Automatic liquid replacing and supplementing system and alternating-current electrochemical dissolving system

Abstract

The utility model provides an automatic liquid changing and supplementing system and an alternating current electrochemical dissolving system, the automatic liquid changing and supplementing system comprises a liquid changing mechanism, a plurality of first pipelines, a second pipeline and a plurality of liquid storage containers, the number of the first pipelines is the same as that of the liquid storage containers; each liquid storage container is connected with the liquid changing mechanism through the first pipeline, the liquid changing mechanism is further connected to an external container through a second pipeline, and the liquid changing mechanism is used for outwards conveying a solution in one liquid storage container through the second pipeline; according to the automatic electrolyte replacement device, the electrolyte can be automatically replaced, the operation steps are simplified, the time is saved, and the radiation dose of personnel is reduced.

Description

Technical Field

[0001] This utility model relates to the field of electrochemical device technology, and in particular to an automatic fluid replenishment system and an AC electrochemical dissolution system. Background Technology

[0002] 103 Due to its excellent decay properties, such as low energy (20–23 keV), high initial dose rate (20–24 cGy / h), short half-life (16.96 d), and high cumulative dose output in a short time, Pd has broad application prospects in brachytherapy for prostate cancer and other solid tumors. 103 Pd nuclides are primarily obtained by accelerator proton irradiation of a rhodium target. This method involves five parts: target preparation, irradiation, target dissolution, separation and purification, and quality control. Because rhodium's outer electron configuration is [Kr]4d85s1, it exhibits a penetrating effect of multi-electron atoms, resulting in a completely empty outer electron configuration. This reduces reactivity and demonstrates strong stability. Therefore, efficient dissolution of rhodium is crucial. 103 One of the main technical challenges in mass production of Pd.

[0003] Currently, the main technologies for dissolving rhodium include intermediate-temperature chlorination, aqueous solution chemical dissolution, alloy activation, intermediate-temperature melting, and electrochemical dissolution. Among these, intermediate-temperature melting is commonly used for the preparation of rhodium targets. 103 The medium-temperature melting method for Pd involves thoroughly mixing a certain amount of potassium bisulfate with rhodium powder, then reacting it at a specific temperature to obtain a sinter. The rhodium-containing sinter is then dissolved in dilute acid to obtain a soluble rhodium solution. Using this method, the rhodium target can achieve a solubility of over 98%. However, this method suffers from drawbacks such as a long processing cycle, complex operation, and lack of automation, leading to significant difficulties in industrial applications. The electrochemical dissolution method utilizes the electrode reaction process caused by current passing through an electrolyte. When the anolyte current equals the external electric field current, anodic oxidation dissolves into the solution. Compared to the electrochemical method, this method is not only simpler but also facilitates automation, offering better application prospects.

[0004] However, when dissolving a rhodium target with alternating current, the active chlorine in the electrolyte is gradually consumed as the reaction proceeds. The usual practice is to replenish the active chlorine in the solution by purging chlorine gas. However, the existing alternating current electrochemical dissolution method requires the introduction of toxic chlorine gas, which poses a safety hazard. Furthermore, it requires the use of concentrated hydrochloric acid, which has the problem of strong corrosion to the hot chamber.

[0005] Chinese patent application CN102337554A discloses an electrolytic cell system for dissolving rhodium powder by alternating current arc method and its application. It discloses that after electrolysis for a period of time, for example, 1 to 8 hours, the dissolved rhodium trichloride solution is poured out, new hydrochloric acid is added and an appropriate amount of rhodium powder is replenished, and the alternating current arc dissolution operation is continued. However, when changing hydrochloric acid, it is necessary to repeatedly disassemble and reassemble the electrolytic cell accessories and repeatedly seal them, which is troublesome and results in a high radiation dose for the operators. Utility Model Content

[0006] This invention provides an automatic electrolyte replacement system and an AC electrochemical dissolution system to solve the defects of existing technologies that require repeated disassembly and reassembly of electrolytic cell accessories and repeated sealing when changing hydrochloric acid in electrochemical dissolution reactions. It realizes automatic replacement of electrolyte, eliminating the need for frequent disassembly and reassembly of electrolytic cell accessories and repeated sealing, simplifying the operation steps, greatly saving the time of waiting for the instrument to reach electrolytic equilibrium after disassembly and reassembly of accessories and damage to the seal, and also reducing the radiation dose to the operator.

