Efficient composite type portland cement clinker grinding aid and application thereof

Abstract

The application relates to the technical field of cement grinding aids, and particularly discloses a high-efficiency composite Portland cement clinker grinding aid and application thereof. The grinding aid comprises separated A liquid and B liquid. The A liquid comprises a mixed solution of ethylene glycol and water and dihydrogen iron phosphate, wherein the volume ratio of the ethylene glycol to the water is 3-3.7:1, and the dihydrogen iron phosphate in the mixed solution is in a saturated state. The B liquid comprises a sodium borohydride and / or potassium borohydride solution, a polycarboxylic acid water reducing agent and modified magnesium oxide powder. The mass fraction of the sodium borohydride and / or potassium borohydride solution is 3-5%, the mass fraction of the polycarboxylic acid water reducing agent in the B liquid is 12-17%, and the content of the modified magnesium oxide powder is 4.5-7 g / L. The above grinding aid can effectively eliminate the electrostatic effect of cement particles, reduce the re-agglomeration between the particles, improve the dispersity of the cement clinker particles, and thus improve the grinding efficiency.

Description

Technical Field

[0001] This invention relates to the field of cement grinding aid technology, specifically to a high-efficiency composite silicate cement clinker grinding aid and its application. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Grinding cement clinker is a crucial step in cement production. After high-temperature calcination and cooling, cement clinker forms lumps that need to be ground into powder. Grinded cement clinker particles have a larger specific surface area, resulting in higher hydration reactivity and contributing to improved density and mechanical strength of the prepared concrete structures.

[0004] Cement grinding is typically accomplished using a grinding mill, with grinding aids added to improve efficiency. These aids reduce the adhesion between cement particles and improve flowability, thus helping to shorten grinding time and reduce power consumption. However, during the grinding process, cement particles become charged through continuous friction and are prone to re-agglomeration. This leads to reduced grinding efficiency, decreased production capacity, and increased power consumption, which is detrimental to energy conservation and emission reduction efforts. Summary of the Invention

[0005] This invention provides a high-efficiency composite silicate cement clinker grinding aid and its application. This grinding aid can effectively eliminate the electrostatic effect of cement particles, reduce the re-agglomeration between particles, and improve the dispersion of cement clinker particles, thereby improving grinding efficiency. Specifically, the technical solution of this invention is as follows.

[0006] First, this invention discloses a high-efficiency composite silicate cement clinker grinding aid, comprising separate liquid A and liquid B. Liquid A comprises a mixture of ethylene glycol and water, and ferric dihydrogen phosphate. The volume ratio of ethylene glycol to water is 3-3.7:1, and the ferric dihydrogen phosphate in the mixture is saturated. Liquid B comprises sodium borohydride and / or potassium borohydride solution, polycarboxylate superplasticizer, and modified magnesium oxide powder. The mass fraction of the sodium borohydride and / or potassium borohydride solution is 3-5%, the mass fraction of the polycarboxylate superplasticizer in Liquid B is 12-17%, and the content of the modified magnesium oxide powder is 4.5-7 g / L.

[0007] Furthermore, the mass ratio of liquid A to liquid B is 1:0.4~0.52.

[0008] Furthermore, the modified magnesium oxide powder is prepared by the following method: magnesium oxide powder is dispersed in ethanol, then a silane coupling agent is added, the mixture is stirred evenly and then evaporated to dryness, the resulting solid product is calcined, and the modified magnesium oxide powder is obtained after cooling to room temperature.

[0009] Further, the ratio of magnesium oxide powder to ethanol is 1g:10~30ml. Optionally, the fineness of the magnesium oxide powder is 100~200 mesh.

[0010] Further, the mass fraction of the silane coupling agent in the ethanol is 1-2%. Optionally, the mass fraction of the ethanol is not less than 80%.

[0011] Furthermore, the silane coupling agent includes at least one of KH550, KH560, KH570, KH792, etc.

[0012] Furthermore, the evaporation treatment is carried out at a temperature of 90~110°C, and the product is evaporated at this temperature until the weight of the solid product no longer changes.

[0013] Furthermore, the calcination treatment is carried out at a temperature of 400-500℃ for 30-40 minutes. During this process, the silane coupling agent grafted onto the surface of the magnesium oxide particles decomposes at high temperature to form nano-silica. This not only helps to increase the steric hindrance of the magnesium oxide particles, thereby reducing agglomeration and improving dispersion, but the nano-silica can also participate in the hydration reaction of cement, forming hydrated calcium silicate cementitious components with the hydration product calcium hydroxide, which helps to increase the mechanical strength of cement-based materials.

