Automatic enrichment device for co-precipitation of strontium from seawater

Abstract

This application relates to an automated enrichment device for Strontium 90 coprecipitation in seawater, specifically a pretreatment device for seawater testing. The device includes a suction module, a mixing module, a material addition module, and a filtration module. The suction module is used to input seawater samples into the mixing module and to output the seawater suspension after passing through the filtration module. The mixing module is used to mix the seawater samples. The material addition module is used to add solid and liquid reagents to the mixing module. The filtration module includes a vacuum pump and a filtration assembly. The vacuum pump is used to input the seawater suspension formed by the coprecipitation reaction into the filtration assembly, which is used to filter and collect the seawater suspension. This application can process multiple seawater samples in batches, completing the entire process including quantitative water intake, pH adjustment, reagent addition, stirring and heating, coprecipitation reaction, vacuum filtration and collection, tank cleaning, and pipeline evacuation, significantly improving the enrichment efficiency and experimental repeatability of Strontium 90.

Description

Technical Field

[0001] This application relates to the field of seawater pretreatment devices, and in particular to an automatic enrichment device for co-precipitation of Strontium 90 in seawater. Background Technology

[0002] Strontium-90 ( 90 Sr (Sr) is a long-half-life artificial radionuclide produced by nuclear fission, primarily originating from emissions from nuclear facilities, nuclear accident leaks, and atmospheric nuclear test deposition. It is widely present in the marine environment. This radionuclide exhibits strong mobility and bioaccumulation, and its properties are similar to calcium. It can accumulate in human bones through the marine food chain, causing continuous internal radiation damage. It is a core indicator for marine radioactivity monitoring, pollution source tracing, and ecological risk assessment. With the development of coastal nuclear power and the upgrading of marine ecological management in my country, seawater... 90 Precise detection of Sr has become an important technological foundation for the prevention and control of marine nuclear environmental safety.

[0003] Seawater matrix has a complex composition, rich in macro-ions such as sodium, magnesium, and calcium, as well as various interfering nuclides, which can seriously affect... 90 Sr detection accuracy; simultaneously in seawater 90 The background concentration of Sr is extremely low, and conventional detection methods are not sensitive enough and have large errors, which cannot meet the requirements for accurate trace analysis. Pre-treatment such as separation, enrichment, purification and impurity removal is necessary to achieve accurate quantitative detection.

[0004] Current seawater 90 Sr pretreatment mainly includes techniques such as coprecipitation, ion exchange, and extraction chromatography. Among these, coprecipitation is suitable for large-volume water samples, has high enrichment efficiency, and good stability, making it a preferred method for seawater pretreatment. 90 The mainstream pretreatment method for Sr detection. However, existing processes are mostly manual, with steps such as water sample transportation, reagent addition, reaction precipitation, and solid-liquid separation relying on manual intervention. This results in problems such as complex processes, large human errors, and poor experimental repeatability.

[0005] Manual processing is inefficient and lacks batch consistency, making it difficult to meet the needs of large-scale sample testing, routine marine monitoring, and emergency detection of sudden nuclear pollution. It can easily lead to deviations in monitoring data and restrict the development of marine radioactive monitoring and scientific research.

[0006] To address the shortcomings of existing technologies, such as low automation, poor stability, and insufficient efficiency, it is necessary to develop a seawater... 90 The Sr coprecipitation automated enrichment device achieves standardized and automated operation of the entire sample pretreatment process, effectively avoiding human error and improving enrichment efficiency and data repeatability. It has important application value for improving the marine radioactive monitoring technology system and enhancing the ability to prevent and control marine nuclear pollution and assess ecological risks. Summary of the Invention

[0007] In view of the above problems, this application is made in order to provide an automatic enrichment device for seawater strontium 90 co-precipitation that overcomes or at least partially solves the above problems.

