Purification device and method for production of iodine-131 using reactor with uranyl nitrate solution as fuel

Abstract

A purification device and method for production of iodine-131 using a nuclear reactor with a uranyl nitrate aqueous solution as fuel, relating to the technical field of production of radioisotopes. The device comprises a carrier gas cylinder (01), an evaporator (03), a waste liquid tank (10), a first-stage absorption tank (05), a second-stage absorption tank (06), a third-stage absorption tank (07) and a product tank (09). The carrier gas cylinder (01) is communicated with the evaporator (03) by means of a gas inlet pipe. A liquid feeding opening (04) is provided at the top of the evaporator (03). A gas outlet pipe is connected to the top of the evaporator (03), the gas outlet pipe being communicated with the first-stage absorption tank (05); the first-stage absorption tank (05) is communicated with the second-stage absorption tank (06) by means of a pipe, and the second-stage absorption tank (06) is communicated with the third-stage absorption tank (07) by means of a pipe. The bottom of each of the first-stage absorption tank (05), the second-stage absorption tank (06) and the third-stage absorption tank (07) is connected to a liquid outlet pipe, the liquid outlet pipes being all communicated with the product tank (09). The bottom of the evaporator (03) is connected to the waste liquid tank (10) by means of a liquid discharge pipe. Using the device and method for purifying iodine-131 achieves high product recovery rate and high product purity, ensuring that an obtained sodium iodide [131I] solution product can satisfy the requirements of medical technical specifications.

Description

Iodine-131 purification device and method for reactor production using uranyl nitrate solution as fuel Technical Field

[0001] The present invention relates to the technical field of radioisotope production and purification, and in particular to a device and method for purifying iodine-131 produced by a reactor using uranyl nitrate solution as fuel. Background Art

[0002] Iodine-131 is an important medical radionuclide and the earliest and most widely used therapeutic nuclide in nuclear medicine. Iodine-131 is a world-recognized effective method for treating hyperthyroidism and thyroid cancer. In addition, in recent years, the gradual development of iodine-131-labeled monoclonal antibodies for the treatment of tumors has further promoted the application of iodine-131. Therefore, the market demand for iodine-131 has also gradually increased.

[0003] Iodine-131 is usually prepared by neutron activation or 235 Iodine-131 can be produced on a large scale using a uranium fission target method and a U-fission target method. However, these two methods are limited in scale, generate a lot of radioactive waste, and have high production costs. Using a homogeneous nuclear reactor fueled by uranyl nitrate solution to produce iodine-131 allows for large-scale production. This method produces less waste and is low-cost, making it promising for widespread adoption.

[0004] Uranyl nitrate solution is a uniform aqueous solution of nuclear fuel. When a nuclear reactor is in operation, a large amount of fission products are produced. The valence state of the fission product iodine in the acidic solution is relatively complex. In the relevant public literature on the extraction and separation of Mo and I in solution reactors, the fuel solution of the solution reactor is usually passed through an alumina column and a Mo and I separation column to obtain an iodine-131 product. However, in the iodine-131 product, the alumina and Mo and I separation column materials will fall off to varying degrees, resulting in a high content of aluminum and other impurities in the product. Therefore, the current processing device still has the problem of low purity and low recovery rate of the iodine-131 product after treatment. The iodine-131 product needs to be further purified to obtain iodine that meets the requirements of medical technical indicators. 131 I] Sodium chloride solution product

[0005] Summary of the Invention

[0006] The technical problem to be solved by the present invention is that the current processing device still has the problem that the purity and recovery rate of the iodine-131 product after treatment are low. The purpose is to provide an iodine-131 purification device and method for reactor production using uranyl nitrate solution as fuel. After iodine-131 purification, the device and method have a high recovery rate and high purity of the product obtained; the device can be operated in a hot room or a shielded box to reduce the exposure dose to personnel; the iodine-131 nuclide can be effectively purified to produce iodine that meets the requirements of medical technical indicators. 131 I] sodium chloride solution product.

