CN107337429B - Preparation method of ceramic curtain wall and foamed ceramic composite material - Google Patents

Preparation method of ceramic curtain wall and foamed ceramic composite material Download PDF

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CN107337429B
CN107337429B CN201710476856.XA CN201710476856A CN107337429B CN 107337429 B CN107337429 B CN 107337429B CN 201710476856 A CN201710476856 A CN 201710476856A CN 107337429 B CN107337429 B CN 107337429B
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curtain
blank
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composite
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殷海荣
王飞
白建光
张森
汪枫帆
田一冲
李明阳
高杨
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Shaanxi University of Science and Technology
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Abstract

The invention discloses a ceramic curtain wall and a preparation method of a foamed ceramic composite material, wherein PVA is added into a foamed ceramic mixture and a ceramic curtain wall mixture for granulation to respectively obtain foamed ceramic granules and ceramic curtain wall granules, then the foamed ceramic granules and the ceramic curtain wall granules are respectively subjected to semi-dry pressing forming to obtain a foamed ceramic blank and a ceramic curtain wall blank, the foamed ceramic blank and the ceramic curtain wall blank are dried, and the dried foamed ceramic blank is placed on the top surface of the dried ceramic curtain wall blank to ensure that the bonding surface of the foamed ceramic blank and the ceramic curtain wall blank is smooth and flat and is in full contact with each other to obtain a composite blank; and then, keeping the temperature of the composite blank at 120 ℃ for 12h, heating to 1100-phase 1150 ℃ for foaming, cooling to 600 ℃ after foaming, keeping the temperature for 4h, and cooling along with a furnace to obtain the ceramic curtain wall and the foamed ceramic composite material. The invention adopts the method of simultaneously sintering the foamed ceramic and the ceramic curtain wall, has simple composite process, and can greatly reduce energy consumption and cost.

Description

Preparation method of ceramic curtain wall and foamed ceramic composite material
Technical Field
The invention belongs to the field of solid waste recycling and building material preparation, and particularly relates to a preparation method of a ceramic curtain wall and a foamed ceramic composite material.
Background
The ceramic curtain wall is a new type of building curtain wall material, and has the advantages of wind pressure deformation resistance, shock resistance, fire resistance, beautiful appearance and the like. Most of the raw materials of the ceramic curtain wall are natural raw materials, and in recent years, the research on preparing the ceramic curtain wall by using solid wastes as the raw materials is more and more. Patent CN103896556A discloses a novel environment-friendly energy-saving curtain wall material made of sludge and waste ceramics and a preparation method thereof. Ceramic curtain walls are often used in conjunction with foam materials such as foam glass, foam ceramic, and the like. The foamed ceramic is a novel building outer wall and roof heat insulation material, the raw materials are mainly natural raw materials, and the preparation of the foamed ceramic by adopting various solid wastes as the raw materials is also an important research direction. Patent CN104496535A discloses a preparation method of foamed ceramic by taking silica sand tailings and fly ash as main raw materials, wherein the content of the silica sand tailings is 25-45%; patent CN103396157A discloses a preparation method of foamed ceramic for buildings, wherein the usage amount of iron tailings reaches 50-55%; the patent CN102417368A adopts high-silicon iron tailings as raw materials to prepare foamed ceramics, wherein the use amount of the iron tailings reaches 60-70%.
There are many kinds of methods for combining the ceramic curtain wall and the foam material. The current common method is to use cement to solidify the foam glass or the foam ceramic on the surface of the ceramic curtain wall or the ceramic material. However, the higher water absorption and lower bonding strength of cement have a great limiting effect on the use of composite materials. Patent CN105315013A discloses a method for preparing composite material by using contact bonding with the bottom of a ceramic plate in the volume expansion process of foam glass during foaming, but the process is more complicated, the yield is not high, and the energy consumption is also large; the matching of the two properties must also be considered in the formulation process.
