Multifunctional composite admixture for improving clinker burning quality and its preparation method and application

Abstract

The application provides a multifunctional composite admixture for improving clinker sintering quality and a preparation method and application thereof. Raw materials include 5-30% of grinding aid components, 5-20% of decomposition promoting components, 5-30% of inorganic mineralization components, and the rest is deionized water. The grinding aid components are selected from the group consisting of Tween surfactants, dodecyl trimethyl ammonium chloride and fulvic acid; the decomposition promoting components include zinc dihydrogen phosphate, potassium bromide, magnesium fluosilicate, water and potassium fluoride; and the inorganic mineralization components include NaCeF4 doped with Gd 3+ , Yb 3+ . Compared with the prior art, the multifunctional composite raw material admixture can reduce the content of free calcium oxide in cement clinker, improve the sintering quality of the clinker, has the functions of grinding aid and energy saving, reduces energy consumption, and has application potential and use value in the cement production industry.

Description

Technical Field

[0001] This invention belongs to the field of cement calcination technology, specifically relating to a multifunctional composite admixture for improving clinker calcination quality, its preparation method, and its application. Background Technology

[0002] The cement industry is a crucial raw material for infrastructure construction and forms the backbone of modern urban buildings. Its applications are widespread and its consumption is substantial. With the increasing scale of infrastructure projects, the demand for cement is also growing daily. The continuous development of the cement industry has led to a gradual increase in the consumption of high-quality ore raw materials, while the surplus of low-grade ore is increasing. To ensure cement quality, the production process requires more energy. Even so, the produced cement may still be substandard. Therefore, it is urgent to improve cement quality and reduce environmental pollution and energy consumption.

[0003] Clinker is a major component of cement products, and its quality determines the quality of the cement. Free calcium oxide (f-CaO) in cement clinker refers to excess calcium oxide that fails to participate in clinker mineral formation during the clinker calcination reaction and exists in a free state. Its presence affects the strength and stability of cement clinker. Therefore, the f-CaO content in clinker is commonly used to measure the burnability of the raw materials and the calcination quality of the clinker. Improving the quality of cement clinker can, on the one hand, improve the grindability of cement, reduce calcination heat consumption, and increase cement strength; on the other hand, it can also reduce calcination energy consumption, achieving sustainable development of the cement industry.

[0004] Clinker quality is often influenced by multiple factors. From raw meal mining to calcination in the rotary kiln, most processes affect clinker quality, making it difficult to control it from a single perspective. Cement production can be broadly summarized as "two grindings and one calcination," namely, raw meal grinding, clinker calcination, and cement grinding. The first two stages can be used to regulate the quality of the later clinker stages. Currently, barite, sulfides, gypsum, and other components are often added to the raw meal to improve clinker calcination quality. However, these substances often suffer from problems such as high dosage, limited effects, and unstable clinker quality, thus affecting cement quality. Summary of the Invention

[0005] The purpose of this invention is to provide a multifunctional composite admixture for improving the clinker firing quality and its preparation method. By utilizing the designed compound composition and the synergistic effect of each raw material, the free calcium oxide content in cement clinker can be reduced, with the main goal of improving the clinker firing quality. At the same time, it also has the effects of grinding aid and energy saving, reducing energy consumption. It has application potential and use value in the cement production industry.

[0006] Another objective of this invention is to provide an application of a multifunctional composite admixture for improving the clinker firing quality in cement.

[0007] The specific technical solution of this invention is as follows:

[0008] A multifunctional composite admixture for improving clinker firing quality comprises the following raw materials by weight percentage:

[0009] The grinding aid component is 5-30%, the decomposition promoter component is 5-20%, the inorganic mineralization component is 5-30%, and the remaining component is deionized water.

[0010] The grinding aid component is selected from Tween series surfactants, dodecyltrimethylammonium chloride and fulvic acid;

[0011] Preferably, the grinding aid component is a mixture of Tween series surfactants, dodecyltrimethylammonium chloride and fulvic acid in a mass ratio of 20-25:15-20:10-20.

[0012] The surfactant is selected from one or more of Tween 40, Tween 60, and Tween 80;

[0013] The decomposition-promoting components include zinc dihydrogen phosphate, potassium bromide, magnesium fluorosilicate dihydrate and potassium fluoride;

[0014] Preferably, the decomposition-promoting component is obtained by mixing zinc dihydrogen phosphate, potassium bromide, magnesium fluorosilicate, dihydrate, and potassium fluoride in a mass ratio of 1-3:2-4:3-6:1-3.

