A method for determining metallic iron content in particle steel

Abstract

The present invention belongs to the technical field of determination of metal element content in steel, and specifically relates to a method for determining the metallic iron content in particle steel. The determination method comprises: (1) melting and casting the particle steel to be measured and metallic nickel to obtain the nickel-based metal to be measured; (2) selecting a nickel-based metal standard sample with a known iron mass fraction, using a spark source atomic emission direct reading spectrometer to obtain the light intensity ratio of iron to nickel in the nickel-based metal standard sample, and establishing a standard curve of the iron mass fraction in the nickel-based metal and the light intensity ratio; (3) using the standard curve to obtain the mass fraction of iron in the nickel-based metal to be measured, and then obtaining the mass fraction of metallic iron in the particle steel to be measured. This method overcomes the problem of large segregation in the prior art when measuring the metallic iron content in particle steel, and the problem that the measured value obtained when measuring the metallic iron content is actually the total amount of metallic iron and impurities.

Description

Technical Field

[0001] The invention belongs to the technical field of determining the content of metal elements in steel, and particularly relates to a method for determining the content of metallic iron in particle steel. Background Art

[0002] In the converter steelmaking process, in addition to the main product molten steel, many by-products are also produced. Converter slag, as an important by-product in the converter steelmaking process, contains a certain amount of iron. The content of metallic iron accounts for about 5-8% of the converter slag. Recycling the metallic iron in the converter slag can not only increase the secondary utilization rate of the converter slag, reduce the cost of converter steelmaking, and improve corporate benefits, but also reduce the impact of converter slag on the environment. The recycling and utilization of converter slag has become a focus of major steel companies.

[0003] Particle steel briquettes are a common method for recycling metallic iron from converter slag. Particle steel, also known as washed steel, is made by mixing steel mill scrap slag and furnace slag with pellets obtained through crushing, ball milling, multiple magnetic separations, washing, and impurity removal. This pellets are then mixed with wood shavings and heated to 600-700°C before being extruded into a shaped pellet. Particle steel briquettes are primarily used as raw material for electric furnaces or converters, replacing scrap steel. Compared to traditional scrap steel, particle steel contains fewer impurities and produces less pollution during production. Compared to scrap steel, particle steel is easier to melt, saves electricity, and offers a more cost-effective raw material. Heating and briquetting particle steel pellets effectively increases the bulk density of steelmaking raw materials, preventing under-feeding during the steelmaking furnace. Furthermore, briquetting the pellets into the furnace eliminates the issues of flames and molten metal splashing, as well as the risk of loss after entry.

[0004] The metallic iron content in particle steel briquette not only affects the converter scrap metal yield, but also affects the converter smelting cost. When the briquette particle steel is recycled to the converter smelting, it is necessary to detect the metallic iron content in the particle steel briquette. The particle size required for chemical wet analysis is generally between 80-200 meshes or drill cuttings. Since the particle steel briquette main body is metallic iron and its oxide, it is impossible to crush and grind to this particle size or drill cuttings, resulting in the inability to accurately analyze its metallic iron content. Chinese patent literature CN111896417A discloses a detection method for iron content in briquette particle steel. Particle steel particles are weighed and put into a crucible. After melting and cooling, the steel slag on the surface of the ingot is brushed off. The ingot is then weighed. It is believed that the ingot mass obtained is recorded as metallic iron content. What the method actually measures is the total amount of metallic iron and impurities. Again, due to the use of a graphite crucible for heating and cooling, graphite carbon and impurities can be made to enter the ingot, resulting in an increase in ingot quality and larger segregation. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art in measuring the metallic iron content in particle steel, such as large segregation of test results, thereby providing a method for measuring the metallic iron content in particle steel.

[0006] To this end, the present invention provides the following technical solutions.

[0007] The present invention provides a method for determining the metallic iron content in particle steel, comprising the following steps:

[0008] (1) The particle steel to be tested and metallic nickel are melted and cast to obtain the nickel-based metal to be tested;

[0009] (2) selecting a nickel-based metal standard sample with a known iron mass fraction, obtaining a light intensity ratio of iron to nickel in the nickel-based metal standard sample using a spark source atomic emission direct reading spectrometer, and establishing a standard curve of the iron mass fraction in the nickel-based metal and the light intensity ratio;

[0010] (3) The mass fraction of iron in the nickel-based metal to be tested is obtained using the standard curve, and then the mass fraction of metallic iron in the particle steel to be tested is obtained.

