CN112341017A - Method for preparing high-strength geopolymer cementing material from aluminum ash - Google Patents
Method for preparing high-strength geopolymer cementing material from aluminum ash Download PDFInfo
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- CN112341017A CN112341017A CN202011195329.XA CN202011195329A CN112341017A CN 112341017 A CN112341017 A CN 112341017A CN 202011195329 A CN202011195329 A CN 202011195329A CN 112341017 A CN112341017 A CN 112341017A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/1535—Mixtures thereof with other inorganic cementitious materials or other activators with alkali metal containing activators, e.g. sodium hydroxide or waterglass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention belongs to the field of green treatment and resource utilization of solid wastes, and relates to a method for preparing a high-strength geopolymer cementing material from aluminum ash. Firstly, crushing and screening aluminum ash, and separating out substances such as metallic aluminum and the like. Then, the alumino-ash is ball milled and sieved to separate the substances which are difficult to break. Mixing the undersize product of the aluminous ash with a certain proportion of alkaline substances, and roasting at 200-1100 ℃ for 1-5 h. After the baking and sintering, mixing the baked product with fly ash and other solid wastes according to a certain proportion, adding water glass as an excitant, and obtaining the geopolymer cementing material after stirring, injection molding, maintenance and demolding. The geopolymer cementing material prepared by the method has the characteristic of high mechanical property, and meanwhile, no harmful gas is generated in the preparation process. The invention can realize green disposal and resource utilization of the aluminum ash, and has simple process and small environmental burden.
Description
Technical Field
The invention belongs to the field of green treatment and resource utilization of solid wastes, and particularly relates to a method for preparing a high-strength geopolymer cementing material from aluminum ash.
Background
The aluminum ash slag is a waste slag generated in the production process of aluminum and aluminum alloy, and mainly comes from infusible inclusions, oxides and various additives floating on the surface of an aluminum melt during smelting. 30-100 kg of aluminum ash can be generated when 1 ton of electrolytic aluminum, primary aluminum alloy and secondary aluminum alloy is produced. According to the estimation, the yield of the aluminum ash in China exceeds 300 ten thousand tons in 2019. The aluminum ash contains a large amount of metallic aluminum and aluminum oxide, which are valuable secondary resources; meanwhile, the aluminum ash also contains environmental pollutants such as aluminum nitride, villiaumite and the like, so the aluminum ash has the dual characteristics of resource and pollution. At present, the disposal and resource utilization of the aluminum ash slag become one of the key problems influencing the healthy development of the aluminum industry in China.
The traditional disposal mode of the aluminous ash mainly comprises the following steps: the "fried aluminum" is used for metallurgical reducing agent, landfill and the like. Firstly, the 'aluminum frying', namely extracting simple substance aluminum in aluminum ash through oxidation and temperature rise, is a widely adopted aluminum ash recycling method at present. The method has the advantage of simple process, but the application of the method is limited by the problems of low aluminum recovery rate, large environmental pollution in the treatment process, treatment of secondary ash residues and the like. Secondly, the aluminum ash slag is used as a metallurgical reducing agent, and the problems of serious secondary resource waste, low product added value and the like exist. And the aluminum ash landfill not only occupies a large amount of land and wastes secondary resources, but also affects the ecological environment safety due to aluminum nitride, fluoride and the like in the aluminum ash.
Geopolymers, also known as inorganic polymers, geopolymers, etc., are a cementitious material with a three-dimensional network structure. The geopolymer can be prepared from natural minerals or industrial solid wastes under the condition of chemical excitation. The geopolymer has excellent mechanical property, high temperature resistance and corrosion resistance, can replace portland cement in the field of building materials, and has good performance in the fields of sealing treatment of heavy metal waste and nuclear waste, porous adsorption materials, high-performance composite materials and the like. The production process of the traditional Portland cement can discharge a large amount of CO2The carbon emission can be obviously reduced by using industrial solid wastes as raw materials to prepare the geopolymer. In order to realize resource utilization of the aluminum ash, researchers develop a method for preparing a geopolymer from the aluminum ash. Chinese patent 201810794223.8 discloses a method for preparing a foamed geopolymer gelled material by using aluminous ash as a raw material. The method comprises the steps of firstly, screening, washing and drying the aluminum ash, mixing the aluminum ash with blast furnace mineral powder and fly ash according to a certain proportion, taking the aluminum powder in the aluminum ash as a foaming agent, adding a foam stabilizer, and carrying out polymerization reaction and foaming reaction under the action of an alkaline activator to prepare the aluminum ashPreparing foamed geopolymer slurry, forming, and sealing and curing to obtain the foamed geopolymer gel material. The foamed geopolymer cementing material prepared by the method has the characteristics of high strength, flame retardance, heat preservation and the like, is simple in process and low in cost, and solves the problems of corrosion and peeling of various salts in aluminum ash residues to the material. However, this method uses a water washing process to treat the aluminous ash, and a large amount of polluting gas is generated during the treatment due to hydrolysis of AlN.
