An enhanced high-efficiency cement activation grinding aid and its preparation method

Abstract

The present invention relates to the technical field of cement additives, and in particular to a kind of enhanced high-efficiency cement activation grinding aid and preparation method thereof, wherein the cement activation grinding aid is made up of the raw materials of the following parts by weight: 10-20 parts of ethylene glycol, 10-25 parts of propylene glycol, 5-8 parts of rice husk ash, 15-20 parts of urea, 10-18 parts of triisopropanolamine, 10-15 parts of polyols, 5-10 parts of surfactants, 2-7 parts of water reducers, 3-10 parts of flower-shaped composite nanoparticles, and 50-60 parts of water. The cement activation grinding aid in the present invention, by applying the flower-shaped composite nanoparticles prepared to prepare cement grinding aid, has larger specific surface area and excellent tribological properties, can form a firm structure with material, so that fluidity can be improved, and then agglomeration is prevented, while also having the effect of grinding aid and lubrication, significantly improving grinding efficiency when smaller doping amount, so as to achieve the effect of efficient grinding aid.

Description

Technical Field

[0001] The invention relates to the technical field of cement additives, in particular to an enhanced high-efficiency cement activation grinding aid and a preparation method thereof. Background Art

[0002] Cement is one of the basic materials in the construction industry and is widely used in the construction of roads, bridges, houses and other fields. The production and sales volume of cement in my country is huge, but the cement industry is a heavy industry and a high-energy-consuming industry. This is mainly because the cement production process requires the grinding of cement raw materials and clinker. The energy consumption in the grinding process is high and the energy utilization rate is extremely low. Because when cement particles are refined, they tend to agglomerate automatically due to their large surface energy. Studies have found that when the specific surface area of ​​cement particles is less than 350m 2 / Kg, and unit energy consumption below 20kW·h / t, cement fineness increases linearly with grinding time. Once the particle size becomes smaller, part of the energy will be used for deagglomeration. Therefore, most of the energy in the grinding process is consumed in ineffective heat such as deagglomeration. Adding an appropriate amount of grinding aid during the cement grinding process can effectively help improve grinding efficiency and prevent agglomeration. The working principle of grinding aids is to achieve physical and chemical modification of the particle surface through their surface activity and charge dispersion effects, exerting interfacial effects. This can increase the specific surface area of ​​cement, optimize cement particle gradation, and improve cement strength and quality while maintaining the same cement output and mill power consumption.

[0003] For example, the invention patent with announcement number CN112851177A discloses a cement grinding aid and cement using the cement grinding aid. The cement grinding aid is prepared by stirring and mixing the following raw materials in parts by mass: 10-20 parts of triisopropanolamine, 10-15 parts of ethylene glycol, and 10-15 parts of gluconic acid; the preparation method is: putting the cement grinding aid and the cement raw materials into a ball mill at a mass ratio of 1:250 and grinding them for 30 minutes to obtain cement. The cement grinding aid of the present application can be used in cement production and has the advantage of improving the strength of cement; however, the cement grinding aid can only exert its grinding aid performance as a single substance, and after standing, self-agglomeration and precipitation will occur, resulting in low grinding efficiency and failure to achieve the effect of efficient grinding aid. Summary of the Invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide an enhanced high-efficiency cement activated grinding aid and a preparation method thereof.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An enhanced high-efficiency cement activation grinding aid, which is prepared from the following raw materials in parts by weight: 10-20 parts of ethylene glycol, 10-25 parts of propylene glycol, 5-8 parts of rice husk ash, 15-20 parts of urea, 10-18 parts of triisopropanolamine, 10-15 parts of polyol, 5-10 parts of surfactant, 2-7 parts of water reducer, 3-10 parts of flower-shaped composite nanoparticles, and 50-60 parts of water;

[0007] The polyol is a polyether polyol;

[0008] The surfactant is at least one of disodium lauryl sulfosuccinate, disodium coconut monoethanolamide sulfosuccinate and monolauryl phosphate;

[0009] The water reducer is a polycarboxylate water reducer.

