Ore separation system and method based on induction heating technology

Abstract

The invention provides an ore separation system and method based on an induction heating technology, and relates to the technical field of ore separation, the ore separation system comprises a feeding device, a first heating device, a transportation device, a detection and recognition device and a separation device; the discharging end of the feeding device communicates with the feeding end of the first heating device so as to feed materials to the first heating device. The first heating device is used for generating an alternating magnetic field to heat conductor minerals, and the discharging end of the first heating device communicates with the feeding end of the conveying device. The detection and recognition device is located above the transportation device to obtain mineral position and category information according to the mineral temperature difference; the separating device is located on the downstream of the detecting and recognizing device in the conveying direction of the conveying device and used for discharging the high-grade minerals and / or the low-grade minerals out of the conveying device. The ore sorting system has no requirement for the size of the recognized ore and is not affected by atomic numbers of substances, meanwhile, sorting is not radiative, and a high protection level is not needed.

Description

Technical Field

[0001] This invention relates to the field of ore sorting technology, and in particular to an ore sorting system and method based on induction heating technology. Background Technology

[0002] Pre-selection and waste disposal is a crucial step in modern mining production. It aims to identify and remove large amounts of waste rock and low-grade minerals from the raw ore beforehand, increasing the proportion of useful minerals. This reduces the workload of subsequent processes (such as grinding and flotation), lowers production costs, and improves economic efficiency. Based on different mineral characteristics, pre-selection and waste disposal technologies are mainly divided into several methods, including manual sorting, photoelectric separation, gravity separation, and magnetic separation.

[0003] Currently, X-ray transmission technology is widely used for the sorting of metal ores. X-ray sorting machines (also known as photoelectric sorting machines, sorting machines, etc.) analyze the raw ore by analyzing the energy spectrum characteristics of the imaging based on the different absorption rates of X-rays of different substances. They calculate the content of mineral particles in the raw ore, classify each piece of ore, and then selectively remove waste rock and low-grade minerals through mechanical devices to reduce the amount of ore entering the sorting process in subsequent operations.

[0004] X-ray transmission sorting has high accuracy and good identification effect on mineral particles embedded inside ores, but it has the following problems: 1. There are certain requirements regarding the size of the ores to be identified. Under the condition that the voltage and current of the X-ray generator are constant, X-rays cannot penetrate larger ores, while for smaller ores, the X-ray image is overexposed, affecting the identification effect.

[0005] 2. The absorption of X-rays by a substance is related to its atomic number. X-rays attenuate significantly when penetrating minerals with high atomic numbers (such as tungsten, lead, and tin), making them easy to identify. However, the attenuation is not significant when penetrating minerals with low atomic numbers (such as iron) (similar to the attenuation pattern of gangue minerals), resulting in poor identification. Therefore, when the atomic number of a mineral particle is close to that of gangue, the distinguishability of the two substances overlaps, making identification difficult.

[0006] 3. X-ray sorting is radioactive, and sorting equipment requires a high level of protection. Summary of the Invention

[0007] The purpose of this invention is to provide an ore sorting system and method based on induction heating technology, which has no requirements on the size of the ore being identified, is not affected by the atomic number of the material, and the sorting is non-radioactive and does not require a high level of protection.

[0008] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides an ore sorting system based on induction heating technology, including a feeding device, a first heating device, a transport device, a detection and identification device, and a separation device; The unloading end of the feeding device is connected to the feeding end of the first heating device to feed material to the first heating device; The first heating device is used to generate an alternating magnetic field to heat the conductive mineral, and the unloading end of the first heating device is connected to the feeding end of the conveying device; The detection and identification device is located above the transport device to obtain mineral location and category information based on mineral temperature differences; The separation device is located downstream of the detection and identification device along the transport direction of the transport device, and the separation device is used to discharge high-grade minerals and / or low-grade minerals from the transport device.

[0009] In an optional embodiment, the discharge end of the feeding device is higher than the feed end of the transport device, and the first heating device is tilted to discharge the mineral to the transport device under the action of gravity.