[0007] In a first aspect, this utility model provides an automatic fluid replacement system, comprising: a fluid replacement mechanism, a plurality of first pipelines, a second pipeline, and a plurality of storage containers. The number of first pipelines is the same as the number of storage containers. Each storage container is connected to the fluid replacement mechanism through the first pipeline. The fluid replacement mechanism is also connected to an external container through the second pipeline. The fluid replacement mechanism is used to transport the solution in one of the storage containers to the outside through the second pipeline, and to send the external solution to another storage container through the second pipeline.

[0008] According to the automatic fluid replacement system provided by this utility model, the fluid replacement mechanism includes an injection pump and a control valve. The injection pump is connected to the control valve and is used to provide power for pumping solution when the control valve is open. The control valve is connected to the second pipeline and a plurality of the first pipelines respectively. The control valve is used to connect the second pipeline to one of the first pipelines when the injection pump is working.

[0009] According to the automatic fluid replacement system provided by this utility model, the injection pump draws 5-20 mL of fluid each time.

[0010] Secondly, this utility model also provides an alternating current electrochemical dissolution system, including an electrolytic cell and an automatic liquid replenishment system as described in the first aspect, wherein a second pipeline of the automatic liquid replenishment system is connected to the electrolytic cell.

[0011] According to the AC electrochemical dissolution system provided by this utility model, the electrolytic cell includes:

[0012] The first U-shaped tube is used to hold the electrolyte;

[0013] The second U-shaped tube is sleeved on the outside of the first U-shaped tube. The height of the opening of the second U-shaped tube is greater than that of the opening of the first U-shaped tube, and the outer wall of the opening of the first U-shaped tube is sealed to the inner wall of the second U-shaped tube. The second U-shaped tube is used to introduce cooling medium to cool the first U-shaped tube.

[0014] According to the AC electrochemical dissolution system provided by this utility model, the second U-shaped tube is provided with a pair of interfaces, which are used for the entry and exit of cooling medium respectively, and the interface is located below the opening of the first U-shaped tube.

[0015] According to the AC electrochemical dissolution system provided by this utility model, the outer wall of the first U-shaped tube and the inner wall of the second U-shaped tube are sealed together by a glass component.

[0016] According to the AC electrochemical dissolution system provided by this utility model, the opening of the second U-shaped tube is 30-100mm higher than the opening of the first U-shaped tube.

[0017] The AC electrochemical dissolution system provided by this utility model also includes a coolant circulation device, which is provided with an inlet pipe and an outlet pipe, and a pair of interfaces are respectively connected to the inlet pipe and the outlet pipe.

[0018] The AC electrochemical dissolution system provided by this utility model also includes a tail gas recovery mechanism, which includes an intake pipe and a processing device. One end of the intake pipe is connected to the inside of the first U-shaped tube, and the other end is connected to the processing device.

[0019] This utility model provides an automatic solution replacement and replenishment system that automatically completes the replacement and replenishment of solutions. It eliminates the need for frequent disassembly and resealing of external containers, simplifies the operation process, saves time spent on repeated disassembly and resealing, and reduces the workload of operators.

[0020] This utility model provides an AC electrochemical dissolution system that employs the aforementioned automatic electrolyte replacement system. This system enables automatic electrolyte replacement without the need for frequent disassembly and reassembly of electrolytic cell accessories and repeated sealing, simplifying the operation process, facilitating large-scale production, and reducing radiation dose to operators. Furthermore, since the solution in the first U-tube reacts at a high temperature, overflow is possible. By employing a double-layer U-tube design, with the second U-tube fitted outside the first U-tube and its opening height greater than that of the first U-tube, even if electrolyte overflows, it enters the portion of the second U-tube higher than the first U-tube and then flows back into the first U-tube. This prevents electrolyte from entering the cooling medium in the lower second U-tube, thus avoiding radiation and pollution caused by electrolyte overflow. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the automatic fluid replacement system provided in this embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the AC electrochemical dissolution system provided in an embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram of the electrolytic cell used in the AC electrochemical dissolution system provided in this embodiment of the utility model.