[0008] The automatic enrichment device for seawater Strontium 90 co-precipitation provided in this application adopts the following technical solution: The automatic enrichment device for Strontium 90 co-precipitation in seawater includes a suction module, a mixing module, a material addition module, and a filtration module; The suction module is connected to the stirring and mixing module and the filtration module, and is used to input seawater samples into the stirring and mixing module and output the seawater suspension formed by co-precipitation treatment after passing through the filtration module; The stirring and mixing module includes a co-precipitation tank and a stirring assembly; the co-precipitation tank is used to hold seawater samples, and the stirring assembly is used to perform stirring after solid and liquid reagents have been processed. The material addition module includes a solid sample addition component and a liquid sample addition component; the solid sample addition component is used to add solid reagents to the co-precipitation tank, and the liquid sample addition component is used to add liquid reagents to the co-precipitation tank; The filtration module includes a vacuum pump and a filtration assembly; the vacuum pump is used to input the seawater suspension formed by the co-precipitation reaction into the filtration assembly, and the filtration assembly is used to filter and collect the seawater suspension.

[0009] Optionally, the suction module includes an input pipe, a suction pump, and an output pipe connected in sequence. The input pipeline includes multiple input pipes that are interconnected at their ends, and each input pipe is sequentially connected to a filter and a solenoid valve; The input pipeline and the water pump are connected through a first three-way valve, and the remaining port of the first three-way valve is connected to the filter module. The output pipeline and the suction pump are connected through a second three-way valve, and the remaining port of the second three-way valve is connected to the co-precipitation tank.

[0010] Optionally, the solid sample loading assembly includes a rotating support, a turntable, and a tilting mechanism; The rotating support is positioned above the coprecipitation tank, and the top of the coprecipitation tank is provided with a solid reagent addition port; The turntable is vertically mounted on the rotating bracket and rotatably connected to it, and the rotating bracket is equipped with a rotary motor for driving the turntable to rotate in the vertical direction; The turntable has multiple cup holders for holding solid reagent cups evenly arranged circumferentially on one side edge away from the rotating support. The cup holders are rotatably connected to the turntable, and the rotation axis extends to one side of the rotating support. The flipping component is horizontally disposed on the rotating bracket and rotatably connected thereto, and a flipping motor for driving the flipping component to rotate in the horizontal direction is disposed thereon. The flipping component has a notch at one end away from the rotating bracket, and the cup holder rotation shaft extends to one end of the rotating bracket and has an insert that matches the notch. The notch is for the insert to be inserted. When the insert on the rotating shaft of the cup holder at the bottom of the turntable is inserted into the notch during the rotation of the turntable, the flipping motor drives the flipping component to rotate, which in turn drives the cup holder to flip, thereby causing the solid reagent cup to flip.

[0011] Optionally, the liquid dispensing assembly includes a rotating frame, a dispensing base, multiple dispensing pumps, and multiple liquid reagent bottles; The rotating frame is disposed above the co-precipitation tank, the liquid addition base is rotatably connected to the rotating frame, and the rotating component is provided with a rotating servo motor for driving the liquid addition base to rotate horizontally; The liquid filling base is uniformly provided with a plurality of liquid filling tubes equipped with liquid level sensors along its circumferential direction. The plurality of liquid filling tubes are respectively connected to a plurality of liquid filling pumps, and the plurality of liquid filling pumps are respectively connected to a plurality of liquid reagent bottles. The co-precipitation tank is provided with a liquid inlet and a liquid outlet respectively distributed on both sides of the rotating frame; the liquid inlet is connected to the co-precipitation tank and is used to allow the liquid inlet pipe to perform liquid addition operation when the liquid inlet base is rotated to its top; the liquid outlet is used to allow the liquid inlet pipe to perform liquid discharge operation when the liquid inlet base is rotated to its top.

[0012] Optionally, the stirring assembly includes a retaining ring, a quick-release plate, a stirring paddle, and a timing pulley set; The fixing ring is horizontally positioned at the top opening of the co-precipitation tank, and the quick-release plate is positioned on the fixing ring and movably connected to it; The stirring paddle is vertically positioned inside the co-precipitation tank and is rotatably connected to the quick-release plate. The synchronous pulley assembly includes a driving pulley, a stirring motor, a driven pulley, a belt, and a locking clamp; The stirring motor is connected to the driving pulley and can slide horizontally; the driven pulley is connected to the stirring paddle, and the belt is sleeved on the driving pulley and the driven pulley; The locking clamp is disposed between the driving pulley and the driven pulley and is used to drive the stirring motor and the driving pulley to slide in a direction away from or close to the stirring paddle; When the positions of the stirring motor and the drive pulley are locked, the locking clamp handle is driven to move downward, thereby driving the stirring motor and the drive pulley to move together in a direction away from the stirring paddle and simultaneously tensioning the belt, locking the positions of the stirring motor and the drive pulley and realizing power transmission; When the agitator is disassembled, the locking clamp handle is driven to move upward, which in turn drives the agitator motor and the drive pulley to move together in the direction close to the agitator and simultaneously loosens the belt, at which point the agitator can be disassembled separately.