[0011] The mass fraction of metallic iron in the standard sample is 5-30%.

[0012] In step (2), the standard curve is y=10.328x-0.1098, and the calibration coefficient is 0.9993;

[0013] Where y is the mass fraction of metallic iron in nickel-based metal, and x is the light intensity ratio of iron to nickel.

[0014] The nickel-based metal standard sample can be a nickel-based standard product with a known iron content, or a nickel-iron alloy made of metallic iron and metallic nickel in different proportions. It is sufficient to ensure that the mass fraction of iron in the nickel-based metal standard sample meets 5-30%, the purity of metallic iron is greater than 99.5%, the purity of metallic nickel is greater than 99.5%, the particle size is less than 10mm, and the iron content in metallic nickel is ≤0.02%.

[0015] The determination method uses the Fe273.07nm / Ni243.79nm spectral line to establish a standard curve of the iron mass fraction in the nickel-based metal and the light intensity ratio.

[0016] In the step (3), the calculation formula for the mass fraction of metallic iron in the particle steel to be measured is:

[0017]

[0018] Where m1 is the mass of the particle steel to be measured, in g;

[0019] m2 is the mass of nickel metal in g;

[0020] y is the mass fraction of metallic iron in nickel-based metals, in %.

[0021] In the step (1), the specific preparation steps of the nickel-based metal to be tested include:

[0022] The steel particles to be tested and the nickel metal are heated until they are completely melted and then kept boiling for 30-60 seconds. After the heating source is turned off, the mixture is left for 5-15 seconds, centrifugally cast, and cooled.

[0023] In the step (1), the mass ratio of the steel particles to be tested to the nickel metal is 1:(4-9);

[0024] Preferably, the mass of the steel particles to be tested is ≥5 g.

[0025] The steel particles to be tested and the nickel metal are melted in a silicon-aluminum ceramic crucible;

[0026] Preferably, the steel particles to be tested and the metal nickel are placed in the silicon-alumina ceramic crucible in such a manner that part of the metal nickel is placed at the bottom of the silicon-alumina ceramic crucible, the steel particles to be tested are placed in the middle of the ceramic crucible, and the remaining part of the metal nickel covers the steel particles to be tested.

[0027] The step (1) is carried out under vacuum or inert gas atmosphere.

[0028] The purity of the metallic nickel is greater than 99.5%, and the iron content is less than or equal to 0.02%.

[0029] The technical solution of the present invention has the following advantages:

[0030] 1. The method for determining the metallic iron content in particle steel provided by the present invention comprises the following steps: (1) melting and casting the particle steel to be measured and metallic nickel to obtain the nickel-based metal to be measured; (2) selecting a nickel-based metal standard sample with a known iron mass fraction, obtaining the light intensity ratio of iron to nickel in the nickel-based metal standard sample using a spark source atomic emission direct reading spectrometer, and establishing a standard curve of the iron mass fraction in the nickel-based metal and the light intensity ratio; (3) obtaining the mass fraction of iron in the nickel-based metal to be measured using the standard curve, and then obtaining the mass fraction of metallic iron in the particle steel to be measured. This method overcomes the problem of large segregation in the prior art when measuring the metallic iron content in particle steel, and the problem that the measured value obtained when measuring the metallic iron content is actually the total amount of metallic iron and impurities. This method establishes a standard curve of the iron mass fraction in the nickel-based metal and the light intensity ratio by fitting, and then uses the curve to obtain the metallic iron mass fraction in the particle steel to be measured, thereby improving the accuracy of the determination of the metallic iron content in the particle steel and reducing the error caused by impurities or oxidation. Furthermore, this method does not introduce new impurities when measuring the metallic iron content in the particle steel, has a short measurement time, and is highly efficient. The invention has guiding significance for the use of hot-pressed granular steel blocks for steelmaking.

[0031] 2. The method for determining the metallic iron content in particle steel provided by the present invention has a high accuracy in the standard curve of the ratio of the iron mass fraction in nickel-based metal to the light intensity, and a small error in the segregation of the iron content.