[0010] As a further preferred embodiment of the present invention, the preparation method of the flower-shaped composite nanoparticles is as follows:

[0011] 1) adding melamine and β-cyclodextrin to deionized water in sequence, stirring thoroughly, transferring the mixture to a hydrothermal reactor, placing the mixture in an oven, reacting the mixture at 180-190° C. for 24-30 hours, cooling the mixture to room temperature, washing the mixture, drying the mixture, placing the mixture in a muffle furnace, heating the mixture from room temperature to 550-570° C. at a rate of 2-3° C. / min, and calcining the mixture. After the calcination is complete, the mixture is cooled to room temperature and fully ground to obtain porous nanosheets;

[0012] 2) The porous nanosheets and flower-shaped nanoparticles are sequentially added to a three-dimensional vibration ball mill at a vibration frequency of 1400-1800 r / min, with a ball-to-material mass ratio of (10-15):1, anhydrous ethanol as the ball milling medium, and a ball milling time of 20-40 min. After the ball milling is completed, the product is centrifuged, filtered, and thoroughly washed with deionized water, and then dried to obtain flower-shaped composite nanoparticles.

[0013] As a further preferred embodiment of the present invention, in step 1), the ratio of melamine, β-cyclodextrin and deionized water is (4-10) g: (5-15) mg: (60-100) mL;

[0014] The calcination time is 4-9 hours.

[0015] As a further preferred embodiment of the present invention, in step 2), the mass ratio of the porous nanosheets to the flower-shaped nanoparticles is (80-90):(10-20).

[0016] As a further preferred embodiment of the present invention, the preparation method of the flower-shaped nanoparticles is as follows:

[0017] 1) Potassium iodide was dissolved in deionized water and magnetically stirred for 10-30 minutes to obtain solution A. Bismuth nitrate pentahydrate was dissolved in deionized water and magnetically stirred for 10-30 minutes to obtain solution B. Solution B was then slowly added dropwise to an equal volume of solution A under magnetic stirring, and stirring was continued until a brick-red solution was formed. The solution was centrifuged, filtered, and dried to obtain carrier particles.

[0018] 2) Dissolve potassium hydroxide in deionized water, stir to dissolve, then add melamine, stir thoroughly, and centrifuge to dry. Then, place the mixture in a crucible, place it in a muffle furnace, react at 530-550° C. for 4-6 hours, and grind to obtain a loaded powder.

[0019] 3) Add the carrier particles to deionized water, stir thoroughly, then add the load powder, and mechanically stir at 500-800 rpm for 8-12 hours, supplemented by intermittent ultrasonic treatment at 200-300 W. The ultrasonic treatment interval is 10-20 minutes, and the treatment time is 5-10 minutes. After the treatment is completed, the product is centrifuged, filtered, and dried to obtain flower-shaped nanoparticles.

[0020] As a further preferred embodiment of the present invention, in step 1), the ratio of potassium iodide and deionized water in solution A is (0.4-0.7) g: (20-50) mL;

[0021] In the solution B, the ratio of bismuth nitrate pentahydrate to deionized water is (3-6) mmol: (20-50) mL.

[0022] As a further preferred embodiment of the present invention, in step 2), the usage ratio of potassium hydroxide, deionized water and melamine is (0.3-0.7) g: (30-70) mL: (10-20) g.

[0023] As a further preferred embodiment of the present invention, in step 3), the ratio of the carrier particles, deionized water, and loaded powder is (0.3-0.6) g: (20-50) mL: (0.1-0.2) g.

[0024] A method for preparing an enhanced high-efficiency cement activated grinding aid comprises the following steps:

[0025] The raw materials are weighed according to the ratio, and the flower-shaped composite nanoparticles are added to propylene glycol and ultrasonically dispersed evenly. Then, ethylene glycol, rice husk ash, urea, triisopropanolamine, polyol, surfactant, water reducer and water are added in sequence. The ultrasonic dispersion is continued, and the mixture is stirred and allowed to stand to obtain the desired high-efficiency cement activation grinding aid.

