A production method of superfine grinding high-strength and durable portland cement

Abstract

The application discloses a production method of superfine grinding high-strength and durable Portland cement, and particularly relates to the field of light building materials. The method realizes surface amorphization by fluidized bed plasma activation of raw materials; directional generation of high-iron phase clinker is realized by low-temperature sintering in a pulse electric field and addition of C2S seeds; three-stage gradient grinding is adopted: vertical roller grinding with addition of polycarboxylate, CO2 mineralization grinding and vibration grinding with addition of silane coupling agent; and finally, a core-shell nano reinforcing agent is compounded to prepare cement. The method improves the percentage of solid waste in the total mass of raw materials to be greater than or equal to 40%, reduces sintering energy consumption, makes the compressive strength of the product to be greater than or equal to 35 MPa at 3d, greater than or equal to 75 MPa at 28d, and the loss after 300 times of freeze-thaw to be less than or equal to 1.5%, and forms a core mesoporous SiO2 and a shell anatase TiO2, so that the performance of the cement is significantly optimized, and carbon sequestration and emission reduction are realized.

Description

Technical Field

[0001] This invention relates to the field of lightweight building materials, and specifically to a method for producing ultrafine ground high-strength durable silicate cement. Background Technology

[0002] In the field of lightweight building materials, silicate cement has long held a core position in construction engineering and infrastructure projects due to its wide applicability. Its strength, durability, and production economy directly affect the quality and service life of projects. However, current traditional silicate cement production processes and product performance are no longer sufficient to fully meet the demands of modern engineering for high-performance materials, low energy consumption, high resource utilization, and low carbon emissions, resulting in several prominent technical challenges.

[0003] Solid waste resource utilization is inefficient and unstable. In traditional processes, industrial solid waste is often tried to be incorporated into cement raw materials, but due to the stable crystalline structure of its surface and extremely low reactivity, it is difficult to react fully with other cement components, resulting in a generally low utilization rate, often failing to exceed 30%. Simultaneously, the composition of solid waste is easily affected by factors such as its source and production process, leading to significant fluctuations in the performance of finished cement products. Key indicators such as compressive strength and durability exhibit large fluctuations, failing to meet the stringent requirements of high-precision engineering for consistent material performance, thus limiting the large-scale, high-proportion application of solid waste in cement production. Clinker sintering is energy-intensive and produces suboptimal product quality. Traditional silicate cement clinker sintering requires temperatures above 1450℃, consuming large amounts of energy, which does not meet the low-carbon production requirements under current dual-carbon goals. Furthermore, uneven mineral crystallization during high-temperature sintering easily generates excessive free CaO. Free CaO continues to react and expand in the later stages of cement hydration, leading to cracking and reduced strength in the cement stone, severely impacting the long-term stability and durability of cement products. Traditional cement grinding often employs single-equipment methods for simple particle size refinement, prioritizing fineness over efficiency. On one hand, particle agglomeration during grinding limits the actual increase in specific surface area, resulting in a slow hydration reaction rate between cement and water. This leads to insufficient and unevenly distributed CSH gel, affecting both early and later compressive strength. On the other hand, the grinding process lacks functionalization treatments, failing to optimize the surface properties and internal structure of cement particles. This results in high porosity after hardening, reducing density and providing pathways for moisture and harmful ions, exacerbating freeze-thaw damage and chemical corrosion. After 300 freeze-thaw cycles, mass loss often exceeds 3%, failing to meet durability requirements in harsh conditions such as frigid regions and marine environments. Furthermore, effective methods for low-carbonization and performance enhancement are lacking. Traditional processes fail to integrate carbon emission reduction with grinding and performance enhancement. Not only do they fail to effectively control carbon emissions during production, but they also waste the potential value of CO2. At the same time, the later-stage performance enhancement of cement relies heavily on traditional admixtures, which have relatively simple functions and cannot achieve the synergistic effect of strength enhancement, durability enhancement, and harmful ion blocking. Especially when facing complex service environments, the comprehensive performance of cement products, such as frost resistance, impermeability, and chemical erosion resistance, is insufficient and cannot meet the requirements of long-term service.

