CN109632854B - Massive uranium ore multi-element online X fluorescence analyzer with double detection structures - Google Patents

Abstract

The invention relates to a bulk uranium ore multi-element online X-fluorescence analyzer with double detection structure, which is composed of an excitation light source, a dual detection and analysis device, a transmission belt and auxiliary equipment. The collimator at the outlet of the light tube and the high voltage of the X-ray tube; the X-rays emitted by the excitation light source vertically irradiate the bulk uranium ore sample on the conveyor belt, and after exciting the multi-element characteristic X-fluorescence information at different positions in the bulk uranium ore sample, the Dual detection devices with different detection structures receive. Through the coupling model of the dual detection structure, the influence of the geometric effect caused by the uneven surface of the massive uranium ore on the accuracy of the online X-ray fluorescence analyzer can be overcome, and the analysis accuracy of the online X-ray fluorescence analyzer can be improved. The operation is simple and the measurement is fast. , high precision, safety and environmental protection.

Description

A multi-element online X-ray fluorescence analyzer for bulk uranium ore with dual detection structure

Technical field:

The invention relates to a bulk uranium ore multi-element online X-fluorescence analyzer with double detection structure, in particular to an online X-fluorescence analyzer for analyzing the multi-element content in a bulk sample, which belongs to the field of rapid analysis of uranium ore elements.

Background technique:

Uranium ore is a strategic resource in my country, and rapid online measurement of uranium ore grade is particularly important. However, most of them are based on chemical analysis methods. Generally, the samples need to be burned at high temperature, and then chemical reagents are used to react with them to calculate the uranium ore content. This method based on chemical analysis requires a long measurement time due to the strict sample preparation process. Due to the need to use chemical reagents, it will cause serious pollution to the environment and damage to the health of users.

On-line X-ray Fluorescence (XRF) analysis technology has broad application prospects in real-time on-line measurement of uranium ore due to its advantages of real-time on-line, convenient, rapid, and non-destructive measurement. In laboratory XRF analysis, different sample preparation methods (such as tableting, melting, digestion, etc.) are usually used to eliminate the interference caused by the sample itself, but online XRF analysis technology is a direct measurement of unknown samples on site, and there is no sample preparation process. Therefore, the interference factors of the accuracy of the online XRF analysis technology mainly come from the sample itself, such as the uneven surface (geometric effect) of different shapes and sizes, and the complex composition of the sample. At the same time, in order to improve the accuracy of XRF online measurement of bulk materials, the above interference factors must be corrected. In laboratory analysis, this effect can be eliminated by specific sample preparation methods such as melting and digestion, but online XRF analysis does not have a sample preparation process. Therefore, for bulk materials, it is necessary to improve the measurement accuracy of online XRF analysis technology to solve the problem. The geometric effect is urgent.

Therefore, it is indeed necessary to improve the existing technology to solve the shortcomings of the existing technology.

Invention content:

The invention provides a massive uranium ore multi-element online X-fluorescence analyzer with double detection structure without chemical pollution, without radioactive pollution, short measurement time, high precision, simple structure, safety and reliability.