[0032] According to the present invention, when preparing the nickel-based metal to be tested, the metal is kept boiling after being completely melted, and the heat source is removed and then left for a period of time, so that the entire process can be completed within 3-5 minutes, thereby reducing the risk of crucible melt-through, shortening the measurement time, and improving the analysis efficiency. Furthermore, after the boiling is completed, the metal is left for a period of time, so that bubbles in the nickel-based metal to be tested can be reduced, and demolding can be easily achieved after the casting is completed. This operation can also make the particle steel to be tested and the metal nickel more evenly mixed, and the obtained nickel-based metal sample to be tested has better uniformity.

[0033] The method melts the steel particles to be tested and the nickel metal in a silicon-aluminum ceramic crucible without introducing other impurities, thereby improving the cleanliness of the nickel-based metal to be tested and reducing errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1It is a standard curve of the ratio of the mass fraction of iron in nickel-based metal to the light intensity established by the present invention. DETAILED DESCRIPTION

[0036] The following examples are provided for a better understanding of the present invention and are not intended to limit the best mode of implementation. They do not limit the content and scope of protection of the present invention. Any product identical or similar to the present invention obtained by anyone under the guidance of the present invention or by combining the features of the present invention with other prior arts shall fall within the scope of protection of the present invention.

[0037] If no specific experimental steps or conditions are specified in the examples, the conventional experimental steps or conditions described in the literature in this field can be used. If the manufacturer of the reagents or instruments is not specified, they are all commercially available conventional reagents.

[0038] The following instruments are used in the examples and comparative examples:

[0039] Spark source atomic emission spectrometer, ARL 4460, Thermo Fisher Scientific Inc., equipped with a nickel-based analysis system;

[0040] High-frequency remelting machine, Lifumat-Met-3,3-VAC, Liheng, Germany;

[0041] Electronic balance, XP204, Mettler-Toledo.

[0042] The raw materials used in the following examples and comparative examples are:

[0043] Nickel metal: purity > 99.5%, iron content < 0.02%, particle size < 10mm;

[0044] Metallic iron: purity >99.5%.

[0045] Example 1

[0046] This embodiment provides a method for determining the metallic iron content in a particle steel hot-pressed block, which specifically includes:

[0047] (1) Weigh 5.8767 g of crushed and sieved particle steel hot pressed blocks, and place them and 46.1543 g of nickel metal in a ceramic crucible, wherein the crushed particle steel hot pressed blocks can be loaded into the crucible, and there is no special requirement for their particle size. 21.6121 g of nickel metal is placed at the bottom of the silicon-alumina ceramic crucible as a base, and the particle steel hot pressed blocks are placed in the middle of the silicon-alumina ceramic crucible, and the remaining nickel metal covers the particle steel hot pressed blocks;

[0048] Under vacuum conditions of 25±1Pa, place the crucible in a high-frequency remelting machine and heat it to melt the particle steel and metallic nickel. After all are melted, keep boiling for 30 seconds, then turn off the high-frequency power supply, place it in the high-frequency remelting machine for 10 seconds, take it out after centrifugal casting, and then demold it after water cooling to obtain the nickel-based metal to be tested for use.

[0049] (2) Prepare 19 nickel-based metal standard samples with known iron content, specifically,

[0050] CRM SRM1243 (the Fe mass fraction of the standard sample is 0.776%), RNi 14 / 20 (the Fe mass fraction of the standard sample is 1.12%), YSBS41507-2016 (the Fe mass fraction of the standard sample is 1.26%), CRM IARM51A (the Fe mass fraction of the standard sample is 1.41%), YSBS41502-2012 (the Fe mass fraction of the standard sample is 3.50%), CRM IARM66A (the Fe mass fraction of the standard sample is 5.81%), RNi 13 / 36 (the Fe mass fraction of the standard sample is 6.0%), CRM SRMC2402 (the Fe mass fraction of the standard sample is 7.3%), CRM BS690A (the Fe mass fraction of the standard sample is 9.08%), CRM SRM1244 (the mass fraction of Fe in the standard sample is 9.63%), CRMIARM67C (the mass fraction of Fe in the standard sample is 13.44%), CRM SRM1160 (the mass fraction of Fe in the standard sample is 14.3%), CRM IARM67A (the mass fraction of Fe in the standard sample is 14.88%), CRM SRM1249 (the mass fraction of Fe in the standard sample is 17.693%), YSBS41503-2012 (the mass fraction of Fe in the standard sample is 18.54%), RNi 15 / 40 (the mass fraction of Fe in the standard sample is 18.90%), CRM BS825D (the mass fraction of Fe in the standard sample is 25.92%), CRM BS825E (the mass fraction of Fe in the standard sample is 31.45%), and YSBS41508-2018 (the mass fraction of Fe in the standard sample is 32.5%).

