Method for detecting contents of CaO, SiO2 and total Al in slag pressing agent containing elemental aluminum

Abstract

The invention belongs to the technical field of analysis and detection, and relates to a method for detecting the content of CaO, SiO2 and total Al in a slag pressing agent containing elemental aluminum. Comprising the following steps: S1, crushing a sample, uniformly mixing the sample, raising the temperature of a high-temperature furnace to 850 DEG C, and setting X fluorescence parameters; s2, pre-oxidizing the sample: putting a to-be-detected slag pressing agent sample containing elemental aluminum into a platinum gold crucible with a wall hung by using a mixed flux of lithium tetraborate and lithium metaborate; weighing lithium carbonate; uniformly mixing, and pre-oxidizing in a high-temperature furnace at 850 DEG C; s3, sample melting: taking out the pre-oxidized sheet and placing the pre-oxidized sheet in a 1050 DEG C sample melting furnace; melting is conducted for 15 min; performing mold reversing and sheet forming; s4, X fluorescence detection: putting the fuse piece sample into a spectrograph for detection, and giving a sample result; s5, sample detection is finished, whether a detection result between the parallel samples exceeds an allowable error range or not is judged, and an average result is calculated. The method solves the problem that X-fluorescence spectrum fuse piece analysis cannot be realized at present.

Description

Technical Field

[0001] This invention belongs to the field of analytical testing technology, and relates to a method for detecting the content of CaO, SiO2 and total Al in a slag-forming agent containing elemental aluminum. Background Technology

[0002] Slag suppressant is an important auxiliary material used in the metallurgical industry to control the fluidity and stability of slag. It is mainly used in smelting processes such as converters and electric furnaces, and can effectively suppress slag overflow and splashing, and reduce the residual oxygen content in molten steel.

[0003] Currently, there are no reports on methods for analyzing the content of calcium oxide, silica, and total aluminum in slag-pressing agents containing elemental aluminum using X-ray fluorescence spectroscopy. Only methods exist for determining the content of calcium oxide, silica, and total aluminum in related fields such as aluminum slag, high-alumina slow-release deoxidizers, AD powder, slag conditioners, and modifiers. Examples include EDTA complexometric titration or ICP for determining the content of calcium oxide and total aluminum in aluminum slag, and gravimetric determination of silica content in aluminum slag. These methods have drawbacks such as long analysis times and the need for separate analysis of each component. In contrast, wavelength dispersive X-ray fluorescence spectroscopy, due to its relatively simple sample preparation, lack of need for hazardous chemical reagents such as acids and alkalis, ability to simultaneously determine multiple components, and good precision and accuracy, is increasingly being accepted by analytical workers. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for detecting the content of CaO, SiO2, and total Al in slag-forming agents containing elemental aluminum. This method solves the problem of detecting the content of calcium oxide, silica, and total aluminum in aluminum slag containing elemental aluminum. By employing a pre-oxidation melting method, it overcomes the challenge of damaging the platinum-gold crucible used for melting samples containing elemental aluminum in slag-forming agents, thus preventing X-ray fluorescence spectrometry analysis. This instrumentalizes the previously required gravimetric determination of silica and titration methods for determining calcium oxide and total aluminum content, reducing analysis time and saving significant manpower and resources.

[0005] The technical solution adopted in this invention is a method for detecting the content of CaO, SiO2, and total Al in a slag-pressing agent containing elemental aluminum, characterized by comprising the following steps:

[0006] S1: After crushing and mixing the slag agent sample containing elemental aluminum, heat the high-temperature furnace to 850℃ and set the analytical parameters of the X-ray fluorescence spectrometer.

[0007] S2: Weigh 6.0000±0.0002g of lithium tetraborate and lithium metaborate mixed flux into a platinum-gold crucible. Open the furnace lid, use a special crucible tong to hold the crucibles and place them in order on the crucible rack, then close the furnace lid. When the furnace temperature reaches above 1050℃, turn on the swing switch and remove them one by one after 5 minutes. Then weigh 1.5000±0.0002g of lithium carbonate and pour it evenly into the platinum-gold crucible that has been coated. Weigh the slag-pressing agent sample obtained after S1 and spread it evenly on the lithium carbonate and mix it with the lithium carbonate. Then use a tool to brush the sample on the plastic rod into the crucible. Weigh 2.0000±0.0002g of lithium tetraborate and lithium metaborate mixed flux into the crucible and cover the sample. Place the crucible into a porcelain crucible and put it into an 850℃ muffle furnace for pre-oxidation for 30 minutes. Remove and cool.