[0007] The present invention is achieved through the following technical solutions:

[0008] In the first aspect, the present application provides a device and method for purifying iodine-131 produced by a reactor using uranyl nitrate solution as fuel, comprising a carrier gas bottle, an evaporator, a waste liquid tank, a primary absorption tank, a secondary absorption tank, a tertiary absorption tank, and a product tank;

[0009] The carrier gas bottle is connected to the evaporator through an air inlet pipe; a liquid filling port is provided on the top of the evaporator;

[0010] The top of the evaporator is connected to an air outlet pipe, the air outlet pipe is connected to the primary absorption tank, the primary absorption tank is connected to the secondary absorption tank through a pipe, and the secondary absorption tank is connected to the tertiary absorption tank through a pipe;

[0011] The bottoms of the primary absorption tank, the secondary absorption tank, and the tertiary absorption tank are all connected to liquid outlet pipes, and the liquid outlet pipes are all connected to the product tank;

[0012] The bottom of the evaporator is connected to the waste liquid tank through a drainage pipe.

[0013] When using this device to process crude iodine products, after passing through the primary, secondary, and tertiary absorption cells, the corresponding pneumatic valves are opened, allowing the absorption liquid in these cells to flow into the product tank by gravity. This reduces contact between pumps and other equipment and the radioactive solution, increasing system reliability. Furthermore, the pipes connecting the primary, secondary, and tertiary absorption cells can be combined into a single pipe connected to the sample tank, reducing the number of pipes required.

[0014] The iodine-131 purification device produced by the uranyl nitrate aqueous solution reactor of the present invention can purify iodine-131, and the recovery rate of the iodine product obtained is high, and the recovery rate is as high as 95% or more, and the purity of the iodine product is also very high, and the iodine-131 nuclide can be effectively purified to produce iodine that meets the requirements of medical technical indicators. 131 I] sodium chloride solution product, and the device can also be operated in a hot room or a shielding box, reducing the radiation dose of the workers, and it is also very convenient to operate in the hot room and the shielding box.

[0015] Furthermore, the air inlet pipe, air outlet pipe, liquid outlet pipe, liquid discharge pipe and the pipes connecting the primary absorption tank, the secondary absorption tank and the tertiary absorption tank are all connected with pneumatic valves, and the pneumatic valves are all communicatively connected to the controller.

[0016] The present invention connects pneumatic valves to all pipelines, thereby facilitating the control of each step in the purification process. At the same time, the pneumatic valves are communicatively connected to the controller, thereby enabling the device to realize the function of automatic control.

[0017] Among them, all pipes are made of materials that do not react with iodine, such as quartz glass, polytetrafluoroethylene, etc.

[0018] Furthermore, the gas in the carrier gas bottle is an oxidizing gas.

[0019] The oxidizing gas contained in the carrier gas bottle is an oxidizing gas such as oxygen and ozone.

[0020] Furthermore, the air outlet of the air inlet pipe is immersed in the liquid surface of the solution in the evaporator.

[0021] The present invention allows the gas outlet of the gas inlet pipe to enter the solution liquid level of the evaporator, so that the gas introduced can also play the function of stirring the solution and accelerate the gas carrying effect.

[0022] The flow rate of the introduced gas is 20 mL / min to 80 mL / min.

[0023] Furthermore, the temperature of the solution in the evaporator is controlled at 60°C to 95°C.

[0024] The evaporator has a heating function and can be heated by electromagnetic means, enabling remote operation of the hot chamber and controlling the temperature inside the evaporator at 60°C to 95°C.

[0025] Furthermore, the solution loaded into the absorption tank is an alkaline solution.

[0026] Furthermore, the alkaline solution includes a sodium hydroxide solution, and the concentration of the sodium hydroxide solution is 0.1 mol / L to 2.0 mol / L.

[0027] Furthermore, the tail ends of the air inlet pipes of the primary absorption tank, the secondary absorption tank, and the tertiary absorption tank are all connected to sand cores.