The geopolymer is prepared by taking industrial solid wastes as raw materials, so that the cooperative treatment of the industrial solid wastes can be realized, the resources and the energy are saved, and the carbon emission is obviously reduced. However, the preparation of geopolymer gelled materials from aluminous clinker as raw material in the prior art still has the following problems: firstly, the aluminum ash is pretreated by adopting a water washing mode, so that the problems of aluminum nitride pollution, high water consumption, high difficulty in treating secondary pollutants and the like are easily caused; secondly, the components of the aluminum ash are complex, the material activity is low, and the prepared geopolymer cementing material has poor mechanical property. Therefore, the development of green treatment of aluminous clinker and preparation technology of high-strength geopolymer cementing material is needed.
Disclosure of Invention
The invention discloses a method for preparing a high-strength geopolymer cementing material from aluminum ash, aiming at the problems of aluminum nitride pollution, high water consumption, high difficulty in treating secondary pollutants, low strength of geopolymer products and the like in the prior art for treating the aluminum ash and preparing the geopolymer cementing material. The geopolymer cementing material prepared by the method has the characteristic of high mechanical property, and meanwhile, no harmful gas is generated in the preparation process. The invention can realize green disposal and resource utilization of the aluminum ash, and has simple process and small environmental burden.
The invention is realized by the following technical scheme:
a method for preparing a high-strength geopolymer gelled material from aluminum ash comprises the steps of activating the aluminum ash to obtain an aluminum ash activated material, mixing the aluminum ash activated material with fly ash and other solid wastes, and carrying out ball milling; adding an exciting agent into the ball-milled materials, stirring to obtain slurry, and carrying out injection molding, curing and demolding on the slurry to obtain the geopolymer cementing material.
Further, the aluminum ash slag is one or two of electrolytic aluminum ash and regenerated aluminum ash; the other solid wastes are any one or more of red mud, steel slag and slag; the fly ash is one or two of low-calcium fly ash and high-calcium fly ash, the low-calcium fly ash refers to that the mass percentage of calcium oxide is less than 10%, and the high-calcium fly ash refers to that the mass percentage of calcium oxide is more than or equal to 10%.
Further, the aluminum ash activation treatment comprises crushing and screening, ball milling and screening and alkaline roasting, and the specific steps are as follows:
(1) crushing and screening: crushing the aluminum ash for 30-60 min by adopting an extrusion type crushing device, and sieving the crushed aluminum ash by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum, wherein the weight of undersize materials accounts for more than or equal to 90% of the total weight of the crushed materials;
(2) ball milling and screening: dry-grinding the crushed and screened undersize materials in a ball mill for 60-240 min, screening the ball-milled aluminum ash slag by using a 300-mesh screen to remove difficult-to-grind materials, wherein the weight of the undersize materials accounts for more than or equal to 98% of the total weight of the ball-milled materials;
(3) alkaline roasting: mixing the aluminum ash slag subjected to ball milling and screening with alkali, and roasting at the temperature of 200-1100 ℃ for 1-5 h; the adopted alkali is any one or the combination of any two or more of sodium hydroxide, potassium hydroxide and calcium hydroxide, and the amount of the alkali is 5 to 30 percent of the weight of the aluminum ash residue after ball milling and screening.
Further, when the aluminum ash residue activating material is mixed with the fly ash and other solid wastes, the aluminum ash residue activating material is controlled to be 30 wt% -60 wt%, the fly ash is controlled to be 20 wt% -40 wt%, and the other solid wastes are controlled to be 20 wt% -40 wt%, and the total amount is 100 wt%.
Further, the exciting agent is a mixture of alkali and water glass, and the molar ratio of the alkali to the water glass is controlled to be 0.5: 1-4: 1; the alkali is any one of sodium hydroxide and potassium hydroxide; the addition amount of the exciting agent is 10-30 wt% of the total weight of the materials after ball milling.
Further, the curing temperature is 30-85 ℃, and the curing time is 12-48 h.
Furthermore, the 7d compressive strength of the prepared geopolymer cementing material is more than or equal to 65 MPa.
The invention has the beneficial technical effects that:
(1) in the method, the aluminum ash is subjected to crushing, screening, ball milling and screening to separate components such as metallic aluminum in the aluminum ash, and the aluminum ash is mechanically activated.
