Device and method for online monitoring of sulfate in pressurized solution

Abstract

The present invention relates to the field of ion monitoring technology, and specifically discloses a device and method for online monitoring of sulfate in a pressurized solution. Laser light emitted by a laser is expanded by a laser beam expander, passes through a collimating lens, and strikes a dichroic mirror at a 45° angle. The laser then reflects into a coupler, is then transmitted through an optical fiber connected to the coupler, and is injected into a flow cell from an optical fiber interface. Raman light generated by the detection solution in the flow cell after being irradiated by the laser is collected by the optical fiber, transmitted to the coupler, and transmitted through the dichroic mirror. The light is then filtered and collimated, focused by a focusing lens and a lens, and then enters a spectrometer for spectral band separation, and finally detected by a CCD. The present invention eliminates the need for manual sample removal and measurement, and can achieve in-situ, pressurized testing of sulfate ions in a solution.

Description

Technical Field

[0001] The invention belongs to the technical field of ion monitoring, and particularly relates to a device and method for online monitoring of sulfate radicals in a pressurized solution. Background Art

[0002] CO2+O2 in-situ uranium leaching is a new, green and environmentally friendly uranium mining process, a key uranium mining and metallurgy technology being developed in my country. The process involves dissolving O2 and CO2 in a leaching agent and injecting it underground. The dissolved oxygen oxidizes low-valent uranium in the sandstone into hexavalent uranium, which then reacts with bicarbonate in the solution to form uranyl carbonate complex ions, transferring the uranium minerals from the solid phase to the liquid phase, thereby achieving leaching.

[0003] Anions in the CO2+O2 in situ leaching solution, such as bicarbonate, carbonate, and sulfate, are key parameters affecting the efficiency of uranium mining. Sulfate content indicates the degree of blockage in underground deposits and is a crucial metric in the uranium mining process. Existing analytical testing methods collect samples offline and send them to the laboratory for manual titration or ion chromatography. These laboratory titration or instrumental testing methods cannot provide timely information on sulfate concentrations within pressurized process vessels or pipelines, failing to meet the on-site measurement requirements of modern uranium mining processes, which would allow for timely adjustment of process parameters and prevent major incidents.

[0004] Therefore, it is urgent to accurately control the existing in-situ leaching process parameters, realize digital uranium mines and intelligent uranium mines, improve uranium mining and smelting efficiency, and provide more real and accurate data for the establishment and improvement and optimization of in-situ leaching process models. Therefore, it is very necessary to develop in-situ online monitoring technology for sulfate ion concentration in CO2+O2 in-situ leaching uranium mining process solutions. Summary of the Invention

[0005] The object of the present invention is to provide an apparatus and method for online monitoring of sulfate in pressurized solution to meet the needs of CO2+O2 in-situ leaching uranium mining process.

[0006] The technical solutions of the present invention are as follows:

[0007] An online monitoring device for sulfate in a pressurized solution, comprising an online Raman spectroscopy detection system, a liquid control system, an automatic control system, and a data acquisition-processing system;

[0008] The online Raman spectroscopy detection system includes a laser, a laser beam expander, a collimating lens, a coupler, an optical fiber, an optical fiber interface, a dichroic mirror, a spectrometer and a CCD;

[0009] The laser light emitted by the laser is expanded by a laser beam expander, passes through a collimating lens at a 45° angle, hits a dichroic mirror, is reflected into a coupler, and then is transmitted through an optical fiber connected to the coupler and injected into the flow cell from the optical fiber interface.

[0010] The Raman light generated by the detection solution in the flow cell after being irradiated by the laser is collected by the optical fiber, transmitted to the coupler, and transmitted through the dichroic mirror. It is then filtered and collimated, focused by the focusing lens and the lens, and then enters the spectrometer for spectral band separation, and finally detected by the CCD.

