Green low-carbon cement and preparation method thereof
By using induced tempering components and particle size grading technology in cement formulas, the strength and durability problems caused by low clinker content in low-carbon cement formulas are solved, and the effect of low carbon emissions and cost reduction is achieved, ensuring that Cement performance and sustainable development.
Patent Information
- Application Number
- CN202411402606.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2024-12-10
AI Technical Summary
The existing low-carbon cement formula has difficult technical problems in reducing carbon emissions and improving solid waste activity. The low clinker content leads to the inability to guarantee the early strength and durability of cement. The existing technology measures are single and costly, making it difficult to avoid energy. Consumption and raw material cost issues.
Use green and low-carbohydrate cement formulas, including silicate clinker, composite mixtures and gypsum, and control the surface area and particle size grading of cement components by inducing tempering components such as sulfur aluminate cement or waste cement slurry powder. Improve the early and later strength of cement, reduce clinker usage, reduce carbon emissions and production costs.
It significantly reduces CO2 emissions in cement production, reduces waste disposal costs, ensures the early and later strength of cement, avoids resource waste, avoids problems of alkaline and structural instability, and realizes the sustainable development of green and low-carbon cement. develop.
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Abstract
Description
Technical Field
[0001] The invention relates to the technical field of building materials, and in particular to an improvement on a low-carbon composite cement system and a preparation method thereof. Background Art
[0002] Cement is an important basic raw material for national economic construction. Every ton of cement produced emits about 0.65 tons of carbon dioxide (CO2). Carbon emissions from the cement industry come from three parts: emissions from the decomposition of carbonate raw materials such as limestone, accounting for about 58%; emissions from coal combustion during the calcination of cement clinker, accounting for about 35%; emissions from electricity consumption during cement production, accounting for about 7%. In 2023, my country produced 2.02 billion tons of cement, accounting for 49.7% of the world's total, with carbon emissions of about 1.3 billion tons, accounting for more than 13% of the country's total carbon emissions. With the increasing severity of global climate change, reducing CO2 emissions has become the focus of attention of the whole society. Therefore, how to reduce carbon emissions in the cement production process and meet the needs of environmental protection and sustainable development is an important issue that needs to be solved urgently.
[0003] According to the carbon emission structure of cement, the development of low-carbon cement with low clinker content has become an important direction for cement carbon emission reduction, and has also received extensive research and attention. By reducing the amount of silicate clinker in cement and using industrial solid waste such as slag and fly ash as auxiliary cementitious materials, it can not only effectively reduce the carbon emissions of the cement industry, but also reduce the cost of solid waste disposal and cement raw material costs, which is conducive to the comprehensive utilization of resources. However, the existing low-carbon (low clinker) cement formula has a technical problem that is difficult to take into account, namely: the clinker content is low, and the early strength and durability of cement cannot be guaranteed. For general users, they can only simply choose products with high clinker content, resulting in a waste of resources.
[0004] Therefore, how to effectively improve the cementing activity of solid waste mixtures with low-cost measures, give full play to the synergistic effect of clinker and solid waste mixtures, and ensure the performance of cement and its products still needs further research.
[0005] Under the design strength, the amount of cement clinker is minimized and the amount of auxiliary cementitious materials (industrial solid waste) is increased. The primary goal is to achieve efficient activation of solid waste; usually, calcination activation, mechanical activation, alkali-activated chemical activation and other means are used. However, the technical measures adopted in the existing technology are often relatively simple, making it difficult to achieve effective results, and it is impossible to avoid energy consumption and raw material cost issues. At the same time, some technologies such as alkali activation may even cause problems such as efflorescence, volume and structural instability.
[0006] Therefore, how to seek a technical measure with obvious effect, low cost and simple technical process to give full play to the advantages of low-carbon composite cement system and develop green low-carbon cement with performance close to that of silicate cement has become a technical problem that needs to be solved urgently in this field. Summary of the invention
[0007] In response to the above technical problems, the present invention provides a green low-carbon cement and a preparation method thereof which further simplifies the process while ensuring performance and can provide a more accurate clinker dosage range for specific application scenarios.