[0015] The inorganic mineralization component includes Gd doping. 3+ Yb 3+ NaCeF4.

[0016] The inorganic mineralization component is doped with Gd. 3+ Yb 3+ NaCeF4 was obtained through the following steps: 0.5 mol GdCl3·6H2O, 0.5 mol CeCl3·6H2O, and 0.5 mol YbCl3·6H2O were taken respectively, and 0.3 mol NaOH solid was weighed. 0.5 mol oleic acid (OA), 0.5 mol oleylamine (OM), and 0.5 mol anhydrous ethanol were added sequentially, followed by the addition of 30% deionized water. The mixture was stirred continuously for 30 min to obtain a clear solution. 1 mol NH4F was dissolved in 150 mL of deionized water to obtain a mixed solution. The clear solution was added dropwise to the mixed solution while stirring for 30 min. The resulting suspension was transferred to a reaction vessel and reacted at 190℃ for 10 h to obtain doped Gd. 3+ Yb 3+ NaCeF4.

[0017] The present invention provides a method for preparing a multifunctional composite additive to improve the calcination quality of clinker, specifically by mixing the raw materials in the specified amounts with the specified amounts of deionized water.

[0018] This invention provides an application of a multifunctional composite admixture for improving the clinker firing quality in cement.

[0019] This invention mainly comprises three functional components. In the grinding aid component, dodecyltrimethylammonium chloride balances the remaining valence bonds and charges on the particle surface through electrostatic adsorption, preventing the grinding particles from agglomerating. In addition to electrostatic adsorption, the grinding aid has other effects on the raw material surface. For example, in this invention, the -OH group in the Tween series structure forms hydrogen bonds with the oxygen-containing functional groups on the surface of the raw material minerals and embeds itself into the particle surface, reducing the oxygen-containing functional groups on the particle surface and thus indirectly changing the charge of the raw material surface. Furthermore, the hydrophobic groups in the Tween series structure escape the aqueous phase and entangle with each other on the surface of the raw material particles, causing the unadsorbed Tween molecules to interact with the adsorbed Tween molecules. Through the interaction of hydrophobic groups, the adsorption transitions from a single adsorption layer to a double adsorption layer, and the synergistic effect with hydrogen bonding increases the adsorption capacity of raw material particles, thereby improving the dispersibility of the material. Fulvic acid can dissolve part of the surface of raw minerals. In the initial stage of grinding, the dissolution effect roughens the surface of the blocky material, increases the number of pores and microcracks, and even makes them interconnected, increasing the secondary porosity. The surface of the blocky material changes from a dense structure to a loose state, making it easier to crush under mechanical force. Combined with dodecyltrimethylammonium chloride and one or more of Tween 40, Tween 60, and Tween 80, the three play different roles in the early and late stages of the grinding process, improving the grinding aid effect.

[0020] The decomposition-promoting components are zinc dihydrogen phosphate, potassium bromide, magnesium fluorosilicate, dihydrate, and potassium fluoride, and the inorganic mineralization components include Gd doped components. 3+ Yb 3+NaCeF4. Fluoride and zinc salts can accelerate the decomposition of alkaline feldspar and mica, enhance the volatilization of alkali oxides, promote the decomposition of carbonates in raw materials, accelerate the formation of C3S, and reduce the content of free calcium oxide in clinker. However, excessive addition of fluorine-containing substances can corrode various cement production equipment and cause environmental pollution. Therefore, fluorine-containing substances are no longer selected as inorganic mineralization components, but rare earth element compounds are used instead. Rare earth elements have an unfilled 4f electron shell structure, with the 4f orbital located in the inner shell of the 6d, 5s, and 6p orbitals. Their bonding ability is weak, but they can capture reactant molecules to form reactive bodies, which are then transformed into product molecules. This greatly accelerates the formation of some minerals. The process accelerates the formation rate, which in turn promotes the rapid diffusion of CaO, causing the product layer of the decomposing carbonate particles to thin rapidly, thereby accelerating the carbonate decomposition reaction. Furthermore, rare earth elements have a significant lattice distortion effect. As external doping ions, rare earth elements, with their different chemical structure parameters and acid-base properties, can cause solid solution, charge and acid-base imbalance, and lattice distortion in the main minerals and intermediate phases during clinker formation, thereby reducing the energy of the solid-liquid system, leading to premature appearance of the liquid phase, decreased liquid phase viscosity, reduced surface tension, and increased liquid phase volume. This, in turn, accelerates the rate of CaO and SiO2 to form C3S and correspondingly increases the allite content. The inorganic mineralization component of this invention simultaneously incorporates Gd... 3+ Yb 3+ Ce 3+ By incorporating three rare earth ions into a compound, adding just one substance can achieve the same effect as all three, thus avoiding the reduced mineralization caused by an imbalance in the proportions of the mineralizing components in a compound. (Gd) 3+ Yb 3+ Ce 3+ Ca substitution occurs at sites, causing lattice deformation, accompanied by the substitution of Ca. 2+ The resulting imbalance of additional positive charges leads to vacancies and interstitial solid solutions, resulting in the formation of highly electronegative halide anions (F). - It replaces oxygen ions on the one hand, and makes [MeO4]... 5- ←→[MeO6] 9- In equilibrium, the latter dissociates into individual ions, reducing the viscosity of the liquid phase. During the calcination of cement clinker, the solid solution effect, acid-base balance, and charge balance work synergistically to lower the liquid phase emergence temperature, reduce the liquid phase viscosity, and increase the amount of liquid phase, thus accelerating the calcination of Ca. 2+ The reaction rate of Ca with SiO2 to form C3S is related to the overall amount of Ca participating in the reaction. 2+ The increase in aliquots results in the formation of sufficient allite, reduces the amount of residual f-CaO, and improves the clinker firing quality.

