KR20200052083A - Oxide reduction system integrated with electrorefining apparatus - Google Patents

Abstract

According to an exemplary embodiment of the present invention, an electrolytic reduction and electrolytic refining-integrated oxide treatment system comprises: a reduction device for converting radioactive metal oxides into metal conversion bodies through an electrolytic reduction process; and a refining device for separating, in the form of an electrodeposited material, uranium metal from the metal conversion bodies supplied from the reduction device through an electrolytic refining process. The refining device can supply unreduced radioactive metal oxides to the reduction device after the electrolytic refining process, and the reduction device can convert the supplied unreduced radioactive metal oxides into the metal conversion bodies through the electrolytic reduction process to resupply the same to the refining device. According to the exemplary embodiment of the present invention, the electrolytic reduction and electrolytic refining-integrated oxide treatment system recovers the uranium metal in the form of the electrodeposited material through the electrolytic reduction and electrolytic refining processes on spent fuel in oxide form and at the same time, recovers transuranic elements in ionic form to supply the same to an electrowinning process, which is a subsequent process.

Description

OXIDE REDUCTION SYSTEM INTEGRATED WITH ELECTROREFINING APPARATUS}

The present invention relates to an electrolytic reduction and electrorefining integrated oxide treatment system.

Pyroprocessing is a process to separate and recycle the element uranium, which is a useful component in spent nuclear fuel. This process consists of unit processes such as pretreatment, electrolytic reduction, electrorefining, electrorefining, and waste treatment. Among them, the electrolytic reduction process converts the spent fuel in the form of oxide that has undergone a pretreatment process into a metal form. The spent fuel after the electrolytic reduction process is completed is supplied to the electrolytic refining process. In the electrolytic refining process, uranium metal is separated from the spent fuel converted to metal into an electrodeposited form, and in this process, the element uranium is dissolved in the ionic form in the electrolyte included in the process. The element uranium dissolved in the electrolyte is recovered as a metal element uranium through a subsequent process, an electrolytic smelting process.

Existing pyroprocessing uses a basket for linkage between unit processes such as pretreatment, electrolytic reduction, and electrorefining. Since the spent fuel, which is a fuel material, is transported to the inside of each unit processing apparatus while being contained in the basket, the processing capacity of the process (1) is limited by the size of the basket. In addition, since the specifications of the device are different for each unit process, (2) when the electrolytic reduction process and the electrorefining process are linked, a basket exchange is required, and a separate basket exchange device is used. (3) When linking the electrolytic refining process with the electrolytic refining process, the salt (electrolyte) located inside the electrorefining device is required to be transferred to the electrolytic refining device, and a separate salt transfer device is used.

In the case of the existing electrolytic reduction process, liquid lithium metal is used to convert the solid raw material (used fuel) used in the form of oxide into metal. For efficient conversion of the raw material, the penetration of the liquid phase, which is the fluidized bed, into the solid phase, which is a fixed bed, is a major factor, but due to the fixation of the solid phase due to the use of the basket (the raw material is present in the basket as a fixed layer), material transfer is limited. . Therefore, in the (4) basket use method, it is difficult to increase the capacity of the electrolytic reduction process, and (5) it is difficult to expect a high reduction rate of spent fuel. When the spent fuel that has undergone the electrolytic reduction process is supplied to the electrorefining process with a mixture of unreduced oxides, (6) the unreduced oxide is settled at the bottom of the electrorefining process equipment and exists in the form of a slurry. It is very difficult to recover this slurry. In addition, the negative electrode of the conventional electrolytic refining apparatus in which (7) uranium metal is electrodeposited has a possibility that the negative electrode and the positive electrode are energized due to difficulties in electrodeposition management.

Japanese Patent Laid-Open No. 2008-134096 (“Reduction device for waste oxide atomic fuel and lithium regeneration electrolysis device”, published date: June 12, 2008)

An object of the present invention is to provide an electrolytic reduction and electrorefining integrated oxide treatment system capable of solving the above problems of the existing pyroprocessing process and process equipment.

However, the object of the present invention is not limited to this, and even if not explicitly stated, the object or effect that can be grasped from the solution means or embodiments of the subject described below will be included therein.

An electrolytic reduction and electrorefining integrated oxide treatment system according to an exemplary embodiment of the present invention includes a reduction device for converting a radioactive metal oxide into a metal convertor through an electrolytic reduction process; And a refining device for separating uranium metal into an electrodeposited form through an electrorefining process from the metal conversion body supplied from the reduction device, wherein the refining device reduces the unreduced radioactive metal oxide after the electrorefining process. It can be supplied to a device, and the reduction device can convert the supplied unreduced radioactive metal oxide into a metal conversion body through an electrolytic reduction process and re-supply it to the refining device.