[0008] The green low-carbon cement of the present invention comprises silicate clinker, composite admixture and gypsum, and also comprises an induced quenching and tempering component. Among them, silicate clinker accounts for 15-49% of the total mass, gypsum accounts for 0.5-5% of the total mass, induced quenching and tempering components account for 2-10% of the total mass, and the rest are composite admixtures; The induced tempering component is sulphoaluminate cement and / or waste cement slurry powder.
[0009] Furthermore, the composite admixture is slag; and at least one or more of limestone, sandstone, volcanic ash admixture and fly ash; compounded with slag.
[0010] Furthermore, in the composite mixed material, the slag specific surface area is 400-800m 2 / kg, the specific surface area of fly ash is 500~800m 2 / kg.
[0011] Furthermore, the silicate clinker and gypsum are mixed and processed to a specific surface area of 300-500m 2 / kg.
[0012] Furthermore, when waste cement slurry powder is used as the induced tempering component, the waste cement slurry powder has a specific surface area of 400-800m 2 / kg.
[0013] Furthermore, when sulphoaluminate cement is used as the induced quenching and tempering component, the specific surface area of the sulphoaluminate cement used is greater than 350 m 2 / kg.
[0014] The method for preparing green low-carbon cement of the present invention is implemented by following the steps: S1, Classification Grinding, Grind the silicate clinker and gypsum mixture to a specific surface area of 300~500m 2 / kg, According to the selection of composite materials, the slag is ground to a surface area of 400~800m2 / kg, fly ash is ground to a specific surface area of 500~800m 2 / kg, According to the selection of induced conditioning components, When waste cement slurry powder is used as the induced conditioning component, the waste cement slurry powder is ground to a specific surface area of 400~800m 2 / kg, and / or when sulphoaluminate cement is used as the induced quenching and tempering component, the specific surface area of the sulphoaluminate cement is greater than 350m 2 / kg.
[0015] S2. The silicate clinker accounts for 15-49% of the total mass, the gypsum accounts for 0.5-5% of the total mass, the induced quenching and tempering component accounts for 2-10% of the total mass, and the rest is a composite admixture; S3, mixing all the raw materials weighed and prepared in step S2 uniformly to obtain.
[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) The green low-carbon cement of the present invention significantly reduces CO2 emissions generated during the cement production process by reducing the amount of clinker used.
[0017] (2) By using industrial waste such as slag and fly ash, the cost and environmental risk of waste disposal are reduced, the consumption of natural resources in the production of silicate clinker is reduced, and the production cost of cement is reduced.
[0018] (3) The present invention also greatly reduces the amount of clinker used, and innovatively proposes the technical measure of an inducer (i.e., an induced conditioning component). By adding sulphoaluminate cement or waste cement slurry powder as an inducer and controlling the fineness of the green low-carbon cement system, the early and late strength of cement is guaranteed, ensuring the excellent performance of cement in practical applications. The working mechanism of the induced conditioning component is: by using the early rapid hydration of sulphoaluminate cement, or by using the hydrated calcium silicate in the waste cement slurry powder as a seed, the green low-carbon cement system is induced to accelerate hydration, thereby achieving the improvement of the early activity of green low-carbon cement. At the same time, based on the particle size grading theory, the specific surface area of the cement component is regulated to achieve the synergistic performance of the early and late performance of the green low-carbon cement system.
[0019] When waste cement slurry powder is used as an inducer, it provides a guarantee for the durability and safety of the building structure, eliminates waste cement as construction waste, saves the cost of using alkali-activated alkaline substances, and avoids the problems of alkali blooming, volume and structural instability caused by the alkali-activated technology in the existing technology, providing another new technical support for the sustainable development of green and low-carbon cement.
[0020] When sulphoaluminate cement is used as an inducer, its high early strength can be used to improve the early performance of green and low-carbon cement. At the same time, sulphoaluminate cement has the functions of reducing carbon and optimizing product volume stability, which can effectively balance performance and carbon emissions.