[0011] The liquid control system includes a pressurized pipeline, an inlet three-way solenoid valve, a circulation pool, an outlet three-way solenoid valve, a solution reflux pressure pump, a sulfate calibration solution bottle, a waste liquid bottle, and a calibration liquid pump;

[0012] The inlet three-way solenoid valve is connected to the liquid outlet of the pressurized pipeline, the liquid inlet of the circulation pool and the sulfate calibration solution bottle through pipelines, and the outlet three-way solenoid valve is connected to the liquid inlet of the pressurized pipeline, the liquid outlet of the circulation pool and the waste liquid bottle through pipelines;

[0013] A calibration solution pump is provided on the pipeline between the inlet three-way solenoid valve and the sulfate calibration solution bottle;

[0014] A solution reflux pressure pump is provided on the pipeline between the outlet three-way solenoid valve and the liquid inlet end of the pressurized pipeline;

[0015] The flow cell is used to hold the test solution or calibration solution, and the device is placed in measurement, calibration or reflux mode by adjusting the inlet three-way solenoid valve and the outlet three-way solenoid valve;

[0016] The automatic control system and data acquisition-processing system include a computer and a data acquisition control card;

[0017] The data acquisition control card is connected to the spectrometer and CCD to collect detection parameters and feed them back to the computer; at the same time, the data acquisition control card is also connected to the inlet three-way solenoid valve, the outlet three-way solenoid valve, the solution reflux pressure pump, and the calibration liquid pump to control the opening and closing states of the valves and pumps.

[0018] The optical fiber is a bidirectional optical fiber, which transmits the Raman scattered light of the measured solution while transmitting the laser.

[0019] The optical fiber is a single bidirectional optical fiber or an integration of multiple optical fibers.

[0020] An online filter is provided on the pipeline between the liquid outlet end of the pressurized pipeline and the inlet three-way electromagnetic valve, for filtering out solid particles in the detection solution.

[0021] The Raman light generated by the detection solution in the flow cell after being irradiated by the laser is transmitted through the dichroic mirror, then passes through the high-pass filter, collimating lens, micro-transmission hole, and is focused by the focusing lens and lens before entering the spectrometer.

[0022] The laser outputs laser light of 785 nm, 632.8 nm, 532 nm, 488 nm, 473 nm, 457 nm, 355 nm, 325 nm, 266 nm or 244 nm.

[0023] In the calibration mode, the inlet solenoid valve is connected to the sulfate calibration solution bottle and the circulation cell, and the outlet three-way solenoid valve is connected to the circulation cell and the waste liquid bottle;

[0024] In the measurement mode, the inlet solenoid valve is connected to the liquid outlet end of the pressurized pipeline and the circulation pool, and the outlet three-way solenoid valve is connected to the circulation pool and the waste liquid bottle;

[0025] In the reflux mode, the outlet three-way solenoid valve is connected to the circulation pool and the liquid inlet end of the pressurized pipeline.

[0026] A method for online monitoring of sulfate in a pressurized solution, using the device for monitoring, comprises the following steps:

[0027] Step 1: Calibration

[0028] Connect the sulfate calibration solution bottle and the circulation cell through the inlet solenoid valve, connect the circulation cell and the waste liquid bottle through the outlet three-way solenoid valve, turn on the calibration liquid pump to replace the original liquid in the circulation cell with the calibration solution in the sulfate calibration solution bottle, then switch the outlet three-way solenoid valve from the waste liquid bottle pipeline to the pressurized pipeline inlet end pipeline, turn off the solution reflux pressure pump, and increase the pressure of the calibration liquid pump to ensure that the pressure of the calibration solution in the circulation cell is consistent with that of the test solution in the pressurized pipeline;

[0029] Measure the Raman spectrum of the calibration solution in the flow cell at this time, and record the Raman shift and intensity of sulfate ions in the calibration mode;

[0030] Step 2: Detection Solution Measurement

[0031] Connect the outlet end of the pressurized pipeline with the circulation cell through the inlet solenoid valve, and connect the circulation cell with the waste liquid bottle through the outlet three-way solenoid valve, so that the test solution in the pressurized pipeline replaces the calibration liquid in the circulation cell. Then switch the outlet three-way solenoid valve from the waste liquid bottle pipeline to the liquid inlet end of the pressurized pipeline, turn off the solution reflux pressure pump, and make the pressure of the test solution in the circulation cell consistent with that of the test solution in the pressurized pipeline.

[0032] The Raman spectrum of the detection solution in the flow cell at this time was measured, and the Raman shift and intensity of the sulfate ion in the measurement mode were recorded.

[0033] The method further includes step 3: detecting solution reflux;

[0034] The flow cell and the liquid inlet end of the pressurized pipeline are connected through the outlet three-way solenoid valve, and the reflux pressure pump is turned on to recover the sample solution in the flow cell into the pressurized pipeline for continued use, thereby realizing online non-destructive testing.