[0025] Figure label:

[0026] 1. Liquid storage container; 2. Injection pump; 3. Control valve; 4. First pipeline; 5. Second pipeline; 6. Electrolytic cell; 7. First U-tube; 8. Second U-tube; 9. Glass component; 10. Interface. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] This embodiment provides an automatic fluid replacement system, including: a fluid replacement mechanism, multiple first pipelines 4, second pipelines 5, and multiple storage containers 1. The number of first pipelines 4 and storage containers 1 is the same. Each storage container 1 is connected to the fluid replacement mechanism through the first pipeline 4. The fluid replacement mechanism is also connected to an external container through the second pipeline 5. The fluid replacement mechanism is used to transport the solution in one of the storage containers 1 to the outside through the second pipeline 5, and to send the external solution to another storage container 1 through the second pipeline 5.

[0029] This setup allows the liquid exchange mechanism to adjust the liquid flow direction as needed, increasing the system's flexibility. It enables automatic solution replacement and replenishment, eliminating the need for frequent disassembly and resealing of external containers. This simplifies the operation, saves time spent on repeated disassembly and resealing, and reduces the workload of operators.

[0030] In some embodiments, the fluid exchange mechanism includes an injection pump 2 and a control valve 3. The injection pump 2 draws 5-20 mL of fluid each time. The control valve 3 can be an electric rotary valve. Electric rotary valves are existing technology, and their structure and principle are not the focus of this article and will not be described here. The injection pump 2 is connected to the control valve 3 to provide power for pumping the solution when the control valve 3 is open. The control valve 3 is connected to the second pipeline 5 and a plurality of first pipelines 4 respectively. The control valve 3 is used to connect the second pipeline 5 to one of the first pipelines 4 when the injection pump 2 is working.

[0031] With this configuration, the syringe pump 2 can precisely control the amount of solution pumped, ensuring that the amount of solution delivered each time meets the preset requirements. Through the selective connection of the control valve 3, precise control of the liquid flow in different pipelines can be achieved. When the syringe pump 2 is connected to multiple first pipelines 4 through the control valve 3, the time for changing pipelines can be reduced by switching different first pipelines 4, thereby improving work efficiency. This is suitable for occasions where the infusion path needs to be changed frequently. In addition, compared to equipping each liquid storage container 1 with an independent syringe pump 2, using a syringe pump 2 in conjunction with the control valve 3 can significantly reduce equipment costs and maintenance costs.

[0032] This embodiment also provides an AC electrochemical dissolution system, including an electrolytic cell 6 and the above-mentioned automatic liquid replenishment system, wherein the second pipeline 5 of the automatic liquid replenishment system is connected to the electrolytic cell 6.

[0033] Specifically, the electrolytic cell 6 includes a first U-shaped tube 7 and a second U-shaped tube 8, both made of quartz glass. The second U-shaped tube 8 is sleeved on the outside of the first U-shaped tube 7, and the height of the opening of the second U-shaped tube 8 is greater than the height of the opening of the first U-shaped tube 7. The outer wall of the opening of the first U-shaped tube 7 is sealed to the inner wall of the second U-shaped tube 8. The first U-shaped tube 7 is used to hold the electrolyte, and the second U-shaped tube 8 is used to introduce a cooling medium to cool the first U-shaped tube 7.

[0034] This design, with the opening height of the second U-tube 8 greater than that of the first U-tube 7, ensures that even if electrolyte overflows, it will only enter the portion of the second U-tube 8 above the first U-tube 7 and then flow back into the first U-tube 7. This prevents electrolyte from entering the cooling medium in the lower second U-tube 8, effectively avoiding electrolyte overflow caused by the high reaction temperature of the solution in the first U-tube 7. This also prevents corrosion and contamination of the heat chamber by the electrolyte.

