Moving mine car uranium ore grade detection method capable of stripping thorium and potassium radiation interference

Abstract

The invention relates to a moving mine car uranium ore grade detection method capable of stripping thorium and potassium radiation interference, which comprises the following steps: when a mine car passes through a moving mine car uranium ore grade detection device, acquiring gamma-ray spectrum data through gamma detectors arranged right above the center of the mine car and at boundary positions on two sides of the mine car respectively; dividing each piece of gamma-ray energy spectrum data into four energy regions; four energy spectrum traffic curves are constructed according to the energy spectrum counting rates of the four energy regions of each collection point, and the effective counting rate of the uranium element is obtained through the energy spectrum traffic curves, so that the uranium ore grade is obtained. The method can peel off thorium / potassium radiation interference and has the advantages of being high in detection efficiency, capable of effectively peeling off thorium / potassium radiation interference and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear technology application, and in particular relates to a method for detecting the grade of uranium ore in a moving mine car capable of stripping thorium potassium radiation interference. Background Art

[0002] The uranium ore grade detection equipment for mine cars plays a vital role in the industrial chain of uranium ore mining and transportation. The uranium ore grade detection equipment for mine cars uses advanced detection technology to accurately measure the ore in the mine car and accurately judge the grade of the ore by analyzing the natural characteristics of the ore. Through real-time monitoring and data analysis of the uranium ore grade detection equipment for mine cars, enterprises can timely understand the grade changes of the ore, thereby optimizing mining plans and production processes, and ensuring the effective use of resources and the sustainability of production.

[0003] At present, most of the mine car uranium ore grade detection equipment commonly used at home and abroad is based on a fixed measurement method. The core of this method is to require the measured mine car to be accurately parked at a specific position of the scanning station to ensure that the grade of the ore on the mine car is accurately obtained through the high-precision radioactive scanning station. However, this measurement method faces a series of challenges in actual operation. First, due to various reasons such as driver operation, differences in mine car size and environmental factors, it is difficult for the mine car to be accurately parked at the designated position every time, which often leads to an increase in measurement errors and affects the accuracy of the data. Second, the mine car needs to stop completely during the scanning process, which not only affects the continuity of transportation, but also makes the entire measurement process lengthy, usually taking 5 to 10 minutes, greatly reducing the operating efficiency. Third, the current gamma total uranium grade quantitative technology will be interfered by thorium potassium radiation, resulting in a large deviation in the grade calculation results.

[0004] In summary, although the fixed measurement method has a wide application base in the field of ore grade detection, it faces disadvantages such as low operating efficiency, large measurement error, and susceptibility to thorium / potassium radiation interference in actual operation. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for detecting the grade of uranium ore in a moving mine car that can strip away the interference of thorium and potassium radiation. The method can effectively strip away the interference of thorium / potassium radiation and realize real-time detection of the grade of the mine car during driving. The method avoids the inconvenience of parking and starting the mine car, reduces the errors caused by inaccurate parking positions, and significantly improves the detection efficiency and accuracy. The method provides timely and accurate grade information for mining production, which is of great significance to improving mining production efficiency and resource utilization.

[0006] The purpose of the present invention is to achieve the following technical solution: a method for detecting the grade of uranium ore in a moving mine car capable of stripping the radiation interference of potassium thorium, the process is as follows:

[0007] When the mine car passes through the moving mine car uranium ore grade detection device, gamma energy spectrum data are collected respectively by setting gamma detectors just above the center of the mine car and at the boundaries of both sides;

[0008] Each gamma-ray energy spectrum data is divided into four energy regions: the first energy region is the thorium characteristic energy region, covering the maximum characteristic peak of thorium at 2.615MeV; the second energy region is the uranium, thorium and potassium high energy region, covering the two characteristic peaks of uranium at 2.20MeV and 1.765MeV; the third energy region is the uranium characteristic energy region, covering the maximum characteristic peak of uranium at 1.765MeV; the fourth energy region is the potassium characteristic energy region, covering the only characteristic peak of potassium at 1.461MeV.