[0010] In an optional embodiment, the first heating device includes a protective shell and a first coil connected to the protective shell, the first coil being used to generate an alternating magnetic field, the protective shell forming a channel for minerals to pass through, the channel having a feed end and a discharge end, the feed end having an opening that gradually increases in the direction of gradually approaching the feeding device.

[0011] In an optional embodiment, the separation device includes a frame, a drive mechanism, and a separating element. The drive mechanism is mounted on the frame and connected to the separating element. The drive mechanism is used to drive the separating element to reciprocate along a transport direction perpendicular to the transport device.

[0012] In an optional embodiment, a concentrate bin is provided on the side of the transport device, and a tailings bin is provided at the unloading end of the transport device. The separation device is used to transfer the high-grade mineral from the side of the transport device to the concentrate bin.

[0013] In an optional embodiment, the ore sorting system based on induction heating technology further includes a second heating device for generating an alternating magnetic field to heat the conductor mineral. The second heating device is sleeved outside the transport device and is located between the feed end of the transport device and the detection and identification device.

[0014] Secondly, the present invention provides an ore sorting method, employing an ore sorting system based on induction heating technology as described in any of the foregoing embodiments, comprising: The feeding device feeds material to the first heating device. Conductive minerals are heated when they pass through the first heating device, while non-conducting minerals are not heated when they pass through the first heating device. The transport device receives the mineral discharged by the first heating device, and the second heating device outside the transport device reheats the conductor mineral; The heated conductive mineral passes through the detection and identification device, which transmits the data to a computer system. The computer system performs temperature image analysis on the mineral and obtains the location and category information of the mineral based on the temperature difference of the mineral. The controller controls the separation device to transfer the high-grade minerals to the concentrate bin based on the location and type information of the minerals, while the low-grade minerals fall into the tailings bin by a horizontal throwing motion at the tail end of the transport device.

[0015] In an optional implementation, it further includes: The detection and identification device collects infrared thermal imaging data of several minerals after induction heating, and establishes a sorting model based on the infrared thermal imaging data; The sorting model includes a location detection model and a category detection model.

[0016] In an optional implementation, establishing the location detection model specifically includes: Infrared thermal imaging data of the mineral after induction heating is collected, the mineral particles are labeled with their positions, and a training sample set is established. Using the training sample set, a target detection model is constructed to obtain the position coordinates of the mineral particles.

[0017] In an optional implementation, the category detection model is established, specifically including: The location coordinates of the mineral are obtained according to the location detection model, and the temperature image of a single mineral particle is extracted from the image. The real-time temperature of mineral particles is converted into a temperature-grayscale image using the following formula. Then, threshold segmentation is performed to remove the background, and the pixel value of the background is set to 0;

[0018] in, This represents the lowest temperature of the mineral particles. This represents the highest temperature of the mineral particles. This represents the real-time temperature of the mineral particles. The grayscale histogram of the temperature-grayscale image of the sampled mineral is statistically analyzed, and the grayscale threshold parameter corresponding to the high-grade mineral is determined based on the temperature-grayscale histogram of the sampled mineral. Based on the determined threshold parameters, pixels above the threshold are replaced with a pixel value of 255, and pixels below the threshold are replaced with a pixel value of 100. Background pixel values ​​remain at 0. The statistical value is the proportion of 255 pixels to the total number of mineral pixels. ;

[0019] in: The number of pixels exceeding the threshold; The number of pixels below the threshold; Determine the sorting threshold based on the proportion. The calculation method is as follows:

[0020] The computer system transmits the determined mineral particle coordinates and category information to the separation device via the UDP network protocol for sorting.

[0021] The ore sorting system and method based on induction heating technology provided by this invention can produce the following beneficial effects: The ore sorting system based on induction heating technology provided by this invention is designed with a first heating device capable of generating an alternating magnetic field. Utilizing the conductivity of metallic minerals, the magnetic field changes in the alternating magnetic field induce a circular current. The current generates Joule heating through the resistance of the material. A detection and identification device distinguishes between high-grade and low-grade minerals based on temperature image differences. The two are then separated by a separation device, thus achieving ore sorting.

[0022] Compared with existing technologies, the ore sorting system based on induction heating technology provided by this invention has no requirements on the size of the ore being identified, is not affected by the atomic number of the material, and the sorting is not radioactive, so the sorting equipment does not require a high level of protection.

