts, and the particle size of the bauxite powder is less than or equal to 0.074 mm.
4. The method of claim 1, wherein the alumina powder is Al2O3The content is more than or equal to 65wt percent, and the particle size of the bauxite powder is less than or equal to 0.074 mm.
5. The preparation method of the high-alumina heat-insulating brick as claimed in claim 1, wherein the water reducing agent is a mixture of sodium tripolyphosphate and melamine formaldehyde resin in a mass ratio of 2: 1.
6. A high-alumina heat-insulating brick, characterized in that it is prepared by the method of any one of claims 1 to 4.
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| CN1121493A (en) * | 1995-07-03 | 1996-05-01 | 淄博市淄川区查王乡社会福利耐火建材厂 | Cordierite light brick productive method |
| CN101066878A (en) * | 2007-06-14 | 2007-11-07 | 武汉科技大学 | Alumina-silica refractory brick containing light porous aggegate and its making process |
| CN101293777A (en) * | 2008-06-25 | 2008-10-29 | 河南省耕生耐火材料有限公司 | High-strength light weight castable refractory |
| CN102167622A (en) * | 2011-01-21 | 2011-08-31 | 武汉科技大学 | Aluminum-silicon light heat insulation brick and preparation method thereof |
| CN102167621A (en) * | 2011-01-21 | 2011-08-31 | 武汉科技大学 | Aluminum oxide hollow sphere light insulating brick and preparation method thereof |
| CN102584289A (en) * | 2012-02-08 | 2012-07-18 | 武汉科技大学 | Mullite lightweight aggregate and preparation method thereof |
| CN102976778A (en) * | 2012-12-10 | 2013-03-20 | 武汉科技大学 | Coal ash-based mullite light heat-insulation brick and preparation method thereof |
| CN103044045A (en) * | 2013-01-17 | 2013-04-17 | 武汉科技大学 | High-strength aluminum oxide light-weight heat insulation brick and preparation method thereof |
| CN103145434A (en) * | 2013-04-03 | 2013-06-12 | 武汉科技大学 | Aluminum oxide lightweight, heat-insulating and refractory product and preparation method thereof |
| CN103408312A (en) * | 2013-08-26 | 2013-11-27 | 武汉科技大学 | Aluminum-silicon-based lightweight castable and preparation method thereof |
| CN103467122A (en) * | 2013-09-02 | 2013-12-25 | 安徽瑞泰新材料科技有限公司 | Novel porous mullite lightweight aggregate and preparation method thereof |
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2021
- 2021-12-15 CN CN202111515409.3A patent/CN114014691A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1121493A (en) * | 1995-07-03 | 1996-05-01 | 淄博市淄川区查王乡社会福利耐火建材厂 | Cordierite light brick productive method |
| CN101066878A (en) * | 2007-06-14 | 2007-11-07 | 武汉科技大学 | Alumina-silica refractory brick containing light porous aggegate and its making process |
| CN101293777A (en) * | 2008-06-25 | 2008-10-29 | 河南省耕生耐火材料有限公司 | High-strength light weight castable refractory |
| CN102167622A (en) * | 2011-01-21 | 2011-08-31 | 武汉科技大学 | Aluminum-silicon light heat insulation brick and preparation method thereof |
| CN102167621A (en) * | 2011-01-21 | 2011-08-31 | 武汉科技大学 | Aluminum oxide hollow sphere light insulating brick and preparation method thereof |
| CN102584289A (en) * | 2012-02-08 | 2012-07-18 | 武汉科技大学 | Mullite lightweight aggregate and preparation method thereof |
| CN102976778A (en) * | 2012-12-10 | 2013-03-20 | 武汉科技大学 | Coal ash-based mullite light heat-insulation brick and preparation method thereof |
| CN103044045A (en) * | 2013-01-17 | 2013-04-17 | 武汉科技大学 | High-strength aluminum oxide light-weight heat insulation brick and preparation method thereof |
| CN103145434A (en) * | 2013-04-03 | 2013-06-12 | 武汉科技大学 | Aluminum oxide lightweight, heat-insulating and refractory product and preparation method thereof |
| CN103408312A (en) * | 2013-08-26 | 2013-11-27 | 武汉科技大学 | Aluminum-silicon-based lightweight castable and preparation method thereof |
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