CN113620609B - Foam glass and preparation method thereof - Google Patents
Foam glass and preparation method thereof Download PDFInfo
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- CN113620609B CN113620609B CN202110992698.XA CN202110992698A CN113620609B CN 113620609 B CN113620609 B CN 113620609B CN 202110992698 A CN202110992698 A CN 202110992698A CN 113620609 B CN113620609 B CN 113620609B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C11/00—Multi-cellular glass ; Porous or hollow glass or glass particles
- C03C11/007—Foam glass, e.g. obtained by incorporating a blowing agent and heating
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/06—Other methods of shaping glass by sintering, e.g. by cold isostatic pressing of powders and subsequent sintering, by hot pressing of powders, by sintering slurries or dispersions not undergoing a liquid phase reaction
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/08—Other methods of shaping glass by foaming
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
- C03C1/002—Use of waste materials, e.g. slags
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Abstract
The invention particularly relates to foam glass and a preparation method thereof, belonging to the technical field of comprehensive utilization of dust collecting powder, and the method comprises the following steps: carrying out free water removal treatment on the desulfurized gypsum to obtain desulfurized gypsum powder; mixing the desulfurized gypsum, the graphitized dust collecting powder and an additive to obtain a mixed powder; putting the mixed powder into a container for compression molding to obtain a blank; preheating the blank to obtain a preheated blank; heating, foaming, foam stabilizing and annealing the hot blank to obtain foam glass; the foam glass is prepared by mixing and utilizing the dust collecting powder and the desulfurized gypsum generated by the graphitization furnace, a new scheme for preparing the foam glass is provided, the problem that the solid waste is difficult to stockpile and dispose is solved, the pollution problem generated by the graphitization furnace is solved, and the purpose of comprehensive utilization of resources is achieved.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of dust collecting powder, and particularly relates to foam glass and a preparation method thereof.
Background
The foam glass is an inorganic material which is formed by taking pure raw materials or waste glass as main raw materials and a foaming agent, a cosolvent, an accelerant and the like as additives through the processes of melting, foaming, cooling and the like, and is internally filled with communicated or closed air holes. The heat-insulating, sound-absorbing, moisture-proof and fireproof building material and the decorative material have excellent performance because of the advantages of small heat conductivity coefficient, low thermal expansion coefficient, no water absorption, moisture permeation, no combustion, wide working temperature range, no insect damage, strong corrosion resistance and the like, and can be applied to the fields of medium-temperature heat insulation, heat insulation of building inner and outer walls, waterproof and moisture-proof engineering, decorative engineering, petrochemical engineering, refrigeration, underground engineering, noise elimination and the like.
The applicant finds in the course of the invention that: in the process of producing the carbon material by the graphitization furnace, elements such as sulfur, silicon, partial carbon and the like which are impurities are subjected to complex high-temperature reaction to generate a dust collection powder mixture which is recovered by a high-temperature flue gas recovery system, the main components of the dust collection powder are sodium sulfate, silicon dioxide, aluminum oxide and a small amount of other substances, about 15kg of dust collection powder can be generated when 1 ton of carbon material is produced, and the dust collection powder contains a lot of valuable components and needs to be recycled.
And current utilization techniques include: the Chinese patent application CN110668704A relates to a method for comprehensive utilization of bag-type dedusting ash and fly ash of a blast furnace, which comprises the steps of taking 70-85 parts by mass of bag-type dedusting ash, 15-30 parts by mass of fly ash and 0.3-1 part by mass of binder as raw materials, adjusting the mixing ratio, granulating and pelletizing the mixture, putting the pellets into a submerged arc furnace to generate molten iron and slag, discharging the molten iron and casting the molten iron into iron blocks, throwing wires after discharging the slag to prepare slag wool, fully utilizing heat energy, realizing utilization of two industrial solid wastes by one-time smelting, and finally obtaining two products of the iron blocks and the slag wool.