[0009] The four energy spectrum traffic curves constructed by the energy spectrum count rate of the four energy zones of each acquisition point are recorded as: {N iX (t j )},t j is the time of the jth collection point, N iX (t j ) represents the energy spectrum counting rate obtained at the jth acquisition point in the i-th energy region of the detector X;

[0010] Calculate the effective counting rate N of potassium element using formula (1) KX (t j ), if N KX (t j ) is less than zero, then let N KX (t j )=0;

[0011] N KX (t j )=N 4X (t j )-K 14X N 1X (t j )-K 34X N 3X (t j ) (1);

[0012] Where N 4X (t j ) is the energy spectrum count rate obtained at the jth acquisition point in the 4th energy zone of detector X, N 1X (t j ) is the energy spectrum count rate obtained at the jth acquisition point in the first energy zone of detector X, N 3X (t j ) is the energy spectrum count rate obtained at the jth acquisition point in the third energy zone of detector X, K 14X It represents the ratio of the energy spectrum counting rate generated by the thorium element in the detector X in the 4th energy zone to the energy spectrum counting rate generated in the 1st energy zone; K34X It represents the ratio of the energy spectrum counting rate generated by uranium element in detector X in the 4th energy zone to the energy spectrum counting rate generated in the 3rd energy zone;

[0013] Calculate the effective counting rate N of uranium element using formula (2) UX (t j ):

[0014] N UX (t j )=N 2X (t j )-K 12X N 1X (t j )-K K2X N KX (t j ) (2);

[0015] Where N 2X (t j ) is the energy spectrum count rate obtained at the jth acquisition point in the second energy region of detector X, K 12X It represents the ratio of the energy spectrum counting rate generated by thorium in the second energy zone to the energy spectrum counting rate generated in the first energy zone; K K2X It represents the ratio of the effective counting rate of potassium element to the energy spectrum counting rate generated by potassium element in the third energy region;

[0016] Calculate the uranium ore grade Q using formula (3) U :

[0017]

[0018] In the formula, K UQ It is the conversion coefficient, which represents the total effective counting rate of uranium element measured by the uranium ore grade detection device of the moving mine car when the mine car is fully loaded with uranium ore of unit content.

[0019] Specifically, the energy range of the first energy region is [2.4MeV, 2.8MeV];

[0020] The energy range of the second energy region is [0.4MeV, 2.3MeV];

[0021] The energy range of the third energy region is [1.6MeV, 1.9MeV];

[0022] The energy range of the 4th energy region is [1.3MeV, 1.55MeV].

[0023] Further preferably, the uranium ore grade detection device for a moving mine car includes a mounting bracket arranged on the mine car's travel route, a main gamma detector is arranged directly above the central axis of the mine car's position area, a first auxiliary gamma detector is arranged directly above the left boundary of the mine car's position area, and a second auxiliary gamma detector is arranged directly above the right boundary of the mine car's position area, and the first auxiliary gamma detector, the second auxiliary gamma detector and the main gamma detector are on the same plane.

[0024] Further preferably, the distance between the main gamma detector and the top of the ore is greater than 1 m.

[0025] Further preferably, a first infrared counter-radiation sensor transmitting end and a second infrared counter-radiation sensor transmitting end are arranged on one side of the mine car position area, and a first infrared counter-radiation sensor receiving end and a second infrared counter-radiation sensor receiving end are arranged on the other side of the mine car position area.

[0026] The beneficial effects of the present invention are: it realizes the measurement of the uranium grade of the ore while the mine car is traveling, automatically deducts the influence of thorium and potassium radiation on the measurement results, has the advantages of improving detection efficiency and reducing production costs, and can realize automatic processing through computer programming. The present invention provides timely and accurate grade information for mining production, which is of great significance to improving mining production efficiency and resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 This is a schematic diagram of a uranium ore grade detection device for a moving mine car;

[0029] Figure 2 is a flow chart of the method of the present invention;

[0030] Figure 3 It is a schematic diagram of the gamma energy spectrum curve, energy peak and energy range division scheme; Figure 4 The first energy zone traffic curve of Example 1;

[0031] Figure 5 The second energy zone traffic curve of Example 1;

[0032] Figure 6 The third energy zone traffic curve of Example 1;

[0033] Figure 7 It is the traffic curve of the 4th energy zone in Example 1;

[0034] Figure 8 is the traffic curve of the effective counting rate of the uranium element in Example 1; DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] Example 1

[0038] like Figure 1 As shown, a moving mine car uranium ore grade detection device includes a mounting bracket arranged on the mine car travel route, a first infrared counter-radiation sensor transmitting end 1 and a second infrared counter-radiation sensor transmitting end 3 are arranged on one side of the mine car position area through the mounting bracket, a first infrared counter-radiation sensor receiving end 2 and a second infrared counter-radiation sensor receiving end 4 are arranged on the other side of the mine car position area, a main gamma detector 5 is arranged just above the central axis of the mine car position area, the main gamma detector 5 is more than 1m away from the top of the ore, a first auxiliary gamma detector 6 is arranged just above the left boundary of the mine car position area, a second auxiliary gamma detector 7 is arranged just above the right boundary of the mine car position area, and the first auxiliary gamma detector 6, the second auxiliary gamma detector 7 and the main gamma detector 5 are on the same plane. The gamma detector can obtain gamma energy spectrum data, the energy resolution is better than 8%@662keV, the total number of channels is greater than 1024, and the detection range covers 0~3MeV.

