Ore sorting equipment and ore identification method based on dual-energy XRT transmission technology

Abstract

The present invention provides an ore sorting device and an ore recognition method based on dual-energy XRT transmission technology, which relates to the field of ore dressing. The ore sorting device of the present invention mainly consists of a feed box, a rubber chute, a feeding roller, an imaging unit, a waste rock recognition system and a rejection system. The core is that multiple transmission images at different angles can be obtained through the rolling of ore particles in the rubber chute, and then the distribution of minerals in the ore particles can be accurately obtained through image analysis. The ore recognition method of the present invention is to analyze the transmission images of ore particles at different rolling angles, calculate the ratio of the volume of the target mineral or its associated ore body to the volume of the ore particle. If the volume ratio is greater than the sorting threshold, it is determined that the ore particle is an ore concentrate; if the volume ratio is greater than the sorting threshold, it is determined that the ore particle is waste rock. This ore recognition method using the volume ratio as the sorting threshold can truly reflect the ore content of the ore and will not cause misestimation of the ore grade.

Description

Technical Field

[0001] The present invention specifically relates to an ore sorting device and an ore recognition method based on dual-energy XRT transmission technology, and belongs to the technical field of ore dressing. Background Art

[0002] Newly mined ores contain a large amount of gangue and low-grade ores that have lost extraction value. For the sake of convenience, the above-mentioned gangue and low-grade ores are collectively referred to as waste rocks. The function of an ore sorting device is to separate waste rocks and only retain medium- and high-grade ores with extraction value. These medium- and high-grade ores include ores embedded or wrapped in gangue. The significance of ore sorting not only lies in energy conservation, environmental protection, cost reduction and efficiency improvement, but also has a profound impact on the sustainable utilization of resources. It is estimated that ore sorting can reduce energy consumption and tailings discharge by 30-50%, which is equivalent to reducing the ore dressing cost by 15-30% and greatly improving the resource utilization rate.

[0003] The working principle of an ore sorting device is to utilize the penetration characteristics of X-rays in different substances. The penetration characteristics of X-rays are related to the density, atomic number and thickness of minerals. X-rays have low penetration for minerals with high density or high atomic number (such as metal ores), and the detector can detect a relatively large gray-scale image; X-rays have high penetration for low-density minerals (such as quartz and gangue), and the detector can detect a relatively small gray-scale image.

[0004] Existing ore sorting devices mainly consist of a feed hopper, a conveyor belt, an X-ray source, a detector, an industrial camera, an image recognition and positioning tracking system, and a pneumatic gun blowing and sorting system. Ore particles are placed in the hopper. The function of the conveyor belt is to drive the ore particles forward. The functions of the X-ray source and the detector are to obtain the transmission image or fluorescence spectrum of the ore particles. The function of the image recognition and positioning tracking system is to identify, locate and track waste rocks. The function of the pneumatic gun blowing and sorting system is to sort out waste rocks. However, in actual use, it is found that existing ore sorting devices have the following defects:

[0005] 1. Existing ore sorting devices can only irradiate ore particles from a single angle, and the system cannot comprehensively obtain the three-dimensional distribution information of minerals in the ore particles, which may underestimate or overestimate the grade of the ore. For example, when high-density minerals are concentrated in an area with a small projection, the low-transmission signals in other areas will drag down the overall judgment of the ore grade. Another example is that when high-density minerals are dispersed in an area with a large thickness, the low-penetration signals of the large thickness will raise the overall judgment of the ore grade. Underestimating the grade of the ore will cause losses of ore resources, and overestimating the grade of the ore will increase energy consumption and tailings discharge.

[0006] 2. Existing ore identification methods all distinguish between concentrate and waste rock based on whether the target mineral is displayed in the transmission image and the size of the target mineral display area. This identification method ignores the proportion of the target mineral in the ore particles, and may identify large-volume low-grade ores as concentrate and small-volume medium- and high-grade ores as waste rock.

[0007] 3. Ore particles are randomly scattered on the conveyor belt, and it is difficult for the image recognition and positioning tracking system and the air exhaust gun blowing system to accurately sort the waste rock.

