Fluorescence analysis method for rapidly determining content of aluminum oxide in high-alumina cement

Abstract

The invention relates to the technical field of detection and analysis, in particular to a fluorescence analysis method for rapidly determining the content of aluminum oxide in high-alumina cement. The method comprises the following steps: S1, selecting a plurality of calibration samples containing different contents of aluminum oxide, adding a fluxing agent and a release agent into each calibration sample, and uniformly mixing to obtain a plurality of mixtures; s2, melting the plurality of mixtures to obtain a plurality of standard sample wafers; s3, detecting the fluorescence intensity of the plurality of standard sample sheets, and drawing a calibration work curve according to the content of aluminum oxide in the standard sample sheets and the corresponding fluorescence intensity; and S4, detecting the fluorescence intensity of the to-be-calibrated high-alumina cement, and finding the corresponding aluminum oxide content in the standard working curve according to the measured fluorescence intensity, thereby realizing the calibration of the high-alumina cement. The technical problems that in the prior art, when the aluminate cement is calibrated through a wet chemical analysis method, operation is tedious, consumed time is long, and the requirement for rapidly calibrating the aluminate cement cannot be met are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of detection and analysis technology, and in particular to a rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement. Background Technology

[0002] High-alumina cement is a hydraulic cementitious material made from clinker with calcium aluminate as the main component and an alumina content of about 50% through calcination and grinding. It is also known as refractory cement or aluminate cement. It has the characteristics of rapid hardening, high strength, heat resistance, corrosion resistance and concentrated heat release during hydration. It has high early strength and strong resistance to sulfate attack. It is suitable for refractory casting, high-temperature equipment and chemical engineering.

[0003] Currently, cement standards are all ordinary Portland cement standards, where the aluminum oxide content ranges only from 4.46% to 6.96%. Aluminate cement standards only have an aluminum oxide content of 51.41%, which is insufficient to establish an instrumental calibration curve for the aluminum oxide content in aluminate cement. Therefore, it is necessary to measure the signal values ​​of multiple standards with different known contents, and then plot the "content" on the horizontal axis and the "signal value" on the vertical axis. This line is the calibration curve. When testing unknown cement samples subsequently, the instrument can calculate the actual aluminum oxide content from the curve by measuring the signal value.

[0004] In existing technologies, wet chemical analysis is commonly used to determine the alumina content in cement. The core of this method involves sample dissolution, separation / masking of interfering ions, and quantitative titration. When dissolving the sample, a certain mass of high-alumina cement sample is weighed and digested with a mixture of hydrochloric acid and nitric acid under heat, or completely dissolved into a clear solution using a sodium hydroxide melting method. Then, ammonium chloride is added to the solution, and the mixture is heated to near dryness. The residue is then dissolved with hydrochloric acid, and the resulting silica precipitate is removed by filtration to prevent its adsorption of Al. 3+ Or interference titration. When separating / masking interfering ions, Fe is masked with sulfosalicylic acid. 3+ At pH 2-3, it forms a stable complex and does not react with EDTA; Ti is masked with mandelic acid. 4+ This generates poorly complexable compounds, ensuring that only Al... 3+ It participates in subsequent reactions. During quantitative titration, an acetate-sodium acetate buffer solution is added to the purified solution to control the pH value at 5.0-6.0. Under these conditions, Al 3+ The solution is stable in complexation with EDTA and exhibits a sharp color change with the indicator. Then, excess EDTA standard solution is added, boiled, and cooled. Next, xylenol orange indicator is added, at which point the solution turns yellow. The excess EDTA is then titrated with zinc standard solution; the endpoint is reached when the solution changes from yellow to purplish-red. Al is calculated based on the concentrations and volumes of EDTA and zinc standard solutions used. 3+The amount is then converted into the content of Al2O3.

[0005] It can be seen that although wet chemical analysis can determine the content of aluminum oxide in cement and thus calibrate aluminate cement, the method is cumbersome, time-consuming, and requires high skill from operators. Operators need to strictly control conditions such as pH and temperature, and it also consumes a lot of testing reagents, resulting in high costs. Therefore, it cannot meet the needs of rapid calibration of aluminate cement. Summary of the Invention

[0006] This invention provides a rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement, thereby solving the technical problem that the existing wet chemical analysis method for calibrating aluminate cement is cumbersome, time-consuming, and cannot meet the need for rapid calibration of aluminate cement.