[0008] S3: Add 0.5 mL of lithium nitrate + lithium bromide mixed solution to the crucible after S2 pre-oxidation treatment, then put the crucible into a melting furnace with a furnace temperature of 1050℃, melt for 15 min, pour the sample into the mold, and after the sample cools for 4 minutes, demold to obtain the molten sheet sample. Put the obtained molten sheet sample into a sample bag, write the label, and put it into a desiccator for testing.

[0009] S4: Place the fused sheet sample into a spectrometer for detection and provide the sample results;

[0010] S5: After the sample testing is completed, determine whether the test results between parallel samples exceed the allowable error range. If they do not exceed the tolerance, take the average value and report the analysis results; if they exceed the tolerance, repeat the steps S1 to S3 to prepare samples and conduct tests again.

[0011] Furthermore, in step S1, the slag sample containing elemental aluminum to be tested is crushed to below 0.125 mm.

[0012] Furthermore, the specific analytical parameters of the X-ray fluorescence spectrometer set in S1 are as follows: the X-ray fluorescence spectrometer selects the Ka spectral lines of calcium, silicon, and aluminum as analytical lines, selects the 2θ angle corresponding to the spectral lines of the analytical elements, sets the X-ray fluorescence tube voltage in the range of 30 to 60 kV, and sets the tube current in the range of 40 to 80 mA.

[0013] Furthermore, the mass ratio of lithium tetraborate to lithium metaborate in the lithium tetraborate and lithium metaborate mixed flux is 67:33.

[0014] Furthermore, the amount of slag-pressing agent sample weighed in S2 after being crushed in S1 is 0.3000±0.0002g.

[0015] The beneficial effects of this invention are: by using the pre-oxidation melting method, the problem of converting aluminum slag samples containing elemental aluminum into molten sheets without losing the platinum crucible is overcome, thereby enabling the determination of calcium oxide, silicon dioxide, and total aluminum content in aluminum slag by X-ray fluorescence spectrometry. This instrumentalizes the detection techniques that previously required gravimetric determination of silicon dioxide and titration determination of calcium oxide and total aluminum content, shortening the analysis time and saving a lot of manpower and resources. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a flowchart of the method provided by the present invention. Detailed Implementation

[0018] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0019] like Figure 1 As shown, this invention provides a method for detecting the CaO, SiO2, and total Al content in a slag-pressing agent containing elemental aluminum, comprising the following steps:

[0020] S1: Preparation before analysis: After crushing the slag agent sample containing elemental aluminum to be tested, grind it on a vibratory mill, pass it through a 0.125mm sieve, mix it evenly, heat the high-temperature furnace to 850℃, and set the analytical parameters of the X-ray fluorescence spectrometer.

[0021] Specifically, the X-ray fluorescence spectrometer selects the Ka spectral lines of calcium, silicon, and aluminum as analytical lines, selects the 2θ angle corresponding to the spectral lines of the analytical elements, and sets the X-ray fluorescence tube voltage in the range of 30–60 kV and the tube current in the range of 40–80 mA.

[0022] S2: Weigh 6.0000±0.0002g of the mixed flux of lithium tetraborate and lithium metaborate into a platinum-gold crucible. Open the furnace lid, use a crucible clamp for melting to hold the crucibles and place them in order on the crucible rack, then close the furnace lid. When the furnace temperature reaches above 1050℃, turn on the swing switch and remove them one by one after 5 minutes. Then weigh 1.5000±0.0002g of lithium carbonate and pour it evenly into the platinum-gold crucible that has been coated. Weigh 0.3000±0.0002g of the slag-pressing agent sample obtained after S1 and spread it evenly on the lithium carbonate. Use a plastic rod to mix the sample with the lithium carbonate, and then use a brush to brush the sample on the plastic rod into the crucible. Weigh 2.0000±0.0002g of the mixed flux of lithium tetraborate and lithium metaborate into the crucible and cover the sample. Place the crucible into a porcelain crucible and put it into an 850℃ muffle furnace for pre-oxidation for 30 minutes. Remove and cool.

[0023] Specifically, the mass ratio of lithium tetraborate to lithium metaborate in the lithium tetraborate and lithium metaborate mixed flux is 67:33.