[0014] Secondly, this invention discloses the application of the high-efficiency composite silicate cement clinker grinding aid in cement grinding. The method of application is as follows: first, the A liquid is sprayed into the cement clinker after primary grinding and mixed evenly; then, the B liquid is stirred and sprayed into the cement clinker, mixed evenly, and then ground.

[0015] Furthermore, the grinding aid is added at a rate of 0.10 to 0.25% of the cement clinker mass.

[0016] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects:

[0017] The cement clinker grinding aid of this invention comprises a mixture of ethylene glycol and water, forming liquid A with ferric dihydrogen phosphate, and liquid B with sodium borohydride and / or potassium borohydride solution, polycarboxylate superplasticizer, and modified magnesium oxide powder. When using this grinding aid for grinding cement clinker, the ethylene glycol effectively reduces the friction between cement clinker particles, improving particle flowability. The magnesium oxide helps increase the grinding effect on cement particles, thereby improving grinding efficiency and reducing energy consumption. After the ferric dihydrogen phosphate and sodium borohydride and / or potassium borohydride, which have penetrated into the cement clinker, react, iron ions are reduced to elemental iron particles embedded in the clinker particles. During grinding, these elemental iron particles absorb frictional heat and expand in volume, helping to create microcracks in the clinker particles, accelerating particle breakage, and thus improving grinding efficiency. Simultaneously, the elemental iron particles in the clinker particles also help eliminate the charge generated during grinding, reducing the agglomeration of clinker particles due to electrostatic adsorption, improving particle dispersion, and further enhancing grinding efficiency. Simultaneously, under the grinding action, after cement particles are broken, a large number of calcium ion active sites are formed on the surface after the Ca-O bonds are broken. These active sites cause cement particles to tend to recombine and restore Ca-O, thereby reducing the grinding effect. The polycarboxylate superplasticizer can utilize its abundant carboxyl, hydroxyl, and sulfonic acid groups to form stable complexes with the calcium ions at the active sites, thereby reducing the number of calcium ion active sites, reducing the phenomenon of cement particles re-agglomerating, and improving grinding efficiency. In addition, the reaction of ferric phosphate and sodium borohydride and / or potassium borohydride will also form sodium dihydrogen phosphate and potassium dihydrogen phosphate. When cement clinker containing this substance and the magnesium oxide particles is used to prepare cement-based materials, the sodium dihydrogen phosphate, potassium dihydrogen phosphate and magnesium oxide can undergo a hydration reaction to form a high-strength hydration product, struvite. The mechanical strength of this product is much higher than that of the hydration products of silicate cement clinker, thereby helping to increase the mechanical strength of cement-based materials prepared from silicate cement clinker. Simultaneously, the reaction of the elemental iron particles with hydroxide ions released during cement hydration to form iron colloids helps increase the density of cement-based materials, further enhancing their mechanical strength. The water-reducing agent adhering to the cement particles also helps improve the fluidity of the prepared cement-based materials, thus improving their workability. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0019] Figure 1 The image shows a sample of modified magnesium oxide powder prepared in Example 1 below.

[0020] Figure 2 The image shows a sample of grinding aid liquid A prepared in Example 1 below. Detailed Implementation

[0021] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer.

[0022] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as those skilled in the art. All reagents and raw materials used in this invention are readily available through conventional means, and unless otherwise specified, they shall be used in accordance with conventional methods in the art or as per the product instructions.

[0023] Furthermore, any methods and materials similar to or equivalent to those described herein can be applied to the method of this invention. The preferred embodiments and materials described in this invention are for illustrative purposes only. The technical solution of this invention will now be further described in conjunction with specific embodiments.

[0024] Example 1

[0025] The preparation of a high-efficiency composite silicate cement clinker grinding aid includes the following steps:

[0026] (1) Magnesium oxide powder with a fineness of 200 mesh was added to 90% ethanol at a ratio of 1g:15ml and stirred until homogeneous. Then, silane coupling agent (KH550) was added and stirred until homogeneous to obtain a mixture with a silane coupling agent mass fraction of 1.0%. The mixture was heated to 90℃ and evaporated until the weight of the obtained solid product no longer changed. Then, the solid product was heated to 400℃ and calcined for 40min. After cooling to room temperature, modified magnesium oxide powder (e.g., Figure 1 (As shown), for later use.

