Method, system and equipment for detecting components of sintered ore

Abstract

The invention provides a method, system and equipment for detecting components of sintered ore, and the detection method comprises the following steps: calculating intensity proportions of spectral lines corresponding to metal and non-metal elements in plasma spectral data, and calculating contents corresponding to the metal and non-metal elements according to the intensity proportions corresponding to the metal and non-metal elements and a standard mapping curve of the metal and non-metal elements; calculating the first content of ferrous oxide according to the strength ratio of the iron element and the first standard mapping curve; calculating a second content of ferrous oxide according to the magnetic induction intensity variable quantity of the sample to be detected before and after the sample is placed at the detection point and a second standard mapping curve; according to the first content and the second content, calculating the content of ferrous oxide in the to-be-detected sample, and generating the content of metal and non-metal elements and the content of ferrous oxide in the to-be-detected sample. According to the method, the content of metal and non-metal elements and the content of ferrous oxide in the sample to be detected can be accurately calculated.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, and in particular to a method, system and equipment for detecting the composition of sintered ore. Background Technology

[0002] In the steel manufacturing process of the metallurgical industry, sinter is the most important element fed into the blast furnace for ironmaking. The stability of the sinter composition is closely related to indicators such as the sinter yield and drum strength. Among the existing methods for detecting the composition of sinter, the neutron activation method can achieve rapid detection of sinter composition, but it can only detect the total amount of iron, and cannot detect the specific content of iron in the divalent iron (Fe2+) state. Therefore, there is room for improvement. Summary of the Invention

[0003] This invention provides a method, system, and equipment for detecting the composition of sintered ore, thereby solving the technical problem that existing methods for detecting the composition of sintered ore cannot accurately detect ferrous oxide in sintered ore.

[0004] This invention provides a method for detecting the composition of sintered ore, comprising:

[0005] The plasma spectral data generated by laser ablation of the sample under test under magnetic field confinement at the detection point are obtained, as well as the magnetic induction intensity of the sample before and after it is placed at the detection point.

[0006] The intensity proportions of the corresponding spectral lines of metallic and non-metallic elements in the plasma spectral data are calculated. Based on the intensity proportions of the corresponding metallic and non-metallic elements and their standard mapping curves, the contents of the corresponding metallic and non-metallic elements are calculated. The standard mapping curves of the metallic and non-metallic elements represent the mapping relationship between the intensity proportions of the spectral lines of metallic and non-metallic elements and their contents in a standard sintered ore sample under laser ablation and magnetic field confinement. The metallic elements include at least iron, calcium, magnesium, and aluminum; the non-metallic elements include at least silicon.

[0007] The first content of ferrous oxide is calculated based on the intensity ratio of iron in the metallic elements and the first standard mapping curve; wherein, the first standard mapping curve is the mapping relationship between the intensity ratio of iron spectral lines and the ferrous oxide content of a standard sintered ore sample under laser ablation and magnetic field confinement.

[0008] The second content of ferrous oxide is calculated based on the change in magnetic induction intensity before and after the sample is placed at the detection point and the second standard mapping curve; wherein, the second mapping curve is the mapping relationship between magnetic induction intensity and ferrous oxide content of standard sintered ore sample under laser ablation and magnetic field confinement.

[0009] Based on the first content and the second content, the content of ferrous oxide in the sample to be tested is calculated, and the content of metal and non-metal elements and the content of ferrous oxide in the sample to be tested are generated.

[0010] In one embodiment of the present invention, the step of calculating the intensity ratio of the corresponding spectral lines of metallic and non-metallic elements in the plasma spectral data includes:

[0011] In the plasma spectral data, the sum of the intensity values ​​of all spectral lines corresponding to the iron element is calculated;

[0012] The intensity ratio is obtained by comparing the intensity value of each spectral line corresponding to the metallic and non-metallic elements with the sum of the intensity values. The intensity percentage is obtained by weighted summing of the intensity ratios of all spectral lines corresponding to the metallic and non-metallic elements.

[0013] In one embodiment of the present invention, the first content satisfies:

[0014]

[0015] Wherein, C1 represents the first content. It is expressed as the intensity ratio, and k1 and b1 are non-zero constants.

[0016] In one embodiment of the present invention, the step of calculating the second content of ferrous oxide based on the change in magnetic induction intensity of the sample before and after placement at the detection point and the established second mapping curve includes:

[0017] The relative permeability of the sample is obtained by comparing the current magnetic flux density of the sample after it is placed at the detection point with the initial magnetic flux density of the sample before it is placed at the detection point.

[0018] The second content of ferrous oxide is calculated based on the relative permeability of the sample to be tested and the second mapping curve.

[0019] In one embodiment of the present invention, the second content satisfies:

[0020] C2 = k2*μ + b2;

[0021] Where C2 represents the second content, μ represents the relative permeability, and k2 and b2 represent non-zero constants.

[0022] In one embodiment of the present invention, the step of calculating the content of ferrous oxide in the sample to be tested based on the first content and the second content includes:

[0023] The ferrous oxide content in the sample to be tested is calculated by weighted summation of the first content and the second content.

[0024] In one embodiment of the present invention, the sample to be tested is within a preset particle size range and a preset weight range, and the surface of the sample to be tested is flat.

[0025] This invention also proposes a system for detecting the composition of sintered ore, comprising:

[0026] The acquisition unit is used to acquire plasma spectral data generated by laser ablation of the sample under test under magnetic field constraint at the detection point, and to acquire the magnetic induction intensity of the sample before and after it is placed at the detection point.