[0026] As a further preferred embodiment of the present invention, the ultrasonic dispersion power is 200-300W, and the dispersion time is 20-40min;

[0027] The stirring speed is 500-800 r / min, and the stirring time is 1-2h;

[0028] The standing time is 10-16 hours.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] In the present invention, melamine and biomacromolecule cyclodextrin are hydrothermally self-assembled and then calcined to synthesize porous nanosheets with a porous structure, and then the synthesized bismuth oxyiodide is used as carrier particles, and the synthesized lamellar load powder is loaded on the carrier particles through mechanical stirring and ultrasonic assistance. The lamellar load powder is stacked on each other to construct and assemble into a petal-like structure, thereby obtaining flower-like nanoparticles. Since a large number of convex lamellar structures are formed on the surface of the substance, it has a large specific surface area and can form a good combination with the porous nanosheets. Moreover, since the contact area between the two is large, the combination has a good bonding strength and is not easy to separate. Then the two are placed in a ball mill. During the ball milling process, the porous nanosheets are deformed due to the extrusion of the tank wall and the grinding balls. At the same time, a large number of microscopic defects such as dislocations and vacancies are accumulated inside the porous nanosheets, causing microscopic cracks. Moreover, as the ball milling time increases, it becomes difficult for dislocations to multiply inside the nanosheets, thereby obtaining flower-like nanoparticles. Over-slip reduces the internal energy of the grains, and the slip of dislocations leads to the generation of new interfaces. The newly generated interfaces have large specific surface energy. Under the action of mechanical force, it is very easy for the flower-like nanoparticles to embed into the pores of the porous nanosheets, so that the two are combined together to form flower-like composite nanoparticles; the large number of flower-like structures on the surface of the flower-like composite nanoparticles give it a large specific surface area. At the same time, slip easily occurs between the nanosheet structures contained therein, so that it has good tribological properties. When this substance is introduced into cement, its large specific surface area can be easily adsorbed on the surface of the material, and its flower-like structure can be easily embedded in the defects on the surface of the material, so that it can form a strong structure with the material, thereby improving fluidity and preventing agglomeration. At the same time, its excellent tribological properties help to play the role of grinding aid and lubrication, significantly improving the grinding efficiency at a smaller doping amount. The ground material has a larger specific surface area and smaller sieve residue, further reducing the grinding cost and improving the grinding quality.

[0031] The cement activated grinding aid of the present invention is prepared by applying the prepared flower-shaped composite nanoparticles to the cement grinding aid. The flower-shaped composite nanoparticles have a large specific surface area and excellent tribological properties, can form a firm structure with the material, thereby improving fluidity and preventing agglomeration, and also have the functions of grinding aid and lubrication. The grinding efficiency is significantly improved at a small doping amount, thereby achieving a high-efficiency grinding aid effect. DETAILED DESCRIPTION

[0032] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0033] In the embodiment of the present invention, the polyol is a polyether polyol purchased from Shandong Bluestar Dongda Co., Ltd., brand DL-3000D; the surfactant is disodium lauryl sulfosuccinate; and the water reducer is a polycarboxylate water reducer purchased from Hubei Shanshufeng Building Materials Technology Co., Ltd., brand SSF-4000.

[0034] Example 1

[0035] An enhanced high-efficiency cement activation grinding aid, the cement activation grinding aid is made from the following raw materials in parts by weight: 10 parts of ethylene glycol, 10 parts of propylene glycol, 5 parts of rice husk ash, 15 parts of urea, 10 parts of triisopropanolamine, 10 parts of polyol, 5 parts of surfactant, 2 parts of water reducer, 3 parts of flower-shaped composite nanoparticles, and 50 parts of water;

[0036] The preparation method of the cement activated grinding aid specifically comprises the following steps:

[0037] The raw materials were weighed according to the ratio, and the flower-shaped composite nanoparticles were added to propylene glycol. The mixture was ultrasonically dispersed at 200 W for 20 minutes. Then, ethylene glycol, rice husk ash, urea, triisopropanolamine, polyol, surfactant, water reducer and water were added in sequence. The mixture was ultrasonically dispersed evenly, stirred at 500 r / min for 1 hour, and then allowed to stand for 10 hours to obtain the desired high-efficiency cement activation grinding aid.