Chinese patent application CN 111186851A discloses a method for recovering electric dust-collecting powder from fluidized bed roasting to prepare modified aluminum-based catalyst. Placing the electric dust collection powder of the fluidized bed roaster in an alkaline solution for heating reaction, obtaining filtrate through solid-liquid separation, dropwise adding acid liquor into the filtrate, and reacting under the conditions of controlling the pH value to be 6-10 and the temperature to be 50-70 ℃ to obtain a liquid-solid mixture; aging the liquid-solid mixture at 80-90 deg.C to obtain material, washing with ammonia water for 3-5 times to obtain A1 (OH)3And (4) burning the crystal to obtain the target modified aluminum-based catalyst. The electric dust collection powder of the fluidized bed roaster is comprehensively recycled and converted into the aluminum-based catalyst with high added value, so that the electric dust collection powder of the fluidized bed roaster can be recycled, an aluminum-based catalyst product with high added value can be obtained, and the problem of environmental pollution caused by the electric dust collection powder of the fluidized bed roaster is solved.
The Chinese patent application CN 103304221A discloses a method for preparing valuable porcelain balls by using alumina dust-collecting powder, belonging to the technical field of new materials. Alumina dust collecting powder is used in a large amount in the formula. The cost is reduced, simultaneously, waste materials are used for protecting the environment, magnesia-alumina spinel and mullite with the enhancement function are formed, and the thermal shock resistance and the strength are improved. A small amount of kaolin is added in the formula to increase the plasticity of the blank, so that the forming is facilitated. Meanwhile, the continuous dry ball milling process is adopted to reduce high energy consumption. The prepared emotional ceramic ball has the characteristics of high temperature resistance, high strength, good thermal shock resistance and the like, has excellent comprehensive performance, and is completely suitable for the requirements of various industries on the refiner carrier and the support performance.
Disclosure of Invention
The application aims to provide a foam glass and a preparation method thereof, and provide a new recycling way of graphitized dust collection powder, so that the problem of solid waste accumulation caused by the dust collection powder of a graphitizing furnace is solved, and the reutilization of desulfurized gypsum is realized at the same time
The embodiment of the invention provides a preparation method of foam glass, which comprises the following steps:
carrying out free water removal treatment on the desulfurized gypsum to obtain desulfurized gypsum powder;
mixing the desulfurized gypsum, the graphitized dust collecting powder and an additive to obtain a mixed powder;
putting the mixed powder into a container for compression molding to obtain a blank;
preheating the blank to obtain a preheated blank;
heating, foaming, foam stabilizing and annealing the hot blank to obtain foam glass;
the mixed powder comprises the following components in parts by mass: 2-6 parts of desulfurized gypsum, 89-97 parts of graphitized dust collection powder and 1-5 parts of additive.
Optionally, the additive comprises Al in mass2O3、K2O、Fe2O3CaO, mgO and TiO2And the like.
Optionally, the termination conditions of the free water removal treatment are as follows: the water content of the desulfurized gypsum is less than 3 percent by mass
Optionally, the method further includes: subjecting the container to a pretreatment comprising: and (3) smearing volatile organic substances on the inner wall of the container, and then smearing carbon powder to finish pretreatment.
Optionally, the temperature rise rate of the preheating is 5-7 ℃/min, the end point temperature of the preheating is 400-500 ℃, and the heat preservation time of the preheating is 50-70min.
Optionally, the temperature rise speed of the temperature rise is 13-17 ℃/min.
Optionally, the foaming temperature is 1250-1350 ℃, and the foaming time is 50-70min.
Optionally, in the foam stabilizing process, the preheated blank is cooled to 550-650 ℃ at a cooling speed of 9-11 ℃/min.
Optionally, in the annealing process, the preheated blank is subjected to heat preservation at 550-650 ℃ for 20-40min.