[0007] To address the above problems, the present invention provides a rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement, employing the following technical solution: A rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement includes the following steps: S1: Select multiple calibration samples containing different amounts of aluminum oxide, add flux and release agent to each calibration sample and mix them evenly to obtain multiple mixtures; S2: Melt multiple mixtures to obtain multiple standard samples; S3: Detect the fluorescence intensity of multiple standard samples, plot the calibration curve based on the aluminum oxide content in the standard samples and its corresponding fluorescence intensity, and obtain x=(0.5y+0.08) / 100 by fitting the standard curve, where x refers to the percentage content of aluminum oxide in the sample and y refers to the fluorescence intensity. S4: Detect the fluorescence intensity of the high-alumina cement to be calibrated. Based on the measured fluorescence intensity, find the corresponding aluminum oxide content in the standard working curve to achieve the calibration of the high-alumina cement.

[0008] The beneficial effects of the fluorescence analysis method for rapid determination of aluminum oxide content in high-alumina cement provided by this invention are: 1. Cement is calibrated by determining the alumina content in cement using fluorescence analysis. Before the initial measurement, multiple calibration samples with varying alumina contents are selected, mixed thoroughly with flux and release agent, and melted to form standard samples. The fluorescence intensity of each standard sample is then measured using fluorescence analysis. A calibration curve is plotted by combining the alumina content in the standard samples with their corresponding fluorescence intensities. Subsequent calibration of high-alumina cement only requires measuring the fluorescence intensity of the cement to be calibrated, which can then be substituted into the formula obtained from the standard curve fitting to determine the corresponding alumina content. Compared to wet chemical analysis, this method eliminates the complex preparation of chemical reagents, multiple chemical reactions, and cumbersome separation, washing, and titration steps, greatly simplifying the operation process.

[0009] 2. The entire fluorescence analysis process mainly involves sample mixing, melting, fluorescence intensity detection, and curve comparison. Unlike wet chemical analysis, it does not require lengthy chemical reaction processes and multiple waiting times. From preparing standard samples to finally determining the alumina content in high-alumina cement, the process can be completed in a shorter time, significantly reducing the detection time and thus meeting the need for rapid calibration of aluminate cement.

[0010] In summary, this invention effectively solves the technical problem that the existing wet chemical analysis method for calibrating aluminate cement is cumbersome, time-consuming, and cannot meet the need for rapid calibration of aluminate cement.

[0011] Furthermore, in step S1, the aluminum oxide content in the multiple calibration samples ranged from 4.46% to 54.41%.

[0012] Furthermore, in step S1, the flux is a mixed flux comprising anhydrous lithium tetraborate and lithium metaborate.

[0013] Beneficial effects: High-alumina cement has a high aluminum oxide content and contains refractory components such as calcium silicate and calcium aluminoferrite. A single flux requires a high temperature to completely melt, which easily leads to high energy consumption and long preparation time. When anhydrous lithium tetraborate and lithium metaborate are mixed, they form a eutectic system, which significantly lowers the melting point of the mixed flux. The lower melting temperature can quickly destroy the refractory mineral structure in high-alumina cement, allowing the calibration sample and flux to fully fuse and shorten the melting time. Lithium metaborate has good fluidity, which can improve the viscosity of the mixture and avoid component agglomeration caused by high viscosity when high-alumina cement melts. Anhydrous lithium tetraborate can improve the chemical stability of calibration samples and standard samples and reduce crystal precipitation during cooling. The synergistic effect of lithium metaborate and anhydrous lithium tetraborate can prepare transparent, bubble-free, and uniformly composed standard samples, effectively eliminating mineral effects and particle size effects, making the linear correlation between fluorescence intensity and aluminum oxide content closer, thereby improving the accuracy of high-alumina cement calibration.

[0014] Furthermore, the mass ratio of anhydrous lithium tetraborate to lithium metaborate in the flux is 67:33.