[0028] Furthermore, the pore size of the sand core of the primary absorption tank is 10 μm to 40 μm; the pore size of the sand core of the secondary absorption tank is 0.1 mm to 0.5 mm; and the pore size of the sand core of the tertiary absorption tank is 1 mm to 5 mm.

[0029] The present application can increase the gas absorption efficiency by connecting sand cores at the tail ends of the air inlet pipes of the first-stage absorption tank, the second-stage absorption tank, and the third-stage absorption tank. The filtration aperture of the sand core gradually decreases in the order of the first-stage absorption tank, the second-stage absorption tank, and the third-stage absorption tank, which can reduce the resistance of the system.

[0030] In a second aspect, the present application provides a method for purifying iodine-131 produced in a reactor fueled by uranyl nitrate solution, using the iodine-131 purification device produced by the above-mentioned uranyl nitrate aqueous solution reactor, and the specific method is as follows:

[0031] Step 1: Add iodine product and sodium sulfite solution to the evaporator; add alkaline solution to the primary absorption tank, the secondary absorption tank, and the tertiary absorption tank;

[0032] Step 2: Adjust the temperature of the evaporator to 60℃~95℃;

[0033] Step 3: Introduce oxidizing gas into the evaporator, and the gas generated after reacting with the iodine product in the evaporator enters the primary absorption tank, the secondary absorption tank, and the tertiary absorption tank in sequence; the product generated after treatment in the absorption tank enters the product tank.

[0034] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0035] (1) After iodine-131 is purified by the iodine-131 purification device produced by the uranyl nitrate aqueous solution reactor of the present invention, the recovery rate of the iodine product obtained is high, and the recovery rate is as high as more than 95%. The purity of the iodine product is also very high, and the iodine-131 nuclide can be effectively purified to produce iodine that meets the requirements of medical technical indicators. 131 I] sodium chloride solution product, and the device can also be operated in a hot room or a shielding box, reducing the radiation dose of the workers, and the operation in the hot room and the shielding box is also very convenient;

[0036] (2) The present invention facilitates the control of each step in the purification process by connecting pneumatic valves to all pipelines, and at the same time, the pneumatic valves are communicatively connected to the controller, so that the device can realize the function of automatic control;

[0037] (3) The present invention allows the gas outlet of the air inlet pipe to enter the solution surface of the evaporator, so that the gas introduced can also play the function of stirring the solution and accelerate the gas carrying effect;

[0038] (4) The present application increases the gas absorption efficiency by connecting sand cores to the tail ends of the air inlet pipes of the primary absorption tank, the secondary absorption tank, and the tertiary absorption tank. The filter aperture of the sand cores gradually decreases in the order of the primary absorption tank, the secondary absorption tank, and the tertiary absorption tank, thereby reducing the resistance of the system.

[0039] (5) The purification method of iodine-131 produced by the uranyl nitrate aqueous solution type reactor of the present invention is simple to operate, the purity of the obtained iodine product is very high, and the recovery rate of the iodine product is also high. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the examples. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort. In the drawings:

[0041] FIG1 is a schematic diagram of the structure of an iodine-131 purification device produced by a reactor using uranyl nitrate solution as fuel in the present invention.

[0042] The markings and corresponding component names in the attached figure are: 01-carrier gas bottle, 02-pneumatic valve, 03-evaporator, 04-liquid filling port, 05-primary absorption tank, 06-secondary absorption tank, 07-tertiary absorption tank, 08-sand core, 09-product tank, 10-waste liquid tank. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0044] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that these specific details are not necessarily employed to practice the present invention. In other embodiments, well-known materials or methods are not specifically described to avoid obscuring the present invention.