[0021] The present invention adjusts the particle size distribution of auxiliary cementitious materials such as slag, limestone powder, sandstone, volcanic ash composite materials and fly ash on the basis of gradient control of clinker dosage and adjustment of gypsum dosage, and simultaneously adds sulphoaluminate cement or waste cement slurry powder as a performance induction adjustment component to achieve coordinated performance of the low-clinker system in the early and late stages. It has significant social and economic benefits and avoids resource waste. DETAILED DESCRIPTION
[0022] The overall technical scheme of the green low-carbon cement of the present invention includes silicate clinker, composite admixture and gypsum, and also includes an induced quenching and tempering component. Among them, silicate clinker accounts for 15-49% of the total mass, gypsum accounts for 0.5-5% of the total mass, induced quenching and tempering components account for 2-10% of the total mass, and the rest are composite admixtures; The induced tempering component is sulphoaluminate cement and / or waste cement slurry powder. Under the general concept of induced tempering, the present invention proposes specific technical measures for selecting the two specific induced tempering components, which can simplify the process and save costs.
[0023] The working principle of the induced conditioning component is: the early rapid hydration of sulphoaluminate cement and / or the use of hydrated calcium silicate in the waste cement slurry powder as a seed to induce the green low-carbon cement system to accelerate hydration, thereby improving the early activity of green low-carbon cement. At the same time, based on the particle size distribution theory, the specific surface area of the cement component is regulated to achieve the synergistic performance of the early and late performance of the green low-carbon cement system.
[0024] When the former is used as an inducer, its high early strength can be used to improve the early performance of green and low-carbon cement. At the same time, sulphoaluminate cement has the functions of reducing carbon and optimizing product volume stability, effectively balancing performance and carbon emissions.
[0025] When the latter is used as an inducer, it provides a guarantee for the durability and safety of the building structure, absorbs waste cement, a construction waste, saves the cost of using alkali-activated alkaline substances, and avoids the problems of alkali blooming, volume and structural instability caused by the alkali-activated technology in the existing technology.
[0026] The composite admixture is slag; and at least one or any one or more of limestone, sandstone, volcanic ash admixture and fly ash; compounded with slag. The composite admixture includes slag as an active admixture; it should be emphasized that slag is a required component in the composite admixture in order to play an active role. The other four limestone, sandstone, volcanic ash admixture and fly ash are used as admixtures; the admixtures are selected from at least one or any one or more of limestone, sandstone, volcanic ash admixture and fly ash.
[0027] Five composite mixed materials are selected in the present invention; in view of the factors of technological development, it is difficult for the present invention to exhaustively list equivalents with similar properties to the above five materials, but those skilled in the art may select materials other than the five materials based on the concept of the present invention, which we believe is still within the inventive concept of the present invention and belongs to the protection scope of the present invention.
[0028] In order to give full play to its role, the specific surface area of slag in the composite mixture is 400~800m 2 / kg, the specific surface area of fly ash is 500~800m 2 / kg, the specific surface area of volcanic ash composite material is 500~800m 2 / kg, the specific surface area of limestone is 350~400m 2 / kg, the specific surface area of sandstone is 350~400m 2 / kg. After silicate clinker and gypsum are mixed, they are processed to a specific surface area of 300~500m 2 / kg.
[0029] Among them, when waste cement slurry powder is used as the induced conditioning component, the specific surface area of the waste cement slurry powder is 400~800m 2 / kg. Or when sulphoaluminate cement is used as the induced tempering component, the specific surface area of the sulphoaluminate cement used is greater than 350m 2 / kg. It is explained as follows: the sulphoaluminate cement used as one of the induced conditioning components in the present invention is commercial sulphoaluminate cement, which needs to be selected according to the specific surface area defined above, and will not be repeated in the following embodiments of the present invention; and the other induced conditioning component, the waste cement slurry powder, may be ground according to the specific surface area defined above. The two induced components can be used separately or in combination.