[0035] Furthermore, the second U-shaped tube 8 is provided with a pair of ports 10, which are used for the entry and exit of cooling medium respectively. The ports 10 are located below the opening of the first U-shaped tube 7, so that the cooling medium flows downward under the action of gravity after entering the second U-shaped tube 8, thereby preventing the cooling medium from entering the first U-shaped tube 7.

[0036] In this embodiment, a coolant circulation device is also included. The coolant circulation device is provided with an inlet pipe and an outlet pipe, and a pair of interfaces 10 are respectively connected to the inlet pipe and the outlet pipe.

[0037] With this configuration, by setting up a pair of interfaces 10, it is possible to connect to a coolant circulation device to continuously supply cooling medium to the second U-tube 8, thereby regulating the temperature in the first U-tube 7 and maximizing the cooling of the solution in the first U-tube 7.

[0038] Furthermore, the outer wall of the opening of the first U-tube 7 and the inner wall of the second U-tube 8 are sealed together by a glass component 9; that is, glass is used as the welding material. The glass softens and flows at high temperatures, thereby filling the gap between the outer wall of the opening of the first straight tube and the inner wall of the second straight tube and forming a seal. This creates a sealed and reliable fixed connection between the top of the first U-tube 7 and the second U-tube 8, preventing coolant from entering the first U-tube 7.

[0039] In some embodiments, the opening of the second U-tube 8 is 30-100mm higher than the opening of the first U-tube 7. That is, the height difference h between the opening of the second U-tube 82 and the opening of the first U-tube 71 is 30-100mm, preferably 60-90mm, and more preferably 65-74mm. This ensures that even if the electrolyte overflows from the first U-tube 7, it will enter the second U-tube 8, thus avoiding pollution to the surrounding environment caused by the electrolyte overflow.

[0040] like Figure 3 As shown, the first U-shaped tube 7 includes a first arc-shaped tube and a pair of first straight tubes, with the two ends of the first arc-shaped tube connected to the pair of first straight tubes respectively; the second U-shaped tube 8 includes a second arc-shaped tube and a pair of second straight tubes, with the two ends of the second arc-shaped tube connected to the pair of second straight tubes respectively; the second straight tube is sleeved on the outside of the first straight tube, the second arc-shaped tube is sleeved on the outside of the first arc-shaped tube, the height of the opening of the second straight tube is greater than the height of the opening of the first straight tube, and the interface 10 is provided on the second straight tube and located below the opening of the first straight tube.

[0041] In some embodiments, the diameter of the first arc-shaped tube is smaller than the diameter of the first straight tube. The smaller arc-shaped tube diameter can better control the formation and discharge of bubbles, prevent bubble aggregation from affecting the electrolysis process, and help improve the uniformity of the electrolyte solution and improve the electrolysis efficiency. For example, the diameter of the first arc-shaped tube is 5-15 mm and the diameter of the first straight tube is 30-70 mm. Preferably, the diameter of the first arc-shaped tube is 8-13 mm and the diameter of the first straight tube is 40-54 mm. Further, the diameter of the first arc-shaped tube is 10-13 mm and the diameter of the first straight tube is 45-54 mm.

[0042] In this embodiment, a tail gas recovery mechanism is also included. The tail gas recovery mechanism includes an intake pipe and a processing device. One end of the intake pipe is connected to the inside of the first U-shaped pipe 7, and the other end is connected to the processing device. A vacuum pump is installed on the intake pipe to provide suction for passing the tail gas generated during the electrolysis process into the processing device. The processing device can be a conventional alkaline absorption device for treating waste gases containing acidic gases such as SO2, HCl, and H2S. These harmful gases are absorbed by an alkaline solution to achieve the purpose of purifying the gas.

[0043] The present invention will now be described with reference to specific embodiments. It should be noted that these embodiments are merely descriptive and do not limit the present invention in any way.

