Scrap material production equipment and scrap material production method

Abstract

Scrap material production equipment capable of producing a scrap material having clear component concentrations is provided.　The scrap material production equipment comprises: a shearing machine for shearing scrap into a scrap composition; a sorter for sorting the scrap composition to obtain a scrap material; a conveyor for conveying the scrap material to an analyzer; the analyzer, which is for examining the scrap material conveyed by the conveyor, for component concentration; and a controller for correcting the component concentrations using calibration curves. The controller makes the correction using calibration curves for correction to component concentrations determined by chemically analyzing the scrap material that is molten.

Description

Manufacturing Equipment for Scrap Materials and Manufacturing Method for Scrap Materials

[0001] The present invention relates to manufacturing equipment and a manufacturing method for scrap materials with clear component concentrations.

[0002] From the perspective of effective utilization of resources, it is required to reuse waste iron scrap (hereinafter referred to as "scrap") as recyclable resources. Generally, scrap is classified into various classes according to weight, size, and origin. Scrap is extremely diverse in terms of purity, which is the proportion of iron contained in the scrap. The lower the proportion of iron contained in the scrap, the lower the quality of the scrap.

[0003] Scrap containing some elements, mainly copper and tin, is required to be removed as much as possible. The reason is that copper and tin are difficult to remove in the steelmaking process, and if the scrap contains an amount of copper or tin exceeding a specific threshold, it will cause defects and quality degradation in products classified as high-grade steel such as automotive steel sheets.

[0004] In the conventional manufacturing process of scrap, since the scrap was classified according to size and origin as described above, if the impurity concentration contained in the scrap is high, it may affect the quality of the steel produced. For example, it is known that if the amount of copper contained in the scrap is large, the ductility and strength of the steel produced will decrease. Therefore, it is required to measure the component concentration of the scrap and determine the optimal usage amount of the scrap for the next steelmaking process.

[0005] Patent Document 1 discloses a plant and a method for classifying scrap based on component concentration. This plant and method include a shearing machine for cutting the scrap, an analysis device for analyzing the chemical composition of the sheared material, and a discharge system for separating the analyzed material according to its component concentration. According to Patent Document 1, classification based on the component concentration of the scrap becomes possible, and it is stated that the quality of the steel produced can be improved.

[0006] Japanese Patent Publication No. 2024-506688

[0007] Patent Document 1 describes measuring the component concentration of scrap using an XRF analyzer, a LIBS analyzer, or a neutron activation analyzer. However, there was a problem in that these analytical methods could not measure the component concentration of scrap with high accuracy even when analyzing scrap that was being continuously transported on a conveyor belt.

[0008] This invention was made in view of the problems of the prior art, and its purpose is to provide scrap material manufacturing equipment and a manufacturing method that can measure the component concentration of scrap material continuously transported by a conveyor belt with high precision and produce scrap material with a known component concentration.