[0021] The beneficial effects of this invention are that different functional components complement each other to improve the quality of clinker calcination. The grinding aid component is an organic material that can increase the specific surface area of ​​the raw material, reduce the residue on the 80μm sieve, improve grinding efficiency, mill output, and material crushing degree, and reduce power consumption. In addition to the above-mentioned grinding aid effects, the crystalline structure of the siliceous raw material is destroyed after grinding, resulting in an unstable new ecological surface, which can increase the reactivity of SiO2 during calcination and increase the probability of SiO2 reacting with CaO, thereby reducing the formation of free calcium oxide and incidentally improving the quality of clinker. The decomposition promoting component and inorganic mineralization component are rare earth element compounds and fluorine-containing compounds, which can accelerate the decomposition of carbonates in calcareous raw materials or decompose them at lower temperatures, reduce the coal consumption required for carbonate decomposition, promote the decomposition of carbonates to produce more highly active CaO, and cause solid solution effect, acid-base balance, and charge balance during clinker formation, reducing the reaction activation energy of clinker minerals, increasing the formation rate and quantity of clinker minerals, increasing the probability of SiO2 reacting with CaO, and thus improving the quality of clinker. In this invention, multiple components interact, with different components playing a role at different stages of the cement clinker production process. However, each component is not limited to a single function. The ultimate goal is to improve clinker quality, while also having grinding aid and decomposition promotion functions. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and should not be used to limit the scope of protection of the present invention.

[0023] The water used in this invention is preferably deionized water.

[0024] Example 1

[0025] A multifunctional composite admixture for improving clinker calcination quality is composed of the following components by mass percentage: 10% grinding aid, 5% decomposition promoter, 15% inorganic mineralizing component, and the balance being deionized water.

[0026] The grinding aid component is obtained by mixing Tween 80, dodecyltrimethylammonium chloride and fulvic acid in a mass ratio of 25:20:10.

[0027] The decomposition-promoting component is obtained by mixing zinc dihydrogen phosphate, potassium bromide, magnesium fluorosilicate, dihydrate, and potassium fluoride in a mass ratio of 1:2:4:3.

[0028] The inorganic mineralization component is doped with Gd. 3+ Yb 3+NaCeF4 was obtained through the following steps: 0.5 mol GdCl3·6H2O, 0.5 mol CeCl3·6H2O, and 0.5 mol YbCl3·6H2O were taken respectively, and 0.3 mol NaOH solid was weighed. 0.5 mol oleic acid (OA), 0.5 mol oleylamine (OM), and 0.5 mol anhydrous ethanol were added sequentially, followed by the addition of 30% deionized water. The mixture was stirred continuously for 30 min to obtain a clear solution. 1 mol NH4F was dissolved in 150 mL of deionized water, and the resulting clear solution was slowly added dropwise to the mixed solution while stirring for 30 min. The resulting suspension was transferred to a reaction vessel and reacted at 190 °C for 10 h to obtain doped Gd. 3+ Yb 3+ NaCeF4.

