CN117287980B - Heat-insulating composite brick and preparation method thereof - Google Patents
Heat-insulating composite brick and preparation method thereof Download PDFInfo
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- CN117287980B CN117287980B CN202311575096.XA CN202311575096A CN117287980B CN 117287980 B CN117287980 B CN 117287980B CN 202311575096 A CN202311575096 A CN 202311575096A CN 117287980 B CN117287980 B CN 117287980B
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- insulating brick
- brick body
- hollow ball
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- 239000011449 brick Substances 0.000 title claims abstract description 195
- 239000002131 composite material Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000012212 insulator Substances 0.000 claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 29
- 239000011148 porous material Substances 0.000 claims abstract description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 30
- 238000009413 insulation Methods 0.000 claims description 24
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 16
- 229920000742 Cotton Polymers 0.000 claims description 13
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 11
- 229910021485 fumed silica Inorganic materials 0.000 claims description 10
- 229910052863 mullite Inorganic materials 0.000 claims description 10
- 239000000377 silicon dioxide Substances 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 9
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 8
- 239000012783 reinforcing fiber Substances 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 7
- 239000007767 bonding agent Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 239000004115 Sodium Silicate Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 2
- 239000010431 corundum Substances 0.000 claims description 2
- 239000003365 glass fiber Substances 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims 1
- RLQWHDODQVOVKU-UHFFFAOYSA-N tetrapotassium;silicate Chemical compound [K+].[K+].[K+].[K+].[O-][Si]([O-])([O-])[O-] RLQWHDODQVOVKU-UHFFFAOYSA-N 0.000 claims 1
- 230000000052 comparative effect Effects 0.000 description 12
- 238000004321 preservation Methods 0.000 description 12
- 239000011094 fiberboard Substances 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 239000012774 insulation material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000000378 calcium silicate Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004111 Potassium silicate Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000011464 hollow brick Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910052913 potassium silicate Inorganic materials 0.000 description 1
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
- F27D1/06—Composite bricks or blocks, e.g. panels, modules
- F27D1/063—Individual composite bricks or blocks
-
- 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
- C04B35/01—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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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- 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
- C04B35/14—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 silica
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
-
- 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
- C04B38/08—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding porous substances
-
- 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
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
- C04B2235/3826—Silicon carbides
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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
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/428—Silicon
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/52—Constituents or additives characterised by their shapes
- C04B2235/5208—Fibers
- C04B2235/5216—Inorganic
- C04B2235/522—Oxidic
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Insulation (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a heat-insulating composite brick and a preparation method thereof, wherein the heat-insulating composite brick comprises a heat-insulating brick body and a heat-insulating brick body; the heat-insulating brick body comprises a heat insulator and hollow ball aggregates embedded in the heat insulator, and the heat-insulating brick body is provided with a damage surface, wherein the damage surface exposes pores of the hollow ball aggregates; the insulating brick body is formed on the damaged surface, and part of raw materials of the insulating brick body are embedded into the pores. The heat-insulating composite brick has the remarkable advantages of light weight, portability, good heat-insulating performance and the like.
Description
Technical Field
The invention relates to the technical field of new refractory materials, in particular to a heat-insulating composite brick and a preparation method thereof.
Background
Energy saving and consumption reduction are the development direction of low carbon economy, and kiln heat preservation and heat insulation are one of important measures for realizing energy saving and consumption reduction in kiln industry. According to the sintering requirement of the kiln, the structural design of the kiln body is optimized, and the refractory material with good heat preservation and insulation performance is applied to the key part of the kiln, so that the method is one of the important means for realizing energy conservation and consumption reduction of the kiln.
At present, the kiln wall structure sequentially comprises a refractory brick layer, a heat insulation board layer and a decoration board layer from inside to outside, wherein the heat insulation brick layer and the heat insulation brick layer play a key role in energy conservation of the kiln, and the heat insulation brick material with light weight, high strength, small heat capacity and low heat conductivity is designed to replace the traditional heavy weight, large heat capacity and large heat absorption capacity, so that the kiln wall structure is a development direction for realizing energy conservation and consumption reduction of the kiln.