[0035] In step 2, a single-point calibration is performed using a computer according to the strength of the calibration solution to obtain the concentration information of sulfate ions in the pressurized solution.

[0036] The remarkable effects of the present invention are:

[0037] (1) The present invention adopts the principle of Raman spectroscopy detection, which eliminates the need to manually remove samples for measurement and can achieve in-situ, pressure-sensitive testing of sulfate ions in the solution.

[0038] (2) The present invention uses a calibration liquid pump under a closed pipeline to make the pressure of the calibration solution consistent with that in the pipeline. The detection environment of the calibration solution is the same as that of the pressurized pipeline, which is conducive to obtaining more accurate data.

[0039] (3) The present invention adopts optical fiber transmission mode, which facilitates the combination of online Raman spectroscopy and pressurized pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of the device for online monitoring of sulfate in pressurized solution;

[0041] Figure 2 Schematic diagram of the optical fiber interface.

[0042] In the figure: 101. Laser; 102. Laser beam expander; 103. Collimating lens; 104. Coupler; 105. Optical fiber; 106. Optical fiber interface; 201. Dichroic mirror; 202. High-pass filter; 203. Collimating lens; 204. Micro-transmission aperture; 205. Focusing lens; 206. Lens; 207. Spectrometer; 208. CCD; 301. Pressurized pipeline; 302. Inlet three-way solenoid valve; 303. Circulation cell; 304. Outlet three-way solenoid valve; 305. Solution reflux pressure pump; 306. Sulfate calibration solution bottle; 307. Waste liquid bottle; 308. Online filter; 309. Calibration solution pump; 401. Computer; 402. Data acquisition control card. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] like Figure 1 The device shown is an online monitoring device for sulfate radicals in a pressurized solution, comprising an online Raman spectrum detection system, a liquid control system, an automatic control system and a data acquisition-processing system.

[0045] The online Raman spectroscopy detection system includes a laser 101, a laser beam expander 102, a collimating lens 103, a coupler 104, an optical fiber 105, an optical fiber interface 106, a dichroic mirror 201, a high-pass filter 202, a collimating lens 203, a micro-transmission hole 204, a focusing lens 205, a lens 206, a spectrometer 207 and a CCD 208.

[0046] The laser light emitted by the laser 101 is expanded by the laser beam expander 102, passes through the collimating lens 103, hits the dichroic mirror 201 at a 45° angle, and is reflected into the coupler 104. The laser light is then transmitted through the optical fiber 105 connected to the coupler 104 and injected into the flow cell 303 through the optical fiber interface 106. The Raman light generated by the detection solution in the flow cell 303 after being irradiated by the laser is collected by the optical fiber 105, transmitted to the coupler 104, and transmitted through the dichroic mirror 201. The Raman light then passes through the high-pass filter 202, the collimating lens 203, and the micro-transmission hole 204 in sequence. After being focused by the focusing lens 205 and the lens 206, the Raman light enters the spectrometer 207 for spectral band separation, and is finally detected by the CCD 208.

[0047] The laser 101 can output laser light of 785 nm, 632.8 nm, 532 nm, 488 nm, 473 nm, 457 nm, 355 nm, 325 nm, 266 nm or 244 nm.

[0048] The optical fiber 105 is a bidirectional optical fiber, which can be a single bidirectional optical fiber or an integration of multiple optical fibers, and transmits the Raman scattered light of the solution being measured while transmitting the laser.

[0049] The liquid control system includes a pressurized pipeline 301, an inlet three-way solenoid valve 302, a circulation pool 303, an outlet three-way solenoid valve 304, a solution reflux pressure pump 305, a sulfate calibration solution bottle 306, a waste liquid bottle 307, an online filter 308, and a calibration liquid pump 309.

[0050] The inlet three-way solenoid valve 302 is connected via pipes to the outlet of the pressurized pipe 301, the inlet of the circulation cell 303, and a sulfate calibration solution bottle 306. The outlet three-way solenoid valve 304 is connected via pipes to the inlet of the pressurized pipe 301, the outlet of the circulation cell 303, and a waste liquid bottle 307. An inline filter 308 is provided in the pipe between the outlet of the pressurized pipe 301 and the inlet three-way solenoid valve 302 to filter out solid particles in the test solution.

[0051] A calibration solution pump 309 is provided on the pipeline between the inlet three-way solenoid valve 302 and the sulfate calibration solution bottle 306. A solution reflux pressure pump 305 is provided on the pipeline between the outlet three-way solenoid valve 304 and the liquid inlet end of the pressurized pipeline 301.