[0008] 4. Ore particles sometimes stack up on the conveyor belt, and identification and sorting errors may occur.

[0009] Search literature:

[0010] Chinese Patent: CN 108067439 A

[0011] Chinese Patent: CN 118926129 A

[0012] Chinese Patent: CN 118142876 A

[0013] Chinese Patent: CN 118287399 A

[0014] Experimental study of XRT intelligent sorting machine in Fankou lead-zinc mine "Mining Research and Development" 2019 Issue 12

[0015] Research and practice on the application of XRT intelligent pre-selection and discarding technology in China Metal Mining 2024 Issue 8 Summary of the invention

[0016] In order to overcome the shortcomings of the background technology, the present invention discloses an ore sorting device and an ore identification method based on dual-energy XRT transmission technology, the purpose of which is:

[0017] 1. Irradiate the ore particles at multiple angles to accurately obtain the distribution of minerals within the ore particles;

[0018] 2. The volume ratio of the target mineral to the ore is used as the basis for determination to improve the recognition accuracy of ore particles;

[0019] 2. Simplify the structure, improve the accuracy of picking, and avoid the stacking of ore particles.

[0020] The present invention adopts the following technical solution:

[0021] Technical solution 1:

[0022] An ore sorting device based on dual-energy XRT transmission technology, comprising:

[0023] A material box containing ore particles;

[0024] Multi-row rubber chutes, and ore particles can roll downward along the rubber chutes;

[0025] A feeding roller, horizontally arranged in the feed bin, is used to individually place the ore particles in the feed bin at the top of the slope of the multi-row rubber chutes;

[0026] At least three imaging units composed of an X-ray source and a detector, adopting dual-energy XRT transmission technology, are used to obtain the transmission images of ore particles when they roll downward in the multi-row rubber chutes;

[0027] A waste rock identification system is used to identify waste rocks and mark the rubber chutes where the waste rocks are located;

[0028] A rejection system includes sensors and rejection mechanisms correspondingly arranged at the bottom of the slope of the rubber chutes. When the rejection system knows that there is a waste rock in a certain rubber chute and the sensor senses that the waste rock enters the bottom of the slope, the rejection mechanism acts to change the throwing trajectory of the waste rock.

[0029] After implementing Technical Solution 1, the beneficial effects of the present invention are:

[0030] 1. The rubber chutes have a large enough frictional force to make the ore particles roll rather than slide. Secondly, as the carrier of the ore particles, the rubber chutes have uniform low transmission characteristics, which can eliminate the interference of the carrier on the transmission images. Moreover, the rubber chutes have retaining edges. First, the retaining edges can restrict the rolling route of the ore particles, so that the ore particles can only roll in a certain rubber chute; second, the retaining edges can show parallel dark stripes on the transmission images, which helps the waste rock identification system and the rejection system to locate in which rubber chute the waste rock appears.

[0031] 2. In the prior art, when the X-ray source irradiates the ore particles, the ore particles either move translationally along the conveyor belt or are in a throwing state. In the present invention, the ore particles are made to roll through the rubber chutes, and multiple transmission images of the ore particles at different rolling angles can be obtained without affecting the production efficiency, and then the distribution of minerals in the ore particles can be accurately obtained through image analysis.

[0032] 3. Compared with the XRF transmission technology, the dual-energy XRT transmission technology can generate high-energy rays and low-energy rays. Under the irradiation of the dual-energy rays, substances with the same atomic number have different absorption degrees for the low-energy rays and the high-energy rays, so that the target minerals can be distinguished from other substances by comparison, and a target mineral distribution area with obvious gray-scale difference is formed.

[0033] 4. Compared with the prior art, the present invention does not require an industrial camera and a complex positioning and tracking system, and only through the rubber chutes and sensors, the reliability and accuracy of sorting can be improved.

[0034] 5. The feeding roller can ensure that only one ore particle enters the rubber chute each time, solving the problem of easy stacking of ore particles.

[0035] Improved technical solution 2 based on technical solution 1: On the bottom surface of the multi-row rubber chute, there are transverse bars for obstructing ore particles and making the ore particles roll. The transverse bars are arranged between two adjacent imaging units.