Chinese patent CN210802035U discloses a kiln thermal insulation structure, the kiln wall of which comprises refractory bricks, nano thermal insulation materials and a calcium silicate board from inside to outside, wherein the nano thermal insulation materials are filled between the refractory bricks and the calcium silicate board in a pouring manner. Although the construction method is simple, the method has two defects, firstly, the pouring mode is difficult to show the heat preservation characteristic advantages of the nano heat preservation material, and in addition, the repair of the furnace wall and the furnace top in the later stage of the kiln brings great difficulty, and the nano heat preservation material is destroyed during repair, so that the waste is huge.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a heat-insulating composite brick which is light in weight, portable to use and good in heat-insulating performance and a preparation method thereof.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a heat-insulating composite brick comprises a heat-insulating brick body and a heat-insulating brick body;
the heat-insulating brick body comprises a heat insulator and hollow ball aggregates embedded in the heat insulator, and the heat-insulating brick body is provided with a damage surface, wherein the damage surface exposes pores of the hollow ball aggregates;
the insulating brick body is formed on the damaged surface, and part of raw materials of the insulating brick body are embedded into the pores.
The invention also provides a preparation method of the heat-insulating composite brick, which comprises the following steps:
mixing the raw materials of the heat insulator and the hollow ball aggregate with a bonding agent to prepare a heat-insulating brick blank;
sintering the heat-insulating brick blank to enable raw materials of the heat insulator to react to generate the heat insulator, wherein the hollow ball aggregate is inlaid in grids of the heat insulator to obtain the heat-insulating brick;
carrying out damage treatment on one surface of the heat insulation brick body to obtain a damaged surface;
mixing the raw materials of the insulating brick body to obtain an insulating brick mixture;
and pressing the insulating brick mixture onto the damaged surface to enable part of the insulating brick mixture to be embedded into the exposed holes, so as to obtain the heat-insulating composite brick.
The implementation of the embodiment of the invention has the following beneficial effects:
according to the embodiment of the invention, the heat-insulating brick body with the hollow ball aggregate is formed, so that the specific gravity of the composite brick is reduced, and the forming die with the damaged surface as the heat-insulating brick body is used, so that part of raw materials of the heat-insulating brick body can be embedded into the holes of the hollow ball aggregate with the exposed damaged surface to form a cross-network composite brick structure, the binding force of the heat-insulating brick body and the heat-insulating brick body is enhanced, the composite brick is integrated, and compared with the single heat-insulating brick body and the heat-insulating brick body, the use convenience is greatly enhanced, and the heat-insulating and heat-insulating effect is enhanced at the composite interface of the heat-insulating brick body and the heat-insulating brick body.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below 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 discloses a heat-insulating composite brick which is characterized by comprising a heat-insulating brick body and a heat-insulating brick body; the heat-insulating brick body comprises a heat insulator and hollow ball aggregates embedded in the heat insulator, and is provided with a damage surface, wherein the damage surface exposes pores of the hollow ball aggregates; the insulating brick body is formed on the damaged surface, and part of raw materials of the insulating brick body are embedded into the pores.
According to the technical scheme, the heat-insulating brick body with the hollow ball aggregate is formed, so that the specific gravity of the composite brick is reduced, the surface is damaged to be the forming die of the heat-insulating brick body, part of raw materials of the heat-insulating brick body can be embedded into the holes of the hollow ball aggregate with the exposed damaged surface to form a cross-network composite brick structure, the binding force of the heat-insulating brick body and the heat-insulating brick body is enhanced, the composite brick is integrated, and compared with the single heat-insulating brick body and the single heat-insulating brick body, the use convenience is greatly improved, and the heat-insulating and heat-insulating effects are also enhanced at the composite interface of the heat-insulating brick body and the heat-insulating brick body.
In the technical scheme, the heat-insulating brick body is a hollow brick body, and the internal pores have the advantages of low heat conduction and small heat capacity.
In one embodiment, the thermal conductivity of the insulating brick body is less than the thermal conductivity of the gas; or the thermal conductivity of the insulating brick body is equivalent to that of the gas. In this embodiment, the heat preservation principle of the heat preservation brick body is: the heat conductivity of the heat is reduced, and the heat is prevented from being transmitted to the outside. In the invention, the heat insulation brick body and the heat preservation brick body are tightly connected at the composite interface, so that the heat preservation effect can be enhanced.