[0027] (2) Mix ethylene glycol and water at a volume ratio of 3.5:1 and stir until homogeneous. Then, add ferric dihydrogen phosphate until saturated under stirring to obtain solution A (e.g. Figure 2 (As shown), for later use.

[0028] (3) Add polycarboxylate superplasticizer to a sodium borohydride aqueous solution with a mass fraction of 5% to obtain a mixture with a superplasticizer mass fraction of 14%. Then add the modified magnesium oxide powder prepared in this embodiment and stir evenly to obtain solution B with a modified magnesium oxide powder content of 6 g / L.

[0029] (4) The A liquid and B liquid are mixed in a mass ratio of 1:0.45 to form a silicate cement clinker grinding aid. Before use, the A liquid and B liquid are stored separately.

[0030] When using, the grinding aid is added at a ratio of 0.15% of the cement clinker mass. First, under stirring conditions, the A liquid is sprayed into 42.5 ordinary Portland cement clinker that has been initially ground to a particle size distribution between 0.5 and 2 mm and stirred evenly. Then, the B liquid is stirred and sprayed into the cement clinker under stirring conditions. After stirring evenly, the cement clinker is ground using a ball mill for 30 minutes. After completion, it is cooled to room temperature to obtain cement clinker powder.

[0031] Performance testing: (1) The cement clinker powder obtained in this embodiment was mixed with water-cement ratio of 0.41 and poured into a mold. After hardening and demolding, it was placed in a curing box for 28 days. Then, the compressive strength of the specimen was tested according to the "Test Method for Strength of Cement Mortar (ISO Method)" (GBT 17671-2021). (2) The fluidity of the cement paste formed by the cement clinker powder in this embodiment was tested according to the "Test Method for Flowability of Cement Mortar" (GBT2419-2005). (3) The specific surface area of ​​the cement clinker powder in this embodiment was tested according to GB / T26748-2011 "Cement Grinding Aids". The larger the value, the better the grinding aid effect. The results are shown in the table below:

[0032] .

[0033] Example 2

[0034] The preparation of a high-efficiency composite silicate cement clinker grinding aid includes the following steps:

[0035] (1) Add 200-mesh magnesium oxide powder to 80% ethanol at a ratio of 1g:10ml and stir until homogeneous. Then add silane coupling agent (KH560) and stir until homogeneous to obtain a mixture with a silane coupling agent mass fraction of 1.5%. Heat the mixture to 110℃ and evaporate it until the weight of the obtained solid product no longer changes. Then heat the solid product to 450℃ and calcine it for 30min. After cooling to room temperature, obtain modified magnesium oxide powder for later use.

[0036] (2) Mix ethylene glycol and water at a volume ratio of 3.7:1 and stir until homogeneous. Then, add ferric dihydrogen phosphate to saturation under stirring to obtain solution A, which is ready for use.

[0037] (3) Add polycarboxylate superplasticizer to a sodium borohydride aqueous solution with a mass fraction of 3% to obtain a mixture with a superplasticizer mass fraction of 12%. Then add the modified magnesium oxide powder prepared in this embodiment and stir evenly to obtain solution B with a modified magnesium oxide powder content of 7 g / L.

[0038] (4) The A liquid and B liquid are mixed in a mass ratio of 1:0.52 to form a silicate cement clinker grinding aid. Before use, the A liquid and B liquid are stored separately.

[0039] When using, the grinding aid is added at a ratio of 0.1% of the cement clinker mass. First, under stirring conditions, the A liquid is sprayed into 42.5 ordinary Portland cement clinker that has been initially ground to a particle size distribution between 0.5 and 2 mm and stirred evenly. Then, the B liquid is stirred and sprayed into the cement clinker under stirring conditions. After stirring evenly, the cement clinker is ground using a ball mill for 30 minutes. After completion, it is cooled to room temperature to obtain cement clinker powder.

[0040] Performance testing: The various performance indicators of the cement clinker powder prepared in this embodiment were tested using the same method as in Example 1 above. The results are shown in the table below:

[0041] .

[0042] Example 3

[0043] The preparation of a high-efficiency composite silicate cement clinker grinding aid includes the following steps:

[0044] (1) Add 100-mesh magnesium oxide powder to 95% ethanol at a ratio of 1g:30ml and stir until homogeneous. Then add silane coupling agent (KH570) and stir until homogeneous to obtain a mixture with a silane coupling agent mass fraction of 2%. Heat the mixture to 105℃ and evaporate it until the weight of the obtained solid product no longer changes. Then heat the solid product to 500℃ and calcine it for 40min. After cooling to room temperature, obtain modified magnesium oxide powder for later use.