(2) The method removes aluminum nitride and chemically activated aluminum ash in the aluminum ash through low-temperature alkaline roasting activation, avoids the release of harmful gas in the subsequent treatment process, and reduces the using amount of an exciting agent;
(3) according to the method, the geopolymer cementing material is prepared by using the aluminum ash activated material as an aluminum source, fly ash and other solid wastes as a silicon source and a calcium source, so that the synergistic treatment of the solid wastes is realized;
(4) the geopolymer cementing material prepared by the method has the characteristic of high strength, and the 7d compressive strength is more than or equal to 65 MPa.
Drawings
FIG. 1 is a process flow diagram for preparing a high-strength geopolymer cementing material from aluminum ash in the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
Example 1
Crushing the aluminum ash for 30 min by adopting an extrusion type crushing device, sieving the crushed aluminum ash by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 91 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 60min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 5h at 200 ℃. The alkali is sodium hydroxide, and the dosage of the alkali is 30 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material with high-calcium fly ash (calcium oxide content is 12%), red mud and steel slag, wherein the mixed material comprises the following components in percentage by weight: 60 wt.% of aluminum ash activation material, 20 wt.% of fly ash, 10 wt.% of red mud and 10 wt.% of steel slag. And adding a mixture of sodium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the sodium hydroxide to the water glass is 0.5:1, and the adding amount of the exciting agent is 30% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 85 ℃ and curing time is 12 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 65.2 MPa.
Example 2
Crushing the aluminum ash slag for 60min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 97 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 240min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 99% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 1 h at 1100 ℃. The alkali is potassium hydroxide, and the amount of the alkali is 5% of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material with low-calcium fly ash (the content of calcium oxide is 7 percent), red mud and steel slag, wherein the mixed material comprises the following components in percentage by weight: 30 wt% of aluminum ash activation material, 40 wt% of fly ash, 10 wt% of red mud and 20 wt% of steel slag. And adding a mixture of potassium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of sodium hydroxide to the water glass is 4:1, and the adding amount of the exciting agent is 20% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 30 ℃ and curing time is 48 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 70.6 MPa.
Example 3
Crushing the aluminum ash slag for 40min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 98 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 200min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 99% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 2h at 900 ℃. The alkali is a mixture of potassium hydroxide and sodium hydroxide, and the amount of the alkali is 30% of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material with high-calcium fly ash (the content of calcium oxide is 15 percent), slag and steel slag, wherein the mixed material comprises the following components in percentage by weight: 50 wt.% of aluminum ash slag activating material, 30wt.% of fly ash, 10 wt.% of slag and 10 wt.% of steel slag. And adding a mixture of potassium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of sodium hydroxide to the water glass is 3:1, and the adding amount of the exciting agent is 10% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 65 ℃ and curing time is 40 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 85.3 MPa.
Example 4
Crushing the aluminum ash slag for 50min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 93 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 150min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 4 h at 800 ℃. The alkali is a mixture of potassium hydroxide and calcium hydroxide, and the amount of the alkali is 15% of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material with low-calcium fly ash (calcium oxide content is 6%), red mud, slag and steel slag, wherein the mixed material comprises the following components in percentage by weight: 40wt.% of aluminum ash activation material, 30wt.% of fly ash, 10 wt.% of red mud, 10 wt.% of slag and 10 wt.% of steel slag. And adding a mixture of sodium hydroxide, potassium sodium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the sodium hydroxide to the potassium hydroxide to the water glass is 4:1, and the adding amount of the exciting agent is 20% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 60 ℃ and curing time is 38 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 88.6 MPa.
Example 5
Crushing the aluminum ash slag for 50min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 93 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 150min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 4 h at 800 ℃. The alkali is a mixture of potassium hydroxide and calcium hydroxide, and the amount of the alkali is 15% of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material with low-calcium fly ash (calcium oxide content is 6%), red mud, slag and steel slag, wherein the mixed material comprises the following components in percentage by weight: 40wt.% of aluminum ash activation material, 30wt.% of fly ash, 10 wt.% of red mud, 10 wt.% of slag and 10 wt.% of steel slag. And adding a mixture of sodium hydroxide, potassium sodium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the sodium hydroxide to the potassium hydroxide to the water glass is 4:1, and the adding amount of the exciting agent is 20% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 60 ℃ and curing time is 38 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 88.6 MPa.