[0013] Optionally, the stirring paddle is integrated with a heating rod, and the co-precipitation tank is equipped with a temperature sensor.

[0014] Optionally, the filtration assembly includes a filter cartridge, a water collection tank, and multiple filter cups; The filter cylinder has multiple filter compartments inside, which are used to support the filter cup, and the top is sealed by a quick-release sealing handle; The filter cartridge has multiple water inlets on its side that are connected to the filter chamber, and the water inlets are also connected to the drain hole at the bottom of the co-precipitation tank through a pipeline with a solenoid valve. The water collection tank is located below the filter cylinder, and has an inlet and a suction port on the top. The inlet is connected to the bottom of the filter cylinder, and the suction port is connected to the vacuum pump through a pipeline with a solenoid valve. The bottom of the water collection tank is provided with an outlet, which is connected to the first three-way valve through a pipeline with a solenoid valve. The water collection tank is equipped with a liquid level sensor.

[0015] Optionally, a cleaning module may also be included; The cleaning module includes a rotating nozzle, a cleaning water pump, and a cleaning water tank; The rotating nozzle is located at the top of the co-precipitation tank and is connected in sequence to the cleaning water pump and the cleaning water tank.

[0016] Optionally, the co-precipitation tank is equipped with a pH sensor and multiple liquid level sensors; Multiple liquid level sensors are arranged sequentially along the height direction of the co-precipitation tank.

[0017] In summary, this application has the following beneficial technical effects: This application can process multiple seawater samples in batches, and can complete the entire process of quantitative water intake, pH adjustment, reagent addition, stirring and heating, co-precipitation reaction, vacuum filtration collection, tank cleaning, and pipeline evacuation, which significantly improves the enrichment efficiency and experimental repeatability of Strontium 90. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application. Figure 1 ; Figure 2 This is a schematic diagram of the overall structure of an embodiment of this application. Figure 2 ; Figure 3 This is a schematic diagram of the connection relationship between the modules in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of the material adding module and the mixing module in the embodiments of this application. Figure 1 ; Figure 5 This is a schematic diagram of the structure of the material adding module and the mixing module in the embodiments of this application. Figure 2 ; Figure 6 This is a schematic diagram of the solid sample addition assembly in the embodiments of this application; Figure 7 yes Figure 6 A magnified view of a portion of region A in the middle; Figure 8 This is a schematic diagram of the structure of the filter cartridge in an embodiment of this application.

[0019] Figure labeling: 1. Suction module; 11. Input pipeline; 12. Suction pump; 13. Output pipeline; 14. First three-way valve; 15. Second three-way valve; 16. Filter; 2. Mixing module; 21. Sedimentation tank; 22. Mixing assembly; 221. Fixing ring; 222. Quick release plate; 223. Stirring paddle; 224. Synchronous pulley assembly; 2241. Locking clamp; 23. pH sensor; 24. Temperature sensor; 25. Liquid level sensor; 3. Material addition module; 31. Solid sample addition assembly; 311. Rotating support; 312. Turntable; 313. Rotary motor; 3 14. Cup holder; 3141. Insert; 315. Flipping component; 3151. Notch; 316. Flipping motor; 32. Liquid dispensing assembly; 321. Rotating frame; 322. Liquid dispensing base; 323. Rotating servo motor; 324. Liquid dispensing pump; 325. Liquid reagent bottle; 4. Filtration module; 41. Vacuum pump; 42. Filtration assembly; 421. Filter cartridge; 4211. Filter compartment; 422. Water collection tank; 423. Filter cup; 5. Cleaning module; 51. Rotating nozzle; 52. Cleaning water pump; 53. Cleaning water tank; 6. Control unit; 7. Body; 71. Liquid dispensing port; 72. Liquid drain port. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. Obviously, the described embodiments are one embodiment of this invention, and not all embodiments. Based on the described embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0021] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0022] This embodiment provides an automatic enrichment device for co-precipitation of Strontium 90 in seawater.