Based on the same inventive concept, the embodiment of the invention also provides the foam glass which is prepared by adopting the preparation method of the foam glass.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
the preparation method of the foam glass provided by the embodiment of the invention comprises the following steps: carrying out free water removal treatment on the desulfurized gypsum to obtain desulfurized gypsum powder; mixing the desulfurized gypsum, the graphitized dust collecting powder and an additive to obtain a mixed powder; putting the mixed powder into a container for compression molding to obtain a blank; preheating the blank to obtain a preheated blank; heating, foaming, foam stabilizing and annealing the hot blank to obtain foam glass; the mixed powder comprises the following components in parts by mass: 2-6 parts of desulfurized gypsum, 89-97 parts of graphitized dust collection powder and 1-5 parts of additive; the foam glass is prepared by mixing and utilizing the dust collecting powder and the desulfurized gypsum generated by the graphitization furnace, a new scheme for preparing the foam glass is provided, the problem that the solid waste is difficult to stockpile and dispose is solved, the pollution problem generated by the graphitization furnace is solved, and the purpose of comprehensive utilization of resources is achieved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a method provided by an embodiment of the present invention;
FIG. 2 is a block diagram of a method provided by an embodiment of the invention;
reference numerals in fig. 2: w1-desulfurized gypsum; w22-dust collection powder; w11-anhydrous desulfurized gypsum; w23-additive; w3-mixing material; w4-mixing the treated mixture; w5-hot mixing; w6-melting the solid-liquid mixture; w7-high temperature liquid material; w8-molten glass; w9-foam glass; w10-foam glass.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are illustrative of the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
according to an exemplary embodiment of the present invention, there is provided a method of manufacturing a foam glass, the method including:
s1, carrying out free water removal treatment on desulfurized gypsum to obtain desulfurized gypsum powder;
as an alternative example, the treatment of the free water removal should ensure that the desulfurized gypsum is uniformly powdered, and generally speaking, the desulfurized gypsum powder has a water content of 3% by mass or less.
S2, mixing the desulfurized gypsum, the graphitized dust collecting powder and an additive to obtain mixed powder, wherein the mixed material must be uniform in order to ensure uniform foaming; the mixed powder comprises the following components in parts by mass: 2-6 parts of desulfurized gypsum, 89-97 parts of graphitized dust collecting powder and 1-5 parts of additive;
the graphitized dust collecting powder is used as a raw material for preparation, and 89-97 parts of the graphitized dust collecting powder is controlled. Preferably, the mass part of the dust collecting powder of the graphitization furnace is 94 parts.
The desulfurized gypsum is used as a foaming agent, and the reason for controlling 2-6 parts of desulfurized gypsum is to ensure the porosity of the foam glass, the adverse effect of overlarge mass part is that the porosity is overlarge and unstable, and the adverse effect of undersize is that the porosity is low. Preferably, the mass part of the desulfurized gypsum is 4 parts.
The additive has the function of fluxing, the reason for controlling the additive by 1-5 parts is to ensure the uniform melting of the foam glass, the adverse effect of overlarge mass part is forming, and the adverse effect of undersize cannot achieve the fluxing effect. Preferably, the mass part of the additive is 2 parts; specifically, the additive comprises Al as a component by mass2O3、K2O、Fe2O3CaO, mgO and TiO2。
S3, placing the mixed powder in a container for compression molding to obtain a blank;
in order to ensure that the container does not stick to the wall, the container is also required to be pretreated, specifically, the container adopts a corundum crucible, and the pretreatment operation comprises the following steps: the inner wall of the corundum crucible is coated with vaseline or other volatile organic substances, and then a layer of carbon powder is coated, so that the corundum crucible is prevented from being adhered after being fired;
s4, preheating the blank to obtain a preheated blank;
specifically, the blank is put into a furnace body, in order to ensure that the batch is uniformly heated, the heating rate cannot be too high, and the melt cannot be uniformly melted due to too high heating rate, the temperature is slowly increased to 400-500 ℃ at the speed of 5-7 ℃/min, the temperature is kept for 50-70min, and the preferred temperature keeping time is 60min, wherein the process is mainly to remove chemically bound water and adsorbed water in the batch.