[0009] The means for solving the above problems are as follows: [1] A scrap material manufacturing facility comprising: a shearing machine for shearing scrap to make a scrap composition; a sorting machine for sorting the scrap composition to make scrap material; a transporting device for transporting the scrap material to an analytical device; an analytical device for measuring the component concentration of the scrap material transported by the transporting device; and a control device for correcting the component concentration using a calibration curve, wherein the control device corrects the component concentration using a calibration curve that corrects the component concentration to that measured by chemically analyzing the molten scrap material. [2] The scrap material manufacturing facility according to [1], wherein the analytical device measures the component concentration in an area of ​​50% or more of the transported scrap material in the width direction of the transporting device. [3] The scrap material manufacturing equipment according to [1] or [2], wherein the sorting machine comprises an air separator that removes lightweight impurities from the scrap composition by air force and a magnetic separator that sorts the scrap composition into magnetic and non-magnetic materials, and the analytical device measures the component concentration of the scrap material from which the lightweight impurities and non-magnetic materials have been removed. [4] The scrap material manufacturing equipment according to any one of [1] to [3], wherein the control device determines the amount of scrap material used to manufacture the molten steel using the corrected component concentration, the amount of molten steel to be manufactured in the next process, and the target component concentration of the molten steel. [5] A scrap material manufacturing facility comprising: a shearing machine for shearing scrap into a scrap composition; a sorting machine for sorting the scrap composition into scrap material; a conveying device for transporting the scrap material to an analytical device; an analytical device for measuring the component concentration of the scrap material transported by the conveying device; and a control device for determining the amount of scrap material to be used in the production of the molten steel, using the component concentration, the amount of molten steel to be produced in the next process, and the target component concentration of the molten steel.[6] A method for manufacturing scrap material, comprising: a shearing step of shearing scrap to make a scrap composition; a sorting step of sorting the scrap composition to make scrap material; a transporting step of transporting the scrap material to an analytical device; an analysis step of measuring the component concentration of the transported scrap material with the analytical device; and a correction step of correcting the component concentration using a calibration curve, wherein the correction step is performed using a calibration curve that corrects the component concentration to the component concentration measured by chemical analysis of the molten scrap material. [7] The method for manufacturing scrap material according to [6], wherein the analysis step measures the component concentration in a region of 50% or more of the transported scrap material in the width direction perpendicular to the transport direction of the transporting step. [8] The method for manufacturing scrap material according to [6] or [7], wherein the sorting step includes an air sorting step of removing lightweight impurities from the scrap composition by air force and a magnetic sorting step of sorting the scrap composition into magnetite and non-magnetite, and the analysis step measures the component concentrations of the scrap material from which the lightweight impurities and non-magnetite have been removed. [9] The method for manufacturing scrap material according to any one of [6] to [8], wherein the thickness of the scrap material transported in the transport step is 100 mm or less.

[10] The method for manufacturing scrap material according to any one of [6] to [9], further comprising a usage amount determination step of determining the amount of scrap material to be used in the production of the molten steel using the corrected component concentrations, the amount of molten steel to be produced in the next step, and the target component concentration of the molten steel.

[11] A method for manufacturing scrap material, comprising: a shearing step of shearing scrap to make a scrap composition; a sorting step of sorting the scrap composition to make scrap material; a transporting step of transporting the scrap material to an analytical device; an analytical step of measuring the component concentration of the transported scrap material with the analytical device; and a usage amount determination step of determining the amount of scrap material to be used in the next step using the component concentration, the amount of molten steel to be manufactured in the next step, and the target component concentration of the molten steel.

[0010] In the scrap material manufacturing equipment and manufacturing method according to the present invention, the component concentrations of the scrap material measured by an analytical instrument are corrected using a calibration curve. In this way, the component concentrations of the scrap material are corrected to the component concentrations obtained by chemically analyzing the melted scrap material, so that the component concentrations of the scrap material can be measured with high accuracy, and scrap material with clearly defined component concentrations can be manufactured.

[0011] Figure 1 is a schematic diagram showing an example of the configuration of the scrap material manufacturing equipment according to this embodiment. Figure 2 is a schematic diagram showing an example of the configuration of the control device. Figure 3 is a flowchart showing the flow of the scrap material manufacturing method according to this embodiment.

[0012] The present invention will be described in detail below through embodiments of the present invention. The following embodiments are preferred examples of the present invention, and the present invention is not limited in any way by these embodiments. Figure 1 is a schematic diagram showing an example of the configuration of a scrap material manufacturing facility 100 according to this embodiment.

[0013] The scrap material manufacturing equipment 100 according to this embodiment includes a shredder machine 12, an air separator 13, a magnetic separator 14, an analysis device 16, and a control device 18. The shredder machine 12 is a device that shreds scrap collected from a scrap yard to create a scrap composition. Among the scrap piled up in the scrap yard, steel bars and wire rods contain a large amount of copper, so it is preferable not to shred them with the shredder machine 12. The shredder machine 12 is an example of a shearing machine.

