CN114044630B - Regenerated porous glass ceramic and preparation method and application thereof - Google Patents
Regenerated porous glass ceramic and preparation method and application thereof Download PDFInfo
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- CN114044630B CN114044630B CN202111527563.2A CN202111527563A CN114044630B CN 114044630 B CN114044630 B CN 114044630B CN 202111527563 A CN202111527563 A CN 202111527563A CN 114044630 B CN114044630 B CN 114044630B
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- 239000005373 porous glass Substances 0.000 title claims abstract description 55
- 239000000919 ceramic Substances 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000002699 waste material Substances 0.000 claims abstract description 52
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 48
- 239000002893 slag Substances 0.000 claims abstract description 45
- 239000010881 fly ash Substances 0.000 claims abstract description 44
- 239000011521 glass Substances 0.000 claims abstract description 43
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000004327 boric acid Substances 0.000 claims abstract description 24
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims description 45
- 238000010438 heat treatment Methods 0.000 claims description 28
- 238000001816 cooling Methods 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 21
- 239000002689 soil Substances 0.000 claims description 19
- 238000000498 ball milling Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 14
- 230000032683 aging Effects 0.000 claims description 12
- 238000005245 sintering Methods 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 7
- 238000000748 compression moulding Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 239000004566 building material Substances 0.000 claims description 3
- 239000002241 glass-ceramic Substances 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000002910 solid waste Substances 0.000 abstract description 10
- 238000004064 recycling Methods 0.000 abstract description 7
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 239000000843 powder Substances 0.000 description 24
- 239000002245 particle Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 238000002791 soaking Methods 0.000 description 5
- 230000004580 weight loss Effects 0.000 description 5
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000010813 municipal solid waste Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910001038 basic metal oxide Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000006063 cullet Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
- C03C10/0063—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing waste materials, e.g. slags
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides regenerated porous glass ceramic, a preparation method and application thereof, and relates to the technical field of waste recycling. The invention provides regenerated porous glass ceramic, which comprises the following preparation raw materials in parts by weight: 10-35 parts of fly ash, 10-35 parts of engineering slag, 30-68 parts of waste glass, 3-5 parts of calcium carbonate and 3-5 parts of boric acid. The invention prepares the regenerated porous glass ceramic by using the fly ash, the engineering slag and the waste glass, and utilizes the solid waste as a resource, thereby having low cost and solving the problem of environmental pollution.
Description
Technical Field
The invention relates to the technical field of waste recycling, in particular to regenerated porous glass ceramic, a preparation method and application thereof.
Background
Fly ash is an incineration residue collected in a system such as flue gas purification, heat recovery and utilization after household garbage incineration. The waste incineration fly ash contains heavy metals, dioxin and chlorine elements, and if the fly ash is not properly treated, the ecological environment and the human health can be seriously harmed. At present, the disposal mode of the fly ash in China is mainly to safely landfill after solidification/stabilization, but the technology occupies a large amount of land resources, dioxin and heavy metals are not removed yet, and potential environmental risks exist.
Engineering dregs account for more than 70% of the total amount of construction waste, but the utilization rate of dregs resources is less than 5%, and most engineering dregs are transported to suburb areas for open-air accumulation or landfill without any treatment. The vehicle not only occupies a large amount of land, but also has the problems of dust, flying sand and the like in the transportation and stacking processes of the vehicle, and serious environmental pollution can be caused.
The output of waste glass in China is about 1 hundred million tons each year, the comprehensive utilization rate is only 25-30%, and the waste glass is recycled and reprocessed with high cost and is often discarded as household garbage. The waste glass which is not recycled in a large amount not only causes resource waste, but also has great negative influence on the environment.
How to carry out harmless and recycling treatment on fly ash, engineering slag and waste glass becomes a difficult problem to be solved.
Disclosure of Invention
The invention aims to provide a regenerated porous glass ceramic and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides regenerated porous glass ceramic, which comprises the following preparation raw materials in parts by weight:
10-35 parts of fly ash, 10-35 parts of engineering slag, 30-68 parts of waste glass, 3-5 parts of calcium carbonate and 3-5 parts of boric acid.