From the aspects of formula composition, mixing mode and sintering process, the foamed ceramic and the ceramic curtain wall have a plurality of same places, so that the method for directly placing the foamed ceramic batch on the surface of the ceramic curtain wall and then directly sintering the foamed ceramic batch undoubtedly has higher research significance.
Disclosure of Invention
The invention aims to provide a ceramic curtain wall and a preparation method of a foamed ceramic composite material, which aim to overcome the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a ceramic curtain wall and a foamed ceramic composite material comprises the following steps:
the method comprises the following steps: adopting iron tailings, flat plate waste glass powder and silicon carbide powder as foam ceramic ingredients, adopting the iron tailings, Suzhou soil and ceramic waste materials as ceramic curtain wall ingredients, and respectively mixing the foam ceramic ingredients and the ceramic curtain wall ingredients to obtain a foam ceramic mixture and a ceramic curtain wall mixture;
step two: respectively adding PVA solution into the foamed ceramic mixture and the ceramic curtain wall mixture for granulation to respectively obtain foamed ceramic granules and ceramic curtain wall granules, and then respectively carrying out semi-dry pressing on the foamed ceramic granules and the ceramic curtain wall granules to obtain a foamed ceramic blank body and a ceramic curtain wall blank body;
step three: drying the foamed ceramic blank and the ceramic curtain wall blank, placing the dried foamed ceramic blank on the top surface of the dried ceramic curtain wall blank, and ensuring that the bonding surface of the foamed ceramic blank and the ceramic curtain wall blank is smooth and flat and is in full contact with each other to obtain a composite blank; and then, keeping the temperature of the composite blank at 120 ℃ for 12h, heating to 1100-phase 1150 ℃ for foaming, cooling to 600 ℃ after foaming, keeping the temperature for 4h, and cooling along with a furnace to obtain the ceramic curtain wall and the foamed ceramic composite material.
Further, the foamed ceramic material comprises 75-80% of iron tailings, 19-24% of flat plate waste glass powder and 1% of silicon carbide powder in percentage by mass.
Further, the ceramic curtain wall ingredients comprise, by mass, 70-75% of iron tailings, 10-15% of Suzhou soil and 10-15% of ceramic waste.
And further, mixing the foamed ceramic ingredients and the ceramic curtain wall ingredients respectively by using a roller ball mill in the step one to obtain foamed ceramic mixture and ceramic curtain wall mixture.
Further, the mass concentration of the PVA solution is 5%, and the amounts of the PVA solution added into the foamed ceramic mixture and the ceramic curtain wall mixture respectively account for 2% -2.5% of the masses of the foamed ceramic mixture and the ceramic curtain wall mixture.
Further, the molding pressure in step two was 2.5 tons.
Furthermore, the sizes of the foamed ceramic blank and the ceramic curtain wall blank are both 30mm multiplied by 20 mm.
Further, the heating rate in the third step is 25 ℃/min.
Further, the foaming time in step three is 30 min.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention adopts the iron tailings and the plate waste glass powder as main raw materials, and proper amount of silicon carbide powder is added as a foaming agent to prepare the foamed ceramic, the iron tailings, Suzhou soil and ceramic waste are adopted as raw materials for the ceramic curtain wall, the utilization rate of the iron tailings of the two products is higher, and the purpose of recycling the tailings is achieved; the invention adopts the method of simultaneously sintering the foamed ceramic and the ceramic curtain wall, has simple composite process and higher composite strength, and can also greatly reduce energy consumption and cost.
Furthermore, the ceramic curtain wall and the foamed ceramic composite material prepared by the method have lower thermal conductivity by controlling the process conditions; the foamed ceramic has lower density and higher compressive strength; the ceramic curtain wall has the advantages of low density, low water absorption and high bending strength.
Drawings
FIG. 1 is a diagram of a sample of a typical ceramic curtain wall and ceramic foam composite.