[0052] The circulation pool 303 is used to contain the detection solution or the calibration solution. By adjusting the inlet three-way solenoid valve 302 and the outlet three-way solenoid valve 304, the device is placed in the measurement mode, the calibration mode or the reflux mode.

[0053] The automatic control system and data acquisition and processing system include a computer 401 and a data acquisition control card 402. The data acquisition control card 402 is connected to the spectrometer 207 and CCD 208 to collect detection parameters and feed them back to the computer 401. The data acquisition control card 402 is also connected to the inlet three-way solenoid valve 302, the outlet three-way solenoid valve 304, the solution reflux pressure pump 305, and the calibration liquid pump 309 to control the opening and closing states of the valves and pumps.

[0054] A method for online monitoring of sulfate in a pressurized solution comprises the following steps:

[0055] Step 1: Calibration

[0056] The sulfate calibration solution bottle 306 and the circulation cell 303 are connected through the inlet three-way solenoid valve 302, and the circulation cell 303 and the waste liquid bottle 307 are connected through the outlet three-way solenoid valve 304. The calibration liquid pump 309 is turned on to replace the original liquid in the circulation cell 303 with the calibration solution in the sulfate calibration solution bottle 306. Then, the outlet three-way solenoid valve 304 is switched from the waste liquid bottle 307 pipeline to the liquid inlet end pipeline of the pressurized pipeline 301. The solution reflux pressure pump 305 is closed to increase the pressure of the calibration liquid pump 309 to ensure that the pressure of the calibration solution in the circulation cell 303 is consistent with that of the test solution in the pressurized pipeline 301.

[0057] The Raman spectrum of the calibration solution in the flow cell 303 is measured, and the Raman shift and intensity of sulfate ions in the calibration mode are recorded.

[0058] Step 2: Detection Solution Measurement

[0059] The liquid outlet of the pressurized pipeline 301 is connected to the circulation cell 303 through the inlet three-way solenoid valve 302, and the circulation cell 303 is connected to the waste liquid bottle 307 through the outlet three-way solenoid valve 304, so that the detection solution in the pressurized pipeline 301 replaces the calibration liquid in the circulation cell 303. Then, the outlet three-way solenoid valve 304 is switched from the waste liquid bottle 307 pipeline to the liquid inlet pipeline of the pressurized pipeline 301, and the solution reflux pressure pump 305 is closed to make the pressure of the detection solution in the circulation cell 303 and the detection solution in the pressurized pipeline 301 consistent;

[0060] Measure the Raman spectrum of the detection solution in the flow cell 303 at this time, and record the Raman shift and intensity of sulfate ions in the measurement mode;

[0061] According to the strength of the calibration solution, a single-point calibration is performed using computer 401 to obtain concentration information of sulfate ions in the pressurized solution;

[0062] Step 3: Detect solution reflux

[0063] The flow cell 303 and the liquid inlet end of the pressurized pipeline 301 are connected through the outlet three-way solenoid valve 304, and the reflux pressure pump 305 is turned on to recover the sample solution in the flow cell 303 into the pressurized pipeline 301 for continued use to achieve online non-destructive testing.

[0064] Example

[0065] An online monitoring device for sulfate radicals in pressurized solution, the overall structure of which is the same as described above, wherein the optical fiber 105 is centered around one excitation optical fiber and surrounded by 12 optical fibers for collecting Raman spectra, such as Figure 2 shown.

[0066] A method for online monitoring of sulfate in pressurized solutions employs an external standard method for sulfate ion measurement, using a calibration solution for single-point external standard quantification. The measurement steps are as follows:

[0067] The light source of the laser 101 is 532 nm, the power is 100 mW, and the spectrometer scanning mode is Raman wave number scanning, with a range of 500-4000 cm -1 , the CCD integration time is 120s, the Raman shift of sulfate is measured to be 980cm-1, and the pressure of the pressurized pipeline is 0.4MPa.

[0068] 1) First, measure the Raman intensity of sulfate ions in a pressurized calibration solution containing 2000 mg / L sulfate. Connect the inlet solenoid valve to the calibration solution pump and the flow cell, and the outlet three-way solenoid valve to the flow cell and the waste liquid bottle. Maintain this position for 10 seconds to allow the calibration solution to replace the original liquid in the flow cell. Then, switch the outlet three-way solenoid valve to the solution reflux pressure pump, shut off the reflux pressure pump, and increase the pressure of the calibration solution pump to equalize the pressure in the flow cell and the pressurized pipeline.

