CN111943700A - High-strength light heat-insulating plate with dispersed air holes and preparation method thereof - Google Patents
High-strength light heat-insulating plate with dispersed air holes and preparation method thereof Download PDFInfo
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- CN111943700A CN111943700A CN202010864141.3A CN202010864141A CN111943700A CN 111943700 A CN111943700 A CN 111943700A CN 202010864141 A CN202010864141 A CN 202010864141A CN 111943700 A CN111943700 A CN 111943700A
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- C—CHEMISTRY; METALLURGY
- 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
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/243—Setting, e.g. drying, dehydrating or firing ceramic articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
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- C—CHEMISTRY; METALLURGY
- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C—CHEMISTRY; METALLURGY
- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/10—Monolithic linings; Supports therefor
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- C—CHEMISTRY; METALLURGY
- 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
- C04B2235/32—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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- C—CHEMISTRY; METALLURGY
- 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
- C04B2235/3418—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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a high-strength light heat-insulating plate with dispersed air holes and a preparation method thereof, wherein the preparation method comprises the following steps: weighing 50-80% of an inorganic material, 5-20% of a fiber material, 5-20% of a high-temperature bonding agent and 5-15% of an organic foaming agent in parts by mass, placing the weighed raw materials into a mixing roll, mixing for 0.2-0.3 h, placing the mixed raw materials into a die, performing compression molding by using a press machine at a pressure of 0.5-2 MPa to obtain a blank, and then placing the blank into a heating furnace for heating treatment to obtain the heat insulation plate. The heat-insulating plate prepared by the preparation method has low heat-conducting coefficient and high strength, and can be widely applied to heat-insulating materials of various industrial kilns or lining materials of medium-temperature flame kilns.
Description
Technical Field
The invention relates to the field of refractory materials for kilns, in particular to a high-strength light heat-insulating plate with dispersed air holes and a preparation method thereof.
Background
The existing kiln heat insulation materials are commonly used for light bricks, light gathering bricks, refractory fiber boards, refractory fibers and the like, the heat conductivity coefficient of the light bricks is generally 0.3-0.5W/M.K, and the heat insulation effect needs to be improved; the heat conductivity coefficient of the refractory fiber board is 0.15-0.25W/M.K, so that the heat conductivity coefficient is not ideal and the price is high; the heat conductivity coefficient of the refractory fiber is lower by 0.12-0.2W/M.K, but the refractory fiber has large high-temperature shrinkage and rapid performance decay.
The existing kiln lining materials generally use heavy bricks, castable and the like, the heat conductivity coefficient of the existing kiln lining materials is generally 1-2W/M.K, the heat insulation effect is poor, the weight is heavier, the kiln body structure is complex, and the energy consumption of the kiln is high; the kiln lining material is also made of light mullite bricks or alumina hollow sphere products, the heat conductivity coefficient of the light mullite bricks is generally 0.3-0.45W/M.K, the heat conductivity coefficient of the alumina hollow spheres is generally 0.8-1.0W/M.K, and when the kiln lining material is used at 1200-1700 ℃, the heat insulation effect is good, but the heat conductivity coefficient is high.
Therefore, the heat insulation plate with low heat conductivity coefficient, high strength and light weight is developed to be suitable for application of various high-temperature industrial kilns, and has important significance for energy conservation of the high-temperature kilns in China.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a high-strength light heat-insulating plate with dispersed air holes and a preparation method thereof.
In order to achieve the purpose, the invention adopts the specific scheme that:
a preparation method of a high-strength light heat-insulating plate with dispersed air holes comprises the following steps: weighing 50-80% of inorganic material, 5-20% of fiber material, 5-20% of high-temperature bonding agent and 5-15% of organic foaming agent by mass, placing the weighed raw materials in a mixing roll, mixing for 0.2-0.3 h, placing the mixed raw materials in a die, pressing and molding by using a press machine at the pressure of 0.5-2 MPa to obtain a blank, and then placing the blank in a heating furnace for heating treatment to obtain the heat-insulating plate.
Further, the heating treatment is any one of drying, drying first and then low-temperature baking, or drying first and then high-temperature sintering.
Further, the drying comprises the following specific steps: and heating the blank placed in the heating furnace to 120-220 ℃ and preserving heat for 6-10 hours.