In one embodiment, the thermal conductivity of the insulating brick body is 0.02 W.m -1 ·K -1 ~0.042W·m -1 ·K -1 。
In a specific embodiment, the raw material of the insulating brick body uses fumed silica as a main material, the heat conductivity is extremely low and is close to the vacuum heat conductivity, the strength and the hardness of the insulating brick body are improved by doping reinforcing powder and reinforcing fiber, meanwhile, the porosity in the insulating brick body can be improved by doping the reinforcing fiber, and the heat conductivity of the insulating brick body is reduced. Specifically, the raw materials of the insulating brick body comprise the following components in parts by weight:
65-75 parts of fumed silica, 10-20 parts of reinforcing powder, 10-20 parts of reinforcing fiber and an aqueous binder solution with the added mass being 15% -25% of the total mass of the fumed silica, the reinforcing powder and the reinforcing fiber.
The reinforcing powder may include silicon carbide powder and/or silica micropowder, the reinforcing fiber may include one or more of cotton silicate fiber, mullite fiber, glass fiber, etc., and the binder aqueous solution may include sodium silicate aqueous solution and/or potassium silicate aqueous solution.
In a specific embodiment, the raw materials of the insulating brick body comprise the following components in parts by weight:
65-75 parts of fumed silica, 10-20 parts of silicon carbide powder, 10-20 parts of cotton silicate fiber and an aqueous binder solution with the added mass being 15-25% of the total mass of the fumed silica, the silicon carbide powder and the cotton silicate fiber.
The components and the proportion thereof lead the thermal conductivity of the insulating brick body to be 0.02 W.m -1 ·K -1 ~0.042W·m -1 ·K -1 Is equivalent to the thermal conductivity of gas, can provide excellent heat insulation performance, and has the density of 0.25g/cm 3 ~0.32g/cm 3 The kiln wall has lighter weight, and the outer surface of the kiln wall is at the temperature of the composite interface of less than or equal to 1000 DEG CThe temperature rise of the surface is less than or equal to 30 ℃, and the heat preservation and insulation performance is excellent.
In one embodiment, the method for preparing the insulating brick body comprises the following steps:
1) And mixing the raw materials of the insulating brick body to obtain the insulating brick mixture.
Specifically, in one embodiment, the insulating brick mixture is obtained by mixing fumed silica, silicon carbide powder, cotton silicate fiber and an aqueous solution of sodium silicate.
2) Pressing the insulating brick mixture onto the damaged surface to embed part of the insulating brick mixture into the exposed pores, thereby obtaining the heat-insulating composite brick.
In a specific embodiment, the heat insulator may be one or more of mullite, corundum-mullite, corundum, etc.; the heat insulator is made of high-aluminum materials, has the excellent performances of light weight, high strength, good fire resistance/heat insulation performance, low heat conductivity and small heat capacity, and can be directly contacted with flame.
The hollow ball aggregate can comprise alumina hollow ball aggregate, mullite hollow ball aggregate and the like, and the hollow ball aggregate can reduce the overall density of the heat-insulating brick body.
In a specific embodiment, the raw materials of the heat insulation brick body comprise the following components in parts by weight:
60-70 parts of alumina hollow ball aggregate, 8-20 parts of activated alumina, 5-10 parts of silica micropowder, and a pore-forming agent accounting for 10-15% of the total mass of the alumina hollow ball aggregate, the activated alumina and the silica micropowder and a binding agent accounting for 4-8% of the total mass of the alumina hollow ball aggregate, the activated alumina and the silica micropowder.
In one embodiment, the pore former comprises organic light polymer spheres that are converted to a gas during sintering to control the specific gravity of the insulating brick.
In one embodiment, the binder is an organic binder.
In one embodiment, the method for preparing the heat insulation brick comprises the following steps:
1) And mixing the raw materials of the heat insulator and the hollow ball aggregate by using a bonding agent to prepare a heat-insulating brick blank.
In the technical scheme, specifically, the raw materials of the heat insulator comprise active alumina and silica micropowder, and the alumina hollow sphere aggregate, the pore-forming agent, the active alumina, the silica micropowder and the bonding agent are wet mixed to prepare the heat-insulating brick blank.
2) And sintering the heat-insulating brick blank to enable raw materials of the heat insulator to react to generate the heat insulator, and embedding the hollow ball aggregate into crystal grids of the heat insulator to obtain the heat-insulating brick.
In the technical scheme, the active alumina and the silicon micropowder react to generate the mullite crystal form insulator, and the alumina hollow spheres are embedded in mullite crystal grids.
The heat insulation body is manufactured by adopting a sintering process, so that the integral strength, hardness and high-temperature stability of the heat insulation brick body are improved.