[0023] Reference Figures 1 to 3 The device is mainly composed of a suction module 1, a mixing module 2, a material adding module 3, a filtration module 4, a cleaning module 5, a control unit 6, and a body 7 that supports the above structures.

[0024] The suction module 1 is used to input seawater samples and to transfer, filter, and discharge seawater suspension after co-precipitation reaction. It is connected to the stirring and mixing module 2 and the filtration module 4.

[0025] The suction module 1 mainly consists of an input pipeline 11, a suction water pump 12, an output pipeline 13, a first three-way valve 14, a second three-way valve 15, and a filter 16.

[0026] The input pipeline 11 includes multiple input pipes that are interconnected at their ends, i.e., multiple input pipes connected in parallel. Each input pipe is equipped with a filter 16 and an independent solenoid valve in sequence, which can realize independent switching and extraction of multiple seawater samples.

[0027] The input pipeline 11 is connected to the suction pump 12 through the first three-way valve 14. The remaining interface of the first three-way valve 14 is connected to the filter module 4 to realize waste liquid discharge and secondary filtration.

[0028] The output pipeline 13 is connected to the suction pump 12 via a second three-way valve 15. The remaining interface of the second three-way valve 15 is connected to the stirring and mixing module 2, which is used to send seawater samples into the co-precipitation reaction area.

[0029] Reference Figures 3 to 5 The stirring and mixing module 2 serves as the core unit for the coprecipitation reaction, used to hold the seawater sample and complete pH adjustment, reagent mixing, heating, and coprecipitation reaction.

[0030] The stirring and mixing module 2 includes a co-precipitation tank 21, a stirring assembly 22, a pH sensor 23, a temperature sensor 24, and multiple liquid level sensors 25.

[0031] The co-precipitation tank 21 is made of acid- and alkali-resistant and radiation-resistant material. It has an inlet for water and a solid reagent addition port at the top, and a drain outlet at the bottom. A pH sensor 23, a temperature sensor 24, and multi-stage non-contact liquid level sensors 25 distributed along the height of the tank are installed on the tank wall to monitor the pH value, temperature, and liquid level of the liquid inside the tank in real time.

[0032] The suction pump 12, together with multiple non-contact liquid level sensors 25 installed on the co-precipitation tank 21, can accurately control the injection of different volumes such as 20L, 30L, and 50L to meet the experimental needs of different sample quantities.

[0033] The mixing assembly 22 includes a fixing ring 221, a quick release plate 222, a mixing paddle 223, and a timing pulley set 224.

[0034] The fixing ring 221 is horizontally installed at the top opening of the co-sedimentation tank 21, and the quick-release plate 222 is movably connected above the fixing ring 221. In specific implementation, it is preferable to uniformly arrange multiple L-shaped grooves along the circumference of the fixing ring 221, and the L-shaped grooves are horizontally arranged; the edge end face of the quick-release plate 222 is uniformly arranged with multiple sliding strips that are adapted to the L-shaped grooves along its circumference, and the sliding strips can be vertically embedded into the L-shaped grooves and then rotated and slid horizontally.

[0035] The stirring paddle 223 is vertically installed inside the co-precipitation tank 21 and is rotatably connected to the quick-release plate 222. The stirring paddle 223 integrates a heating rod, which can heat the liquid while stirring.

[0036] The synchronous pulley assembly 224 consists of a driving pulley, a stirring motor, a driven pulley, a belt, and a locking clamp 2241.

[0037] The stirring motor is connected to the driving pulley and can slide horizontally along the machine body 7. The driven pulley is connected to the stirring paddle 223. The belt is sleeved on the driving pulley and the driven pulley.

[0038] The locking clamp 2241 is located between the driving pulley and the driven pulley and is used to drive the stirring motor and the driving pulley to slide in a direction away from or towards the stirring paddle 223.

[0039] The locking clamp 2241 drives the stirring motor and the drive pulley to move via the handle. When the handle moves downward, the stirring motor moves away from the stirring paddle 223, and the belt is tightened while locking the position of the stirring motor and the drive pulley to achieve power transmission. When the handle moves upward, the motor moves closer to the stirring paddle 223, and the belt loosens. At this time, the quick-release plate 222 and the stirring paddle 223 can be removed as a whole to complete quick disassembly and cleaning, avoiding cross-contamination between samples.

