A composition for ordinary portland cement clinker ball milling and its application

Abstract

This invention discloses a composition for ball milling ordinary silicate cement clinker. The composition comprises an alkanolamine compound, a sodium salt, compound A, and water. The mass ratio of the alkanolamine compound to the sodium salt, compound A, and water is 1:(1-2):(0.5-1):(2-5), wherein compound A is a polyether and / or sugar. This invention further increases the dosage of the admixture in the ball milling of ordinary aluminosilicate cement clinker. The increased dosage significantly enhances the grinding aid effect of the composition, further strengthening the cement while improving its quality. Using the composition of this invention also reduces the amount of grinding media used, thereby reducing grinding media consumption and mill power consumption while further improving grinding efficiency and output.

Description

Technical Field

[0001] This invention relates to the field of cement admixtures, and more specifically to a composition for ball milling ordinary silicate cement clinker and its application. Background Technology

[0002] Cement production is an industry with low energy efficiency and high energy consumption, making the reduction of energy consumption and carbon dioxide emissions in cement production a crucial task. "Two grindings and one firing" is the core process of cement production, with ordinary Portland cement clinker grinding being one of the two grindings. It is one of the main energy-consuming processes in the cement industry and also the first step in the "two grindings and one firing" process. The quality of ordinary Portland cement clinker directly affects the quality and effectiveness of the ordinary Portland cement clinker firing process, and is key to reducing energy consumption and carbon emissions in cement production, thus crucial for achieving sustainable development in the cement industry.

[0003] Ordinary silicate cement clinker grinding typically involves grinding ordinary silicate cement clinker together with a certain amount of gypsum. This is a mineral material crushing process, and the energy consumption aims to reduce the particle size and increase the surface energy of the particles. Ball milling is commonly used to crush the material particles. Most of the energy is consumed in the wear and temperature rise generated inside the mill. Furthermore, the increased surface energy due to reduced particle fineness, coupled with the opposite charge on the newly formed surfaces after crushing, leads to a tendency for the crushed particles to aggregate and agglomerate, further reducing the energy utilization efficiency of the grinding process.

[0004] Admixtures for ordinary silicate cement clinker can improve the energy utilization efficiency of grinding. These admixtures adsorb onto the particle surface, reducing the surface energy of the particles, neutralizing the charge on the fracture surface, improving particle dispersion, reducing the average particle size and average mass, and narrowing the particle size distribution range.

[0005] Current admixtures for ordinary Portland cement clinker have limited effects. Firstly, the dosage is limited, not exceeding 0.02%, resulting in limited effectiveness. Secondly, the improvement in quality is limited due to the dosage restriction, which restricts the enhancement of cement performance. Therefore, there is an urgent need for an admixture that can significantly improve the energy utilization efficiency of grinding while simultaneously enhancing the effect of grinding ordinary Portland cement clinker alone. Summary of the Invention

[0006] To address the issue of how to improve the admixture effect of ordinary silicate cement clinker during grinding, this invention provides a composition for ball milling ordinary silicate cement clinker. The composition uses an alkanolamine compound as the main component to prepare an admixture for ordinary silicate cement clinker. By increasing the dosage of the composition, the grinding efficiency of ordinary silicate cement clinker is improved, thereby enhancing the quality of the ordinary silicate cement clinker powder.

[0007] The composition comprises an alkanolamine compound, a sodium salt, compound A, and water in a mass ratio of 1:(1-2):(0.5-1):(2-5), wherein compound A is a polyether and / or a sugar.

[0008] As a preferred embodiment of the present invention, the alkanolamine compound is a combination of two or more of dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine; the sodium salt is sodium thiocyanate and / or sodium chloride; and the conductivity of the water needs to be lower than 60 μS / cm to avoid the formation of precipitates with calcium and magnesium ions in the water after hydrolysis of the alkanolamine, which would compromise its stability.

[0009] As a preferred embodiment of the present invention, the polyether is a polyol polyether with a molecular weight of less than 800 and a small molecule polyol as a substrate. The use of the above-mentioned polyether can further improve the grinding efficiency and the performance of cement products, while preventing particle accumulation during grinding and reducing energy consumption in the production process. The sugar is sucrose or glucose. Since sugar has multiple hydroxyl polar groups, it is beneficial to eliminate static electricity, adsorb onto the surface of ultrafine particles, reduce agglomeration, and improve grinding efficiency.

