Purification apparatus and method for iodine-131 produced by a reactor fueled with uranyl nitrate solution

Abstract

This invention discloses a purification apparatus and method for iodine-131 produced by a nuclear reactor using uranyl nitrate aqueous solution as fuel, relating to the field of radioactive isotope production technology. The apparatus includes a carrier gas cylinder, an evaporator, a waste liquid tank, a primary absorption tank, a secondary absorption tank, a tertiary absorption tank, and a product tank. The carrier gas cylinder is connected to the evaporator via an inlet pipe. A liquid inlet is located at the top of the evaporator. An outlet pipe is connected to the top of the evaporator, connecting to the primary absorption tank. The primary absorption tank is connected to the secondary absorption tank via a pipe, and the secondary absorption tank is connected to the tertiary absorption tank via a pipe. Discharge pipes are connected to the bottom of the primary, secondary, and tertiary absorption tanks, and these pipes are all connected to the product tank. The bottom of the evaporator is connected to the waste liquid tank via a drain pipe. This apparatus and method achieve high product recovery and high product purity after iodine-131 purification. 131 The sodium hydroxide solution product meets the requirements of medical technical specifications.

Description

Technical Field

[0001] This invention relates to the field of radioactive isotope production and purification technology, specifically to an apparatus and method for producing and purifying iodine-131 using a reactor fueled by uranyl nitrate solution. Background Technology

[0002] Iodine-131 is an important medical radionuclide and the earliest and most widely used therapeutic radionuclide in nuclear medicine. Iodine-131 is a globally recognized effective treatment for hyperthyroidism and thyroid cancer. In addition, in recent years, the use of iodine-131-labeled monoclonal antibodies for tumor treatment has further promoted the application of iodine-131. As a result, the market demand for iodine-131 has gradually increased.

[0003] Iodine-131 is usually produced using neutron activation or... 235 While iodine-131 can be produced using Uranium fission targets, both of these methods are small-scale, generate significant amounts of radioactive waste, and have high production costs. Producing iodine-131 using a homogeneous nuclear reactor fueled by uranyl nitrate solution allows for large-scale production. This method produces less waste, is less expensive, and has significant potential for widespread adoption.

[0004] Uranyl nitrate solution is a homogeneous aqueous solution of nuclear fuel. During nuclear reactor operation, a large amount of fission products are generated. The valence state of iodine, a fission product, in acidic solutions is complex. In publicly available literature on the extraction and separation of Mo and I from solution-fed reactors, the fuel solution is typically passed through an alumina column and a Mo / I separation column to obtain iodine-131. However, alumina and Mo / I separation column materials shed to varying degrees during the iodine-131 process, resulting in high levels of aluminum and other impurities. Therefore, current processing equipment still suffers from low purity and low recovery rate of the processed iodine-131. Iodine-131 requires further purification to obtain iodine that meets medical technical requirements. 131 I] Sodium hydroxide solution product. Summary of the Invention

[0005] The technical problem this invention aims to solve is that current processing devices still suffer from low purity and low recovery rate of the processed iodine-131 product. The objective is to provide an iodine-131 purification apparatus and method using a reactor fueled by uranyl nitrate solution. This apparatus and method achieve high product recovery and high purity after iodine-131 purification. The apparatus can be operated within a hot chamber or shielded enclosure, reducing personnel radiation exposure. It can effectively purify iodine-131 nuclide, producing iodine that meets medical technical requirements. 131 I] Sodium hydroxide solution product.

[0006] This invention is achieved through the following technical solution:

[0007] In the first aspect, the apparatus and method for producing iodine-131 using uranyl nitrate solution as fuel provided in this application include a carrier gas cylinder, an evaporator, a waste liquid tank, a primary absorption tank, a secondary absorption tank, a tertiary absorption tank, and a product tank.

[0008] The carrier gas cylinder is connected to the evaporator via an inlet pipe; the evaporator is equipped with a liquid inlet at the top.

[0009] The top of the evaporator is connected to an exhaust pipe, which is connected to the primary absorption tank. The primary absorption tank is connected to the secondary absorption tank via a pipe, and the secondary absorption tank is connected to the tertiary absorption tank via a pipe.

[0010] The bottom of each of the primary absorption tank, secondary absorption tank, and tertiary absorption tank is connected to an outlet pipe, and the outlet pipe is connected to the product tank.

[0011] The bottom of the evaporator is connected to a waste liquid tank via a drain pipe.

[0012] When using this device to process crude iodine, after treatment in the primary, secondary, and tertiary absorption tanks, the corresponding pneumatic valves are opened, allowing the absorbent solutions in these tanks to flow into the product tank under their own 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 tanks can be combined into a single pipe connected to the sample tank, thus reducing the number of pipes required.