[0024] S3: Add 0.5 mL of lithium nitrate + lithium bromide mixed solution to the pre-oxidized crucible, then place the crucible into a melting furnace at a temperature of 1050℃. After the gas has evaporated, send the clean platinum gold mold into the furnace. When the furnace temperature reaches 1050℃, start shaking and start timing. After melting for 15 minutes, pour the sample into the mold. After the sample cools for 4 minutes, demold to obtain the fused sheet sample, put the fused sheet sample into a sample bag, write a label, and put it into a desiccator for testing.

[0025] S4: Place the fused sheet sample into a spectrometer for detection and provide the sample results.

[0026] Specifically, a series of homogeneous standards containing calcium oxide, silicon dioxide, and aluminum are used. Samples are prepared and working parameters are set according to steps S1 to S3. The characteristic X-ray intensities of the elements are measured on an X-ray fluorescence spectrometer. After background and matrix correction, working curves of characteristic X-ray fluorescence intensity versus content for each element are generated. The instrument drift correction sample is also detected and set synchronously with the standard or control sample using a pre-oxidation melting method, thereby establishing the final analysis program and drift correction program. Before analyzing the sample, the spectrometer is first drift-corrected using the drift correction sample. After drift correction, the standard or control sample is used for verification analysis to determine whether the drift correction is in place and whether further adjustments are needed. After the drift correction or adjustment is in place, the sample is placed in the spectrometer for detection, and the sample results are given.

[0027] S5: After the sample testing is completed, determine whether the test results between parallel samples exceed the allowable error range. If they do not exceed the tolerance, take the average value and report the analysis result; if they exceed the tolerance, repeat steps S1 to S3 to prepare samples and perform the tests again.

[0028] The following examples provide further details.

[0029] Example 1:

[0030] Step 1: Preparation before analysis. After crushing the slag-pressing agent containing elemental aluminum, pass it through a 0.125mm sieve. Heat the high-temperature furnace to 850℃. Set the X-ray fluorescence according to Table 1.

[0031] Table 1 analyzes the analysis line, recommended spectrophotometer, 2θ angle, phototube voltage and current, and possible interfering elements.

[0032]

[0033] Step 2: Sample pre-oxidation

[0034] Weigh 6.0000g ± 0.0002g of a mixed flux of lithium tetraborate and lithium metaborate into a platinum-gold crucible. Open the furnace lid, use crucible tongs (specifically for melting) to hold the crucibles and place them sequentially on the crucible rack. Close the furnace lid. Once the furnace temperature reaches above 1050℃, turn on the rocking switch and start timing. After 5 minutes, remove the crucibles one by one, rotating them to form a protective film of flux on the inner wall. Weigh 1.5000 ± 0.0002g of lithium carbonate and pour it evenly into the crucible. Place 0.3000±0.0002g of sample into the platinum-gold crucible that has already been coated on the walls. Spread the sample evenly on the lithium carbonate and mix it with the lithium carbonate using a plastic rod. Use a brush to transfer the sample from the plastic rod into the crucible. Then, weigh 2.0000±0.0002g of a mixed flux of lithium tetraborate and lithium metaborate and pour it into the crucible to cover the sample. Place the crucible into a porcelain crucible and pre-oxidize it in a muffle furnace at 850℃ for 30 minutes. Remove and cool.

[0035] Step 3: Sample melting

[0036] Add 0.5 mL of lithium nitrate + lithium bromide mixed solution to the pre-oxidized crucible, then place the crucible into a melting furnace at a temperature of 1050℃. After the gas has evaporated, send the clean platinum gold mold into the furnace. When the furnace temperature reaches 1050℃, start shaking and start timing. After melting for 15 minutes, pour the sample into the mold. After the sample cools for 4 minutes, demold to obtain the fused sheet sample, put the fused sheet sample into a sample bag, write a label, and put it into a desiccator for testing.

[0037] Step 4: X-ray fluorescence detection

[0038] Using a series of homogeneous standards containing calcium oxide, silicon dioxide, and aluminum, samples were prepared and working parameters were set according to steps (1) to (3). The characteristic X-ray intensities of the elements were measured on an X-ray fluorescence spectrometer. After background and matrix correction, working curves of characteristic X-ray fluorescence intensity-content for each element were produced. The instrument drift correction sample was also detected and set synchronously with the standard or control sample using a pre-oxidation melting method, thereby establishing the final analysis procedure and drift correction procedure. Before analyzing the sample, the spectrometer was first drift-corrected using the drift correction sample. After drift correction, the standard or control sample was used for verification analysis to determine whether the drift correction was in place and whether further adjustments were needed. After the drift correction or adjustment was in place, the sample was placed in the spectrometer for detection to obtain the detection results.