Preferably, the chemical composition of the fly ash comprises: siO (SiO) 2 5～18wt％、CaO 42～60wt％、Al 2 O 3 1～3wt％、Fe 2 O 3 1.5～3wt％、Na 2 O 3～5wt％、Cl 15～20wt％、SO 3 6.7 to 8.6 weight percent and 1.4 to 2 weight percent of MgO.
Preferably, the chemical composition of the engineering slag soil comprises: siO (SiO) 2 45～65wt％、Al 2 O 3 18 to 35 weight percent and 6 to 25 weight percent of alkaline metal oxide.
Preferably, the plasticity index of the engineering slag soil is 8-15.
Preferably, the chemical composition of the waste glass includes: siO (SiO) 2 70～85wt％、Al 2 O 3 1～3wt％、CaO 5～10wt％、MgO 1～4wt％、Na 2 O5-14wt% and Fe 2 O 3 0.10～0.18wt％。
The invention provides a preparation method of regenerated porous glass ceramic, which comprises the following steps:
ball-milling and mixing fly ash, engineering slag, waste glass, calcium carbonate and boric acid to obtain a mixture;
mixing the mixture with water to obtain a semi-dry mixture;
pressing and forming the semi-dry mixture to obtain a blank;
and (3) ageing and sintering the green body in sequence to obtain the regenerated porous glass ceramic.
Preferably, the rotation speed of the ball milling and mixing is 36-38 r/min.
Preferably, the pressure of the compression molding is 5-8 MPa, and the dwell time is 1-8 seconds.
Preferably, the sintering process comprises: heating to 400 ℃ from room temperature at a heating rate of 0.8-2 ℃/min, and preserving heat for 20-30 minutes; heating to 850-1100 ℃ at a heating rate of 5-15 ℃/min, and preserving heat for 30-80 minutes; then cooling to 400-600 ℃ at a cooling rate of 8-15 ℃/min, and finally naturally cooling to room temperature.
The invention provides the application of the regenerated porous glass ceramic prepared by the technical scheme or the preparation method of the technical scheme as a building material.
The invention provides regenerated porous glass ceramic, which comprises the following preparation raw materials in parts by weight: 10-35 parts of fly ash, 10-35 parts of engineering slag, 30-68 parts of waste glass, 3-5 parts of calcium carbonate and 3-5 parts of boric acid. In the invention, the engineering slag soil has certain viscosity and good plasticity, and the invention can obtain lighter porous glass ceramic by adding the engineering slag soil, does not need to additionally add adhesive, saves cost, and solves the problem of recycling treatment of the engineering slag soil; the waste glass has low price, and the fluxing effect is achieved when the waste glass is added into the green body, so that waste is effectively, quickly and safely changed into valuable. The invention prepares the regenerated porous glass ceramic by using the solid waste fly ash, the engineering slag and the waste glass as main raw materials, realizes the recycling of the solid waste, and has remarkable social value, economic value and ecological value.
The example results show that the regenerated porous glass ceramic provided by the invention has the performance advantages of light weight, high strength and stable fire resistance; compact volumeThe degree is 375-1100 kg/m 3 The compressive strength is 2.0-9.8 MPa; the weight loss rate after soaking in water for 60 days is less than or equal to 2.0 percent; the aperture of the regenerated porous glass ceramic is 0.1-2 mm, the porosity is 20-70%, and the water absorption is 5-35%.
Detailed Description
The invention provides regenerated porous glass ceramic, which comprises the following preparation raw materials in parts by weight:
10-35 parts of fly ash, 10-35 parts of engineering slag, 30-68 parts of waste glass, 3-5 parts of calcium carbonate and 3-5 parts of boric acid.
The raw materials for preparing the regenerated porous glass ceramic comprise 10-35 parts of fly ash, preferably 12-20 parts of fly ash. In the present invention, the chemical composition of the fly ash preferably includes: siO (SiO) 2 5～18wt％、CaO 42～60wt％、Al 2 O 3 1～3wt％、Fe 2 O 3 1.5～3wt％、Na 2 O 3～5wt％、Cl 15～20wt％、SO 3 6.7 to 8.6 weight percent and 1.4 to 2 weight percent of MgO. In a specific embodiment of the invention, the fly ash is an untreated incineration residue collected in a flue gas cleaning, heat recovery and utilization system of a living garbage incineration plant.
