CN113060954A - Method for preparing tobermorite-based inorganic cementing material by using alkali-activated solid waste micro powder at normal temperature and product thereof - Google Patents
Method for preparing tobermorite-based inorganic cementing material by using alkali-activated solid waste micro powder at normal temperature and product thereof Download PDFInfo
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- CN113060954A CN113060954A CN202110438019.4A CN202110438019A CN113060954A CN 113060954 A CN113060954 A CN 113060954A CN 202110438019 A CN202110438019 A CN 202110438019A CN 113060954 A CN113060954 A CN 113060954A
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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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- 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
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Abstract
The invention discloses a method for preparing tobermorite-based inorganic cementing material by using alkali to excite solid waste micro powder at normal temperature, which is characterized in that fly ash, slag micro powder and steel slag micro powder are matched according to the mass ratio of X:92-X:8 to serve as raw materials of the solid waste micro powder, wherein X is 20-52; mixing a NaOH solution of 1-5 mol/L serving as an alkali activator with the mixed solid waste micro powder according to the mass ratio of 0.4-0.5:1 at the temperature of 20 +/-2 ℃, and then placing the mixture in a slurry mixer for fully stirring and reversing a mold; and placing the slurry of the reverse mold in a curing box for curing and molding to obtain the tobermorite-based inorganic cementing material. Wherein, the concentration of the NaOH solution is 3mol/L, and the mass ratio of the fly ash, the slag micro powder and the steel slag micro powder is 24:68: the 28d compressive strength of the product prepared by 8 hours reaches the peak value of 37.1 MPa. The technology of the invention not only solves the problem of solid waste resource utilization, but also reduces the energy consumption and environmental pollution in the production process of the inorganic cementing material, and has obvious economic benefit and environmental benefit.
Description
Technical Field
The invention relates to an inorganic cementing material and a preparation method thereof, in particular to a method for preparing a tobermorite-based inorganic cementing material by using alkali to excite solid waste micro powder at normal temperature and a product thereof, belonging to the technical field of solid waste resource utilization.
Background
The rapid increase of the solid waste yield and storage capacity due to the industrialized development and the increasingly obvious problem of low solid waste reutilization rate are caused by the industrialized development, and the treatment, storage and disposal of the solid waste become the constraints of the sustainable development of the social economy. Methods for treating solid waste typically include secondary building materials buried, stockpiled, or used in road construction.
The activation modes of solid wastes include chemical activation and physical activation, alkali activation is the most effective chemical activation mode for preparing the inorganic gelled material by using the solid wastes, and the activation modes include sulfate activation, carbonate activation and the like besides alkali activation, and the physical activation modes include calcination, grinding, ultrasonic waves, microwaves and the like. The alkali excitation is a chemical activation mode which can effectively improve the activity of the solid waste micro powder. The alkali-activated cementing material is an inorganic cementing material prepared by adding alkaline substances into raw materials to improve the activity of the raw materials, the alkali-activated agent generally adopts water glass, NaOH and the like, and various raw materials and various alkali-activated agents can be added in the preparation process. The pure solid waste micro powder is used as a precursor, and the inorganic cementing material is prepared on the premise of not adding cement, so that the method has great significance for recycling and reducing solid waste. The alkali-activated solid waste cementing material is one of inorganic cementing materials expected to become cement substitutes, and the preparation of the inorganic cementing material by utilizing the solid waste is an effective utilization way of solid waste resources.
The tobermorite and the C-S-H gel in the cementing material are both calcium silicate hydrate, and the tobermorite and the C-S-H gel have higher crystallization degree, the tobermorite in an XRD (X-ray diffraction) spectrum presents an obvious crystal peak, and the C-S-H gel presents a 'steamed bread peak'. The tobermorite has an obvious layered structure, has a good adsorption effect on heavy metal ions, and can be used as an adsorption material in various fields.