[0069] The Raman spectrum of the calibration solution was measured at this time, and the Raman shift and intensity of sulfate ions were recorded.

[0070] 2) Next, measure the Raman intensity of sulfate ions in the test solution. Connect the inlet solenoid valve to the pressurized pipeline and the flow cell, and the outlet three-way solenoid valve to the flow cell and the waste liquid bottle. Maintain this state for 10 seconds, allowing the pressurized pipeline solution to replace the original liquid in the flow cell. Then, switch the outlet three-way solenoid valve to the solution reflux pressure pump, shutting off the reflux pressure pump to equalize the solution in the flow cell with that in the pressurized pipeline.

[0071] Measure the Raman spectrum of the solution at this time and record the Raman shift and intensity of sulfate ions;

[0072] The computer performs single-point calibration based on the strength of the calibration solution to obtain the concentration information of sulfate ions in the pressurized solution.

[0073] 3) Finally, in the sample reflux mode, the outlet three-way solenoid valve is connected to the solution reflux pressure pump direction, and the reflux pressure pump pumps the sample solution in the circulation pool into the pressurized pipeline.

Claims

1. A device for online monitoring of sulfate in a pressurized solution, characterized in that: Including online Raman spectroscopy detection system, liquid control system, automatic control system and data acquisition-processing system; The online Raman spectrum detection system comprises a laser (101), a laser beam expander (102), a collimating lens (103), a coupler (104), an optical fiber (105), an optical fiber interface (106), a dichroic mirror (201), a spectrometer (207) and a CCD (208); The laser light emitted by the laser (101) is expanded by the laser beam expander (102), passes through the collimating lens (103), hits the dichroic mirror (201) at a 45° angle, is reflected into the coupler (104), and then is transmitted through the optical fiber (105) connected to the coupler (104), and is injected into the flow cell (303) from the optical fiber interface (106); The Raman light generated by the detection solution in the circulation pool (303) after being irradiated by the laser is collected by the optical fiber (105), transmitted to the coupler (104), transmitted through the dichroic mirror (201), filtered and collimated, focused by the focusing lens (205) and the lens (206), and then enters the spectrometer (207) for spectral band separation, and finally detected by the CCD (208); The liquid control system comprises a pressurized pipeline (301), an inlet three-way solenoid valve (302), a circulation pool (303), an outlet three-way solenoid valve (304), a solution reflux pressure pump (305), a sulfate calibration solution bottle (306), a waste liquid bottle (307), and a calibration liquid pump (309); The inlet three-way solenoid valve (302) is connected to the liquid outlet of the pressurized pipeline (301), the liquid inlet of the circulation pool (303), and the sulfate calibration solution bottle (306) through pipelines, and the outlet three-way solenoid valve (304) is connected to the liquid inlet of the pressurized pipeline (301), the liquid outlet of the circulation pool (303), and the waste liquid bottle (307) through pipelines. A calibration solution pump (309) is provided on the pipeline between the inlet three-way solenoid valve (302) and the sulfate calibration solution bottle (306); A solution reflux pressure pump (305) is provided on the pipeline between the outlet three-way solenoid valve (304) and the liquid inlet end of the pressurized pipeline (301); The circulation pool (303) is used to contain a detection solution or a calibration solution, and the device is placed in a measurement mode, a calibration mode, or a reflux mode by adjusting the inlet three-way solenoid valve (302) and the outlet three-way solenoid valve (304); The automatic control system and data acquisition-processing system include a computer (401) and a data acquisition control card (402); The data acquisition control card (402) is connected to the spectrometer (207) and the CCD (208) to collect detection parameters and feed them back to the computer (401); at the same time, the data acquisition control card (402) is also connected to the inlet three-way solenoid valve (302), the outlet three-way solenoid valve (304), the solution reflux pressure pump (305), and the calibration liquid pump (309) to control the opening and closing states of the valves and pumps.

2. The device for online monitoring of sulfate radicals in a pressurized solution according to claim 1, wherein: The optical fiber (105) is a bidirectional optical fiber, which transmits the Raman scattered light of the solution being tested while transmitting the laser.