[0027] The element content calculation unit is used to calculate the intensity ratio of the corresponding spectral lines of metallic and non-metallic elements in the plasma spectral data, and to calculate the content of the corresponding metallic and non-metallic elements based on the intensity ratio of the corresponding metallic and non-metallic elements and the standard mapping curve of the metallic and non-metallic elements. The standard mapping curve of the metallic and non-metallic elements is the mapping relationship between the intensity ratio of the spectral lines of metallic and non-metallic elements and the content of the metallic and non-metallic elements in a standard sintered ore sample under laser ablation and magnetic field confinement. The metallic elements include at least iron, calcium, magnesium, and aluminum; the non-metallic elements include at least silicon.

[0028] The first content calculation unit is used to calculate the first content of ferrous oxide based on the intensity ratio of iron in the metal element and the first standard mapping curve; wherein, the first standard mapping curve is the mapping relationship between the intensity ratio of iron spectral lines and the ferrous oxide content of a standard sintered ore sample under laser ablation and magnetic field confinement.

[0029] The second content calculation unit is used to calculate the second content of ferrous oxide based on the change in magnetic induction intensity before and after the sample to be tested is placed at the detection point and the second standard mapping curve; wherein, the second mapping curve is the mapping relationship between magnetic induction intensity and ferrous oxide content of the standard sintered ore sample under laser ablation and magnetic field confinement.

[0030] The generation unit is used to calculate the content of ferrous oxide in the sample to be tested based on the first content and the second content, and to generate the content of metal and non-metal elements and the content of ferrous oxide in the sample to be tested.

[0031] The present invention also proposes a device for detecting the composition of sintered ore, which applies the detection method for sintered ore composition as described above, wherein the detection device comprises:

[0032] Material conveying mechanism, used to carry and transport the sintered ore sample to be tested;

[0033] A dichroic mirror is located on the emitting side of the laser.

[0034] The first focusing lens has its incident surface facing the coated surface of the dichroic mirror and its exit surface facing the sample to be tested on the material conveying mechanism; wherein, the pulsed laser emitted by the laser passes through the dichroic mirror and the first focusing lens and is focused on the surface of the sample to be tested for ablation.

[0035] The second focusing lens has its incident surface facing the coated surface of the dichroic mirror;

[0036] The spectrometer has its receiving end facing the exit surface of the second focusing lens; wherein, the plasma generated by the pulsed laser ablation of the sample under test is reflected by the dichroic mirror and passes through the second focusing lens, and then converges to the receiving end of the spectrometer, and the spectrometer acquires the plasma spectral data generated by the laser ablation of the sample under test.

[0037] In one embodiment of the present invention, the detection device further includes:

[0038] At least two permanent magnets are respectively arranged on both sides of the path through which the material conveying mechanism transports the sample to be tested, and a detection point with a magnetic field area is formed between the permanent magnets located on both sides of the material conveying mechanism.

[0039] A magnetic flux detection component is used to obtain the magnetic induction intensity of the sample before and after it is placed at the detection point.

[0040] The beneficial effects of this invention are as follows: The method, system, and equipment for detecting the composition of sintered ore proposed in this invention can detect the content of metallic and non-metallic elements, such as iron, calcium, silicon, magnesium, and aluminum, through magnetic field-confined laser-induced breakdown spectroscopy. The iron content in the sintered ore is expressed as total iron (TFe) content, including ferrous oxide and ferric oxide, and the content of ferrous oxide (ferrous divalent) can also be detected. The change in magnetic flux is only applied to the detection of ferrous oxide (ferrous divalent), thereby further improving the detection accuracy of ferrous oxide (ferrous divalent). This allows for the generation of the content of metallic and non-metallic elements, as well as the content of ferrous oxide, in the sintered ore sample. Attached Figure Description

[0041] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0042] In the attached diagram:

[0043] Figure 1 This is a schematic diagram of the structure of a sinter composition detection device provided in one embodiment of the present invention.

[0044] Figure 2 This is a schematic diagram of the material conveying mechanism provided in one embodiment of the present invention.

[0045] Figure 3 This is a schematic diagram of the steps of a method for detecting the composition of sintered ore provided in one embodiment of the present invention.

[0046] Figure 4 This is a structural block diagram of a sinter composition detection system provided in one embodiment of the present invention.

[0047] The attached figures are labeled as follows:

[0048] 110. Acquisition Unit; 120. Element Content Calculation Unit; 130. First Content Calculation Unit; 140. Second Content Calculation Unit; 150. Generation Unit;

[0049] 10. Material conveying mechanism; 101. Conveyor belt; 102. Roller; 103. Transparent cover; 104. Sample to be tested; 105. Conveyor belt transport path;

[0050] 201. Laser; 202. Total internal reflection mirror; 203. Dichroic mirror; 204. First focusing lens; 205. Second focusing lens; 206. Fiber optic box; 207. Spectrometer; 208. Synchronization signal generator; 209. Computer;

[0051] 301. Permanent magnet; 302. Magnetic flux detection coil; 303. Magnetic flux detector. Detailed Implementation

[0052] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0053] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0054] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0055] Please see Figures 1 to 2 This invention proposes a device for detecting the composition of sintered ore, which can be applied to detect the content of different elements in sintered ore, such as the content of ferrous oxide. Studies have shown that a 1% change in the ferrous oxide (FeO) content in sintered ore affects the blast furnace coke ratio and output by 1% to 1.5%. The stability of the FeO content in sintered ore not only affects its mechanical strength, low-temperature reduction pulverization rate, and return rate, but also the stability of indicators such as blast furnace utilization coefficient, heat balance, fuel ratio, and molten iron quality. Therefore, the FeO content and the content of various elements in sintered ore are among the main indicators for evaluating sintered ore quality. Detailed descriptions are provided below through specific embodiments.