S5, heating, foaming, foam stabilizing and annealing the hot blank to obtain foam glass;
after preheating is finished, the test strip needs to be heated to the foaming temperature quickly, in the temperature rising process, a part of foaming agent begins to decompose to generate gas, the purpose of quickly raising the temperature is to reduce the decomposition of the foaming agent in the process, and through the expansion and quick softening of the batch materials in the process, as much gas phase as possible is wrapped in the batch materials without escaping, so that sufficient gas is ensured in foaming. In the temperature rise process, the temperature rise speed is 15 ℃/min.
The foaming temperature is controlled at 1250-1350 ℃, the foaming time is controlled at 50-70min, the adverse effect of too small temperature is that air holes cannot be formed, and the adverse effect of too large temperature is that the air holes are easy to decompose too fast to form uneven air holes or the air holes are broken.
After the foam stabilizing process is finished, the temperature is rapidly reduced to 550-650 ℃ at the speed of 9-11 ℃/min. The cooling rate is preferably 10 ℃/min, and the cooling end point temperature is preferably 600 ℃.
By adopting the design, the pore structure of the foam glass product in a high-temperature state is kept through the rapid curing molding of the batch, and the gas overflow caused by the shrinkage of the batch is avoided.
After the foaming process is finished, the rapid cooling in the foam stabilizing stage enables certain structural stress to be generated inside the foam glass product, in order to eliminate the stress, the product is kept at 550-650 ℃ for 30min, and then the power supply is turned off to be cooled to the room temperature along with the furnace.
And S6, demoulding the foam glass to obtain the product.
The foam glass and the method for producing the same according to the present application will be described in detail with reference to examples, comparative examples and experimental data.
Example 1
A method for preparing foam glass, which comprises the following steps:
the desulfurized gypsum W1 is dehydrated to become anhydrous desulfurized gypsum W11. 2, 96 and 2 parts of dust collecting powder W22, anhydrous desulfurized gypsum W11 and an additive W23 are mixed; uniformly mixing in a mixer to obtain a mixture W3, putting the mixed material in a mould for preliminary compression molding, and then putting the mould into a corundum crucible coated with vaseline or other volatile organic substances and carbon powder. Slowly heating to 450 ℃ at the speed of 5-7 ℃/min, preheating to obtain a hot mixed material W5, and keeping the temperature for 1h. Heating at 15 deg.C/min, and foaming at 1250 deg.C for about 1h. Rapidly cooling to 600 deg.C at a speed of 10 deg.C/min for foam stabilization, maintaining the temperature for 30min, turning off the power supply, and cooling to room temperature to perform annealing treatment.
Example 2
A method for preparing foam glass, which comprises the following steps:
the desulfurized gypsum W1 is dehydrated to form anhydrous desulfurized gypsum W11. 3 parts, 95 parts and 2 parts of dust collecting powder W22, anhydrous desulfurized gypsum W11 and additive W23 are mixed; uniformly mixing in a mixer to obtain a mixture W3, placing the mixed material in a mould for preliminary compression molding, and then placing in a corundum crucible coated with vaseline or other volatile organic substances and carbon powder. Slowly heating to 500 ℃ at the speed of 5-7 ℃/min, preheating to obtain a hot mixed material W5, and keeping the temperature for 1h. Heating at a heating rate of 15 deg.C/min, and foaming at 1350 deg.C for about 1h. Rapidly cooling to 650 ℃ at the speed of 10 ℃/min for foam stabilization, preserving heat for 30min, then turning off a power supply, and cooling to room temperature along with the furnace for annealing treatment.