[0039] Reference Figure 2 , a method for detecting the grade of uranium ore in a moving mine car capable of stripping away the radiation interference of thorium potassium, comprising:

[0040] Gamma spectrum data collection: When the mine car passes through the moving mine car uranium ore grade detection device and blocks the infrared counter-radiation sensor, the three gamma detectors are activated to periodically collect gamma spectrum data at intervals of 1 second. During the gamma spectrum data collection process, the three independent gamma detectors are responsible for recording and saving gamma spectrum data; once the mine car leaves and removes the blockage of the infrared counter-radiation sensor, the collection of gamma spectrum data will stop immediately;

[0041] Gamma Spectroscopy Data Processing:

[0042] S1. Divide each gamma spectrum data into 4 energy regions (such as Figure 3shown):

[0043] The first energy zone has an energy range of [2.4MeV, 2.8MeV]. This energy zone reflects the characteristic peaks of the high-energy zone of thorium, mainly covering the maximum characteristic peak of thorium at 2.615MeV.

[0044] The second energy region, with an energy range of [0.4MeV, 2.3MeV], reflects some characteristic peaks of uranium, thorium and potassium in the high energy region, as well as other energy peaks and the counting effect of Compton Plateau. This energy region covers the two characteristic peaks of uranium, 2.20MeV and 1.765MeV;

[0045] The third energy region, with an energy range of [1.6MeV, 1.9MeV], reflects some characteristic peaks of the uranium high energy region, mainly covering the maximum characteristic peak of uranium at 1.765MeV;

[0046] The fourth energy region, with an energy range of [1.3MeV, 1.55MeV], mainly covers the only characteristic peak of potassium at 1.461MeV.

[0047] S2, the four energy spectrum traffic curves constructed by the energy spectrum count rate of the four energy zones of each collection point are recorded as: {N iX (t j )}, where i = 1,…, 4; j = 1, 2,…, n; X = 1, 2, 3; i is the sequence number of the four energy zones; j is the sequence number of the acquisition point, n is the number of acquisition points; X is the detector number; t j is the time of the jth collection point, N iX (t j ) represents the energy spectrum count rate obtained by the i-th energy region of the detector X at the j-th acquisition point. The four energy spectrum traffic curves obtained in this embodiment are as follows: Figures 4 to 7 As shown;

[0048] S3. Calculate the effective counting rate N of potassium element using formula (1) KX (t j ), if N KX (t j ) is less than zero, then let N KX (t j )=0;

[0049] N KX (t j )=N 4X (t j )-K 14X N 1X (t j )-K 34X N 3X (t j ) (1);

[0050] Where N4X (t j ) is the energy spectrum count rate obtained at the jth acquisition point in the 4th energy zone of detector X, N 1X (t j ) is the energy spectrum count rate obtained at the jth acquisition point in the first energy zone of detector X, N 3X (t j ) is the energy spectrum count rate obtained at the jth acquisition point in the third energy zone of detector X, K 14X It represents the ratio of the energy spectrum counting rate generated by the thorium element in the detector X in the 4th energy zone to the energy spectrum counting rate generated in the 1st energy zone; K 34X It represents the ratio of the energy spectrum counting rate generated by uranium element in detector X in the 4th energy zone to the energy spectrum counting rate generated in the 3rd energy zone;

[0051] Since N obtained in this embodiment KX (t j ) are all less than zero, then let N KX (t j )=0.

[0052] S4. Calculate the effective counting rate N of uranium element using formula (2) UX (t j ):

[0053] N UX (t j )=N 2X (t j )-K 12X N 1X (t j )-K K2X N KX (t j ) (2);

[0054] Where N 2X (t j ) is the energy spectrum count rate obtained at the jth acquisition point in the second energy region of detector X, K 12X It represents the ratio of the energy spectrum counting rate generated by thorium in the second energy zone to the energy spectrum counting rate generated in the first energy zone; K K2X represents the ratio of the effective counting rate of potassium element to the energy spectrum counting rate generated by potassium element in the third energy zone; the effective counting rate N of uranium element obtained in this embodiment UX (t j )like Figure 8 As shown;

[0055] S5. Calculate the uranium ore grade Q using formula (3) U :

[0056]

[0057] In the formula, KUQ is the conversion coefficient, which indicates the total effective counting rate of uranium element measured by the uranium ore grade detection device of the moving mine car when the mine car is fully loaded with uranium ore of unit content. U =172.01g / .

[0058] In the present invention, K 14X , K 34X , K 12X , K K2X , K UQ It is affected by factors such as detector performance, detector installation height, and the shape of the mine car bucket. However, for the uranium ore grade detection device for moving mine cars measuring fixed vehicles, the above parameters are fixed, so the parameters can be obtained by comparing the instrument scale.