[0029] After mixing the three functional components (grind aid component, decomposition promoter component, inorganic mineralization component, and deionized water in the above formula amount) and stirring for 10 minutes, a multifunctional composite additive is obtained.

[0030] Example 2

[0031] A multifunctional composite admixture for improving clinker calcination quality is composed of the following components by mass percentage: 15% grinding aid, 5% decomposition promoter, 10% inorganic mineralizing component, and the balance being deionized water.

[0032] The grinding aid component is obtained by mixing Tween 80, dodecyltrimethylammonium chloride and fulvic acid in a mass ratio of 25:20:10.

[0033] The decomposition-promoting component is obtained by mixing zinc dihydrogen phosphate, potassium bromide, magnesium fluorosilicate, dihydrate, and potassium fluoride in a mass ratio of 1:2:4:3.

[0034] The inorganic mineralization component is doped with Gd. 3+ Yb 3+ NaCeF4 was obtained through the following steps: 0.5 mol GdCl3·6H2O, 0.5 mol CeCl3·6H2O, and 0.5 mol YbCl3·6H2O were taken respectively, and 0.3 mol NaOH solid was weighed. 0.5 mol oleic acid (OA), 0.5 mol oleylamine (OM), and 0.5 mol anhydrous ethanol were added sequentially, followed by the addition of 30% deionized water. The mixture was stirred continuously for 30 min to obtain a clear solution. 1 mol NH4F was dissolved in 150 mL of deionized water, and the resulting clear solution was slowly added dropwise to the mixed solution while stirring for 30 min. The resulting suspension was transferred to a reaction vessel and reacted at 190 °C for 10 h to obtain doped Gd. 3+ Yb 3+ NaCeF4.

[0035] After mixing the three functional components (grind aid component, decomposition promoter component, inorganic mineralization component, and deionized water in the above formula amount) and stirring for 10 minutes, a multifunctional composite additive is obtained.

[0036] Example 3

[0037] A multifunctional composite admixture for improving clinker calcination quality is composed of the following components by mass percentage: 15% grinding aid, 10% decomposition promoter, 15% inorganic mineralizing component, and the balance being deionized water.

[0038] The grinding aid component is obtained by mixing Tween 80, dodecyltrimethylammonium chloride and fulvic acid in a mass ratio of 25:20:10.

[0039] The decomposition-promoting component is obtained by mixing zinc dihydrogen phosphate, potassium bromide, magnesium fluorosilicate, dihydrate, and potassium fluoride in a mass ratio of 1:2:4:3.

[0040] The inorganic mineralization component is doped with Gd. 3+ Yb 3+ NaCeF4 was obtained through the following steps: 0.5 mol GdCl3·6H2O, 0.5 mol CeCl3·6H2O, and 0.5 mol YbCl3·6H2O were taken respectively, and 0.3 mol NaOH solid was weighed. 0.5 mol oleic acid (OA), 0.5 mol oleylamine (OM), and 0.5 mol anhydrous ethanol were added sequentially, followed by the addition of 30% deionized water. The mixture was stirred continuously for 30 min to obtain a clear solution. 1 mol NH4F was dissolved in 150 mL of deionized water, and the resulting clear solution was slowly added dropwise to the mixed solution while stirring for 30 min. The resulting suspension was transferred to a reaction vessel and reacted at 190 °C for 10 h to obtain doped Gd. 3+ Yb 3+ NaCeF4.

[0041] After mixing the three functional components (grind aid component, decomposition promoter component, inorganic mineralization component, and deionized water in the above formula amount) and stirring for 10 minutes, a multifunctional composite additive is obtained.

[0042] Example 4

[0043] A multifunctional composite admixture for improving clinker calcination quality is composed of the following components by mass percentage: 20% grinding aid, 10% decomposition promoter, 20% inorganic mineralizing component, and the balance being deionized water.

[0044] The grinding aid component is obtained by mixing Tween 80, dodecyltrimethylammonium chloride and fulvic acid in a mass ratio of 25:20:10.

[0045] The decomposition-promoting component is obtained by mixing zinc dihydrogen phosphate, potassium bromide, magnesium fluorosilicate, dihydrate, and potassium fluoride in a mass ratio of 1:2:4:3.