[0014] The shredder machine 12 includes a hopper into which scrap is fed, a bottom plate and a top plate with adjustable height, and a shearing chamber inside which multiple rotating blades and hammers are provided. The hopper has a large opening. By adjusting the height of the bottom plate and top plate of the shearing chamber, the outlet area of ​​the scrap composition from the shearing chamber is adjusted. By adjusting the outlet area of ​​the shearing chamber, the average residence time of the scrap composition in the shearing chamber is adjusted. Preferably, the outlet area of ​​the shearing chamber can be adjusted from a predetermined size until the outlet is closed. This makes it possible to adjust the maximum particle size of the scrap composition and the apparent density of the scrap composition.

[0015] The shredder machine 12 has a rotor with shear blades. The rotor with shear blades is driven by an electric motor, and the output of the electric motor is preferably 2000 kW or more, more preferably 2400 kW or more, and even more preferably 2800 kW or more. The shredder machine 12 is preferably provided with a dust removal device, and the dust removal device is preferably a dry dust removal device that has a low environmental impact. The dry dust removal device preferably includes one or more activated carbon filters.

[0016] The scrap composition sheared by the shredder machine 12 is sorted by a sorting machine to become scrap material. In this embodiment, the sorting machine preferably includes an air separator 13 and a magnetic separator 14. The air separator 13 and the magnetic separator 14 remove lightweight impurities and non-metallic materials from the scrap composition to make it scrap material.

[0017] In the wind separator 13, air is blown onto the falling scrap composition at an airflow rate adjusted to blow away lightweight impurities contained in the scrap composition. This removes lightweight impurities such as plastic, rubber, paper, and wood chips contained in the scrap composition. It is preferable that the airflow rate from the blower of the wind separator 13 can be adjusted. In the wind separator 13, reducing the airflow rate increases the yield of scrap material, but also increases the impurity content. On the other hand, increasing the airflow rate from the blower decreases the yield of scrap material, but also lowers the impurity content. By adjusting the airflow rate of the wind separator 13, it is possible to adjust the balance between the impurity content and the yield.

[0018] The magnetic separator 14 separates the scrap composition into iron and non-iron materials, removing non-iron materials such as Cu, Al, SUS, and brass. For example, a drum-type magnetic separator can be used as the magnetic separator 14. In a drum-type magnetic separator, a drum with a built-in magnetic force generator is used, and the scrap composition is separated into iron and non-iron materials by utilizing the fact that the landing points of iron materials that magnetically adhere to the drum and non-iron materials that do not magnetically adhere to the drum are different.

[0019] Preferably, the magnetic separator 14 allows for adjustment of the magnitude of the magnetic force generated by the magnetic force generator. For example, if an electromagnet is incorporated as the magnetic force generator, the magnitude of the magnetic force generated by the magnetic force generator can be adjusted by controlling the current supplied to the electromagnet. Increasing the magnetic force of the magnetic force generator increases the yield of scrap material but also increases the impurity content. On the other hand, decreasing the magnetic force of the magnetic force generator decreases the yield but also lowers the impurity content. In this way, by adjusting the magnitude of the magnetic force of the magnetic force generator, it is possible to adjust the balance between the yield of scrap material and the impurity content.

[0020] Analytical equipment such as infrared spectroscopy (IR spectroscopy) or near-infrared spectroscopy (NIR spectroscopy) may be installed in the post-processing stage after the sorting machine (wind separator 13 and magnetic separator 14) to detect plastics and other materials contained in the scrap composition. This makes it possible to identify and remove plastics contained in the scrap composition from other materials.

[0021] The scrap material, from which lightweight impurities and non-magnetic materials have been removed by the sorting machine, is continuously transported by a conveyor belt to the analysis device 16, where its component concentrations are measured. In this embodiment, the conveyor belt is an example of a transport device.