[0045] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present invention. Therefore, appearances of the phrases "one embodiment," "an embodiment," "an example," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combinations and / or subcombinations. Furthermore, it will be understood by those of ordinary skill in the art that the figures provided herein are for illustrative purposes only and are not necessarily drawn to scale. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0046] In the description of the present invention, the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0047] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0048] Example 1

[0049] As shown in FIG1 , this embodiment provides a device and method for purifying iodine-131 produced in a reactor using uranyl nitrate solution as fuel. The device comprises a carrier gas bottle 01, an evaporator 03, a waste liquid tank 10, a primary absorption tank 05, a secondary absorption tank 06, a tertiary absorption tank 07, and a product tank 09.

[0050] The carrier gas bottle 01 is connected to the evaporator 03 through an air inlet pipe; a liquid filling port 04 is provided on the top of the evaporator 03;

[0051] An air outlet pipe is connected to the top of the evaporator 03, which is connected to the primary absorption tank 05, the primary absorption tank is connected to the secondary absorption tank 06 through a pipe, and the secondary absorption tank 06 is connected to the tertiary absorption tank 07 through a pipe;

[0052] The bottoms of the primary absorption tank 05, the secondary absorption tank 06, and the tertiary absorption tank 07 are all connected to liquid outlet pipes, which are all connected to the product tank 09;

[0053] The bottom of the evaporator 03 is connected to the waste liquid tank 10 through a drainage pipe.

[0054] When using this device to process crude iodine products, after processing in the primary absorption cell 05, the secondary absorption cell 06, and the tertiary absorption cell 07, the corresponding pneumatic valve 02 is opened, allowing the absorption liquid in the primary absorption cell 05, the secondary absorption cell 06, and the tertiary absorption cell 07 to flow into the product tank 09 by gravity. This reduces contact between equipment such as pumps and the radioactive solution, increasing system reliability. Furthermore, the pipes connecting the primary absorption cell 05, the secondary absorption cell 06, and the tertiary absorption cell 07 can be combined into a single pipe connected to the sample tank, thus reducing the number of pipes installed.

[0055] The method for purifying the crude iodine product using the above-mentioned device is:

[0056] S1: Add 100 mL of iodine product and 10 mL of 10 g / L sodium sulfite solution to the evaporator 03; add 0.1 mol / L sodium hydroxide solution to the primary absorption tank 05, the secondary absorption tank 06, and the tertiary absorption tank 07;

[0057] S2: Adjust the temperature of evaporator 03 to 60°C;

[0058] S3: Oxygen is introduced into the evaporator 03 (gas flow rate is 20 mL / min). The gas generated after reacting with the iodine product in the evaporator 03 enters the primary absorption tank 05, the secondary absorption tank 06, and the tertiary absorption tank 07 in sequence; the product generated after treatment in the absorption tank enters the product tank 09.

[0059] The crude iodine product was purified using the above device. After one hour of purification, the recovery rate of iodine-131 obtained was 92.4%, and its purity also met the requirements of medical technical indicators.

[0060] Comparative Example 1

[0061] This comparative example provides a purification method for iodine-131 produced in a nuclear reactor using an aqueous uranyl nitrate solution as fuel. Unlike Example 1, the temperature in the evaporator set in this comparative example is 55° C., and the other technical features are exactly the same as those in Example 1.

[0062] After purification for 1 hour using the technical solution of this comparative example, the recovery rate of iodine-131 obtained was 82.1%, which was much lower than the recovery rate of Example 1, and its purity did not meet the requirements of medical technical indicators.

[0063] Comparative Example 2

[0064] This comparative example provides a purification method for iodine-131 produced in a reactor using uranyl nitrate solution as fuel. Unlike Example 1, the temperature in the evaporator in this comparative example is set at 100°C. Other technical features are exactly the same as those in Example 1.

[0065] After purification for 1 hour using the technical solution of this comparative example, the recovery rate of iodine-131 obtained was 94.5%, but the impurity content in the iodine-131 product was high and its purity did not meet the requirements of medical technical indicators.