The present invention adopts the following technical scheme: a bulk uranium ore multi-element online X-fluorescence analyzer with dual detection structure, the analyzer includes an excitation light source, a dual detection analysis device, a transmission belt, and auxiliary equipment, and the excitation light source includes X-rays Tube and X-ray tube are high pressure, auxiliary equipment includes boat-shaped sled scraper and laser range finder, the boat-shaped sled scraper is fixed above the conveyor belt, the laser range finder is set on one side of the boat-shaped sled scraper, X-ray tube and The high-voltage X-ray tube is set on the scraper of the boat-shaped sled. The dual detection and analysis device includes two detection systems: a reflection detection system and a transmission detection system. The reflection detection system includes a silicon drift detector, a detector high voltage, and a A charge-sensitive preamplifier connected to the silicon drift detector, a pulse shaping amplifier connected to the charge-sensitive preamplifier, and a digital multi-channel spectrometer connected to the pulse shaping amplifier, the silicon drift detector is on one side of the X-ray tube; transmission type The detection system includes a cadmium telluride detector, a detector high voltage, a charge sensitive preamplifier connected with the cadmium telluride detector, a pulse shaping amplifier connected with the charge sensitive preamplifier, and a digital multi-channel spectrometer connected with the pulse shaping amplifier , the cadmium telluride detector is below the transmission belt; the energy spectrum information collected by the dual detection system is converted into the energy spectrum for analysis and controlled by the computer for data processing; the transmission belt is used for online transportation of bulk uranium ore samples The ship-shaped sled scraper uses the principle of physical gravity to flatten the larger bulk uranium ore samples, and the laser range finder assists in judging the geometric changes of the bulk uranium ore, providing a basis for different detection systems.

The reflective detection system and the transmission detection system use a laser rangefinder to assist in judging the geometric change of the massive uranium ore. When the geometric change of the massive uranium ore is within 20mm, the reflective measurement is used. On the bulk uranium ore sample, the characteristic X fluorescence information of the uranium ore is excited, and the fluorescence information is received by the silicon drift detector. When the geometric variation range of the massive uranium ore is 20mm--100mm, the transmission type plays a role. When the X-ray emitted by the X-ray tube is irradiated on the massive uranium ore sample, the characteristic X fluorescence information of the uranium ore is excited. , the fluorescence information is received by the cadmium telluride detector, and after being shaped and amplified by the charge-sensitive preamplifier and the pulse shaping amplifier, it is converted into the energy spectrum for analysis by the digital multi-channel spectrometer; the computer analyzes the distance information of the laser rangefinder, Using the detection response of different detectors to X-fluorescence and the penetrating ability of characteristic X-fluorescence information of different energies, a coupled model of dual detection structure is established to overcome the geometric effect caused by the uneven surface of the massive uranium ore, which has a negative impact on the multi-element in the sample. The influence of characteristic X fluorescence intensity improves the analysis accuracy of online X fluorescence analyzer.

The beryllium window of the silicon drift detector is 0.4 mm, and the detection range is 1-30 keV.

The beryllium window of the cadmium telluride detector is 0.5 mm, and the detection range is 20-100 keV.

The laser range finder has a range of 0-100mm and an accuracy of 0.07mm. It is fixed on the ship-shaped sled scraper to assist in judging the geometric changes of massive uranium ore, and provides a basis for different detection systems.

The high voltage of the X-ray tube is 80,000 volts.

The distance between the silicon drift detector and the bulk uranium ore sample is 6 mm, and the included angle is 90 degrees.

The distance between the cadmium telluride detector and the bulk uranium ore sample is 5 mm, and the included angle is 90 degrees.

The boat-shaped ski scraper adopts a steel plate with a thickness of 5mm, and the weight is greater than or equal to 100kg.

The thickness of the conveyor belt is 5mm.

The invention has the following beneficial effects: compared with the existing X-ray fluorescence equipment, a high-power X-ray tube is used as the excitation light source, and no chemical pollution and radioactive pollution are produced; The geometric effect caused by the uneven surface of uranium ore affects the characteristic X-fluorescence intensity of multiple elements in the sample, and improves the analysis accuracy of the online X-fluorescence analyzer; due to the use of the more advanced silicon drift and cadmium telluride detectors and many It uses a laser range finder to monitor the change degree of the sample surface in real time, so as to improve the analysis accuracy of the online X-ray fluorescence analyzer; the present invention does not need to manufacture The sample process is directly measured online, with fast speed and accurate results.

Description of drawings:

Fig. 1 is a working principle diagram of the present invention.

FIG. 2 is an energy spectrum diagram of the silicon drift detection system of the present invention.

