阅读说明：本技术 一种用于铀纯化过程的在线高浓度铀分析探测装置 (A online high concentration uranium analysis detecting device for uranium purification process ) 是由 李绍海 曹放 赵波 张红海 卓春凤 张慧妍 侯江 柳杰 于 2020-12-22 设计创作，主要内容包括：本发明属于铀纯化过程和铀水冶过程自动分析测量技术领域,具体涉及一种用于铀纯化过程的在线高浓度铀分析探测装置。碘化钠晶体设置于屏蔽部件中,碘化钠晶体下方耦合设置光电倍增管,光电倍增管下方设置电子线路,电子线路下方设置线缆,线缆穿过屏蔽部件,屏蔽部件上设置支撑架,支撑架与光电倍增管连接,碘化钠晶体上开有通孔,聚四氟乙烯管路穿过该通孔,聚四氟乙烯管路两端分别为溶液入口和溶液出口,溶液入口和溶液出口均过屏蔽部件。本发明适用于铀纯化过程和铀水冶过程自动分析的高浓度铀测量,测量溶液中的铀浓度,无需添加任何化学试剂。(The invention belongs to the technical field of automatic analysis and measurement in uranium purification process and uranium hydrometallurgy process, and particularly relates to an on-line high-concentration uranium analysis and detection device for uranium purification process. The sodium iodide crystal is arranged in the shielding part, the photomultiplier is arranged below the sodium iodide crystal in a coupling mode, an electronic circuit is arranged below the photomultiplier, a cable is arranged below the electronic circuit and penetrates through the shielding part, a supporting frame is arranged on the shielding part and connected with the photomultiplier, a through hole is formed in the sodium iodide crystal, a polytetrafluoroethylene pipeline penetrates through the through hole, the two ends of the polytetrafluoroethylene pipeline are respectively provided with a solution inlet and a solution outlet, and the solution inlet and the solution outlet are respectively connected with the shielding part. The method is suitable for high-concentration uranium measurement of automatic analysis in the uranium purification process and the uranium hydrometallurgy process, and the uranium concentration in the solution is measured without adding any chemical reagent.)

1. The utility model provides an online high concentration uranium analysis detecting device for uranium purification process which characterized in that: the sodium iodide crystal is arranged in the shielding part, the photomultiplier is arranged below the sodium iodide crystal in a coupling mode, an electronic circuit is arranged below the photomultiplier, a cable is arranged below the electronic circuit and penetrates through the shielding part, a supporting frame is arranged on the shielding part and connected with the photomultiplier, a through hole is formed in the sodium iodide crystal, a polytetrafluoroethylene pipeline penetrates through the through hole, the two ends of the polytetrafluoroethylene pipeline are respectively provided with a solution inlet and a solution outlet, and the solution inlet and the solution outlet are respectively connected with the shielding part.

2. The on-line high-concentration uranium analysis and detection device for a uranium purification process according to claim 1, wherein: dissolved diuranate and U flow through the polytetrafluoroethylene pipeline₃O₈Or the extracted saturated organic phase solution, gamma rays emitted by uranium-235 in the solution are detected by sodium iodide crystals, and the content of total uranium is obtained according to the detection result.

3. The on-line high-concentration uranium analysis and detection device for a uranium purification process according to claim 1, wherein: under the shielding effect of the shielding component, the sodium iodide crystal, the photomultiplier and part of the polytetrafluoroethylene pipeline eliminate the influence of natural radionuclides of uranium, thorium, radium and potassium existing in the external environment and gamma rays generated by a large amount of uranium solution in a working place on the measurement process.

4. The on-line high-concentration uranium analysis and detection device for a uranium purification process according to claim 1, wherein: when the solution flows through the sodium iodide crystal through the polytetrafluoroethylene pipeline, the gamma ray generated by uranium-235 in the uranium solution in the through hole, except the opening direction, in a 4 pi solid angle, the sodium iodide crystal can be detected, the gamma ray generated by uranium-235 in the solution irradiates the sodium iodide crystal, finally, exciting light is generated on the sodium iodide crystal, an electric signal is generated through the photomultiplier, the electric signal is further transmitted to an external signal processing unit, amplitude analysis and discrimination are carried out, so that the required information is obtained, and finally, the required information is converted into uranium concentration.

5. The on-line high-concentration uranium analysis and detection device for a uranium purification process according to claim 1, wherein: the polytetrafluoroethylene pipeline is led out of the shielding component in a reverse folding mode.

Technical Field

The invention belongs to the technical field of automatic analysis and measurement in uranium purification process and uranium hydrometallurgy process, and particularly relates to an on-line high-concentration uranium analysis and detection device for uranium purification process.

