Low-grade cement raw material grinding aid, preparation method and application

Abstract

A low-grade cement raw material grinding aid, a preparation method and application, which are composed of triethanolamine, triisopropanolamine, sodium silicate, acetone, polyacrylic acid sodium, potassium xanthate and deionized water. The distribution of CaO and SiO2 in the raw material can be effectively improved. After the configured raw material is calcined, the free CaO content in the clinker is reduced, and the compressive strength of the cement is improved. By improving the burnability of the raw material and the strength of the clinker cement, a thought is provided for further improving the utilization rate of low-quality raw material as cement raw material, improving the performance of cement, and expanding the production of cement varieties. When the application is used in a ball mill, the hardness of difficult-to-grind materials in the raw material can be reduced, the adhesion caused by the aggregation of fine particles can be improved, and the dispersion effect between particles can be improved, thereby effectively improving the grinding effect of the raw material.

Description

Technical Field

[0001] This invention belongs to the field of inorganic non-metallic materials technology, and relates to a low-grade cement raw material grinding aid, its preparation method, and its application. Background Technology

[0002] Limestone is a chemical and biological sedimentary rock composed of calcium carbonate, with calcite as its main mineral phase. It is a primary raw material for cement production. my country has considerable limestone reserves, but their distribution is uneven, and there are significant quality differences between limestone from different regions. High-quality limestone suitable for cement clinker production accounts for only 1 / 4 to 1 / 3 of the reserves. Therefore, actively developing and utilizing low-grade limestone is a major way to meet the ever-increasing demand for cement products in my country.

[0003] Low-grade limestone refers to limestone whose chemical composition, impurity content, and physical properties do not meet the requirements for cement production. Specifically, low-grade limestone is a mineral formed when SiO2 in limestone and surrounding rocks undergoes substitution with calcite, resulting in the enrichment and separate crystallization of SiO2 to form a high-content quartz phase. Low-grade limestone typically has poor grindability, leading to high grinding energy consumption and lower quality cement products when used as a cement raw material.

[0004] Currently, the main way to produce cement using low-grade limestone as a raw material is by adjusting the ratio with other raw materials. This has led to problems such as difficulty in cement raw material batching, and the types of cement that can be produced are limited. The utilization rate of low-grade limestone is still low. Summary of the Invention

[0005] In view of the defects and deficiencies in the existing technology, the purpose of this invention is to provide a low-grade cement raw meal grinding aid that, while solving the problem of raw material grindability, improves the particle size distribution, grindability, calcinability and clinker performance of low-grade limestone raw meal. This provides a solution for improving the utilization rate of low-grade inorganic raw meal as cement raw material, enhancing cement performance, and expanding the production of various cement varieties.

[0006] To achieve the above-mentioned technical effects, the technical solution adopted by the present invention is as follows:

[0007] A low-grade cement raw material grinding aid is composed of triethanolamine, triisopropanolamine, sodium silicate, acetone, sodium polyacrylate, potassium xanthate, and deionized water.

[0008] Preferably, by weight, it comprises: 5-25 parts triethanolamine, 10-30 parts triisopropanolamine, 5-15 parts sodium silicate, 5-10 parts acetone, 5-15 parts sodium polyacrylate, 5-10 parts potassium xanthate, and 40-50 parts deionized water.

[0009] Preferred ingredients include: 20g triethanolamine, 5g triisopropanolamine, 5g sodium silicate, 5g acetone, 10g sodium polyacrylate, 15g potassium xanthate, and 40g deionized water.

[0010] Preferred ingredients include: 10g triethanolamine, 10g triisopropanolamine, 5g sodium silicate, 5g acetone, 15g sodium polyacrylate, 20g potassium xanthate, and 45g deionized water.

[0011] Preferably, the composition includes: 10g of triethanolamine, 10g of triisopropanolamine, 5g of sodium silicate, 10g of acetone, 10g of sodium polyacrylate, 5g of potassium xanthate, and 50g of deionized water.

