CN113200698A - Preparation method of early strength additive for solid waste based cementing material - Google Patents
Preparation method of early strength additive for solid waste based cementing material Download PDFInfo
- Publication number
- CN113200698A CN113200698A CN202110566305.9A CN202110566305A CN113200698A CN 113200698 A CN113200698 A CN 113200698A CN 202110566305 A CN202110566305 A CN 202110566305A CN 113200698 A CN113200698 A CN 113200698A
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- China
- Prior art keywords
- desulfurized gypsum
- slag
- early strength
- mixed
- strength additive
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Classifications
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
- C04B2103/14—Hardening accelerators
Abstract
The invention provides a method for preparing a cementing material early strength additive by using industrial waste residues, which comprises the following steps: calcining the desulfurized gypsum at 600-700 ℃ to obtain anhydrous desulfurized gypsum, and mixing the anhydrous desulfurized gypsum with dihydrate desulfurized gypsum to obtain mixed desulfurized gypsum; the slag, the waste incineration fly ash, the refining slag, the mixed desulfurized gypsum, the calcium aluminate cement, the water and other materials are mixed, heated to react, dried and ground to prepare the early strength additive. The early strength additive can improve the early strength of the solid waste base cementing material, has the characteristics of low cost, environmental protection and the like, and develops a new way for the synergistic utilization and synergy of industrial waste residues.
Description
Technical Field
The invention relates to a method for preparing a solid waste based cementing material early strength additive by using steel slag as a main raw material.
Background
The steel slag is a byproduct generated in the steel production process, and as a large steel country in China generates a large amount of waste slag every year, the steel slag not only occupies land and pollutes the environment, but also causes resource waste, so that the utilization rate of the steel slag is improved, the environmental problem is solved, and the maximum utilization of resources is realized.
The steel slag is rich in minerals such as dicalcium silicate and tricalcium silicate, has certain gelling property, can be used for producing a gelling material, has the advantages of low carbon, environmental protection and waste utilization, and shows great potential in replacing cement in various fields by using the steel slag as a main raw material in recent years. However, the activity of the steel slag is poor, so that the early strength of the prepared cementing material is low, and the application is influenced. For this reason, how to improve the early strength performance of the solid waste based gelling material becomes a hot spot of current research.
The steel slag and the gypsum are subjected to hydrothermal reaction in an alkaline environment to generate hydration products, such as ettringite and the like, which are main sources of the strength of the cementing material, and the waste incineration fly ash, the calcium aluminate cement and the like are added to contribute to strengthening the process. The product is added into the waste residue-based gelling material, so that the hydration and hardening processes of the system can be directionally induced and strengthened, the hydration product is optimized, and the early strength of the system is improved.
The invention takes blast furnace slag, refining slag, waste incineration fly ash and calcined desulfurization gypsum as main raw materials, and prepares the early strength auxiliary agent through heating reaction, thereby improving the early strength of the solid waste-based cementing material and realizing the value-added utilization of waste slag.
Disclosure of Invention
Aiming at the problems, the invention provides a preparation method of the early strength auxiliary agent for the solid waste-based cementing material, which can improve the early strength of the slag-based cementing material.
A preparation method of an early strength additive for a solid waste based gelling material comprises the following specific steps:
1) calcining the desulfurized gypsum at 600-700 ℃ for 1h to obtain anhydrous desulfurized gypsum;
2) mixing anhydrous desulfurized gypsum and dihydrate desulfurized gypsum to obtain mixed desulfurized gypsum;
3) mixing slag, waste incineration fly ash, mixed desulfurized gypsum, calcium aluminate cement, refining slag and water, standing at normal temperature for 48 hours, reacting at 70-80 ℃ for 24 hours, drying and grinding to prepare the early strength additive.
In the step 2), the anhydrous desulfurized gypsum accounts for 30-70% of the weight of the mixed desulfurized gypsum.