3. The device for online monitoring of sulfate radicals in a pressurized solution according to claim 2, wherein: The optical fiber (105) is a single bidirectional optical fiber or an integration of multiple optical fibers.

4. The device for online monitoring of sulfate radicals in a pressurized solution according to claim 1, wherein: An online filter (308) is provided on the pipeline between the liquid outlet end of the pressurized pipeline (301) and the inlet three-way electromagnetic valve (302) for filtering out solid particles in the detection solution.

5. The device for online monitoring of sulfate radicals in a pressurized solution according to claim 1, wherein: The Raman light generated by the detection solution in the circulation pool (303) after being irradiated by the laser is transmitted through the dichroic mirror (201), then passes through the high-pass filter (202), the collimating lens (203), the micro-transmission hole (204), and is focused by the focusing lens (205) and the lens (206) before entering the spectrometer (207).

6. The device for online monitoring of sulfate radicals in a pressurized solution according to claim 1, wherein: The laser (101) outputs laser light of 785 nm, 632.8 nm, 532 nm, 488 nm, 473 nm, 457 nm, 355 nm, 325 nm, 266 nm or 244 nm.

7. The device for online monitoring of sulfate radicals in a pressurized solution according to claim 1, wherein: In the calibration mode, the inlet three-way solenoid valve (302) is connected to the sulfate calibration solution bottle (306) and the circulation pool (303), and the outlet three-way solenoid valve (304) is connected to the circulation pool (303) and the waste liquid bottle (307); In the measurement mode, the inlet three-way solenoid valve (302) is connected to the liquid outlet of the pressurized pipeline (301) and the circulation pool (303), and the outlet three-way solenoid valve (304) is connected to the circulation pool (303) and the waste liquid bottle (307); In the reflux mode, the outlet three-way solenoid valve (304) is connected to the circulation pool (303) and the liquid inlet end of the pressurized pipeline (301).

8. A method for online monitoring of sulfate in a pressurized solution, using the device according to claim 1 for monitoring, characterized in that: The following steps are involved: Step 1: Calibration The sulfate calibration solution bottle (306) and the circulation cell (303) are connected through the inlet solenoid valve (302), and the circulation cell (303) and the waste liquid bottle (307) are connected through the outlet three-way solenoid valve (304). The calibration liquid pump (309) is turned on to replace the original liquid in the circulation cell (303) with the calibration solution in the sulfate calibration solution bottle (306). Then, the outlet three-way solenoid valve (304) is switched from the waste liquid bottle (307) pipeline to the liquid inlet end pipeline of the pressurized pipeline (301). The solution reflux pressure pump (305) is turned off to increase the pressure of the calibration liquid pump (309) to ensure that the pressure of the calibration solution in the circulation cell (303) is consistent with that of the detection solution in the pressurized pipeline (301); Measuring the Raman spectrum of the calibration solution in the circulation cell (303) at this time, and recording the Raman shift and intensity of sulfate ions in the calibration mode; Step 2: Detection Solution Measurement The liquid outlet of the pressurized pipeline (301) and the circulation pool (303) are connected through the inlet solenoid valve (302), and the circulation pool (303) and the waste liquid bottle (307) are connected through the outlet three-way solenoid valve (304), so that the detection solution in the pressurized pipeline (301) replaces the calibration liquid in the circulation pool (303), and then the outlet three-way solenoid valve (304) is switched from the waste liquid bottle (307) pipeline to the liquid inlet pipeline of the pressurized pipeline (301), and the solution reflux pressure pump (305) is closed, so that the pressure of the detection solution in the circulation pool (303) and the detection solution in the pressurized pipeline (301) are consistent; The Raman spectrum of the detection solution in the circulation cell (303) is measured at this time, and the Raman shift and intensity of the sulfate ion in the measurement mode are recorded.

9. The method for online monitoring of sulfate in a pressurized solution according to claim 8, wherein: The method further includes step 3: detecting solution reflux; The circulation pool (303) and the liquid inlet end of the pressurized pipeline (301) are connected through the outlet three-way solenoid valve (304), and the reflux pressure pump (305) is turned on to recover the sample solution in the circulation pool (303) into the pressurized pipeline (301) for continued use, thereby realizing online non-destructive testing.

10. The method for online monitoring of sulfate in a pressurized solution according to claim 8, wherein: In step 2, a single-point calibration is performed using a computer (401) according to the strength of the calibration solution to obtain concentration information of sulfate ions in the pressurized solution.

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