[0051] Using the Fe273.07nm / Ni243.79nm spectral line, the nickel-based metal standard sample was placed on a spark source atomic emission direct reading spectrometer for testing to obtain the light intensity ratio of iron to nickel in the nickel-based metal. A standard curve of the iron mass fraction and the light intensity ratio in the nickel-based metal was established. The calibration coefficient was 0.9993, and the standard curve was y = 10.328x-0.1098, where y is the mass fraction of metallic iron in the nickel-based metal and x is the light intensity ratio. The standard curve is shown in Figure 2. Figure 1 .

[0052] (3) The nickel-based metal to be measured in step (1) is placed in a spark source atomic emission direct reading spectrometer for measurement, and the mass fraction y of iron in the nickel-based metal to be measured is obtained by using a standard curve. Substituting y into formula 1, the mass fraction W of metallic iron in the particle steel hot-pressed block is obtained. Fe .

[0053]

[0054] m1 is the mass of the steel particle to be measured, in g;

[0055] m2 is the mass of nickel metal in g;

[0056] y is the mass fraction of metallic iron in nickel-iron based metal, in %;

[0057] W Fe It is the mass fraction of metallic iron in the particle steel to be tested, in %.

[0058] The nickel-based metal sample to be tested was placed in a spark source atomic emission direct reading spectrometer and measured six times. The average value, standard deviation and relative standard deviation of the mass fraction of metallic iron in the particle steel to be tested for these six times were calculated. The results are shown in Table 1.

[0059] Example 2

[0060] This embodiment provides a method for determining the metallic iron content in a particle steel hot-pressed block, which specifically includes:

[0061] (1) Weigh 5.6116 g of crushed and sieved particle steel hot pressed blocks, and place them and 44.5717 g of nickel metal in a ceramic crucible, wherein the crushed particle steel hot pressed blocks can be loaded into the crucible, and there is no special requirement for their particle size. 22.8350 g of nickel metal is placed at the bottom of the silicon-alumina ceramic crucible as a base, and the particle steel hot pressed blocks are placed in the middle of the silicon-alumina ceramic crucible, and the remaining nickel metal covers the particle steel hot pressed blocks;

[0062] Under vacuum conditions of 20±1Pa, place the crucible in a high-frequency remelting machine and heat it to melt the particle steel and metallic nickel. After all are melted, keep boiling for 40 seconds, then turn off the high-frequency power supply, place it in the high-frequency remelting machine for 12 seconds, take it out after centrifugal casting, and then demold it after water cooling to obtain the nickel-based metal to be tested for use.

[0063] (2) A standard curve of the ratio of the mass fraction of iron in nickel-based metal to the light intensity was established according to the method of Example 1. The standard curve was the same as that of Example 1.

[0064] (3) The nickel-based metal to be measured in step (1) is placed in a spark source atomic emission direct reading spectrometer for measurement, and the mass fraction y of iron in the nickel-based metal to be measured is obtained by using a standard curve. Substituting y into formula 1, the mass fraction W of metallic iron in the particle steel hot-pressed block is obtained. Fe .

[0065]

[0066] m1 is the mass of the steel particle to be measured, in g;

[0067] m2 is the mass of nickel metal in g;

[0068] y is the mass fraction of metallic iron in nickel-based metal, in %;

[0069] W Fe is the mass fraction of metallic iron in the particle steel to be tested, in %

[0070] The nickel-based metal sample to be tested was placed in a spark source atomic emission direct reading spectrometer and measured six times. The average value, standard deviation and relative standard deviation of the mass fraction of metallic iron in the particle steel to be tested for these six times were calculated. The results are shown in Table 1.