[0004] To address the technical bottlenecks in the production and application of traditional silicate cement, existing technologies have not yet proposed a systematic solution: some improved processes only address single problems and have not formed a complete process optimization of raw material activation, clinker control, grinding functionalization, and formulation synergy; and there is a lack of innovative applications of nanoscale reinforcing materials, which cannot improve the internal structure of cement at the microscopic level. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present invention provide a method for producing ultrafine ground high-strength durable silicate cement, which solves the problems of insufficient compressive strength, impermeability and chemical erosion resistance of cement products.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A method for producing ultrafine milled high-strength and durable silicate cement specifically includes the following steps: S1: The raw material mixture is activated by fluidized bed plasma to make the surface amorphous and improve the reaction activity; S2: Sinter the product obtained in S1 at low temperature and add... -C2S, and place the sintering environment in a pulsed electric field to directionally generate high-iron phase clinker; S3: Place the product sintered by S2 into a vertical roller mill, and add polycarboxylate powder for grinding. S4: Place the grinding product from S3 into a CO2 mineralization grinding equipment and introduce CO2 for grinding while stirring; S5: Place the powdered product from S4 into a high-frequency vibratory mill, and simultaneously add KH-550 silane coupling agent to grind it to obtain activated clinker powder; S6: Activated clinker powder, desulfurized gypsum, citric acid, and nano-reinforcing agent are uniformly compounded to prepare silicate cement.

[0007] Preferably, the S1 raw material mixture comprises 65-70 parts by weight of limestone and 30-35 parts by weight of a quaternary solid waste mixture. The system consists of 2-5 parts by weight of Al2O3 and 5-10 parts by weight of borosilicate, with a fluidized bed plasma activation power of 15kW and an Ar / O2 atmosphere.

[0008] Preferably, the main components of the quaternary solid waste mixture are blast furnace slag, fly ash, steel slag, and coal gangue, with a component ratio of 10-15:8-12:5-8:5-7.

[0009] Preferably, the sintering temperature in S2 is 1200–1300°C, and 2–3 parts by weight of [unspecified ingredient] are added simultaneously. -C2S.

[0010] Preferably, the intensity of the pulsed electric field in S2 is 3kV / cm, the pulse frequency is 50Hz, and the prepared ferrous phase clinker C4AF≥12%.

[0011] Preferably, S3 contains 0.1 to 1 part by weight of polycarboxylate, and is pulverized to a particle size ≤ 45. .

[0012] Preferably, the particle size of the particles crushed in S4 is ≤15. CO2 is injected at a rate of 2 L / min while stirring.

[0013] Preferably, 0.05 to 1 part by weight of KH-550 silane coupling agent is added to S5, and the mixture is pulverized to a particle size ≤5 mm. .

[0014] Preferably, the nano-reinforcing agent used in S6 has a core-shell structure. The main component of the outer shell is anatase TiO2 with a pore size of 5-10 nm, and the main component of the core is mesoporous SiO2 with a pore size of 20-50 nm. The outer shell and the core are connected by silane bonds to form a core-shell structure.

[0015] Preferably, the clinker powder used in S6 consists of 60-90 parts by weight, 4-5 parts by weight of desulfurized gypsum, 2-5 parts by weight of citric acid, and 5-10 parts by weight of nano-reinforcing agent, based on a total cement product weight of 100 parts by weight.

[0016] The effects and advantages of the production method of ultrafine grinding high-strength durable silicate cement of the present invention: 1. In this invention, plasma amorphization is used in the preparation process, which increases the activity of solid waste by 50%.

[0017] 2. This invention enables the directional growth of seed crystals under the action of a pulsed electric field, with a sintering temperature 250°C lower than the traditional sintering temperature and a free CaO generation of <50%.

[0018] 3. This invention introduces CO2 into the grinding mill to achieve CO2 mineralization gradient grinding, thereby solidifying carbon and filling pores in the intermediate grinding section.

[0019] 4. In this invention, the nano-reinforcing agent added to the final proportion of silicate cement has a core of mesoporous SiO2 and a shell of anatase TiO2, which plays a dual role of adsorption and catalysis protection.