[0059] The embodiments described above are only descriptions of the preferred methods of the present application, and are not intended to limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements made to the technical solutions of the present application by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present application.

Claims

1. A method for detecting the grade of uranium ore in a moving mine car capable of stripping away the radiation interference of potassium thorium, characterized in that: When the mine car passes through the moving mine car uranium ore grade detection device, gamma energy spectrum data are collected respectively by setting gamma detectors just above the center of the mine car and at the boundaries of both sides; Each gamma-ray spectrum data is divided into four energy regions: the first energy region is the thorium characteristic energy region, covering the maximum characteristic peak of thorium at 2.615 MeV; the second energy region is the uranium, thorium and potassium high energy region, covering the characteristic peaks of uranium at 2.20 MeV and 1.765 MeV; the third energy region is the uranium characteristic energy region, covering the maximum characteristic peak of uranium at 1.765 MeV; the fourth energy region is the potassium characteristic energy region, covering the only characteristic peak of potassium at 1.461 MeV; The four energy spectrum traffic curves constructed by the energy spectrum count rate of the four energy zones of each acquisition point are recorded as: {N iX (t j )},t j is the time of the jth collection point, N iX (t j ) represents the energy spectrum counting rate obtained at the jth acquisition point in the i-th energy region of the detector X; Calculate the effective counting rate N of potassium element using formula (1) KX (t j ), if N KX (t j ) is less than zero, then let N KX (t j )=0; N KX (t j )=N 4X (t j )-K 14X N 1X (t j )-K 34X N 3X (t j ) (1); Where N 4X (t j ) is the energy spectrum count rate obtained at the jth acquisition point in the 4th energy zone of detector X, N 1X (t j ) is the energy spectrum count rate obtained at the jth acquisition point in the first energy zone of detector X, N 3X (t j ) is the energy spectrum count rate obtained at the jth acquisition point in the third energy zone of detector X, K 14X It represents the ratio of the energy spectrum counting rate generated by the thorium element in the detector X in the 4th energy zone to the energy spectrum counting rate generated in the 1st energy zone; K 34X It represents the ratio of the energy spectrum counting rate generated by uranium element in detector X in the 4th energy zone to the energy spectrum counting rate generated in the 3rd energy zone; Calculate the effective counting rate N of uranium element using formula (2) UX (t j ): N UX (t j )=N 2X (t j )-K 12X N 1X (t j )-K K2X N KX (t j ) (2); Where N 2X (t j ) is the energy spectrum count rate obtained at the jth acquisition point in the second energy region of detector X, K 12X It represents the ratio of the energy spectrum counting rate generated by thorium in the second energy zone to the energy spectrum counting rate generated in the first energy zone; K K2X It represents the ratio of the effective counting rate of potassium element to the energy spectrum counting rate generated by potassium element in the third energy region; Calculate the uranium ore grade Q using formula (3) U : In the formula, K UQ It is the conversion coefficient, which represents the total effective counting rate of uranium element measured by the uranium ore grade detection device of the moving mine car when the mine car is fully loaded with uranium ore of unit content.

2. The method for detecting uranium ore grade in a moving mine car capable of stripping thorium potassium radiation interference according to claim 1 is characterized in that: The energy range of the first energy region is [2.4MeV, 2.8MeV]; The energy range of the second energy region is [0.4MeV, 2.3MeV]; The energy range of the third energy region is [1.6MeV, 1.9MeV]; The energy range of the 4th energy region is [1.3MeV, 1.55MeV].

3. The method for detecting uranium ore grade in a moving mine car capable of stripping thorium potassium radiation interference according to claim 1 is characterized in that: A uranium ore grade detection device for a moving mine car comprises a mounting bracket arranged on a mine car travel route, a main gamma detector is arranged just above the central axis of the mine car position area, a first auxiliary gamma detector is arranged just above the left boundary of the mine car position area, and a second auxiliary gamma detector is arranged just above the right boundary of the mine car position area, and the first auxiliary gamma detector, the second auxiliary gamma detector and the main gamma detector are on the same plane.

4. The method for detecting uranium ore grade in a moving mine car capable of stripping thorium potassium radiation interference according to claim 3 is characterized in that: The distance between the main gamma detector and the top of the ore is greater than 1m.

5. The method for detecting uranium ore grade in a moving mine car capable of stripping thorium potassium radiation interference according to claim 3 is characterized in that: A first infrared counter-radiation sensor transmitting end and a second infrared counter-radiation sensor transmitting end are arranged on one side of the mine car position area, and a first infrared counter-radiation sensor receiving end and a second infrared counter-radiation sensor receiving end are arranged on the other side of the mine car position area.

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