[0012] A method for preparing a low-grade cement raw meal grinding aid disclosed in this application includes the following steps: triisopropanolamine, triethanolamine and deionized water are mixed in proportion, acetone is added and stirred evenly, and then sodium polyacrylate, potassium xanthate and sodium silicate are added in sequence and stirred evenly to obtain the low-grade cement raw meal grinding aid.

[0013] Preferably, triisopropanolamine, triethanolamine and deionized water are mixed in a certain proportion and magnetically stirred for 30 minutes.

[0014] The low-grade cement raw meal grinding aid disclosed in this application or the low-grade cement raw meal grinding aid prepared by the method disclosed in this application is used in ball mills.

[0015] The above technical solution has the following beneficial effects: This invention provides a low-grade cement raw meal grinding aid that effectively improves the distribution of CaO and SiO2 in the raw meal. After calcination, the free CaO content in the clinker decreases, and the compressive strength of the cement increases. By improving the burnability of the raw meal and the strength of the clinker cement, this invention provides a solution for further improving the utilization rate of low-grade raw materials as cement raw materials, enhancing cement performance, and expanding the production of various cement varieties. When used in a ball mill, this invention achieves a screening and synergistic effect as a grinding aid by reducing the hardness of refractory materials in the raw material, improving adhesion caused by fine particle aggregation, and enhancing the dispersion effect between particles, thus effectively improving the grinding effect of the raw meal. Attached Figure Description

[0016] Figure 1 The XRD patterns of the products obtained in Examples 1-3 and Comparative Examples 1-7 are shown below. Figure 2 The compressive strength of the products obtained in Examples 1-3 and Comparative Examples 1-7; Figure 3 The content of f-CaO in the products obtained in Examples 1-3 and Comparative Examples 1-7 after calcination at 1350°C, 1400°C, and 1450°C.

[0017] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0018] The reagents and instruments used in this invention are all commercially available.

[0019] To make the objectives and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings, embodiments, and comparative examples. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Therefore, within the scope of the claims and their equivalents, the present invention can be practiced in ways different from the specific description below.

[0020] Example 1: This embodiment provides a low-grade raw material for preparing cement clinker and its proportion. The raw materials for preparing cement clinker include low-grade limestone, sandstone, slag, and contaminated soil. The ratio of the sum of the masses of low-grade limestone, sandstone, slag, and contaminated soil to the mass of the low-grade cement raw material grinding aid (hereinafter referred to as grinding aid) of this application is 99.9%:0.1%. The grinding aid, according to the weight of the constituent raw materials, consists of: 5g triisopropanolamine, 20g triethanolamine, 5g acetone, 5g sodium silicate, 15g potassium xanthate, 10g sodium polyacrylate, and 40g deionized water.

[0021] The preparation method of this grinding aid includes the following steps: 1. Calculate the dosage of each component according to its weight proportion in the grinding aid and weigh them accordingly; 2. Mix triisopropanolamine, triethanolamine, and deionized water in a specified ratio, stir magnetically for 30 minutes, then add acetone and stir until homogeneous to obtain product A; 3. Add sodium polyacrylate, potassium xanthate, and sodium silicate to product A sequentially and stir until homogeneous to obtain the raw material grinding aid; 4. Spray the prepared grinding aid evenly into the mill containing the raw material to be ground using a spray agent.

[0022] Example 2: This embodiment provides a method for preparing cement clinker using low-grade limestone raw material and its proportion. The raw materials used to prepare cement clinker include low-grade limestone, sandstone, slag, and contaminated soil. The ratio of the sum of the masses of low-grade limestone, sandstone, slag, and contaminated soil to the mass of grinding aid is 99.9%:0.1%. The grinding aid, based on the weight of the constituent raw materials, consists of: 10g triisopropanolamine, 10g triethanolamine, 5g acetone, 5g sodium silicate, 20g potassium xanthate, 15g sodium polyacrylate, and 45g deionized water.