After the heat-insulating brick body is obtained, a surface of the heat-insulating brick body is subjected to damage treatment, pores of the hollow ball aggregate are exposed to obtain a damaged surface, then the heat-insulating brick body is directly formed on the damaged surface, part of raw materials of the heat-insulating brick body are embedded into the pores, and the direct bonding strength of the heat-insulating brick body and the heat-insulating brick body is enhanced, so that the heat-insulating brick body and the heat-insulating brick body are integrated, the construction and the maintenance of a kiln are facilitated, and the heat-insulating performance at a composite interface of the heat-insulating brick body and the heat-insulating brick body is better.
In the above embodiments, the thickness of the insulating brick is 100 mm to 150 mm, preferably 114 mm, and the thickness of the insulating brick is 25 mm to 120 mm, preferably 100 mm.
The following are specific examples.
Table 1 shows the compositions and contents of the insulating brick bodies and insulating brick bodies of the respective examples.
Table 1: the heat insulating brick body and the components and the content of the heat insulating brick body of each embodiment
The preparation method of the heat-insulating composite brick comprises the following steps:
1) And uniformly mixing the raw materials of the heat-insulating brick body, and performing vibration molding to obtain a heat-insulating brick blank body.
2) And sintering the heat-insulating brick blank at 1550 ℃ to form the heat-insulating brick.
3) And (3) carrying out damage treatment on one surface of the heat insulation brick body to obtain a damaged surface.
4) And uniformly mixing the raw materials of the insulating brick body to obtain an insulating brick mixture, coating the insulating brick mixture on the damaged surface, and then pressing at low pressure to form the insulating brick body, thereby obtaining the heat-insulating composite brick.
Comparative example D1:
comparative example D1 differs from example 1 only in that: the insulating brick body adopts a silicate cotton fiber board, and the silicate cotton fiber board is tightly connected with the insulating brick body with the undamaged surface.
Comparative example D2
Comparative example D2 differs from example 4 only in that: the insulating brick body adopts a silicate cotton fiber board, and the silicate cotton fiber board is tightly connected with the insulating brick body with the undamaged surface.
Comparative example D3
Comparative example D3 differs from example 7 only in that: the insulating brick body adopts a silicate cotton fiber board, and the silicate cotton fiber board is tightly connected with the insulating brick body with the undamaged surface.
The performance indexes of the heat-insulating composite bricks prepared in each example and comparative example in table 1 are shown in table 2, wherein the exterior temperature refers to the temperature of the exterior surface of the insulating brick body, and the heat flux density refers to the heat flux density in the insulating brick body.
Table 2: performance index of the heat insulation composite bricks of each example and comparative example
From table 2 it can be seen that: the density of the heat insulation brick body is 1.0-1.2 g/cm 3 The heat conductivity coefficient is 0.55-0.88 W.m -1 ·k -1 The normal temperature compressive strength is more than 8Mpa; the density of the insulating brick body is 0.25-0.32 g/cm 3 The heat conductivity coefficient is as follows: 0.02-0.042 W.m -1 ·k -1 Is equivalent to the heat conductivity coefficient of air. Compared with comparative examples D1-D3, when the temperature of the high-temperature surface of the heat-insulating brick body is 1050 ℃, the temperature of the composite interface of the heat-insulating brick body is obviously higher than that of comparative examples D1-D3, the heat flow density in the heat-insulating brick body is obviously lower than that of comparative examples D1-D3, and the temperature rise of the outer surface of the heat-insulating brick body is obviously lower than that of comparative examples D1-D3, so that the heat-insulating effect of the composite brick is better than that of the prior art.
In addition, the heat-insulating brick body and the heat-insulating brick body of the composite brick are strong in binding force, and the heat-insulating brick body are not separated when the kiln wall is transported and piled and the broken kiln wall is repaired, so that the composite brick is convenient to use. If the surface is not damaged, the insulating brick body is directly pressed on the insulating brick body, the bonding strength between the insulating brick body and the insulating brick body is weaker, the insulating brick body and the insulating brick body are easy to separate, and particularly when a broken kiln wall is repaired, the insulating brick body can fall off in a large area, and after a kiln is stopped for a period of time, the kiln is opened again, and the insulating brick body is easy to fall off due to expansion caused by heat and contraction caused by temperature difference.