[0038] The preparation method of flower-shaped composite nanoparticles is as follows:

[0039] 1) Dissolve 0.4 g of potassium iodide in 20 mL of deionized water and stir magnetically for 10 min to obtain solution A. Dissolve 3 mmol of bismuth nitrate pentahydrate in 20 mL of deionized water and stir magnetically for 10 min to obtain solution B. Then, under magnetic stirring, slowly add solution B dropwise to an equal volume of solution A. Stir until a brick-red solution is formed. Centrifuge, filter, and dry the solution to obtain carrier particles.

[0040] 2) Dissolve 0.3 g of potassium hydroxide in 30 mL of deionized water, stir to dissolve, then add 10 g of melamine, stir thoroughly, and centrifuge to dry. Then, place the mixture in a crucible, place it in a muffle furnace, react at 530° C. for 4 h, and grind to obtain a loaded powder.

[0041] 3) 0.3 g of carrier particles were added to 20 mL of deionized water, thoroughly stirred, and then 0.1 g of the loading material powder was added. The mixture was mechanically stirred at 500 rpm for 8 h, supplemented with intermittent ultrasonic treatment at 200 W for 5 min at intervals of 10 min. After the treatment was complete, the product was centrifuged, filtered, and dried to obtain flower-shaped nanoparticles.

[0042] 4) 4 g of melamine and 5 mg of β-cyclodextrin were sequentially added to 60 mL of deionized water, stirred thoroughly, transferred to a hydrothermal reactor, placed in an oven, and reacted at 180° C. for 24 h. After cooling to room temperature, the product was washed, dried, and placed in a muffle furnace. It was heated from room temperature to 550° C. at a rate of 2° C. / min and calcined for 4 h. After the calcination was completed, it was cooled to room temperature and fully ground to obtain porous nanosheets.

[0043] 5) The porous nanosheets and flower-shaped nanoparticles were sequentially added into a three-dimensional vibration ball mill in a mass ratio of 80:20, with a vibration frequency of 1400 r / min, a ball-to-material mass ratio of 10:1, anhydrous ethanol as the ball milling medium, and a ball milling time of 20 min. After the ball milling was completed, the product was centrifuged, filtered, and thoroughly washed with deionized water. After drying, the flower-shaped composite nanoparticles were obtained.

[0044] Example 2

[0045] An enhanced high-efficiency cement activation grinding aid, the cement activation grinding aid is made from the following raw materials in parts by weight: 15 parts of ethylene glycol, 18 parts of propylene glycol, 7 parts of rice husk ash, 18 parts of urea, 15 parts of triisopropanolamine, 12 parts of polyol, 7 parts of surfactant, 5 parts of water reducer, 7 parts of flower-shaped composite nanoparticles, and 55 parts of water;

[0046] The preparation method of the cement activated grinding aid specifically comprises the following steps:

[0047] The raw materials were weighed according to the ratio, and the flower-shaped composite nanoparticles were added to propylene glycol. The mixture was ultrasonically dispersed at 250W for 30 minutes, and then ethylene glycol, rice husk ash, urea, triisopropanolamine, polyol, surfactant, water reducer and water were added in sequence. The mixture was ultrasonically dispersed evenly, and then stirred at 700r / min for 1.5 hours. The mixture was then allowed to stand for 15 hours to obtain the desired high-efficiency cement activation grinding aid.