[0023] The ore sorting method provided in the second aspect of the present invention adopts the ore sorting system based on induction heating technology provided in the first aspect of the present invention, thereby having all the beneficial effects of the ore sorting system based on induction heating technology provided in the first aspect of the present invention. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1This is a schematic diagram of the structure of an ore sorting system based on induction heating technology provided in an embodiment of the present invention; Figure 2 A perspective view of a first heating device provided in an embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the principle of the ore sorting method provided in an embodiment of the present invention.

[0026] Icons: 1-Feeding device; 2-First heating device; 21-Protective shell; 22-First coil; 3-Transportation device; 4-Detection and identification device; 5-Separation device; 51-Frame; 52-Drive mechanism; 53-Separating component; 6-Concentrate bin; 7-Tailure bin; 8-Second heating device; 9-AC power supply; 10-Computer system. Detailed Implementation

[0027] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0031] A first aspect of the present invention provides an ore sorting system based on induction heating technology, such as... Figure 1 and Figure 2 As shown, it includes a feeding device 1, a first heating device 2, a conveying device 3, a detection and identification device 4, and a separation device 5; The unloading end of the feeding device 1 is connected to the feeding end of the first heating device 2 to feed material to the first heating device 2; The first heating device 2 is used to generate an alternating magnetic field to heat the conductor mineral, and the unloading end of the first heating device 2 is connected to the feeding end of the conveying device 3. The detection and identification device 4 is located above the transport device 3 to obtain mineral location and category information based on mineral temperature differences; The separation device 5, located downstream of the detection and identification device 4, is positioned along the transport direction of the transport device 3. The separation device 5 is used to discharge high-grade minerals and / or low-grade minerals from the transport device 3.

[0032] When using the above-mentioned ore sorting system based on induction heating technology, the feeding device 1 transports the minerals to the first heating device 2. Since the first heating device 2 can generate an alternating magnetic field, the change in magnetic field will induce a circular current (i.e., eddy current) by utilizing the conductivity of metallic minerals. According to the principle that the current generates Joule heating through the resistance of conductive minerals, while non-conductive minerals do not generate Joule heating, the temperature of the conductive minerals rises. The minerals fall onto the transport device 3 after passing through the first heating device 2. The detection and identification device 4 distinguishes between high-grade minerals with higher temperatures and low-grade minerals with lower temperatures based on the temperature image differences. Finally, the two are separated by the separation device 5, thus realizing the ore sorting.

[0033] The ore sorting system based on induction heating technology provided by the first aspect of the present invention has no requirements on the size of the ore being identified, is not affected by the atomic number of the material, and the sorting is not radioactive, so the sorting equipment does not require a high level of protection.

[0034] It should be noted that any structure capable of feeding material to the first heating device 2 can be the feeding device 1 provided in the above embodiments. For example, the feeding device 1 may include a vibrating feeder or a screw feeder.

[0035] In a preferred embodiment, the feeding device 1 includes a vibrating feeder.

[0036] In alternative implementations, such as Figure 1 As shown, the discharge end of the feeding device 1 is higher than the feed end of the transport device 3, and the first heating device 2 is inclined to discharge the minerals to the transport device 3 under the action of gravity.

[0037] The advantage of the above setup is that gravity can be used to move the minerals from the feed end to the discharge end of the first heating device 2, thus eliminating the need for a transport structure within the first heating device 2 and reducing equipment costs.

[0038] The first heating device 2 can be configured as one, two, three or even more. In other words, the number of the first heating devices 2 is not specifically limited, and the user can choose according to the amount of ore.

[0039] like Figure 1 As shown, there are two first heating devices 2, which are arranged side by side and in parallel. The ore is fed onto the transport device 3 through their respective discharge ports, forming two rows of ore on the transport device 3.

[0040] In alternative implementations, such as Figure 2 As shown, the first heating device 2 includes a protective shell 21 and a first coil 22 connected to the protective shell 21. The first coil 22 is used to generate an alternating magnetic field. The protective shell 21 is inclined and forms a channel for minerals to pass through.