[0056] Please see Figure 1 The present invention proposes a device for detecting the composition of sintered ore, which may include a material conveying mechanism 10, a laser 201, a dichroic mirror 203, a first focusing lens 204, a second focusing lens 205, a spectrometer 207, and a computer 209.

[0057] The material conveying mechanism 10 is used to carry and transport the sintered ore sample 104 to be tested.

[0058] Specifically, laser 201 can be a single-pulse laser with a wavelength of 1064nm and a pulse energy set to 100 millijoules. Laser 201 is responsible for generating a high-energy pulsed laser beam, and the repetition frequency and triggering sequence of the laser pulses are precisely controlled by a computer. Laser 201 is installed at the beginning of the system's optical path, with its emitting side aligned with dichroic mirror 203 to ensure that the output laser beam can be accurately guided to subsequent optical components. The operation of laser 201 and the acquisition action of spectrometer 207 are strictly synchronized through synchronous signal generator 208, ensuring that spectrometer 207 can capture the plasma radiation signal in a timely manner at the moment the laser ablates the surface of the sample 104 under test.

[0059] Specifically, the dichroic mirror 203 is located in the optical path after the laser 201 irradiation. The coated surface of the dichroic mirror 203 is specially designed to efficiently transmit 1064 nm wavelength laser light while highly reflecting broadband radiation light generated by plasma. The installation angle of the dichroic mirror 203 is precisely adjusted to ensure that the pulsed laser light irradiated from the laser 201 can pass through the dichroic mirror 203 with almost no loss and continue to propagate along the original direction to pass through the first focusing lens 204, and then ablate the surface of the sample 104 under test. At the same time, the reflective surface of the dichroic mirror 203 is precisely aligned with the direction of the second focusing lens 205 so that the plasma radiation light generated after the surface of the sample 104 under test is ablated by the laser is reflected by the dichroic mirror 203, passes through the second focusing lens 205, and is focused to the receiving end of the spectrometer 207.

[0060] Specifically, the first focusing lens 204 is located directly above the material conveying mechanism 10, with its incident surface facing the transmission surface of the dichroic mirror 203. It is used to receive and focus the pulsed laser light passing through the dichroic mirror 203. The first focusing lens 204 employs an antireflective coating material suitable for a 1064 nm laser wavelength, effectively reducing energy loss during transmission. The first focusing lens 204 focuses the pulsed laser beam into a very small focal point, which precisely falls on the detection point of the sample 104 on the material conveying mechanism 10, ensuring sufficient laser energy density to ablate the sample 104 and generate plasma. The focal length and position of the first focusing lens 204 are precisely calculated and adjusted to ensure consistency in focal size and position, thereby improving ablation stability and the repeatability of the spectral signal.

[0061] Specifically, the incident surface of the second focusing lens 205 faces the reflecting surface of the dichroic mirror 203, and is specifically used to collect and focus the plasma emitted from the surface of the sample 104 and reflected by the dichroic mirror 203. The second focusing lens 205 has a large receiving aperture and an appropriate focal length, enabling it to efficiently capture the scattered plasma light signal and converge it to the end face of the coupling fiber. The second focusing lens 205 and the first focusing lens 204 do not interfere with each other in the optical path, and are responsible for laser incident and signal collection functions respectively. Optical path separation is achieved through the dichroic mirror 203, thereby optimizing signal collection efficiency and reducing background interference.

[0062] Specifically, the receiver of spectrometer 207 is connected to the output surface of the second focusing lens 205 via a coupling optical fiber, and is responsible for receiving the plasma radiation light signal focused by the second focusing lens 205. Spectrometer 207 employs a multi-channel high-resolution spectral detection device, capable of rapidly acquiring spectral information covering the characteristic spectral lines of the analyte element across a wavelength range. Internally, spectrometer 207 is equipped with a photoelectric sensor and an analog-to-digital converter module to analyze the plasma generated by the pulsed laser ablation of the sample 104. For example, in the received plasma, the characteristic spectral lines corresponding to metallic and non-metallic elements in the sintered ore are analyzed, and the data is transmitted to computer 209 for further processing via a data line. The trigger acquisition action of spectrometer 207 and the output pulse of laser 201 are precisely synchronized with a delay by a synchronization signal generator 208, ensuring that the acquired signal is a stable plasma signal generated at the instant of laser ablation.

[0063] Computer 209 is electrically connected to laser 201 and spectrometer 207, respectively, and is responsible for controlling the operation sequence of the entire detection equipment and processing the acquired data. Computer 209 sends trigger commands to laser 201 to control its light output, and simultaneously sends acquisition commands to spectrometer 207 and receives the spectral data transmitted from it. Computer 209 has built-in professional spectral analysis software, which uses a multi-spectral line intensity normalization internal standard algorithm to analyze the spectral data and calculate the content of various metallic and non-metallic elements in the sintered ore.

[0064] Please see Figure 1 and Figure 2 In one embodiment of the present invention, the detection device may further include a total reflection mirror 202, which may be located on the emitting side of the laser 201 and is used to reflect the pulsed laser to the emitting side of the dichroic mirror 203.