The traditional preparation method of tobermorite requires high temperature, for example, Chinese patent CN105780121A discloses a method for synthesizing tobermorite whiskers by taking fly ash as a raw material, which is to react in a high-pressure closed container at 150-260 ℃ to obtain tobermorite whiskers; chinese patent CN109081353A discloses tobermorite prepared by activating bottom ash of incinerator with humic acid and its application, wherein the volume ratio of sodium hydroxide aqueous solution to humic acid aqueous solution is 1: 1 mixing the mixture with incinerator bottom ash, and stirring to obtain suspended sludge liquid; and (3) placing the suspension slurry into 120-180 ℃ for hydrothermal reaction for 24h, cooling the reaction liquid to room temperature, washing with deionized water, and drying the washing product to obtain the tobermorite. However, the tobermorite prepared by the method is generally used as a high-performance adsorption material and has no mechanical property.
The applicant prepares the tobermorite-based inorganic cementing material by utilizing all solid wastes at normal temperature on the premise of not doping cement clinker, not only solves the problem of difficult resource utilization of the solid wastes, but also obtains the tobermorite-based inorganic cementing material with good mechanical property, and the tobermorite-based inorganic cementing material has important economic benefit and theoretical significance in practical engineering popularization and application. After retrieval, no report is found about a method for preparing the tobermorite-based inorganic cementing material by using the alkali-activated solid waste micro powder at normal temperature and a product thereof.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method for preparing the tobermorite-based inorganic cementing material by using alkali-activated solid waste micro powder at normal temperature and a product thereof.
The invention relates to a method for preparing tobermorite-based inorganic cementing material by using alkali-activated solid waste micro powder at normal temperature, which comprises the following steps:
mixing fly ash, slag micropowder and steel slag micropowder according to a mass ratio X:92-X:8 to serve as a solid waste micropowder raw material, wherein X is 20-52; taking 1-5 mol/L sodium hydroxide solution as an alkali activator, mixing the sodium hydroxide solution and the mixed solid waste micro powder according to the mass ratio of 0.4-0.5:1 at the temperature of 20 +/-2 ℃, then placing the mixture in a slurry mixer for fully stirring and performing mould inversion; and (4) placing the slurry of the reverse mold in a curing box for curing and molding to obtain the tobermorite-based inorganic cementing material.
The preferred implementation is: mixing fly ash, slag micropowder and steel slag micropowder according to a mass ratio of 24:68:8 to serve as solid waste micropowder raw materials, taking 3mol/L sodium hydroxide solution as an alkali activator, mixing the sodium hydroxide solution and the mixed solid waste micropowder according to a mass ratio of 0.4:1 at the temperature of 20 ℃, and then placing the mixture in a paste mixer for fully stirring and reversing a mould; and (4) placing the slurry of the reverse mold in a curing box for curing and molding to obtain the tobermorite-based inorganic cementing material.
The method for preparing the tobermorite-based inorganic cementing material by using the alkali-activated solid waste micro powder at normal temperature comprises the following steps: the fly ash is F-type fly ash, and the particle size of the F-type fly ash is less than 100 mu m.
Wherein: the fly ash comprises the following main components in percentage by mass: al (Al)2O3 29.59％、SiO2 54.7％、CaO 3.97％、Fe2O3 7.79％。
The method for preparing the tobermorite-based inorganic cementing material by using the alkali-activated solid waste micro powder at normal temperature comprises the following steps: the slag micro powder comprises the following main components in percentage by mass: al (Al)2O3 14.24％、SiO2 29.75％、CaO 41.45％、Fe2O31.7％。
The method for preparing the tobermorite-based inorganic cementing material by using the alkali-activated solid waste micro powder at normal temperature comprises the following steps: the steel slag micro powder comprises the following main components in percentage by mass: al (Al)2O3 3.8％、SiO2 16.06％、CaO 46.85％、Fe2O321％。
The method for preparing the tobermorite-based inorganic cementing material by using the alkali-activated solid waste micro powder at normal temperature comprises the following steps: the fully stirring condition is preferably that the stirring is carried out by using a clean slurry stirrer for 120s at a slow speed, stopping for 15s and stirring for 120s at a fast speed in a circulating way.