[0071] Example 3

[0072] This embodiment provides a method for determining the metallic iron content in a particle steel hot-pressed block, which specifically includes:

[0073] (1) Weigh 10.1184 g of crushed and sieved particle steel hot pressed blocks, and place them and 48.7896 g of nickel metal in a ceramic crucible, wherein the crushed particle steel hot pressed blocks can be loaded into the crucible, and there is no special requirement for their particle size. 20.1960 g of nickel metal is placed at the bottom of the silicon-alumina ceramic crucible as a base, and the particle steel hot pressed blocks are placed in the middle of the silicon-alumina ceramic crucible, and the remaining nickel metal covers the particle steel hot pressed blocks;

[0074] Under vacuum conditions of 15±1Pa, place the crucible in a high-frequency remelting machine and heat it to melt the particle steel and metallic nickel. After all are melted, keep boiling for 50 seconds, then turn off the high-frequency power supply, place it in the high-frequency remelting machine for 8 seconds, take it out after centrifugal casting, and then demold it after water cooling to obtain the nickel-based metal to be tested for use.

[0075] (2) A standard curve of the ratio of the mass fraction of iron in nickel-based metal to the light intensity was established according to the method of Example 1. The standard curve was the same as that of Example 1.

[0076] (3) The nickel-based metal to be measured in step (1) is placed in a spark source atomic emission direct reading spectrometer for measurement, and the mass fraction y of iron in the nickel-based metal to be measured is obtained by using a standard curve. Substituting y into equation 1, the mass fraction W of metallic iron in the particle steel hot-pressed block is obtained. Fe .

[0077]

[0078] m1 is the mass of the steel particle to be measured, in g;

[0079] m2 is the mass of nickel metal in g;

[0080] y is the mass fraction of metallic iron in nickel-based metal, in %;

[0081] W Fe is the mass fraction of metallic iron in the particle steel to be tested, in %

[0082] The nickel-based metal sample to be tested was placed in a spark source atomic emission direct reading spectrometer and measured six times. The average value, standard deviation and relative standard deviation of the mass fraction of metallic iron in the particle steel to be tested for these six times were calculated. The results are shown in Table 1.

[0083] Table 1 Mass fraction of metallic iron in the steel blocks obtained in Examples 1-3

[0084]

[0085]

[0086] According to the above results, it can be seen that the iron mass fraction obtained by the method for determining the metallic iron content in the particle steel provided by the present invention has a small deviation, the standard deviation is ≤0.05%, and the relative standard deviation is <0.5, indicating that the nickel-based metal to be measured has good uniformity and the standard curve has high precision.

[0087] Test example

[0088] This test example verifies the method for determining the metallic iron content in the particle steel provided by the present invention.

[0089] Test 1

[0090] 5.1543g of metallic iron and 44.8732g of metallic nickel were mixed and placed in a ceramic crucible, which was then placed in a high-frequency remelting machine and heated to melt the metallic iron and metallic nickel. After they were completely melted, the mixture was kept boiling for 30 seconds, the high-frequency power supply was turned off, the mixture was placed in the high-frequency remelting machine for 10 seconds, centrifugally cast, and water-cooled before demolding to obtain a nickel-based metal with a known iron content. The nickel-based metal was placed on a spark source atomic emission direct reading spectrometer for testing, and the mass fraction of iron in the nickel-based metal was obtained using the standard curve provided by the present invention. The result is the analytical value of the mass content of iron in the nickel-based metal, which is compared with the theoretical value of the nickel-based metal to analyze the error. The results are shown in Table 2. Wherein, the theoretical value refers to the mass fraction of iron in the nickel-based metal calculated according to the weighed mass of metallic iron and nickel, and the calculation method is referred to Formula 2; the analytical value refers to the mass fraction of iron in the nickel-based metal obtained by spectral analysis.

[0091]

[0092] Among them, m 铁 is the mass of metallic iron in g;

[0093] m 镍 is the mass of metallic nickel in g.

[0094] Test 2

[0095] 10.3647 g of metallic iron and 39.1869 g of metallic nickel were mixed and placed in a ceramic crucible, which was then placed in a high-frequency remelting machine and heated to melt the metallic iron and metallic nickel. After all of the metal was melted, the mixture was kept boiling for 30 seconds. The high-frequency power supply was turned off, and the mixture was placed in the high-frequency remelting machine for 10 seconds before centrifugal casting. The mixture was water-cooled and demolded to obtain a nickel-based metal with a known iron content. The nickel-based metal was placed on a spark source atomic emission direct reading spectrometer for testing, and the mass content of iron in the nickel-based metal was obtained using the standard curve provided by the present invention. The result was an analytical value of the mass content of iron in the nickel-based metal, which was compared with the theoretical value of the nickel-based metal to analyze the error. The results are shown in Table 2, and the theoretical value calculation formula refers to Formula 2.