[0039] Step 5: Report the analysis results

[0040] After the sample testing is completed, determine whether the test results between parallel samples exceed the allowable error range. If they do not exceed the tolerance, take the average value and report the analysis result; if they exceed the tolerance, repeat steps 1 to 3 to prepare samples and conduct tests again.

[0041] If the parallel analysis results are still out of tolerance after sample preparation and analysis, the homogeneity of the sample and whether the sample was contaminated during the sample preparation process should be investigated and analyzed.

[0042] The method described in this example was used to test eight samples of slag-pressing agent containing elemental aluminum used in a steel plant. The results were compared with those obtained by chemical methods. The test results are shown in Table 2.

[0043] Table 2. Chemical and fluorescence results for the determination of calcium oxide, silicon dioxide, and total aluminum content in slag additives containing elemental aluminum.

[0044]

[0045]

[0046] As shown in Table 2, the results of the chemical analysis method and the X-ray fluorescence spectrometry method are consistent, which indicates that the accuracy of the method of the present invention in determining the aluminum content in the slag agent containing metallic iron can meet the analytical requirements.

[0047] Example 2:

[0048] Step 1: Preparation before analysis

[0049] After crushing the slag-pressing agent containing elemental aluminum, it is sieved through a 0.125mm sieve. The high-temperature furnace is heated to 850℃, and X-ray fluorescence is set according to Table 3.

[0050] Table 3 analyzes the analysis line, recommended spectrophotometer, 2θ angle, phototube voltage and current, and possible interfering elements.

[0051] 1 Ca CaKa1,2 PET 113.09 50 50 12 — 2 Si SiKa1,2 LiF200 109.02 50 50 12 — 3 Al AlKa1,2 PET 144.71 50 50 12 —

[0052] Step 2: Sample pre-oxidation

[0053] Weigh 6.0000±0.0002g of a mixture of lithium tetraborate and lithium metaborate flux into a platinum-gold crucible. Open the furnace lid, use crucible tongs (specifically for melting) to hold the crucibles and place them sequentially on the crucible rack. Close the furnace lid. Once the furnace temperature reaches above 1050℃, turn on the rocking switch and start timing. After 5 minutes, remove the crucibles one by one, rotating them to form a protective film of flux on the inner wall. Weigh 1.5000±0.0002g of lithium carbonate and pour it evenly into the crucible. In the platinum-gold crucible that has already been coated, weigh 0.3000±0.0002g of sample and spread it evenly on the lithium carbonate. Use a plastic rod to mix the sample with the lithium carbonate. Use a brush to transfer the sample from the plastic rod into the crucible. Then weigh 2.0000±0.0002g of a mixed flux of lithium tetraborate and lithium metaborate and pour it into the crucible to cover the sample. Place the crucible in a porcelain crucible and pre-oxidize it in a muffle furnace at 850℃ for 30 minutes. Remove and cool.

[0054] Step 3: Sample melting

[0055] Add 0.5 mL of lithium nitrate + lithium bromide mixed solution to the pre-oxidized crucible, then place the crucible into a melting furnace at a temperature of 1050℃. After the gas has evaporated, send the clean platinum gold mold into the furnace. When the furnace temperature reaches 1050℃, start shaking and start timing. After melting for 15 minutes, pour the sample into the mold. After the sample cools for 4 minutes, demold to obtain the fused sheet sample, put the fused sheet sample into a sample bag, write a label, and put it into a desiccator for testing.

[0056] Step 4: X-ray fluorescence detection

[0057] Using a series of homogeneous standards containing calcium oxide, silicon dioxide, and aluminum, samples were prepared and working parameters were set according to steps (1) to (3). The characteristic X-ray intensities of the elements were measured on an X-ray fluorescence spectrometer. After background and matrix correction, working curves of characteristic X-ray fluorescence intensity-content for each element were produced. The instrument drift correction sample was also detected and set synchronously with the standard or control sample using a pre-oxidation melting method, thereby establishing the final analysis procedure and drift correction procedure. Before analyzing the sample, the spectrometer was first drift-corrected using the drift correction sample. After drift correction, the standard or control sample was used for verification analysis to determine whether the drift correction was in place and whether further adjustments were needed. After the drift correction or adjustment was in place, the sample was placed in the spectrometer for detection, and the detection results were obtained.