In the step 3), the specific surface area of the slag and the refining slag is 350 m2/kg～500m2/kg。
Further, the early strength additive material comprises 80-90% of slag, 1-5% of waste incineration fly ash, 6-10% of mixed desulfurized gypsum, 2-5% of calcium aluminate cement and 2-5% of refining slag, and the added water accounts for 30-40% of the weight of the solid material.
The waste incineration fly ash is generated in the waste incineration process and mainly comprises 16-36% of CaO and SiO2 5%～20%、Al2O3 1%～13%、MgO 1%～4%、K2O 0.5%～8%、Na2O 1%～4%、Fe2O3 1-4%, inorganic chloride and sulfate, etc.
Further, the specific surface area of the early strength auxiliary agent is 350 m2/kg～500m2/kg。
The refining slag is sintering type refining slag.
The slag is water-quenched granulated blast furnace slag.
The early strength auxiliary agent can be mixed with materials such as steel slag, barium slag, modified desulfurized gypsum, calcium aluminate cement, anhydrous sodium sulphate and the like to prepare a cementing material, and can improve the early strength and the later strength of the solid waste based cementing material.
The invention has the following positive beneficial effects: the invention utilizes the composite hydration product generated by the reaction of slag, waste incineration fly ash, mixed desulfurized gypsum, aluminate cement and refining slag as the early strength auxiliary agent, can play a good role in inducing and exciting the hydration process of the solid waste base cementing material, and improves the early strength and the later strength of the solid waste base cementing material.
Detailed Description
The following describes in detail preferred embodiments of the present invention, examples of which are carried out in accordance with GB/T17671-1999 method for testing the strength of cement mortar (ISO method). The specific surface area of the slag used in the examples was 436 m2Per kg, specific surface area of refining slag is 442 m2Per kg, the specific surface area of the steel slag is 447 m2The specific surface area of the barium slag is 458m2The specific surface area of the early strength additive is 446 m2/kg。
Comparative example (without early strength addition)
27.3 percent of steel slag, 48 percent of slag, 10 percent of barium slag, 11 percent of modified desulfurized gypsum, 3 percent of calcium aluminate cement and 0.7 percent of anhydrous sodium sulphate are mixed to prepare a cementing material, 42 percent of water (additionally added with 0.3 part of water reducing agent) is added to be stirred to prepare a cement mortar test piece, and the cement mortar test piece is subjected to strength test after being maintained to an age.
Example one
1) Calcining the desulfurized gypsum at 700 ℃ for 1h to obtain anhydrous desulfurized gypsum;
2) the anhydrous desulfurized gypsum accounts for 30 percent of the weight of the mixed desulfurized gypsum;
3) mixing 85% of slag, 5% of waste incineration fly ash, 7% of mixed desulfurized gypsum, 5% of calcium aluminate cement, 3% of refining slag and 35% of water, standing at normal temperature for 48 hours, then reacting at 70-80 ℃ for 24 hours, drying, and grinding to prepare the early strength additive;
4) 1% of steel slag in the comparative example was replaced with 1% of the early strength assistant to prepare cement mortar test pieces, which were cured to age and then subjected to strength testing.
Example two
1) Calcining the desulfurized gypsum at 600 ℃ for 1h to obtain anhydrous desulfurized gypsum;
2) the anhydrous desulfurized gypsum accounts for 45 percent of the weight of the mixed desulfurized gypsum;
3) mixing 90% of slag, 2% of waste incineration fly ash, 6% of mixed desulfurized gypsum, 2% of calcium aluminate cement, 2% of refining slag and 35% of water, standing at normal temperature for 48 hours, then reacting at 70-80 ℃ for 24 hours, drying and grinding to prepare the early strength additive;
4) 2 percent of early strength additive is used for replacing 2 percent of steel slag in the comparative example to prepare a cement mortar test piece, and the test piece is subjected to strength test after being maintained to the age.