When the separately prepared heat insulation brick body and the heat preservation brick body are used, two modes of construction can be adopted, one mode is that the heat insulation brick body and the heat preservation brick body are bonded by using an adhesive, but the adhesive layer can store heat, so that energy efficiency is wasted, and the thickness and the specific gravity of the wall are increased; the other is casting, but casting is difficult to fully show the advantages of the heat insulation property of the heat insulation material.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (8)
1. The heat-insulating composite brick is characterized by comprising a heat-insulating brick body and a heat-insulating brick body;
the heat-insulating brick body comprises a heat insulator and hollow ball aggregates embedded in the heat insulator, and the heat-insulating brick body is provided with a damage surface, wherein the damage surface exposes pores of the hollow ball aggregates;
the insulating brick body is formed on the damaged surface, and part of raw materials of the insulating brick body are embedded into the pores;
the insulating brick body comprises the following raw materials in parts by weight:
65-75 parts of fumed silica, 10-20 parts of reinforcing powder, 10-20 parts of reinforcing fiber and an aqueous binder solution with the added mass being 15% -25% of the total mass of the fumed silica, the reinforcing powder and the reinforcing fiber;
the reinforcing powder comprises one or more than two of silicon carbide powder and/or silicon dioxide micropowder;
the reinforcing fiber comprises one or more than two of cotton silicate fiber, mullite fiber and glass fiber;
the aqueous binder solution includes an aqueous sodium silicate solution and/or an aqueous potassium silicate solution.
2. The heat-insulating composite brick according to claim 1, wherein the raw materials of the heat-insulating brick body comprise the following components in parts by mass:
65-75 parts of fumed silica, 10-20 parts of silicon carbide powder, 10-20 parts of cotton silicate fiber and an aqueous binder solution with the added mass being 15% -25% of the total mass of the fumed silica, the silicon carbide powder and the cotton silicate fiber.
3. The heat-insulating composite brick according to any one of claims 1 to 2, wherein the preparation method of the heat-insulating brick body comprises the following steps:
mixing the raw materials of the insulating brick body to obtain an insulating brick mixture;
and pressing the insulating brick mixture onto the damaged surface to enable part of the insulating brick mixture to be embedded into the exposed holes, so as to obtain the heat-insulating composite brick.
4. The heat-insulating composite brick according to any one of claims 1 to 2, wherein the heat insulator is one or more of mullite, corundum-mullite, and corundum;
the hollow ball aggregate comprises alumina hollow ball aggregate and/or mullite hollow ball aggregate.
5. The heat-insulating composite brick according to any one of claims 1-2, wherein the raw materials of the heat-insulating brick body comprise the following components in parts by mass:
60-70 parts of alumina hollow ball aggregate, 8-25 parts of activated alumina and 5-15 parts of silica micropowder, and a pore-forming agent accounting for 10-15% of the total mass of the alumina hollow ball aggregate, the activated alumina and the silica micropowder and a bonding agent accounting for 4-8% of the total mass of the alumina hollow ball aggregate, the activated alumina and the silica micropowder are added.
6. The heat-insulating composite brick according to claim 1, wherein the preparation method of the heat-insulating brick body comprises the following steps:
mixing the raw materials of the heat insulator and the hollow ball aggregate with a bonding agent to prepare a heat-insulating brick blank;
and sintering the heat-insulating brick blank to enable raw materials of the heat insulator to react to generate the heat insulator, and embedding the hollow ball aggregate into grids of the heat insulator to obtain the heat-insulating brick.
7. The heat-insulating composite brick according to claim 1, wherein,
the thickness of the heat insulation brick body is 100-150 mm;
the thickness of the insulating brick body is 25-120 mm.
8. A method for preparing the heat-insulating composite brick according to any one of claims 1 to 7, which is characterized by comprising the following steps:
mixing the raw materials of the heat insulator and the hollow ball aggregate with a bonding agent to prepare a heat-insulating brick blank;
sintering the heat-insulating brick blank to enable raw materials of the heat insulator to react to generate the heat insulator, wherein the hollow ball aggregate is inlaid in grids of the heat insulator to obtain the heat-insulating brick;
carrying out damage treatment on one surface of the heat insulation brick body to obtain a damaged surface;
mixing the raw materials of the insulating brick body to obtain an insulating brick mixture;
and pressing the insulating brick mixture onto the damaged surface to enable part of the insulating brick mixture to be embedded into the exposed holes, so as to obtain the heat-insulating composite brick.
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