Example 3
A method for preparing foam glass comprises the following steps:
the desulfurized gypsum W1 is dehydrated to form anhydrous desulfurized gypsum W11. 4 parts of dust collecting powder W22, 93 parts of anhydrous desulfurization gypsum W11 and 3 parts of additive W23 are mixed; uniformly mixing in a mixer to obtain a mixture W3, putting the mixed material in a mould for preliminary compression molding, and then putting the mould into a corundum crucible coated with vaseline or other volatile organic substances and carbon powder. Slowly heating to 550 ℃ at the speed of 5-7 ℃/min, preheating to obtain a hot mixed material W5, and keeping the temperature for 1h. Heating at 15 deg.C/min, and foaming at 1300 deg.C for about 1h. Rapidly cooling to 600 deg.C at a speed of 10 deg.C/min, stabilizing the foam, maintaining the temperature for 30min, turning off the power supply, and cooling to room temperature to perform annealing treatment. The performance was tested.
Example 4
A method for preparing foam glass, which comprises the following steps:
the desulfurized gypsum W1 is dehydrated to become anhydrous desulfurized gypsum W11. Mixing 5 parts of dust collecting powder W22, 92 parts of anhydrous desulfurization gypsum W11 and 3 parts of additive W23; uniformly mixing in a mixer to obtain a mixture W3, placing the mixed material in a mould for preliminary compression molding, and then placing in a corundum crucible coated with vaseline or other volatile organic substances and carbon powder. Slowly heating to 450 ℃ at the speed of 5-7 ℃/min, preheating to obtain a hot mixed material W5, and keeping the temperature for 1h. Heating at 15 deg.C/min, and foaming at 1250 deg.C for about 1h. Rapidly cooling to 650 ℃ at the speed of 10 ℃/min for foam stabilization, preserving heat for 30min, then turning off a power supply, and cooling to room temperature along with the furnace for annealing treatment.
Example 5
A method for preparing foam glass, which comprises the following steps:
the desulfurized gypsum W1 is dehydrated to become anhydrous desulfurized gypsum W11. 6 parts, 90 parts and 4 parts of dust collecting powder W22, anhydrous desulfurization gypsum W11 and an additive W23 are mixed; uniformly mixing in a mixer to obtain a mixture W3, putting the mixed material in a mould for preliminary compression molding, and then putting the mould into a corundum crucible coated with vaseline or other volatile organic substances and carbon powder. Slowly heating to 400 ℃ at the speed of 5-7 ℃/min, preheating to obtain a hot mixed material W5, and keeping the temperature for 1h. Heating at 15 deg.C/min, and foaming at 1300 deg.C for about 1h. Rapidly cooling to 600 deg.C at a speed of 10 deg.C/min for foam stabilization, maintaining the temperature for 30min, turning off the power supply, and cooling to room temperature to perform annealing treatment.
Example 6
A method for preparing foam glass, which comprises the following steps:
the desulfurized gypsum W1 is dehydrated to become anhydrous desulfurized gypsum W11. 2, 96 and 4 parts of dust collecting powder W22, anhydrous desulfurized gypsum W11 and additive W23 are mixed; uniformly mixing in a mixer to obtain a mixture W3, putting the mixed material in a mould for preliminary compression molding, and then putting the mould into a corundum crucible coated with vaseline or other volatile organic substances and carbon powder. Slowly heating to 400 ℃ at the speed of 5-7 ℃/min, preheating to obtain a hot mixed material W5, and keeping the temperature for 1h. Heating at 15 deg.C/min, and foaming at 1250 deg.C for about 1h. Rapidly cooling to 650 ℃ at the speed of 10 ℃/min for foam stabilization, preserving heat for 30min, then turning off a power supply, and cooling to room temperature along with the furnace for annealing treatment.