[0041] The protective shell 21 can be made of ceramic wear-resistant material, and the tilt angle can be 45°; the first coil 22 is made of copper, the diameter of the spiral structure formed by the first coil 22 is 0.25m, and the power of a single first coil can be 2500W.

[0042] The first coil 22 can be wound around the outside of the protective shell 21. The first coil 22 is connected to the AC power supply 9. An additional protective layer can also be provided outside the first coil 22.

[0043] In an optional embodiment, the channel formed by the protective shell 21 has a feed end and a discharge end, with the feed end gradually increasing in size as it approaches the feeding device 1.

[0044] The above-described embodiment allows the feed end of the protective shell 21 to be funnel-shaped, facilitating the collection of minerals.

[0045] It should be noted that any structure that can transport minerals can be the transport device 3 provided in the above embodiments. For example, the transport device 3 may include a belt conveyor or a chute to transport minerals by gravity, etc.

[0046] In a preferred embodiment, the transport device 3 includes a belt transport mechanism, and the minerals at the unloading end of the first heating device 2 can fall directly onto the belt in the belt transport mechanism, with a belt speed of 1.5 m / s.

[0047] It should be noted that any structure capable of discharging high-grade minerals and / or low-grade minerals from the transport device 3 can be the separation device 5 mentioned in the above embodiments. For example, the separation device 5 may include a drive mechanism that discharges minerals from the transport device 3 by applying a thrust to the minerals, or a blowing mechanism that discharges minerals from the transport device 3 by blowing them, or a robotic arm that clamps minerals to discharge minerals from the transport device 3, and so on.

[0048] When the separation device 5 includes the above-mentioned drive mechanism, the drive mechanism can be a pusher cylinder, and the mineral can be discharged by the extension and retraction of the pusher cylinder. Alternatively, the drive mechanism can include a rotary motor and a plate connected to the rotary motor, and the mineral can be dropped by the rotation of the plate.

[0049] In alternative implementations, such as Figure 1 As shown, the separation device 5 includes a frame 51, a drive mechanism 52, and a separating component 53. The drive mechanism 52 is installed on the frame 51 and connected to the separating component 53. The drive mechanism 52 is used to drive the separating component 53 to move horizontally back and forth along the transport direction perpendicular to the transport device 3.

[0050] The frame 51 serves to support the drive mechanism 52. The drive mechanism 52 can drive the separating component 53 to move back and forth along the transport direction perpendicular to the transport device 3, so that the separating component 53 can push the target mineral off the transport device 3.

[0051] The drive mechanism 52 can be a pneumatic cylinder, a hydraulic cylinder, a linear motor, etc.

[0052] The separating component 53 includes a connecting rod and a separating plate. One end of the connecting rod can slide in a horizontal direction perpendicular to the transport device 3 with the frame 51, and the other end can be connected to the separating plate.

[0053] The above method enables the frame 51 to guide the movement of the deflector 53, bear the weight of the deflector 53, and ensure the stability of the deflector 53 during reciprocating movement.

[0054] like Figure 1 As shown, the deflector plate is trapezoidal, and the length of the side of the deflector plate closer to the transport device 3 is greater than the length of the side farther away from the transport device 3.

[0055] The deflector 53 can be configured as one, two, three or more, and its number can correspond to the number of the first heating devices 2. That is, each deflector 53 is used to deflect a mineral that the first heating device 2 has placed onto the transport device 3.

[0056] like Figure 1As shown, two disengaging components 53 are configured, one of which is used to disengage the target mineral from one row of minerals on the transport device 3, and the other is used to disengage the target mineral from another row of minerals on the transport device 3.

[0057] The target minerals mentioned above can be high-grade or low-grade minerals, such as... Figure 1 As shown, the target mineral is a high-grade mineral. A concentrate bin 6 is provided on the side of the transport device 3, and a tailings bin 7 is provided at the unloading end of the transport device 3. The separation device 5 is used to push the high-grade mineral from the side of the transport device 3 into the concentrate bin 6, and the low-grade mineral falls into the tailings bin 7 by a horizontal throwing motion from the tail end of the transport device 3.