[0013] The iodine-131 purification device produced by the reactor using uranyl nitrate solution as fuel in this invention achieves a high iodine product recovery rate of over 95% after iodine-131 purification, and the purity of the iodine product is also very high. This device can effectively purify iodine-131 nuclide and produce iodine that meets medical technical requirements. 131 The device is designed to produce sodium hydroxide solution and can also be operated in a heated chamber or a shielded box, reducing the radiation dose to workers and making operation in both chambers convenient.

[0014] Furthermore, pneumatic valves are connected to the air inlet pipe, air outlet pipe, liquid outlet pipe, liquid discharge pipe, and the pipes connecting the primary absorption tank, secondary absorption tank, and tertiary absorption tank, and the pneumatic valves are all communicatively connected to the controller.

[0015] This invention facilitates control of each step in the purification process by connecting pneumatic valves to all pipelines. Furthermore, by connecting the pneumatic valves to the controller, the device can achieve automated control.

[0016] All the pipes are made of materials that do not react with iodine, such as quartz glass and polytetrafluoroethylene.

[0017] Furthermore, the gas in the carrier gas cylinder is an oxidizing gas.

[0018] The oxidizing gases contained in the carrier gas cylinders include oxygen, ozone, and other oxidizing gases.

[0019] Furthermore, the outlet of the air inlet pipe is immersed in the solution surface inside the evaporator.

[0020] This invention directs the gas outlet of the inlet pipe into the solution surface of the evaporator, so that the introduced gas can simultaneously agitate the solution and accelerate the gas carrying effect.

[0021] The gas flow rate is 20 mL / min to 80 mL / min.

[0022] Furthermore, the solution temperature inside the evaporator is controlled at 60℃~95℃.

[0023] The evaporator has a heating function and can be heated electromagnetically, enabling remote operation of the heating chamber and controlling the temperature inside the evaporator between 60℃ and 95℃.

[0024] Furthermore, the solution contained in the absorption tank is an alkaline solution.

[0025] Furthermore, the alkaline solution includes a sodium hydroxide solution with a concentration of 0.1 mol / L to 2.0 mol / L.

[0026] Furthermore, the inlet pipes of the primary absorption tank, the secondary absorption tank, and the tertiary absorption tank are all connected to sand cores at their tail ends.

[0027] Furthermore, the pore size of the sand core in the primary absorption cell is 10μm~40μm; the pore size of the sand core in the secondary absorption cell is 0.1mm~0.5mm; and the pore size of the sand core in the tertiary absorption cell is 1mm~5mm.

[0028] This application increases gas absorption efficiency by connecting sand cores to the tail ends of the air inlet pipes of the primary absorption tank, secondary absorption tank, and tertiary absorption tank. The filter pore size of the sand cores gradually decreases in the order of primary absorption tank, secondary absorption tank, and tertiary absorption tank, which can reduce system resistance.

[0029] Secondly, the purification method for producing iodine-131 using a reactor fueled by uranyl nitrate solution provided in this application employs the aforementioned purification apparatus for producing iodine-131 using a reactor fueled by uranyl nitrate solution. The specific method is as follows:

[0030] Step 1: Add iodine product and sodium sulfite solution to the evaporator; add alkaline solution to the primary absorption tank, secondary absorption tank, and tertiary absorption tank;

[0031] Step 2: Adjust the evaporator temperature to 60℃~95℃;

[0032] Step 3: An oxidizing gas is introduced into the evaporator. After reacting with the iodine product in the evaporator, the resulting gas enters the primary absorption tank, the secondary absorption tank, and the tertiary absorption tank in sequence. The product generated after being treated in the absorption tank enters the product tank.

[0033] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0034] (1) The iodine-131 purification device produced by the reactor using uranyl nitrate solution as fuel in this invention has a high iodine product recovery rate after iodine-131 purification, which is over 95%, and the purity of the iodine product is also very high. It can effectively purify iodine-131 nuclide and produce iodine that meets the requirements of medical technical indicators. 131 The device can also be operated in a hot chamber or a shielded box, reducing the radiation dose to workers and making it convenient to operate in both.

[0035] (2) By connecting pneumatic valves to all pipelines, the present invention facilitates the control of each step in the purification process. At the same time, by connecting the pneumatic valves to the controller, the device can realize the function of automated control.

[0036] (3) In this invention, the outlet of the air inlet pipe enters the solution surface of the evaporator, so that the gas introduced can also stir the solution and accelerate the gas carrying effect.