[0036] After implementing technical solution 2, the beneficial effects are as follows: In special cases, ore particles may slide in the rubber chute. The setting of the transverse bars can force the ore particles to roll.

[0037] Improved technical solution 3 based on technical solution 1: On the cylindrical surface of the feeding roller, there are multiple rows of ore-receiving cavities arranged circumferentially and only capable of accommodating one ore particle. When the feeding roller rotates, the ore particles in the feed box are successively placed at the top of the multi-row rubber chute through the ore-receiving cavities.

[0038] After implementing technical solution 3, the beneficial effects are as follows: The setting of the ore-receiving cavities can ensure that only one ore particle enters the rubber chute when the feeding roller rotates.

[0039] Improved technical solution 4 based on technical solution 3: In the feed box, there is a horizontally rotatable material-deflecting plate for deflecting ore particles towards the feeding roller side so that the ore particles enter the ore-receiving cavities.

[0040] After implementing technical solution 4, the beneficial effects are as follows: The setting of the material-deflecting plate in the feed box helps the ore particles enter the ore-receiving cavities without leaving empty spaces.

[0041] An ore identification method applied to technical solutions 1-4. By analyzing the transmission images of ore particles at different rolling angles, the volume ratio of the target mineral or its associated mineral to the volume of the ore particle is obtained. If the volume ratio is greater than the sorting threshold, the ore particle is determined to be a concentrate ore; if the volume ratio is greater than the sorting threshold, the ore particle is determined to be waste rock.

[0042] After implementing the above ore identification method, the beneficial effects of the present invention are as follows:

[0043] This ore identification method does not distinguish concentrate ore and waste rock by relying on the size of the display area of the target mineral, nor by relying on the area ratio of the display area of the target mineral to the ore contour. Instead, it uses the volume ratio of the target mineral or its associated mineral to the volume of the ore particle as the sorting standard. This ore identification method with the volume ratio as the sorting threshold can truly reflect the ore content of the ore and will not cause misestimation of the ore grade.

[0044] For precious metal ores such as gold ores, the ore content itself is very small. If gold ores are used as the target minerals, it is very difficult to show them in the transmission images. The associated minerals of gold include silver, copper, lead, zinc, pyrite, galena, sphalerite, chalcopyrite, etc. These associated minerals have high contents and are closely related to the formation of gold ores, and can be used as the identification basis of ores instead of gold elements.

[0045] Embodiment 1 of the above ore identification method: Obtain the projected contours of ore particles and the projected shapes of target minerals in each transmission image, reconstruct the three-dimensional structures of ore particles and target minerals through the filtered back-projection algorithm or the iterative reconstruction algorithm, and then calculate the volumes and volume ratios of target minerals and ore particles respectively.

[0046] The advantage of Embodiment 1 is that it can intuitively display the three-dimensional structure of target minerals, and the disadvantages are large computational amount, slow system response time, and easy appearance of artifacts.

[0047] Embodiment 2 of the above ore identification method: Select three transmission images, and obtain the projected area of the ore particle contour and the projected area of the target mineral distribution area by counting the number of pixels in the area. And the projected area of the target mineral distribution area Then according to the formula Estimate the volume of the target mineral distribution area And the ratio to the volume V of the ore particles.

[0048] Embodiment 2 is applicable to the situation where the shapes of ore particles and target minerals are both close to cubes or cuboids. Its advantages are small computational amount and the volume ratio can be calculated in a very short time, and its disadvantage is large error.

[0049] Embodiment 3 of the above ore identification method: Select one transmission image, divide the projected contour of the ore particle into the gangue distribution area and the target mineral distribution area, and obtain the projected area S of the ore particle contour and the projected area of the target mineral distribution area by counting the number of pixels in the area. ; Obtain the average thickness H of the ore particle based on the average gray level in the gangue distribution area, and obtain the average thickness of the target mineral distribution area based on the average gray level in the target mineral distribution area. Then according to the formula Calculate the volume of the target mineral distribution area And the volume ratio to the volume V of the ore particle. Select multiple transmission images, calculate the volume ratio of the target mineral distribution area to the ore particle volume, and then use the average volume ratio of each volume ratio as the volume ratio of the target mineral to the ore particle.