[0030] It should be noted that the waste cement slurry powder in the present invention may come from waste cement slurry or waste cement extracted from waste building materials such as recycled aggregates and recycled mortar.
[0031] The method for preparing green low-carbon cement of the present invention is implemented by following the steps: S1, Classification Grinding, Grind the silicate clinker and gypsum mixture to a specific surface area of 300~500m 2 / kg; According to the selection of composite materials, the slag is ground to a surface area of 400~800m 2 / kg, fly ash is ground to a specific surface area of 500~800m 2 / kg, the specific surface area of volcanic ash composite material is 500~800m 2 / kg, the specific surface area of limestone is 350~400m 2 / kg, the specific surface area of sandstone is 350~400m 2 / kg.
[0032] According to the selection of induced conditioning components, When waste cement slurry powder is used as the induced conditioning component, the waste cement slurry powder is ground to a specific surface area of 400~800m 2 / kg, And / or when sulphoaluminate cement is used as the induced tempering component, the specific surface area of sulphoaluminate cement is greater than 350m 2 / kg; S2. The silicate clinker accounts for 15-49% of the total mass, the gypsum accounts for 0.5-5% of the total mass, the induced quenching and tempering component accounts for 2-10% of the total mass, and the rest is a composite admixture; S3, mixing all the raw materials weighed and prepared in step S2 uniformly to obtain.
[0033] In order to make the application purpose, technical scheme and beneficial technical effects of the present invention application clearer, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the embodiments described in this specification are only for explaining the present application, not for limiting the present application.
[0034] For simplicity, the present invention only explicitly discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form an unambiguous range; and any lower limit can be combined with other lower limits to form an unambiguous range, and any upper limit can be combined with any other upper limit to form an unambiguous range. In addition, although not explicitly stated, each point or single value between the endpoints of the range is included in the range. Thus, each point or single value can be combined with any other point or single value as its own lower limit or upper limit or with other lower limits or upper limits to form an unambiguous range.
[0035] In the description of the present application, it should be noted that, unless otherwise specified, “above” and “below” are inclusive of the number, and the “multiple” in “one or more” means two or more than two.
[0036] The above application content of the present application is not intended to describe each disclosed embodiment or each implementation in the present application. The following description more specifically illustrates exemplary embodiments. In many places throughout the application, guidance is provided by a series of examples, which can be used in various combinations. In each example, enumeration is only used as a representative group and should not be interpreted as exhaustive.
[0037] Weigh each component according to Table 1, mix them evenly to obtain the green low-carbon cement of the present invention.
[0038] Table 1 Cement formula of Examples 1 to 11 (mass fraction %) Embodiment 1: The silicate clinker and desulfurized gypsum are mixed and ground to a specific surface area of 400m 2 / kg. Slag, limestone and fly ash are used as mixed materials and ground separately. The specific surface area of slag is 800m 2 / kg, fly ash specific surface area 600m 2 / kg, limestone specific surface area 380m 2 / kg. The selected induced tempering component: sulphoaluminate cement with a specific surface area greater than 350m 2 / kg. According to GB / T17671-1999 "Test Method for Cement Mortar Strength (ISO Method)", the compressive strength test of the mortar sample prepared by low carbon cement was carried out. The mortar test block of 40mm×40mm×160mm was made by mixing with a water-cement ratio of 0.5 and cured according to the standard. The 3d and 28d compressive strengths were measured to be 24.4MPa and 45.4MPa respectively.
[0039] Embodiment 2: The silicate clinker and desulfurized gypsum are mixed and ground to a specific surface area of 380m 2 / kg. Slag, limestone and fly ash are used as mixed materials and ground separately. The specific surface area of slag is 450m 2 / kg, fly ash specific surface area 500m 2 / kg, limestone specific surface area 350m 2 / kg. The selected induced tempering component: sulphoaluminate cement with a specific surface area greater than 350m 2 / kg. According to GB / T17671-1999 "Test Method for Cement Mortar Strength (ISO Method)", the compressive strength test of the mortar sample prepared by low carbon cement was carried out. The mortar test block of 40mm×40mm×160mm was made by mixing with a water-cement ratio of 0.5 and cured according to the standard. The compressive strength at 3d and 28d was 21.1MPa and 43.7MPa respectively.