[0020] 5. The silicate cement prepared by this invention is a multi-source solid waste compound system, and its composition can adaptively fluctuate.

[0021] 6. This invention uses high-energy particle impact to amorphize the surface of solid waste, breaking the original stable crystal structure, exposing a large number of active sites, and greatly improving the reactivity of solid waste with subsequent cement components.

[0022] 7. This invention adopts... -C2S acts as an active nucleating agent, promoting uniform growth of cement clinker minerals while reducing internal porosity and structural defects in the clinker and regulating the direction of crystal growth.

[0023] 8. This invention significantly increases the specific surface area of ​​cement by refining the particle size, thereby accelerating the hydration reaction between cement and water to generate more dense CSH gel.

[0024] 9. This invention significantly enhances the surface activity of solid waste through plasma activation, thereby achieving low-temperature sintering. Fluidized bed plasma is used to bombard the solid waste mixture; high-energy particles impact the solid waste surface, disrupting its original stable crystalline structure and causing it to become amorphous. During the sintering process, a pulsed electric field is applied, causing ions to migrate and recombine under the influence of the electric field. -C2S acts as a nucleating agent, guiding the clinker ore to grow along a specific crystal orientation. Polycarboxylate adsorption on the particle surface provides electrostatic repulsion and steric hindrance. During the grinding process, CO2 is introduced, which reacts with Ca(OH)2 to generate calcium carbonate, filling the pores between particles. The silane coupling agent reacts chemically with the surface of cement particles in the vibratory mill to form Si-O-Si bonds, improving the interfacial bonding between particles and the matrix. Attached Figure Description

[0025] Figure 1 This is a flow chart of a production method for ultrafine grinding of high-strength and durable silicate cement proposed in this invention. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0028] Example 1

[0029] This embodiment provides a method for producing ultrafine milled high-strength and durable silicate cement, the specific implementation steps of which include: Experimental materials: Clinker powder composition: 65 parts by weight of limestone, 30 parts by weight of quaternary solid waste mixture, -Al2O3 2 parts by weight, boron-magnesium iron ore 2 parts by weight, 1 part by weight -C2S, 0.1 parts by weight of polycarboxylate, 0.1 parts by weight of KH-550 silane coupling agent; Other components: 86 parts by weight of clinker powder, 4 parts by weight of desulfurized gypsum, 2 parts by weight of citric acid, and 8 parts by weight of nano-reinforcing agent (core: mesoporous SiO2; shell: anatase TiO2).

[0030] Experimental objective: The performance instability caused by the fluctuation of solid waste composition is solved by using a three-stage gradient activation process, a quaternary solid waste coupling formula and a dynamic thermodynamic model. At the same time, an electric field is used to assist the directional alignment of seed crystals.

[0031] Experimental steps: S1: The solid waste mixture is activated by a 15kW fluidized bed plasma with Ar / O2 (Ar:O2=9:1) to make the surface amorphous and improve the reactivity. S2: The product obtained in S1 is sintered at 1250℃ at a low temperature and then added... -C2S, the sintering environment was placed in a pulsed electric field of 3kV / cm and 50Hz, and the content of C4AF in the high ferric phase clinker was analyzed by XRD. S3: The product sintered from S2 is first placed in a vertical roller mill, and polycarboxylate is added simultaneously until the target particle size is ≤45. ; S4: Place the powdered product from S3 into a CO2 mineralization grinding equipment, and while stirring, introduce CO2 at a rate of 2L / min until the target particle size is ≤15. ; S5: Place the powdered product from S4 into a high-frequency vibratory mill, and simultaneously add silane coupling agent until the target particle size is ≤5. ; S6: Activated clinker powder, desulfurized gypsum, citric acid, and nano-reinforcing agent (core: mesoporous SiO2; shell: anatase TiO2) are uniformly compounded to prepare silicate cement.