[0022] In the scrap material manufacturing equipment 100 according to this embodiment, an X-ray fluorescence analyzer (RF-A) is used as the analytical device 16. The X-ray fluorescence analyzer creates vacancies in the inner shells of elemental atoms using X-rays of appropriate energy and intensity. Subsequently, these vacancies are reoccupied by electrons belonging to one of the outermost shells, and when these electrons are de-excited, photons (fluorescent X-rays) with energy equal to the energy difference between the electrons at their initial and final positions are generated. Since these fluorescent X-rays have element-specific energies, the component concentration of the scrap material can be measured from the intensity (number of photons) of the fluorescent X-rays.

[0023] X-ray fluorescence analyzers have excellent sensitivity for measuring important elements such as Cu, Ni, Cr, and Mn among impurities in scrap. Because X-ray fluorescence analyzers are compact, they can be easily installed near conveyor belts. Furthermore, X-ray fluorescence analyzers can measure heterogeneous and fast-moving objects. Therefore, for measuring the component concentrations of scrap materials, using an X-ray fluorescence analyzer is preferable to using neutron activation analysis.

[0024] The analyzer 16 measures the component concentration of scrap material by irradiating it with X-rays as it is continuously transported on a conveyor belt. The analyzer 16 continuously measures the component concentration of scrap material by irradiating it with X-rays as it is transported on a conveyor belt. In the analyzer 16, it is preferable to irradiate an area of ​​50% or more of the scrap material in the width direction perpendicular to the transport direction of the conveyor belt with X-rays and measure the component concentration of the scrap material in that area.

[0025] The scrap material, sheared by the shredder machine 12 and sorted by the sorting machine, has various shapes, resulting in variability in the measurement results of component concentrations. The inventors measured component concentrations under various measurement conditions, and also took samples from the measured scrap material, dissolved the scrap in a dissolving device, and performed chemical analysis to determine the preferred measurement conditions. As a result, it was found that in the analytical device 16, it is preferable to irradiate an area of ​​50% or more of the scrap material in the width direction of the conveying conveyor with X-rays and measure the component concentration of the scrap material in that area. By measuring the component concentration of an area of ​​50% or more of the scrap material in the width direction perpendicular to the conveying direction of the conveying conveyor, it becomes possible to measure the average component concentration of the entire scrap material.

[0026] On the other hand, if the area where the component concentration is measured is less than 50% of the scrap material in the width direction of the conveyor, it will result in a localized component concentration of the scrap material, making it impossible to measure the average component concentration of the entire scrap material, which is undesirable. It is more preferable that the area where the component concentration is measured by irradiating with X-rays is an area of ​​60% or more of the scrap material in the width direction perpendicular to the conveying direction of the conveyor.

[0027] It is preferable that the thickness of the scrap material transported by the conveyor belt be 100 mm or less. Since X-ray fluorescence analysis is a surface analysis, if the scrap material is thick, the internal scrap material cannot be analyzed for its components, and this portion of the scrap material becomes a factor in the variation of the component concentration. Therefore, a vibrating feeder is installed on the conveyor belt to reduce the thickness of the transported scrap material to 100 mm or less, thereby reducing this factor of variation. This improves the accuracy of measuring the component concentration of the scrap material by X-ray fluorescence analysis.

[0028] The analyzer 16 outputs the measured component concentrations of the scrap material to the control device 18. When the analyzer 16 has finished measuring the component concentrations of all the scrap materials, it outputs a signal to the control device 18 indicating that.

[0029] Scrap materials contain various components at various concentrations, and the accuracy of component analysis by the analytical device 16 differs depending on the component being measured. The component concentration of Cu, an important element for the analysis of scrap materials, is 0.1 to 1.0 mass%, and the component concentration of Mn is also 0.1 to 1.0 mass%. Since Cu and Mn are present in high concentrations in scrap materials, their component concentrations can be measured with high accuracy even in a short time. For this reason, the component concentrations of Cu and Mn can be measured in a short time, and if scrap materials with high concentrations of Cu or Mn are detected, those scrap materials may be removed within the analytical device 16.