[0048] The preparation method of flower-shaped composite nanoparticles is as follows:

[0049] 1) Dissolve 0.5 g of potassium iodide in 30 mL of deionized water and stir magnetically for 20 min to obtain solution A. Dissolve 5 mmol of bismuth nitrate pentahydrate in 40 mL of deionized water and stir magnetically for 20 min to obtain solution B. Then, under magnetic stirring, slowly add solution B dropwise to an equal volume of solution A. Stir until a brick-red solution is formed. Centrifuge, filter, and dry to obtain carrier particles.

[0050] 2) Dissolve 0.5 g of potassium hydroxide in 50 mL of deionized water, stir to dissolve, then add 15 g of melamine, stir thoroughly, and centrifuge to dry. Then, place the mixture in a crucible, place it in a muffle furnace, and react at 540° C. for 5 h. Grind to obtain a loaded powder.

[0051] 3) 0.5 g of carrier particles were added to 40 mL of deionized water, stirred thoroughly, and then 0.2 g of the loading material powder was added. The mixture was mechanically stirred at 700 rpm for 10 h, supplemented with intermittent ultrasonic treatment at 250 W for 7 min at intervals of 15 min. After the treatment, the product was centrifuged, filtered, and dried to obtain flower-shaped nanoparticles.

[0052] 4) 8 g of melamine and 10 mg of β-cyclodextrin were sequentially added to 80 mL of deionized water, stirred thoroughly, transferred to a hydrothermal reactor, placed in an oven, and reacted at 185° C. for 28 h. After cooling to room temperature, the product was washed, dried, and placed in a muffle furnace. It was heated from room temperature to 560° C. at a rate of 3° C. / min and calcined for 7 h. After the calcination was completed, it was cooled to room temperature and fully ground to obtain porous nanosheets.

[0053] 5) The porous nanosheets and flower-shaped nanoparticles were sequentially added into a three-dimensional vibration ball mill in a mass ratio of 85:15, with a vibration frequency of 1600 r / min, a ball-to-material mass ratio of 13:1, anhydrous ethanol as the ball milling medium, and a ball milling time of 30 min. After the ball milling was completed, the product was centrifuged, filtered, and thoroughly washed with deionized water. After drying, the flower-shaped composite nanoparticles were obtained.

[0054] Example 3

[0055] An enhanced high-efficiency cement activation grinding aid, the cement activation grinding aid is made from the following raw materials in parts by weight: 20 parts of ethylene glycol, 25 parts of propylene glycol, 8 parts of rice husk ash, 20 parts of urea, 18 parts of triisopropanolamine, 15 parts of polyol, 10 parts of surfactant, 7 parts of water reducer, 10 parts of flower-shaped composite nanoparticles, and 60 parts of water;

[0056] The preparation method of the cement activated grinding aid specifically comprises the following steps:

[0057] The raw materials were weighed according to the ratio, and the flower-shaped composite nanoparticles were added to propylene glycol. Ultrasonic dispersion was performed at 300W for 40 minutes, and then ethylene glycol, rice husk ash, urea, triisopropanolamine, polyol, surfactant, water reducer and water were added in sequence. Ultrasonic dispersion was continued until uniform, and the mixture was stirred at 800r / min for 2 hours, and then allowed to stand for 16 hours to obtain the required high-efficiency cement activation grinding aid.

[0058] The preparation method of flower-shaped composite nanoparticles is as follows:

[0059] 1) Dissolve 0.7 g of potassium iodide in 50 mL of deionized water and stir magnetically for 30 min to obtain solution A. Dissolve 6 mmol of bismuth nitrate pentahydrate in 50 mL of deionized water and stir magnetically for 30 min to obtain solution B. Then, under magnetic stirring, slowly add solution B dropwise to an equal volume of solution A. Stir until a brick-red solution is formed. Centrifuge, filter, and dry to obtain carrier particles.

[0060] 2) Dissolve 0.7 g of potassium hydroxide in 70 mL of deionized water, stir to dissolve, then add 20 g of melamine, stir thoroughly, and centrifuge to dry. Then, place the mixture in a crucible, place it in a muffle furnace, react at 550° C. for 6 h, and grind to obtain a loaded powder.

