CN108033756B - High-density ceramic fiber board and preparation method thereof - Google Patents
High-density ceramic fiber board and preparation method thereof Download PDFInfo
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- CN108033756B CN108033756B CN201711316952.4A CN201711316952A CN108033756B CN 108033756 B CN108033756 B CN 108033756B CN 201711316952 A CN201711316952 A CN 201711316952A CN 108033756 B CN108033756 B CN 108033756B
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention provides a high-density ceramic fiberboard which is prepared from short-cut ceramic fibers, an inorganic bonding agent, a refractory filler and a filter aid, wherein the mass ratio of the solid contents of the ceramic fibers and the inorganic bonding agent to the refractory filler is (2.0-5.5) to (0.5-1.5) to (3.5-6.5), and the mass of the filter aid accounts for 4-10% of the total mass of the solid contents of the ceramic fibers and the inorganic bonding agent and the refractory filler. According to the invention, the density of the product after molding is improved by chopping the ceramic fiber, the use amount of the refractory filler is increased, and the filter aid is preferably used, so that the product not only can easily reach high density, but also the strength of the ceramic fiber board is increased, and the filler can be completely flocculated on the fiber, and good water filtration can be realized in the molding process.
Description
Technical Field
The invention belongs to the technical field of fiber boards, and particularly relates to a high-density ceramic fiber board and a preparation method thereof.
Background
The ceramic fiber board produced by the prior art uses ceramic fiber, organic binder, inorganic binder and a small amount of refractory filler as main raw materials, and is produced by a vacuum suction filtration or fourdrinier forming production process, so that the manufactured ceramic fiber board has low density, the strength can only meet the self-supporting capability, larger pressure cannot be borne, and the application field has great limitation.
At present, the domestic production technology for producing the ceramic fiber board is difficult to reach 600kg/m3Above, the compressive strength is less than 1MPa, and there is a great limitation in use. At present, a refractory material with strong bearing capacity and good heat preservation effect is required in metallurgical steel ladles and ceramic kilns, and can bear larger weight in the using process.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a high-density ceramic fiber board and a method for manufacturing the same, wherein the ceramic fiber board provided by the present invention has high density and compressive strength.
The invention provides a high-density ceramic fiberboard which is prepared from short-cut ceramic fibers, an inorganic bonding agent, a refractory filler and a filter aid, wherein the mass ratio of the solid contents of the ceramic fibers and the inorganic bonding agent to the refractory filler is (2.0-5.5) to (0.5-1.5) to (3.5-6.5), and the mass of the filter aid accounts for 4-10% of the total mass of the solid contents of the ceramic fibers and the inorganic bonding agent and the refractory filler.
Preferably, the chopped ceramic fibers have a length of 0.05mm to 1 mm.
Preferably, the chopped ceramic fibers are selected from one or more of magnesium silicate fibers, aluminum silicate fibers, alumina fibers, zirconium-containing ceramic fibers, chromium-containing ceramic fibers, and soluble ceramic fibers.
Preferably, the inorganic binder is silica sol, and the solid content of the inorganic binder is 10-40%.
Preferably, the refractory filler is selected from one or more of silica micropowder, alumina powder, kyanite powder, wollastonite powder, kaolin and attapulgite.
Preferably, the filter aid is selected from pregelatinized starch.
Preferably, the high-density ceramic fiber board has a density of 600kg/m3～1000kg/m3。
The invention also provides a preparation method of the high-density ceramic fiber board, which comprises the following steps:
A) mixing the short-cut ceramic fibers, the inorganic bonding agent, the refractory filler and water to obtain mixed slurry;
B) mixing the mixed slurry with a filter aid, and flocculating to obtain flocculated slurry;
C) and pressing, molding and drying the flocculated slurry to obtain the high-density ceramic fiberboard.
Preferably, the concentration of the mixed slurry is 1% to 10%.
Preferably, the forming is performed by a fourdrinier forming device or a vacuum suction filtration device.