According to an embodiment of the present invention, by using a basket for linking between unit processes in a pyroprocessing process, an electrolytic reduction and electrorefining integrated type that can solve the above problems of the existing pyroprocessing process and process devices An oxide treatment system can be provided.

Various and beneficial advantages and effects of the present invention are not limited to the above, and will be more readily understood in the course of describing the specific embodiments of the present invention.

1 is a schematic diagram of an electrolytic reduction and electrorefining integrated oxide processing system according to an exemplary embodiment of the present invention.
2A to 2C are schematic diagrams showing various embodiments of the second anode in the electrolytic reduction and electrorefining integrated oxide processing system of FIG. 1.
3 is a conceptual diagram illustrating a process of transferring and converting materials in the electrolytic reduction and electrorefining integrated oxide processing system of FIG. 1.

Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily implement the present invention. However, in the detailed description of a preferred embodiment of the present invention, when it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, the same reference numerals are used throughout the drawings for parts having similar functions and functions.

In addition, throughout the specification, when a part is said to be 'connected' to another part, it is not only 'directly connected', but also 'indirectly connected' with another element in between. Includes. In addition, "including" a component means that other components may be further included instead of excluding other components, unless otherwise stated.

An electrolytic reduction and electrorefining integrated oxide processing system according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 3.

1 is a schematic diagram of an electrolytic reduction and electrorefining integrated oxide processing system according to an exemplary embodiment of the present invention, and FIGS. 2A to 2C are various implementations of a second anode in the electrolytic reduction and electrorefining integrated oxide processing system of FIG. 1. It is a schematic diagram showing an example.

3 is a conceptual diagram illustrating a process of transferring and converting materials in the electrolytic reduction and electrorefining integrated oxide processing system of FIG. 1. Although the example of UO ₂ which is a representative raw material in the form of oxide is illustrated in FIG. 3, the oxidation number of uranium used as a raw material is not limited thereto, and may be a uranium element or a uranium oxide having various oxidation numbers. In addition, Figure 3 may include another major component constituting the spent fuel, uranium elements, in addition to uranium and ultrauranium elements, rare earth elements or precious metal elements that cause oxidation and reduction reactions in the electrolytic reduction and electrorefining process It can contain.

1 to 3, the electrolytic reduction and electrorefining integrated oxide treatment system 1 according to an exemplary embodiment of the present invention is a reduction device 10 for converting radioactive metal oxide into a metal convertor through an electrolytic reduction process And, it may include a refining device 20 for separating the uranium metal in the form of an electrodeposition among the components constituting the metal conversion material supplied from the reduction device 10 through the electrolytic refining process.

The reduction device 10 is injected with a radioactive metal oxide (MO), which is a raw material, and can be converted into a metal conversion body (RO) through an electrolytic reduction process. The radioactive metal oxide may include spent fuel in the form of an oxide, for example.

As shown in the figure, the reduction device 10 may include a first reactor 11. The inside of the first reactor 11 may be provided with a liquid electrolyte (EL). As the electrolyte EL, a LiCl molten salt generally used in an electrolytic reduction process or a LiCl-KCl molten salt generally used in an electrorefining process may be used. The usable electrolyte (EL) is not limited to this, and in general, CaCl ₂ , which can be used in an electrolytic reduction or electrorefining process, may be used, as well as a chloride-based salt such as LiCl, KCl, CaCl ₂ , and LiF , KF, NaF, and the like, and may include fluoride-based salts commonly used in electrolytic processes. The composition of the electrolyte EL may be composed of a single component, if necessary, or a mixture of two or more of the salts presented above. Li ₂ O may be added to the electrolyte EL configured as described above to promote the electrolytic reduction reaction, or UCl ₃ may be added to promote the electrorefining reaction.

The first reactor 11 may be made of a material having mechanical stability while being corrosion resistant in a high temperature electrolyte. For example, the first reactor 11 may be made of nickel-based superalloy such as inconel, stainless steel, tantalum metal, or ceramic, but the material of the first reactor 11 is not limited thereto.

A heating furnace (not shown) may be provided outside the first reactor 11 to maintain the electrolyte EL inside the first reactor 11 at a constant temperature. At this time, by the provided heating furnace, the electrolyte EL inside the first reactor 11 should be able to exist in a liquid state. For example, when LiCl is used as the electrolyte EL, it should be possible to heat and maintain the temperature above 614 ° C., the melting point of the electrolyte EL. For efficient process operation, multiple heating furnaces may be installed, and temperatures of each part of the first reactor 11 may be maintained differently.