[0044] Example 1

[0045] An automatic fluid replacement system, with the following structure: Figure 1 As shown, the system includes two liquid storage containers 1, an injection pump 2, and an electric rotary valve. The injection pump 2 and the electric rotary valve are connected. The two liquid storage containers 1 are respectively connected to the electric rotary valve through a first pipe 4. One end of the second pipe 5 is connected to the electric rotary valve, and the other end is connected to the outside, such as an electrolytic cell 6. The first pipes 4 extend into the bottom of the two liquid storage containers 1. When the injection pump 2 is working, the electric rotary valve is only connected to one liquid storage container 1 through the first pipe, and the other first pipes are closed. The injection pump 2 draws the electrolyte from the connected liquid storage container 1 to the electrolytic cell 6 for electrolysis. After the reaction is completed, the electrolyte is drawn into the other liquid storage container 1, realizing automatic replacement of the electrolyte.

[0046] Preparation of rhodium target by electrochemical dissolution 103 Taking Pd as an example, during the electrodissolution process, rhodium reacts with Cl in the electrolyte. - As the reaction proceeds, HCl is gradually consumed, and some HCl is also lost through evaporation. Therefore, after a period of time, the dissolution of rhodium stops. This automatic replenishment system allows for the replenishment of HCl without introducing toxic chlorine gas. -The timely replacement of the electrolyte hydrochloric acid ensures the continuous operation of the rhodium electrolysis process, while also reducing the radiation dose to operators.

[0047] Automatic electrolyte replacement system debugging: The function of this automatic electrolyte replacement system is to extract electrolyte to replace hydrochloric acid and continue electrolysis. Therefore, it is necessary to verify the accuracy and stability of the liquid extraction volume. In this embodiment, a certain amount of ultrapure water is extracted and repeated three times to test the stability of the liquid extraction volume. Then, experiments with different liquid extraction volumes are conducted to obtain the usable liquid extraction volume range. Experiments with different liquid extraction volumes of 5mL, 10mL, 15mL and 20mL are conducted to obtain the usable liquid extraction volume range. The test results are shown in the experimental data table of different liquid extraction volumes below.

[0048]

[0049] The results show that when the liquid volume is 5-20 mL, the maximum volume deviation is 4.3%, which is within the allowable error range of <5%; the maximum standard deviation is 0.04 mL, which is within the allowable standard deviation range; when the liquid volume is 15 mL, the volume deviation is the smallest and the liquid sampling accuracy is the highest; the standard deviation is 0.02 mL, indicating strong sampling stability.

[0050] The automatic electrolyte replacement system in this embodiment can be used to replenish the active chlorine in the rhodium target by alternating current electrochemical dissolution, resulting in an alternating current electrochemical method for replenishing the active chlorine in the rhodium target. It automatically completes the electrolyte replacement, is simple to operate, and reduces the radiation dose to workers.

[0051] Example 2

[0052] An AC electrochemical dissolution system, such as Figure 2 As shown, it includes an electrolytic cell 6, a coolant circulation device, a tail gas recovery mechanism, and the aforementioned automatic fluid replacement system.

[0053] The coolant circulation device is a small low-temperature coolant circulator connected to a pair of interfaces 10 of the electrolytic cell 6. The coolant in the second U-tube 8 absorbs the heat emitted during the electrolysis process and its temperature rises. It is then cooled down by the coolant circulation device and injected back into the second U-tube 8. The tail gas recovery mechanism may include a small vacuum pump and an alkali absorption device. The small vacuum pump is connected to the electrolytic cell 6 through a suction pipe that extends into the first U-tube 7, so that the small vacuum pump can suck out the tail gas generated inside the electrolytic cell 6.

[0054] The second U-shaped tube 8 is sleeved on the outside of the first U-shaped tube 7. The first U-shaped tube 7 is used to hold the electrolyte. The second U-shaped tube 8 is used to introduce the cooling medium to cool the first U-shaped tube 7. The height of the opening of the second U-shaped tube 8 is greater than the height of the opening of the first U-shaped tube 7. The opening of the second U-shaped tube 8 is 70mm higher than the opening of the first U-shaped tube 7.

