Enhanced efficient cement activation grinding aid and preparation method thereof

Abstract

The invention relates to the technical field of cement auxiliaries, in particular to an enhanced efficient cement activation grinding aid and a preparation method thereof. The cement activation grinding aid is prepared from the following raw materials in parts by weight: 10 to 20 parts of ethylene glycol, 10 to 25 parts of propylene glycol, 5 to 8 parts of rice hull ash, 15 to 20 parts of urea, 10 to 18 parts of triisopropanolamine, 10 to 15 parts of polyol, 5 to 10 parts of a surfactant, 2 to 7 parts of a water reducing agent, 3 to 10 parts of flower-like composite nanoparticles and 50 to 60 parts of water. According to the cement activation grinding aid disclosed by the invention, the prepared flower-shaped composite nanoparticles are applied to preparation of the cement grinding aid, and the cement activation grinding aid has a relatively large specific surface area and excellent tribological performance and can form a firm structure with materials, so that the fluidity can be improved, agglomeration is prevented, and meanwhile, the cement activation grinding aid also has grinding aiding and lubricating effects; and the grinding efficiency is remarkably improved when the doping amount is small, so that the efficient grinding assisting effect is achieved.

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 fields of road, bridge, and house construction. 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, which consumes a lot of energy and has a very low energy utilization rate. 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 is less than 20KW·h / t, the cement fineness will increase linearly with the 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 invalid heat such as deagglomeration. Adding an appropriate amount of grinding aids during the cement grinding process can effectively help improve the grinding efficiency and prevent agglomeration. The working principle of the grinding aid is to achieve physical and chemical modification of the particle surface through its surface activity and charge dispersion, and exert the interface effect. It can increase the specific surface area of ​​cement, optimize the cement particle grading, and improve the strength and quality of cement under 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 thereof is: putting the cement grinding aid and the cement raw material into a ball mill at a mass ratio of 1:250 for grinding 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 existence, 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 activation 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 oil 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 to a hydrothermal kettle, placing in an oven, reacting at 180-190° C. for 24-30 hours, cooling to room temperature, washing the product, drying it, placing it in a muffle furnace, heating it from room temperature to 550-570° C. at a rate of 2-3° C. / min, and calcining it, cooling it to room temperature after the calcination is completed, and grinding it thoroughly to obtain a porous nanosheet;

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

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

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

[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) Dissolve potassium iodide in deionized water, stir magnetically for 10-30 min to obtain solution A, dissolve bismuth nitrate pentahydrate in deionized water, stir magnetically for 10-30 min to obtain solution B, then slowly drip solution B into an equal volume of solution A under magnetic stirring, keep stirring until a brick red solution is formed, centrifuge, filter and dry to obtain carrier particles;

[0018] 2) dissolving potassium hydroxide in deionized water, stirring and dissolving, adding melamine, stirring thoroughly, centrifuging and drying, then putting into a crucible, placing in a muffle furnace, reacting at 530-550° C. for 4-6 hours, and grinding to obtain a loaded powder;

[0019] 3) Add the carrier particles into deionized water, stir thoroughly, then add the load powder, stir mechanically at 500-800 r / min for 8-12 h, and assist with intermittent ultrasonic treatment at 200-300 W, the ultrasonic treatment interval is 10-20 min, the treatment time is 5-10 min, 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), in the solution A, the ratio of potassium iodide to deionized water 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 usage ratio of the carrier particles, deionized water, and load 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] Weigh the raw materials according to the ratio, add the flower-shaped composite nanoparticles into propylene glycol, and disperse them evenly by ultrasonication. Then, add ethylene glycol, rice husk ash, urea, triisopropanolamine, polyol, surfactant, water reducer and water in sequence, continue to disperse them evenly by ultrasonication, and then stir and stand for treatment 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 500-800r / min, and the stirring time is 1-2h;

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

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

[0030] In the present invention, melamine and biomacromolecule cyclodextrin are subjected to hydrothermal self-assembly and then calcined to synthesize a porous nanosheet with a porous structure, and then the synthesized bismuth iodide is used as a carrier particle, and the synthesized lamellar load powder is loaded on the carrier particle through mechanical stirring and ultrasonic assistance. The lamellar load powder is stacked and assembled to form 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 nanosheet. 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 put into a ball mill. During the ball milling process, the porous nanosheet is deformed due to the extrusion of the tank wall and the grinding ball. At the same time, a large number of microscopic defects such as dislocations and vacancies are gathered inside the porous nanosheet, causing microscopic cracks. Moreover, as the ball milling time is prolonged, it becomes difficult for dislocations to multiply inside the nanosheet, thereby obtaining a flower-like nanoparticle. 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 be embedded in 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, so that it has good tribological properties. When the 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, and significantly improve the grinding efficiency at a smaller doping amount. The ground material has a larger specific surface area and a smaller screen 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, which has 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 has the functions of grinding aid and lubrication, and significantly improves the grinding efficiency at a small doping amount, thereby achieving a high-efficiency grinding aid effect. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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., with the brand name DL-3000D; the surfactant is disodium lauryl sulfosuccinate; and the water reducer is a polycarboxylic acid water reducer purchased from Hubei Shanshufeng Building Materials Technology Co., Ltd., with the brand name SSF-4000.

