Anti-skinning composite cement grinding aid as well as preparation method and application thereof

Abstract

The invention relates to the technical field of cement grinding aids, and particularly discloses an anti-skinning composite cement grinding aid as well as a preparation method and application thereof, and the anti-skinning composite cement grinding aid comprises the following components in percentage by mass: 30-60% of an organic amine mixture; the mass percent of the dispersion stabilizer is 5-30%; the mass percent of the auxiliary functional agent is 5-15%; and the balance of water. The composite cement grinding aid capable of effectively preventing the powder concentrator from skinning and improving the grinding efficiency and the cement strength is environment-friendly and easy to prepare, the cost of raw materials of a product can be greatly reduced, the grinding aiding effect is greatly improved, the skinning rate of the powder concentrator is greatly reduced, the effect is 65% or above, the compressive strength of cement at all ages can be obviously improved, and the cement quality is improved. The 3-day strength of the cement is increased by 4-5 MPa, and the 28-day strength of the cement is increased by 6-8 MPa.

Description

Technical Field

[0001] The present invention belongs to the technical field of cement grinding aids, and particularly relates to an anti-caking composite cement grinding aid, a preparation method thereof, and an application thereof. Background Art

[0002] A cement grinding aid is a chemical additive that improves the grinding effect and performance of cement, can significantly increase the hourly output of cement and the strength of cement at each age, and improve its fluidity. During the grinding process of cement clinker, adding a small amount of cement grinding aid can significantly improve the grinding efficiency or reduce energy consumption without damaging the performance of cement. In the prior art, traditional grinding aids (such as triethanolamine single system) are prone to volatilize and deposit at the wind deflector blades of the O-Sepa separator, forming caking (thickness > 1.2 mm), resulting in an increase in ventilation resistance, an increase in the amount of system return ash, and an increase in the power consumption of cement production, leading to an increase in energy consumption and equipment maintenance costs.

[0003] In the Chinese patent with the publication number CN115893907A, a composite cement grinding aid and a preparation method thereof are mentioned. The composite cement grinding aid contains the following raw materials in mass percentage: 5% - 8% of diethanol monoisopropanolamine, 10% - 15% of polyhydric alcohol, 4% - 8% of sodium thiocyanate, 2% - 4% of glycerol, 1% - 3% of a retarder, and the balance of water. The polyhydric alcohol is one or more of dipropylene glycol, tripropylene glycol, and polyethylene glycol. The retarder is composed of sodium dioctyl sulfosuccinate, sodium lignosulfonate, and granulated sugar. Although the above scheme has many beneficial effects, the problem of solving caking at the O-Sepa separator and reducing the amount of system return ash is not mentioned in the composite cement grinding aid of this scheme, and it is not suitable for popularization and application.

[0004] In view of this, the inventor proposes an anti-caking composite cement grinding aid, a preparation method thereof, and an application thereof to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an anti-caking composite cement grinding aid, a preparation method thereof, and an application thereof to solve the problems mentioned in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] An anti-caking composite cement grinding aid, the grinding aid includes by mass fraction ratio:

[0008] 30% - 60% of an organic amine mixture;

[0009] 5% - 30% of a dispersion stabilizer;

[0010] 5% - 15% of an auxiliary functional agent;

[0011] The balance is water.

[0012] Preferably, the organic amine mixture is compounded from triisopropanolamine, diethanol monoisopropanolamine, and triethanolamine in a ratio of 1-2:2.5-4:1.

[0013] Preferably, the dispersion stabilizer includes at least one of lignosulfonate, sodium polyacrylate, fatty alcohol polyoxyethylene ether, and sodium hexametaphosphate.

[0014] Preferably, the auxiliary functional agent includes at least one of sodium acetate, silicone defoamer, industrial by-product molasses, and industrial by-product sodium chloride.

[0015] Preferably, the water is deionized water or ultrapure water.

[0016] According to the preparation method of an anti-caking composite cement grinding aid described above, it includes the following steps:

[0017] S1: Add water to the reaction kettle by mass percentage, turn on the heating power supply, control the temperature between 35°C and 40°C, and then sequentially add triisopropanolamine, diethanol monoisopropanolamine, and triethanolamine by mass percentage and keep stirring for 20 minutes to obtain an organic amine mixture.

[0018] S2: Continue heating, control the temperature between 45°C and 50°C, then sequentially disperse the dispersion stabilizer and the auxiliary functional agent by mass percentage, keep stirring for 60 minutes, then cut off the heating power supply. When the temperature drops to room temperature, add the silicone defoamer by mass percentage, and then perform homogenizing stirring for 30 minutes to obtain an anti-caking composite cement grinding aid.

