Method for detecting grade of uranium ore in movable mine car which can peel off thorium-potassium radiation interference

Abstract

The application discloses a method for detecting the grade of uranium ore on a movable mine car, which can peel off the interference of thorium / potassium radiation, and the method comprises the following steps: when the mine car passes through a movable mine car uranium ore grade detection device, gamma detectors arranged above the center of the mine car and at the boundary positions on both sides of the mine car are used to collect gamma energy spectrum data respectively; each gamma energy spectrum data is divided into four energy regions; four energy spectrum traffic curves are constructed by the energy spectrum count rates of the four energy regions of each collection point; the effective count rate of the uranium element is obtained through the energy spectrum traffic curves, so that the grade of the uranium ore is obtained. The application can peel off the interference of thorium / potassium radiation, and has the characteristics of high detection efficiency, effective peeling off of the interference of thorium / potassium radiation and the like.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of nuclear technology application, and particularly relates to a method for detecting the grade of uranium ore in a moving mine car which can strip off the interference of thorium-potassium radiation. BACKGROUND

[0002] The mine car uranium ore grade detection equipment plays a crucial role in the industry chain of uranium ore mining and transportation. The mine car uranium ore grade detection equipment uses advanced detection technology to accurately measure the ore in the mine car and accurately determine the grade of the ore by analyzing the natural characteristics of the ore. Through real-time monitoring and data analysis of the mine car uranium ore grade detection equipment, enterprises can timely understand the grade change of the ore, thereby optimizing the mining plan and production process, and ensuring the effective use of resources and the sustainability of production.

[0003] Currently, the mine car uranium ore grade detection equipment widely used at home and abroad is mostly based on fixed measurement. 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 in the mine car is accurately obtained through high-precision radioactive scanning station. However, this measurement method faces a series of challenges in actual operation. First, due to driver operation, size difference of the mine car, and environmental factors, the mine car is difficult to accurately park at the designated position every time, which often leads to an increase in measurement error and affects the accuracy of the data. Second, the mine car needs to be completely stopped 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 quantity type uranium grade quantitative technology is interfered by thorium-potassium radiation, resulting in a large deviation in the calculation result of the grade.

[0004] In summary, although the fixed measurement method has a wide application basis in the field of ore grade detection, it still faces the problems of low operating efficiency, large measurement error, and susceptibility to thorium / potassium radiation interference in actual operation. SUMMARY

[0005] The purpose of the present application 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 which can strip off the interference of thorium-potassium radiation. This method can effectively strip off the interference of thorium / potassium radiation and realize real-time detection of the grade of the mine car during driving. This method avoids the inconvenience of stopping and starting the mine car, reduces the error caused by inaccurate parking position, and significantly improves the detection efficiency and accuracy. This method provides timely and accurate grade information for mining production, which is of great significance for improving the efficiency of mining production and resource utilization.

[0006] The purpose of the present application is achieved by the following technical solution: a method for detecting the grade of uranium ore in a moving mine car which can strip off the interference of thorium-potassium radiation, the process being as follows:

[0007] When the mine car passes through the moving mine car uranium ore grade detection device, gamma probe is arranged above the center of the mine car and at the boundary position on both sides to respectively collect gamma energy spectrum data;

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

[0009] Four energy spectrum traffic curves are constructed from the energy spectrum count rates of the four energy regions of each collection point, and are denoted as: {N iX (t j )},t j is the jth collection point time, N iX (t j ) represents the energy spectrum count rate obtained by the i energy region of detector X at the jth collection point.

[0010] The effective count rate N KX (t j ) of the potassium element is calculated by formula (1), and if N KX (t j ) is less than zero, 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] In the formula, N 4X (t j ) is the energy spectrum count rate obtained by the fourth energy region of detector X at the jth collection point, N 1X (t j ) is the energy spectrum count rate obtained by the first energy region of detector X at the jth collection point, N 3X (t j ) is the energy spectrum count rate obtained by the third energy region of detector X at the jth collection point, and K 14X represents the ratio of the energy spectrum count rate generated by the thorium element in the fourth energy region to the energy spectrum count rate generated by the first energy region of detector X.34X represents the ratio of the energy spectrum count rate of the uranium element generated in the 4th energy region to the energy spectrum count rate generated in the 3rd energy region in the detector X;

[0013] The effective count rate N of the uranium element is calculated by 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] In the formula, N 2X (t j ) is the energy spectrum count rate obtained by the 2nd energy region of the detector X at the jth acquisition point, K 12X represents the ratio of the energy spectrum count rate of the thorium element generated in the 2nd energy region to the energy spectrum count rate generated in the 1st energy region; K K2X represents the ratio of the effective count rate of the potassium element to the energy spectrum count rate of the potassium element generated in the 3rd energy region.