Example 6
Crushing the aluminum ash slag for 45 min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 92% of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 100min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.5% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 3 h at 600 ℃. The alkali is a mixture of sodium hydroxide, potassium hydroxide and calcium hydroxide, and the amount of the alkali is 20% of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material with high-calcium fly ash (calcium oxide content is 13%), slag and steel slag, wherein in the mixed material: 50 wt.% of aluminum ash slag activating material, 20 wt.% of fly ash, 20 wt.% of slag and 10 wt.% of steel slag. And adding a mixture of sodium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the sodium hydroxide to the water glass is 2:1, and the adding amount of the exciting agent is 15% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (the curing temperature is 80 ℃ and the curing time is 30 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 81.6 MPa.
Example 7
Crushing the aluminum ash by adopting an extrusion type crushing device for 35 min, sieving the crushed aluminum ash by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 97 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 80min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.7% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 5 hours at 400 ℃. The alkali is calcium hydroxide, and the dosage of the alkali is 30 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activated material, low-calcium fly ash (the content of calcium oxide is 7 percent), red mud and slag, wherein the mixed material comprises the following components in percentage by weight: 30wt.% of aluminum ash slag activating material, 40wt.% of fly ash, 15 wt.% of red mud and 15 wt.% of slag. And adding a mixture of potassium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the potassium hydroxide to the water glass is 3:1, and the adding amount of the exciting agent is 30% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 85 ℃ and curing time is 20 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 69.2 MPa.
Example 8
Crushing the aluminum ash slag for 55 min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 96% of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 110min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.6% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 4.5 h at 1050 ℃. The alkali is a mixture of calcium hydroxide and sodium hydroxide, and the amount of the alkali is 25 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material, high-calcium fly ash (the content of calcium oxide is 14%) and red mud, wherein the mixed material comprises the following components in percentage by weight: 50 wt% of aluminum ash activation material, 20 wt% of fly ash and 30 wt% of red mud. And adding a mixture of sodium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of potassium hydroxide to the water glass is 4:1, and the adding amount of the exciting agent is 28% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 75 ℃ and curing time is 36 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 83.6 MPa.
Example 9
Crushing the aluminum ash slag for 60min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 97 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 200min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 99% of the total weight of the ball-milled materials. Mixing the ball-milled and screened aluminum ash with alkali, and roasting at 1100 ℃ for 4 h. The alkali is a mixture of sodium hydroxide and potassium hydroxide, and the amount of the alkali is 20 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material, high-calcium fly ash (the content of calcium oxide is 14%) and steel slag, wherein the mixed material comprises the following components in percentage by weight: 55 wt% of aluminum ash activation material, 25 wt% of fly ash and 20 wt% of steel slag. And adding a mixture of potassium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the potassium hydroxide to the water glass is 3:1, and the adding amount of the exciting agent is 27% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 68 ℃ and curing time is 40 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 81.6 MPa.
Example 10
Crushing the aluminum ash slag for 50min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 96% of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 220min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 99% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 3 h at 850 ℃. The alkali is a mixture of sodium hydroxide, potassium hydroxide and calcium hydroxide, and the amount of the alkali is 30% of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material, high-calcium fly ash (the content of calcium oxide is 14%) and slag, wherein in the mixed material: 55 wt.% of aluminum ash activating material, 25 wt.% of fly ash and 20 wt.% of slag. And adding a mixture of potassium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the potassium hydroxide to the water glass is 2.5:1, and the adding amount of the exciting agent is 25% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 65 ℃ and curing time is 39 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 80.2 MPa.
Example 11
Crushing the aluminum ash slag for 40min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 95 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 180min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting at 780 ℃ for 4 h. The alkali is a mixture of sodium hydroxide and calcium hydroxide, and the amount of the alkali is 30% of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material, high-calcium fly ash (the content of calcium oxide is 14 percent), red mud and steel slag, wherein the mixed material comprises the following components in percentage by weight: 40wt.% of aluminum ash activation material, 20 wt.% of fly ash, 20 wt.% of red mud and 20 wt.% of steel slag. And adding a mixture of potassium hydroxide, sodium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the potassium hydroxide to the sodium hydroxide to the water glass is 2:1, and the adding amount of the exciting agent is 30% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 50 ℃ and curing time is 40 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 75.6 MPa.
Example 12
Crushing the aluminum ash for 30 min by adopting an extrusion type crushing device, and sieving the crushed aluminum ash by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 92% of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 240min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 99% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 5 hours at 350 ℃. The alkali is a mixture of sodium hydroxide and potassium hydroxide, and the amount of the alkali is 26 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material with low-calcium fly ash (the content of calcium oxide is 7 percent), red mud, steel slag and slag, wherein the mixed material comprises the following components in percentage by weight: 30wt.% of aluminum ash activation material, 40wt.% of fly ash, 10 wt.% of red mud, 5wt.% of steel slag and 15 wt.% of slag. And adding a mixture of sodium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the sodium hydroxide to the water glass is 3:1, and the adding amount of the exciting agent is 30% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 85 ℃ and curing time is 48 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 90.2 MPa.