[0050] The advantages of Embodiment 3 are wide applicability, small computational amount, fast system response time, and small error. It is an ideal and practical method. Brief Description of the Drawings

[0051] The attached Figure 1 shows a schematic diagram of the overall structure of the ore sorting equipment.

[0052] The attached Figure 2 shows a schematic diagram of the structure of the feed bin and the rubber chute.

[0053] The attached Figure 3 shows a schematic diagram of the structure of the feeding roller.

[0054] The attached Figure 4 shows a schematic diagram of the structure of the imaging unit.

[0055] The attached Figure 5 shows a schematic diagram of the structure of the rejection system.

[0056] The attached Figure 6 shows a schematic diagram of the working principle of the ore sorting equipment.

[0057] The attached Figure 7 shows a schematic diagram of the target mineral and ore particles in Embodiment 2.

[0058] The attached Figure 8 shows a schematic diagram of the target mineral and ore particles in Embodiment 3.

[0059] In the drawings: 1, feed bin; 1.1, material pushing plate; 2, rubber chute; 2.1, edge stop; 2.2, transverse strip; 3, feeding roller; 3.1, stone receiving cavity; 4, imaging unit; 4.1, X-ray source; 4.2, detector; 4.3, fixing bracket; 5, rejection system; 5.1, sensor; 5.2, baffle; 5.3, cylinder; 5.4, suspension. Detailed Description of the Invention

[0060] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these preferred embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention. It should be noted that in the description of the present invention, the terms "front", "rear", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for convenience of description and does not indicate or imply that the device or component must have a specific orientation and positional relationship. Therefore, it should not be construed as a limitation of the present invention. It should also be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0061] An ore sorting device based on dual-energy XRT transmission technology relates to the field of ore dressing and is mainly used to solve the problem of inaccurate discrimination of ore grades in the prior art. The composition structure and working principle of this ore sorting device will be specifically described below.

[0062] Refer to the attached Figure 1 This ore sorting device mainly consists of a feed box 1, a rubber chute 2, a feeding roller 3, an imaging unit 4, a waste rock identification system, and a blocking and sorting system 5.

[0063] Refer to the attached Figure 2 , the attached Figure 2 shows a schematic structural diagram of the feed box and the rubber chute. As can be seen from the attached Figure 2 , the feed box 1 has an inclined opening, and multiple rows of rubber chutes 2 with retaining edges 2.1 are lapped at the inclined opening of the feed box 1. Since the rubber chute 2 has a certain inclination angle and has sufficient friction, the ore particles can roll down along the rubber chute 2 instead of sliding.

[0064] In order to ensure that the ore particles roll on the rubber chute 2, transverse ribs 2.2 with a relatively small protruding height are provided on the bottom surface of the rubber chute 2. The transverse ribs 2.2 can block the ore particles and force the ore particles to change from a sliding state to a rolling state.

[0065] As a carrier of ore particles, the rubber chute 2 has a uniform low transmission characteristic, which can eliminate the interference of the carrier on the transmission image. The retaining edge 2.1 of the rubber chute 2 can restrict the rolling path of the ore particles, so that the ore particles can only roll in a certain rubber chute 2. In addition, the retaining edge 2.1 can show parallel dark stripes on the transmission image, which helps the waste rock identification system and the barrier selection system 5 to locate in which rubber chute 2 the waste rock appears.