[0046] The inorganic mineralization component is doped with Gd. 3+ Yb 3+ NaCeF4 was obtained through the following steps: 0.5 mol GdCl3·6H2O, 0.5 mol CeCl3·6H2O, and 0.5 mol YbCl3·6H2O were taken respectively, and 0.3 mol NaOH solid was weighed. 0.5 mol oleic acid (OA), 0.5 mol oleylamine (OM), and 0.5 mol anhydrous ethanol were added sequentially, followed by the addition of 30% deionized water. The mixture was stirred continuously for 30 min to obtain a clear solution. 1 mol NH4F was dissolved in 150 mL of deionized water, and the resulting clear solution was slowly added dropwise to the mixed solution while stirring for 30 min. The resulting suspension was transferred to a reaction vessel and reacted at 190 °C for 10 h to obtain doped Gd. 3+ Yb 3+ NaCeF4.

[0047] After mixing the three functional components (grind aid component, decomposition promoter component, inorganic mineralization component, and deionized water in the above formula amount) and stirring for 10 minutes, a multifunctional composite additive is obtained.

[0048] Comparative Example 1

[0049] A multifunctional composite admixture for improving the quality of clinker firing is the same as in Example 4, except that it does not contain Tween 80.

[0050] Comparative Example 2

[0051] A multifunctional composite additive for improving the quality of clinker firing is the same as in Example 4, except that it does not contain magnesium fluorosilicate.

[0052] Comparative Example 3

[0053] A multifunctional composite admixture for improving clinker calcination quality, otherwise identical to Example 4, except that the mineralized component does not contain Yb. 3+ .

[0054] Comparative Example 4

[0055] A multifunctional composite admixture for improving clinker firing quality is the same as in Example 4, except that it does not contain mineralizing components.

[0056] The raw material performance test and clinker firing quality test were conducted using the methods described above.

[0057] The grinding performance was tested according to the T / CCAS 021-2021 standard for "Cement Raw Material Grinding Aids". 5000g was used for each small mill grinding, the grinding time was set to 10 minutes, and the dosage was 1.5‰.

[0058] Take raw meal powder from Baima Cement Co., Ltd., mix the raw meal powder with multifunctional composite admixture at a dosage of 1.5‰, and put the blank sample and the admixture sample into different crucibles. Calcinate them at 780℃ for 30 minutes and measure their loss on ignition.

[0059] Take raw meal powder from Baima Cement Co., Ltd. and mix it with multifunctional composite admixture at a dosage of 1.5‰. Test the effect of multifunctional composite admixture on the burnability of raw meal according to GB / T 26566-2011 "Test Method for Burnability of Cement Raw Meal" at a test temperature of 1400℃.

[0060] The specific test results are shown in the table below:

[0061] Table 1 Results of raw meal performance testing and clinker calcination quality testing

[0062] Test number Dosage / wt% 80μm sieve residue / % Loss on ignition at 780℃ / % f-CaO content at 1400℃ / % blank 0 18.3 33.46 2.77 Example 1 0.15 17.8 34.15 2.45 Example 2 0.15 15.9 34.32 2.31 Example 3 0.15 16.1 35.81 1.83 Example 4 0.15 16.0 36.03 1.18 Comparative Example 1 0.15 15.4 35.98 1.47 Comparative Example 2 0.15 15.9 35.54 1.40 Comparative Example 3 0.15 15.8 35.38 1.65 Comparative Example 4 0.15 16.1 34.31 2.46