[0058] In alternative implementations, such as Figure 1 As shown, in order to achieve better heating effect for the conductive minerals before they are transported to the detection and identification device 4, and to avoid the conductive minerals cooling down significantly before reaching the detection and identification device 4 due to environmental factors, the ore sorting system based on induction heating technology also includes a second heating device 8 for generating an alternating magnetic field to heat the conductive minerals. The second heating device 8 is fitted outside the transport device 3 and is located between the feed end of the transport device 3 and the detection and identification device 4.

[0059] The second heating device 8 includes a second coil, which is made of copper. The diameter of the spiral structure formed by the second coil is 1.2m, and the power is 3000W.

[0060] The second coil is used for continuous heating and heat preservation of the minerals, increasing the temperature difference between conductive and non-conductive minerals, which can ensure that the identification results of the detection and identification device 4 are more accurate.

[0061] In an optional implementation, the ore sorting system based on induction heating technology also includes a computer system 10 and a controller connected to the computer system 10. The detection and identification device 4 includes an infrared camera connected to the computer system 10. The infrared camera collects the temperature of the heated minerals in real time and transmits the temperature thermal imaging data to the computer system 10. The computer system 10 outputs the location and category information of the ore through the sorting model. The controller is connected to the separation device 5.

[0062] During use, the minerals heated by the second heating device 8 pass through the detection and identification device 4 and the infrared camera to complete temperature imaging, and transmit the data to the computer system 10; the computer system 10 completes the ore temperature image analysis and obtains the mineral category and location information based on the temperature difference; the computer system 10 transmits the mineral category and location information to the controller, the controller controls the drive mechanism 52 to act, and the separating component 53 pushes the high-grade minerals to the concentrate bin 6, while the low-grade minerals fall into the tailings bin 7 by a horizontal projectile motion at the tail end of the transport device 3.

[0063] A second aspect of the present invention provides a method for ore sorting, such as... Figure 3 As shown, the ore sorting method provided in the second aspect of the present invention employs the above-described ore sorting system based on induction heating technology, and includes: The feeding device 1 feeds material to the first heating device 2. Conductive minerals are heated when they pass through the first heating device 2, while non-conducting minerals are not heated when they pass through the first heating device 2. The transport device 3 receives the minerals discharged from the first heating device 2, and the second heating device 8 outside the transport device 3 reheats the conductive minerals; The heated conductive mineral passes through the detection and identification device 4, which transmits the data to the computer system. The computer system performs temperature image analysis on minerals to obtain their location and category information based on temperature differences. The controller controls the separation device 5 to transfer high-grade minerals to the concentrate bin 6 based on the location and type of minerals, while low-grade minerals fall into the tailings bin 7 by a horizontal throwing motion at the tail end of the transport device 3.

[0064] The ore sorting method provided in the second aspect of the present invention adopts the ore sorting system based on induction heating technology provided in the first aspect of the present invention, thereby having all the beneficial effects of the ore sorting system based on induction heating technology provided in the first aspect of the present invention.

[0065] In an optional embodiment, the ore sorting method further includes: the detection and identification device 4 collects infrared thermal imaging data of several induction-heated minerals, and establishes a sorting model based on the infrared thermal imaging data; the sorting model includes a location detection model and a category detection model.

[0066] When establishing a location detection model, the location information of the ore can be obtained by using a deep learning target detection algorithm based on real-time collected infrared thermal imaging data.

[0067] Obtaining the location information of the ore specifically includes: S1 collects infrared thermal imaging data of minerals after induction heating, uses data augmentation (scaling, cropping, etc.) to expand the original dataset, and uses bounding rectangles to label the positions of iron ore particles in the infrared images to establish a training sample set. S2 uses a labeled training sample set to train a deep learning object detection framework (YOLOv8). After training, an object detection model is obtained, which obtains the coordinates of the bounding rectangle of the metal mineral particles (coordinates of the upper left and lower right points), that is, the ore location information. S3 obtains the coordinates of the bounding rectangle of the metal mineral particles based on the position detection model (the coordinates of the upper left and lower right of the bounding rectangle). ), ( Temperature images of individual iron ore particles were extracted from the original image. In addition, a classification model can be established by utilizing the principle that when a conductive mineral is in an alternating magnetic field, the change in the magnetic field will induce a circular current (i.e., eddy current). The current generates Joule heating through the resistance of the conductor, while non-conductive minerals do not generate Joule heating. A classification model can be established by using infrared camera temperature imaging to distinguish between high-grade and low-grade minerals.