The method for preparing the tobermorite-based inorganic cementing material by using the alkali-activated solid waste micro powder at normal temperature comprises the following steps: the curing conditions in the curing box are preferably 20 ℃ and 99% relative humidity.
The product is prepared by the method for preparing the tobermorite-based inorganic cementing material by using the alkali-activated solid waste micro powder at normal temperature.
The invention discloses a method for preparing tobermorite-based inorganic cementing material by using alkali to excite solid waste micro powder at normal temperature and a product thereof, which solves the problems of rapid increase of solid waste yield and storage capacity, low solid waste utilization rate and difficult solid waste resource utilization, reduces energy consumption and environmental pollution, obtains the tobermorite-based inorganic cementing material with better mechanical property, can be widely used for infrastructure construction in the green environmental protection direction, and has obvious economic and environmental benefits.
The outstanding substantive features and remarkable progress of the invention are as follows:
the traditional preparation method of tobermorite needs high temperature, and the tobermorite-based inorganic cementing material is prepared at normal temperature. The traditional tobermorite preparation needs washing and drying of a product, the product is generally only used as a high-performance adsorption material, and the tobermorite-based inorganic cementing material is prepared by alkali-activated solid waste micro powder and has good mechanical properties on the premise of containing a large amount of tobermorite; wherein the mass ratio of the fly ash to the slag micro powder to the steel slag micro powder is 24:68: at 8, the 28d compressive strength reaches the peak value of 37.1 MPa. The traditional alkali-activated solid waste inorganic cementing material only considers the mechanical property, but the invention uses the difference of hydration products, endows the material with new functions on the premise of ensuring the good performance of the material, and has important economic benefit and theoretical significance in practical engineering popularization and application.
Drawings
FIG. 1 is an XRD spectrum of fly ash, slag micropowder and steel slag micropowder.
FIG. 2 is an XRD spectrum of tobermorite-based inorganic cementing material prepared by the method of the invention.
Fig. 3 is SEM photographs of tobermorite in the hydrated product, and (a) and (b) clearly show tobermorite whose microstructure shows a plate-like honeycomb structure.
FIG. 4 is an SEM photograph of the hydration products of the present invention, (a) amorphous gel C-S-H, (b) various hydration product distribution images including tobermorite, amorphous gel C-S-H, and goethite.
FIG. 5 shows the compressive strength of inorganic cementitious material 28d prepared at different sodium hydroxide concentrations.
FIG. 6 shows the compressive strength of inorganic cementitious material 28d prepared with different amounts of fly ash.
Detailed Description
The present invention will be described in detail with reference to the following detailed drawings and examples. The following examples are only preferred embodiments of the present invention, and it should be noted that the following descriptions are only for explaining the present invention and not for limiting the present invention in any form, and any simple modifications, equivalent changes and modifications made to the embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
In the following examples, materials, reagents and the like used were obtained commercially unless otherwise specified.
Example 1: identification of sources and main components of fly ash, slag micro powder and steel slag micro powder
1. Fly ash, slag micropowder and steel slag micropowder
Taking solid waste micro powder raw material fly ash from a coal-fired power plant in Shandong province, wherein the fly ash is F-type fly ash, and the particle size of the fly ash is less than 100 mu m; the fly ash comprises the following main components in percentage by mass: al (Al)2O3 29.59％、SiO2 54.7％、CaO 3.97％、Fe2O37.79 percent. The slag is blast furnace slag from iron works in Shandong province, treated by water quenching method, calcined and ground into micro powder; the slag micro powder comprises the following main components in percentage by mass: al (Al)2O3 14.24％、SiO2 29.75％、CaO 41.45％、Fe2O31.7 percent. The steel slag is taken from a steel plant in Shandong province, calcined and ground into micro powder; the steel slag micro powder comprises the following main components in percentage by mass: al (Al)2O3 3.8％、SiO2 16.06％、CaO 46.85％、Fe2O3 21％。
2. Identification of main components of raw materials
The components of the fly ash, the slag and the steel slag are analyzed by XRD, the mineral composition of the fly ash is shown in figure 1, and the main phases of the fly ash are alpha quartz, mullite, hematite and calcite; the main phases of the slag micro powder are amorphous phase calcium-silicon-aluminum minerals such as dicalcium silicate, tricalcium aluminate and the like; the main phases of the steel slag micro powder are dicalcium silicate, tricalcium silicate, dicalcium ferrite, RO phase and free calcium oxide.