The raw materials for preparing the regenerated porous glass ceramic comprise 10-35 parts of engineering slag soil, preferably 25-30 parts, based on the weight parts of the fly ash. In the present invention, the chemical composition of the engineering slag soil preferably includes: siO (SiO) 2 45～65wt％、Al 2 O 3 18 to 35 weight percent and 6 to 25 weight percent of alkaline metal oxide. In the present invention, the basic metal oxide preferably comprises CaO 0.2 to 4.6wt%, mgO 0.5 to 1.9wt%, na, based on 100% by mass of the engineering slag soil 2 O 0.5～1.2wt％、Fe 2 O 3 2.4～9.6wt％、K 2 O1.8-6.2 wt% and TiO 2 0.6 to 1.5 weight percent. In a specific embodiment of the invention, the engineering muck is waste muck without any treatment. In the present invention, the plasticity index of the engineering slag is preferably 8 to 15, more preferably 10 to 12. The invention adopts engineering slag to prepare regenerated porous glass ceramic, which can be used under the action of smaller pressing pressureThe porous glass ceramic with excellent molding stability is obtained, the volume density is small, and the porous glass ceramic is lighter.
The raw materials for preparing the regenerated porous glass ceramic comprise 30-68 parts of waste glass, preferably 47-50 parts, based on the weight parts of the fly ash. In the present invention, the chemical composition of the waste glass preferably includes: siO (SiO) 2 70～85wt％、Al 2 O 3 1～3wt％、CaO 5～10wt％、MgO 1～4wt％、Na 2 O5-14wt% and Fe 2 O 3 0.10 to 0.18 weight percent. In a specific embodiment of the present invention, the waste glass is waste flat glass, waste glass cullet, waste bottle glass or waste embossed glass.
The raw materials for preparing the regenerated porous glass ceramic comprise 3-5 parts of calcium carbonate, preferably 4 parts of calcium carbonate, based on the weight parts of the fly ash. In the present invention, the calcium carbonate is preferably an industrial grade powder; the particle size of the calcium carbonate is preferably 0.1 to 1. Mu.m. In the present invention, calcium carbonate is used as a foaming agent to enable pore formation of glass ceramics.
The raw materials for preparing the regenerated porous glass ceramic comprise 3-5 parts of boric acid, preferably 4 parts of boric acid, based on the weight parts of the fly ash. In the present invention, the boric acid is preferably an industrial grade powder; the particle size of the boric acid is preferably 5 to 75 μm. In the invention, the boric acid is used as a fluxing agent, which is beneficial to improving the melting uniformity of each preparation raw material.
In the present invention, the pore diameter of the regenerated porous glass ceramic is preferably 0.1 to 2mm, more preferably 0.5 to 0.8mm; the porosity is preferably 20 to 70%, more preferably 49 to 65%; the water absorption is preferably 5 to 35%, more preferably 18 to 30%.
The volume density of the regenerated porous glass ceramic provided by the invention is preferably 375-843 kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The compressive strength is preferably 3.3-9.1 MPa; the weight loss rate after 60 days of soaking in water is preferably 1.7-1.9%.
The invention also provides a preparation method of the regenerated porous glass ceramic, which comprises the following steps:
ball-milling and mixing fly ash, engineering slag, waste glass, calcium carbonate and boric acid to obtain a mixture;
mixing the mixture with water to obtain a semi-dry mixture;
pressing and forming the semi-dry mixture to obtain a blank;
and (3) ageing and sintering the green body in sequence to obtain the regenerated porous glass ceramic.
The invention carries out ball milling and mixing on fly ash, engineering slag, waste glass, calcium carbonate and boric acid to obtain a mixture. In the invention, the rotating speed of the ball milling and mixing is preferably 36-38 r/min. In the present invention, the ball-milling mixing is preferably performed in a planetary ball mill.