[0032] Experimental results: See Table 1 for details. Table 1: Test Results of Example 1 This invention achieves surface amorphization of raw materials through fluidized bed plasma activation, significantly enhancing reactivity; a pulsed electric field is introduced and added during low-temperature sintering at 1250℃. -C2S seed crystals were used to directionally generate high-iron phase clinker, and free CaO was reduced by 50%. (Reference) Figure 1Example 1 employs a three-stage gradient grinding process: vertical roller mill → CO2 mineralization grinding → high-frequency vibration mill; finally, a core-shell nano-reinforcing agent is compounded. The cement produced achieves a solid waste percentage of ≥42% of the total raw material mass, and its performance far exceeds traditional standards: 3-day compressive strength ≥38MPa, 28-day strength ≥80MPa, and mass loss ≤1.8% after 300 freeze-thaw cycles, achieving a breakthrough solution to the industry pain points of high energy consumption, low solid waste utilization, and insufficient durability.

[0033] Example 2

[0034] This embodiment provides a method for producing ultrafine milled high-strength and durable silicate cement, using different weight parts of clinker and other components. The specific implementation steps include: Experimental materials: Clinker powder composition: 60 parts by weight of limestone, 35 parts by weight of quaternary solid waste mixture, -Al2O3 2 parts by weight, boron-magnesium iron ore 2 parts by weight, 1 part by weight -C2S, 0.1 parts by weight of polycarboxylate, 0.1 parts by weight of KH-550 silane coupling agent; Other components: 86 parts by weight of clinker powder, 4 parts by weight of desulfurized gypsum, 2 parts by weight of citric acid, and 8 parts by weight of nano-reinforcing agent (core: mesoporous SiO2; shell: anatase TiO2).

[0035] Experimental objective: A three-stage gradient activation process is used to progressively enhance the reactivity of calcium silicate minerals. The proportions of each component are controlled by a quaternary solid waste coupling formula and a dynamic thermodynamic model to solve the performance instability caused by fluctuations in solid waste composition. An electric field is used to assist in the directional alignment of seed crystals.

[0036] Experimental steps: S1: The solid waste mixture is activated by a 15kW fluidized bed plasma with Ar / O2 (Ar:O2=9:1) to make the surface amorphous and improve the reactivity. S2: The product obtained in S1 is sintered at 1250℃ at a low temperature and then added... -C2S, the sintering environment was placed in a pulsed electric field of 3kV / cm and 50Hz, and the content of C4AF in the high ferric phase clinker was analyzed by XRD. S3: The product sintered from S2 is first placed in a vertical roller mill, and polycarboxylate is added simultaneously until the target particle size is ≤45. ; S4: Place the powdered product from S3 into a CO2 mineralization grinding equipment, and while stirring, introduce CO2 at a rate of 2L / min until the target particle size is ≤15. ; S5: Place the powdered product from S4 into a high-frequency vibratory mill, and simultaneously add silane coupling agent until the target particle size is ≤5. ; S6: Activated clinker powder, desulfurized gypsum, citric acid, and nano-reinforcing agent (core: mesoporous SiO2; shell: anatase TiO2) are uniformly compounded to prepare silicate cement.

[0037] Experimental results: See Table 2 for details. Table 2: Test Results of Example 2 Limestone and solid waste are used as the main materials. After amorphization by 15kW plasma activation, the mixture is directionally sintered in a pulsed electric field at 1250℃, with simultaneous addition of... - C2S seed crystals are used to generate high-iron phase clinker; through three-stage gradient grinding: polycarboxylate grinding aid → CO2 mineralization and carbon fixation → silane coupling agent modification, and finally compounded with core-shell nano-reinforcing agents. The resulting cement achieves a solid waste percentage of ≥40% of the total raw material mass, with comprehensively optimized performance: 3-day compressive strength ≥35MPa, 28-day strength ≥75MPa, and mass loss ≤1.5% after 300 freeze-thaw cycles, verifying that it still maintains ultra-high durability under high solid waste load, and reduces freeze-thaw loss by more than 50% compared with traditional processes.

[0038] Comparative Example 1 This embodiment provides a traditional method for preparing silicate cement, the specific implementation steps of which include: Experimental materials: CaO 60-65 parts by weight, clay 5-10 parts by weight, iron powder 1-2 parts by weight, sandstone 1-2 parts by weight.