[0030] On the other hand, for example, Sn, Ti, V, and Mo are hardly present in scrap material, so the concentration of these components cannot be measured with high accuracy in short-time measurements. When measuring such components, the measurement time may be extended. For example, the measurement time may be set to about 2 minutes, and the accuracy of measuring the concentration of these components may be improved by averaging the component concentration over 30 minutes.

[0031] The control device 18 stores the component concentrations of the scrap material, which are continuously measured by the analyzer 16, in its storage unit. When the control device 18 receives a signal from the analyzer 16 indicating that the measurement of the component concentrations of the scrap material has finished, it reads all the component concentrations from the storage unit and calculates the average component concentration of the scrap material. Once the control device 18 has determined the average component concentration of the scrap material, it corrects this average component concentration using a calibration curve. The calibration curve used to correct the component concentration is one that corrects the component concentration measured by X-ray fluorescence analysis to the component concentration measured by chemical analysis of the molten scrap material.

[0032] A calibration curve for correcting component concentrations measured by X-ray fluorescence analysis is created by the following steps 1 to 4: 1. A portion of the scrap material is collected after it has been sheared by the shredder machine 12 under the same conditions, and after lightweight impurities and non-metallic materials have been removed by the air separator 13 and magnetic separator 14 under the same conditions. 2. The collected scrap material is heated and melted, and the molten scrap material is chemically analyzed to obtain the component concentrations of the molten scrap material. 3. The scrap material being transported on the conveyor belt is measured with an X-ray fluorescence analyzer to obtain the component concentrations of the scrap material. 4. A calibration curve is calculated to correct the component concentrations measured by X-ray fluorescence analysis to the component concentrations measured by chemical analysis, using the average component concentration measured by X-ray fluorescence analysis and the component concentrations measured by chemical analysis of the molten scrap material.

[0033] Chemical analysis of molten scrap material is preferably performed using ISP emission spectrometry or atomic absorption spectrometry. Chemical analysis of trace components such as Sn may be performed using ICP-MS (mass spectrometry). Furthermore, chemical analysis of molten scrap material may be performed using Spark Optical Emission Spectroscopy (SparkOES), which is used in steelmaking plants. When creating a calibration curve for components such as Cu, whose concentration fluctuates depending on foreign matter mixed into the scrap material, it is preferable to melt and chemically analyze 1 ton or more of scrap material. This improves the accuracy of correction using the calibration curve.

[0034] The control device 18 corrects the average component concentration and stores the corrected component concentration in a database, linking it to the manufacturing lot number of the scrap material. The manufactured scrap material is transported lot by lot and stored in a predetermined location. In this way, scrap material with a known component concentration is manufactured using the scrap material manufacturing equipment 100 according to this embodiment. Preferably, the control device 18 uses the corrected component concentration, the amount of molten steel to be manufactured in the next process, and the target component concentration of the molten steel to determine the amount of scrap material to be used in the production of molten steel in the next process.

[0035] Next, the control device 18 will be described. Figure 2 is a schematic diagram showing an example of the configuration of the control device 18. The control device 18 is a general-purpose computer such as a workstation or personal computer. The control device 18 has a control unit 20, an input unit 22, an output unit 24, a storage unit 26, and a communication unit 28. The control unit 20 is, for example, a CPU, and functions as a correction unit 30 and a scrap usage amount determination unit 32 by executing a program stored in the storage unit 26.