Compared with the prior art, the invention provides a high-density ceramic fiber board which is prepared from short ceramic fibers, an inorganic bonding agent, a refractory filler and a filter aid, wherein the mass ratio of the solid contents of the ceramic fibers and the inorganic bonding agent to the refractory filler is (2.0-5.5) to (0.5-1.5) to (3.5-6.5), and the mass of the filter aid accounts for 4-10% of the total mass of the solid contents of the ceramic fibers and the inorganic bonding agent and the refractory filler. According to the invention, the density of the product after molding is improved by chopping the ceramic fiber, the use amount of the refractory filler is increased, and the filter aid is preferably used, so that the product not only can easily reach high density, but also the strength of the ceramic fiber board is increased, and the filler can be completely flocculated on the fiber, and good water filtration can be realized in the molding process.
The results show that the bulk density of the high-density ceramic fiber board provided by the invention is up to 1000Kg/m3The compression strength is up to 10MPa, and the use temperature can reach more than 1000 ℃.
Detailed Description
The invention provides a high-density ceramic fiberboard which is prepared from short-cut ceramic fibers, an inorganic bonding agent, a refractory filler and a filter aid, wherein the mass ratio of the solid contents of the ceramic fibers and the inorganic bonding agent to the refractory filler is (2.0-5.5) to (0.5-1.5) to (3.5-6.5), and the mass of the filter aid accounts for 4-10% of the total mass of the solid contents of the ceramic fibers and the inorganic bonding agent and the refractory filler.
The high-density ceramic fiber board provided by the invention is prepared from short ceramic fibers, an inorganic bonding agent, a refractory filler and a filter aid.
Wherein, in the invention, the length of the chopped ceramic fiber is 0.05 mm-1 mm. The chopped ceramic fibers are selected from one or more of magnesium silicate fibers, aluminum oxide fibers, zirconium-containing ceramic fibers, chromium-containing ceramic fibers and soluble ceramic fibers, and are preferably zirconium-containing ceramic fibers or soluble ceramic fibers.
The source of the chopped ceramic fibers is not particularly limited in the present invention and may be generally commercially available or self-prepared. In the present invention, the preparation of the chopped ceramic fibers is preferably carried out as follows:
the ceramic fiber is crushed and deslagging, and the chopped ceramic fiber with the fiber length of 0.05 mm-1 mm is prepared.
The inorganic bonding agent is selected from silica sol, and the solid content of the inorganic bonding agent is 10-40%, preferably 20-30%.
The refractory filler is selected from one or more of silica micropowder, alumina powder, kyanite powder, wollastonite powder, kaolin and attapulgite, and is preferably silica micropowder or kyanite powder.
In the invention, the mass ratio of the solid content of the ceramic fiber and the inorganic binder to the refractory filler is (2.0-5.5): (0.5-1.5): 3.5-6.5, preferably (3.0-4.5): 0.7-1.2): 4.5-5.5.
The raw material for preparing the high-density ceramic fiber board also comprises a filter aid, wherein the filter aid is selected from pregelatinized starch, and the using amount of the filter aid accounts for 4-10%, preferably 6-8% of the total mass of the ceramic fiber, the solid content of the inorganic binder and the refractory filler.
The density of the high-density ceramic fiber board provided by the invention is 600kg/m3～1000kg/m3The compression strength is as high as 10MPa, and the use temperature can reach more than 1000 ℃.
The invention also provides a preparation method of the high-density ceramic fiber board, which comprises the following steps:
A) mixing the short-cut ceramic fibers, the inorganic bonding agent, the refractory filler and water to obtain mixed slurry;
B) mixing the mixed slurry with a filter aid, and flocculating to obtain flocculated slurry;
C) and pressing, molding and drying the flocculated slurry to obtain the high-density ceramic fiberboard.
The invention firstly mixes the short-cut ceramic fiber, the inorganic bonding agent, the refractory filler and water to obtain the mixed slurry.