[0040] Embodiment 3: The silicate clinker and desulfurized gypsum are mixed and ground to a specific surface area of 420m 2 / kg. Slag, limestone, fly ash, sandstone and volcanic ash composite materials are used as mixed materials and ground separately. The specific surface area of slag is 500m 2 / kg, fly ash specific surface area 700m 2 / kg, limestone specific surface area 400m 2 / kg, sandstone specific surface area 400m 2 / kg, the specific surface area of volcanic ash composite material is 500 m 2 / kg. The selected induced tempering component: sulphoaluminate cement with a specific surface area greater than 350m 2 / kg, waste cement slurry is finely ground to a specific surface area of 400m 2 / kg. According to GB / T17671-1999 "Test Method for Cement Mortar Strength (ISO Method)", the compressive strength test of the mortar sample prepared by low carbon cement was carried out. The mortar test block of 40mm×40mm×160mm was made by mixing with a water-cement ratio of 0.5 and cured according to the standard. The 3d and 28d compressive strengths were measured to be 21.2 MPa and 44.6MPa respectively.
[0041] Embodiment 4: The silicate clinker and desulfurized gypsum are mixed and ground to a specific surface area of 450m 2 / kg. Slag, limestone and fly ash are used as mixed materials and ground separately. The specific surface area of slag is 450m 2 / kg, fly ash specific surface area 600m 2 / kg, limestone specific surface area 350m 2 / kg. The selected induced tempering component: sulphoaluminate cement with a specific surface area greater than 350m 2 / kg. According to GB / T17671-1999 "Test Method for Cement Mortar Strength (ISO Method)", the compressive strength test of the mortar sample prepared by low carbon cement was carried out. The mortar test block of 40mm×40mm×160mm was made by mixing with a water-cement ratio of 0.5 and cured according to the standard. The compressive strength at 3d and 28d was measured to be 19.9MPa and 55.5MPa respectively.
[0042] Embodiment 5: The silicate clinker and desulfurized gypsum are mixed and ground to a specific surface area of 350m 2 / kg. Slag, limestone, fly ash and volcanic ash composite materials are used as mixed materials and ground separately. The specific surface area of slag is 550m 2 / kg, fly ash specific surface area 550m 2 / kg, limestone specific surface area 350m 2 / kg, the specific surface area of volcanic ash composite material is 700 m 2 / kg. The selected induced conditioning component: waste cement slurry powder ground to a specific surface area of 800m 2 / kg. According to GB / T17671-1999 "Test Method for Cement Mortar Strength (ISO Method)", the compressive strength test of the mortar sample prepared by low carbon cement was carried out. The mortar test block of 40mm×40mm×160mm was made by mixing with a water-cement ratio of 0.5 and cured according to the standard. The compressive strength at 3d and 28d was 20.3MPa and 46.0MPa respectively.
[0043] Embodiment 6: The silicate clinker and desulfurized gypsum are mixed and ground to a specific surface area of 370m 2 / kg. Slag, limestone and fly ash are used as mixed materials and ground separately. The specific surface area of slag is 400m 2 / kg, fly ash specific surface area 600m 2 / kg, limestone specific surface area 380m 2 / kg. The selected induced tempering component: sulphoaluminate cement with a specific surface area greater than 350m 2 / kg, waste cement slurry is finely ground to a specific surface area of 600m 2 / kg. According to GB / T17671-1999 "Test Method for Cement Mortar Strength (ISO Method)", the compressive strength test of the mortar sample prepared by low carbon cement was carried out. The mortar test block of 40mm×40mm×160mm was made by mixing with a water-cement ratio of 0.5 and cured according to the standard. The compressive strength at 3d and 28d was measured to be 18.5MPa and 46.7MPa respectively.