[0015] Furthermore, in step S1, the mass ratio of flux to calibration sample is 5:1.

[0016] Beneficial effects: High-alumina cement calibration samples contain refractory minerals such as calcium aluminate and dicalcium silicate. If the amount of flux is insufficient, the flux cannot fully coat the sample particles and destroy the refractory crystal structure, which can easily lead to residual solid impurities after melting. If the amount of flux is too large, it will over-dilute the sample, increasing energy consumption and sample preparation time. Setting the mass ratio of flux to calibration sample to 5:1 allows the flux to completely coat the calibration sample particles, achieving complete melting without residue. This avoids fluorescence background interference caused by residual refractory impurities and can disperse aluminum oxide and impurities in the sample, eliminating component agglomeration and laying the foundation for the uniformity of subsequent fluorescence detection.

[0017] Furthermore, in step S1, the number of calibration samples is greater than or equal to 12.

[0018] Furthermore, in step S1, the release agent is ammonium iodide release agent.

[0019] Beneficial effects: The borate glass system formed by the melting of high-alumina cement and flux is prone to chemical adsorption or slight reaction with the inner wall of the container used to hold the mixture during cooling, leading to sample adhesion, cracking, or even incomplete removal. Ammonium iodide rapidly decomposes into volatile gases such as ammonia and hydrogen iodide at the melting temperature. These gases form a gas film barrier between the inner wall of the container and the molten sample, physically isolating the sample from the container surface and blocking direct contact and bonding between the two. During the melting process, the slow decomposition of ammonium iodide replenishes the gas, allowing the gas film to persist throughout the melting process, ensuring that the sample can be completely peeled off after cooling and avoiding sample re-reproduction due to sample damage. Fluorescence analysis requires high sample purity. If the release agent contains residual solid impurities or introduces additional elements, it will interfere with the characteristic fluorescence detection of aluminum. Using ammonium iodide as a release agent, the decomposition products of ammonium iodide are all gases that can be completely volatilized at high temperatures, leaving no solid residue and not introducing interfering elements. This ensures that the fluorescence detection signal comes only from aluminum oxide in the high-alumina cement, reducing the relative standard deviation of the measurement results.

[0020] Furthermore, the ammonium iodide release agent is an ammonium iodide release agent with a mass percentage concentration of 30%.

[0021] Further, in step S2, the mixture is fed into an automatic melting machine for melting, and the temperature of the automatic melting machine is 1000℃-1200℃.

[0022] Furthermore, in step S1, the calibration sample is a mixture of ordinary silicate cement standard sample and aluminate cement standard sample. Attached Figure Description

[0023] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein: Figure 1 A flowchart of the fluorescence analysis method for rapid determination of aluminum oxide content in high-alumina cement provided by the present invention; Figure 2 This is a calibration curve provided by the present invention. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] The main concept of the rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement provided by this invention is as follows: Before the initial analysis, multiple calibration samples with different aluminum oxide content gradients are prepared. Fluorescent flux and release agent are added and mixed uniformly, then melted to prepare standard samples. Subsequently, the fluorescence intensity of each standard sample is measured using fluorescence analysis. A calibration curve is established based on the aluminum oxide content and corresponding fluorescence intensity in the standard samples. The standard curve is fitted to obtain x = (0.5y + 0.08) / 100, where x refers to the percentage aluminum oxide content in the sample, and y refers to the fluorescence intensity. In the subsequent calibration of high-alumina cement, only the fluorescence intensity of the high-alumina cement to be calibrated needs to be detected. This intensity can then be substituted into the fitted formula to calculate the aluminum oxide content, thus completing the calibration.

[0026] After introducing the basic principles of the present invention, various non-limiting embodiments of the present invention are described in detail below. Any number of elements in the accompanying drawings is for illustrative purposes only and not for limitation, and any naming is for distinction only and has no limiting meaning.