[0034] Example 1

[0035] An enhanced high-efficiency cement activation grinding aid, which is prepared 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] Weigh each raw material according to the ratio, add the flower-shaped composite nanoparticles into propylene glycol, ultrasonically disperse at 200 W for 20 minutes, then add ethylene glycol, rice husk ash, urea, triisopropanolamine, polyol, surfactant, water reducer and water in sequence, continue to ultrasonically disperse evenly, then stir at 500 r / min for 1 hour, and then stand for 10 hours to obtain the required high-efficiency cement activation grinding aid.

[0038] Wherein, the preparation method of flower-shaped composite nanoparticles is as follows:

[0039] 1) 0.4 g potassium iodide was dissolved in 20 mL deionized water, and magnetically stirred for 10 min to obtain solution A; 3 mmol bismuth nitrate pentahydrate was dissolved in 20 mL deionized water, and magnetically stirred for 10 min to obtain solution B; then, under magnetic stirring, solution B was slowly dripped into an equal volume of solution A, and stirring was maintained until a brick-red solution was formed, and the solution was centrifuged, filtered, and dried to obtain carrier particles;

[0040] 2) Dissolve 0.3 g potassium hydroxide in 30 mL deionized water, stir to dissolve, add 10 g melamine, stir thoroughly, centrifuge and dry, then put into a crucible, place 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, and after sufficient stirring, 0.1 g of load powder was added, and mechanical stirring was performed at 500 r / min for 8 h, and intermittent ultrasonic treatment was performed at 200 W. The ultrasonic treatment interval was 10 min, and the treatment time was 5 min. After the treatment was completed, 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 added to 60 mL of deionized water in sequence, and after being fully stirred, the mixture was transferred to a hydrothermal kettle, 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, and heated from room temperature to 550° C. at a rate of 2° C. / min, and calcined for 4 h. After the calcination was completed, the mixture was cooled to room temperature, and after being fully ground, a porous nanosheet was obtained;

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

[0044] Example 2

[0045] An enhanced high-efficiency cement activation grinding aid, which is prepared 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] Weigh each raw material according to the ratio, add the flower-shaped composite nanoparticles into propylene glycol, ultrasonically disperse at 250 W for 30 minutes, then add ethylene glycol, rice husk ash, urea, triisopropanolamine, polyol, surfactant, water reducer and water in sequence, continue to ultrasonically disperse evenly, then stir at 700 r / min for 1.5 hours, and then stand for 15 hours to obtain the required high-efficiency cement activation grinding aid.

[0048] Wherein, the preparation method of flower-shaped composite nanoparticles is as follows:

[0049] 1) 0.5 g potassium iodide was dissolved in 30 mL deionized water, and magnetically stirred for 20 min to obtain solution A; 5 mmol bismuth nitrate pentahydrate was dissolved in 40 mL deionized water, and magnetically stirred for 20 min to obtain solution B; then, under magnetic stirring, solution B was slowly dripped into an equal volume of solution A, and stirring was maintained until a brick-red solution was formed, and the solution was centrifuged, filtered, and then dried to obtain carrier particles;

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

[0051] 3) 0.5 g of carrier particles were added to 40 mL of deionized water, and after sufficient stirring, 0.2 g of load powder was added, and mechanical stirring was performed at 700 r / min for 10 h, and intermittent ultrasonic treatment was performed at 250 W. The ultrasonic treatment interval was 15 min, and the treatment time was 7 min. After the treatment was completed, 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 added to 80 mL of deionized water in sequence, and after being fully stirred, the mixture was transferred to a hydrothermal kettle, 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, heated from room temperature to 560° C. at a rate of 3° C. / min, and calcined for 7 h. After the calcination was completed, the mixture was cooled to room temperature, and after being fully ground, a porous nanosheet was obtained;

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

[0054] Example 3

[0055] An enhanced high-efficiency cement activation grinding aid, which is prepared 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] Weigh each raw material according to the ratio, add the flower-shaped composite nanoparticles into propylene glycol, ultrasonically disperse at 300 W for 40 min, then add ethylene glycol, rice husk ash, urea, triisopropanolamine, polyol, surfactant, water reducer and water in sequence, continue to ultrasonically disperse evenly, stir at 800 r / min for 2 h, and then stand for 16 h to obtain the required high-efficiency cement activation grinding aid.