[0066] See attached Figure 1 and attached Figure 3 , attached Figure 3 The figure shows a schematic diagram of the structure of the feeding roller. The feeding roller 3 is horizontally arranged in the material box 1, and is used to place the ore particles in the material box 1 one by one on the top of the slope of the multiple rows of rubber chutes 2. Specifically, multiple rows of stone containing cavities 3.1 that can only accommodate one ore particle are arranged in a circumferential array on the cylinder surface of the feeding roller 3. When the feeding roller 3 rotates, the ore particles in the material box 1 can be placed one by one on the top of the slope of the multiple rows of rubber chutes 2 through the stone containing cavities 3.1, so as to avoid multiple ore particles from entering the same rubber chute 2 at the same time. In addition, a horizontally rotatable material shifting plate 1.1 is arranged in the material box 1, and the material shifting plate 1.1 is used to shift the ore particles to one side of the feeding roller 3 to ensure that all ore particles can enter the stone containing cavity 3.1 without leaving any empty space.

[0067] Most of the ore particles after crushing and classification are in block or spherical shape, and a small part is in flake, strip or other shapes. The stone holding chamber 3.1 has a square entrance, which is suitable for block or spherical ore particles to enter the stone holding chamber 3.1. This design is equivalent to a screening of the ore particles, ensuring that each ore particle has a small shape and volume difference.

[0068] See attached Figure 4 , attached Figure 4 The structure of the imaging unit is shown in FIG. Figure 4 It can be seen that three groups of imaging units 4 are installed at equal intervals on the rubber chute 2, and a plurality of horizontal trip bars 2.2 are arranged between the three groups of imaging units 4. The imaging unit 4 is composed of an X-ray source 4.1 arranged just above the rubber chute 2 and a detector 4.2 arranged just below the rubber chute 2, and a fixing frame 4.3 is arranged between the X-ray source 4.1 and the detector 4.2. The imaging unit 4 can obtain the transmission image of the ore particles rolling down in the multiple rows of rubber chute 2 by emitting and receiving X-rays. Since the imaging unit 4 adopts dual-energy XRT transmission technology, it can distinguish the target minerals in the transmission image from other substances and form a clear target mineral distribution area. It is worth noting that more imaging units 4 can be arranged, so that more transmission images can be obtained, and more transmission images help to improve the recognition accuracy of ore particles.

[0069] The transmitted image obtained by the imaging unit 4 is transmitted to the waste rock identification system, which is used to identify waste rocks and mark the rubber chutes where the waste rocks are located.

[0070] Refer to the appendix Figure 5 , the appendix Figure 5 shows the structural schematic diagram of the rejection system. As can be seen from the appendix Figure 5 , the rejection system 5 mainly consists of sensors 5.1 arranged in an array at the bottom of the slope of the rubber chute 2 and a rejection mechanism. The number of sensors 5.1 and the rejection mechanism corresponds to the number of rubber chutes 2.

[0071] In this embodiment, the rejection mechanism is composed of a baffle 5.2 and a cylinder 5.3. Among them, the baffle 5.2 is hinged on the suspension 5.4, and the cylinder 5.3 is hinged between the suspension 5.4 and the baffle 5.2. When the cylinder 5.3 is in the extended state, the baffle 5.2 is lifted; when the cylinder 5.3 is in the retracted state, the baffle 5.2 is pressed down.

[0072] Working principle:

[0073] Refer to the appendix Figure 6 . During operation, the feeding plate 1.1 rotates clockwise to push the ore particles towards the side of the feeding roller 3. At the same time, the feeding roller 3 rotates counterclockwise to drop the ore particles in the material box 1 one by one onto the top of the slope of the multi-row rubber chutes 2. After the ore particles enter the rubber chutes 2, they roll down. During the rolling process of the ore particles, the waste rock identification system can obtain three transmitted images of the ore particles at different rolling angles through the imaging unit 4, and then identify the waste rocks by analyzing the transmitted images and mark the rubber chutes 2 where the waste rocks are located.

[0074] When the rejection system 5 knows that there is a waste rock in a certain rubber chute 2 and the sensor 5.1 corresponding to this rubber chute 2 senses that the waste rock enters the bottom of the slope, the cylinder 5.3 corresponding to this rubber chute 2 immediately retracts, driving the baffle 5.2 to press down, thereby changing the throwing trajectory of the waste rock by blocking and making the waste rock fall into the waste box 1.