Specifically, the chopped ceramic fibers, the inorganic bonding agent and the refractory filler are sequentially added into water according to the proportion and uniformly mixed to prepare the slurry with the concentration of 1-10%. The concentration of the slurry is preferably 3% to 7%.
And after the mixed slurry is obtained, mixing the mixed slurry with a filter aid, and flocculating to obtain flocculated slurry. Namely, filter aid is added into the uniformly mixed slurry to assist filtration, so that the chopped ceramic fibers, the refractory filler and the inorganic binder are flocculated together, water is clear, and flocculated slurry is obtained.
And then, pressing, forming and drying the flocculated slurry to obtain the high-density ceramic fiber board.
In the invention, the pressing is formed by adopting a fourdrinier forming device or a vacuum suction filtering device. After pressing, wet blanks with corresponding thickness and density are obtained, so that the wet blanks can be ensured to reach 600kg/m after being dried3～1000kg/m3。
And finally, drying the wet blank to obtain the high-density ceramic fiber board. The drying temperature is preferably 80-140 ℃, and more preferably 90-130 ℃; the drying time is preferably 8 to 16 hours, and more preferably 10 to 14 hours.
According to the invention, the density of the product after molding is improved by chopping the ceramic fiber, the use amount of the refractory filler is increased, and the filter aid is preferably used, so that the product not only can easily reach high density, but also the strength of the ceramic fiber board is increased, and the filler can be completely flocculated on the fiber, and good water filtration can be realized in the molding process.
The results show that the bulk density of the high-density ceramic fiber board provided by the invention is up to 1000Kg/m3The compression strength is up to 10MPa, and the use temperature can reach more than 1000 ℃.
For further understanding of the present invention, the high density ceramic fiber board and the method for manufacturing the same according to the present invention are described below with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Example 1
(1) The zirconium-containing ceramic fiber is crushed and deslagging, and the chopped zirconium-containing ceramic fiber with the fiber length of 0.05 mm-1 mm is prepared.
(2) 100Kg of chopped zirconium-containing ceramic fiber, 150Kg of silica sol with the concentration of 30 percent and 250Kg of silica micropowder are sequentially added into water and uniformly mixed to prepare slurry with the concentration of 7 percent.
(3) 30Kg of pregelatinized starch is added to the uniformly mixed slurry, so that the pregelatinized starch is uniformly mixed in the slurry and the components in the slurry are flocculated together.
(4) And (3) forming the flocculated slurry by using a vacuum suction filtration device, pressing the formed slurry into a wet blank with corresponding thickness and density, conveying the wet blank into a drying chamber for drying, wherein the drying temperature is 105 ℃, the drying time is 12 hours, and preparing a product after drying.
The volume density of the manufactured high-density zirconium-containing ceramic fiber board body is 950Kg/m3The compression strength is 8.2MPa, the average thermal conductivity at 500 ℃ is 0.113 w/(m.k), and the heating permanent line change is-0.3% at 1000 ℃ of × 24 h.
Example 2
(1) The soluble ceramic fiber is crushed and deslagged to prepare the short soluble ceramic fiber with the fiber length of 0.05 mm-1 mm.
(2) 200Kg of chopped soluble ceramic fiber, 120Kg of 30% silica sol and 150Kg of kyanite powder are sequentially added into water and uniformly mixed to prepare 5% slurry.
(3) 25Kg of pregelatinized starch was added to the uniformly mixed slurry to allow uniform mixing and flocculation of the components in the slurry.
(4) And (3) forming the flocculated slurry by using a vacuum suction filtration device, pressing the formed slurry into a wet blank with corresponding thickness and density, conveying the wet blank into a drying chamber for drying, wherein the drying temperature is 90 ℃, the drying time is 13 hours, and preparing a product after drying.
The volume density of the manufactured high-density soluble ceramic fiber board body is 650Kg/m3The compression strength is 1.5MPa, the average thermal conductivity at 500 ℃ is 0.099 w/(m.k), and the heating permanent line change is-2.1% at 1000 ℃ of × 24 h.