EXAMPLE III
1) Calcining the desulfurized gypsum at 650 ℃ for 1h to obtain anhydrous desulfurized gypsum;
2) the anhydrous desulfurized gypsum accounts for 30 to 70 percent of the weight of the mixed desulfurized gypsum;
3) mixing 82% of slag, 4% of waste incineration fly ash, 10% of mixed desulfurized gypsum, 3% of calcium aluminate cement, 5% of refining slag and 35% of water, standing at normal temperature for 48 hours, then reacting at 70-80 ℃ for 24 hours, drying, and grinding to prepare the early strength additive;
4) 3 percent of early strength additive is used for replacing 3 percent of steel slag in the comparative example to prepare a cement mortar test piece, and the test piece is subjected to strength test after being maintained to the age.
Example four
1) Calcining the desulfurized gypsum at 650 ℃ for 1h to obtain anhydrous desulfurized gypsum;
2) the anhydrous desulfurized gypsum accounts for 70 percent of the weight of the mixed desulfurized gypsum;
3) mixing 84% of slag, 1% of waste incineration fly ash, 9% of mixed desulfurized gypsum, 4% of calcium aluminate cement, 3% of refining slag and 35% of water, standing at normal temperature for 48 hours, then reacting at 70-80 ℃ for 24 hours, drying, and grinding to prepare the early strength additive;
4) 4 percent of early strength additive is used for replacing 4 percent of steel slag in the comparative example to prepare a cement mortar test piece, and the test piece is subjected to strength test after being maintained to the age.
The above examples illustrate the substance of the present invention, but do not limit the scope of the present invention. It will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the true spirit and scope of the invention.
Claims (8)
1. A preparation method of an early strength additive for a solid waste based gelling material comprises the following specific steps:
1) calcining the desulfurized gypsum at 600-700 ℃ for 1h to obtain anhydrous desulfurized gypsum;
2) mixing anhydrous desulfurized gypsum and dihydrate desulfurized gypsum to obtain mixed desulfurized gypsum;
3) mixing slag, waste incineration fly ash, mixed desulfurized gypsum, calcium aluminate cement, refining slag and water, standing at normal temperature for 48 hours, reacting at 70-80 ℃ for 24 hours, drying and grinding to prepare the early strength additive.
2. The method of claim 1, wherein: in the step 2), the anhydrous desulfurized gypsum accounts for 30-70% of the weight of the mixed desulfurized gypsum.
3. The method of claim 1, wherein: the early strength auxiliary agent material comprises 80-90% of slag, 1-5% of waste incineration fly ash, 6-10% of mixed desulfurized gypsum, 2-5% of calcium aluminate cement and 2-5% of refining slag.
4. The method of claim 1, wherein: in the step 3), the specific surface area of the slag and the refining slag is 350 m2/kg～500m2/kg。
5. The method of claim 1, wherein: the waste incineration fly ash is generated in the waste incineration process and mainly comprises 16-36% of CaO and SiO2 5%～20%、Al2O3 1%～13%、MgO 1%～4%、K2O 0.5%～8%、Na2O 1%～4%、Fe2O3 1-4%, inorganic chloride and sulfate, etc.
6. The method of claim 1, wherein: the specific surface area of the early strength auxiliary agent is 350 m2/kg～500m2/kg。
7. The method of claim 1, wherein: the refining slag is sintering type refining slag.
8. The method of claim 1, wherein: the slag is water-quenched granulated blast furnace slag.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114276056A (en) * | 2021-12-21 | 2022-04-05 | 邯郸市建业建设工程质量检测有限公司 | Method for preparing autoclaved sand-lime brick by synergistic utilization of multiple solid wastes |
| CN114455866A (en) * | 2022-01-07 | 2022-05-10 | 武汉科技大学 | CaO-MgO-SiO for mine filling2-H2O-shaped cementing material and preparation method thereof |
| CN115259826A (en) * | 2022-09-29 | 2022-11-01 | 河北化工医药职业技术学院 | Solid waste base 3D printing material |
| CN114890693B (en) * | 2022-06-20 | 2023-03-28 | 涉县清漳水泥制造有限公司 | Solid waste base gelling material and preparation method and application thereof |
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Application publication date: 20210803 |
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