[0023] The preparation method of this grinding aid includes the following steps: 1. Calculate the dosage of each component according to its weight proportion in the grinding aid and weigh them accordingly; 2. Mix triisopropanolamine, triethanolamine, and deionized water in a specified ratio, stir magnetically for 30 minutes, then add acetone and stir until homogeneous to obtain product A; 3. Add sodium polyacrylate, potassium xanthate, and sodium silicate to product A sequentially and stir until homogeneous to obtain the raw material grinding aid; 4. Spray the prepared grinding aid evenly into the mill containing the raw material to be ground using a spray agent.

[0024] Example 3: This embodiment provides a method for preparing cement clinker using low-grade limestone raw material and its proportion. The raw materials used to prepare cement clinker include low-grade limestone, sandstone, slag, and contaminated soil. The ratio of the sum of the masses of low-grade limestone, sandstone, slag, and contaminated soil to the mass of grinding aid is 99.9%:0.1%. The grinding aid, based on the weight of the constituent raw materials, consists of: 10g triisopropanolamine, 10g triethanolamine, 10g acetone, 5g sodium silicate, 5g potassium xanthate, 10g sodium polyacrylate, and 50g deionized water.

[0025] The preparation method of this grinding aid includes the following steps: 1. Calculate the dosage of each component according to its weight proportion in the grinding aid and weigh them accordingly; 2. Mix triisopropanolamine, triethanolamine, and deionized water in a specified ratio, stir magnetically for 30 minutes, then add acetone and stir until homogeneous to obtain product A; 3. Add sodium polyacrylate, potassium xanthate, and sodium silicate to product A in sequence and stir until homogeneous to obtain raw material grinding aid; 4. Spray the prepared grinding aid evenly into the mill containing the raw material to be ground using a spray agent.

[0026] Comparative Example 1: This embodiment provides a method for preparing cement clinker using low-grade limestone raw material and the mixing ratio. The difference between this embodiment and Embodiment 1 is that no grinding aid is added, while the other preparation methods and conditions are the same as in Embodiment 1.

[0027] Comparative Example 2: This embodiment provides a method for preparing cement clinker using low-grade limestone raw material and its proportion. The raw materials used to prepare cement clinker include low-grade limestone, sandstone, slag, and contaminated soil. The ratio of the sum of the masses of low-grade limestone, sandstone, slag, and contaminated soil to the mass of grinding aid is 99.9%:0.10%. The grinding aid, based on the weight of the constituent raw materials, consists of: 15g triisopropanolamine, 10g triethanolamine, 10g potassium xanthate, 15g sodium polyacrylate, 5g sodium silicate, and 45g deionized water.

[0028] The preparation method and conditions for this grinding aid are the same as those in Example 1.

[0029] Comparative Example 3: This embodiment provides a method for preparing cement clinker using low-grade limestone raw material and its proportion. The raw materials used to prepare cement clinker include low-grade limestone, sandstone, slag, and contaminated soil. The ratio of the sum of the masses of low-grade limestone, sandstone, slag, and contaminated soil to the mass of grinding aid is 99.95%:0.05%. The grinding aid, based on the weight of the constituent raw materials, consists of: 10g triethanolamine, 15g triisopropanolamine, 15g potassium xanthate, 15g sodium polyacrylate, and 45g deionized water.

[0030] The preparation method and conditions for this grinding aid are the same as those in Example 1.

[0031] Comparative Example 4: This embodiment provides a method for preparing cement clinker using low-grade limestone raw material and its proportion. The raw materials used to prepare cement clinker include low-grade limestone, sandstone, slag, and contaminated soil. The ratio of the sum of the masses of low-grade limestone, sandstone, slag, and contaminated soil to the mass of grinding aid is 99.9%:0.10%. The grinding aid, based on the weight of the constituent raw materials, consists of: 20g triethanolamine, 10g triisopropanolamine, 10g potassium xanthate, 10g sodium silicate, and 45g deionized water.

[0032] The preparation method and conditions for this grinding aid are the same as those in Example 1.