[0065] Specifically, when the laser 201 is set horizontally, the total reflection mirror 202 serves to reflect the pulsed laser emitted by the laser 201.

[0066] Please see Figure 1 and Figure 2 In one embodiment of the present invention, the material conveying mechanism 10 may include a conveyor belt 101, a transparent cover 103, and a roller 102.

[0067] Specifically, the conveyor belt 101 is the core component of the material conveying mechanism, specifically designed to carry and transport the test sample 104 of sintered ore after crushing and quantitative reduction. The conveyor belt 101 can be made of a wear-resistant and flexible material to ensure stable operation over extended periods and to withstand the weight of the material. The conveyor belt 101 can move at a precisely controlled constant speed of 20 mm / s, ensuring that the test sample 104 has sufficient time to undergo laser ablation and spectral analysis at the detection point, while also meeting the high efficiency and high throughput requirements of the online detection equipment. The width and structure of the conveyor belt 101 are designed according to the throughput and shaping requirements of the sintered ore test sample 104, ensuring that the test sample 104 does not scatter or shift during transport, providing a stable and consistent sample plane for subsequent laser detection.

[0068] Specifically, the transparent cover 103 is a crucial sealing component, made of high-strength transparent material, and tightly fitted around the entire periphery of the conveyor belt 101. The main function of the transparent cover 103 is to provide a sealed detection environment, effectively preventing dust from the outside air from contaminating the sample 104 and the optical components inside the system. It also prevents tiny particles generated during laser ablation from escaping into the external environment. The transparency of the transparent cover 103 allows operators to directly observe the sample transport status and internal operation of the conveyor belt 101 from the outside, facilitating real-time monitoring and troubleshooting. A sealing strip connects the transparent cover 103 to the conveyor belt 101 support, ensuring the airtightness of the entire internal space and creating a stable and clean working environment for laser-induced breakdown spectroscopy detection.

[0069] Specifically, the roller 102 is a key shaping component in the material conveying mechanism 10, installed above and mechanically connected to the conveyor belt 101. A precise gap is maintained between the roller 102 and the bearing surface of the conveyor belt 101, the size of which is set according to the typical particle size of the test sample 104 of the sinter to be tested and the required compaction thickness. As the conveyor belt 101 carries the test sample 104 forward, the roller 102 contacts the upper surface of the test sample 104, continuously scraping, rolling, and compacting the loose and uneven sample 104 through its own weight and rotational motion. This process shapes the test sample 104 into a flat, uniformly dense cuboid shape, greatly eliminating inconsistencies in surface height and density. This provides a crucial prerequisite for the subsequent generation of stable and repeatable plasma by laser ablation, thereby directly improving the accuracy and reliability of the spectral detection data.

[0070] Please see Figure 1 and Figure 2In one embodiment of the present invention, the detection device may further include a permanent magnet 301 and a magnetic flux detection component.

[0071] Specifically, the number of permanent magnets 301 can be at least two. These two permanent magnets 301 can be precisely installed at symmetrical positions on both sides of the path along which the sample 104 is transported on the conveyor belt 101, forming a magnetic field region between the permanent magnets 301 on both sides of the conveyor belt 101. The constant magnetic induction intensity corresponding to the magnetic field region generated by the permanent magnets 301 can be 0.5T, which can effectively confine the plasma generated by laser ablation, thereby enhancing the spectral signal and improving detection accuracy, and also provide a sufficiently strong background magnetic field for permeability detection.

[0072] Specifically, the distance between the permanent magnet 301 on one side of the conveyor belt 101 and the conveyor belt 101 is the same as the distance between the permanent magnet 301 on the other side of the conveyor belt 101 and the conveyor belt 101. The permanent magnets 301 are symmetrically installed on both sides of the conveyor belt 101 to ensure a uniform magnetic field distribution at the detection point on the conveyor belt 101. The distance between each permanent magnet 301 and the conveyor belt 101 remains strictly equal to avoid the influence of magnetic field asymmetry on the detection results.

[0073] Specifically, the magnetic flux detection component consists of a magnetic flux detection coil 302 and a magnetic flux detector 303, specifically designed to detect changes in magnetic induction intensity in the magnetic field region. This is because ferrous oxide in the sinter generates a certain magnetic induction intensity under magnetic field conditions, and the change in magnetic induction intensity in the magnetic field region between the permanent magnets 301 on both sides of the conveyor belt 101 is due to the influence of ferrous oxide in the sinter. The magnetic flux detection component is electrically connected to the computer 209.

[0074] It should be noted that the magnetic flux detector is responsible for receiving and processing the magnetic induction intensity corresponding to the magnetic field region between the permanent magnets 301 on both sides of the conveyor belt 101, converting it into a digital signal, and transmitting it to the computer for analysis and processing. The magnetic flux detector has high-precision sampling capability, capable of continuously recording magnetic induction intensity data for at least 2 minutes, and the sampling frequency and accuracy meet the requirements for sinter permeability detection. The magnetic flux detector and the computer 209 are electrically connected via a data cable to transmit detection data in real time. The computer 209 calculates the permeability of the sample 104 under test based on the changes in magnetic induction intensity, and then quantitatively analyzes the content of ferrous oxide (FeO) in the sinter. The operation of the entire magnetic flux detection equipment is synchronized with laser-induced breakdown spectroscopy detection to ensure that the data from the two detection methods can be effectively correlated and complemented.