In the present invention, the ball-milling mixing of fly ash, engineering slag, waste glass, calcium carbonate and boric acid preferably comprises: ball milling the fly ash, engineering slag soil and waste glass respectively to obtain fly ash powder, engineering slag soil powder and waste glass powder; and then ball-milling and mixing the fly ash powder, the engineering slag powder, the waste glass powder, the calcium carbonate and the boric acid. In the present invention, the particle size of the fly ash powder, the engineering slag powder and the waste glass powder is independently preferably 200 to 325 mesh. In the present invention, the time of the ball-milling mixing is preferably 10 to 15 minutes.
After the mixture is obtained, the invention mixes the mixture with water to obtain the semi-dry mixture. In the present invention, the water is preferably added in an amount of 5 to 10% by mass, more preferably 5 to 8% by mass, of the mixture.
After the semi-dry mixture is obtained, the semi-dry mixture is pressed and molded to obtain a green body. In the present invention, the press molding is preferably performed in a steel mold. In the present invention, the pressure of the press molding is preferably 5 to 8MPa, more preferably 6 to 7MPa; the dwell time is preferably 1 to 8 seconds, more preferably 3 to 5 seconds.
After the green body is obtained, the green body is aged and sintered in sequence to obtain the regenerated porous glass ceramic. In the present invention, the aging is preferably performed in a natural environment. In the present invention, the aging time is preferably 10 to 15 hours. In the present invention, the sintering process preferably includes: heating to 400 ℃ from room temperature at a heating rate of 0.8-2 ℃/min, and preserving heat for 20-30 minutes; heating to 850-1100 ℃ at a heating rate of 5-15 ℃/min, and preserving heat for 30-80 minutes; then cooling to 400-600 ℃ at a cooling rate of 8-15 ℃/min, and finally naturally cooling to room temperature. In the present invention, the sintering process more preferably includes: heating to 400 ℃ from room temperature at a heating rate of 0.8-0.9 ℃/min, and preserving heat for 20-30 minutes; heating to 950-1100 ℃ at a heating rate of 8-12 ℃/min, and preserving heat for 40-60 minutes; then cooling to 400-600 ℃ at a cooling rate of 10-12 ℃/min, and finally naturally cooling to room temperature.
The invention mixes the regenerated solid waste raw material with calcium carbonate, boric acid and a proper amount of water, presses and forms a blank by a semi-dry method, and sinters the blank according to a certain procedure after aging to obtain the regenerated porous glass ceramic with uniform air holes and excellent performance. The main raw materials of the invention are solid waste fly ash, engineering slag soil and waste glass, and the solid waste is recycled. According to the invention, through controlling the sintering procedure, dioxin in the fly ash can be effectively decomposed, and meanwhile, the high-temperature melt can effectively coat residual dioxin, high chlorine, high calcium and heavy metal components, and harmful substances are solidified in porous glass ceramic after cooling, so that the fly ash is effectively subjected to harmless treatment; the engineering slag soil has certain viscosity and better plasticity after adding a proper amount of water, and the invention not only ensures that the pressed blank body keeps a certain shape by adding the engineering slag soil, is beneficial to subsequent sintering, but also saves cost without adding other binders, and simultaneously solves the problem of recycling treatment of the engineering slag soil; the waste glass has low price, and the fluxing effect is achieved when the waste glass is added into the green body, so that waste is effectively, quickly and safely changed into valuable. The invention prepares the regenerated porous glass ceramic by using the solid waste fly ash, the engineering slag and the waste glass as main raw materials, realizes the recycling of the solid waste, and has remarkable social value, economic value and ecological value. The regenerated porous glass ceramic prepared by the method can recycle the solid waste resources, avoid the environmental problem caused by the traditional treatment method, save the cost and have the performance advantages of light weight, high strength, fire resistance and stability compared with porous glass.
The invention also provides the application of the regenerated porous glass ceramic prepared by the technical scheme or the preparation method of the technical scheme as a building material.
The technical solutions of the present invention will be clearly and completely described in the following in connection with the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. 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.