Detailed Description
Embodiments of the invention are described in further detail below:
a preparation method of a ceramic curtain wall and a foamed ceramic composite material comprises the following steps:
the method comprises the following steps: adopting 75-80 wt.% of iron tailings and 19-24 wt.% of flat plate waste glass powder as main raw materials, and taking 1 wt.% of silicon carbide powder as a foaming agent as a raw material of foamed ceramic; adopting 70-75 wt.% of iron tailings, 10-15 wt.% of Suzhou soil and 10-15 wt.% of ceramic waste as raw materials of a ceramic curtain wall, and respectively mixing the two raw materials by adopting a roller ball mill;
respectively adding 5 wt.% of PVA solution into the mixed powder for granulation, wherein the amount of PVA added into the foamed ceramic mixture and the ceramic curtain wall mixture respectively accounts for 2-2.5% of the mass of the foamed ceramic mixture and the ceramic curtain wall mixture, and then performing semi-dry pressing to obtain a blank body, wherein the forming pressure is 2.5 tons, and the size of the blank body is 30 × 30, 30 × 20mm and 20mm3Placing the foamed ceramic blank on the top surface of the ceramic curtain wall blank with the same size after drying, and ensuring that the combined surface of the foamed ceramic blank and the ceramic curtain wall blank is smooth and flat and is in full contact;
step three: and (3) keeping the temperature of the composite blank at 120 ℃ for 12h, heating to 1100-phase 1150 ℃ for high-temperature foaming at the heating rate of 25 ℃/min for 30min, cooling to 600 ℃ after foaming, keeping the temperature for 4h, cooling along with the furnace, and cutting to obtain the ceramic curtain wall and the foamed ceramic composite material.
The present invention is described in further detail below with reference to examples:
example 1
The method comprises the following steps: 75 wt.% of iron tailings and 24 wt.% of flat waste glass powder are used as main raw materials, and 1 wt.% of silicon carbide powder is used as a foaming agent as a raw material of the foamed ceramic; adopting 70 wt.% of iron tailings, 15 wt.% of Suzhou soil and 15 wt.% of ceramic waste as raw materials of a ceramic curtain wall, and respectively mixing the two raw materials by adopting a roller ball mill;
respectively adding 5 wt.% of PVA solution into the mixed powder for granulation, wherein the amount of PVA added into the foamed ceramic mixture and the ceramic curtain wall mixture respectively accounts for 2% of the mass of the foamed ceramic mixture and the ceramic curtain wall mixture, and then performing semi-dry pressing to obtain a blank body, wherein the forming pressure is 2.5 tons, and the size of the blank body is 30 × 30, 30 × 20mm3Placing the foamed ceramic blank on the top surface of the ceramic curtain wall blank with the same size after drying, and ensuring that the combined surface of the foamed ceramic blank and the ceramic curtain wall blank is smooth and flat and is in full contact;
step three: keeping the temperature of the composite blank at 120 ℃ for 12h, heating to 1100 ℃ for high-temperature foaming for 30min, wherein the heating rate isCooling to 600 ℃ after foaming is finished, preserving heat for 4 hours at the temperature of 25 ℃/min, and then cooling along with a furnace and cutting to obtain the ceramic curtain wall and the foamed ceramic composite material. The density of the foamed ceramic is 0.514g.cm-3The compressive strength is 13.13 MPa; the density of the ceramic curtain wall is 2.037g.cm-3The water absorption rate is 10 percent, and the bending strength is 13.5 MPa; the heat conductivity coefficient of the prepared ceramic curtain wall and foamed ceramic composite material is 0.0526w/m ∙ k.