FIG. 3 is an energy spectrum diagram of the cadmium telluride detector system of the present invention.

in:

1- X-ray tube; 2- Light tube high voltage; 3- Silicon drift detector; 4- Detector high voltage; 5- Charge sensitive preamplifier; 6- Pulse shaping amplifier; 7- Cadmium telluride detector; 8- Detection 9-charge sensitive preamplifier; 10-pulse shaping amplifier; 11-digital multi-channel spectrometer; 12-laser rangefinder; 13-transmission belt; 14-uranium ore sample; 15-boat sled scraper; 16 - Computer.

Detailed ways:

Please refer to FIG. 1 to FIG. 3 , a bulk uranium ore multi-element online X-ray fluorescence analyzer with dual detection structure, which includes an excitation light source, a dual detection analysis device, a transmission belt, and auxiliary equipment, and the excitation light source includes X High voltage of light tube and X-ray tube; the double detection and analysis device includes two detection systems (reflection type and transmission type). A charge-sensitive pre-amplifier connected to the detector, a pulse-shaping amplifier connected to the charge-sensitive pre-amplifier, and a digital multi-channel spectrometer connected to the pulse-shaping amplifier, the transmission detection system includes a cadmium telluride detector below the transmission belt, a detection high voltage, charge sensitive preamplifier connected to the cadmium telluride detector, pulse shaping amplifier connected to the charge sensitive preamplifier, and digital multi-channel spectrometer connected to the pulse shaping amplifier, the energy spectrum information collected by the dual detection system is all It is converted into energy spectrum for analysis and controlled by computer for data processing; the conveyor belt is mainly used for online transportation of bulk uranium ore samples; auxiliary equipment includes ship-shaped sled scraper and laser range finder, and the ship-shaped sled scraper is used for The online X-ray fluorescence analyzer is fixed and the larger bulk uranium ore samples are flattened by the principle of physical gravity, and the laser rangefinder is used to assist in judging the geometric changes of the bulk uranium ore, providing a basis for different detection systems.

In the present invention, a dual detection structure (reflection type and transmission type) is proposed, and a laser range finder is used to assist in judging the geometric change of the massive uranium ore. The emitted X-rays are irradiated on the bulk uranium ore sample to excite the characteristic X-fluorescence information of the uranium ore. The fluorescence information is received by the silicon drift detector. It is converted into an energy spectrum for analysis; when the geometric variation range of the massive uranium ore is 20mm--100mm, the transmission type plays a major role. The characteristic X fluorescence information of the ore, the fluorescence information is received by the cadmium telluride detector, shaped and amplified by the charge-sensitive preamplifier and the pulse shaping amplifier, and then converted into the energy spectrum for analysis by the digital multi-channel spectrometer; The distance information from the instrument, the detection response of different detectors to X-fluorescence and the penetrating ability of characteristic X-fluorescence information of different energies are used to establish a coupling model of dual detection structure to overcome the geometric effect caused by the uneven surface of massive uranium ore The influence on the characteristic X fluorescence intensity of multiple elements in the sample improves the analysis accuracy of the online X fluorescence analyzer.

The working principle of the massive uranium ore multi-element on-line X-fluorescence analyzer with dual detection structure of the present invention is as follows: a dual detection structure (reflection type and transmission type) is proposed in the present invention, and a laser range finder is used to assist in judging the geometry of the massive uranium ore. When the geometric change of the massive uranium ore is within 20mm, the reflection measurement is adopted. When the X-ray emitted by the X-ray tube is irradiated on the massive uranium ore sample, the characteristic X-fluorescence information of the uranium ore is excited, and the fluorescence information is detected by the silicon drift. It is received by the digital multi-channel spectrometer after being shaped and amplified by the charge-sensitive preamplifier and the pulse shaping amplifier, and converted into an energy spectrum for analysis; when the geometric variation range of the massive uranium ore is 20mm--100mm, the transmission type plays the role of The main function is that when the X-ray emitted by the X-ray tube is irradiated on the bulk uranium ore sample, the characteristic X-fluorescence information of the uranium ore is excited, and the fluorescence information is received by the cadmium telluride detector and shaped by the charge-sensitive preamplifier and pulse shaping amplifier. After amplification, it is converted into an energy spectrum for analysis by a digital multi-channel spectrometer; the computer analyzes the distance information of the laser rangefinder, uses the detection response of different detectors to X-fluorescence and the penetration ability of characteristic X-fluorescence information of different energies A coupling model of the dual detection structure was established to overcome the influence of the geometric effect caused by the uneven surface of the massive uranium ore on the characteristic X-fluorescence intensity of multiple elements in the sample, and to improve the analysis accuracy of the online X-fluorescence analyzer.