Example 1
Drying engineering slag soil, fly ash and waste glass with the plasticity index of 10 and grinding the engineering slag soil, the fly ash and the waste glass to powder solid with the particle size of 200 meshes; ball-milling and mixing the powdery solid, the calcium carbonate powder and the boric acid powder for 10min to obtain a mixture; the weight portions of the raw materials are as follows: 30 parts of engineering slag, 10 parts of fly ash, 50 parts of waste glass, 5 parts of calcium carbonate powder and 5 parts of boric acid powder;
adding 8% by mass of water into the mixture, and then mixing to obtain a semi-dry mixture;
placing the semi-dry mixture into a steel mold for semi-dry compression molding, wherein the compression pressure is 5MPa, and maintaining the pressure for 3 seconds to obtain a blank;
aging the blank for 15 hours in a natural environment, then heating the blank to 400 ℃ from room temperature at a heating rate of 0.8 ℃/min, and preserving heat for 30 minutes; then heating to 1100 ℃ at a heating rate of 12 ℃/min, and preserving heat for 60 minutes; then cooling to 600 ℃ at a cooling rate of 10 ℃/min, and finally naturally cooling to room temperature to obtain the regenerated porous glass ceramic.
The regenerated porous glass ceramic prepared in this example was foamed uniformly and had a bulk density of 843kg/m 3 The compressive strength is 9.1MPa; the weight loss rate after soaking in water for 60 days is 1.9%; the pore diameter of the regenerated porous glass ceramic is 0.1mm, the porosity is 20%, and the water absorption is 5%.
Example 2
Drying and grinding engineering slag soil, fly ash and waste glass with the plasticity index of 12 to obtain powdery solid with the particle size of 325 meshes; ball-milling and mixing the powdery solid, the calcium carbonate powder and the boric acid powder for 10min to obtain a mixture; the weight portions of the raw materials are as follows: 25 parts of engineering slag, 20 parts of fly ash, 47 parts of waste glass, 4 parts of calcium carbonate powder and 4 parts of boric acid powder;
adding 8% by mass of water into the mixture, and then mixing to obtain a semi-dry mixture;
placing the semi-dry mixture into a steel mold for semi-dry compression molding, wherein the compression pressure is 6MPa, and maintaining the pressure for 3 seconds to obtain a blank;
aging the blank for 15 hours in a natural environment, then heating the blank to 400 ℃ from room temperature at a heating rate of 0.9 ℃/min, and preserving heat for 20 minutes; then heating to 1000 ℃ at a heating rate of 10 ℃/min, and preserving heat for 50 minutes; then cooling to 400 ℃ at a cooling rate of 8 ℃/min, and finally naturally cooling to room temperature to obtain the regenerated porous glass ceramic.
The regenerated porous glass ceramic prepared in this example was foamed uniformly with a bulk density of 698kg/m 3 The compressive strength is 7.6MPa; the weight loss rate after soaking in water for 60 days is 1.7%; the pore diameter of the regenerated porous glass ceramic is 0.8mm, the porosity is 49%, and the water absorption is 18%.
Example 3
Drying and grinding engineering slag soil, fly ash and waste glass with the plasticity index of 15 to obtain powdery solid with the particle size of 200 meshes; ball-milling and mixing the powdery solid, the calcium carbonate powder and the boric acid powder for 15min to obtain a mixture; the weight portions of the raw materials are as follows: 10 parts of engineering slag, 12 parts of fly ash, 68 parts of waste glass, 5 parts of calcium carbonate powder and 5 parts of boric acid powder;
adding 5% by mass of water into the mixture, and then mixing to obtain a semi-dry mixture;
placing the semi-dry mixture into a steel mold for semi-dry compression molding, wherein the compression pressure is 8MPa, and maintaining the pressure for 3 seconds to obtain a blank;
aging the blank for 15 hours in a natural environment, then heating the blank to 400 ℃ from room temperature at a heating rate of 0.9 ℃/min, and preserving heat for 20 minutes; heating to 950 ℃ at a heating rate of 8 ℃/min, and preserving heat for 40 minutes; then cooling to 400 ℃ at a cooling rate of 12 ℃/min, and finally naturally cooling to room temperature to obtain the regenerated porous glass ceramic.