Further, the specific steps of drying first and then baking at low temperature are as follows: heating the blank placed in a heating furnace to 120-220 ℃, preserving heat for 6-10 hours, then heating to 600-900 ℃, preserving heat for 8-12 hours, carrying out low-temperature baking, and then cooling to room temperature.
Further, the obtained heat insulating plate is used as a heat insulating material in an industrial kiln.
Further, the specific steps of drying first and then sintering at high temperature are as follows: heating the blank placed in a heating furnace to 120-220 ℃, preserving heat for 6-10 hours, then heating to 1100-1500 ℃, preserving heat for 8-12 hours, carrying out high-temperature sintering, and then cooling to room temperature.
Further, the heat insulation plate obtained by high-temperature sintering is used as a lining material of an industrial kiln.
Further, the inorganic material is any one of an aluminum-silicon neutral material, a magnesium-based alkaline material or a silicon-based acidic material, or a mixed material obtained by mixing two materials, and the mixed material must contain 30-60% of the aluminum-silicon neutral material; the aluminum-silicon neutral material comprises the following main chemical components in percentage by mass: al (Al)2O330～90％、SiO280～99％；
The magnesium-based alkaline material comprises the following main chemical components in percentage by mass: 30-98% of MgO;
the silicon acidic material comprises the following main chemical components in percentage by mass: SiO 2290～98％。
Further, the fiber material is a refractory fiber or an organic cellulose;
the high-temperature bonding agent is water glass or resin;
the organic foaming agent is sodium dodecyl sulfate.
A high-strength light heat-insulating plate with dispersed air holes is prepared by the method.
Has the advantages that:
1. the invention takes inorganic materials, fiber materials, high-temperature binding agent and organic foaming agent as main raw materials, wherein the fiber materials are taken as reinforcing agents, thus being easy to form and improving the strength; the high-temperature binding agent is beneficial to improving the binding strength, the organic foaming agent forms dispersed micro air holes in a foggy form in a product, and the heat conductivity coefficient of the product is very low due to the existence of the micro air holes.
2. The heat-insulating plate prepared by the invention has the advantages of low heat conductivity coefficient (0.04-0.2 w/m.k), high strength (1.5-4 MPa), light weight (the volume density is 0.5-0.8 g/cm)3) The heat-insulating plate for the heat preservation of the kiln can be used at the temperature of 700-900 ℃, the heat-insulating plate for the lining of the medium-temperature flame kiln can be used at the temperature of 900-1500 ℃, the thickness of the brickwork of the kiln can be greatly reduced by using the heat-insulating plate, the heat absorption of the kiln body is reduced, and the heat efficiency of the kiln is improved.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
A preparation method of a high-strength light heat-insulating plate with dispersed air holes comprises the following steps: weighing 50-80% of inorganic material, 5-20% of fiber material, 5-20% of high-temperature bonding agent and 5-15% of organic foaming agent by mass, placing the weighed raw materials into a mixing roll for mixing for 0.2-0.3 h, then placing the mixed raw materials into a die, pressing and molding by using a press machine at the pressure of 0.5-2 MPa to obtain a blank, and then placing the blank into a heating furnace for heating treatment to obtain the heat-insulating plate.
The heating treatment is any one of drying, drying first and then low-temperature baking or drying first and then high-temperature sintering.
The drying method comprises the following specific steps: and heating the blank placed in the heating furnace to 120-220 ℃ and preserving heat for 6-10 hours.
The specific steps of drying firstly and then baking at low temperature are as follows: heating the blank placed in a heating furnace to 120-220 ℃, preserving heat for 6-10 hours, then heating to 600-900 ℃, preserving heat for 8-12 hours, carrying out low-temperature baking, and then cooling to room temperature.
The heat insulation plate obtained by drying or drying firstly and then baking at low temperature is used as a heat insulation material in an industrial kiln.
The specific steps of drying firstly and then sintering at high temperature are as follows: heating the blank placed in a heating furnace to 120-220 ℃, preserving heat for 6-10 hours, then heating to 1100-1500 ℃, preserving heat for 8-12 hours, carrying out high-temperature sintering, and then cooling to room temperature.
The heat insulating board obtained by high-temperature sintering is used as a lining material of an industrial kiln.