[0027] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0028] Examples of the fluorescence analysis method for rapid determination of aluminum oxide content in high-alumina cement provided by this invention: like Figure 1 As shown, the rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement includes the following steps: S1: Select multiple calibration samples containing different amounts of aluminum oxide, add flux and release agent to each calibration sample and mix them evenly to obtain multiple mixtures; S2: Melt multiple mixtures to obtain multiple standard samples; S3: Detect the fluorescence intensity of multiple standard samples, plot the calibration curve based on the aluminum oxide content in the standard samples and its corresponding fluorescence intensity, and obtain x=(0.5y+0.08) / 100 by fitting the standard curve, where x refers to the percentage content of aluminum oxide in the sample and y refers to the fluorescence intensity. S4: Detect the fluorescence intensity of the high-alumina cement to be calibrated. Based on the measured fluorescence intensity, find the corresponding aluminum oxide content in the standard working curve to achieve the calibration of the high-alumina cement.

[0029] In step S1, the number of calibration samples is greater than or equal to 12, and the content of aluminum oxide in multiple calibration samples is 4.46%-54.41%; the flux is a mixed flux including anhydrous lithium tetraborate and lithium metaborate, wherein the mass ratio of anhydrous lithium tetraborate to lithium metaborate in the flux is 67:33; the mass ratio of flux to calibration samples is 5:1.

[0030] In this embodiment, 6g of a mixture of anhydrous lithium tetraborate and lithium metaborate flux was first weighed and placed in a platinum crucible; then 1.2g of calibration sample was weighed and transferred to the platinum crucible and mixed evenly with the mixed flux; then 4 drops of 30% ammonium iodide release agent were added to the platinum crucible using a 1mL dropper.

[0031] In this embodiment, the number of calibration samples is 12. Since there are currently no commercially available series of standard samples of high aluminate cement, in this embodiment, the calibration samples are a mixture of ordinary silicate cement standard samples and aluminate cement standard samples. The content of ordinary silicate cement standard samples and aluminate cement standard samples in each calibration sample, as well as the content of aluminum oxide in each calibration sample, are shown in Table 1.

[0032] In step S2, the mixture is fed into an automatic melting machine for melting, and the temperature of the automatic melting machine is 1000℃-1200℃.

[0033] In this embodiment, the temperature of the automated melting machine was set to 1050°C, and the melting time was set to 15 minutes. Twelve platinum crucibles containing mixtures with different aluminum oxide contents were placed together into the automated melting machine, and melting was performed using a one-step heating method. After the mixtures remained in the automated melting machine for 15 minutes, twelve standard samples with different aluminum oxide contents were obtained. Sample identification labels were affixed to the standard samples, and the samples were then awaiting fluorescence analysis.

[0034] Standard samples, also known as fluorescent fused sheets or glass slides, are called glass slides primarily because their preparation process and final form are highly similar to the properties of glass. The specific reasons are as follows: 1. Intuitive similarity in physical form: During the preparation process, the calibration sample (such as mineral powder, cement, etc.) is mixed with the flux (such as borate) and melted at a high temperature of 1000℃-1200℃ to form a liquid mixture; after cooling, it will solidify into a uniform, transparent or translucent sheet. Its smooth and homogeneous solid appearance is highly consistent with the physical properties of glass, namely "amorphous, homogeneous and brittle". It intuitively presents the texture of glass from both visual and tactile perspectives, and is therefore called a glass sheet.

[0035] 2. The amorphous nature of the microstructure: The core property of glass is its amorphous structure with disordered atomic arrangement. During the rapid cooling process of the fluorescent fused sheet, the molten calibration sample and flux mixture will also form the same amorphous structure. This structure is different from the ordered lattice arrangement of crystalline materials and is completely consistent with the structural characteristics of glass at the microscopic level.

[0036] 3. High degree of analogy in preparation process: The manufacturing of traditional glass relies on the process of "high temperature melting of raw materials → cooling and forming". The preparation of fluorescent flakes also follows the process logic of "high temperature melting of calibration samples and flux → cooling into thin sheets". The overlap of the two in core processes makes glass sheets a straightforward basis for their naming.

[0037] 4. Adaptability to functional requirements: In order to meet the stringent requirements of X-ray fluorescence spectroscopy (XRF) analysis for "smooth surface, uniform composition, and no bubbles or impurities", the fluorescent fused sheet needs to break the crystal structure of the sample through the "vitrification process" to form a homogeneous sheet, so as to avoid analytical errors caused by uneven calibration samples. This process makes good use of the homogeneous properties of glass, which further supports the rationality of the name "glass sheet" from a functional perspective.