[0068] Obtaining mineral category information specifically includes: The bounding rectangle coordinates of the mineral are obtained based on the location detection model. ), ( And extract the temperature images of individual mineral particles from the image; The real-time temperature of mineral particles is converted into a temperature-grayscale image using the following formula. Then, threshold segmentation is performed to remove the background, and the pixel value of the background is set to 0;

[0069] in, This represents the lowest temperature of the mineral particles. This represents the highest temperature of the mineral particles. This represents the real-time temperature of the mineral particles. Statistical analysis of the grayscale histogram of the temperature-grayscale image of the sampled minerals; and determination of the grayscale threshold parameter corresponding to high-grade minerals based on the temperature-grayscale histogram of the sampled minerals. Based on the determined threshold parameters, pixels above the threshold are replaced with a pixel value of 255, and pixels below the threshold are replaced with a pixel value of 100. Background pixel values ​​remain at 0. The statistical value is the proportion of 255 pixels to the total number of mineral pixels. ;

[0070] in: The number of pixels exceeding the threshold; The number of pixels below the threshold; Determine the sorting threshold based on the proportion. The calculation method is as follows:

[0071] The computer system transmits the determined mineral particle coordinates and category information to the separation device 5 via the UDP network protocol for sorting.

[0072] The steps for obtaining mineral category information described above will be specifically illustrated using a particular embodiment: The lowest temperature at which mineral particles are obtained. and highest temperature Real-time temperature Convert to grayscale-temperature image Based on the grayscale histogram of the grayscale-temperature image, the grayscale values ​​of the background and the ore region are determined. A segmentation threshold of 17 is then set to remove the background, with its pixel value set to 0. Different minerals heat to different temperatures; conductive metals are heated rapidly to higher temperatures, while non-metallic materials are not heated. This temperature difference is used for differentiation. In this example, imaging data of heated iron ore of different grades are analyzed, and a grayscale threshold parameter of 200 is determined for high-grade minerals. Subsequently, based on this threshold parameter, pixel values ​​above 200 are replaced with 255, and those below 200 are replaced with 100 (with background pixel values ​​remaining at 0). The statistical value is the proportion of 255 pixel values ​​to the total number of mineral pixels. In this example, 10 iron ore samples of different grades were selected, and the proportion of high-temperature regions was calculated. See Table 1 below for details (Proportion of High-Temperature Regions in Ore of Different Grades After Heating). Parameter calculation):

[0073] Determine the separation threshold based on the requirements of ore separation. See Table 2 below for details (different sorting thresholds) (Comparison of sorting results)

[0074] The industrial control computer will finally determine the coordinates of the mineral particles ( ), ( The information on the grade and category (1 represents high-grade ore, 0 represents low-grade ore) is transmitted to the control and execution mechanism via the UDP network protocol for sorting. High-grade minerals are retained, and low-grade minerals are removed.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ore sorting system based on induction heating technology, characterized in that, It includes a feeding device (1), a first heating device (2), a transport device (3), a detection and identification device (4), and a separation device (5); The unloading end of the feeding device (1) is connected to the feeding end of the first heating device (2) to feed material to the first heating device (2); The first heating device (2) is used to generate an alternating magnetic field to heat the conductor mineral, and the unloading end of the first heating device (2) is connected to the feeding end of the transport device (3); The detection and identification device (4) is located above the transport device (3) to obtain mineral location and category information based on mineral temperature differences; The separation device (5) is located downstream of the detection and identification device (4) along the transport direction of the transport device (3), and the separation device (5) is used to discharge high-grade minerals and / or low-grade minerals from the transport device (3).

2. The ore sorting system based on induction heating technology according to claim 1, characterized in that, The discharge end of the feeding device (1) is higher than the feed end of the transport device (3), and the first heating device (2) is inclined to discharge the mineral to the transport device (3) under the action of gravity.