[0036] The input unit 22 is, for example, a keyboard, a touch panel integrated with a display, etc. The output unit 24 is, for example, an LCD or CRT display, etc. The storage unit 26 is, for example, an information recording medium such as a flash memory that can be updated, a hard disk that is built-in or connected via a data communication terminal, a memory card, etc., and a device for reading and writing them. The storage unit 26 stores programs, data, calibration curves, and a database for realizing each function of the control device 18. The database records the corrected component concentrations of the scrap material, linked to the manufacturing lot number of the scrap material. The communication unit 28 includes at least one of a communication module that supports wired communication and a communication module that supports wireless communication. The control device 18 communicates with the analyzer 16 via the communication unit 28.

[0037] Next, the processes performed by the correction unit 30 and the scrap usage determination unit 32 will be described. The correction unit 30 acquires component concentration data of the scrap material from the analyzer 16 via the communication unit 28 and stores it in the storage unit 26. When the correction unit 30 detects that all component concentration data for scrap material of the same manufacturing lot has been stored in the storage unit 26 from the analyzer 16, it reads all the component concentration data from the storage unit 26 and calculates the average component concentration of the scrap material. After calculating the average component concentration, the correction unit 30 reads a calibration curve from the storage unit 26 and corrects the average component concentration using the calibration curve. The correction unit 30 associates the corrected component concentration with the manufacturing lot number of the scrap material and records it in the database of the storage unit 26. In this way, scrap material with known component concentrations is manufactured using the control device 18.

[0038] The correction unit 30 preferably determines the effectiveness rate, which is the proportion of the effective spectrum at the time the scrap material was loaded onto the conveyor belt among the total spectra measured by X-ray fluorescence analysis for the component concentration data. The effectiveness rate may be determined by comparing the component concentration data of the scrap material measured separately with the component concentration data obtained by X-ray fluorescence analysis.

[0039] If the thickness of the scrap material transported by the conveyor belt is set to 100 mm or less, there may be times when no scrap material is present on the conveyor belt. For this reason, it is preferable to determine the effectiveness rate, which is the percentage of the effective spectrum that was present in the scrap material when it was loaded onto the conveyor belt, and to consider component concentration data with a low effectiveness rate as having insufficient sample volume and not use such data in calculating the average component concentration of the scrap material. This allows measurement results with a high effectiveness rate, i.e., a high percentage of effective spectrum, to be reflected in the average component concentration of the scrap material. It is preferable for the correction unit 30 to use component concentration data with an effectiveness rate of 50% or more.

[0040] When the scrap usage determination unit 32 receives an input instruction from the input unit 22 to determine the amount of scrap material to be used, it obtains the molten steel production amount and target component concentration, which are the production conditions for molten steel, from the process computer for the next process. The scrap usage determination unit 32 uses the molten steel production amount, target component concentration and component concentration of the scrap material to determine the amount of scrap material to be used in the production of molten steel in the next process.

[0041] The scrap usage determination unit 32 may determine the amount of scrap material to be used based on the target copper concentration, which is difficult to adjust in the steelmaking process. For example, if the target value of the copper concentration is 0.1% by mass or less, the scrap usage determination unit 32 uses the amount of molten steel produced, the target copper concentration, and the copper concentration of the scrap material to determine the amount of scrap material to be used in the next process of molten steel production.

[0042] Specifically, the scrap usage determination unit 32 calculates the allowable amount of copper in the molten steel by multiplying the amount of molten steel produced by the upper limit of the copper concentration in the molten steel, which is 0.1 mass%. Next, it determines the amount of scrap material to be used by dividing the allowable amount of copper by the copper content of the scrap material. The scrap usage determination unit 32 uses copper-free materials such as reduced iron or pig iron to make up for any shortage of scrap material relative to the amount of molten steel produced. In this way, the scrap usage determination unit 32 may also determine the amount and blend of scrap raw materials to be used in the production of molten steel in the next process.

[0043] As described above, in the scrap material manufacturing equipment 100 according to this embodiment, the component concentrations of the scrap material measured by the analytical device 16 are corrected using a calibration curve. As a result, the component concentrations of the scrap material are corrected to the component concentrations obtained by chemically analyzing the melted scrap material, so that the component concentrations of the scrap material can be measured with high accuracy and scrap material with known component concentrations can be manufactured. Since the component concentrations of the scrap material are known, these component concentrations can be used to determine the amount and blend of scrap material to be used in the subsequent process of molten steel production.