[0033] Comparative Example 5: This embodiment provides a method for preparing cement clinker using low-grade limestone raw material and its proportion. The raw materials used to prepare cement clinker include low-grade limestone, sandstone, slag, and contaminated soil. The ratio of the sum of the masses of low-grade limestone, sandstone, slag, and contaminated soil to the mass of grinding aid is 99.9%:0.10%. The grinding aid, based on the weight of the constituent raw materials, consists of: 25g triethanolamine, 15g triisopropanolamine, 10g sodium silicate, and 50g deionized water.

[0034] The preparation method and conditions of this grinding aid are the same as those in Example 1.

[0035] Comparative Example 6: This embodiment provides a method for preparing cement clinker using low-grade limestone raw material and its proportion. The raw materials used to prepare cement clinker include low-grade limestone, sandstone, slag, and contaminated soil. The ratio of the sum of the masses of low-grade limestone, sandstone, slag, and contaminated soil to the mass of grinding aid is 99.9%:0.10%. The grinding aid, based on the weight of the constituent raw materials, consists of: 15g triisopropanolamine, 5g triethanolamine, 5g acetone, 10g sodium silicate, 10g potassium xanthate, 15g sodium polyacrylate, and 40g deionized water.

[0036] The preparation method of this grinding aid is the same as that in Example 1.

[0037] (a) Raw material performance testing: The effects of raw meal grinding aids on the particle size distribution and calcination of cement raw meal are shown in Table 1. The results show that after adding the grinding aid, the fineness of the raw meal in this example decreased by approximately 18.16% compared to Comparative Example 1, and the particle size distribution was more reasonable. This demonstrates that this method can effectively improve the grinding effect of low-grade raw materials. Comparative Examples 6 and 7 show that the optimal dosage of the grinding aid is 0.1%.

[0038] Table 1

[0039] (II) Clinker performance testing: Figure 2 The effects of the examples and comparative examples on the compressive strength of clinker are shown. The 3-day and 7-day compressive strengths of Example 1 are significantly improved compared to Comparative Example 1 without any measures. Figure 3 It can be seen that after adding grinding aids at calcination temperatures of 1350℃, 1400℃, and 1450℃, the f-CaO content decreased from 3.34% and 2.52% and 1.40% to 2.21% and 1.52% and 0.83%, respectively, indicating that the addition of the present invention can improve the burnability of raw materials. Furthermore, comparing the reduction in f-CaO content under different dosages and different grinding aids demonstrates that the addition of the present invention has a more significant effect on improving the burnability of raw materials.

Claims

1. A low-grade cement raw meal grinding aid, characterized in that, It is composed of triethanolamine, triisopropanolamine, sodium silicate, acetone, sodium polyacrylate, potassium xanthate, and deionized water; and by weight, it specifically selects one of the following three components: The first component includes 20g of triethanolamine, 5g of triisopropanolamine, 5g of sodium silicate, 5g of acetone, 10g of sodium polyacrylate, 15g of potassium xanthate, and 40g of deionized water. The second component includes 10g of triethanolamine, 10g of triisopropanolamine, 5g of sodium silicate, 5g of acetone, 15g of sodium polyacrylate, 20g of potassium xanthate, and 45g of deionized water. The third component includes 10g of triethanolamine, 10g of triisopropanolamine, 5g of sodium silicate, 10g of acetone, 10g of sodium polyacrylate, 5g of potassium xanthate, and 50g of deionized water.

2. A method for preparing the low-grade cement raw meal grinding aid according to claim 1, characterized in that, The process includes the following steps: triisopropanolamine, triethanolamine and deionized water are mixed in a certain proportion, acetone is added and stirred evenly, and then sodium polyacrylate, potassium xanthate and sodium silicate are added in sequence and stirred evenly to obtain a low-grade cement raw material grinding aid.

3. The method for preparing the low-grade cement raw meal grinding aid as described in claim 2, characterized in that, Triisopropanolamine, triethanolamine and deionized water were mixed in proportion and stirred magnetically for 30 minutes.

4. The low-grade cement raw meal grinding aid prepared by the method of claim 1 or any of claims 2 or 3 is used in a ball mill.

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