[0045] (2) Mix ethylene glycol and water at a volume ratio of 3:1 and stir until homogeneous. Then, add ferric dihydrogen phosphate to saturation under stirring to obtain solution A, which is ready for use.

[0046] (3) Add polycarboxylate superplasticizer to a 4% potassium borohydride aqueous solution to obtain a mixture with a superplasticizer mass fraction of 17%. Then add the modified magnesium oxide powder prepared in this embodiment and stir evenly to obtain solution B with a modified magnesium oxide powder content of 4.5 g / L.

[0047] (4) The A liquid and B liquid are mixed in a mass ratio of 1:0.4 to form a silicate cement clinker grinding aid. Before use, the A liquid and B liquid are stored separately.

[0048] When using, the grinding aid is added at a ratio of 0.25% of the cement clinker mass. First, under stirring conditions, the A liquid is sprayed into 42.5 ordinary Portland cement clinker that has been initially ground to a particle size distribution between 0.5 and 2 mm and stirred evenly. Then, the B liquid is stirred and sprayed into the cement clinker under stirring conditions. After stirring evenly, the cement clinker is ground using a ball mill for 30 minutes. After completion, it is cooled to room temperature to obtain cement clinker powder.

[0049] Performance testing: The various performance indicators of the cement clinker powder prepared in this embodiment were tested using the same method as in Example 1 above. The results are shown in the table below:

[0050] .

[0051] Example 4

[0052] The preparation of a high-efficiency composite silicate cement clinker grinding aid includes the following steps:

[0053] (1) Add 200-mesh magnesium oxide powder to 90% ethanol at a ratio of 1g:15ml and stir until homogeneous. Then add silane coupling agent (KH550) and stir until homogeneous to obtain a mixture with a silane coupling agent mass fraction of 1%. Heat the mixture to 90℃ and evaporate it until the weight of the obtained solid product no longer changes. Then heat the solid product to 400℃ and calcine it for 40 minutes. After cooling to room temperature, obtain modified magnesium oxide powder for later use.

[0054] (2) Mix ethylene glycol and water at a volume ratio of 3.5:1 and stir until homogeneous to obtain solution A, which is then set aside.

[0055] (3) Add polycarboxylate superplasticizer to a sodium borohydride aqueous solution with a mass fraction of 5% to obtain a mixture with a superplasticizer mass fraction of 14%. Then add the modified magnesium oxide powder prepared in this embodiment and stir evenly to obtain solution B with a modified magnesium oxide powder content of 6 g / L.

[0056] (4) The A liquid and B liquid are mixed in a mass ratio of 1:0.45 to form a silicate cement clinker grinding aid. Before use, the A liquid and B liquid are stored separately.

[0057] When using, the grinding aid is added at a ratio of 0.15% of the cement clinker mass. First, under stirring conditions, the A liquid is sprayed into 42.5 ordinary Portland cement clinker that has been initially ground to a particle size distribution between 0.5 and 2 mm and stirred evenly. Then, the B liquid is stirred and sprayed into the cement clinker under stirring conditions. After stirring evenly, the cement clinker is ground using a ball mill for 30 minutes. After completion, it is cooled to room temperature to obtain cement clinker powder.

[0058] Performance testing: The various performance indicators of the cement clinker powder prepared in this embodiment were tested using the same method as in Example 1 above. The results are shown in the table below:

[0059] .

[0060] Example 5

[0061] The preparation of a high-efficiency composite silicate cement clinker grinding aid includes the following steps:

[0062] (1) Add 200-mesh magnesium oxide powder to 80% ethanol at a ratio of 1g:10ml and stir until homogeneous. Then add silane coupling agent (KH560) and stir until homogeneous to obtain a mixture with a silane coupling agent mass fraction of 1.5%. Heat the mixture to 110℃ and evaporate it until the weight of the obtained solid product no longer changes. Then heat the solid product to 450℃ and calcine it for 30min. After cooling to room temperature, obtain modified magnesium oxide powder for later use.

[0063] (2) Mix ethylene glycol and water at a volume ratio of 3.7:1 and stir until homogeneous. Then, add ferric dihydrogen phosphate to saturation under stirring to obtain solution A, which is ready for use.