[0038] After the standard samples were prepared, fluorescence analysis was performed on each standard sample. The fluorescence intensity of each standard sample was plotted based on the aluminum oxide content and the measured fluorescence intensity, as shown in the figure. Figure 2 The calibration curve shown is as follows. Figure 2In the figure, the horizontal axis represents the percentage content of aluminum oxide, and the vertical axis represents the measured fluorescence intensity of aluminum oxide, with the unit being Kcps (KiloCounts Per Second).

[0039] right Figure 2 The obtained calibration curve was fitted to obtain the relationship between the percentage content of aluminum oxide and the fluorescence intensity as: x=(0.5y+0.08) / 100, where x refers to the percentage content of aluminum oxide in the sample to be tested, and y refers to the fluorescence intensity.

[0040] Table 1

[0041] In Table 1, GSB08-2985-2013C1, GSB08-2985-2013C3~GSB08-2985-2013C6, GSB08-2985-2013C8, and GSB08-2985-2013C... 10 and GSB08-2985-2013C 11 All are cement series standard samples for X-ray fluorescence analysis; GSB08-1533 is the number of the Chinese national building materials industry standard sample, which belongs to cement composition analysis standard material. It is mainly used to calibrate analytical instruments such as X-ray fluorescence spectroscopy (XRF) or as a physical standard for quality control.

[0042] The accuracy of the calibration working curve is verified using calibration sample 7 and calibration sample 12 as examples. The accuracy test results are shown in Table 2.

[0043] According to the experimental results, the fluorescence intensity measured for calibration sample 7 was 12.925 Kcps. Substituting this into the relationship between the percentage content of aluminum oxide and fluorescence intensity, we get x = (0.5 × 12.925 + 0.08) / 100 = 6.5425% ≈ 6.54%, meaning that the percentage content of aluminum oxide in calibration sample 7 is 6.54%. The fluorescence intensity measured for calibration sample 12 was 102.442 Kcps. Substituting this into the relationship between the percentage content of aluminum oxide and fluorescence intensity, we get x = (0.5 × 102.442 + 0.08) / 100 = 51.301% ≈ 51.30%, meaning that the percentage content of aluminum oxide in calibration sample 12 is 51.30%.

[0044] Table 2

[0045] As shown in Table 2, the aluminum oxide content of calibration sample 7 obtained using the rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement provided in this application is approximately 6.54%, while the standard value for aluminum oxide content in calibration sample 7 is 6.56%, with a deviation of 0.02%, which is within the allowable deviation range of the national standard. The aluminum oxide content of calibration sample 12 obtained using the rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement provided in this application is approximately 51.30%, while the standard value for aluminum oxide content in calibration sample 7 is 51.41%, with a deviation of 0.11%, which is within the allowable deviation range of the national standard.

[0046] It is evident that the fluorescence analysis method for rapidly determining the aluminum oxide content in high-alumina cement provided in this application has high accuracy and can be used for the calibration of high-alumina cement.

[0047] In other embodiments, the temperature of the automatic melting machine is any temperature between 1000°C and 1200°C, and the melting time is determined according to the specific melting conditions to ensure that the standard sample forms a liquid mixture.

[0048] The core of the traditional wet chemical analysis method for determining the aluminum oxide content in cement is achieved through the steps of sample dissolution → separation / masking of interfering ions → quantitative titration.

[0049] When dissolving the sample, a certain mass of high-alumina cement sample should first be weighed and digested with a mixture of hydrochloric acid and nitric acid by heating, or completely dissolved into a clear solution using the sodium hydroxide melting method. Then, ammonium chloride is added to the solution, heated to near dryness, and the residue is dissolved with hydrochloric acid. The resulting silicic acid precipitate is then removed by filtration to prevent its adsorption of Al. 3+ Or it may interfere with titration.

[0050] When separating / masking interfering ions, Fe is masked using sulfosalicylic acid. 3+ At pH 2-3, it forms a stable complex and does not react with EDTA; Ti is masked with mandelic acid. 4+ This generates poorly complexable compounds, ensuring that only Al... 3+ Participate in the follow-up response.