[0063] As shown in Table 1, the multifunctional composite admixture composed of grinding aid, decomposition promoter, and mineralizing component can effectively reduce the residue on the 80μm sieve of raw meal, increase the content of fine particles, the content of free calcium oxide in clinker at 1400℃, and increase the loss on ignition of raw meal at 780℃. This indicates that the admixture provided by the present invention has the effects of improving burnability, grindability, and decomposition promotion. In Examples 1-3 and Comparative Examples 1-4, the percentage of residue on the 80μm sieve gradually decreased with the increase of grinding aid component content, the loss on ignition at 780℃ gradually increased with the increase of decomposition promoter component content, and the free calcium oxide in clinker at 1400℃ gradually decreased with the increase of mineralizing component. Compared with Example 1, Example 2 showed an increase in grinding aid component and a decrease in mineralizing component, but the free calcium oxide content in Example 2 was not significantly different from that in Example 1, showing no increase. This indicates that the grinding aid component plays a role in improving clinker quality to a certain extent. In Comparative Example 1, removing one or more of Tween 40, Tween 60, and Tween 80 significantly reduced the grinding aid effect compared to Example 4, and also lowered the free calcium oxide content. In Comparative Example 2, removing magnesium fluorosilicate significantly reduced the decomposition promotion effect compared to Example 4, decreased the loss on ignition, and increased the free calcium oxide content, but did not significantly affect the grinding aid effect. In Comparative Example 3, Gd-doped... 3+ Yb 3+ Yb in NaCeF4 3+ After removal, the mineralization effect was significantly affected compared to Example 4, with a marked increase in free calcium oxide content and a decrease in loss on ignition; in Comparative Example 4, the mineralization component—doped Gd—was removed. 3+Yb 3+ After removing NaCeF4, the mineralization effect was significantly reduced, and the free calcium oxide content was significantly higher than that in Example 4, but slightly lower than that in the blank sample. This is because the grinding aid component makes the raw SiO2 particles finer and accelerates the reaction with CaO. This indicates that the grinding aid component has a certain effect on improving the quality of clinker, but it is limited and far less significant than the effect of the mineralization component. The above results show that the components in the multifunctional composite additive provided by the present invention work together to improve the clinker firing quality.

[0064] In summary, the multifunctional composite admixture of the present invention can reduce the free calcium oxide content in cement clinker by adjusting the formulation ratio, with the main purpose of improving the clinker firing quality. At the same time, it also has the additional functions of grinding aid and energy saving, reducing energy consumption. It has application potential and use value in the cement production industry.

Claims

1. A multifunctional composite admixture for improving the quality of clinker burning, characterized in that, The multifunctional composite admixture for improving clinker sintering quality comprises the following raw materials in percentage by mass: 5-30% of grinding aid component, 5-20% of decomposition promoting component, 5-30% of inorganic mineralization component, and the rest is deionized water; The grinding aid component is a mixture of Tween surfactant, dodecyl trimethyl ammonium chloride and fulvic acid in a mass ratio of 20-25:15-20:10-20. The decomposition promoting component comprises zinc dihydrogen phosphate, potassium bromide, magnesium fluosilicate and dihydrate potassium fluoride. The inorganic mineralizing component includes NaCeF4doped with Gd 3+ , Yb 3+ .

2. The multifunctional composite admixture for improving the quality of clinker burning according to claim 1, characterized in that, The grinding aid component is a mixture of Tween surfactant, dodecyl trimethyl ammonium chloride and fulvic acid in a mass ratio of 20-25:15-20:10-20.

3. The multifunctional composite admixture for improving the quality of clinker burning according to claim 1 or 2, characterized in that, The surfactant is one or more of Tween 40, Tween 60 and Tween 80.

4. The multifunctional composite admixture for improving the quality of clinker burning according to claim 1, characterized in that, The decomposition promoting component is a mixture of zinc dihydrogen phosphate, potassium bromide, magnesium fluosilicate and dihydrate potassium fluoride in a mass ratio of 1-3:2-4:3-6:1-3.

5. The multifunctional composite admixture for improving the quality of clinker burning according to claim 1, characterized in that, The inorganic mineralized component is NaCeF4 doped with Gd 3+ , Yb 3+ , which is obtained by the following steps: taking 0.5 mol of GdCl3·6H2O, 0.5 mol of CeCl3·6H2O, and 0.5 mol of YbCl3·6H2O respectively, weighing 0.3 mol of solid NaOH, sequentially adding 0.5 mol of oleic acid (OA), 0.5 mol of oleylamine (OM), and 0.5 mol of anhydrous ethanol, and then adding to 30% of deionized water in total mass under continuous stirring for 30 min to obtain a clear solution; dissolving 1 mol of NH4F in 150 mL of deionized water to obtain a mixed solution, and dropping the obtained clear solution into the mixed solution drop by drop under stirring for 30 min; transferring the prepared suspension into a reaction kettle, and reacting at 190℃ for 10 h to obtain NaCeF4 doped with Gd 3+ , Yb 3+ .

6. A method of producing a multifunctional composite admixture for improving the quality of clinker burning according to any one of claims 1 to 5, characterized in that, The preparation method is specifically as follows: mixing the formula amount of each raw material with the formula amount of deionized water to obtain the multifunctional composite admixture for improving clinker sintering quality.

7. Use of the multifunctional composite admixture for improving the quality of clinker burning according to any one of claims 1 to 5, characterized in that, The multifunctional composite admixture for improving clinker sintering quality is used for cement.