[0064] (3) Add polycarboxylate superplasticizer to water to obtain a mixture with a superplasticizer mass fraction of 12%, then add the modified magnesium oxide powder prepared in this embodiment and stir evenly to obtain solution B with a modified magnesium oxide powder content of 7 g / L.

[0065] (4) The A liquid and B liquid are mixed in a mass ratio of 1:0.52 to form a silicate cement clinker grinding aid. Before use, the A liquid and B liquid are stored separately.

[0066] When using, the grinding aid is added at a ratio of 0.1% of the cement clinker mass. First, under stirring conditions, the A liquid is sprayed into 42.5 ordinary Portland cement clinker that has been initially ground to a particle size distribution between 0.5 and 2 mm and stirred evenly. Then, the B liquid is stirred and sprayed into the cement clinker under stirring conditions. After stirring evenly, the cement clinker is ground using a ball mill for 30 minutes. After completion, it is cooled to room temperature to obtain cement clinker powder.

[0067] Performance testing: The various performance indicators of the cement clinker powder prepared in this embodiment were tested using the same method as in Example 1 above. The results are shown in the table below:

[0068] .

[0069] Example 6

[0070] The preparation of a high-efficiency composite silicate cement clinker grinding aid includes the following steps:

[0071] (1) Mix ethylene glycol and water at a volume ratio of 3.5:1 and stir until homogeneous. Then, add ferric dihydrogen phosphate to saturation under stirring to obtain solution A, which is ready for use.

[0072] (2) Add polycarboxylate superplasticizer to a sodium borohydride aqueous solution with a mass fraction of 5% to obtain a mixture with a superplasticizer mass fraction of 14%. Then add magnesium oxide powder with a fineness of 200 mesh and stir evenly to obtain solution B with a modified magnesium oxide powder content of 6 g / L.

[0073] (3) The A liquid and B liquid are mixed in a mass ratio of 1:0.45 to form a silicate cement clinker grinding aid. Before use, the A liquid and B liquid are stored separately.

[0074] When using, the grinding aid is added at a ratio of 0.15% of the cement clinker mass. First, under stirring conditions, the A liquid is sprayed into 42.5 ordinary Portland cement clinker that has been initially ground to a particle size distribution between 0.5 and 2 mm and stirred evenly. Then, the B liquid is stirred and sprayed into the cement clinker under stirring conditions. After stirring evenly, the cement clinker is ground using a ball mill for 30 minutes. After completion, it is cooled to room temperature to obtain cement clinker powder.

[0075] Performance testing: The various performance indicators of the cement clinker powder prepared in this embodiment were tested using the same method as in Example 1 above. The results are shown in the table below:

[0076] .

[0077] Example 7

[0078] The preparation of a high-efficiency composite silicate cement clinker grinding aid includes the following steps:

[0079] (1) Add 100-mesh magnesium oxide powder to 95% ethanol at a ratio of 1g:30ml and stir until homogeneous. Then add silane coupling agent (KH570) and stir until homogeneous to obtain a mixture with a silane coupling agent mass fraction of 2%. Heat the mixture to 105℃ and evaporate it until the weight of the obtained solid product no longer changes. Then heat the solid product to 500℃ and calcine it for 40min. After cooling to room temperature, obtain modified magnesium oxide powder for later use.

[0080] (2) Mix ethylene glycol and water at a volume ratio of 3:1 and stir until homogeneous. Then, add ferric dihydrogen phosphate to saturation under stirring to obtain solution A, which is ready for use.

[0081] (3) Add the modified magnesium oxide powder prepared in this embodiment to a 4% potassium borohydride aqueous solution and stir until homogeneous to obtain solution B with a modified magnesium oxide powder content of 4.5 g / L.

[0082] (4) The A liquid and B liquid are mixed in a mass ratio of 1:0.4 to form a silicate cement clinker grinding aid. Before use, the A liquid and B liquid are stored separately.

[0083] When using, the grinding aid is added at a ratio of 0.25% of the cement clinker mass. First, under stirring conditions, the A liquid is sprayed into 42.5 ordinary Portland cement clinker that has been initially ground to a particle size distribution between 0.5 and 2 mm and stirred evenly. Then, the B liquid is stirred and sprayed into the cement clinker under stirring conditions. After stirring evenly, the cement clinker is ground using a ball mill for 30 minutes. After completion, it is cooled to room temperature to obtain cement clinker powder.