[0010] A second objective of this invention is to provide an application of the above composition as a cement admixture.

[0011] A third objective of this invention is to provide an application of the above-mentioned composition in improving the grinding efficiency of ordinary silicate cement clinker, wherein the dosage of the composition is 0.4‰ to 1.6‰ of the mass of ordinary silicate cement clinker; the addition of the composition of this invention can improve grinding efficiency and reduce mill power consumption while reducing the amount of grinding media used in the ball mill.

[0012] As a preferred embodiment of the present invention, the dosage of the composition is 0.8‰ to 1.2‰ of the mass of ordinary silicate cement clinker.

[0013] The beneficial effects of this invention are:

[0014] 1. The dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine used in this invention are all small-molecule trihydroxyalkyl tertiary amines with molecular weights of 163.1, 177.2, and 191.3, respectively. They are amphiphilic polar organic compounds composed of one tertiary amine group, three hydroxyl groups, and three short carbon chains. Experiments have shown that any two combinations of the above significantly improve the grinding efficiency of ordinary Portland cement clinker, thereby increasing the compressive strength of the ordinary Portland cement clinker powder (tested according to ISO standards).

[0015] 2. This invention further increases the dosage of admixtures in the ball milling of ordinary aluminosilicate cement clinker. The increased dosage greatly enhances the grinding aid effect of the composition, further strengthening the cement strength while improving the quality of the cement.

[0016] 3. Using the composition of the present invention also reduces the amount of grinding media used, thereby reducing grinding media consumption and mill power consumption while further improving grinding efficiency and output. Detailed Implementation

[0017] The technical solution of the present invention will be described in detail below through specific embodiments, but the scope of protection of the present invention is not limited to the embodiments described.

[0018] Where specific techniques or conditions are not specified in the examples, they shall be performed in accordance with the techniques or conditions described in the literature in this field, or in accordance with the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels.

[0019] Unless otherwise specified, the experimental methods used in the following examples are conventional methods. Unless otherwise specified, the experimental materials used in the following examples are commercially available products.

[0020] Comparative Example 1

[0021] Composition ratio of commercially available products:

[0022] The mass ratio of triethanolamine isopropanolamine, sodium chloride, glucose, and water is 1:1:0.5:3.

[0023] Comparative Example 2

[0024] Composition ratio:

[0025] The mass ratio of triisopropanolamine ethanolamine: sodium thiocyanate: sucrose: water is 1:1:0.5:2.

[0026] Example 1

[0027] Composition ratio:

[0028] The mass ratio of the alkanolamine compound to the sodium salt, compound A, and water is 1:1:0.5:2. Among the alkanolamine compounds, the mass ratio of dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine is 4:1:1. Among the sodium salts, the mass ratio of sodium thiocyanate to sodium chloride is 1:1. Among the compounds A, the mass ratio of sucrose to polyether is 1:1.

[0029] Example 2

[0030] Composition ratio:

[0031] The mass ratio of the amine compound to the sodium salt, compound A, and water is 1:2:0.5:4. Among the amine compounds, the mass ratio of dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine is 4:0:1. Among the sodium salts, the mass ratio of sodium thiocyanate to sodium chloride is 1:1. Among the compounds, the mass ratio of glucose to polyether is 1:1.

[0032] Example 3

[0033] Composition ratio:

[0034] The mass ratio of the alkanolamine compound to the sodium salt, compound A, and water is 1:1:1.0:3. Among the alkanolamine compounds, the mass ratio of dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine is 4:0:1. Among the sodium salts, the mass ratio of sodium thiocyanate to sodium chloride is 1:1. Among the compounds, the mass ratio of sucrose to polyether is 1:1.

[0035] Example 4

[0036] Composition ratio:

[0037] The mass ratio of the amine compound to the sodium salt, compound A, and water is 1:2:0.5:5. Among the amine compounds, the mass ratio of dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine is 4:1:1. Among the sodium salts, the mass ratio of sodium thiocyanate to sodium chloride is 0:1. Among the compounds, the mass ratio of sucrose to polyether is 1:1.