Example 13
Crushing the aluminum ash slag for 60min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 97 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 220min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.2% of the total weight of the ball-milled materials. Mixing the ball-milled and screened aluminum ash with alkali, and roasting at 1100 ℃ for 5 h. The alkali is sodium hydroxide, and the dosage of the alkali is 30 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material, high-calcium fly ash (the content of calcium oxide is 14 percent), red mud and steel slag, wherein the mixed material comprises the following components in percentage by weight: 40wt.% of aluminum ash activation material, 30wt.% of fly ash, 15 wt.% of red mud and 15 wt.% of steel slag. And adding a mixture of potassium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the potassium hydroxide to the water glass is 4:1, and the adding amount of the exciting agent is 30% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature of 80 ℃ and curing time of 40 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 88.2 MPa.
Example 14
Crushing the aluminum ash slag for 45 min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 93 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 140 min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.6% of the total weight of the ball-milled materials. Mixing the ball-milled and screened aluminum ash with alkali, and roasting at 950 ℃ for 4.5 h. The alkali is a mixture of sodium hydroxide and calcium hydroxide, and the amount of the alkali is 23 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activated material, low-calcium fly ash (the content of calcium oxide is 7 percent), red mud and slag, wherein the mixed material comprises the following components in percentage by weight: 45 wt.% of aluminum ash activation material, 25 wt.% of fly ash, 10 wt.% of red mud and 20 wt.% of steel slag. And adding a mixture of potassium hydroxide, sodium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the potassium hydroxide to the sodium hydroxide to the water glass is 3.5:1, and the adding amount of the exciting agent is 22% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 68 ℃ and curing time is 48 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 82.5 MPa.
Example 15
Crushing the aluminum ash by adopting an extrusion type crushing device for 35 min, sieving the crushed aluminum ash by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 91 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 90 min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.2% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 5h at 780 ℃. The alkali is calcium hydroxide, and the dosage of the alkali is 30 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material, low-calcium fly ash (the content of calcium oxide is 7 percent), red mud and steel slag, wherein the mixed material comprises the following components in percentage by weight: 60 wt.% of aluminum ash activation material, 20 wt.% of fly ash, 10 wt.% of red mud and 10 wt.% of steel slag. And adding a mixture of potassium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the potassium hydroxide to the water glass is 3:1, and the adding amount of the exciting agent is 28% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 50 ℃ and curing time is 48 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 70.8 MPa.
Example 16
Crushing the aluminum ash slag for 50min by adopting an extrusion type crushing device, and sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 92% of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 110min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.7% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 5 hours at 400 ℃. The alkali is a mixture of sodium hydroxide and potassium hydroxide, and the amount of the alkali is 30% of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material with high-calcium fly ash (calcium oxide content is 14%), steel slag and slag, wherein in the mixed material: 45 wt.% of aluminum ash activation material, 25 wt.% of fly ash, 10 wt.% of steel slag and 20 wt.% of slag. And adding a mixture of sodium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the sodium hydroxide to the water glass is 4:1, and the adding amount of the exciting agent is 25% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 75 ℃ and curing time is 41 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 79.6 MPa.
Example 17
Crushing the aluminum ash slag for 60min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 95 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 170 min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.9% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting at 980 ℃ for 3.5 h. The alkali is a mixture of sodium hydroxide and potassium hydroxide, and the amount of the alkali is 30% of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material with high-calcium fly ash (calcium oxide content is 14%), steel slag and slag, wherein in the mixed material: 45 wt.% of aluminum ash activation material, 25 wt.% of fly ash, 10 wt.% of steel slag and 20 wt.% of slag. And adding a mixture of potassium hydroxide, sodium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the sodium hydroxide to the potassium hydroxide to the water glass is 2.5:1, and the adding amount of the exciting agent is 26% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 70 ℃ and curing time is 36 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 83.8 MPa.