3. The ore sorting system based on induction heating technology according to claim 1, characterized in that, The first heating device (2) includes a protective shell (21) and a first coil (22) connected to the protective shell (21). The first coil (22) is used to form an alternating magnetic field. The protective shell (21) forms a channel for minerals to pass through. The channel has a feed end and a discharge end. The feed end gradually increases in size along the direction that it is gradually approaching the feeding device (1).

4. The ore sorting system based on induction heating technology according to claim 1, characterized in that, The separation device (5) includes a frame (51), a drive mechanism (52) and a separating component (53). The drive mechanism (52) is installed on the frame (51) and connected to the separating component (53). The drive mechanism (52) is used to drive the separating component (53) to reciprocate along a transport direction perpendicular to the transport device (3).

5. The ore sorting system based on induction heating technology according to claim 1, characterized in that, The transport device (3) is provided with a concentrate bin (6) on its side, and the unloading end of the transport device (3) is provided with a tailings bin (7). The separation device (5) is used to transfer the high-grade mineral from the side of the transport device (3) to the concentrate bin (6).

6. The ore sorting system based on induction heating technology according to any one of claims 1-5, characterized in that, The ore sorting system based on induction heating technology also includes a second heating device (8) for generating an alternating magnetic field to heat the conductor mineral. The second heating device (8) is sleeved on the outside of the transport device (3) and is located between the feed end of the transport device (3) and the detection and identification device (4).

7. A method for ore sorting based on induction heating technology, characterized in that, The ore sorting system based on induction heating technology as described in any one of claims 1-6 includes: The feeding device (1) feeds material to the first heating device (2). Conductive minerals are heated when they pass through the first heating device (2), while non-conducting minerals are not heated when they pass through the first heating device (2). The transport device (3) receives the mineral discharged by the first heating device (2), and the second heating device (8) outside the transport device (3) reheats the conductor mineral; The heated conductive mineral is passed through the detection and identification device (4), which transmits the data to the computer system. The computer system performs temperature image analysis on the mineral and obtains the location and category information of the mineral based on the temperature difference of the mineral. The controller controls the separation device (5) to transfer the high-grade minerals to the concentrate bin (6) according to the location and category information of the minerals, and the low-grade minerals fall into the tailings bin (7) by a horizontal throwing motion at the tail end of the transport device (3).

8. The ore sorting method according to claim 7, characterized in that, Also includes: The detection and identification device (4) collects infrared thermal imaging data of several minerals after induction heating, and establishes a sorting model based on the infrared thermal imaging data; The sorting model includes a location detection model and a category detection model.

9. The ore sorting method according to claim 8, characterized in that, Establishing the location detection model specifically includes: Infrared thermal imaging data of the mineral after induction heating is collected, the mineral particles are labeled with their positions, and a training sample set is established. Using the training sample set, a target detection model is constructed to obtain the location coordinates of the mineral particles.

10. The ore sorting method according to claim 8, characterized in that, The establishment of the category detection model specifically includes: The location coordinates of the mineral are obtained according to the location detection model, and the temperature image of a single mineral particle is extracted from the image. The real-time temperature of mineral particles is converted into a temperature-grayscale image using the following formula. Then, threshold segmentation is performed to remove the background, and the pixel value of the background is set to 0; in, This represents the lowest temperature of the mineral particles. This represents the highest temperature of the mineral particles. This represents the real-time temperature of the mineral particles. The grayscale histogram of the temperature-grayscale image of the sampled mineral is statistically analyzed, and the grayscale threshold parameter corresponding to the high-grade mineral is determined based on the temperature-grayscale histogram of the sampled mineral. Based on the determined threshold parameters, pixels above the threshold are replaced with a pixel value of 255, and pixels below the threshold are replaced with a pixel value of 100. Background pixel values ​​remain at 0. The statistical value is the proportion of 255 pixels to the total number of mineral pixels. ; in: The number of pixels exceeding the threshold; The number of pixels below the threshold; Determine the sorting threshold based on the proportion. The calculation method is as follows: The computer system transmits the determined mineral particle coordinates and category information to the separation device (5) via the UDP network protocol for sorting.

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