Example 2
The method comprises the following steps: 76 wt.% of iron tailings and 23 wt.% of flat waste glass powder are used as main raw materials, and 1 wt.% of silicon carbide powder is used as a foaming agent as a raw material of the foamed ceramic; adopting 71 wt.% of iron tailings, 14 wt.% of Suzhou soil and 15 wt.% of ceramic waste as raw materials of the ceramic curtain wall, and respectively adopting a roller ball mill to mix the two raw materials;
respectively adding 5 wt.% of PVA solution into the mixed powder for granulation, wherein the amount of PVA added into the foamed ceramic mixture and the ceramic curtain wall mixture respectively accounts for 2.5% of the mass of the foamed ceramic mixture and the ceramic curtain wall mixture, and then performing semi-dry pressing to obtain a blank body, wherein the forming pressure is 2.5 tons, and the size of the blank body is 30 × 30, 30 × 20 and 20mm3Placing the foamed ceramic blank on the top surface of the ceramic curtain wall blank with the same size after drying, and ensuring that the combined surface of the foamed ceramic blank and the ceramic curtain wall blank is smooth and flat and is in full contact;
step three: and (3) keeping the temperature of the composite blank at 120 ℃ for 12h, heating to 1110 ℃ for high-temperature foaming for 30min at the heating rate of 25 ℃/min, cooling to 600 ℃ after foaming, keeping the temperature for 4h, cooling along with a furnace, and cutting to obtain the ceramic curtain wall and the foamed ceramic composite material. The density of the foamed ceramic is 0.374g.cm-3The compressive strength is 8.53 MPa; the density of the ceramic curtain wall is 2.145g.cm-3The water absorption rate is 8.6 percent, and the bending strength is 14 MPa; the prepared ceramic curtain wall and foamed ceramic composite material have the heat conductivity coefficient of 0.0981w/m ∙ k.
Example 3
The method comprises the following steps: 77 wt.% of iron tailings and 22 wt.% of flat waste glass powder are used as main raw materials, and 1 wt.% of silicon carbide powder is used as a foaming agent as a raw material of the foamed ceramic; adopting 73 wt.% of iron tailings, 12 wt.% of Suzhou soil and 15 wt.% of ceramic waste as raw materials of the ceramic curtain wall, and respectively mixing the two raw materials by adopting a roller ball mill;
respectively adding 5 wt.% of PVA solution into the mixed powder for granulation, wherein the amount of PVA added into the foamed ceramic mixture and the ceramic curtain wall mixture respectively accounts for 2.2% of the mass of the foamed ceramic mixture and the ceramic curtain wall mixture, and then performing semi-dry pressing to obtain a blank body, wherein the forming pressure is 2.5 tons, and the size of the blank body is 30 × 30, 30 × 20 and 20mm3Placing the foamed ceramic blank on the top surface of the ceramic curtain wall blank with the same size after drying, and ensuring that the combined surface of the foamed ceramic blank and the ceramic curtain wall blank is smooth and flat and is in full contact;
step three: and (3) keeping the temperature of the composite blank at 120 ℃ for 12h, heating to 1120 ℃ for high-temperature foaming for 30min at the heating rate of 25 ℃/min, cooling to 600 ℃ after foaming, keeping the temperature for 4h, cooling along with a furnace, and cutting to obtain the ceramic curtain wall and foamed ceramic composite material. The density of the foamed ceramic is 0.313g.cm-3The compressive strength is 7.60 MPa; the density of the ceramic curtain wall is 2.248g.cm-3The water absorption rate is 8 percent, and the bending strength is 14.7 MPa; the heat conductivity coefficient of the prepared ceramic curtain wall and the prepared foamed ceramic composite material is 0.1124w/m ∙ k.
Example 4
The method comprises the following steps: 78 wt.% of iron tailings and 21 wt.% of flat waste glass powder are used as main raw materials, and 1 wt.% of silicon carbide powder is used as a foaming agent as a raw material of the foamed ceramic; taking 75 wt.% of iron tailings, 15 wt.% of Suzhou soil and 10 wt.% of ceramic waste as raw materials of the ceramic curtain wall, and respectively mixing the two raw materials by adopting a roller ball mill;
respectively adding 5 wt.% of PVA solution into the mixed powder for granulation, wherein the amount of PVA added into the foamed ceramic mixture and the ceramic curtain wall mixture respectively accounts for 2.4% of the mass of the foamed ceramic mixture and the ceramic curtain wall mixture, and then performing semi-dry pressing to obtain a blank body, wherein the forming pressure is 2.5 tons, and the size of the blank body is 30 × 30, 30 × 20 and 20mm3Placing the foamed ceramic blank on the top surface of the ceramic curtain wall blank with the same size after drying, and ensuring that the combined surface of the foamed ceramic blank and the ceramic curtain wall blank is smooth and flat and is in full contact;
step three: combining the composite blankAnd (3) keeping the temperature of the body at 120 ℃ for 12h, heating to 1130 ℃ for high-temperature foaming for 30min at the heating rate of 25 ℃/min, cooling to 600 ℃ after foaming, keeping the temperature for 4h, cooling along with a furnace, and cutting to obtain the ceramic curtain wall and the foamed ceramic composite material. The density of the foamed ceramic is 0.285g.cm-3The compressive strength is 5.00 MPa; the density of the ceramic curtain wall is 2.298g.cm-3Water absorption of 7.6 percent and bending strength of 15.2 MPa; the prepared ceramic curtain wall and foamed ceramic composite material have the heat conductivity coefficient of 0.1082w/m ∙ k.