[0037] (4) By connecting sand cores to 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 absorption efficiency of the gas can be increased. The filter pore size 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.

[0038] (5) The purification method of iodine-131 produced by the reactor using uranyl nitrate solution as fuel in this invention is simple to operate, and the iodine product obtained has high purity and high recovery rate. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0040] Figure 1 This is a schematic diagram of the iodine-131 purification device produced by a reactor using uranyl nitrate solution as fuel in this invention.

[0041] The attached diagram shows the markings and corresponding component names:

[0042] 01-Carrier gas cylinder, 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 Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0044] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other embodiments, well-known materials or methods have not been specifically described in order to avoid obscuring the invention.

[0045] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0046] In the description of this invention, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0047] Therefore, the following detailed description of embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0048] Example 1

[0049] like Figure 1 As shown, this embodiment provides a purification device and method for producing iodine-131 using uranyl nitrate solution as fuel in a reactor. The device includes a carrier 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.

[0050] The carrier gas cylinder 01 is connected to the evaporator 03 through an inlet pipe; the evaporator 03 is equipped with a liquid inlet 04 at the top.

[0051] The top of the evaporator 03 is connected to an exhaust pipe, 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 bottom 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 evaporator 03 is connected to waste liquid tank 10 via a drain pipe.

[0054] When using this device to process crude iodine, after treatment in the primary absorption tank 05, secondary absorption tank 06, and tertiary absorption tank 07, the corresponding pneumatic valve 02 is opened. This allows the absorbent liquid in the primary, secondary, and tertiary absorption tanks 05, 06, and 07 to flow into the product tank 09 by gravity, reducing contact between pumps and other equipment and the radioactive solution, thus increasing the system's reliability. Simultaneously, the pipes connecting the primary, secondary, and tertiary absorption tanks 05, 06, and 07 can be combined into a single pipe connected to the sample tank, further reducing the number of pipes required.

[0055] The method for purifying crude iodine using the above-mentioned apparatus is as follows:

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

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

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

[0059] The crude iodine was purified using the above-mentioned device. After 1 hour of purification, the recovery rate of iodine-131 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 by a nuclear reactor using uranyl nitrate solution as fuel. Unlike Example 1, the temperature in the evaporator in this comparative example is set at 55°C. Other technical features are exactly the same as in Example 1.

[0062] After purifying for 1 hour using the comparative method, 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 producing iodine-131 using a reactor fueled by uranyl nitrate solution. Unlike Example 1, the temperature in the evaporator in this comparative example is set to 100°C, while other technical features are exactly the same as in Example 1.

[0065] Using this comparative technical solution, after 1 hour of purification, the recovery rate of iodine-131 was 94.5%, but the iodine-131 product had a high impurity content 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 producing iodine-131 using uranyl nitrate solution as fuel in a reactor. Unlike Example 1, this example includes pneumatic valves 02 connected to the inlet pipe, outlet pipe, liquid outlet pipe, drain pipe, and the pipes connecting the primary absorption tank 05, secondary absorption tank 06, and tertiary absorption tank 07. All pneumatic valves 02 are communicatively connected to a controller. Other technical features are identical to those in Example 1.

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

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

[0070] The method for purifying crude iodine using the above-mentioned apparatus is as follows:

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

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

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

[0074] The crude iodine was purified using the above-mentioned device. After 1 hour of purification, the recovery rate of iodine-131 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 using uranyl nitrate solution as fuel in a reactor. The difference from Example 1 is that the outlet of the inlet pipe in this example is immersed in the solution surface within the evaporator 03. Other technical features are identical to those of Example 1.

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

[0078] The method for purifying crude iodine using the above-mentioned apparatus is as follows:

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

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

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

[0082] The crude iodine was purified using the above-mentioned device. After 1 hour of purification, the recovery rate of iodine-131 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 producing iodine-131 using uranyl nitrate solution as fuel in a reactor. Unlike Example 1, in this example, the inlet pipes of the primary absorption tank 05, secondary absorption tank 06, and tertiary absorption tank 07 are all connected to sand cores 08. The pore size of the sand core 08 in the primary absorption tank 05 is 10 μm; the pore size of the sand core 08 in the secondary absorption tank 06 is 0.1 mm; and the pore size of the sand core 08 in the tertiary absorption tank 07 is 1 mm. Other technical features are identical to those in Example 1.

[0085] Compared with Example 1, the advantage of this example is that by connecting sand cores 08 to the tail ends of the air inlet pipes of the primary absorption tank 05, the secondary absorption tank 06, and the tertiary absorption tank 07, the gas absorption efficiency can be increased. In the order of primary absorption tank 05, secondary absorption tank 06, and tertiary absorption tank 07, the filter pore size of the sand cores 08 gradually decreases, which can reduce the resistance of the system.