Example 18
Crushing the aluminum ash slag for 55 min by adopting an extrusion type crushing device, and sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 92% of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 150min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.3% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting at 780 ℃ for 3.0 h. The alkali is calcium hydroxide, and the dosage of the alkali is 30 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material with low-calcium fly ash (the content of calcium oxide is 7 percent), red mud, steel slag and slag, wherein the mixed material comprises the following components in percentage by weight: 55 wt.% of aluminum ash activation material, 25 wt.% of fly ash, 5wt.% of steel slag, 10 wt.% of red mud and 5wt.% of slag. And adding a mixture of potassium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the potassium hydroxide to the water glass is 3:1, and the adding amount of the exciting agent is 25% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 55 ℃ and curing time is 30 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 76.5 MPa.
Example 19
Crushing the aluminum ash slag for 45 min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 92% of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 75 min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.2% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 5.0 h at 480 ℃. The alkali is a mixture of sodium hydroxide and potassium hydroxide, and the amount of the alkali is 17% of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material, high-calcium fly ash (the content of calcium oxide is 15 percent), red mud and steel slag, wherein the mixed material comprises the following components in percentage by weight: 35 wt.% of aluminum ash activation material, 35 wt.% of fly ash, 15 wt.% of red mud, 5wt.% of steel slag and 10 wt.% of slag. And adding a mixture of sodium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the sodium hydroxide to the water glass is 2.5:1, and the adding amount of the exciting agent is 22% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 48 ℃ and curing time is 48 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 73.5 MPa.
Example 20
Crushing the aluminum ash slag for 50min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 93 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 140 min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.3% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 5.0 h at 900 ℃. The alkali is a mixture of sodium hydroxide and calcium hydroxide, and the amount of the alkali is 25 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material with low-calcium fly ash (the content of calcium oxide is 7 percent), steel slag and slag, wherein in the mixed material: 52 wt.% of aluminum ash activation material, 28 wt.% of fly ash, 15 wt.% of steel slag and 15 wt.% of slag. And adding a mixture of sodium hydroxide, potassium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the sodium hydroxide to the water glass is 1.5:1, and the adding amount of the exciting agent is 30% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 85 ℃ and curing time is 48 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 72.1 MPa.
Example 21
Crushing the aluminum ash slag for 60min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 93.2 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 160 min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.6% of the total weight of the ball-milled materials. Mixing the ball-milled and screened aluminum ash with alkali, and roasting at 1100 ℃ for 1.0 h. The alkali is a mixture of sodium hydroxide and potassium hydroxide, and the amount of the alkali is 20 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material with high-calcium fly ash (calcium oxide content is 14%), red mud and slag, wherein in the mixed material: 60 wt.% of aluminum ash activation material, 20 wt.% of fly ash, 5wt.% of red mud and 15 wt.% of slag. And adding a mixture of sodium hydroxide, potassium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the sodium hydroxide to the water glass is 1.5:1, and the adding amount of the exciting agent is 30% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 85 ℃ and curing time is 48 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 77.6 MPa.
Example 22
Crushing the aluminum ash slag for 45 min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 92.1 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 150min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.2% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 3.5 h at 1000 ℃. The alkali is sodium hydroxide, and the dosage of the alkali is 22 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material, high-calcium fly ash (the content of calcium oxide is 14%) and red mud, wherein in the mixed material: 55 wt.% of aluminum ash activated material, 20 wt.% of fly ash and 25 wt.% of red mud. And adding a mixture of potassium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the potassium hydroxide to the water glass is 2:1, and the adding amount of the exciting agent is 24% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 73 ℃ and curing time is 39 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 80.1 MPa.
Example 23
Crushing the aluminum ash slag for 50min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 92.2 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 220min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.6% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 4.0 h at 820 ℃. The alkali is potassium hydroxide, and the dosage of the alkali is 24 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material with high-calcium fly ash (the content of calcium oxide is 15 percent), red mud and steel slag, wherein the mixed material comprises the following components in percentage by weight: 47 wt.% of aluminum ash activation material, 33 wt.% of fly ash, 10 wt.% of red mud and 10 wt.% of steel slag. And adding a mixture of sodium hydroxide, potassium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the sodium hydroxide to the potassium hydroxide to the water glass is 4:1, and the adding amount of the exciting agent is 28% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 66 ℃ and curing time is 40 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 89.3 MPa.
Example 24
Crushing the aluminum ash slag for 60min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 93 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 240min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.3% of the total weight of the ball-milled materials. Mixing the ball-milled and screened aluminum ash with alkali, and roasting at 1100 ℃ for 5.0 h. The alkali is a mixture of sodium hydroxide and potassium hydroxide, and the amount of the alkali is 30% of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material with high-calcium fly ash (calcium oxide content is 17%), steel slag and slag, wherein in the mixed material: 50 wt.% of aluminum ash slag activating material, 30wt.% of fly ash, 10 wt.% of steel slag and 10 wt.% of slag. And adding a mixture of sodium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the sodium hydroxide to the water glass is 4:1, and the adding amount of the exciting agent is 30% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 85 ℃ and curing time is 48 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 85.4 MPa.