[0075] In order to more deeply reveal the working principle of this ore sorting equipment, the present invention also provides an ore identification method. The core idea is to calculate the ratio of the volume of the target mineral or its associated mineral to the volume of the ore particle by analyzing the transmitted images of the ore particle at different rolling angles. If the volume ratio is greater than the sorting threshold, it is determined that the ore particle is a concentrate ore; if the volume ratio is greater than the sorting threshold, it is determined that the ore particle is a waste rock.

[0076] Detecting the volume ratio of the target ore body to the ore particles is an important basis for detecting the ore content in the laboratory and can truly reflect the grade of the ore. However, the difficulty of this identification method lies in that it is difficult to obtain the volume of each ore particle and the target mineral within it in a very short time by using conventional detection means on the basis of ensuring that the ore sorting equipment sorts 40 - 120 tons of ore per hour. Therefore, the present invention provides three methods for calculating the volume ratio.

[0077] Embodiment 1: Obtain the projection contours of the ore particles and the projection shapes of the target minerals in each transmission image, reconstruct the three-dimensional structures of the ore particles and the target minerals through the filtered back-projection algorithm or the iterative reconstruction algorithm, and then calculate the volumes and volume ratios of the target minerals and the ore particles respectively.

[0078] The filtered back-projection algorithm and the iterative reconstruction algorithm are image reconstruction methods widely used in the field of medical CT. By analyzing multiple transmission images, two-dimensional images can be reconstructed into three-dimensional images to reproduce the three-dimensional structures of the target minerals and the ore particles. The advantage of this method is that it can intuitively display the three-dimensional structures of the target minerals and the ore particles, facilitating the calculation of the volumes of the target minerals and the ore particles by counting the number of voxels; the disadvantages are that a large number of transmission images need to be provided, and feature points need to be selected as reference coordinates, resulting in problems such as large computational amount, slow system response time, and easy appearance of artifacts.

[0079] Embodiment 2: Refer to Appendix Figure 7 , select three transmission images, and obtain the projected area of the ore particle contour by counting the number of pixels in the area where it is located , as well as the projected area of the target mineral distribution area Then, according to the formula estimate the volume of the target mineral distribution area and the ratio to the volume V of the ore particles.

[0080] This method for calculating the volume ratio is applicable to the case where the shapes of the ore particles and the target minerals are both close to cubes or cuboids. Its advantages are small computational amount and the ability to calculate the volume ratio in a very short time; its disadvantage is that the obtained transmission images cannot ensure that the cuboids are all in the front view state, and the estimated volume is larger than the actual volume. However, since the volumes of both the ore particles and the target minerals are overestimated equally, this method for calculating the volume ratio still has the value of discriminating the ore grade.

[0081] Embodiment 3: Refer to Appendix Figure 8 , select one transmission image. After knowing the projection contour of the ore particle and the distribution area of the target mineral, divide the projection contour of the ore particle into the gangue distribution area and the target mineral distribution area, and obtain the projected area S of the ore particle contour and the projected area of the target mineral distribution area by counting the number of pixels in the area where it is located The average thickness H of the ore particles is obtained based on the average gray level within the gangue distribution area, and the average thickness of the target mineral distribution area is obtained based on the average gray level within the target mineral distribution area. , and then according to the formula calculate the ratio of the volume of the target mineral distribution area to the volume V of the ore particles.

[0082] The characteristic of this volume ratio calculation method is that the target mineral and the ore particles are regarded as cylinders with irregular contours, and the target mineral, gangue and their areas can be distinguished according to the gray level of the transmission image. Since the gray level of the transmission image is also related to the original intensity of the X-ray, the receiving intensity I of the detector, the thickness h of the transmitted substance, and the ray attenuation coefficient u of different substances, the average thickness of the target mineral can be calculated respectively through the X-ray transmission formula and the average thickness H of the gangue, and then calculate the ratio of the volume of the target mineral distribution area to the volume V of the ore particles. Since the ray attenuation coefficient of the target mineral is large and the X-ray intensity received by the detector is small, the average thickness of the target mineral is less than the average thickness H of the ore particles, which also indirectly proves that the target mineral is embedded or wrapped in the gangue. The advantages of this volume ratio calculation method are that it is applicable to most ore particles, has a small calculation amount, a fast system response time, and small errors, and is an ideal and practical method.