[0066] Example 2

[0067] Based on Example 1, this example provides a purification apparatus and method for iodine-131 produced in a reactor using uranyl nitrate solution as fuel. Unlike Example 1, this example comprises pneumatic valves 02 connected to the air inlet pipe, air outlet pipe, liquid outlet pipe, liquid drain pipe, and the pipes connecting the primary absorption tank 05, the secondary absorption tank 06, and the tertiary absorption tank 07. These valves are all communicatively connected to a controller. Other technical features are identical to those of Example 1.

[0068] Compared with Example 1, the advantage of this embodiment is that by connecting pneumatic valves 02 to all pipelines, it is convenient to control each step in the purification process, and by communicating with the pneumatic valves 02 and the controller, the device can realize the function of automatic control.

[0069] All the pipes in this embodiment are made of quartz glass that does not react with iodine.

[0070] The method for purifying the crude iodine product using the above-mentioned device is:

[0071] S1: Add 100 mL of iodine product and 10 mL of 10 g / L sodium sulfite solution to the evaporator 03; add 1 mol / L sodium hydroxide solution to the primary absorption tank 05, the secondary absorption tank 06, and the tertiary absorption tank 07;

[0072] S2: Adjust the temperature of evaporator 03 to 80°C;

[0073] S3: Oxygen is introduced into the evaporator 03 (gas flow rate is 40 mL / min). The gas generated after reacting with the iodine product in the evaporator 03 enters the primary absorption tank 05, the secondary absorption tank 06, and the tertiary absorption tank 07 in sequence; the product generated after treatment in the absorption tank enters the product tank 09.

[0074] The crude iodine product was purified using the above device. After one hour of purification, the recovery rate of iodine-131 obtained was 95.8%, and its purity also met the requirements of medical technical indicators.

[0075] Example 3

[0076] Based on Example 1, this example provides a purification apparatus and method for producing iodine-131 in a reactor fueled by a uranyl nitrate solution. Unlike Example 1, the outlet of the air inlet pipe in this example is immersed in the liquid surface of the solution within evaporator 03. Other technical features are identical to those of Example 1.

[0077] Compared with Example 1, the advantage of this embodiment is that the gas outlet of the air inlet pipe enters the solution level of the evaporator 03, so that the incoming gas can also stir the solution and accelerate the gas carrying effect.

[0078] The method for purifying the crude iodine product using the above-mentioned device is:

[0079] S1: Add 100 mL of iodine product and 10 mL of 10 g / L sodium sulfite solution to the evaporator 03; add 2 mol / L sodium hydroxide solution to the primary absorption tank 05, the secondary absorption tank 06, and the tertiary absorption tank 07;

[0080] S2: Adjust the temperature of evaporator 03 to 90°C;

[0081] S3: Oxygen is introduced into the evaporator 03 (gas flow rate is 80 mL / min). The gas generated after reacting with the iodine product in the evaporator 03 enters the primary absorption tank 05, the secondary absorption tank 06, and the tertiary absorption tank 07 in sequence; the product generated after treatment in the absorption tank enters the product tank 09.

[0082] The crude iodine product was purified using the above device. After one hour of purification, the recovery rate of iodine-131 obtained was 98.7%, and its purity also met the requirements of medical technical indicators.

[0083] Example 4

[0084] Based on Example 1, this example provides a purification apparatus and method for iodine-131 produced in a reactor fueled by uranyl nitrate solution. Unlike Example 1, this example features sand cores 08 connected to the tail ends of the air inlet pipes of the primary absorption cell 05, the secondary absorption cell 06, and the tertiary absorption cell 07. The pore diameter of sand core 08 in primary absorption cell 05 is 10 μm; the pore diameter of sand core 08 in secondary absorption cell 06 is 0.1 mm; and the pore diameter of sand core 08 in tertiary absorption cell 07 is 1 mm. Other technical features are identical to those in Example 1.

[0085] Compared with Example 1, the advantage of this embodiment is that by connecting sand core 08 to the tail ends of the air inlet pipes of the first-stage absorption tank 05, the second-stage absorption tank 06, and the third-stage absorption tank 07, the gas absorption efficiency can be increased. In the order of the first-stage absorption tank 05, the second-stage absorption tank 06, and the third-stage absorption tank 07, the filtration aperture of the sand core 08 gradually decreases, which can reduce the resistance of the system.