[0039] Experimental objective: Silicate cement is prepared using traditional methods.

[0040] Experimental steps: S1: Mix the raw materials in proportion and feed them into a ball mill to grind them into raw meal powder of qualified fineness to ensure sufficient reaction during subsequent calcination; S2: Raw meal powder is fed into a rotary kiln and reacted at a high temperature of about 1450℃ to remove moisture from the raw meal, decompose CO2, and cause CaO and SiO2 to react to generate tricalcium silicate, dicalcium silicate, tricalcium aluminate, and tetracalcium aluminoferrite. Finally, it is cooled to obtain cement clinker. S3: Mix cement clinker with an appropriate amount of gypsum, then send it to a ball mill for further grinding, and finally prepare silicate cement products with fineness that meet the standards.

[0041] Experimental results: See Table 3 for details. Table 3: Test Results of Comparative Example 1 Comparative Example 1 used a traditional method to prepare silicate cement. The experimental raw materials were 60-65 parts CaO, 5-10 parts clay, 1-2 parts iron powder, and 1-2 parts sandstone. The raw materials were first mixed in proportion and then ground into a fine powder using a ball mill. The raw powder was then fed into a rotary kiln at approximately 1450℃ to react, removing moisture and decomposing CO2. This reaction allowed CaO to react with SiO2 to form tricalcium silicate, dicalcium silicate, tricalcium aluminate, and tetracalcium aluminoferrite. After cooling, cement clinker was obtained. Finally, the cement clinker was mixed with an appropriate amount of gypsum and ball-milled again to produce a finished product with the required fineness. The test results were: 3-day compressive strength 25-32 MPa, 28-day compressive strength 43-50 MPa, mass loss after 300 freeze-thaw cycles ≤3%, solid waste percentage of total raw material mass 0%, and C4AF content 6-10%.

[0042] Example 1 used 65 parts by weight of limestone, 30 parts by weight of a quaternary solid waste mixture, and other raw materials. The mixture was activated by fluidized bed plasma, sintered at 1250℃ under a low-temperature pulsed electric field, and then supplemented with... -C2S seed crystals, combined with a three-stage gradient grinding process, are finally compounded with a core-shell structured nano-reinforcing agent. The resulting cement exhibits excellent comprehensive performance: 3-day compressive strength ≥38 MPa, 28-day compressive strength ≥80 MPa, mass loss ≤1.8% after 300 freeze-thaw cycles, solid waste accounting for ≥42% of the total raw material mass, and high-iron phase C4AF content in the clinker ≥13%. This embodiment significantly outperforms traditional processes in terms of strength, durability, and resource utilization, demonstrating the comprehensive advantages of this invention in high-activity solid waste utilization, low-temperature sintering, functionalized grinding, and nano-reinforcing.

[0043] Example 2 slightly adjusted the raw material ratio, using 60 parts by weight of limestone and 35 parts by weight of quaternary solid waste, while maintaining essentially the same process conditions as Example 1. Its performance indicators were: 3-day compressive strength ≥ 35 MPa, 28-day compressive strength ≥ 75 MPa, freeze-thaw loss ≤ 1.5%, solid waste accounting for ≥ 40% of the total raw material mass, and C4AF content ≥ 12%. Although the solid waste utilization rate was higher, its strength was slightly lower than that of Example 1, but still significantly higher than traditional cement, and it exhibited excellent freeze-thaw performance, verifying that the present invention can maintain high durability and stability even under high solid waste loads.

[0044] Comparative Example 1 was prepared using a traditional silicate cement process, with raw materials including conventional limestone and clay, through high-temperature sintering at 1450℃ and ordinary ball milling. Its performance was as follows: 3-day compressive strength 25–32 MPa, 28-day compressive strength 43–50 MPa, freeze-thaw loss ≤3%, solid waste utilization rate 0%, and C4AF content only 6–10%. All indicators were significantly lower than those of the embodiments of this invention, especially in early strength, durability, solid waste utilization rate, and energy consumption, highlighting the limitations and sustainability of traditional processes.