Example 25
Crushing the aluminum ash slag for 60min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 92.3 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 145 min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.2% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 5.0 h at 500 ℃. The alkali is a mixture of sodium hydroxide, potassium hydroxide and calcium hydroxide, and the amount of the alkali is 21 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material, low-calcium fly ash (the content of calcium oxide is 7 percent), red mud and steel slag, wherein the mixed material comprises the following components in percentage by weight: 52 wt.% of aluminum ash activation material, 22 wt.% of fly ash, 14 wt.% of red mud and 12 wt.% of steel slag. And adding a mixture of potassium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of sodium hydroxide to the water glass is 3.5:1, and the adding amount of the exciting agent is 27% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 75 ℃ and curing time is 40 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 72.8 MPa.
Example 26
Crushing the aluminum ash slag for 55 min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 91.8 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 95 min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.6% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 3.5 h at 690 ℃. The alkali is a mixture of sodium hydroxide and potassium hydroxide, and the amount of the alkali is 29 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material, high-calcium fly ash (the content of calcium oxide is 17%) and steel slag, wherein the mixed material comprises the following components in percentage by weight: 55 wt% of aluminum ash activation material, 20 wt% of fly ash and 25 wt% of steel slag. And adding a mixture of sodium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the sodium hydroxide to the water glass is 1.5:1, and the adding amount of the exciting agent is 30% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 75 ℃ and curing time is 48 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 70.5 MPa.
Example 27
Crushing the aluminum ash slag for 40min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 91.8 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 110min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.2% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 4.0 h at 990 ℃. The alkali is a mixture of potassium hydroxide and calcium hydroxide, and the amount of the alkali is 25 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material, low-calcium fly ash (the content of calcium oxide is 7 percent), steel slag and red mud, wherein the mixed material comprises the following components in percentage by weight: 44 wt.% of aluminum ash activation material, 26 wt.% of fly ash, 15 wt.% of steel slag and 15 wt.% of red mud. And adding a mixture of sodium hydroxide, potassium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the sodium hydroxide to the potassium hydroxide to the water glass is 2.5:1, and the adding amount of the exciting agent is 30% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature of 80 ℃ and curing time of 45 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 76.2 MPa.
Example 28
Crushing the aluminum ash slag for 55 min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 92.2 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 200min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.6% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 5.0 h at 820 ℃. The alkali is potassium hydroxide, and the dosage of the alkali is 20 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activated material with high-calcium fly ash (the content of calcium oxide is 17%), red mud and slag, wherein the mixed material comprises the following components in percentage by weight: 50 wt.% of aluminum ash slag activating material, 20 wt.% of fly ash, 20 wt.% of slag and 10 wt.% of red mud. And adding a mixture of potassium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the potassium hydroxide to the water glass is 3:1, and the adding amount of the exciting agent is 24% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 70 ℃ and curing time is 40 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 73.8 MPa.
Example 29
Crushing the aluminum ash slag for 60min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 91.5 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 210 min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.3% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 4.5 h at 790 ℃. The alkali is sodium hydroxide, and the dosage of the alkali is 22 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activated material with high-calcium fly ash (the content of calcium oxide is 17%), red mud and slag, wherein the mixed material comprises the following components in percentage by weight: 52 wt.% of aluminum ash activation material, 23 wt.% of fly ash, 20 wt.% of slag and 5wt.% of red mud. And adding a mixture of sodium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the sodium hydroxide to the water glass is 2.8:1, and the adding amount of the exciting agent is 29% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 72 ℃ and curing time is 43 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 78.3 MPa.