[0016] The uranium ore grade Q U is calculated by formula (3)

[0017]

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

[0019] Specifically, the energy range of the 1st energy region is [2.4 MeV, 2.8 MeV];

[0020] The energy range of the 2nd energy region is [0.4 MeV, 2.3 MeV];

[0021] The energy range of the 3rd energy region is [1.6 MeV, 1.9 MeV];

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

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

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

[0025] Further preferably, a first infrared opposite emission sensor emitter and a second infrared opposite emission sensor emitter are arranged on one side of the mine car position area, and a first infrared opposite emission sensor receiver and a second infrared opposite emission sensor receiver are arranged on the other side of the mine car position area.

[0026] The uranium ore grade detection device for moving mine car has the advantages of measuring the uranium grade of the loaded ore during the driving of the mine car, automatically deducting the influence of the thorium and potassium element radiation on the measurement result, improving the detection efficiency, reducing the production cost, and realizing the automatic processing through computer programming. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the present application, the following briefly introduces the drawings needed in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

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

[0029] Figure 2 FIG. 2 is a flow chart of the method of the present application;

[0030] Figure 3 FIG. 3 is a schematic diagram of gamma spectrum curve, energy peak and energy region division scheme; Figure 4 FIG. 4 is a through curve of the first energy region of Example 1;

[0031] Figure 5 FIG. 5 is a through curve of the second energy region of Example 1;

[0032] Figure 6 FIG. 6 is a through curve of the third energy region of Example 1;

[0033] Figure 7 FIG. 7 is a through curve of the fourth energy region of Example 1;

[0034] Figure 8 Traffic curve of effective count rate of uranium element for example 1; DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0036] In order to make the above-mentioned purposes, characteristics and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0037] Example 1

[0038] As Figure 1 shown, the moving mine car uranium ore grade detection device includes a mounting bracket arranged on a mine car driving route, a first infrared opposite-throw sensor emitting end 1 and a second infrared opposite-throw sensor emitting end 3 arranged on one side of a mine car position area through the mounting bracket, a first infrared opposite-throw sensor receiving end 2 and a second infrared opposite-throw sensor receiving end 4 arranged on the other side of the mine car position area, a main gamma detector 5 arranged directly above the central axis of the mine car position area, the distance between the main gamma detector 5 and the top end of the ore being greater than 1 m, a first auxiliary gamma detector 6 arranged directly above the left boundary of the mine car position area, and a second auxiliary gamma detector 7 arranged directly above the right boundary of the mine car position area, the first auxiliary gamma detector 6 and the second auxiliary gamma detector 7 being on the same plane as the main gamma detector 5. The gamma detector can obtain gamma energy spectrum data, the energy resolution being better than 8% 662keV, the total channel number being greater than 1024 channels, and the detection range covering 0-3MeV.

[0039] With reference to Figure 2 , a moving mine car uranium ore grade detection method capable of stripping thorium potassium radiation interference, comprising:

[0040] Gamma energy spectrum data acquisition: when the mine car passes through the moving mine car uranium ore grade detection device and blocks the infrared opposite-throw sensor, three gamma detectors are started to periodically acquire gamma energy spectrum data at a time interval of 1 second. During the gamma energy spectrum data acquisition process, the three independent gamma detectors are respectively responsible for recording and saving the gamma energy spectrum data; once the mine car drives away and removes the blockage of the infrared opposite-throw sensor, the acquisition of the gamma energy spectrum data is immediately stopped;

[0041] Gamma energy spectrum data processing:

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

[0043] The first energy region, with an energy range of [2.4 MeV, 2.8 MeV], reflects the characteristic peak of the high-energy region of thorium elements, mainly covering the maximum characteristic peak 2.615 MeV of thorium;

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

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

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

[0047] S2, four energy spectrum curves are constructed from the energy spectrum count rates of the four energy regions of each acquisition point, denoted as: {N iX (t j )}, wherein i = 1, …, 4; j = 1, 2, …, n; X = 1, 2, 3; i is the serial number of the four energy regions; j is the serial number of the acquisition point, and n is the number of acquisition points; X is the detector number; t j is the jth acquisition point time, N iX (t j ) represents the energy spectrum count rate obtained by the ith energy region of detector X at the jth acquisition point, and the four energy spectrum curves obtained in this embodiment are as shown in Figures 4 to 7 ;

[0048] S3, the effective count rate N KX (t j ) of the potassium element is calculated by formula (1), if N KX (t j ) is less than zero, then 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] In the formula, N4X (t j ) is the energy spectrum count rate obtained by the 4th energy region of the detector X at the jth acquisition point, N 1X (t j ) is the energy spectrum count rate obtained by the 1st energy region of the detector X at the jth acquisition point, N 3X (t j ) is the energy spectrum count rate obtained by the 3rd energy region of the detector X at the jth acquisition point, K 14X represents the ratio of the energy spectrum count rate generated by the thorium element in the 4th energy region to the energy spectrum count rate generated by the 1st energy region in the detector X; K 34X represents the ratio of the energy spectrum count rate generated by the uranium element in the 4th energy region to the energy spectrum count rate generated by the 3rd energy region in the detector X;

[0051] Since the N KX (t j ) obtained in the embodiment is less than zero, N KX (t j ) = 0.