[0044] Embodiments of the present invention are not limited to the above embodiments and various modifications can be made. The control device 18 may adjust the sorting conditions of the sorter using the component concentrations of the scrap materials acquired from the analysis device 16. For example, when the copper component concentration among the component concentrations of the scrap materials is higher than the predetermined target copper component concentration, the impurity concentration of the scrap materials may be reduced by weakening the magnetic force in the magnetic separator or strengthening the wind force in the air classifier. Thereby, the component concentration of the scrap materials can be made closer to the target component concentration.

[0045] On the other hand, when the copper component concentration among the component concentrations of the scrap materials is lower than the predetermined target copper component concentration, the control device 18 may increase the magnetic force in the magnetic separator or weaken the wind force in the air classifier to increase the yield of the scrap materials. Thereby, the production volume of the scrap materials can be increased while keeping the component concentration of the scrap materials within the range of the target component concentration.

[0046] Although an example in which the control device 18 has the scrap usage determination unit 32 has been shown, the present invention is not limited to this. If scrap materials with clear component concentrations are to be produced, the control device 18 may not have the scrap usage determination unit 32. When the scrap production process and the subsequent melting process are spatially separated, the function of the scrap usage determination unit 32 may be included in another control device.

[0047] FIG. 3 is a flowchart showing the flow of the method for manufacturing a scrap material according to the present embodiment. Using FIG. 3, the method for manufacturing a scrap material according to the present embodiment will be described. In the component concentration correction step (step S106) and the usage determination step (step S107) in the method for manufacturing a scrap material shown in FIG. 3, they may be performed by the control device 18 or by an operator.

[0048] First, a shearing process is performed to shear the scrap with a shredder machine 12 into a scrap composition (step S101). A wind separation process is performed to perform wind separation on the scrap composition sheared in the shearing process using a wind separator 13 (step S102). Thereby, lightweight impurities such as plastic, rubber, paper, and wood chips contained in the scrap composition can be removed.

[0049] Next, a magnetic separation process is performed to perform magnetic separation on the scrap composition using a magnetic separator 14 (step S103). Thereby, non-ferrous metals such as Cu, Al, SUS, and brass contained in the scrap composition can be removed.

[0050] A conveying process is performed to convey the scrap material from which impurities have been removed by a sorting process including a wind separation process and a magnetic separation process to an X-ray fluorescence analyzer (RF-A) using a conveying conveyor (step S104).

[0051] An analysis process is performed to irradiate the continuously conveyed scrap material with X-rays using an X-ray fluorescence analyzer (RF-A) and continuously measure the component concentration of the scrap material (step S105). The average value of the component concentration of the scrap material continuously measured by performing the analysis process is used as the component concentration of the scrap material.

[0052] A correction process is performed to correct the average component concentration of the scrap material using a calibration curve (step S106). The calibration curve used in the correction process is a calibration curve that corrects the average component concentration measured using an X-ray fluorescence analyzer (RF-A) to the component concentration measured by chemically analyzing the molten scrap material. The corrected average component concentration is recorded as the component concentration of the produced scrap material. In this way, a scrap material with a clear component concentration is produced.

[0053] A usage amount determination process is performed to determine the usage amount of the scrap material to be used in the production of molten steel in the next process using the component concentration corrected in step S106 (step S107). The usage amount of the scrap material is determined using the corrected component concentration of the scrap material, the production amount of the molten steel to be produced in the next process, and the target component concentration of the molten steel.

[0054] The flow chart in Figure 3 shows an example that includes a usage amount determination step (step S107) for determining the amount of scrap material to be used in the next process of molten steel production, but it is not limited to this. If the method for manufacturing scrap material only involves manufacturing scrap material with known component concentrations, the usage amount determination step (step S107) does not need to be included.