[0038] Example 5

[0039] Composition ratio:

[0040] The mass ratio of the amine compound to the sodium salt, compound A, and water is 1:1:0.5:3. Among the amine compounds, the mass ratio of dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine is 2:1:0. Among the sodium salts, the mass ratio of sodium thiocyanate to sodium chloride is 1:1. Among the compounds, the mass ratio of glucose to polyether is 1:1.

[0041] Example 6

[0042] Composition ratio:

[0043] The mass ratio of the amine compound to the sodium salt, compound A, and water is 1:2:0.5:4. Among the amine compounds, the mass ratio of dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine is 2:1:0. Among the sodium salts, the mass ratio of sodium thiocyanate to sodium chloride is 1:1. Among the compounds, the mass ratio of sucrose to polyether is 1:1.

[0044] Example 7

[0045] Composition ratio:

[0046] The mass ratio of the alkanolamine compound to the sodium salt, compound A, and water is 1:1:0.5:2. Among the alkanolamine compounds, the mass ratio of dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine is 2:1:0. Among the sodium salts, the mass ratio of sodium thiocyanate to sodium chloride is 1:1. Among the compounds A, the mass ratio of sucrose to polyether is 1:1.

[0047] Example 8

[0048] Composition ratio:

[0049] The mass ratio of the amine compound to the sodium salt, compound A, and water is 1:2:0.5:5. Among the amine compounds, the mass ratio of dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine is 2:1:0. Among the sodium salts, the mass ratio of sodium thiocyanate to sodium chloride is 0:1. Among the compounds, the mass ratio of glucose to polyether is 1:1.

[0050] Example 9

[0051] Composition ratio:

[0052] The mass ratio of the alkanolamine compound to the sodium salt, compound A, and water is 1:1:0.5:2. Among the alkanolamine compounds, the mass ratio of dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine is 1:4:0. Among the sodium salts, the mass ratio of sodium thiocyanate to sodium chloride is 1:1. Among the compounds, the mass ratio of sucrose to polyether is 1:1.

[0053] Example 10

[0054] Composition ratio:

[0055] The mass ratio of the alkanolamine compound to the sodium salt, compound A, and water is 1:2:0.5:4. Among the alkanolamine compounds, the mass ratio of dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine is 1:4:0. Among the sodium salts, the mass ratio of sodium thiocyanate to sodium chloride is 1:1. Among the compounds A, the mass ratio of sucrose to polyether is 1:1.

[0056] Example 11

[0057] Composition ratio:

[0058] The mass ratio of the alkanolamine compound to the sodium salt, compound A, and water is 1:1:0.5:2. Among the alkanolamine compounds, the mass ratio of dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine is 1:4:0. Among the sodium salts, the mass ratio of sodium thiocyanate to sodium chloride is 1:1. Among the compounds, the mass ratio of glucose to polyether is 1:1.

[0059] Example 12

[0060] Composition ratio:

[0061] The mass ratio of the alkanolamine compound to the sodium salt, compound A, and water is 1:2:0.5:4. Among the alkanolamine compounds, the mass ratio of dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine is 1:4:0. Among the sodium salts, the mass ratio of sodium thiocyanate to sodium chloride is 1:1. Among the compounds A, the mass ratio of sucrose to polyether is 1:1.

[0062] Example 13

[0063] Composition ratio:

[0064] The mass ratio of the alkanolamine compound to the sodium salt, compound A, and water is 1:1:0.5:2. Among the alkanolamine compounds, the mass ratio of dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine is 0:4:1. Among the sodium salts, the mass ratio of sodium thiocyanate to sodium chloride is 1:0. Among the compounds, the mass ratio of sucrose to polyether is 1:1.

[0065] Example 14

[0066] Composition ratio:

[0067] The mass ratio of the alkanolamine compound to the sodium salt, compound A, and water is 1:2:0.5:4. Among the alkanolamine compounds, the mass ratio of dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine is 0:4:1. Among the sodium salts, the mass ratio of sodium thiocyanate to sodium chloride is 1:1. Among the compounds, the mass ratio of glucose to polyether is 1:1.