[0083] Furthermore, since a volume ratio can be calculated for each transmission image, multiple transmission images can be selected and the ratio of the volume of the target mineral distribution area to the volume of the ore particles can be calculated, and then these volume ratios are averaged, and the average volume ratio is used as the volume ratio of the target mineral to the ore particles in the ore particle. Obviously, this average algorithm can exclude the influence of deviation and is closer to the true volume ratio.

[0084] It should be noted that the content not described in detail in the above embodiments is the prior art. It should also be noted that for those skilled in the art, any increase, decrease, replacement and improvement made under the structure and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An ore sorting device based on dual-energy XRT transmission technology, characterized in that: include: A material box containing ore particles; Multiple rows of rubber chutes, along which the ore particles can roll down; The feeding roller is horizontally arranged in the material box and is used to put the ore particles in the material box one by one onto the top of the slope of the multiple rows of rubber chutes; At least three imaging units consisting of X-ray sources and detectors, using dual-energy XRT transmission technology to obtain transmission images of ore particles rolling down in multiple rows of rubber chutes; A waste rock identification system to identify waste rock and mark the rubber chutes where the waste rock is located; The blocking system includes a sensor and a blocking mechanism correspondingly arranged at the bottom of the rubber chute. When the blocking system learns that there is waste rock in a rubber chute and the sensor senses that the waste rock enters the bottom of the slope, the blocking mechanism is activated to change the throwing trajectory of the waste rock.

2. The ore sorting equipment based on dual-energy XRT transmission technology according to claim 1, characterized in that: A horizontal trip bar used to block the ore particles and make the ore particles roll is arranged on the bottom surface of the multiple rows of rubber slides, and the horizontal trip bar is arranged between two adjacent imaging units.

3. The ore sorting equipment based on dual-energy XRT transmission technology as claimed in claim 1, characterized in that: A plurality of rows of stone containing cavities which can only contain one ore particle are arranged in a circumferential array on the cylinder surface of the feeding drum. When the feeding drum rotates, the ore particles in the material box are placed one by one on the top of the slope of the plurality of rows of rubber chutes through the stone containing cavities.

4. The ore sorting equipment based on dual-energy XRT transmission technology as claimed in claim 3, characterized in that: A horizontally rotatable material shifting plate is arranged in the material box, and the material shifting plate is used to shift the ore particles to one side of the upper material drum so that the ore particles enter the stone containing cavity.

5. An ore identification method applied to an ore sorting device according to any one of claims 1 to 4, characterized in that: By analyzing the transmission images of ore particles at different rolling angles, the volume ratio of the target mineral or its associated minerals to the ore particles is calculated. If the volume ratio is greater than the sorting threshold, the ore particle is determined to be concentrate; if the volume ratio is greater than the sorting threshold, the ore particle is determined to be waste rock.

6. A method for identifying an ore according to claim 5, characterized in that: The projection outline of the ore particles and the projection shape of the target mineral in each transmission image are obtained, and the three-dimensional structure of the ore particles and the target mineral is reconstructed by a filtered back-projection algorithm or an iterative reconstruction algorithm. Then, the volume and volume ratio of the target mineral and the ore particles are calculated respectively.

7. A method for identifying minerals according to claim 5, characterized in that: Select a transmission image, divide the projection outline of the ore particles into the gangue distribution area and the target mineral distribution area, and obtain the projection area S of the ore particle outline and the projection area of ​​the target mineral distribution area by counting the number of pixels in the area. ; The average thickness H of the ore particles is calculated based on the average grayscale in the gangue distribution area, and the average thickness H of the target mineral distribution area is calculated based on the average grayscale in the target mineral distribution area. , then according to Calculate the volume of the target mineral distribution area The volume of ore particles volume ratio.

8. A method for identifying minerals according to claim 7, characterized in that: Select multiple transmission images and calculate the volume ratio of the target mineral distribution area to the ore particle volume, and then take the average volume ratio of each volume ratio as the volume ratio of the target mineral volume to the ore particle.

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