[0055] The AC electrochemical dissolution system provided in this embodiment can be used for continuous electrolysis of rhodium targets and 103 Pd nuclide preparation or other applicable situations.

[0056] The automatic fluid replenishment system and AC electrochemical dissolution system provided by this utility model are used for active chlorine replenishment, continuous electrolysis of rhodium targets, and... 103 During the preparation of Pd nuclides, after the electrolysis reaction has continued for a period of time, such as 30 minutes, the injection pump 2 draws the electrolyte from the electrolytic cell 6 into a storage container 1, and fresh electrolyte from another storage container 1 is drawn and injected into the electrolytic cell 6 to continue electrolysis; this process is repeated 3-5 times. Of course, after the electrolysis reaction has proceeded for a certain period of time, fresh electrolyte can also be directly drawn from storage container 1 and injected into the electrolytic cell 6 to continue the electrolysis reaction.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An automatic fluid replacement system, characterized in that, include: The system includes a liquid exchange mechanism, multiple first pipes (4), second pipes (5), and multiple liquid storage containers (1). The number of first pipes (4) and liquid storage containers (1) is the same. Each liquid storage container (1) is connected to the liquid exchange mechanism through the first pipe (4). The liquid exchange mechanism is also connected to an external container through the second pipe (5). The liquid exchange mechanism is used to transport the solution in one of the liquid storage containers (1) to the outside through the second pipe (5) and to send the external solution to another liquid storage container (1) through the second pipe (5).

2. The automatic fluid replacement system according to claim 1, characterized in that, The fluid exchange mechanism includes an injection pump (2) and a control valve (3). The injection pump (2) is connected to the control valve (3) and is used to provide power for pumping the solution when the control valve (3) is open. The control valve (3) is connected to the second pipeline (5) and a plurality of the first pipelines (4) respectively. The control valve (3) is used to connect the second pipeline (5) to one of the first pipelines (4) when the injection pump (2) is working.

3. The automatic fluid replacement system according to claim 2, characterized in that, The syringe pump (2) draws 5-20 mL of liquid each time.

4. An alternating current electrochemical dissolution system, characterized in that, It includes an electrolytic cell (6) and an automatic fluid replenishment system as described in any one of claims 1-3, wherein the second pipeline (5) of the automatic fluid replenishment system is connected to the electrolytic cell (6).

5. The AC electrochemical dissolution system according to claim 4, characterized in that, The electrolytic cell (6) includes: The first U-shaped tube (7) is used to hold the electrolyte; The second U-shaped tube (8) is sleeved on the outside of the first U-shaped tube (7). The height of the opening of the second U-shaped tube (8) is greater than the height of the opening of the first U-shaped tube (7). The outer wall of the opening of the first U-shaped tube (7) is sealed to the inner wall of the second U-shaped tube (8). The second U-shaped tube (8) is used to introduce cooling medium to cool the first U-shaped tube (7).

6. The AC electrochemical dissolution system according to claim 5, characterized in that, The second U-shaped tube (8) is provided with a pair of ports (10), which are used to allow cooling medium to enter and exit respectively, and the ports (10) are located below the opening of the first U-shaped tube (7).

7. The AC electrochemical dissolution system according to claim 5, characterized in that, The outer wall of the opening of the first U-tube (7) is sealed to the inner wall of the second U-tube (8) by a glass component (9).

8. The AC electrochemical dissolution system according to claim 5, characterized in that, The opening of the second U-shaped tube (8) is 30-100mm higher than the opening of the first U-shaped tube (7).

9. The AC electrochemical dissolution system according to claim 6, characterized in that, It also includes a coolant circulation device, which is provided with an inlet pipe and an outlet pipe, and a pair of the interfaces (10) are respectively connected to the inlet pipe and the outlet pipe.

10. The AC electrochemical dissolution system according to claim 5, characterized in that, It also includes an exhaust gas recovery mechanism, which includes an intake pipe and a processing device. One end of the intake pipe is connected to the inside of the first U-shaped pipe (7), and the other end is connected to the processing device.

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