Comparative example 1
A method for preparing foam glass comprises the following steps:
the desulfurized gypsum W1 is dehydrated to become anhydrous desulfurized gypsum W11. Mixing 8 parts, 86 parts and 6 parts of dust collecting powder W22, anhydrous desulfurized gypsum W11 and an additive W23; uniformly mixing in a mixer to obtain a mixture W3, putting the mixed material in a mould for preliminary compression molding, and then putting the mould into a corundum crucible coated with vaseline or other volatile organic substances and carbon powder. Slowly heating to 400 ℃ at the speed of 5-7 ℃/min, preheating to obtain a hot mixed material W5, and keeping the temperature for 1h. Heating at a heating rate of 15 deg.C/min, and foaming at 1300 deg.C for about 1h. Rapidly cooling to 600 deg.C at a speed of 10 deg.C/min for foam stabilization, maintaining the temperature for 30min, turning off the power supply, and cooling to room temperature to perform annealing treatment.
Comparative example 2
A method for preparing foam glass, which comprises the following steps:
the desulfurized gypsum W1 is dehydrated to form anhydrous desulfurized gypsum W11. 1, 99 and 0 parts of dust collecting powder W22, anhydrous desulfurization gypsum W11 and an additive W23; uniformly mixing in a mixer to obtain a mixture W3, putting the mixed material in a mould for preliminary compression molding, and then putting the mould into a corundum crucible coated with vaseline or other volatile organic substances and carbon powder. Slowly heating to 400 ℃ at the speed of 5-7 ℃/min, preheating to obtain a hot mixed material W5, and keeping the temperature for 1h. Heating at 15 deg.C/min, and foaming at 1250 deg.C for about 1h. Quickly cooling to 650 ℃ at the speed of 10 ℃/min to stabilize the bubbles, keeping the temperature for 30min, then turning off the power supply, cooling to room temperature along with the furnace, and carrying out annealing treatment.
Comparative example 3
A method for preparing foam glass, which comprises the following steps:
the desulfurized gypsum W1 is dehydrated to become anhydrous desulfurized gypsum W11. Mixing 8 parts, 92 parts and 0 part of dust collecting powder W22, anhydrous desulfurization gypsum W11 and an additive W23; uniformly mixing in a mixer to obtain a mixture W3, placing the mixed material in a mould for preliminary compression molding, and then placing in a corundum crucible coated with vaseline or other volatile organic substances and carbon powder. Slowly heating to 400 ℃ at the speed of 5-7 ℃/min, preheating to obtain a hot mixed material W5, and keeping the temperature for 1h. Heating at a heating rate of 15 deg.C/min, and foaming at 1300 deg.C for about 1h. Rapidly cooling to 600 deg.C at a speed of 10 deg.C/min for foam stabilization, maintaining the temperature for 30min, turning off the power supply, and cooling to room temperature to perform annealing treatment.
Comparative example 4
A method for preparing foam glass, which comprises the following steps:
the desulfurized gypsum W1 is dehydrated to become anhydrous desulfurized gypsum W11. 1, 91 and 8 parts of dust collecting powder W22, anhydrous desulfurization gypsum W11 and an additive W23; uniformly mixing in a mixer to obtain a mixture W3, putting the mixed material in a mould for preliminary compression molding, and then putting the mould into a corundum crucible coated with vaseline or other volatile organic substances and carbon powder. Slowly heating to 400 ℃ at the speed of 5-7 ℃/min, preheating to obtain a hot mixed material W5, and keeping the temperature for 1h. Heating at a heating rate of 15 deg.C/min, and foaming at 1250 deg.C for about 1h. Rapidly cooling to 650 ℃ at the speed of 10 ℃/min for foam stabilization, preserving heat for 30min, then turning off a power supply, and cooling to room temperature along with the furnace for annealing treatment.