[0086] The method for purifying crude iodine using the above-mentioned apparatus is as follows:

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

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

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

[0090] The crude iodine was purified using the above-mentioned device. After 1 hour of purification, the recovery rate of iodine-131 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 apparatus and method for producing iodine-131 in a reactor using uranyl nitrate solution as fuel. Unlike Example 4, the pore size of the sand core 08 in the primary absorption cell 05 is 25 μm; the pore size of the sand core 08 in the secondary absorption cell 06 is 0.3 mm; and the pore size of the sand core 08 in the tertiary absorption cell 07 is 3 mm.

[0093] The method for purifying crude iodine using the above-mentioned apparatus is as follows:

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

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

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

[0097] The crude iodine was purified using the above-mentioned device. After 1 hour of purification, the recovery rate of iodine-131 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 apparatus and method for producing iodine-131 in a reactor using uranyl nitrate solution as fuel. Unlike Example 4, the pore size of the sand core 08 in the primary absorption cell 05 of this example is 40 μm; the pore size of the sand core 08 in the secondary absorption cell 06 is 0.5 mm; and the pore size of the sand core 08 in the tertiary absorption cell 07 is 5 mm.

[0100] The method for purifying crude iodine using the above-mentioned apparatus is as follows:

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

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

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

[0104] The crude iodine was purified using the above-mentioned device. After 1 hour of purification, the recovery rate of iodine-131 was 94.5%, and its purity also met the requirements of medical technical indicators.

[0105] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment 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 within the scope of protection of the present invention.

Claims

1. A reactor for producing iodine-131 purification using uranyl nitrate solution as fuel, characterized in that, It includes a carrier 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 carrier gas cylinder (01) is connected to the evaporator (03) through an air inlet pipe; the top of the evaporator (03) is provided with a liquid inlet (04); The evaporator (03) is connected to an exhaust pipe at the top, 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. The bottom of the primary absorption tank (05), the secondary absorption tank (06), and the tertiary absorption tank (07) are all connected to liquid outlet pipes, and the liquid outlet pipes are all connected to the product tank (09). The bottom of the evaporator (03) is connected to the waste liquid tank (10) through a drain pipe; The gas in the carrier gas cylinder (01) is an oxidizing gas; The solution temperature inside the evaporator (03) is controlled at 60℃~95℃; The inlet pipes of the primary absorption tank (05), secondary absorption tank (06), and tertiary absorption tank (07) are all connected to sand cores (08); the pore size of the sand core (08) of the primary absorption tank (05) is 10μm~40μm; the pore size of the sand core (08) of the secondary absorption tank (06) is 0.1mm~0.5mm; and the pore size of the sand core (08) of the tertiary absorption tank (07) is 1mm~5mm.

2. The iodine-131 purification apparatus for reactor production using uranyl nitrate solution as fuel according to claim 1, characterized in that, Pneumatic valves (02) are connected to the inlet pipe, outlet pipe, liquid outlet pipe, drain pipe and the pipes connecting the primary absorption tank (05), secondary absorption tank (06) and tertiary absorption tank (07), and the pneumatic valves (02) are all connected to the controller.

3. The iodine-131 purification apparatus for reactor production using uranyl nitrate solution as fuel according to claim 1, characterized in that, The outlet of the air inlet pipe is immersed in the solution surface inside the evaporator (03).

4. The iodine-131 purification apparatus for reactor production using uranyl nitrate solution as fuel according to claim 1, characterized in that, The solution contained in the absorption tank is an alkaline solution.

5. The iodine-131 purification apparatus for reactor production using uranyl nitrate solution as fuel according to claim 4, characterized in that, The alkaline solution includes a sodium hydroxide solution with a concentration of 0.1 mol / L to 2.0 mol / L.

6. A purification method for producing iodine-131 from a reactor using uranyl nitrate solution as fuel, characterized in that, The iodine-131 purification device produced using a reactor fueled by uranyl nitrate solution as described in any one of claims 1 to 5 is as follows: Step 1: Add iodine product and sodium sulfite solution to evaporator (03); add alkaline solution to primary absorption tank (05), secondary absorption tank (06) and tertiary absorption tank (07); Step 2: Adjust the temperature of the evaporator (03) to 60℃~95℃; Step 3: An oxidizing gas is introduced into the evaporator (03). After reacting with the iodine product in the evaporator (03), the gas produced enters the primary absorption tank (05), the secondary absorption tank (06), and the tertiary absorption tank (07) in sequence. The product generated after being processed in the absorption tank enters the product tank (09).

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