[0055] 10 Scrap yard 12 Shredder machine 13 Wind separator 14 Magnetic separator 16 Analysis device 18 Control device 20 Control unit 22 Input unit 24 Output unit 26 Storage unit 28 Communication unit 30 Correction unit 32 Scrap usage amount determination unit

Claims

1. A scrap material manufacturing apparatus comprising: a shearing machine for shearing scrap into a scrap composition; a sorting machine for sorting the scrap composition into scrap material; a conveying device for transporting the scrap material to an analytical device; an analytical device for measuring the component concentration of the scrap material transported by the conveying device; and a control device for correcting the component concentration using a calibration curve, wherein the control device corrects the component concentration using a calibration curve that corrects the component concentration to that measured by chemical analysis of the molten scrap material.

2. The scrap material manufacturing apparatus according to claim 1, wherein the analytical device measures the component concentration in an area of ​​50% or more of the scrap material being transported in the width direction of the transport device.

3. The scrap material manufacturing equipment according to claim 1 or 2, wherein the sorting machine comprises an air separator for removing lightweight impurities from the scrap composition by air force, and a magnetic separator for separating the scrap composition into magnetic and non-magnetic materials, and the analytical device measures the component concentrations of the scrap material from which the lightweight impurities and non-magnetic materials have been removed.

4. The scrap material manufacturing apparatus according to any one of claims 1 to 3, wherein the control device determines the amount of scrap material to be used in the production of the molten steel using the corrected component concentration, the amount of molten steel to be produced in the next process, and the target component concentration of the molten steel.

5. A scrap material manufacturing facility comprising: a shearing machine for shearing scrap into a scrap composition; a sorting machine for sorting the scrap composition into scrap material; a conveying device for transporting the scrap material to an analytical device; an analytical device for measuring the component concentration of the scrap material transported by the conveying device; and a control device for determining the amount of scrap material to be used in the production of the molten steel, using the component concentration, the amount of molten steel to be produced in the next process, and the target component concentration of the molten steel.

6. A method for producing scrap material, comprising: a shearing step of shearing scrap to form a scrap composition; a sorting step of sorting the scrap composition to form scrap material; a transporting step of transporting the scrap material to an analytical device; an analysis step of measuring the component concentrations of the transported scrap material with the analytical device; and a correction step of correcting the component concentrations using a calibration curve, wherein the correction step is performed using a calibration curve that corrects the component concentrations to those measured by chemical analysis of the molten scrap material.

7. The method for producing scrap material according to claim 6, wherein in the analysis step, the component concentration is measured in a region of 50% or more of the scrap material being transported in the width direction perpendicular to the transport direction of the transport step.

8. The method for producing scrap material according to claim 6 or 7, wherein the sorting step includes an air separation step for removing lightweight impurities from the scrap composition by air force, and a magnetic separation step for separating the scrap composition into magnetite and non-magnetite materials, and the analysis step measures the component concentrations of the scrap material from which the lightweight impurities and non-magnetite materials have been removed.

9. The method for manufacturing scrap material according to any one of claims 6 to 8, wherein the thickness of the scrap material conveyed in the conveying step is 100 mm or less.

10. A method for manufacturing scrap material according to any one of claims 6 to 9, further comprising a step of determining the amount of scrap material to be used in the next step, using the corrected component concentrations, the amount of molten steel to be produced in the next step, and the target component concentrations of the molten steel.

11. A method for manufacturing scrap material, comprising: a shearing step of shearing scrap to form a scrap composition; a sorting step of sorting the scrap composition to form scrap material; a transporting step of transporting the scrap material to an analytical device; an analytical step of measuring the component concentrations of the transported scrap material with the analytical device; and a usage amount determination step of determining the amount of scrap material to be used in the next step using the component concentrations, the amount of molten steel to be produced in the next step, and the target component concentration of the molten steel.

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