The first reactor 11 may be provided with a raw material inlet 11a for injecting a radioactive metal oxide. If necessary, the electrolyte EL may be injected through the raw material inlet 11a.

The first reactor 11 may be provided with a gas outlet 11b that discharges gas generated in the course of the electrolytic reduction process to the outside. The gas generated may vary depending on the material used for the first anode 12 or the operating conditions of the process.

A first recovery unit 11c for recovering impurities after the electrolytic reduction process may be connected to the lower portion of the first reactor 11. The first recovery unit 11c may recover salt and other impurities from the electrolyte EL discharged after the process is completed. The salt and other impurities recovered here may contain elements of uranium.

As shown in the figure, the reduction device 10 may include a first anode 12 and a first cathode 13. The first anode 12 and the first cathode 13 are immersed in the electrolyte EL in the first reactor 11 and may be connected to a power supply 14 provided outside the first reactor 11. The first cathode 13 may be disposed at a lower portion relative to the height direction of the first reactor 11 and the first anode 12 may be disposed over the first cathode 13.

The first cathode 13 electrolyzes the electrolyte EL to produce lithium (Li) metal. The lithium metal produced can produce a metal conversion body (RO) by causing a reduction reaction with radioactive metal oxide (MO). Typical radioactive metal oxides, for a UO ₂ (MO) for _{example, [UO 2 + 4Li = U} + 2Li 2 O] through the reaction, the radioactive metal oxides (MO) is reduced, lithium (Li) is lithium oxide (Li ₂ O). The converted lithium oxide (Li ₂ O) is converted into oxygen gas in the first anode 12 and may be discharged outside the first reactor 11.

The first anode 12 is disposed on the first cathode 13 and can oxidize oxygen ions to produce oxygen gas. As the first anode 12, a non-consumable electrode such as platinum as a metal electrode or SrRuO ₃ as a ceramic electrode, or a consumable electrode such as carbon may be used. The material of the first anode 12 is not limited thereto, and a material used as an existing electrode material may be used. When using a non-consumable electrode, oxygen ions are formed of oxygen gas and discharged to the outside through the gas outlet 11b. When using a consumable electrode, carbon monoxide, carbon dioxide, chlorine by additional reactions according to the operating conditions Gas such as may be additionally generated.

As shown in the figure, the reduction device 10 may include a diffusion barrier 15. The diffusion barrier 15 may be disposed in a structure surrounding the first cathode 13 on top of the first cathode 13.

The diffusion barrier 15 may prevent the lithium (Li) metal produced in the first cathode 13 from diffusing into the first reactor 11. The lithium metal (liquid density: 0.512 g / cm 3, solid density: 0.534 g / cm 3) produced in the first cathode 13 is lower in density than the LiCl molten salt (liquid density: 1.55 g / cm 3), which is an electrolyte (EL). Due to this, it has a property of floating on the upper layer of the electrolyte (EL). When the lithium metal floats on the upper layer of the electrolyte EL in the first reactor 11, it is disadvantageous for the reduction reaction through contact with the radioactive metal oxide (MO).

The diffusion barrier 15 is preferably made of a shape surrounding the first cathode 13 from the top, such as an inverted cup structure, and serves to promote contact between lithium metal and radioactive metal oxide (MO). can do. More preferably, in the state in which the first cathode 13 is accommodated in the diffusion barrier layer 15, the reduction reaction is performed only within the diffusion barrier layer 15.

The refining device 20 is injected with a metal conversion body supplied from the reduction device 10, and it is possible to separate the uranium metal from the components constituting the metal conversion body RO through an electrorefining process in the form of an electrodeposited material.

As shown in the figure, the refining device 20 may include a second reactor 21. The inside of the second reactor 21 may be provided with a liquid electrolyte (EL). In a normal electrolytic refining process, LiCl-KCl eutectic salt is used as an electrolyte (EL), but in the present invention, since the second reactor 21 has a structure connected to the first reactor 11, LiCl is the same as the electrolytic reduction process. Molten salt can be used. In addition, if necessary, as in the case of the first reactor 11, the usable electrolyte EL is not limited to this, as well as chloride-based salts such as LiCl, KCl, CaCl ₂ , LiF, KF, NaF, etc. It may contain a fluoride-based salt commonly used in the electrolytic process. The composition of the electrolyte EL may be composed of a single component, if necessary, or a mixture of two or more of the salts presented above. Li ₂ O may be added to the electrolyte EL configured as described above to promote the electrolytic reduction reaction, or UCl ₃ may be added to promote the electrorefining reaction.