[0040] In the specific implementation process, in order to prevent the locking clamp 2241 from being automatically unlocked due to vibrations or other factors during the operation of the device, additional fixing screws or other auxiliary locking components can be set to lock the position of the stirring motor.

[0041] Reference Figures 3 to 7 The material addition module 3 is used to automatically and accurately add solid and liquid reagents to the mixing module 2, specifically including a solid sample addition component 31 and a liquid sample addition component 32.

[0042] The solid sample feeding assembly 31 includes a rotating support 311, a turntable 312, a rotating motor 313, a cup holder 314, a flipping component 315, and a flipping motor 316.

[0043] The rotating bracket 311 is fixedly installed above the co-precipitation tank 21, and the turntable 312 is vertically set on the rotating bracket 311 and driven to rotate at a fixed angle in the vertical direction by the rotating motor 313 in conjunction with the pulley assembly.

[0044] Multiple cup holders 314 are provided, and the multiple cup holders 314 are located on the side edge of the turntable 312 opposite to the rotating support 311 and are evenly arranged along its circumference, and are used to hold solid reagent cups. The cup holders 314 are rotatably connected to the turntable 312, and their rotation axis extends to one side of the rotating support 311 and is provided with an insert 3141.

[0045] The flipping component 315 is horizontally mounted on the rotating bracket 311 and driven to rotate in the horizontal direction by the flipping motor 316, and a notch 3151 matching the insert 3141 is provided at the end away from the rotating bracket 311.

[0046] When the turntable 312 rotates and the target cup holder 314 reaches the lowest position, the insert 3141 is inserted into the notch 3151, the flipping motor 316 drives the flipping part 315 to rotate, causing the cup holder 314 and the fixed reagent cup to flip, and the solid reagent falls into the co-precipitation tank 21 through the solid reagent addition port. After the addition of the fixative reagent is completed, the turntable 312 continues to rotate, the insert 3141 separates from the notch 3151, and the cup holder 314 automatically resets under the action of gravity, keeping the opening facing upward.

[0047] Reference Figures 3 to 5 The liquid dispensing assembly 32 includes a rotating frame 321, a dispensing base 322, a rotating servo motor 323, multiple dispensing pumps 324, and multiple liquid reagent bottles 325.

[0048] The rotating frame 321 is installed above the co-precipitation tank 21, and the liquid addition base 322 is rotatably connected to the rotating frame 321 and driven by the rotating servo motor 323 to rotate in the horizontal direction.

[0049] Multiple liquid filling tubes are equipped with liquid level sensors 25, which are evenly distributed around the liquid filling base 322 and are connected to multiple liquid filling pumps 324 respectively. The multiple liquid filling pumps 324 are then connected to multiple corresponding liquid reagent bottles 325.

[0050] The co-precipitation tank 21 is equipped with a liquid inlet 71 and a liquid outlet 72, respectively located on both sides of the rotating base. The liquid inlet 71 is connected to the co-precipitation tank 21, and the liquid outlet 72 is connected to the output pipeline 13. The liquid inlet base 322 can switch between the liquid inlet 71 and the liquid outlet 72 under the drive of the rotary servo motor 323. When adding liquid, the reagent is fed into the tank by aligning with the liquid inlet 71, and when emptying, the air in the pipeline is discharged by aligning with the liquid outlet 72, ensuring the accuracy and stability of liquid addition.

[0051] In the specific implementation process, the liquid dispensing pump 324 adopts a combination of a syringe pump and a peristaltic pump. The syringe pump is responsible for dispensing micro-volume, high-precision reagents. After dispensing, it can switch to clean water through its own three-way valve to automatically flush the pipeline and pump body; the peristaltic pump is responsible for the rapid delivery of large-volume reagents.

[0052] Reference Figure 3 and Figure 8 The filter module 4 is used to separate the solid and liquid components of the suspension formed after the co-precipitation reaction and collect the precipitate containing strontium 90. It mainly consists of a vacuum pump 41 and a filter assembly 42.

[0053] The filter assembly 42 includes a filter cartridge 421, a water collection tank 422, and multiple filter cups 423. The filter cartridge 421 has multiple independent filter compartments 4211 inside, each filter compartment 4211 is used to hold one filter cup 423. The top of the filter compartment 4211 is sealed with a quick-release sealing handle, and the sealing position is equipped with double O-rings to ensure the sealing of the filtration process.