[0044] Embodiment 7: The silicate clinker and desulfurized gypsum are mixed and ground to a specific surface area of 500m 2 / kg. Slag, limestone, fly ash and sandstone are used as mixed materials and ground separately. Among them, the specific surface area of slag is 550 m 2 / kg, fly ash specific surface area 800m 2 / kg, limestone specific surface area 380m 2 / kg, sandstone specific surface area 380m 2 / kg. The selected induced tempering component: sulphoaluminate cement with a specific surface area greater than 350m 2 / kg. According to GB / T17671-1999 "Test Method for Cement Mortar Strength (ISO Method)", the compressive strength test of the mortar sample prepared by low carbon cement was carried out. The mortar test block of 40mm×40mm×160mm was made by mixing with a water-cement ratio of 0.5 and cured according to the standard. The compressive strength at 3d and 28d was 23.9MPa and 54.3MPa respectively.
[0045] Embodiment 8: The silicate clinker and desulfurized gypsum are mixed and ground to a specific surface area of 400m 2 / kg. Slag and sandstone are used as mixed materials and ground separately. The specific surface area of slag is 780 m 2 / kg, sandstone specific surface area 400m 2 / kg. The selected induced tempering component: sulphoaluminate cement with a specific surface area greater than 350m 2 / kg, waste cement slurry is finely ground to a specific surface area of 500m 2 / kg. According to GB / T17671-1999 "Test Method for Cement Mortar Strength (ISO Method)", the compressive strength test of the mortar sample prepared by low carbon cement was carried out. The mortar test block of 40mm×40mm×160mm was made by mixing with a water-cement ratio of 0.5 and cured according to the standard. The compressive strength at 3d and 28d was 23.7MPa and 53.8MPa respectively.
[0046] Embodiment 9: The silicate clinker and desulfurized gypsum are mixed and ground to a specific surface area of 400m 2 / kg. Slag, limestone, sandstone, fly ash and volcanic ash are used as mixed materials and ground separately. The specific surface area of slag is 420 m 2 / kg, fly ash specific surface area 600m 2 / kg, limestone specific surface area 350m 2 / kg, sandstone specific surface area 350m 2 / kg, the specific surface area of volcanic ash mixture is 800 m 2 / kg. The selected induced conditioning component: waste cement slurry is finely ground to a specific surface area of 700m 2 / kg. According to GB / T17671-1999 "Test Method for Cement Mortar Strength (ISO Method)", the compressive strength test of the mortar sample prepared by low carbon cement was carried out. The mortar test block of 40mm×40mm×160mm was made by mixing with a water-cement ratio of 0.5 and cured according to the standard. The compressive strength at 3d and 28d was 22.2MPa and 51.5MPa respectively.
[0047] Embodiment 10: The silicate clinker and desulfurized gypsum are mixed and ground to a specific surface area of 300m 2 / kg. Slag, limestone, sandstone and fly ash are used as mixed materials and ground separately. The specific surface area of slag is 400 m 2 / kg, fly ash specific surface area 600m 2 / kg, limestone specific surface area 350m 2 / kg, sandstone specific surface area 350m 2 / kg. The selected induced tempering component: sulphoaluminate cement with a specific surface area greater than 350m 2 / kg. According to GB / T17671-1999 "Test Method for Cement Mortar Strength (ISO Method)", the compressive strength test of the mortar sample prepared by low carbon cement was carried out. The mortar test block of 40mm×40mm×160mm was made by mixing with a water-cement ratio of 0.5 and cured according to the standard. The 3d and 28d compressive strengths were measured to be 20.9MPa and 49.8MPa respectively.