[0051] During quantitative titration, an acetate-sodium acetate buffer solution was added to the purified solution to control the pH value at 5.0-6.0. Under these conditions, Al 3+ The solution is stable in complexation with EDTA and exhibits a sharp color change with the indicator. Then, excess EDTA standard solution is added, boiled, and cooled. Next, xylenol orange indicator is added, at which point the solution turns yellow. The excess EDTA is then titrated with zinc standard solution; the endpoint is reached when the solution changes from yellow to purplish-red. Al is calculated based on the concentrations and volumes of EDTA and zinc standard solutions used. 3+The amount is then converted into the content of Al2O3.

[0052] It is evident that although the traditional wet chemical analysis method can determine the aluminum oxide content in cement to standardize aluminate cement, the method is cumbersome, time-consuming, and requires highly skilled operators who need to strictly control conditions such as pH and temperature.

[0053] For the rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement provided in this application, X-ray fluorescence spectrometry is a non-destructive analytical technique based on the interaction between X-rays and matter. Its core principle is to achieve qualitative and quantitative analysis of elements by measuring the characteristic fluorescent X-rays produced after the substance is excited. X-ray fluorescence spectrometry can determine a wide range of elements and analyze a large concentration range. It can accurately determine macroelements and capture trace components. At the same time, this method does not require sample separation, has little interference between elements, has a simple analytical procedure, fast detection speed, and high sensitivity, and is widely used in materials, environment, metallurgy and other fields.

[0054] As can be seen, the fluorescence analysis method for rapid determination of aluminum oxide content in high-alumina cement provided in this application, compared with the traditional wet chemical analysis method, eliminates the complex preparation of chemical reagents, multi-step chemical reactions, and cumbersome separation, washing, and titration procedures, greatly simplifying the operation process. Based on the above description in this specification, those skilled in the art will also understand that the following terms, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0055] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement, characterized in that, Includes the following steps: S1: Select multiple calibration samples containing different amounts of aluminum oxide, add flux and release agent to each calibration sample and mix them evenly to obtain multiple mixtures; S2: Melt multiple mixtures to obtain multiple standard samples; S3: Detect the fluorescence intensity of multiple standard samples, plot the calibration curve based on the aluminum oxide content in the standard samples and its corresponding fluorescence intensity, and obtain x=(0.5y+0.08) / 100 by fitting the standard curve, where x refers to the percentage content of aluminum oxide in the sample and y refers to the fluorescence intensity. S4: Detect the fluorescence intensity of the high-alumina cement to be calibrated. Based on the measured fluorescence intensity, find the corresponding aluminum oxide content in the standard working curve to achieve the calibration of the high-alumina cement.

2. The rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement according to claim 1, characterized in that, In step S1, the aluminum oxide content in multiple calibration samples ranged from 4.46% to 54.41%.

3. The rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement according to claim 1 or 2, characterized in that, In step S1, the flux is a mixed flux consisting of anhydrous lithium tetraborate and lithium metaborate.

4. The rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement according to claim 3, characterized in that, The mass ratio of anhydrous lithium tetraborate to lithium metaborate in the flux is 67:

33.

5. The rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement according to claim 1 or 2, characterized in that, In step S1, the mass ratio of flux to calibration sample is 5:

1.

6. The rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement according to claim 1 or 2, characterized in that, In step S1, the number of calibration samples is greater than or equal to 12.

7. The rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement according to claim 1 or 2, characterized in that, In step S1, the release agent is ammonium iodide release agent.

8. The rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement according to claim 7, characterized in that, The ammonium iodide release agent is an ammonium iodide release agent with a mass percentage concentration of 30%.

9. The rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement according to claim 1 or 2, characterized in that, In step S2, the mixture is fed into an automatic melting machine for melting, and the temperature of the automatic melting machine is 1000℃-1200℃.

10. The rapid fluorescence analysis method for determining the aluminum oxide content in high-alumina cement according to claim 1 or 2, characterized in that, In step S1, the calibration sample is a mixture of ordinary silicate cement standard sample and aluminate cement standard sample.

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