[0054] The filter cylinder 421 has multiple water inlets on its side that are connected to the filter chamber 4211 respectively, and the water inlets are also connected to the co-sedimentation tank 21 through pipelines with solenoid valves; the bottom of the filter cylinder 421 is connected to the collection water tank 422.

[0055] The water collection tank 422 is equipped with a non-contact liquid level sensor 25, and has an inlet and a suction port on the top. The inlet is connected to the bottom of the filter cartridge 421; the suction port is connected to the vacuum pump 41 through a pipeline with a solenoid valve.

[0056] The bottom of the collection tank 422 is provided with an outlet and is connected to the first three-way valve 14 through a pipeline with a solenoid valve. It is used to discharge the filtered and settled seawater through the suction pump 12, the second three-way valve 15 and the output pipeline 13; or to enter the co-sedimentation tank 21 through the suction pump 12 and the second three-way valve 15 for secondary suction filtration.

[0057] The filter module 4 uses a combination of a suction pump 12 and a vacuum pump 41. The suction pump 12 is used for rapid filtration with a large flow rate in the early stage. When air enters the pipeline and causes the suction pump 12 to lose power, the vacuum pump 41 starts to take over and complete the final filtration, ensuring that the sediment is completely collected.

[0058] After filtration is completed, the experimenter can directly remove the filter cup 423 as a whole through the quick-release sealing handle to complete the sediment transfer.

[0059] Reference Figures 2 to 5 The cleaning module 5 is used to automatically clean the inner wall of the co-precipitation tank 21, the stirring paddle 223 and the pipeline after the single sample is processed, so as to prevent the residue from causing cross-contamination. It mainly consists of a rotating nozzle 51, a cleaning water pump 52 and a cleaning water tank 53.

[0060] The rotary nozzle 51 is installed on the top of the co-sedimentation tank 21, which can achieve 360-degree all-round spraying. The cleaning water pump 52 pressurizes the pure water in the cleaning water tank 53 and delivers it to the rotary nozzle 51 to rinse the tank wall and the stirring paddle 223.

[0061] The cleaning wastewater is discharged through the drain outlet at the bottom of the co-precipitation tank 21 and enters the filtration module 4 for filtration to recover residual sediment. After cleaning, the device can directly enter the next sample processing flow.

[0062] In the specific implementation process, the cleaning water tank 53 is also connected to the injection pump. The injection pump can switch to the cleaning water tank 53 to deliver clean water through its own three-way valve, and automatically flush the pipeline and pump body.

[0063] Reference Figure 1 The control unit 6 includes a display screen, operation buttons, emergency stop switch, audible and visual alarm, status indicator lights and electrical box, etc., and can set and automatically execute parameters such as injection volume, dosage, stirring speed, heating temperature, filtration time and cleaning process.

[0064] The complete working process of the device in this application is as follows: After the control unit 6 is started, the suction module 1 selects the corresponding seawater sample through the multi-inlet. The seawater sample is quantitatively extracted into the co-precipitation tank 21 through the filter 16, the input pipeline 11, and the suction pump 12. The liquid level sensor 25 stops the injection after detecting the set volume.

[0065] Subsequently, dilute nitric acid was added to the liquid sample addition assembly 32 to adjust the pH value in the tank to less than 2, thereby inhibiting the premature formation of carbonate hydrolysis and calcium and magnesium precipitation.

[0066] Next, the tracer standard solution is added, and the stirring component 22 is stirred evenly at the set speed. Then, the coprecipitant and sodium hydroxide are added in sequence, and the pH value is adjusted to 9.5 to complete the coprecipitation reaction.

[0067] After the reaction is complete, the filtration process is initiated. The suction pump 12, in conjunction with the vacuum pump 41, draws the suspension into the filtration module 4. The liquid enters the collection tank 422 and is then discharged via the suction pump 12, the second three-way valve 15, and the output pipeline 13. The strontium-90-containing precipitate is retained in the filter cup 423. Some of the waste liquid in the collection tank 422 can also be returned to the co-precipitation tank 21 via the suction pump 12 and the second three-way valve 15 for secondary filtration, further improving the precipitate recovery rate.

[0068] After the single sample is filtered, the cleaning module 5 is activated, and the rotating nozzle 51 automatically rinses the co-precipitation tank 21. The cleaning solution is also filtered to recover the residue.