[0019] An anti-caking composite cement grinding aid is applied in the production of cement products by cement grinding. The cement product obtained by cement grinding is produced by adding the cement grinding aid prepared according to the preparation method of claim 6 at a mass percentage of 0.02% to 0.05% to the cement mill roller press or the head of the cement mill.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] (1) In the present invention, the low-temperature volatilization inhibition characteristics are reduced by compounding triisopropanolamine, diethanol monoisopropanolamine, and triethanolamine, and the deposition and caking of amines in the separator are reduced (tests show that the caking thickness is reduced by more than 65%); a steric hindrance effect is formed between lignosulfonate and sodium polyacrylate, and together with fatty alcohol polyoxyethylene ether, the agglomeration of fine powder is reduced, and the amount of returned ash is decreased by about 28%; sodium acetate acts as a pH buffer and synergistically with the silicone defoamer to maintain the stability of the system and can increase the output.

[0022] (2) The cement grinding aid prepared by the present invention can significantly increase the 3-day strength of cement by 4-5 MPa and the 28-day strength of cement by 6-8 MPa. The combined formula of the composite cement grinding aid of the present invention does not contain any harmful components and meets the environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the blade scaling of the O-Sepa separator for preparing the blank sample cement of the present invention;

[0024] Figure 2 It is a schematic diagram of the blade scaling of the O-Sepa separator for preparing the cement of Comparative Example 1 of the present invention;

[0025] Figure 3 It is a schematic diagram of the blade scaling of the O-Sepa separator for preparing the cement of Example 3 of the present invention;

[0026] Figure 4 It is a flow chart of the preparation method of an anti-scaling composite cement grinding aid of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0028] Example 1:

[0029] Please refer to Figures 1 to 4 As shown, an anti-scaling composite cement grinding aid, the grinding aid contains the following raw materials in mass percentages: triisopropanolamine 10%, diethanolmonoisopropanolamine 50%, triethanolamine 5%, industrial by-product molasses 5%, industrial by-product sodium chloride 2%, sodium hexametaphosphate 3%, and the balance is deionized water.

[0030] The preparation method of the anti-scaling composite cement grinding aid specifically includes the following steps:

[0031] Add deionized water to the reaction kettle according to the mass percentage, turn on the heating power supply, control the temperature between 35°C and 40°C, and then add triisopropanolamine, diethanolmonoisopropanolamine, and triethanolamine in sequence according to the mass percentage and keep stirring for 20 min to obtain an organic amine mixture; continue heating, control the temperature between 45°C and 50°C, and then disperse the stabilizer and auxiliary functional agent in sequence according to the mass percentage, keep stirring for 60 min, and then cut off the heating power supply. When the temperature drops to room temperature, the anti-scaling composite cement grinding aid can be obtained.

[0032] Example 2

[0033] An anti-caking composite cement grinding aid, the grinding aid comprising raw materials in the following mass percentages: triisopropanolamine 10%, diethanolmonoisopropanolamine 40%, triethanolamine 10%, industrial by-product molasses 5%, sodium hexametaphosphate 3%, and the balance being deionized water.

[0034] The preparation method of the anti-caking composite cement grinding aid specifically comprises the following steps:

[0035] Add deionized water into the reaction kettle according to the mass percentage, turn on the heating power supply, control the temperature between 35°C and 40°C, and then sequentially add triisopropanolamine, diethanolmonoisopropanolamine, and triethanolamine according to the mass percentage, and keep stirring for 20 min to obtain an organic amine mixture; continue heating, control the temperature between 45°C and 50°C, then sequentially disperse the stabilizer and the auxiliary functional agent according to the mass percentage, keep stirring for 60 min, then cut off the heating power supply, and when the temperature drops to room temperature, the anti-caking composite cement grinding aid can be obtained.

[0036] Example 3

[0037] An anti-caking composite cement grinding aid, the grinding aid comprising raw materials in the following mass percentages: triisopropanolamine 10%, diethanolmonoisopropanolamine 30%, triethanolamine 5%, sodium lignosulfonate 5%, sodium polyacrylate 2%, fatty alcohol polyoxyethylene ether 2%, sodium acetate 6%, organosilicon defoamer 2%, and the balance being deionized water.

[0038] The preparation method of the anti-caking composite cement grinding aid specifically comprises the following steps:

[0039] Add deionized water into the reaction kettle according to the mass percentage, turn on the heating power supply, control the temperature between 35°C and 40°C, and then sequentially add triisopropanolamine, diethanolmonoisopropanolamine, and triethanolamine according to the mass percentage, and keep stirring for 20 min to obtain an organic amine mixture; continue heating, control the temperature between 45°C and 50°C, then sequentially disperse the stabilizer and the auxiliary functional agent according to the mass percentage, keep stirring for 60 min, then cut off the heating power supply, and when the temperature drops to room temperature, add the organosilicon defoamer according to the mass percentage, and then carry out homogeneous stirring for 30 min to obtain the anti-caking composite cement grinding aid.

[0040] Comparative Example 1

[0041] An anti-caking composite cement grinding aid, the grinding aid comprising raw materials in the following mass percentages: diethanolmonoisopropanolamine 38%, triethanolamine 10%, dispersant 9%, organosilicon defoamer 3%, and the balance being deionized water.