[0084] Performance testing: The various performance indicators of the cement clinker powder prepared in this embodiment were tested using the same method as in Example 1 above. The results are shown in the table below:

[0085] .

[0086] Example 8

[0087] The preparation of a high-efficiency composite silicate cement clinker grinding aid includes the following steps:

[0088] (1) Mix ethylene glycol and water at a volume ratio of 3.7:1 and stir until homogeneous. Then, add ferric dihydrogen phosphate to saturation under stirring to obtain solution A, which is ready for use.

[0089] (2) Add polycarboxylate superplasticizer to a 3% sodium borohydride aqueous solution to obtain solution B with a superplasticizer mass fraction of 25%, and set aside.

[0090] (3) The A liquid and B liquid are mixed in a mass ratio of 1:0.52 to form a silicate cement clinker grinding aid. Before use, the A liquid and B liquid are stored separately.

[0091] When using, the grinding aid is added at a ratio of 0.1% of the cement clinker mass. First, under stirring conditions, the A liquid is sprayed into 42.5 ordinary Portland cement clinker that has been initially ground to a particle size distribution between 0.5 and 2 mm and stirred evenly. Then, the B liquid is stirred and sprayed into the cement clinker under stirring conditions. After stirring evenly, the cement clinker is ground using a ball mill for 30 minutes. After completion, it is cooled to room temperature to obtain cement clinker powder.

[0092] Performance testing: The various performance indicators of the cement clinker powder prepared in this embodiment were tested using the same method as in Example 1 above. The results are shown in the table below:

[0093] .

[0094] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 high-efficiency composite silicate cement clinker grinding aid, characterized in that, The grinding aid comprises separate liquid A and liquid B; wherein: liquid A comprises a mixture of ethylene glycol and water, and ferric dihydrogen phosphate; wherein the volume ratio of ethylene glycol to water is 3~3.7:1, and the ferric dihydrogen phosphate in the mixture is saturated; liquid B comprises sodium borohydride and / or potassium borohydride solution, polycarboxylate superplasticizer, and modified magnesium oxide powder; wherein: the mass fraction of sodium borohydride and / or potassium borohydride solution is 3~5%, the mass fraction of polycarboxylate superplasticizer in liquid B is 12~17%, and the content of modified magnesium oxide powder is 4.5~7 g / L.

2. The high-efficiency composite silicate cement clinker grinding aid according to claim 1, characterized in that, The mass ratio of liquid A to liquid B is 1:0.4~0.

52.

3. The high-efficiency composite silicate cement clinker grinding aid according to claim 1, characterized in that, The modified magnesium oxide powder is prepared by the following method: magnesium oxide powder is dispersed in ethanol, then a silane coupling agent is added, the mixture is stirred evenly and then evaporated to dryness, the resulting solid product is calcined, and the modified magnesium oxide powder is obtained after cooling to room temperature.

4. The high-efficiency composite silicate cement clinker grinding aid according to claim 3, characterized in that, The ratio of magnesium oxide powder to ethanol is 1g:10~30ml.

5. The high-efficiency composite silicate cement clinker grinding aid according to claim 3, characterized in that, The magnesium oxide powder has a fineness of 100-200 mesh.

6. The high-efficiency composite silicate cement clinker grinding aid according to claim 3, characterized in that, The mass fraction of silane coupling agent in the ethanol is 1-2%.

7. The high-efficiency composite silicate cement clinker grinding aid according to claim 3, characterized in that, The mass fraction of the ethanol is not less than 80%.

8. The high-efficiency composite silicate cement clinker grinding aid according to claim 3, characterized in that, The silane coupling agent includes at least one of KH550, KH560, KH570, and KH792.

9. The high-efficiency composite silicate cement clinker grinding aid according to any one of claims 3-8, characterized in that, The evaporation process is carried out at a temperature of 90~110℃, and the solid product is evaporated at this temperature until its weight no longer changes.

10. The high-efficiency composite silicate cement clinker grinding aid according to any one of claims 3-8, characterized in that, The calcination treatment is carried out at a temperature of 400~500℃ for 30~40 minutes.

11. The application of the high-efficiency composite silicate cement clinker grinding aid according to any one of claims 1-10 in cement grinding, characterized in that, The method of this application is as follows: first, spray liquid A into the cement clinker after initial grinding and mix evenly, then spray liquid B, mix evenly, and then grind.

12. The application according to claim 11, characterized in that, The grinding aid is added at a rate of 0.10 to 0.25% of the cement clinker mass.

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