Background

In uranium purification processes, diuranates and U₃O₈And the like are dissolved and further purified, the concentration of uranium in the solution is higher in the process, and the current analysis methods mainly comprise laboratory colorimetric analysis, spectrophotometry, manual titration, soft gamma absorption and the like. Although the colorimetric method realizes on-line analysis, the measurement of high-concentration uranium solution requires dilution and consumption of a large amount of reagents, and personnel are required to prepare and manage the reagents, so that the colorimetric method is not suitable for the current unattended development direction; the soft gamma absorption process is also sensitive to high concentrations of acids in solution and requires the use of radioactive sources²⁴¹Am, increasing the work of the user in managing the radiation source. Therefore, the on-line high-concentration uranium analysis and detection device for the uranium purification process is developed, unattended uranium concentration monitoring is achieved, automation is achieved in the uranium purification process, and the device has important significance.

Disclosure of Invention

The invention aims to provide an on-line high-concentration uranium analysis and detection device for a uranium purification process, which is suitable for high-concentration uranium measurement of automatic analysis in the uranium purification process and the uranium hydrometallurgy process, and is used for measuring the uranium concentration in a solution without adding any chemical reagent. Because the uranium concentration ratio of surveying is higher, and its radioactive intensity is also higher, through the structural design to the sodium iodide crystal, improves the detection efficiency of uranium emission ray in the solution, and then carries out analysis and survey to the uranium concentration in the solution. The method has the advantages of no need of adding any chemical reagent in the measuring process, no pollution to the measured solution, no generation of extra waste, environmental protection, reduction of labor intensity of personnel and convenience in realizing unattended automatic measurement.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the utility model provides an online high concentration uranium analysis detection device for uranium purification process, the sodium iodide crystal sets up in shielding part, the coupling of sodium iodide crystal below sets up photomultiplier, photomultiplier sets up the electronic circuit below, the electronic circuit below sets up the cable, the cable passes shielding part, the last support frame that sets up of shielding part, the support frame is connected with photomultiplier, it has the through-hole to open on the sodium iodide crystal, the polytetrafluoroethylene pipeline passes this through-hole, polytetrafluoroethylene pipeline both ends are solution entry and solution export respectively, solution entry and solution export are all crossed shielding part.

Dissolved diuranate and U flow through the polytetrafluoroethylene pipeline₃O₈Or the extracted saturated organic phase solution, gamma rays emitted by uranium-235 in the solution are detected by sodium iodide crystals, and the content of total uranium is obtained according to the detection result.

Under the shielding effect of the shielding component, the sodium iodide crystal, the photomultiplier and part of the polytetrafluoroethylene pipeline eliminate the influence of natural radionuclides of uranium, thorium, radium and potassium existing in the external environment and gamma rays generated by a large amount of uranium solution in a working place on the measurement process.

When the solution flows through the sodium iodide crystal through the polytetrafluoroethylene pipeline, the gamma ray generated by uranium-235 in the uranium solution in the through hole, except the opening direction, in a 4 pi solid angle, the sodium iodide crystal can be detected, the gamma ray generated by uranium-235 in the solution irradiates the sodium iodide crystal, finally, exciting light is generated on the sodium iodide crystal, an electric signal is generated through the photomultiplier, the electric signal is further transmitted to an external signal processing unit, amplitude analysis and discrimination are carried out, so that the required information is obtained, and finally, the required information is converted into uranium concentration.

The polytetrafluoroethylene pipeline is led out of the shielding component in a reverse folding mode.

The beneficial effects obtained by the invention are as follows:

using measurements²³⁵The uranium concentration is measured by the gamma energy peak area of 185keV of U, and the detection efficiency is improved by the specially designed sodium iodide crystal; realizes automatic measurement of uranium concentration of the solution, has no pollution to the measured solution, and does not generate extra wasteThe material is environment-friendly; the measurement process is carried out in a closed system, and nonradioactive radon gas is released into the air, so that the method is safe and environment-friendly.

Use this detection device, realize the online high concentration uranium analysis of uranium purification process to in measurement process, not add reagent, do not produce waste liquid, the environmental protection. The device is used for monitoring the uranium concentration change of uranium purification process, is convenient for realize unmanned on duty's automatic measure.

Drawings

FIG. 1 is a schematic diagram of an on-line high-concentration uranium analysis detection device for use in a uranium purification process;

FIG. 2 is a schematic diagram of a sodium iodide crystal with through holes to improve gamma detection efficiency in solution;

in the figure: 1. a shielding member; 2. sodium iodide crystals; 3. a photomultiplier tube; 4. a polytetrafluoroethylene pipeline; 5. an electronic circuit; 6. a cable; 7. a solution inlet; 8. a solution outlet; 9. a support frame.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

The detection device consists of a shielding part 1, a sodium iodide crystal 2 with a through hole, a photomultiplier 3 coupled with the sodium iodide crystal, a polytetrafluoroethylene pipeline 4 passing through the through hole of the sodium iodide crystal, an electronic circuit 5 connected with the photomultiplier, a cable 6 connected with an external processing circuit and a power supply circuit, and a support frame 9 processed for stabilizing the detection part of the whole photomultiplier. 7 and 8 in FIG. 1 are the inlet and outlet of the solution to be tested.