[0061] 3) 0.6 g of carrier particles were added to 50 mL of deionized water, thoroughly stirred, and then 0.2 g of the load powder was added. The mixture was mechanically stirred at 800 rpm for 12 h, supplemented with intermittent ultrasonic treatment at 300 W for 10 min at intervals of 20 min. After the treatment was complete, the product was centrifuged, filtered, and dried to obtain flower-shaped nanoparticles.

[0062] 4) 10 g of melamine and 15 mg of β-cyclodextrin were sequentially added to 100 mL of deionized water, stirred thoroughly, transferred to a hydrothermal reactor, placed in an oven, and reacted at 190° C. for 30 h. After cooling to room temperature, the product was washed, dried, and placed in a muffle furnace, heated from room temperature to 570° C. at a rate of 3° C. / min, and calcined for 9 h. After the calcination was completed, the product was cooled to room temperature and fully ground to obtain porous nanosheets;

[0063] 5) The porous nanosheets and flower-shaped nanoparticles were sequentially added into a three-dimensional vibration ball mill in a mass ratio of 90:10, the vibration frequency was 1800 r / min, the ball-to-material mass ratio was controlled to be 15:1, the ball milling medium was anhydrous ethanol, and the ball milling time was 40 min. After the ball milling was completed, the product was centrifuged, filtered, and thoroughly washed with deionized water. After drying, the flower-shaped composite nanoparticles were obtained.

[0064] Comparative Example 1: This comparative example is basically the same as Example 1, except that it does not contain flower-shaped composite nanoparticles.

[0065] Comparative Example 2: This comparative example is basically the same as Example 1, except that step 1) is omitted in the preparation of the flower-shaped composite nanoparticles.

[0066] Comparative Example 3: This comparative example is basically the same as Example 1, except that in the preparation of the flower-shaped composite nanoparticles, steps 1) to 3) are omitted.

[0067] Comparative Example 4: This comparative example is basically the same as Example 1, except that step 4) is omitted in the preparation of the flower-shaped composite nanoparticles.

[0068] Comparative Example 5: This comparative example is basically the same as Example 1, except that, in the preparation of the flower-shaped composite nanoparticles, steps 4) to 5) are omitted.

[0069] Test experiment:

[0070] PC42.5 cement was selected, and the grinding aids obtained in Examples 1-3 and Comparative Examples 1-5 were added respectively, with the addition amount of the grinding aid being 0.03% of the total mass. The grinding fineness and cement properties were tested. The specific test results are shown in Table 1.

[0071] Table 1 Cement grinding performance test results of the grinding aids obtained from Examples 1-3 and Comparative Examples 1-5

[0072]

[0073]

[0074] As can be seen from Table 1, the grinding aid in the present invention can effectively increase the specific surface area of ​​cement, increase its fineness, and achieve an efficient grinding aid effect.