[0048] Embodiment 11: The silicate clinker and desulfurized gypsum are mixed and ground to a specific surface area of 450m 2 / kg. Slag, limestone, fly ash, sandstone and volcanic ash composite materials are used as mixed materials and ground separately, among which, the specific surface area of slag is 550 m 2 / kg, fly ash specific surface area 600m 2 / kg, limestone specific surface area 380m 2 / kg, sandstone specific surface area 380m 2 / kg, the specific surface area of volcanic ash composite material is 600 m 2 / kg. The selected induced tempering component: sulphoaluminate cement with a specific surface area greater than 350m 2 / kg, waste cement slurry is finely ground to a specific surface area of 450m 2 / kg. According to GB / T17671-1999 "Test Method for Cement Mortar Strength (ISO Method)", the compressive strength test of the mortar sample prepared by low carbon cement was carried out. The mortar test block of 40mm×40mm×160mm was made by mixing with a water-cement ratio of 0.5 and cured according to the standard. The 3d and 28d compressive strengths were measured to be 18.0MPa and 46.5MPa respectively.
[0049] It can be seen from the above 11 groups of embodiments that the clinker content in the present invention can be understood as four groups of gradient ranges of 15-21.2%, 21.2-34%, 34-42.5% and 42.5-49%. The feasibility of low-carbon cement formulations under different gradient clinker dosages has been demonstrated; it is convenient for users to choose according to their specific application scenarios. It can be seen from the above specific implementation methods that the low-carbon cement of the present invention controls the gradient range of clinker use while maintaining the excellent strength properties of cement by optimizing the proportion, using inducers, controlling fineness and other measures, which is convenient for accurate control of clinker dosage, has a significant low-carbon effect, and can meet the needs of different application scenarios.
[0050] It should be noted that the above specific implementations are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art should understand that various modifications, equivalent substitutions, changes, etc. can be made to the present invention based on the technical content disclosed in the application documents of the present invention. However, as long as these changes do not deviate from the spirit of the present invention, they should be within the scope of protection of the present invention. In addition, some terms used in the application specification and claims of the present invention are not restrictive, but are only for the convenience of description.
Claims
1. A green low-carbon cement comprising silicate clinker, composite admixture and gypsum, characterized in that: It also includes inducing conditioning components, Among them, silicate clinker accounts for 15-49% of the total mass, gypsum accounts for 0.5-5% of the total mass, induced quenching and tempering components account for 2-10% of the total mass, and the rest are composite admixtures; The induced tempering component is sulphoaluminate cement and / or waste cement slurry powder.
2. A green low-carbon cement according to claim 1, characterized in that: The composite admixture is slag; and at least one or more of limestone, sandstone, volcanic ash admixture and fly ash; compounded with the slag.
3. A green low-carbon cement according to claim 2, characterized in that: In the composite mixed material, the specific surface area of slag is 400~800m 2 / kg, the specific surface area of fly ash is 500~800m 2 / kg.
4. The green low-carbon cement according to claim 1, characterized in that: The silicate clinker and gypsum are mixed and processed to a specific surface area of 300-500m 2 / kg.
5. The green low-carbon cement according to claim 1, characterized in that: When waste cement slurry powder is used as the induced conditioning component, the specific surface area of the waste cement slurry powder is 400-800m 2 / kg.
6. The green low-carbon cement according to claim 1, characterized in that: When sulphoaluminate cement is used as the induced tempering component, the specific surface area of the sulphoaluminate cement used is greater than 350m 2 / kg.
7. A method for preparing green low-carbon cement according to any one of claims 1 to 7, characterized in that: Prepare as follows: S1, Classification Grinding, Grind the silicate clinker and gypsum mixture to a specific surface area of 300~500m 2 / kg, According to the selection of composite materials, the slag is ground to a surface area of 400~800m 2 / kg, fly ash is ground to a specific surface area of 500~800m 2 / kg, According to the selection of induced conditioning components, When waste cement slurry powder is used as the induced conditioning component, the waste cement slurry powder is ground to a specific surface area of 400~800m 2 / kg, and / or when sulphoaluminate cement is used as the induced quenching and tempering component, the specific surface area of the sulphoaluminate cement is greater than 350m 2 / kg; S2. The silicate clinker accounts for 15-49% of the total mass, the gypsum accounts for 0.5-5% of the total mass, the induced quenching and tempering component accounts for 2-10% of the total mass, and the rest is a composite admixture; S3, mixing all the raw materials weighed and prepared in step S2 uniformly to obtain.