[0052] S4, calculate the effective count rate N UX (t j ) of the uranium element by formula (2):

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

[0054] In the formula, N 2X (t j ) is the energy spectrum count rate obtained by the 2nd energy region of the detector X at the jth acquisition point, K 12X represents the ratio of the energy spectrum count rate generated by the thorium element in the 2nd energy region to the energy spectrum count rate generated by the 1st energy region; K K2X represents the ratio of the effective count rate of the potassium element to the energy spectrum count rate generated by the potassium element in the 3rd energy region; the effective count rate N UX (t j ) of the uranium element obtained in the embodiment is shown in Table 2; Figure 8

[0055] S5, calculate the uranium ore grade Q U :

[0056]

[0057] In the formula, K​UQ is the total effective count rate of uranium element measured by the uranium ore grade detection device of the moving mine car when the mine car is full of unit uranium ore. In this embodiment, the uranium ore grade Q U = 172.01 g / .

[0058] In the present application, K 14X , K 34X , K 12X , K K2X , K UQ is affected by the performance of the detector, the installation height of the detector, the shape of the mine car hopper, and other factors, but for the measurement of the fixed car type of the moving mine car uranium ore grade detection device, the above parameters are fixed, so this parameter can be obtained by comparing the instrument scale.

[0059] The above-described embodiments are only descriptions of the preferred modes of the present application and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those of ordinary skill in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A method for detecting the grade of uranium ore in a moving mine car that is interfered by thorium-potassium radiation, characterized in that: when the mine car passes through the moving mine car uranium ore grade detection device, gamma detector is arranged above the center of the mine car and on both sides of the boundary position to collect gamma spectrum data respectively; each gamma spectrum data is divided into four energy regions: the first energy region is a thorium characteristic energy region covering the maximum characteristic peak of thorium 2.615 MeV; the second energy region is a uranium, thorium and potassium high energy region covering the characteristic peaks of uranium 2.20 MeV and 1.765 MeV; the third energy region is a uranium characteristic energy region covering the maximum characteristic peak of uranium 1.765 MeV; the fourth energy region is a potassium characteristic energy region covering the only characteristic peak of potassium 1.461 MeV.

2. The method for detecting the grade of uranium ore in a moving mine car that is interfered by thorium-potassium radiation according to claim 1, characterized in that: the energy range of the first energy region is [2.4 MeV, 2.8 MeV]; Four energy spectrum curves are constructed from the energy spectrum count rates of the four energy regions of each acquisition point, and are denoted as: {N iX (t j )}, t j is the time of the jth acquisition point, and N iX (t j ) represents the energy spectrum count rate obtained by the ith energy region of the detector X at the jth acquisition point; The effective count rate N of potassium element is calculated by formula (1) KX (t j ), if N KX (t j ) is less than zero, 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 by the 4th energy region of the detector X at the jth acquisition point, N 1X (t j ) is the energy spectrum count rate obtained by the 1st energy region of the detector X at the jth acquisition point, N 3X (t j ) is the energy spectrum count rate obtained by the 3rd energy region of the detector X at the jth acquisition point, K 14X represents the ratio of the energy spectrum count rate generated by the thorium element in the 4th energy region to the energy spectrum count rate generated by the 1st energy region in the detector X; K 34X represents the ratio of the energy spectrum count rate generated by the uranium element in the 4th energy region to the energy spectrum count rate generated by the 3rd energy region in the detector X. The effective count rate N of the uranium element is calculated by 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 by the second energy region of the detector X at the jth acquisition point, K 12X represents the ratio of the energy spectrum count rate generated by the thorium element in the second energy region to the energy spectrum count rate generated in the first energy region; K K2X represents the ratio of the effective count rate of the potassium element to the energy spectrum count rate generated by the potassium element in the third energy region; The uranium ore grade Q is calculated using equation (3) U : In the formula, K UQ is a conversion factor, representing the total effective count 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 unit content of uranium ore. the energy range of the second energy region is [0.4 MeV, 2.3 MeV]; the energy range of the third energy region is [1.6 MeV, 1.9 MeV]; the energy range of the fourth energy region is [1.3 MeV, 1.55 MeV]. The moving mine car uranium ore grade detection device includes a mounting bracket arranged on the mine car driving route, a main gamma detector arranged above the center axis of the mine car position area, a first auxiliary gamma detector arranged above the left boundary of the mine car position area, and a second auxiliary gamma detector arranged 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 in the same plane. The distance between the main gamma detector and the top of the ore is greater than 1 m.

3. A method of detecting the grade of uranium ore in a moving mine car that is resistant to thorium-potassium radiation interference, according to claim 1, characterized in that: A first infrared opposite radiation sensor emitter and a second infrared opposite radiation sensor emitter are arranged on one side of the mine car position area, and a first infrared opposite radiation sensor receiver and a second infrared opposite radiation sensor receiver are arranged on the other side of the mine car position area.

4. A method of detecting the grade of uranium ore in a moving mine car that is shielded from thorium-potassium radiation interference, according to claim 3, characterized in that: ​ 5. A method of detecting the grade of uranium ore in a moving mine car that is shielded from thorium-potassium radiation interference, as claimed in claim 3, wherein: ​

Images