[0096] Test 3

[0097] 13.5685 g of metallic iron and 36.7632 g of metallic nickel were mixed and placed in a ceramic crucible. The ceramic crucible was then placed in a high-frequency remelting machine and heated to melt the metallic iron and metallic nickel. After they were completely melted, the mixture was kept boiling for 30 seconds. The high-frequency power supply was turned off, and the mixture was placed in the high-frequency remelting machine for 10 seconds before centrifugal casting. The mixture was water-cooled and demolded to obtain a nickel-based metal with a known iron content. The nickel-based metal was placed on a spark source atomic emission direct reading spectrometer for testing. The mass fraction of iron in the nickel-based metal was obtained using the standard curve provided by the present invention. The result was an analytical value of the mass content of iron in the nickel-based metal. The result was compared with the theoretical value of the nickel-based metal to analyze the error. The results are shown in Table 2. The theoretical value calculation formula refers to Formula 2.

[0098] Table 2 Theoretical and analytical values ​​of iron in nickel-based metal standard samples in each test

[0099] Example Theoretical value wt% Analytical value wt% Deviation wt% Test 1 10.30 10.35 0.05 Test 2 20.92 21.03 0.11 Test 3 26.96 27.05 0.09

[0100] Note: Deviation = theoretical value - analytical value.

[0101] From the results in Table 2, it can be seen that the metallic iron content in the particle steel measured by the method of the present invention has a small deviation and high accuracy; at the same time, the determination method is fast, low-cost, and highly representative, which is conducive to promotion and application.

[0102] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A method for determining the content of metallic iron in particle steel, characterized in that: The following steps are included: (1) The particle steel to be tested and the metal nickel are melted and cast to obtain the nickel-based metal to be tested; the mass ratio of the particle steel to be tested to the metal nickel is 1:(4-9); the particle steel to be tested and the metal nickel are melted in a silicon-aluminum ceramic crucible; in the step (1), the specific preparation steps of the nickel-based metal to be tested include heating to completely melt the particle steel to be tested and the metal nickel and then keeping boiling for 30-60 seconds, turning off the heating source and leaving it for 5-15 seconds, centrifugally casting, and cooling; the step (1) is carried out under vacuum or inert gas atmosphere; (2) Selecting a nickel-based metal standard sample with a known iron mass fraction, using a spark source atomic emission direct reading spectrometer to obtain the light intensity ratio of iron to nickel in the nickel-based metal standard sample, and establishing a standard curve of the iron mass fraction in the nickel-based metal and the light intensity ratio; using the Fe273.07nm / Ni243.79nm spectral line, establishing a standard curve of the iron mass fraction in the nickel-based metal and the light intensity ratio; (3) The mass fraction of iron in the nickel-based metal to be tested is obtained using the standard curve, and then the mass fraction of metallic iron in the particle steel to be tested is obtained.

2. The measuring method according to claim 1, wherein The mass fraction of metallic iron in the nickel-based metal standard sample is 5-30%.

3. The measuring method according to claim 1 or 2, wherein In step (2), the standard curve is y =10.328 x - 0.1098, with a calibration factor of 0.9993; in, y is the mass fraction of metallic iron in nickel-based metals, x is the ratio of light intensity of iron to nickel.

4. The measuring method according to claim 1, wherein In the step (3), the calculation formula for the mass fraction of metallic iron in the particle steel to be measured is: Formula 1 in, m 1 is the mass of the steel particle to be tested, in g; m 2 is the mass of nickel metal in g; y It is the mass fraction of metallic iron in nickel-based metals, in %.

5. The measuring method according to claim 1, wherein In the step (1), the mass of the steel particles to be tested is ≥5 g.

6. The measuring method according to claim 1, wherein The steel particles to be tested and the metal nickel are placed in the silicon-aluminum ceramic crucible in such a manner that part of the metal nickel is placed at the bottom of the silicon-aluminum ceramic crucible, the steel particles to be tested are placed in the middle of the ceramic crucible, and the remaining metal nickel covers the steel particles to be tested.

7. The measuring method according to claim 1, wherein The purity of the metallic nickel is greater than 99.5%, and the iron content is less than or equal to 0.02%.

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