Example 5
The method comprises the following steps: 79 wt.% of iron tailings and 20 wt.% of flat waste glass powder are used as main raw materials, and 1 wt.% of silicon carbide powder is used as a foaming agent as a raw material of the foamed ceramic; taking 75 wt.% of iron tailings, 10 wt.% of Suzhou soil and 15 wt.% of ceramic waste as raw materials of the ceramic curtain wall, and respectively mixing the two raw materials by adopting a roller ball mill;
respectively adding 5 wt.% of PVA solution into the mixed powder for granulation, wherein the amount of PVA added into the foamed ceramic mixture and the ceramic curtain wall mixture respectively accounts for 2.3% of the mass of the foamed ceramic mixture and the ceramic curtain wall mixture, and then performing semi-dry pressing to obtain a blank body, wherein the forming pressure is 2.5 tons, and the size of the blank body is 30 × 30, 30 × 20 and 20mm3Placing the foamed ceramic blank on the top surface of the ceramic curtain wall blank with the same size after drying, and ensuring that the combined surface of the foamed ceramic blank and the ceramic curtain wall blank is smooth and flat and is in full contact;
step three: and (3) keeping the temperature of the composite blank at 120 ℃ for 12h, heating to 1140 ℃ for high-temperature foaming for 30min at the heating rate of 25 ℃/min, cooling to 600 ℃ after foaming, keeping the temperature for 4h, cooling along with a furnace, and cutting to obtain the ceramic curtain wall and the foamed ceramic composite material. The density of the foamed ceramic is 0.353g.cm-3The compressive strength is 4.01 MPa; the density of the ceramic curtain wall is 2.448g.cm-3The water absorption rate is 6 percent, and the bending strength is 14.1 MPa; the prepared ceramic curtain wall and foamed ceramic composite material have the heat conductivity coefficient of 0.0992w/m ∙ k.
Example 6
The method comprises the following steps: 80 wt.% of iron tailings and 19 wt.% of flat waste glass powder are used as main raw materials, and 1 wt.% of silicon carbide powder is used as a foaming agent as a raw material of the foamed ceramic; adopting 74 wt.% of iron tailings, 13 wt.% of Suzhou soil and 13 wt.% of ceramic waste as raw materials of a ceramic curtain wall, and respectively mixing the two raw materials by adopting a roller ball mill;
respectively adding 5 wt.% of PVA solution into the mixed powder for granulation, wherein the amount of PVA added into the foamed ceramic mixture and the ceramic curtain wall mixture respectively accounts for 2.5% of the mass of the foamed ceramic mixture and the ceramic curtain wall mixture, and then performing semi-dry pressing to obtain a blank body, wherein the forming pressure is 2.5 tons, and the size of the blank body is 30 × 30, 30 × 20 and 20mm3Placing the foamed ceramic blank on the top surface of the ceramic curtain wall blank with the same size after drying, and ensuring that the combined surface of the foamed ceramic blank and the ceramic curtain wall blank is smooth and flat and is in full contact;
step three: and (3) keeping the temperature of the composite blank at 120 ℃ for 12h, heating to 1150 ℃ for high-temperature foaming for 30min at the heating rate of 25 ℃/min, cooling to 600 ℃ after foaming, keeping the temperature for 4h, cooling along with a furnace, and cutting to obtain the ceramic curtain wall and the foamed ceramic composite material. The density of the foamed ceramic is 0.426g.cm-3The compressive strength is 1.06 MPa; the density of the ceramic curtain wall is 2.448g.cm-3The water absorption rate is 6 percent, and the bending strength is 14.1 MPa; the prepared ceramic curtain wall and foamed ceramic composite material have the heat conductivity coefficient of 0.0731w/m ∙ k.