[0075] Please see Figure 1 and Figure 2In one embodiment of the present invention, the pulsed laser emitted by the laser 201 is focused in the region between the two permanent magnets 301, or the pulsed laser emitted by the laser 201 is focused in the region between the two permanent magnets 301.

[0076] Specifically, when the pulsed laser emitted by laser 201 is focused on the region between the two permanent magnets 301, that is, when the ablation point of the sample 104 emitted by laser 201 completely coincides with the measurement point of the magnetic flux detector on the sample 104, it ensures that the two detection methods analyze the same microscopic region of the sample. This synchronous detection method can obtain a highly consistent data correspondence. Laser-induced breakdown spectroscopy provides the elemental composition information at this point, while magnetic flux detection provides the magnetic property data at the same point. By comprehensively processing these two types of synchronously acquired data, the computer can achieve higher accuracy in the quantitative analysis of ferrous oxide (FeO) content because the data from both methods come from the exact same location on the sample, eliminating errors caused by the inhomogeneity of the sample 104.

[0077] Specifically, the pulsed laser emitted by laser 201 is focused on the region between the two permanent magnets 301. This means the ablation point of the sample 104 emitted by laser 201 does not coincide with the measurement point of the magnetic flux detector on the sample 104. The two detection methods analyze different regions of the sample 104, but these regions must have the same physical and chemical properties. This detection method is suitable when the sample 104 has good homogeneity, improving representativeness by expanding the detection range.

[0078] For ease of description, the position where the pulsed laser emitted by the laser 201 illuminates the conveyor belt 101 can be recorded as the detection point. As can be seen from the above, the detection point can be located in the area between the two permanent magnets 301, or the detection point can be located in the area between the two permanent magnets 301.

[0079] Please see Figure 1 and Figure 2 In one embodiment of the present invention, the magnetic flux detection component includes a magnetic flux detection coil 302 and a magnetic flux detector 303.

[0080] A magnetic flux detection coil 302 is mounted on one side of a permanent magnet 301, with its center precisely aligned with the center of the magnetic field region to detect the magnetic flux. Furthermore, the center of the magnetic flux detection coil 302 must be on the same horizontal plane as the center of each permanent magnet 301. The magnetic flux detection coil 301 employs a high-sensitivity design, capable of accurately detecting minute changes in magnetic induction intensity caused by the passage of the sintered ore sample 104. The magnetic flux detection coil 302 is connected to the magnetic flux detector 303 via a shielded cable to ensure that the signal transmission is free from external electromagnetic interference.

[0081] The computer 209 also receives and processes the magnetic field signal from the magnetic flux detector 303, calculates the magnetic permeability of the sample 104 to be tested using the external standard method, and then quantitatively analyzes the content of ferrous oxide (FeO) in the sinter, and finally outputs the complete elemental composition analysis results of the sinter.

[0082] The following will provide a method for detecting the composition of sintered ore based on the above-mentioned sintered ore composition detection system.

[0083] Please see Figure 3 In one embodiment of the present invention, a method for detecting the composition of sintered ore is proposed, which may include the following steps.

[0084] Step S10: Obtain the plasma spectral data generated by laser ablation of the sample under the magnetic field constraint at the detection point, and obtain the magnetic induction intensity of the sample before and after it is placed at the detection point.

[0085] Specifically, the sample 104 to be tested is within a preset particle size range and a preset weight range, and the surface of the sample 104 to be tested is flat.

[0086] Please see Figure 1 In one embodiment of the present invention, firstly, a representative sinter sample can be collected from the finished sinter conveying line using a full-section sampler, and then the sample is crushed using a crushing and reducing machine, for example, crushed to a particle size of less than 3 mm and quantitatively retained to about 3 kg of sample 104.

[0087] Secondly, the processed sample 104 can be evenly distributed on the conveyor belt 101 covered by the transparent cover 103. After being compacted and flattened by the shaping roller 102, it is transported at a constant speed to the detection point constrained by the constant strong magnetic field generated by the neodymium iron boron permanent magnet 301.

[0088] Then, when the sample 104 arrives at the detection point, the pulsed laser 201 is triggered to emit laser light. The laser beam passes through the dichroic mirror 203 and the first focusing lens 204 and is focused onto the surface of the sample 104, generating plasma. The plasma radiation is reflected by the dichroic mirror 203 and coupled into the spectrometer 207 through the second focusing lens 205. The spectrometer 207 simultaneously collects the radiation enhanced by magnetic field confinement and converts it into an electrical signal. The curve of the electrical signal intensity changing with wavelength is the corresponding spectral signal. After a series of processing, calibration, and digitization of the original spectral signal, a structured dataset that can be used for storage, transmission, analysis, and modeling is obtained, which is the corresponding plasma spectral data. At the same time, a magnetic flux detection coil 302, arranged at a fixed position in front of the detection point, measures the magnetic induction intensity at the corresponding detection point position before the sample 104 arrives (unloaded state) and after the arrival (loaded state), and records the two sets of values.

[0089] Specifically, the formula for calculating the magnetic flux detection coil 302 to calculate the magnetic induction intensity satisfies: in, N is the magnetic flux detected by the magnetic flux detection coil 302, N is the number of turns of the magnetic flux detection coil 302, and S is the effective area of ​​the magnetic flux detection coil 302.