Example 1:

1. The silver target X-ray tube 1 of Dandong Dongfang Electron Tube Factory is used, and the high voltage 2 of the X-ray tube is set to 80,000 volts, which can effectively excite the characteristic X-ray fluorescence of multi-elements in the uranium ore; the distance between the X-ray tube 1 and the surface of the sample 14 is 50mm.

2. The angle between the SDD-123 silicon drift detector 3 and the surface of the sample is 90 degrees, and the distance is 6 mm. These are to ensure that the analyzer can obtain better resolution.

3. The angle between the cadmium telluride detector 7 and the surface of the sample is 90 degrees and the distance is 6 mm. These are to ensure that the analyzer can obtain better resolution.

4. The excitation light source, detection system and digital multi-channel spectrometer 11 are fixed on a 5 mm boat-shaped sled scraper, and the larger bulk uranium ore sample is flattened by the principle of physical gravity.

5. The laser light source is the LOD infrared laser of Shanghai Beile. The laser light source emits infrared light, and the laser light source emits infrared light, which shines on the sample stage to monitor the change data of the sample surface in real time.

6. Configure a 10kg uranium ore sample and measure the sample for 100s.

7. The signal collected by the silicon drift detector 3 is amplified by the pulse shaping amplifier 6, and then converted into an energy spectrum that can be used for analysis by the digital multi-channel spectrometer 11 (as shown in Figure 2), and then the data is processed by the computer to obtain the medium uranium. The content of low atomic number elements in the ore.

8. The signal collected by the cadmium telluride detector 7 is amplified by the pulse shaping amplifier 6, and then converted into an energy spectrum that can be used for analysis by the digital multi-channel spectrometer 11 (as shown in Figure 3), and then the data is processed by the computer. The content of high atomic number elements in uranium ore.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several improvements can be made without departing from the principles of the present invention, and these improvements should also be regarded as the present invention. scope of protection.

Claims (9)