[0058] Step 5: Report the analysis results

[0059] After the sample testing is completed, determine whether the test results between parallel samples exceed the allowable error range. If they do not exceed the tolerance, take the average value and report the analysis result; if they exceed the tolerance, repeat steps 1 to 3 to prepare samples and conduct tests again.

[0060] If the parallel analysis results are still out of tolerance after sample preparation and analysis, the homogeneity of the sample and whether the sample was contaminated during the sample preparation process should be investigated and analyzed.

[0061] Using the method described in this example, eleven measurements were performed on samples 1 and 2 of a slag-pressing agent containing elemental aluminum used in a steel plant. The results are shown in Table 4.

[0062] Table 4. Results of eleven determinations of calcium oxide, silicon dioxide, and total aluminum content in aluminum-containing slag-forming agents.

[0063]

[0064]

[0065] As shown in Table 4, the precision of the method of the present invention is comparable to that of the chemical method for determining the content of calcium oxide, silicon dioxide and total aluminum in aluminum-containing slag agents, indicating that the precision of the method of the present invention can meet the analytical requirements.

[0066] Comparative example:

[0067] Experiments were conducted using the same sample under different temperature and time conditions.

[0068] Step 1: Preparation before analysis

[0069] After crushing the slag-pressing agent containing elemental aluminum, it is sieved through a 0.125mm sieve. The high-temperature furnace is heated to 850℃, and X-ray fluorescence is set according to Table 3.

[0070] Step 2: Sample pre-oxidation

[0071] Take ten platinum-gold crucibles, and weigh 6.0000±0.0002g of a mixture of lithium tetraborate and lithium metaborate flux into each crucible. Open the furnace lid, use crucible tongs for melting to hold the crucibles and place them in order on the crucible rack. Close the furnace lid. When the furnace temperature reaches above 1050℃, turn on the swing switch and start timing. After 5 minutes, remove each crucible one by one, rotating it to form a protective film on the inner wall of the crucible. Weigh 1.5000±0.0002g of lithium carbonate and pour it evenly into the platinum-gold crucible that has been coated on the wall. In a gold crucible, weigh 0.3000±0.0002g of sample and evenly spread it on lithium carbonate. Use a plastic rod to mix the sample with the lithium carbonate. Use a brush to transfer the sample from the plastic rod into the crucible. Then weigh 2.0000±0.0002g of a mixed flux of lithium tetraborate and lithium metaborate and pour it into the crucible, covering the sample. Place the crucible into a porcelain crucible. Place five crucibles in muffle furnaces at 700℃, 750℃, 800℃, 850℃, and 900℃ respectively for pre-oxidation for 30min, then remove and cool. Place the remaining five crucibles in a muffle furnace at 850℃ for pre-oxidation for 15min, 20min, 25min, 30min, and 35min respectively, then remove and cool.

[0072] Step 3: Sample melting

[0073] Add 0.5 mL of lithium nitrate + lithium bromide mixed solution to the pre-oxidized crucible, then place the crucible into a melting furnace at a temperature of 1050℃. After the gas has evaporated, send the clean platinum gold mold into the furnace. When the furnace temperature reaches 1050℃, start shaking and start timing. After melting for 15 minutes, pour the sample into the mold. After the sample cools for 4 minutes, demold to obtain the fused sheet sample, put the fused sheet sample into a sample bag, write a label, and put it into a desiccator for testing.

[0074] Step 4: X-ray fluorescence detection

[0075] Using a series of homogeneous standards containing calcium oxide, silicon dioxide, and aluminum, samples were prepared and working parameters were set according to steps (1) to (3). The characteristic X-ray intensities of the elements were measured on an X-ray fluorescence spectrometer. After background and matrix correction, working curves of characteristic X-ray fluorescence intensity-content for each element were produced. The instrument drift correction sample was also detected and set synchronously with the standard or control sample using a pre-oxidation melting method, thereby establishing the final analysis procedure and drift correction procedure. Before analyzing the sample, the spectrometer was first drift-corrected using the drift correction sample. After drift correction, the standard or control sample was used for verification analysis to determine whether the drift correction was in place and whether further adjustments were needed. After the drift correction or adjustment was in place, the sample was placed in the spectrometer for detection to obtain the detection results.

[0076] Step 5: Report the analysis results

[0077] After the sample testing is completed, determine whether the test results between parallel samples exceed the allowable error range. If they do not exceed the tolerance, take the average value and report the analysis result; if they exceed the tolerance, repeat steps 1 to 3 to prepare samples and conduct tests again.