Sodium iodide crystal 2 sets up in shielding part 1, the coupling of 2 below of sodium iodide crystal sets up photomultiplier 3, photomultiplier 3 below sets up electronic circuit 5, electronic circuit 5 below sets up cable 6, cable 6 passes shielding part 1, shielding part 1 is last to set up support frame 9, support frame 9 is connected with photomultiplier 3, it has the through-hole to open on the sodium iodide crystal 2, polytetrafluoroethylene pipeline 4 passes this through-hole, polytetrafluoroethylene pipeline 4 both ends are solution entry 7 and solution outlet 8 respectively, solution entry 7 and solution outlet 8 all cross shielding part 1.

The sample introduction pipeline adopts a polytetrafluoroethylene tube, and has the characteristics of high temperature resistance, high acid resistance and the like. In order to obtain higher gamma detection efficiency under the condition of smaller solution sampling, the structure of the sodium iodide crystal is specially designed. The solution to be detected flows through a sodium iodide crystal with a through hole in the middle through a corrosion-resistant polytetrafluoroethylene tube, and the solution is wrapped by the sodium iodide crystal, so that the detection efficiency of the sodium iodide crystal is greatly improved. Therefore, in this case, the amount of uranium solution to be measured needs only 50ml, and the sampling volume is reduced. The specific structure of the sodium iodide crystal is shown in fig. 2.

The polytetrafluoroethylene tube passes through the through-hole shown in FIG. 2 and flows through the tube with dissolved diuranate, U₃O₈Or the extracted saturated organic phase solution, gamma rays emitted by uranium-235 in the solution are detected by sodium iodide crystals, and the content of total uranium is obtained according to the detection result.

The specific working process is as follows:

under the shielding effect of the shielding component, the sodium iodide crystal 2, the photomultiplier 3 and part of the polytetrafluoroethylene pipelines eliminate the influence of natural radionuclides such as uranium, thorium, radium, potassium and the like existing in the external environment and gamma rays generated by a large amount of uranium solution in a working place on the measurement process. After coming out of the sodium iodide crystal, the polytetrafluoroethylene pipeline is not directly led out of the shielding component, but is led out of the shielding component in a reverse mode. See in particular fig. 1. The benefits of this are: firstly, the probability that gamma rays outside the shielding component enter the sodium iodide crystal through the inlet and the outlet of the solution is greatly reduced; secondly, as the pipeline passes through the outside of the sodium iodide crystal, the gamma ray generated by uranium-235 in the solution also irradiates the sodium iodide crystal, and the detection efficiency of sodium iodide is further improved.

When the solution flows through the sodium iodide crystal through the polytetrafluoroethylene pipeline, except the opening direction, the gamma ray generated by uranium-235 in the uranium solution in the through hole can be detected by the sodium iodide crystal in a 4 pi solid angle, so that the detection efficiency of the sodium iodide crystal is very high. In addition, in fig. 1, the polytetrafluoroethylene pipeline passes through the sodium iodide crystal from the outside in a reverse-folding manner, and gamma rays generated by uranium-235 in the solution irradiate the sodium iodide crystal, so that the detection efficiency is further improved. Therefore, in the practical application process, the solution to be detected with a smaller volume can be adopted, the purpose of measurement is achieved, and the volume of the detection device is further reduced. Gamma rays generated by uranium-235 in the solution irradiate the sodium iodide crystal, finally generate exciting light on the sodium iodide crystal, generate an electric signal through the photomultiplier, further transmit the electric signal to the signal processing unit, perform amplitude analysis and discrimination, obtain information required by people, and finally convert the information into uranium concentration.

Because the pipeline is made of polytetrafluoroethylene materials, the materials are high temperature resistant, corrosion resistant and not easy to stain, and can be bent at a small angle, and the solution to be detected flows in the pipeline, so that the pipeline has no dead angle and is easy to clean. Therefore, the material is suitable for the detection device.

The device is used for the online high-concentration uranium analysis of a certain uranium purification research project process in China, and in the measuring process, no reagent is added, no waste liquid is generated, and the device is environment-friendly. The device is used for monitoring the uranium concentration change in the uranium purification process, is convenient for realize unmanned on duty's automatic measure.

This patent provides a high concentration uranium analysis detecting device suitable for uranium purification process and uranium hydrometallurgy process automatic analysis measurement. Through the special design of a sodium iodide crystal structure and a solution sampling pipeline, the detection efficiency of the sodium iodide crystal on the gamma ray of uranium-235 in the solution is improved, the required sampling volume is 50mL, the uranium concentration is measured by measuring the gamma energy peak area of 185keV of uranium-235, no reagent is required to be added, and no waste liquid is generated; the measurement process is carried out in a closed system, no radioactive radon gas is released, and the method is safe and environment-friendly and is convenient for realizing unattended automatic measurement.