Example 2: preparation of tobermorite-based inorganic cementing material by excitation of different alkali solution concentrations and mechanical property analysis
1. The preparation method comprises
Under the condition of normal temperature, respectively taking 200g of sodium hydroxide solution with the concentration of 1, 2, 3, 4 and 5mol/L as alkali excitation solution; 120g, 340g and 40g of fly ash, slag micro powder and steel slag micro powder are respectively mixed; respectively pouring sodium hydroxide solutions (5 groups) with different concentrations into a pure slurry stirrer container, adding the matched solid waste micro powder, slowly stirring for 120s, stopping stirring for 15s, circularly stirring for 120s until the mixture is fully stirred, and then pouring the mixture into a mold; and (3) placing the slurry subjected to the die-casting in a curing box with the temperature of 20 ℃ and the relative humidity of 99% for curing and forming to obtain 5 groups of tobermorite-based inorganic cementing materials.
2. Microscopic characterization and mechanical property test of inorganic cementing material
The prepared inorganic cementing material hydration product is analyzed by X-ray diffraction, and the result is shown in figure 2, wherein diffraction angles 2 theta are positioned at 29.4 degrees, 36.1 degrees, 39.5 degrees and 49.5 degrees, the products corresponding to diffraction peaks are tobermorite, and the products corresponding to the steamed bun peaks are C-S-H gel. The microstructure was observed by SEM as shown in fig. 3 and 4. As is evident from FIG. 3, tobermorite having a sheet-like honeycomb structure in its microstructure is shown, in FIG. 4(a), C-S-H gel is shown, and in FIG. 4(b), tobermorite, amorphous gel C-S-H, and ettringite are shown.
The results of mechanical property tests on 5 groups of materials are shown in fig. 5, which shows that the 28d strength of a sample prepared by using NaOH with the concentration of 3mol/L as an alkali activator is highest and reaches 37.1 MPa.
Example 3: tobermorite-based inorganic cementing material and mechanical property test thereof
1. The preparation method comprises
Taking 200g of 3mol/L sodium hydroxide solution at the temperature of 20 ℃; the coal ash, the slag micro powder and the steel slag micro powder are mixed according to the mass ratio of X:92-X:8, wherein X is 20, 24, 28, 32, 36, 40, 44, 48 and 52 respectively to obtain 9 groups of combined solid waste micro powder; pouring an alkali-activated solution (200g of 3mol/L sodium hydroxide solution) into a pure slurry stirrer container, respectively adding the mixed solid waste micro powder, slowly stirring for 120s, stopping stirring for 15s, and quickly stirring for 120s circularly until the mixture is fully stirred and then pouring the mixture into a mold; and (3) placing the slurry subjected to the die-casting in a curing box with the temperature of 20 ℃ and the relative humidity of 99% for curing and forming to obtain 9 groups of tobermorite-based inorganic cementing materials.
2. Mechanical Property testing of cementitious Material
The results of mechanical property tests on 9 groups of materials are shown in fig. 6, which shows that the 28d compressive strength of the material is the highest and reaches 37.1MPa when the content of fly ash is 24%.
Claims (9)
1. A method for preparing tobermorite-based inorganic cementing material by using alkali-activated solid waste micro powder at normal temperature comprises the following steps:
mixing fly ash, slag micropowder and steel slag micropowder according to a mass ratio X:92-X:8 to serve as a solid waste micropowder raw material, wherein X is 20-52; taking 1-5 mol/L sodium hydroxide solution as an alkali activator, mixing the sodium hydroxide solution and the mixed solid waste micro powder according to the mass ratio of 0.4-0.5:1 at the temperature of 20 +/-2 ℃, then placing the mixture in a slurry mixer for fully stirring and performing mould inversion; and placing the slurry of the reverse mold in a curing box for curing and molding to obtain the tobermorite-based inorganic cementing material.