[0069] After cleaning, the device automatically processes the remaining samples in the same sequence, enabling continuous and automated processing of multiple samples. It can operate unattended at night, greatly improving experimental efficiency and reducing the intensity of manual operation.

[0070] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An automatic enrichment device for seawater Strontium 90 co-precipitation, characterized in that: It includes a suction module (1), a mixing module (2), a material adding module (3), and a filtration module (4); The suction module (1) is connected to the stirring and mixing module (2) and the filtration module (4), and is used to input seawater samples into the stirring and mixing module (2) and output the seawater suspension formed by co-precipitation treatment after passing through the filtration module (4); The stirring and mixing module (2) includes a co-precipitation tank (21) and a stirring assembly (22); the co-precipitation tank (21) is used to hold seawater samples, and the stirring assembly (22) is used to perform stirring after solid and liquid reagents are processed. The material addition module (3) includes a solid sample addition component (31) and a liquid sample addition component (32); the solid sample addition component (31) is used to add solid reagents to the co-precipitation tank (21), and the liquid sample addition component (32) is used to add liquid reagents to the co-precipitation tank (21); The filtration module (4) includes a vacuum pump (41) and a filtration assembly (42); the vacuum pump (41) is used to input the seawater suspension formed by the co-precipitation reaction into the filtration assembly (42), and the filtration assembly (42) is used to filter and collect the seawater suspension.

2. The automatic enrichment device for seawater Strontium 90 co-precipitation according to claim 1, characterized in that: The suction module (1) includes an input pipe (11), a suction pump (12), and an output pipe (13) connected in sequence. The input pipeline (11) includes multiple input pipes with their ends connected to each other, and each input pipe is sequentially connected to a filter (16) and a solenoid valve; The input pipeline (11) and the suction pump are connected through the first three-way valve (14), and the remaining interface of the first three-way valve (14) is connected to the filter module (4); The output pipeline (13) and the suction pump (12) are connected through a second three-way valve (15), and the remaining port of the second three-way valve (15) is connected to the co-precipitation tank (21).

3. The automatic enrichment device for seawater Strontium 90 co-precipitation according to claim 1, characterized in that: The solid sample loading assembly (31) includes a rotating support (311), a turntable (312), and a flipping component (315); The rotating support (311) is positioned above the coprecipitation tank (21), and the top of the coprecipitation tank (21) is provided with a solid reagent addition port; The turntable (312) is vertically mounted on the rotating bracket (311) and rotatably connected thereto, and the rotating bracket is provided with a rotary motor (313) for driving the turntable (312) to rotate in the vertical direction; The turntable (312) has a plurality of cup holders (314) for holding solid reagent cups evenly arranged circumferentially on one side edge away from the rotating support (311). The cup holders (314) are rotatably connected to the turntable (312), and the rotation axis extends to one side of the rotating support (311). The flipping component (315) is horizontally disposed on the rotating bracket (311) and rotatably connected thereto, and a flipping motor (316) is disposed thereon for driving the flipping component (315) to rotate in the horizontal direction. The flipping component (315) has a notch (3151) extending through one end away from the rotating bracket (311). The cup holder (314) has an insert (3141) that matches the notch (3151) at one end of its rotation axis extending to the rotating bracket (311). The notch (3151) is used for the insert (3141) to be inserted. When the turntable (312) rotates, the insert (3141) on the rotating shaft of the cup holder (314) located at the bottom is inserted into the notch (3151), at this time the flipping motor (316) drives the flipping component (315) to rotate, which can drive the cup holder (314) to flip, thereby driving the solid reagent cup to flip.