[0086] The method for purifying the crude iodine product using the above-mentioned device is:

[0087] S1: Add 100 mL of iodine product and 10 mL of 10 g / L sodium sulfite solution to the evaporator 03; add 2 mol / L sodium hydroxide solution to the primary absorption tank 05, the secondary absorption tank 06, and the tertiary absorption tank 07;

[0088] S2: Adjust the temperature of evaporator 03 to 95°C;

[0089] S3: Oxygen is introduced into the evaporator 03 (gas flow rate is 80 mL / min). The gas generated after reacting with the iodine product in the evaporator 03 enters the primary absorption tank 05, the secondary absorption tank 06, and the tertiary absorption tank 07 in sequence; the product generated after treatment in the absorption tank enters the product tank 09.

[0090] The crude iodine product was purified using the above device. After one hour of purification, the recovery rate of iodine-131 obtained was 99.3%, and its purity also met the requirements of medical technical indicators.

[0091] Example 5

[0092] Based on Example 4, this example provides a purification device and purification method for producing iodine-131 in a reactor using uranyl nitrate solution as fuel. The difference from Example 4 is that the pore diameter of the sand core 08 of the primary absorption tank 05 of this example is 25 μm; the pore diameter of the sand core 08 of the secondary absorption tank 06 is 0.3 mm; and the pore diameter of the sand core 08 of the tertiary absorption tank 07 is 3 mm.

[0093] The method for purifying the crude iodine product using the above-mentioned device is:

[0094] S1: Add 100 mL of iodine product and 10 mL of 10 g / L sodium sulfite solution to the evaporator 03; add 2 mol / L sodium hydroxide solution to the primary absorption tank 05, the secondary absorption tank 06, and the tertiary absorption tank 07;

[0095] S2: Adjust the temperature of evaporator 03 to 70°C;

[0096] S3: Oxygen is introduced into the evaporator 03 (gas flow rate is 80 mL / min). The gas generated after reacting with the iodine product in the evaporator 03 enters the primary absorption tank 05, the secondary absorption tank 06, and the tertiary absorption tank 07 in sequence; the product generated after treatment in the absorption tank enters the product tank 09.

[0097] The crude iodine product was purified using the above device. After one hour of purification, the recovery rate of iodine-131 obtained was 96.4%, and its purity also met the requirements of medical technical indicators.

[0098] Example 6

[0099] Based on Example 4, this example provides a purification device and purification method for producing iodine-131 in a reactor using uranyl nitrate solution as fuel. The difference from Example 4 is that the pore diameter of the sand core 08 of the primary absorption tank 05 of this example is 40 μm; the pore diameter of the sand core 08 of the secondary absorption tank 06 is 0.5 mm; and the pore diameter of the sand core 08 of the tertiary absorption tank 07 is 5 mm.

[0100] The method for purifying the crude iodine product using the above-mentioned device is:

[0101] S1: Add 100 mL of iodine product and 10 mL of 10 g / L sodium sulfite solution to the evaporator 03; add 2 mol / L sodium hydroxide solution to the primary absorption tank 05, the secondary absorption tank 06, and the tertiary absorption tank 07;

[0102] S2: Adjust the temperature of evaporator 03 to 75°C;

[0103] S3: Oxygen is introduced into the evaporator 03 (gas flow rate is 80 mL / min). The gas generated after reacting with the iodine product in the evaporator 03 enters the primary absorption tank 05, the secondary absorption tank 06, and the tertiary absorption tank 07 in sequence; the product generated after treatment in the absorption tank enters the product tank 09.

[0104] The crude iodine product was purified using the above device. After one hour of purification, the recovery rate of iodine-131 obtained was 94.5%, and its purity also met the requirements of medical technical indicators.