The inorganic material is any one of an aluminum-silicon neutral material, a magnesium-based alkaline material or a silicon-based acidic material, or a mixed material obtained by mixing two materials, and the mixed material must contain 30-60% of the aluminum-silicon neutral material; the aluminum-silicon neutral material comprises the following main chemical components in percentage by mass: al (Al)2O330～90％、SiO280～99％；
The magnesium-based alkaline material comprises the following main chemical components in percentage by mass: 30-98% of MgO;
the silicon acidic material comprises the following main chemical components in percentage by mass: SiO 2290～98％。
Further, the fiber material is a refractory fiber or an organic cellulose; the high-temperature bonding agent is water glass or resin; the organic foaming agent is sodium dodecyl sulfate.
According to the preparation method, the high-strength light heat-insulating plate with dispersed air holes can be obtained.
Example 1
A preparation method of a heat insulation plate for a heat insulation material in an industrial kiln comprises the following steps: weighing 50% of inorganic material, 20% of fiber material (refractory fiber), 20% of high-temperature bonding agent (water glass) and 10% of organic foaming agent by mass, placing the weighed raw materials into a mixing roll, mixing for 0.2h, placing the mixed raw materials into a die, pressing and molding by using a press machine at the pressure of 0.5MPa to obtain a blank, placing the blank into a heating furnace, heating to 120 ℃, and preserving heat for 10h to dry the blank.
Wherein the inorganic material is an aluminum silicon neutral material.
Example 2
A preparation method of a heat insulation plate for a heat insulation material in an industrial kiln comprises the following steps: weighing 50% of inorganic material, 20% of fiber material (refractory fiber), 20% of high-temperature bonding agent (water glass) and 10% of organic foaming agent by mass, placing the weighed raw materials into a mixing roll, mixing for 0.2h, placing the mixed raw materials into a die, pressing and molding by using a press machine at the pressure of 0.5MPa to obtain a blank, placing the blank into a heating furnace, heating to 120 ℃, and preserving heat for 10h to dry the blank. And then placing the blank in high-temperature sintering equipment, heating to 900 ℃, preserving heat for 8 hours, carrying out low-temperature sintering, and then cooling to room temperature.
Wherein the inorganic material is an aluminum silicon neutral material.
Example 3
A preparation method of a heat insulation plate for a heat insulation material in an industrial kiln comprises the following steps: weighing 80% of inorganic material, 5% of fiber material (organic cellulose), 10% of high-temperature bonding agent (resin) and 5% of organic foaming agent by mass, placing the weighed raw materials in a mixing roll, mixing for 0.3h, placing the mixed raw materials in a die, performing compression molding by using a press machine under the pressure of 2MPa to obtain a blank, placing the blank in a heating furnace, heating to 220 ℃ and preserving heat for 6h to dry the blank, placing the blank in high-temperature sintering equipment, heating to 1200 ℃ and preserving heat for 8h to perform high-temperature sintering, and cooling to room temperature.
Wherein the inorganic material is 60% of aluminum silicon neutral material and 40% of magnesium alkaline material.
Effects of the embodiment
The thermal conductivity, compressive strength, bulk density and service temperature properties of the insulation panels prepared in examples 1 to 3 were measured, wherein the thermal conductivity of the insulation panel was measured by the flat plate method, the compressive strength of the insulation panel was measured by the national standard GB/3997.2-1983, the bulk density of the insulation panel was measured by the method of measuring weight and physical geometry, the change in the restrike line of the insulation panel was measured by the national standard GB/3997.1-1998, and the service temperature of the insulation panel was judged by the change in the restrike line, and the results are shown in table 1.
Table 1 thermal conductivity, strength, bulk density and service temperature of insulation panels prepared in examples 1-4
| Coefficient of thermal conductivity (w/m. k) | Compressive strength (MPa) | Bulk Density (g/cm3) | Use temperature (. degree.C.) | |
| Example 1 | 0.05 | 3.0 | 0.68 | 800 |
| Example 1 | 0.06 | 3.1 | 0.69 | 900 |
| Example 3 | 0.06 | 3.3 | 0.7 | 1250 |
As can be seen from Table 1, the thermal conductivity of the heat-insulating plate prepared in the embodiment 1-3 is equal to 1/3-1/5 of a common light brick, and is equal to 1/2-1/4 of aluminum silicate fiber, the strength of the heat-insulating plate is 2-3 times higher than that of the heat-insulating plate, the weight of the heat-insulating plate is 10-30% lower than that of the common light brick, the use effect is better, and the cost performance is higher.