[0090] Step S20: Calculate the intensity ratio of the corresponding spectral lines of metallic and non-metallic elements in the plasma spectral data. Based on the intensity ratio of metallic and non-metallic elements and the standard mapping curves of metallic and non-metallic elements, calculate the content of metallic and non-metallic elements. The standard mapping curves of metallic and non-metallic elements are the mapping relationship between the intensity ratio of the spectral lines of metallic and non-metallic elements and the content of metallic and non-metallic elements in a standard sintered ore sample under laser ablation and magnetic field confinement. Metallic elements may include at least iron, calcium, magnesium, and aluminum; non-metallic elements may include at least silicon.

[0091] Specifically, in one embodiment of the present invention, step S20, which calculates the intensity ratio of the corresponding spectral lines of metallic and non-metallic elements in the plasma spectral data, may include steps S210 and S220.

[0092] Step S210: Calculate the sum of the intensity values ​​of all spectral lines corresponding to the iron element in the plasma spectral data.

[0093] Specifically, from the plasma spectral data acquired by spectrometer 207, multiple characteristic spectral lines corresponding to iron and their intensity values ​​are identified and extracted, and the sum of the intensity values ​​of these iron characteristic spectral lines is calculated as the total intensity.

[0094] By employing the multi-spectral line intensity normalization internal standard method, all spectral lines corresponding to iron are selected as internal standards. Internal standards are reference spectral lines used to correct and normalize the intensity of analytical lines. Each spectral line corresponding to iron is then used as an analytical line; an analytical line is a characteristic spectral line emitted by the element to be analyzed and used for quantitative analysis.

[0095] Step S220: Compare the intensity value of each spectral line corresponding to the metal and non-metal elements with the sum of the intensity values ​​to obtain the corresponding intensity ratio. Then, perform a weighted summation of the intensity ratios of all spectral lines corresponding to the metal and non-metal elements to obtain the intensity percentage.

[0096] In one embodiment of the present invention, the intensity value of each characteristic spectral line of a metallic and non-metallic element is divided by the sum of the intensity values ​​to obtain the intensity ratio of each spectral line. A weighted average method is then used to calculate the intensity ratios of all metallic and non-metallic element spectral lines to obtain a representative intensity percentage.

[0097] Specifically, the intensity ratio of each spectral line for metallic and nonmetallic elements is obtained by comparing its intensity value with the sum of its intensity values, satisfying the following:

[0098] The intensity ratios of all spectral lines corresponding to metallic and nonmetallic elements are weighted and summed to obtain the intensity proportions, which satisfy the following:

[0099] Specifically, the intensity ratios of metallic and non-metallic elements are used as input variables and substituted into the standard mapping curves of metallic and non-metallic elements established in advance using standard sintered ore samples. These standard mapping curves reflect the quantitative relationship between the overall intensity ratio of metallic and non-metallic element spectral lines and the content of metallic and non-metallic elements under the same laser parameters and constant strong magnetic field confinement conditions. The content of metallic and non-metallic elements based on spectral data is calculated using these curves.

[0100] Taking iron, a metal and non-metal element, as an example, the content of iron satisfies: C0 = k0*x + b0; where C0 represents the content of iron, and the iron content in sinter is represented by the total iron (TFe) content, including ferrous oxide and ferric oxide, etc., x represents the intensity ratio of iron, and k0 and b0 are non-zero constants.

[0101] In the sintered ore sample to be tested, the content of calcium, silicon, magnesium, aluminum, and other elements (metallic and non-metallic) can be calculated using a similar procedure to that for iron. Furthermore, the content of calcium, silicon, magnesium, and aluminum refers to the total content of the chemical substances corresponding to various valence levels of these elements.

[0102] Step S30: Calculate the first content of ferrous oxide based on the intensity ratio of iron in the metal elements and the first standard mapping curve; wherein, the first standard mapping curve is the mapping relationship between the intensity ratio of iron spectral lines and the ferrous oxide content of a standard sintered ore sample under laser ablation and magnetic field confinement.

[0103] Specifically, the intensity ratio of iron is used as an input variable and substituted into the first standard mapping curve established beforehand using standard sintered ore samples. The first standard mapping curve reflects the quantitative relationship between the comprehensive intensity ratio of iron spectral lines and the ferrous oxide content under the same laser parameters and constant strong magnetic field confinement conditions. The first ferrous oxide content based on the spectral data is calculated using this curve.

[0104] The first content requirement is met: Wherein, C1 represents the first content. The intensity ratio is represented by the proportion of iron, and k1 and b1 are non-zero constants.

[0105] Step S40: Calculate the second content of ferrous oxide based on the change in magnetic induction intensity before and after the sample is placed at the detection point and the second standard mapping curve; wherein, the second mapping curve is the mapping relationship between magnetic induction intensity and ferrous oxide content of the standard sintered ore sample under laser ablation and magnetic field confinement.

[0106] In one embodiment of the present invention, step S40 may include steps S410 and S420.

[0107] Step S410: Compare the current magnetic induction intensity of the sample to be tested after it is placed at the detection point with the initial magnetic induction intensity of the sample to be tested before it is placed at the detection point to obtain the relative permeability of the sample to be tested.

[0108] Specifically, the relative permeability of the sample under test is calculated by measuring the initial magnetic flux density under no-load conditions and the current magnetic flux density under load conditions at the detection point using the magnetic flux detection coil 302.

[0109] The relative permeability of the sample 104 to be tested satisfies: Where μ represents the relative permeability of the sample 104 to be tested, B represents the current magnetic induction intensity of the sample 104 to be tested after it is placed at the detection point, and B0 represents the initial magnetic induction intensity of the sample 104 to be tested before it is placed at the detection point.