1. A massive uranium ore multi-element online X-ray fluorescence analyzer with dual detection structure, characterized in that: the analyzer comprises an excitation light source, a dual detection analysis device, a transmission belt (13), and auxiliary equipment, and the excitation light source includes X-ray tube (1), X-ray tube high pressure (2), auxiliary equipment including boat-shaped sled scraper (15) and laser range finder (12), the boat-shaped sled scraper (15) is fixed on the conveyor belt (13) Above, the laser range finder (12) is arranged on one side of the boat-shaped sled scraper (15), the X-ray tube (1) and the X-ray tube high pressure (2) are arranged on the boat-shaped sled scraper, the double detection and analysis device It includes two detection systems: a reflection detection system and a transmission detection system. The reflection detection system includes a silicon drift detector (3), a high voltage detector (4), and a charge-sensitive front-end connected to the silicon drift detector (3). Amplifier (5), pulse shaping amplifier (6) connected with charge sensitive preamplifier (5) and digital multi-channel spectrometer (11) connected with pulse shaping amplifier (6), silicon drift detector (3) in X One side of the light pipe (1); the transmissive detection system includes a cadmium telluride detector (7), a detector high voltage (8), a charge sensitive preamplifier (9) connected to the cadmium telluride detector (7), A pulse shaping amplifier (10) connected with the charge sensitive preamplifier (9) and a digital multi-channel spectrometer (11) connected with the pulse shaping amplifier (10), a cadmium telluride detector (7) in the transmission zone (13) The energy spectrum information collected by the dual detection system is converted into the energy spectrum for analysis and controlled by the computer (16) for data processing; the conveyor belt (13) is used for online transportation of the lump uranium ore sample (14). ; The ship-shaped sled scraper (15) uses the principle of physical gravity to flatten the larger bulk uranium ore sample (14), and the laser range finder assists in judging the geometric change of the bulk uranium ore, providing a judgment basis for different detection systems; The detection system and the transmission type detection system use a laser range finder (12) to assist in judging the geometric change of the massive uranium ore (14). The X-rays are irradiated on the bulk uranium ore sample to excite the characteristic X-fluorescence information of the uranium ore. The fluorescence information is received by the silicon drift detector (3), and shaped by the charge-sensitive preamplifier (5) and the pulse shaping amplifier (6). After amplification, the digital multi-channel spectrometer (11) is converted into an energy spectrum for analysis; when the geometric variation range of the massive uranium ore is 20mm--100mm, the transmission type plays a role. When the X-ray emitted by the X-ray tube is irradiated On the bulk uranium ore sample, the characteristic X fluorescence information of the uranium ore is excited, and the fluorescence information is received by the cadmium telluride detector (7), shaped and amplified by the charge sensitive preamplifier (9) and the pulse shaping amplifier (10), The digital multi-channel spectrometer (11) is converted into an energy spectrum for analysis; the computer (16) utilizes the detection responses of different detectors to X-fluorescence and the characteristic X-fluorescence information of different energies by analyzing the distance information of the laser rangefinder. Penetration ability to establish a coupled model of a dual-detection structure to overcome block The geometric effect caused by the uneven surface of the uranium ore has the influence on the characteristic X-fluorescence intensity of multi-elements in the sample, and improves the analysis accuracy of the online X-fluorescence analyzer. 2 . The multi-element online X-ray fluorescence analyzer for massive uranium ore with dual detection structure according to claim 1 , wherein the beryllium window of the silicon drift detector (3) is 0.4 mm, and the detection range is 1- 30keV. 3. The massive uranium ore multi-element online X-ray fluorescence analyzer with dual detection structure according to claim 1, characterized in that: the beryllium window of the cadmium telluride detector (7) is 0.5 mm, and the detection range is 20 mm -100keV. 4. The multi-element online X-ray fluorescence analyzer for massive uranium ore with double detection structure as claimed in claim 1, characterized in that: the laser range finder (12) has a range of 0-100mm, an accuracy of 0.07mm, and is fixed on a ship shape The sled scraper (15) is used to assist in judging the geometric change of the massive uranium ore, which provides judgment basis for different detection systems. 5 . The multi-element online X-ray fluorescence analyzer of massive uranium ore with dual detection structure according to claim 1 , wherein the high voltage of the X-ray tube ( 1 ) is 80,000 volts. 6 . 6. The massive uranium ore multi-element online X-ray fluorescence analyzer with dual detection structure according to claim 2, characterized in that: the distance between the silicon drift detector (3) and the massive uranium ore sample (14) is 6 mm and the included angle is 90 degrees. 7. The massive uranium ore multi-element online X-fluorescence analyzer with dual detection structure according to claim 3, characterized in that: between the cadmium telluride detector (7) and the massive uranium ore sample (14) The distance is 5 mm and the included angle is 90 degrees. 8. The massive uranium ore multi-element online X-ray fluorescence analyzer with dual detection structure according to claim 4, characterized in that: the boat-shaped ski scraper (15) adopts a steel plate with a thickness of 5mm, and the weight is greater than or equal to 100kg. 9 . The massive uranium ore multi-element online X-fluorescence analyzer with dual detection structure according to claim 1 , wherein the thickness of the transmission belt ( 13 ) is 5 mm. 10 .

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