4. The automatic enrichment device for seawater Strontium 90 co-precipitation according to claim 1, characterized in that: The liquid dispensing assembly (32) includes a rotating frame (321), a dispensing base (322), multiple dispensing pumps (324), and multiple liquid reagent bottles (325); The rotating frame (321) is disposed above the co-precipitation tank (21), the liquid addition base (322) is rotatably connected to the rotating frame (321), and the rotating component is provided with a rotating servo motor (323) for driving the liquid addition base (322) to rotate horizontally; The liquid filling base (322) is uniformly provided with a plurality of liquid filling tubes with liquid level sensors along its circumferential direction. The plurality of liquid filling tubes are respectively connected to a plurality of liquid filling pumps (324), and the plurality of liquid filling pumps (324) are respectively connected to a plurality of liquid reagent bottles (325). The co-precipitation tank (21) is provided with a liquid inlet (71) and a liquid outlet (72) respectively distributed on both sides of the rotating frame (321); the liquid inlet (71) is connected to the co-precipitation tank (21) and is used to allow the liquid inlet pipe to perform liquid addition operation when the liquid inlet base (322) is rotated to its upper position; the liquid outlet (72) is used to allow the liquid inlet pipe to perform liquid discharge operation when the liquid inlet base (322) is rotated to its upper position.

5. The automatic enrichment device for seawater Strontium 90 co-precipitation according to claim 1, characterized in that: The stirring assembly (22) includes a fixing ring (221), a quick-release plate (222), a stirring paddle (223), and a synchronous belt pulley set (224); The fixing ring (221) is horizontally positioned at the top opening of the co-precipitation tank (21), and the quick-release plate (222) is positioned on the fixing ring (221) and movably connected to it; The stirring paddle (223) is vertically arranged inside the co-precipitation tank (21) and rotatably connected to the quick-release plate (222); The synchronous pulley assembly (224) includes a driving pulley, a stirring motor, a driven pulley, a belt, and a locking clamp (2241); The stirring motor is connected to the driving pulley and can slide in the horizontal direction; the driven pulley is connected to the stirring paddle (223), and the belt is sleeved on the driving pulley and the driven pulley; The locking clamp (2241) is disposed between the driving pulley and the driven pulley and is used to drive the stirring motor and the driving pulley to slide in a direction away from or close to the stirring paddle (223); When the positions of the stirring motor and the drive pulley are locked, the handle of the locking clamp (2241) is driven to move downward, and then the locking clamp (2241) drives the stirring motor and the drive pulley to move together in a direction away from the stirring paddle (223) and simultaneously tensions the belt, thereby locking the positions of the stirring motor and the drive pulley and realizing power transmission; When the stirring paddle (223) is disassembled, the handle of the locking clamp (2241) is driven to move upward, and the locking clamp (2241) drives the stirring motor and the drive pulley to move together in the direction close to the stirring paddle (223) and loosen the belt at the same time. At this time, the stirring paddle (223) can be disassembled separately.

6. The automatic enrichment device for seawater strontium 90 co-precipitation according to claim 5, characterized in that: The stirring paddle (223) is equipped with a heating rod, and the co-precipitation tank (21) is equipped with a temperature sensor (24).

7. The automatic enrichment device for seawater strontium 90 co-precipitation according to claim 2, characterized in that: The filtration assembly (42) includes a filter cartridge (421), a water collection tank (422), and multiple filter cups (423); The filter cartridge (421) is provided with multiple filter chambers (4211) inside. The filter chambers (4211) are used to support the filter cup (423), and the top is sealed by a quick-release sealing handle. The filter cylinder (421) has multiple water inlets on its side that are connected to the filter chamber (4211) respectively, and the water inlets are also connected to the bottom drain hole of the co-precipitation tank (21) through a pipeline with a solenoid valve. The water collection tank (422) is located below the filter cylinder (421), and has an inlet and a suction port on the top. The inlet is connected to the bottom of the filter cylinder (421), and the suction port is connected to the vacuum pump (41) through a pipeline with a solenoid valve. The bottom of the water collection tank (422) is provided with an outlet, which is connected to the first three-way valve (14) through a pipeline with a solenoid valve; A liquid level sensor (25) is installed on the water collection tank (422).

8. The automatic enrichment device for seawater Strontium 90 co-precipitation according to claim 1, characterized in that: It also includes a cleaning module (5); The cleaning module (5) includes a rotating nozzle (51), a cleaning water pump (52), and a cleaning water tank (53); The rotary nozzle (51) is located at the top of the co-precipitation tank (21) and is connected in sequence to the cleaning water pump (52) and the cleaning water tank (53).

9. The automatic enrichment device for seawater strontium 90 co-precipitation according to claim 1, characterized in that: The co-precipitation tank (21) is equipped with a pH sensor (23) and multiple liquid level sensors (25); Multiple liquid level sensors (25) are arranged sequentially along the height direction of the co-precipitation tank (21).

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