[0110] Step S420: Calculate the second content of ferrous oxide based on the relative permeability of the sample to be tested and the second mapping curve.

[0111] Specifically, the calculated relative permeability is used as an input variable and substituted into a second standard mapping curve established beforehand using standard sinter samples. The second standard mapping curve reflects the quantitative relationship between the relative permeability of the sinter sample and its ferrous oxide content under the same constant magnetic field conditions. The second ferrous oxide content based on the change in permeability is calculated using this curve.

[0112] The second content satisfies: C2=k2*μ+b2; where C2 represents the second content, μ represents the relative permeability, and k2 and b2 represent non-zero constants.

[0113] Step S50: Calculate the content of ferrous oxide in the sample to be tested based on the first content and the second content, and generate the content of metal and non-metal elements and the content of ferrous oxide in the sample to be tested.

[0114] In one embodiment of the present invention, the first content and the second content can be weighted and summed to calculate the content of ferrous oxide in the sample 104 to be tested.

[0115] The content of ferrous oxide in sample 104 to be tested satisfies: C FeO =α*C1+βC2, where α and β represent non-zero constants.

[0116] Please see Figure 4 In one embodiment of the present invention, a sinter composition detection system 100 is also proposed, which may include an acquisition unit 110, an element content calculation unit 120, a first content calculation unit 130, a second content calculation unit 140, and a generation unit 140.

[0117] The acquisition unit 110 is used to acquire the plasma spectral data generated by laser ablation of the sample under test under the magnetic field constraint at the detection point, and to acquire the magnetic induction intensity of the sample before and after it is placed at the detection point.

[0118] The element content calculation unit 120 is used to calculate the intensity ratio of the corresponding spectral lines of metallic and non-metallic elements in the plasma spectral data. Based on the intensity ratio of metallic and non-metallic elements and the standard mapping curve of metallic elements, the content of metallic and non-metallic elements is calculated. The standard mapping curve of metallic and non-metallic elements is the mapping relationship between the intensity ratio of the spectral lines of metallic and non-metallic elements and the content of metallic and non-metallic elements in a standard sintered ore sample under laser ablation and magnetic field confinement. The metallic elements include at least iron, calcium, silicon, magnesium, and aluminum; the non-metals include at least silicon.

[0119] The first content calculation unit 130 is used to calculate the first content of ferrous oxide based on the intensity ratio of iron in the metal elements and the first standard mapping curve; wherein, the first standard mapping curve is the mapping relationship between the intensity ratio of iron spectral lines and the ferrous oxide content of a standard sintered ore sample under laser ablation and magnetic field confinement.

[0120] The second content calculation unit 140 is used to calculate the second content of ferrous oxide based on the change in magnetic induction intensity before and after the sample to be tested is placed at the detection point and the second standard mapping curve; wherein, the second mapping curve is the mapping relationship between magnetic induction intensity and ferrous oxide content of the standard sintered ore sample under laser ablation and magnetic field confinement.

[0121] The generation unit 150 is used to calculate the content of ferrous oxide in the sample to be tested based on the first content and the second content, and to generate the content of metal and non-metal elements and the content of ferrous oxide in the sample to be tested.

[0122] In summary, this invention proposes a method, system, and equipment for detecting the composition of sintered ore. It acquires plasma spectral data generated by laser ablation of the sample under magnetic field confinement at the detection point, and obtains the magnetic induction intensity of the sample before and after placement at the detection point. Then, using the intensity ratio of corresponding spectral lines of metallic and non-metallic elements in the plasma spectral data and the standard mapping curves of metallic and non-metallic elements, the content of metallic and non-metallic elements is calculated. Furthermore, using the intensity ratio of corresponding spectral lines of iron in the plasma spectral data and the first standard mapping curve, the first content of ferrous oxide is calculated. The second content of ferrous oxide is also calculated using the change in magnetic induction intensity of the sample before and after placement at the detection point and the second standard mapping curve. By performing a weighted summation of the first content of ferrous oxide corresponding to laser ablation and the second content of ferrous oxide corresponding to magnetic field confinement, the content of ferrous oxide in the sample is calculated more accurately. Thus, the content of metallic and non-metallic elements and the content of ferrous oxide in the sintered ore sample can be generated.

[0123] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for detecting the composition of sintered ore, characterized in that, include: The plasma spectral data generated by laser ablation of the sample under test under magnetic field confinement at the detection point are obtained, as well as the magnetic induction intensity of the sample before and after it is placed at the detection point. The intensity proportions of the corresponding spectral lines of metallic and non-metallic elements in the plasma spectral data are calculated. Based on the intensity proportions of the corresponding metallic and non-metallic elements and their standard mapping curves, the contents of the corresponding metallic and non-metallic elements are calculated. The standard mapping curves of the metallic and non-metallic elements represent the mapping relationship between the intensity proportions of the spectral lines of metallic and non-metallic elements and their contents in a standard sintered ore sample under laser ablation and magnetic field confinement. The metallic elements include at least iron, calcium, magnesium, and aluminum; the non-metallic elements include at least silicon. The first content of ferrous oxide is calculated based on the intensity ratio of iron in the metallic elements and the first standard mapping curve; wherein, the first standard mapping curve is the mapping relationship between the intensity ratio of iron spectral lines and the ferrous oxide content of a standard sintered ore sample under laser ablation and magnetic field confinement. The second content of ferrous oxide is calculated based on the change in magnetic induction intensity before and after the sample is placed at the detection point and the second standard mapping curve; wherein, the second mapping curve is the mapping relationship between magnetic induction intensity and ferrous oxide content of standard sintered ore sample under laser ablation and magnetic field confinement. Based on the first content and the second content, the content of ferrous oxide in the sample to be tested is calculated, and the content of metal and non-metal elements and the content of ferrous oxide in the sample to be tested are generated.