[0078] If the parallel analysis results are still out of tolerance after sample preparation and analysis, the homogeneity of the sample and whether the sample was contaminated during the sample preparation process should be investigated and analyzed.

[0079] Using the method described in this example, ten parallel samples of slag-pressing agent containing elemental aluminum used in a steel plant were tested for two pre-oxidation conditions: temperature and time. The test results are shown in Table 5.

[0080] Table 5 Comparison of Temperature and Time Conditions for Calcium Oxide, Silica, and Total Aluminum Content in Aluminum-Containing Slag-Removing Agents

[0081]

[0082]

[0083] As shown in Table 5, the pre-oxidation stage can only meet the analytical requirements by using a temperature greater than 850℃ and a pre-oxidation time greater than 30 minutes. However, considering energy conservation, a pre-oxidation time of 850℃ for 30 minutes is sufficient.

[0084] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present technical solution are within the protection scope of the present invention.

[0085] To facilitate understanding by those skilled in the art of the improvements of this invention over the prior art, some of the accompanying drawings and descriptions have been simplified, and for clarity, some other elements have been omitted from this application. Those skilled in the art should realize that these omitted elements may also constitute the content of this invention.

Claims

1. A method for detecting the content of CaO, SiO2, and total Al in a slag-pressing agent containing elemental aluminum, characterized in that, Includes the following steps: S1: After crushing and mixing the slag agent sample containing elemental aluminum, heat the high-temperature furnace to 850℃ and set the analytical parameters of the X-ray fluorescence spectrometer. S2: Weigh 6.0000±0.0002g of lithium tetraborate and lithium metaborate mixed flux into a platinum-gold crucible. Open the furnace lid, use a special crucible tong to hold the crucibles and place them in order on the crucible rack, then close the furnace lid. When the furnace temperature reaches above 1050℃, turn on the swing switch and remove them one by one after 5 minutes. Then weigh 1.5000±0.0002g of lithium carbonate and pour it evenly into the platinum-gold crucible that has been coated. Weigh the slag-pressing agent sample obtained after S1 and spread it evenly on the lithium carbonate and mix it with the lithium carbonate. Then use a tool to brush the sample on the plastic rod into the crucible. Weigh 2.0000±0.0002g of lithium tetraborate and lithium metaborate mixed flux into the crucible and cover the sample. Place the crucible into a porcelain crucible and put it into an 850℃ muffle furnace for pre-oxidation for 30 minutes. Remove and cool. S3: Add 0.5 mL of lithium nitrate + lithium bromide mixed solution to the crucible after S2 pre-oxidation treatment, then put the crucible into a melting furnace with a furnace temperature of 1050℃, melt for 15 min, pour the sample into the mold, and after the sample cools for 4 minutes, demold to obtain the molten sheet sample. Put the obtained molten sheet sample into a sample bag, write the label, and put it into a desiccator for testing. S4: Place the fused sheet sample into a spectrometer for detection and provide the sample results; S5: After the sample testing is completed, determine whether the test results between parallel samples exceed the allowable error range. If they do not exceed the tolerance, take the average value and report the analysis results; if they exceed the tolerance, repeat the steps S1 to S3 to prepare samples and conduct tests again.

2. The method for detecting the content of CaO, SiO2 and total Al in a slag-forming agent containing elemental aluminum as described in claim 1, characterized in that, In step S1, the slag sample containing elemental aluminum to be tested is crushed to below 0.125 mm.

3. The method for detecting the content of CaO, SiO2, and total Al in a slag-forming agent containing elemental aluminum as described in claim 2, characterized in that, The specific analytical parameters of the X-ray fluorescence spectrometer set in S1 are as follows: the X-ray fluorescence spectrometer selects the Ka spectral lines of calcium, silicon and aluminum as analytical lines, selects the 2θ angle corresponding to the spectral lines of the analytical elements, sets the X-ray fluorescence tube voltage in the range of 30 to 60 kV, and sets the tube current in the range of 40 to 80 mA.

4. The method for detecting the content of CaO, SiO2 and total Al in a slag-forming agent containing elemental aluminum as described in claim 1, characterized in that, The mass ratio of lithium tetraborate to lithium metaborate in the lithium tetraborate and lithium metaborate mixed flux is 67:

33.

5. The method for detecting the content of CaO, SiO2 and total Al in a slag-forming agent containing elemental aluminum as described in claim 1, characterized in that, The amount of slag-pressing agent sample weighed in S2 after being crushed in S1 is 0.3000±0.0002g.

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