The regenerated porous glass ceramic prepared in this example was foamed uniformly and had a bulk density of 375kg/m 3 The compressive strength is 3.3MPa; the weight loss rate after soaking in water for 60 days is 1.7%; the pore diameter of the regenerated porous glass ceramic is 2mm, the porosity is 70%, and the water absorption is 35%.
Comparative example 1
Substantially the same as in example 1, except that no engineering slag was added, a green body could not be formed after pressing.
Comparative example 2
Substantially the same as in example 1, except that the pressing pressure was adjusted from "5MPa" to "30MPa" without adding engineering slag, the bulk density of the resulting porous glass ceramic was 1700kg/m 3 。
The regenerated porous glass ceramic prepared by the method has the advantages of uniform foaming, smaller volume density, light weight, high strength and good water stability, and solves the problems of land occupation area occupied by solid waste landfills such as fly ash, engineering slag and waste glass, waste free of resource utilization and difficult treatment.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (7)
1. The regenerated porous glass ceramic consists of the following preparation raw materials in parts by weight:
10-35 parts of fly ash, 10-35 parts of engineering slag, 30-68 parts of waste glass, 3-5 parts of calcium carbonate and 3-5 parts of boric acid; the chemical composition of the engineering slag soil comprises: siO (SiO) 2 45～65wt％、Al 2 O 3 18 to 35 weight percent and 6 to 25 weight percent of alkaline metal oxide;
the preparation method of the regenerated porous glass ceramic comprises the following steps:
ball-milling and mixing fly ash, engineering slag, waste glass, calcium carbonate and boric acid to obtain a mixture;
mixing the mixture with water to obtain a semi-dry mixture;
pressing and forming the semi-dry mixture to obtain a blank;
sequentially aging and sintering the green body to obtain regenerated porous glass ceramic;
the pressure of the compression molding is 5-8 MPa, and the pressure maintaining time is 1-8 seconds;
the aging is performed in a natural environment; the aging time is 10-15 hours;
the sintering process comprises the following steps: heating to 400 ℃ from room temperature at a heating rate of 0.8-2 ℃/min, and preserving heat for 20-30 minutes; heating to 850-1100 ℃ at a heating rate of 5-15 ℃/min, and preserving heat for 30-80 minutes; then cooling to 400-600 ℃ at a cooling rate of 8-15 ℃/min, and finally naturally cooling to room temperature.
2. The recycled porous glass ceramic of claim 1, wherein the chemical composition of the fly ash comprises: siO (SiO) 2 5～18wt％、CaO42～60wt％、Al 2 O 3 1～3wt％、Fe 2 O 3 1.5～3wt％、Na 2 O3～5wt％、Cl15～20wt％、SO 3 6.7 to 8.6 weight percent and 1.4 to 2 weight percent of MgO.
3. The regenerated porous glass ceramic according to claim 1, wherein the engineering slag has a plasticity index of 8 to 15.
4. The recycled porous glass ceramic of claim 1, wherein the chemical composition of the waste glass comprises: siO (SiO) 2 70～85wt％、Al 2 O 3 1～3wt％、CaO5～10wt％、MgO1～4wt％、Na 2 O5～14wt% and Fe 2 O 3 0.10～0.18wt％。
5. The method for producing a regenerated porous glass ceramic according to any one of claims 1 to 4, comprising the steps of:
ball-milling and mixing fly ash, engineering slag, waste glass, calcium carbonate and boric acid to obtain a mixture;
mixing the mixture with water to obtain a semi-dry mixture;
pressing and forming the semi-dry mixture to obtain a blank;
and (3) ageing and sintering the green body in sequence to obtain the regenerated porous glass ceramic.
6. The method according to claim 5, wherein the rotational speed of the ball-milling mixture is 36-38 r/min.
7. Use of a regenerated porous glass-ceramic according to any one of claims 1 to 4 or a regenerated porous glass-ceramic prepared by a method according to any one of claims 5 to 6 as a building material.
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