2. The method for detecting the composition of sintered ore according to claim 1, characterized in that, The step of calculating the intensity ratio of the corresponding spectral lines of metallic and non-metallic elements in the plasma spectral data includes: In the plasma spectral data, the sum of the intensity values ​​of all spectral lines corresponding to the iron element is calculated; The intensity ratio is obtained by comparing the intensity value of each spectral line corresponding to the metallic and non-metallic elements with the sum of the intensity values. The intensity percentage is obtained by weighted summing of the intensity ratios of all spectral lines corresponding to the metallic and non-metallic elements.

3. The method for detecting the composition of sintered ore according to claim 1, characterized in that, The first content satisfies: Wherein, C1 represents the first content. It is expressed as the intensity ratio, and k1 and b1 are non-zero constants.

4. The method for detecting the composition of sintered ore according to claim 1, characterized in that, The step of calculating the second content of ferrous oxide based on the change in magnetic induction intensity of the sample before and after placement at the detection point and the established second mapping curve includes: The relative permeability of the sample is obtained by comparing the current magnetic flux density of the sample after it is placed at the detection point with the initial magnetic flux density of the sample before it is placed at the detection point. The second content of ferrous oxide is calculated based on the relative permeability of the sample to be tested and the second mapping curve.

5. The method for detecting the composition of sintered ore according to claim 4, characterized in that, The second content satisfies: C2 = k2*μ + b1; Where C2 represents the second content, μ represents the relative permeability, and k2 and b2 represent non-zero constants.

6. The method for detecting the composition of sintered ore according to claim 1, characterized in that, The step of calculating the ferrous oxide content in the sample to be tested based on the first content and the second content includes: The ferrous oxide content in the sample to be tested is calculated by weighted summation of the first content and the second content.

7. The method for detecting the composition of sintered ore according to claim 1, characterized in that, The sample to be tested is within a preset particle size range and a preset weight range, and the surface of the sample to be tested is flat.

8. A system for detecting the composition of sintered ore, characterized in that, include: The acquisition unit is used to acquire plasma spectral data generated by laser ablation of the sample under test under magnetic field constraint at the detection point, and to acquire the magnetic induction intensity of the sample before and after it is placed at the detection point. The element content calculation unit is used to calculate the intensity ratio of the corresponding spectral lines of metallic and non-metallic elements in the plasma spectral data. Based on the intensity ratio of the corresponding metallic and non-metallic elements and the standard mapping curve of the metal, the content of the corresponding metallic and non-metallic elements is calculated. The standard mapping curve of the metallic and non-metallic elements is the mapping relationship between the intensity ratio of the spectral lines of metallic and non-metallic elements and the content of metallic and non-metallic elements in a standard sintered ore sample under laser ablation and magnetic field confinement. The metallic elements include at least iron, calcium, silicon, magnesium, and aluminum; the non-metallic elements include at least silicon. The first content calculation unit is used to calculate the first content of ferrous oxide based on the intensity ratio of iron in the metal element and the first standard mapping curve; wherein, the first standard mapping curve is the mapping relationship between the intensity ratio of iron spectral lines and the ferrous oxide content of a standard sintered ore sample under laser ablation and magnetic field confinement. The second content calculation unit is used to calculate the second content of ferrous oxide based on the change in magnetic induction intensity before and after the sample to be tested is placed at the detection point and the second standard mapping curve; wherein, the second mapping curve is the mapping relationship between magnetic induction intensity and ferrous oxide content of the standard sintered ore sample under laser ablation and magnetic field confinement. The generation unit is used to calculate the content of ferrous oxide in the sample to be tested based on the first content and the second content, and to generate the content of metal and non-metal elements and the content of ferrous oxide in the sample to be tested.

9. A device for detecting the composition of sintered ore, characterized in that, The method for detecting the composition of sintered ore as described in any one of claims 1 to 7, wherein the detection equipment comprises: Material conveying mechanism, used to carry and transport the sintered ore sample to be tested; A dichroic mirror is located on the emitting side of the laser. The first focusing lens has its incident surface facing the coated surface of the dichroic mirror and its exit surface facing the sample to be tested on the material conveying mechanism; wherein, the pulsed laser emitted by the laser passes through the dichroic mirror and the first focusing lens and is focused on the surface of the sample to be tested for ablation. The second focusing lens has its incident surface facing the coated surface of the dichroic mirror; The spectrometer has its receiving end facing the exit surface of the second focusing lens; wherein, the plasma generated by the pulsed laser ablation of the sample under test is reflected by the dichroic mirror and passes through the second focusing lens, and then converges to the receiving end of the spectrometer, and the spectrometer acquires the plasma spectral data generated by the laser ablation of the sample under test.

10. The sinter composition detection device according to claim 9, characterized in that, The detection equipment also includes: At least two permanent magnets are respectively arranged on both sides of the path through which the material conveying mechanism transports the sample to be tested, and a detection point with a magnetic field area is formed between the permanent magnets located on both sides of the material conveying mechanism. A magnetic flux detection component is used to obtain the magnetic induction intensity of the sample before and after it is placed at the detection point.

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