Example 30
Crushing the aluminum ash slag for 60min by adopting an extrusion type crushing device, sieving the crushed aluminum ash slag by using a sieve with the aperture of 30 meshes to remove coarse materials such as metal aluminum and the like, wherein the weight of undersize materials accounts for 90.7 percent of the total weight of the crushed materials. And (3) dry-grinding the crushed materials in a ball mill for 220min, and screening the ball-milled aluminum ash through a 300-mesh screen to remove the difficult-to-grind materials, wherein the weight of undersize materials accounts for 98.6% of the total weight of the ball-milled materials. Mixing the aluminum ash slag after ball milling and screening with alkali, and roasting for 5h at 850 ℃. The alkali is a mixture of sodium hydroxide and calcium hydroxide, and the amount of the alkali is 27 percent of the weight of the aluminum ash. Mixing and ball-milling the aluminum ash activation material with low-calcium fly ash (the content of calcium oxide is 7 percent), red mud, steel slag and slag, wherein the mixed material comprises the following components in percentage by weight: 45 wt.% of aluminum ash activation material, 27 wt.% of fly ash, 8 wt.% of red mud, 10 wt.% of slag and 10 wt.% of steel slag. And adding a mixture of sodium hydroxide, potassium hydroxide and water glass into the ball-milled materials as an exciting agent, wherein the molar ratio of the sodium hydroxide to the potassium hydroxide to the water glass is 3:1, and the adding amount of the exciting agent is 30% of the total weight of the ball-milled materials. And stirring the mixture to obtain slurry, and performing injection molding, curing (curing temperature is 85 ℃ and curing time is 48 hours) and demolding on the slurry to obtain the geopolymer gel material. Through testing, the compressive strength of the prepared geopolymer cementing material 7d is 86.7 MPa.
Claims (7)
1. A method for preparing a high-strength geopolymer cementing material from aluminum ash is characterized in that the aluminum ash is activated to obtain an aluminum ash activated material, and the aluminum ash activated material is mixed with fly ash and other solid wastes and subjected to ball milling; adding an exciting agent into the ball-milled materials, stirring to obtain slurry, and carrying out injection molding, curing and demolding on the slurry to obtain the geopolymer cementing material.
2. The method for preparing the high-strength geopolymer cementing material from the aluminum ash slag according to claim 1, wherein the aluminum ash slag is one or two of electrolytic aluminum ash and regenerated aluminum ash; the other solid wastes are any one or more of red mud, steel slag and slag; the fly ash is one or two of low-calcium fly ash and high-calcium fly ash, the low-calcium fly ash refers to that the mass percentage of calcium oxide is less than 10%, and the high-calcium fly ash refers to that the mass percentage of calcium oxide is more than or equal to 10%.
3. The method for preparing the high-strength geopolymer cementing material from the aluminum ash according to claim 1, wherein the aluminum ash is subjected to activation treatment comprising crushing and screening, ball milling and screening, and alkaline roasting, and the method comprises the following specific steps:
(1) crushing and screening: crushing the aluminum ash for 30-60 min by adopting an extrusion type crushing device, and sieving the crushed aluminum ash by using a sieve with the aperture of 30 meshes, wherein the weight of undersize accounts for more than or equal to 90% of the total weight of the crushed materials;
(2) ball milling and screening: dry-grinding the crushed and screened undersize materials in a ball mill for 60-240 min, screening the ball-milled aluminum ash slag by using a 300-mesh screen to remove difficult-to-grind materials, wherein the weight of the undersize materials accounts for more than or equal to 98% of the total weight of the ball-milled materials;
(3) alkaline roasting: mixing the aluminum ash slag subjected to ball milling and screening with alkali, and roasting at the temperature of 200-1100 ℃ for 1-5 h; the adopted alkali is any one or the combination of any two or more of sodium hydroxide, potassium hydroxide and calcium hydroxide, and the amount of the alkali is 5 to 30 percent of the weight of the aluminum ash residue after ball milling and screening.
4. The method for preparing the high-strength geopolymer cementing material from the aluminum ash slag according to the claim 1, wherein the aluminum ash slag activating material is controlled to be 30 wt% -60 wt%, the fly ash is controlled to be 20 wt% -40 wt%, and the other solid waste is controlled to be 20 wt% -40 wt%, and the total amount is 100 wt%.
5. The method for preparing the high-strength geopolymer cementing material from the aluminum ash slag according to claim 1, wherein the excitant is a mixture of alkali and water glass, and the molar ratio of the alkali to the water glass is controlled to be 0.5: 1-4: 1; the alkali is any one of sodium hydroxide and potassium hydroxide; the addition amount of the exciting agent is 10-30 wt% of the total weight of the materials after ball milling.
6. The method for preparing the high-strength geopolymer cementing material from the aluminum ash according to claim 1, wherein the curing temperature is 30-85 ℃ and the curing time is 12-48 h.
7. The method for preparing the high-strength geopolymer cementing material from the aluminum ash according to claim 1, wherein the 7d compressive strength of the prepared geopolymer cementing material is not less than 65 MPa.
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| CN114804830A (en) * | 2022-02-25 | 2022-07-29 | 中南大学 | Geopolymer-based composite material, preparation method thereof and application thereof in aircraft heat-proof structure |
| CN115716722A (en) * | 2022-11-30 | 2023-02-28 | 北京科技大学 | Preparation method of fly ash-based geopolymer with adjustable mechanical properties |
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