[0068] Example 15

[0069] Composition ratio:

[0070] The mass ratio of the alkanolamine compound to the sodium salt, compound A, and water is 1:1:1.0:2. Specifically, the mass ratio of dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine in the alkanolamine compound is 0:4:1. The mass ratio of sodium thiocyanate to sodium chloride in the sodium salt is 1:1. The mass ratio of sucrose to polyether in compound A is 1:0. The grinding test method for ordinary silicate cement clinker is as follows:

[0071] Ordinary silicate cement clinker and dihydrate gypsum that meet the requirements are prepared in a mass ratio of 95:5, and 5 kg is prepared. The mixture is then ground according to the conditions in Appendix A of GB / T 26748-2011 "Cement Grinding Aids" that meet the requirements of A.3 until the residue on an 80-micron sieve is less than 1.0%. The grinding time T0 and the residue on a 45-micron sieve are recorded.

[0072] Ordinary silicate cement clinker and dihydrate gypsum were prepared in a mass ratio of 95:5 to make 5 kg. The composition in the above examples and comparative examples was added to the clinker particles according to the dosage (based on 5 kg). According to Appendix A of GB / T26748-2011 "Cement Grinding Aids" and meeting the requirements of A.3, the pellets were reduced by a certain amount. The grinding time T0 was recorded, and the residue on the 45-micron sieve and the residue on the 80-micron sieve were recorded.

[0073] Table 1 Standard Configuration of Grinding Media for Standard Small Grinding Mills

[0074]

[0075]

[0076] The strength and standard consistency water requirement of the ground cement clinker powder were tested according to GB / T 17671-1999 "Test Method for Strength of Cement Mortar" and GB / T1346-2011 "Test Method for Standard Consistency Water Requirement of Cement". The results are shown in Table 2.

[0077] Table 2 Evaluation Table of Grinding Test Results of Ordinary Silicate Cement Clinker at the Same Grinding Time

[0078]

[0079]

[0080]

[0081] According to the results in Table 2, when using 100 kg of grinding media, the addition of the composition of the comparative example resulted in a slight decrease in the residue on the 80-micron sieve and a decrease in the residue on the 45-micron sieve. With the increase of the dosage, the residue on the 80-micron sieve and the residue on the 45-micron sieve did not decrease further, but the compressive strength decreased significantly.

[0082] As the amount of grinding media decreased while the dosage range of the composition was increased, the 80-micron sieve residue and 45-micron sieve residue of the comparative composition increased and the grinding efficiency decreased, and the compressive strength also decreased accordingly. Compared with the comparative example and the blank, the 80-micron sieve residue and 45-micron sieve residue of the example were reduced more, the grinding efficiency was increased, and the compressive strength was further improved.

[0083] In summary, the composition of the present invention further increases the upper limit of the composition dosage when ball milling ordinary silicate cement clinker, and significantly improves both the grinding efficiency and the compressive strength of cement clinker powder; the composition of the present invention shows particularly significant improvement in grinding efficiency and compressive strength of cement clinker powder when the dosage is 0.8‰ to 1.2‰.

[0084] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A composition for ball milling ordinary silicate cement clinker, characterized in that, The composition comprises an alkanolamine compound, a sodium salt, compound A, and water in a mass ratio of 1:(1-2):(0.5-1):(2-5), wherein compound A is a polyether and / or a sugar.

2. The composition according to claim 1, characterized in that, The alkanolamine compound is a combination of two or more of dihydroxyethyl isopropanolamine, hydroxyethyl diisopropanolamine, and triisopropanolamine.

3. The composition according to claim 1, characterized in that, The sodium salt is sodium thiocyanate and / or sodium chloride.

4. The composition according to claim 1, characterized in that, The electrical conductivity of the water is less than 60 μS / cm.

5. The composition according to claim 1, characterized in that, The polyether is a polyol polyether with a molecular weight of less than 800 and a small molecule polyol as a substrate.

6. The composition according to claim 1, characterized in that, The sugar is sucrose or glucose.

7. The use of the composition according to claims 1 to 6 as a cement admixture.

8. The application of the composition according to claims 1 to 6 in improving the grinding efficiency of ordinary silicate cement clinker, characterized in that, The dosage of the composition is 0.4‰ to 1.6‰ of the mass of ordinary silicate cement clinker.

9. The application according to claim 8, characterized in that, The dosage of the composition is 0.8‰ to 1.2‰ of the mass of ordinary silicate cement clinker.

Images