[0042] The preparation method of the anti-caking composite cement grinding aid specifically includes the following steps:

[0043] Add deionized water into the reaction kettle according to the mass percentage, turn on the heating power supply, control the temperature between 35°C and 40°C, and then add diethanol monoisopropanolamine and triethanolamine in sequence according to the mass percentage, and keep stirring for 20 minutes to obtain an organic amine mixture; continue heating, control the temperature between 45°C and 50°C, then disperse the stabilizer in sequence according to the mass percentage, keep stirring for 60 minutes, then cut off the heating power supply, when the temperature drops to room temperature, add an organosilicon defoaming agent according to the mass percentage, and then carry out homogenizing stirring for 30 minutes to obtain the anti-caking composite cement grinding aid.

[0044] Comparative Example 2

[0045] An anti-caking composite cement grinding aid, the grinding aid contains the following raw materials in mass percentages: triisopropanolamine 30%, diethanol monoisopropanolamine 10%, triethanolamine 5%, dispersant 10%, organosilicon defoaming agent 3%, and the balance is deionized water.

[0046] The preparation method of the anti-caking composite cement grinding aid specifically includes the following steps:

[0047] Add deionized water into the reaction kettle according to the mass percentage, turn on the heating power supply, control the temperature between 35°C and 40°C, and then add triisopropanolamine, diethanol monoisopropanolamine and triethanolamine in sequence according to the mass percentage, and keep stirring for 20 minutes to obtain an organic amine mixture; continue heating, control the temperature between 45°C and 50°C, then disperse the stabilizer in sequence according to the mass percentage, keep stirring for 60 minutes, then cut off the heating power supply, when the temperature drops to room temperature, add an organosilicon defoaming agent according to the mass percentage, and then carry out homogenizing stirring for 30 minutes to obtain the anti-caking composite cement grinding aid.

[0048] Verification of the effect of cement grinding aid

[0049] The cement grinding aids prepared in Example 1, Example 2 and Example 3 of the present invention and Comparative Example 2 were respectively incorporated during the cement raw material grinding process (the incorporation amount of the grinding aid was 0.03%). Among them, the cement grinding was carried out using a two-compartment (the grinding compartment was ceramic balls) closed-circuit tube mill, and the grinding effect of the grinding aid was tested respectively, and the corresponding cement strength was tested according to the method described in GB175-2023. Among them, the case without adding a cement grinding aid was used as the blank control group. The test results are shown in Table 1. Among them, the cement used was P·O 42.5 cement.

[0050] Table 1

[0051]

[0052] As can be seen from the test results of the cement grinding aid in Table 1, the anti-caking composite cement grinding aid of the present invention can significantly reduce the caking rate of the O-Sepa separator blades by more than 65%, showing good grinding and anti-caking effects. At the same time, the cement grinding aid can significantly improve the 3-day strength (4 - 5 MPa) and 28-day strength (6 - 8 MPa) of the cement.

[0053] The present invention obtains a high-strength, enhanced, and anti-caking cement grinding aid, achieving good grinding and anti-caking effects under the condition of adding a small amount of cement grinding aid, and at the same time enhancing the strength of the cement.

[0054] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0055] In the attached drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved, and other structures can refer to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0056] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-caking composite cement grinding aid, characterized in that, The grinding aid comprises, by mass fraction ratio: 30% - 60% of organic amine mixture; 5% - 30% of dispersion stabilizer; 5% - 15% of auxiliary functional agent; The balance is water.

2. The anti-crusting composite cement grinding aid according to claim 1, wherein The organic amine mixture is compounded from triisopropanolamine, diethanol monoisopropanolamine, and triethanolamine in a ratio of 1 - 2:2.5 - 4:

1.

3. The anti-crusting composite cement grinding aid according to claim 1, characterized in that, The dispersion stabilizer includes at least one of lignosulfonate, sodium polyacrylate, fatty alcohol polyoxyethylene ether, and sodium hexametaphosphate.

4. An anti-crusting composite cement grinding aid according to claim 1, characterized in that The auxiliary functional agent includes at least one of sodium acetate, silicone defoamer, industrial by - product molasses, and industrial by - product sodium chloride.

5. The anti-crusting composite cement grinding aid according to claim 1, characterized in that, The water is deionized water or ultrapure water.

6. The preparation method of an anti-crusting composite cement grinding aid according to any one of claims 1-5, characterized in that, It includes the following steps: S1: Add water into the reaction kettle by mass percentage, turn on the heating power supply, control the temperature between 35°C and 40°C, and then add triisopropanolamine, diethanol monoisopropanolamine, and triethanolamine in sequence by mass percentage and keep stirring for 20 min to obtain the organic amine mixture; S2: Continue heating, control the temperature between 45°C and 50°C, then add the dispersion stabilizer and the auxiliary functional agent respectively in sequence by mass percentage, keep stirring for 60 min, then cut off the heating power supply. When the temperature drops to room temperature, add the silicone defoamer by mass percentage, and then carry out homogenizing stirring for 30 min to obtain the anti - caking composite cement grinding aid.

7. Application of an anti-caking composite cement grinding aid in the production of cement products by cement grinding, characterized in that, The cement product is produced by adding the cement grinding aid prepared by the preparation method as claimed in claim 6 to the cement mill roller press or the mill head of the cement mill in an amount of 0.02% - 0.05% by mass.

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