[0058] Wherein, the preparation method of flower-shaped composite nanoparticles is as follows:

[0059] 1) 0.7 g potassium iodide was dissolved in 50 mL deionized water, and magnetically stirred for 30 min to obtain solution A; 6 mmol bismuth nitrate pentahydrate was dissolved in 50 mL deionized water, and magnetically stirred for 30 min to obtain solution B; then, under magnetic stirring, solution B was slowly dripped into an equal volume of solution A, and stirring was maintained until a brick-red solution was formed, and the solution was centrifuged, filtered, and dried to obtain carrier particles;

[0060] 2) Dissolve 0.7 g potassium hydroxide in 70 mL deionized water, stir and dissolve, then add 20 g melamine, stir thoroughly and centrifuge to dry, then put into a crucible, place 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, and after sufficient stirring, 0.2 g of load powder was added, and mechanical stirring was performed at 800 r / min for 12 h, and intermittent ultrasonic treatment was performed at 300 W. The ultrasonic treatment interval was 20 min, and the treatment time was 10 min. After the treatment was completed, 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 added to 100 mL of deionized water in sequence, and after being fully stirred, the mixture was transferred to a hydrothermal kettle, 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 mixture was cooled to room temperature, and after being fully ground, a porous nanosheet was obtained;

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

[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 flower-shaped composite nanoparticles.

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

[0068] Comparative Example 5: This comparative example is basically the same as Example 1, except that in the preparation of flower-shaped composite nanoparticles, steps 4)-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, and the amount of the grinding aid added was 0.03% of the total mass. The grinding fineness and cement performance 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] It can be seen from Table 1 that 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 only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An enhanced high-efficiency cement activation grinding aid, characterized in that: The cement activation grinding aid is made of 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 oil monoethanolamide sulfosuccinate and monolauryl phosphate; The water reducer is a polycarboxylate water reducer.

2. The enhanced high-efficiency cement activated grinding aid according to claim 1, characterized in that: The preparation method of the flower-shaped composite nanoparticles is as follows: 1) adding melamine and β-cyclodextrin to deionized water in sequence, stirring thoroughly, transferring to a hydrothermal kettle, placing in an oven, reacting at 180-190° C. for 24-30 hours, cooling to room temperature, washing the product, drying it, placing it in a muffle furnace, heating it from room temperature to 550-570° C. at a rate of 2-3° C. / min, and calcining it, cooling it to room temperature after the calcination is completed, and grinding it thoroughly to obtain a porous nanosheet; 2) The porous nanosheets and flower-shaped nanoparticles are sequentially added into a three-dimensional vibration ball mill, the vibration frequency is 1400-1800r / min, the ball-to-material mass ratio is controlled to be (10-15):1, the ball milling medium is anhydrous ethanol, the ball milling time is 20-40min, after the ball milling is completed, the product is centrifuged, filtered, and then fully washed with deionized water, and dried to obtain flower-shaped composite nanoparticles.

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

4. The enhanced high-efficiency cement activated grinding aid according to claim 2, characterized in that: In step 2), the mass ratio of the porous nanosheets to the flower-shaped nanoparticles is (80-90):(10-20).

5. The enhanced high-efficiency cement activated grinding aid according to claim 1, characterized in that: The preparation method of the flower-shaped nanoparticles is as follows: 1) Dissolve potassium iodide in deionized water, stir magnetically for 10-30 min to obtain solution A, dissolve bismuth nitrate pentahydrate in deionized water, stir magnetically for 10-30 min to obtain solution B, then slowly drip solution B into an equal volume of solution A under magnetic stirring, keep stirring until a brick red solution is formed, centrifuge, filter and dry to obtain carrier particles; 2) dissolving potassium hydroxide in deionized water, stirring and dissolving, adding melamine, stirring thoroughly, centrifuging and drying, then putting into a crucible, placing in a muffle furnace, reacting at 530-550° C. for 4-6 hours, and grinding to obtain a loaded powder; 3) Add the carrier particles into deionized water, stir thoroughly, then add the load powder, stir mechanically at 500-800 r / min for 8-12 h, and assist with intermittent ultrasonic treatment at 200-300 W, the ultrasonic treatment interval is 10-20 min, the treatment time is 5-10 min, after the treatment is completed, the product is centrifuged, filtered and dried to obtain flower-shaped nanoparticles.

6. The enhanced high-efficiency cement activated grinding aid according to claim 5, characterized in that: In step 1), in the solution A, the ratio of potassium iodide to deionized water 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.

7. The enhanced high-efficiency cement activation grinding aid according to claim 5, 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.

8. The enhanced high-efficiency cement activation grinding aid according to claim 5, characterized in that: In step 3), the usage ratio of the carrier particles, deionized water, and load powder is (0.3-0.6) g: (20-50) mL: (0.1-0.2) g.

9. The method for preparing an enhanced high-efficiency cement activation grinding aid according to any one of claims 1 to 8, characterized in that: The specific steps include: Weigh the raw materials according to the ratio, add the flower-shaped composite nanoparticles into propylene glycol, and disperse them evenly by ultrasonication. Then, add ethylene glycol, rice husk ash, urea, triisopropanolamine, polyol, surfactant, water reducer and water in sequence, continue to disperse them evenly by ultrasonication, and then stir and stand for treatment to obtain the desired high-efficiency cement activation grinding aid.

10. The method for preparing an enhanced high-efficiency cement activated grinding aid according to claim 9, characterized in that: The ultrasonic dispersion power is 200-300W, and the dispersion time is 20-40min; The stirring speed is 500-800r / min, and the stirring time is 1-2h; The standing time is 10-16h.

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