[0075] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An enhanced high-efficiency cement activated grinding aid, characterized in that: The cement activated grinding aid is prepared from the following raw materials in parts by weight: 10-20 parts of ethylene glycol, 10-25 parts of propylene glycol, 5-8 parts of rice husk ash, 15-20 parts of urea, 10-18 parts of triisopropanolamine, 10-15 parts of polyol, 5-10 parts of surfactant, 2-7 parts of water reducer, 3-10 parts of flower-shaped composite nanoparticles, and 50-60 parts of water; The polyol is a polyether polyol; The surfactant is at least one of disodium lauryl sulfosuccinate, disodium coconut monoethanolamide sulfosuccinate and monolauryl phosphate; The water reducer is a polycarboxylate water reducer; The preparation method of flower-like nanoparticles is as follows: 1) Dissolve potassium iodide in deionized water and stir magnetically for 10-30 minutes to obtain solution A. Dissolve bismuth nitrate pentahydrate in deionized water and stir magnetically for 10-30 minutes to obtain solution B. Then, under magnetic stirring, slowly add solution B dropwise to an equal volume of solution A. Stir continuously until a brick-red solution is formed. Centrifuge, filter, and dry to obtain carrier particles. 2) Dissolve potassium hydroxide in deionized water, stir to dissolve, then add melamine, stir thoroughly, and centrifuge to dry. Then, place the mixture in a crucible, place it in a muffle furnace, and react at 530-550°C for 4-6 hours. Grind to obtain a loaded powder. 3) Add the carrier particles to deionized water, stir thoroughly, then add the load powder, and mechanically stir at 500-800 rpm for 8-12 hours, supplemented by intermittent ultrasonic treatment at 200-300W, with an interval of 10-20 minutes and a treatment time of 5-10 minutes. After the treatment is completed, the product is centrifuged, filtered, and dried to obtain flower-shaped nanoparticles; The preparation method of the flower-shaped composite nanoparticles is as follows: 4) Melamine and β-cyclodextrin are sequentially added to deionized water, stirred thoroughly, transferred to a hydrothermal reactor, placed in an oven, and reacted at 180-190°C for 24-30 hours. After cooling to room temperature, the product is washed, dried, and placed in a muffle furnace, heated from room temperature to 550-570°C at a rate of 2-3°C / min, and calcined. After the calcination is completed, the product is cooled to room temperature and fully ground to obtain porous nanosheets. 5) The porous nanosheets and flower-shaped nanoparticles are sequentially added to a three-dimensional vibrating ball mill at a vibration frequency of 1400-1800 r / min. The ball-to-material mass ratio is controlled to be (10-15):

1. The ball milling medium is anhydrous ethanol, and the ball milling time is 20-40 min. After the ball milling is completed, the product is centrifuged, filtered, and thoroughly washed with deionized water. After drying, the flower-shaped composite nanoparticles are obtained.

2. An enhanced high-efficiency cement activated grinding aid according to claim 1, characterized in that: In step 4), the ratio of melamine, β-cyclodextrin, and deionized water is (4-10) g: (5-15) mg: (60-100) mL; The calcination time is 4-9 hours.

3. An enhanced high-efficiency cement activation grinding aid according to claim 1, characterized in that: In step 5), the mass ratio of the porous nanosheets to the flower-shaped nanoparticles is (80-90): (10-20).

4. An enhanced high-efficiency cement activation grinding aid according to claim 1, characterized in that: In step 1), the ratio of potassium iodide to deionized water in solution A is (0.4-0.7) g: (20-50) mL; In the solution B, the ratio of bismuth nitrate pentahydrate to deionized water is (3-6) mmol: (20-50) mL.

5. An enhanced high-efficiency cement activation grinding aid according to claim 1, characterized in that: In step 2), the usage ratio of potassium hydroxide, deionized water, and melamine is (0.3-0.7) g: (30-70) mL: (10-20) g.

6. The enhanced high-efficiency cement activated grinding aid according to claim 1, characterized in that: In step 3), the ratio of the carrier particles, deionized water, and loaded powder is (0.3-0.6) g: (20-50) mL: (0.1-0.2) g.

7. The method for preparing an enhanced high-efficiency cement activated grinding aid according to any one of claims 1 to 6, characterized in that: The specific steps include: The raw materials are weighed according to the ratio, and the flower-shaped composite nanoparticles are added to propylene glycol and ultrasonically dispersed evenly. Then, ethylene glycol, rice husk ash, urea, triisopropanolamine, polyol, surfactant, water reducer and water are added in sequence. The ultrasonic dispersion is continued, and the mixture is stirred and allowed to stand to obtain the desired high-efficiency cement activation grinding aid.

8. The method for preparing an enhanced high-efficiency cement activated grinding aid according to claim 7, wherein: The ultrasonic dispersion power is 200-300W, and the dispersion time is 20-40min; The stirring speed is 500-800 r / min, and the stirring time is 1-2h; The standing time is 10-16 hours.

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