[0045] The comparison shows that Example 1 performs best in terms of strength development, solid waste utilization rate and clinker mineral regulation. It has the highest compressive strength at 3 days and 28 days, a solid waste utilization rate of over 42%, and extremely low freeze-thaw loss. Its overall performance is significantly better than Example 2 and Comparative Example 1, which fully demonstrates the technical advantages of this invention in achieving high strength, high durability, high solid waste content and low-temperature and low-carbon production.

[0046] Those skilled in the art will recognize that the modules and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0047] In addition, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module.

[0048] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.

[0049] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for producing ultrafine ground high-strength durable silicate cement, characterized in that, Specifically, the following steps are included: S1: The raw material mixture is activated by fluidized bed plasma to make the surface amorphous and improve the reaction activity; S2: Sinter the product obtained in S1 at low temperature and add... -C2S, and place the sintering environment in a pulsed electric field to directionally generate high-iron phase clinker; S3: Place the product sintered by S2 into a vertical roller mill, and add polycarboxylate powder for grinding. S4: Place the grinding product from S3 into a CO2 mineralization grinding equipment and introduce CO2 for grinding while stirring; S5: Place the powdered product from S4 into a high-frequency vibratory mill, and simultaneously add KH-550 silane coupling agent to grind it to obtain activated clinker powder; S6: Activated clinker powder, desulfurized gypsum, citric acid, and nano-reinforcing agent are uniformly compounded to prepare silicate cement.

2. The method for producing ultrafine milled high-strength durable silicate cement as described in claim 1, characterized in that, The S1 raw material mixture contains 65-70 parts by weight of limestone and 30-35 parts by weight of a quaternary solid waste mixture. - 2-5 parts by weight of Al2O3 and 5-10 parts by weight of borosilicate iron ore, with a fluidized bed plasma activation power of 15kW, and the system is in an Ar / O2 atmosphere.

3. The method for producing ultrafine ground high-strength durable silicate cement as described in claim 2, characterized in that, The main components of the quaternary solid waste mixture are blast furnace slag, fly ash, steel slag, and coal gangue, with a component ratio of 10-15:8-12:5-8:5-7.

4. The method for producing ultrafine milled high-strength durable silicate cement as described in claim 1, characterized in that, The sintering temperature in S2 is 1200–1300℃, and 2–3 parts by weight are added simultaneously. -C2S.

5. The method for producing ultrafine milled high-strength durable silicate cement as described in claim 1, characterized in that, The intensity of the pulsed electric field in S2 is 3kV / cm, the pulse frequency is 50Hz, and the prepared high-iron phase clinker C4AF≥12%.

6. The method for producing ultrafine milled high-strength durable silicate cement as described in claim 1, characterized in that, S3 contains 0.1 to 1 part by weight of polycarboxylate, and is pulverized to a particle size ≤ 45. .

7. The method for producing ultrafine milled high-strength durable silicate cement as described in claim 1, characterized in that, In step S4, the particles are crushed to a particle size ≤15. CO2 is injected at a rate of 2 L / min while stirring.

8. The method for producing ultrafine ground high-strength durable silicate cement as described in claim 1, characterized in that, In step S5, 0.05–1 part by weight of KH-550 silane coupling agent is added, and the mixture is pulverized to a particle size ≤5 mm. .

9. The method for producing ultrafine milled high-strength durable silicate cement as described in claim 1, characterized in that, The nano-reinforcing agent used in S6 has a core-shell structure. The main component of the outer shell is anatase TiO2 with a pore size of 5-10 nm, and the main component of the core is mesoporous SiO2 with a pore size of 20-50 nm. The outer shell and the core are connected by silane bonds to form a core-shell structure.

10. The method for producing ultrafine milled high-strength durable silicate cement as described in claim 1, characterized in that, The clinker powder used in S6 consists of 60-90 parts by weight, 4-5 parts by weight of desulfurized gypsum, 2-5 parts by weight of citric acid, and 5-10 parts by weight of nano-reinforcing agent, calculated based on a total cement product weight of 100 parts by weight.

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