The foregoing is merely a preferred embodiment of the invention and is not to be construed as limiting the invention in any way. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The preparation method of the high-strength light heat-insulating plate with the dispersed air holes is characterized by comprising the following steps of: weighing 50-80% of inorganic material, 5-20% of fiber material, 5-20% of high-temperature bonding agent and 5-15% of organic foaming agent by mass fraction, placing the weighed raw materials into a mixing roll for mixing for 0.2-0.3 h, then placing the mixed raw materials into a die, pressing and molding by using a press machine at the pressure of 0.5-2 MPa to obtain a blank, and then placing the blank into a heating furnace for heating treatment to obtain the heat-insulating plate.
2. The method for preparing a high-strength light-weight thermal insulation plate with dispersed air holes according to claim 1 is characterized in that: the heating treatment is any one of drying, drying first and then low-temperature baking or drying first and then high-temperature sintering.
3. The method for preparing the high-strength light-weight thermal insulation plate with the dispersed air holes according to claim 2 is characterized in that: the drying method comprises the following specific steps: and heating the blank placed in the heating furnace to 120-220 ℃ and preserving heat for 6-10 hours.
4. The method for preparing the high-strength light-weight thermal insulation plate with the dispersed air holes according to claim 2 is characterized in that: the specific steps of drying firstly and then baking at low temperature are as follows: heating the blank placed in a heating furnace to 120-220 ℃, preserving heat for 6-10 hours, then heating to 600-900 ℃, preserving heat for 8-12 hours, carrying out low-temperature baking, and then cooling to room temperature.
5. The method for preparing a high-strength light-weight thermal insulation plate with dispersed air holes according to claim 3 or 4, is characterized in that: the obtained heat insulation plate is used as a heat insulation material in an industrial kiln.
6. The method for preparing the high-strength light-weight thermal insulation plate with the dispersed air holes according to claim 2 is characterized in that: the specific steps of drying firstly and then sintering at high temperature are as follows: heating the blank placed in a heating furnace to 120-220 ℃, preserving heat for 6-10 hours, then heating to 1100-1500 ℃, preserving heat for 8-12 hours, carrying out high-temperature sintering, and then cooling to room temperature.
7. The method for preparing the high-strength light-weight thermal insulation plate with the dispersed air holes according to claim 6 is characterized in that: the heat insulating board obtained by high-temperature sintering is used as a lining material of an industrial kiln.
8. The method for preparing a high-strength light-weight thermal insulation plate with dispersed air holes according to claim 1 is characterized in that: the inorganic material is any one of an aluminum-silicon neutral material, a magnesium-based alkaline material or a silicon-based acidic material, or a mixed material obtained by mixing two materials, and the mixed material must contain 30-60% of the aluminum-silicon neutral material;
the aluminum-silicon neutral material comprises the following main chemical components in percentage by mass: al (Al)2O3 30~90%、SiO2 80~99%；
The magnesium-based alkaline material comprises the following main chemical components in percentage by mass: 30-98% of MgO;
among the silicon-based acidic materialsThe main chemical components and the mass fraction thereof are as follows: SiO 22 90~98%。
9. The method for preparing a high-strength light-weight thermal insulation plate with dispersed air holes according to claim 1 is characterized in that: the fiber material is refractory fiber or organic cellulose;
and/or the presence of a gas in the gas,
the high-temperature bonding agent is water glass or resin;
and/or the presence of a gas in the gas,
the organic foaming agent is sodium dodecyl sulfate.
10. A high strength lightweight insulation panel having dispersed air cells characterized in that it is prepared by the method of claim 1.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112710153A (en) * | 2021-02-05 | 2021-04-27 | 中钢南京环境工程技术研究院有限公司 | Preparation method of large-size machinable refractory heat-insulating plate |
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| CN112710153A (en) * | 2021-02-05 | 2021-04-27 | 中钢南京环境工程技术研究院有限公司 | Preparation method of large-size machinable refractory heat-insulating plate |
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