[0105] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A purification device for iodine-131 produced by a reactor using uranyl nitrate solution as fuel, characterized in that, it includes a gas cylinder (01), an evaporator (03), a waste liquid tank (10), a primary absorption tank (05), a secondary absorption tank (06), a tertiary absorption tank (07) and a product tank (09); The gas cylinder (01) is communicated with the evaporator (03) through an intake pipeline; a liquid addition port (04) is arranged at the top of the evaporator (03); An exhaust pipe is connected to the top of the evaporator (03), the exhaust pipe is communicated with the primary absorption tank (05), the primary absorption tank is communicated with the secondary absorption tank (06) through a pipeline, and the secondary absorption tank (06) is communicated with the tertiary absorption tank (07) through a pipeline; Liquid discharge pipelines are connected to the bottoms of the primary absorption tank (05), secondary absorption tank (06), and tertiary absorption tank (07), and the liquid discharge pipelines are all communicated with the product tank (09); The bottom of the evaporator (03) is connected to the waste liquid tank (10) through a liquid discharge pipeline.

2. The purification device for iodine-131 produced by a reactor using uranyl nitrate solution as fuel according to claim 1, characterized in that, Pneumatic valves (02) are connected to the intake pipeline, exhaust pipe, liquid discharge pipe, liquid drainage pipe and the pipelines connecting the primary absorption tank (05), secondary absorption tank (06), and tertiary absorption tank (07), and the pneumatic valves (02) are all communicatively connected to a controller.

3. The purification device for iodine-131 produced by a reactor using uranyl nitrate solution as fuel according to claim 1, characterized in that, The gas in the gas cylinder (01) is an oxidizing gas.

4. The purification device for iodine-131 produced by a reactor using uranyl nitrate solution as fuel according to claim 1, characterized in that, The outlet of the intake pipeline is immersed in the liquid level of the solution in the evaporator (03).

5. The purification device for iodine-131 produced by a reactor using uranyl nitrate solution as fuel according to claim 1, characterized in that, The temperature of the solution in the evaporator (03) is controlled at 60°C to 95°C.

6. The purification device for iodine-131 produced by a reactor using uranyl nitrate solution as fuel according to claim 1, characterized in that, The solution filled in the absorption tank is an alkaline solution.

7. The purification device for iodine-131 produced by a reactor using uranyl nitrate solution as fuel according to claim 6, characterized in that, The alkaline solution includes sodium hydroxide solution, and the concentration of the sodium hydroxide solution is 0.1 mol / L to 2.0 mol / L.

8. The purification device for iodine-131 produced by a reactor using uranyl nitrate solution as fuel according to claim 1, characterized in that, The ends of the intake pipelines of the primary absorption tank (05), secondary absorption tank (06), and tertiary absorption tank (07) are all connected with sand cores (08).

9. The purification device for iodine-131 produced by a reactor using uranyl nitrate solution as fuel according to claim 8, characterized in that, The pore size of the sand core (08) of the primary absorption cell (05) is 10 μm to 40 μm; the pore size of the sand core (08) of the secondary absorption cell (06) is 0.1 mm to 0.5 mm; the pore size of the sand core (08) of the tertiary absorption cell (07) is 1 mm to 5 mm.

10. A method for purifying iodine-131 produced by a nuclear reactor using an aqueous uranyl nitrate solution as fuel, characterized in that the iodine-131 purification device produced by the aqueous uranyl nitrate solution type reactor described in any one of claims 1 to 9 is used, and the specific method is as follows: Step 1: Add iodine products and sodium sulfite solution to the evaporator (03); add alkaline solution to the primary absorption cell (05), secondary absorption cell (06), and tertiary absorption cell (07); Step 2: Adjust the temperature of the evaporator (03) to 60 °C to 95 °C; Step 3: Introduce an oxidizing gas into the evaporator (03), and the gas generated after reacting with the iodine products in the evaporator (03) sequentially enters the primary absorption cell (05), secondary absorption cell (06), and tertiary absorption cell (07); the product generated after being treated by the absorption cell enters the product tank (09).

Images