Claims (7)

1. A preparation method of a ceramic curtain wall and a foamed ceramic composite material is characterized by comprising the following steps:
the method comprises the following steps: adopting iron tailings, flat plate waste glass powder and silicon carbide powder as foam ceramic ingredients, adopting the iron tailings, Suzhou soil and ceramic waste materials as ceramic curtain wall ingredients, and respectively mixing the foam ceramic ingredients and the ceramic curtain wall ingredients to obtain a foam ceramic mixture and a ceramic curtain wall mixture; the foamed ceramic comprises, by mass, 75-80% of iron tailings, 19-24% of flat plate waste glass powder and 1% of silicon carbide powder; the ceramic curtain wall comprises 70-75% of iron tailings, 10-15% of Suzhou soil and 10-15% of ceramic waste;
step two: respectively adding PVA solution into the foamed ceramic mixture and the ceramic curtain wall mixture for granulation to respectively obtain foamed ceramic granules and ceramic curtain wall granules, and then respectively carrying out semi-dry pressing on the foamed ceramic granules and the ceramic curtain wall granules to obtain a foamed ceramic blank body and a ceramic curtain wall blank body;
step three: drying the foamed ceramic blank and the ceramic curtain wall blank, placing the dried foamed ceramic blank on the top surface of the dried ceramic curtain wall blank, and ensuring that the bonding surface of the foamed ceramic blank and the ceramic curtain wall blank is smooth and flat and is in full contact with each other to obtain a composite blank; and then, keeping the temperature of the composite blank at 120 ℃ for 12h, heating to 1100-phase 1150 ℃ for foaming, cooling to 600 ℃ after foaming, keeping the temperature for 4h, and cooling along with a furnace to obtain the ceramic curtain wall and the foamed ceramic composite material.
2. The preparation method of the ceramic curtain wall and the foamed ceramic composite material according to claim 1, wherein in the step one, a roller ball mill is adopted to mix the foamed ceramic ingredients and the ceramic curtain wall ingredients respectively to obtain a foamed ceramic mixture and a ceramic curtain wall mixture.
3. The preparation method of the ceramic curtain wall and the foamed ceramic composite material according to claim 1, wherein the mass concentration of the PVA solution is 5%, and the amounts of the PVA solution added to the foamed ceramic mixture and the ceramic curtain wall mixture respectively account for 2-2.5% of the mass of the foamed ceramic mixture and the ceramic curtain wall mixture.
4. The method as claimed in claim 1, wherein the forming pressure in step two is 2.5 tons.
5. The method for preparing ceramic curtain wall and foamed ceramic composite material according to claim 1, wherein the sizes of the foamed ceramic blank and the ceramic curtain wall blank are both 30mm x 20 mm.
6. The method for preparing ceramic curtain wall and foamed ceramic composite material according to claim 1, wherein the heating rate in the third step is 25 ℃/min.
7. The method for preparing a ceramic curtain wall and a ceramic foam composite material according to claim 1, wherein the foaming time in the third step is 30 min.
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CN107935550A (en) * 2017-11-24 2018-04-20 陕西科技大学 A kind of preparation method of iron tailings foamed ceramics and polished bricks composite material
CN107903033A (en) * 2017-11-27 2018-04-13 陕西科技大学 A kind of method that foamed ceramics is prepared using tailing
CN113307653A (en) * 2021-05-08 2021-08-27 江西中材新材料有限公司 Foamed ceramic and preparation method thereof

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