Example 3
(1) Crushing and deslagging the aluminum silicate fiber to prepare the short-cut aluminum silicate fiber with the fiber length of 0.05 mm-1 mm.
(2) 200Kg of chopped aluminum silicate fiber, 160Kg of 30 percent silica sol and 300Kg of alumina powder are sequentially added into water and evenly mixed to prepare slurry with the concentration of 8 percent.
(3) 40Kg of pregelatinized starch was added to the uniformly mixed slurry to allow uniform mixing and flocculation of the components in the slurry.
(4) And (3) forming the flocculated slurry by using a vacuum suction filtration device, pressing the formed slurry into a wet blank with corresponding thickness and density, conveying the wet blank into a drying chamber for drying, wherein the drying temperature is 120 ℃, the drying time is 8 hours, and preparing a product after drying.
The volume density of the prepared high-density aluminum silicate fiberboard is 800Kg/m3The compression strength is 7.5MPa, the average thermal conductivity at 500 ℃ is 0.102 w/(m.k), and the heating permanent line change is-0.8% at 1000 ℃ of × 24 h.
Example 4
(1) The magnesium silicate fiber is crushed and deslagged to prepare the short-cut magnesium silicate fiber with the fiber length of 0.05 mm-1 mm.
(2) 200Kg of chopped magnesium silicate fiber, 180Kg of 30% silica sol and 130Kg of kaolin are sequentially added into water and mixed evenly to prepare 5% slurry.
(3) 25Kg of pregelatinized starch was added to the uniformly mixed slurry to allow uniform mixing and flocculation of the components in the slurry.
(4) And (3) the flocculated slurry is taken by a long net, molded and pressed into a wet blank with corresponding thickness and density, and the wet blank is conveyed into a drying chamber for drying at the drying temperature of 140 ℃ for 8 hours, so that a product is prepared after drying.
The bulk density of the high-density magnesium silicate fiber board body is 600Kg/m3The compression strength is 1.1MPa, the average thermal conductivity at 500 ℃ is 0.090 w/(m.k), and the heating permanent line change is-2.8% at 1000 ℃ and × 24 h.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The high-density ceramic fiberboard is characterized by being prepared from short-cut ceramic fibers, an inorganic bonding agent, a refractory filler and a filter aid, wherein the mass ratio of the solid contents of the ceramic fibers and the inorganic bonding agent to the refractory filler is (2.0-5.5) to (0.5-1.5) to (3.5-6.5), the mass of the filter aid accounts for 4-10% of the total mass of the solid contents of the ceramic fibers and the inorganic bonding agent and the refractory filler, and the filter aid is selected from pregelatinized starch;
the length of the short-cut ceramic fiber is 0.05 mm-1 mm;
the inorganic bonding agent is silica sol, and the solid content of the inorganic bonding agent is 10-40%;
the density of the high-density ceramic fiber board is 600kg/m3～1000kg/m3。
2. The high density ceramic fiberboard of claim 1, wherein the chopped ceramic fibers are selected from one or more of magnesium silicate fibers, aluminum silicate fibers, alumina fibers, zirconium-containing ceramic fibers, chromium-containing ceramic fibers, and soluble ceramic fibers.
3. The high-density ceramic fiberboard of claim 1, wherein the refractory filler is selected from one or more of silica micropowder, alumina powder, kyanite powder, wollastonite powder, kaolin, and attapulgite.
4. A method for preparing a high-density ceramic fiber sheet according to any one of claims 1 to 3, comprising the steps of:
A) mixing the short-cut ceramic fibers, the inorganic bonding agent, the refractory filler and water to obtain mixed slurry;
B) mixing the mixed slurry with a filter aid, and flocculating to obtain flocculated slurry;
C) and pressing, molding and drying the flocculated slurry to obtain the high-density ceramic fiberboard.
5. The method according to claim 4, wherein the concentration of the mixed slurry is 1% to 10%.
6. The method of claim 4, wherein the forming is performed by a fourdrinier wire forming apparatus or a vacuum filtration apparatus.
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