Related experiments:
related experiments:
the foam glasses obtained in examples 1 to 6 and comparative examples 1 to 4 were examined, and the results are shown in the following table:
as can be seen from the table, the foam glass prepared by the process has a bulk density of 0.25 to 035g/cm3The apparent porosity is 11 to 13 percent, and the total porosity is 81.1 to 88.1 percent; as can be seen by comparing the data of the comparative examples with those of the examples, when a parameter is outside the range provided by the present method, too low total porosity, too low bulk density, and too low apparent porosity occur.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) According to the method provided by the embodiment of the invention, the dust collection powder and the desulfurized gypsum generated by the graphitizing furnace are mixed and utilized, so that the problem that the solid waste is difficult to stockpile and dispose is solved;
(2) According to the method provided by the embodiment of the invention, the foam glass is prepared by mixing and utilizing the dust collecting powder and the desulfurized gypsum generated by the graphitization furnace, so that the aim of comprehensive utilization of resources is fulfilled;
(3) The method provided by the embodiment of the invention provides a new preparation scheme of the foam glass;
(4) The volume density of the foam glass provided by the embodiment of the invention is 0.25-035g/cm3The apparent porosity is 11-13%, and the total porosity is 81.1-88.1%.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for preparing foam glass, which is characterized by comprising the following steps:
carrying out free water removal treatment on the desulfurized gypsum to obtain desulfurized gypsum powder;
mixing the desulfurized gypsum, the graphitized dust collecting powder and an additive to obtain a mixed powder;
putting the mixed powder into a container for compression molding to obtain a blank;
preheating the blank to obtain a preheated blank;
heating, foaming, foam stabilizing and annealing the preheated blank to obtain foam glass;
the mixed powder comprises the following components in parts by mass: 2-6 parts of desulfurized gypsum, 89-97 parts of graphitized dust collecting powder and 1-5 parts of additive.
2. The method for producing a foam glass according to claim 1, wherein the component of the additive comprises Al by mass2O3、K2O、Fe2O3CaO, mgO and TiO2。
3. The method for preparing a foam glass according to claim 1, wherein the termination conditions of the free water removal treatment are: the desulfurized gypsum contains less than 0.5% by mass of water.
4. The method of claim 1, further comprising: subjecting the container to a pretreatment comprising: and (3) coating volatile organic substances on the inner wall of the container, and then coating carbon powder to finish pretreatment.
5. The method for preparing the foam glass according to claim 1, wherein the temperature rise rate of the preheating is 5-7 ℃/min, the end point temperature of the preheating is 400-500 ℃, and the heat preservation time of the preheating is 50-70min.
6. The method for producing a foam glass according to claim 1, wherein the temperature rise rate is 13 to 17 ℃/min.
7. The method for preparing foam glass according to claim 1, wherein the foaming temperature is 1250-1350 ℃ and the foaming time is 50-70min.
8. The method for preparing foam glass according to claim 1, wherein the pre-heated preform is cooled to 550-650 ℃ at a cooling rate of 9-11 ℃/min during the foam stabilization.
9. The method for preparing foam glass according to claim 1, wherein the pre-heated preform is held at 550-650 ℃ for 20-40min during the annealing process.
10. A foam glass produced by the method for producing a foam glass according to any one of claims 1 to 9.
Priority Applications (1)
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| JP2001302262A (en) * | 2000-04-24 | 2001-10-31 | Toshio Hoshino | Lightweight and high strength recycled glass foam using wasted cast sand |
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| US20050261121A1 (en) * | 2004-05-19 | 2005-11-24 | Earthstone International Llc | Elimination of crystalline silica from white foam glass by chemical additions |
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| JP2001302262A (en) * | 2000-04-24 | 2001-10-31 | Toshio Hoshino | Lightweight and high strength recycled glass foam using wasted cast sand |
| CN103342468A (en) * | 2013-06-28 | 2013-10-09 | 北京晶雅石科技有限公司 | Composite plate material of foam microcrystalline glass and pure microcrystalline glass and manufacturing method of composite plate material |
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| CN104788011A (en) * | 2015-04-07 | 2015-07-22 | 内蒙古科技大学 | Foam microcrystalline glass made of high-silicon iron tailings and production method of foam microcrystalline glass |
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