2. The method for preparing the tobermorite-based inorganic cementing material by using the alkali-activated solid waste micropowder at normal temperature according to claim 1, which is characterized by comprising the following steps of: mixing fly ash, slag micropowder and steel slag micropowder according to a mass ratio of 24:68:8 to serve as solid waste micropowder raw materials, taking 3mol/L sodium hydroxide solution as an alkali activator, mixing the sodium hydroxide solution and the mixed solid waste micropowder according to a mass ratio of 0.4:1 at the temperature of 20 ℃, and then placing the mixture in a paste mixer for fully stirring and reversing a mould; and placing the slurry of the reverse mold in a curing box for curing and molding to obtain the tobermorite-based inorganic cementing material.
3. The method for preparing the tobermorite-based inorganic cementing material by using the alkali-activated solid waste micropowder at normal temperature according to claim 1, which is characterized by comprising the following steps of: the fly ash is F-type fly ash, and the particle size of the F-type fly ash is less than 100 mu m.
4. The method for preparing the tobermorite-based inorganic cementing material by using the alkali-activated solid waste micro powder at normal temperature according to claim 3, which is characterized by comprising the following steps of: the fly ash comprises the following main components in percentage by mass: al (Al)2O3 29.59％、SiO254.7％、CaO 3.97％、Fe2O3 7.79％。
5. The method for preparing the tobermorite-based inorganic cementing material by using the alkali-activated solid waste micropowder at normal temperature according to claim 1, which is characterized by comprising the following steps of: the slag micro powder comprises the following main components in percentage by mass: al (Al)2O3 14.24％、SiO229.75％、CaO 41.45％、Fe2O3 1.7％。
6. The method for preparing the tobermorite-based inorganic cementing material by using the alkali-activated solid waste micropowder at normal temperature according to claim 1, which is characterized by comprising the following steps of: the steel slag micro powder comprises the following main components in percentage by mass: al (Al)2O3 3.8％、SiO216.06％、CaO 46.85％、Fe2O3 21％。
7. The method for preparing the tobermorite-based inorganic cementing material by using the alkali-activated solid waste micropowder at normal temperature according to claim 1, which is characterized by comprising the following steps of: the full stirring condition is that the stirring is carried out by a pure slurry stirrer for 120s at a slow speed, 15s at a stop speed and 120s at a fast speed in a circulating way.
8. The method for preparing the tobermorite-based inorganic cementing material by using the alkali-activated solid waste micropowder at normal temperature according to claim 1, which is characterized by comprising the following steps of: the curing conditions in the curing box were 20 ℃ and 99% relative humidity.
9. The product prepared by the method for preparing the tobermorite-based inorganic cementing material by using alkali-activated solid waste micro powder at normal temperature according to claim 1 or 2.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113797884A (en) * | 2021-09-30 | 2021-12-17 | 东北大学 | Steel slag/fly ash composite waste slag porous adsorption material, preparation method and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2105420A1 (en) * | 2008-03-26 | 2009-09-30 | Council of Scientific&Industrial Research | A composition for building material and a process for the preparation thereof |
| CN104828834A (en) * | 2014-02-12 | 2015-08-12 | 中国科学院过程工程研究所 | Method of preparing tobermorite from fly ash and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2105420A1 (en) * | 2008-03-26 | 2009-09-30 | Council of Scientific&Industrial Research | A composition for building material and a process for the preparation thereof |
| CN104828834A (en) * | 2014-02-12 | 2015-08-12 | 中国科学院过程工程研究所 | Method of preparing tobermorite from fly ash and application thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113797884A (en) * | 2021-09-30 | 2021-12-17 | 东北大学 | Steel slag/fly ash composite waste slag porous adsorption material, preparation method and application |
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