Like the first reactor 11, the second reactor 21 may be formed of a material having mechanical stability while being corrosion resistant in a high temperature electrolyte.

A second recovery unit 21a for recovering impurities after the electrorefining process may be connected to the lower portion of the second reactor 21. The second recovery unit 21a may recover salt and other impurities from the electrolyte EL discharged after the process is completed. The salt and other impurities recovered here may contain elements of uranium.

In addition, a heating furnace (not shown) may be provided outside the second reactor 21 to maintain the electrolyte EL inside the second reactor 21 at a constant temperature. At this time, by the provided heating furnace, the electrolyte EL inside the second reactor 21 should be able to exist in a liquid state. For efficient process operation, multiple heating furnaces may be installed, and temperatures of each part of the second reactor 21 may be maintained differently.

In addition, although not illustrated in the drawing, an injection port for injecting the electrolyte EL may be separately installed in the second reactor 21.

As shown in the drawing, the refining device 20 may include a second anode 22 and a second cathode 23. The second anode 22 and the second cathode 23 are immersed in the electrolyte EL in the second reactor 21 and may be connected to a power supply 24 provided outside the second reactor 21. The second cathode 23 may be disposed on the upper side relative to the height direction of the second reactor 21, and the second anode 22 may be disposed on the lower side of the second cathode 23.

The material constituting the second anode 22 may be metal or carbon, and unlike the first anode 12, platinum is not required. Metal in a component constituting the reducing material g of uranium metal, which accounts for the highest percentage ^{example, [U = U 3+ + 3e} -] The anodic dissolution of uranium metal takes place through the reaction. Elementary uranium also undergoes anode melting in the same way as uranium.

Since the reaction between the second anode 22 and the metal converting body RO occurs by the transfer of electrons through contact, the second anode 22 has a structure for increasing the contact area with the metal converting body RO. Can be. As shown in FIG. 2A, the second anode 22 may be formed in a coil form to increase the contact area. In addition, as shown in Figure 2b, the second anode 22 may be made in the form of a brush. In addition, as shown in Figure 2c, the second anode 22 may be formed in the form of a mesh or the like.

The second cathode 23 electrodeposits the dissolved uranium ions into a metal electrodeposition. Specifically, in the second cathode 23, uranium ions are electrodeposited in a metal form through a [U ³⁺ + 3e ⁻ = U] reaction. Uranium ions dissolved in the second anode 22 move to the second cathode 23 to form a uranium electrodeposition, but the dissolved uranium element ions are not electrodeposited and are supplied in the form of ions to the subsequent electrolytic smelting process. Can be.

The material constituting the second cathode 23 may be metal or carbon. The second cathode 23 is preferably manufactured in the form of a rod, for example, the second cathode by a method such as spontaneous desorption of uranium metal deposited along such rods or mechanical desorption by use of vibration and scraper, etc. (23).

As shown in the figure, the refining device 20 may include an electrodeposited material detachable portion 25. The electrodeposited material desorption unit 25 may be disposed under the second cathode 23 to collect and collect electrodeposited materials, for example, uranium metal, detached from the second cathode 23.

In one embodiment, the electrodeposited material desorption unit 25 may have a funnel structure opened toward the second cathode 23. The electrodeposited material desorption unit 25 may be connected to the electrodeposited material collection tube 26 extending out of the second reactor 21. When the electrodeposited collection pipe 26 is connected to the raw material inlet of the distillation apparatus, which is a subsequent process, it is possible to link the electrolytic refining process with the electrodeposited distillation process, and implement a continuous consistent process.

On the other hand, the reduction device 10 and the refining device 20 are interconnected, and the reducing device 10 supplies a metal conversion body (RO) to the refining device 20 and the unreduced radioactive metal in the refining device 20 Oxide (MO) may be supplied to the reduction device 10.

To this end, as shown in the drawing, the reduction device 10 includes a first supply unit 17 that is connected to the refining device 20 and supplies a metal conversion body RO, and the refining device 20 is reduced It may include a second supply 27 connected to the device 10 to supply the non-reduced radioactive metal oxide (MO).

The first supply part 17 extends from the bottom of the first reactor 11 to the inside of the second reactor 21, and an open end is located at the bottom of the second anode 22, and the second anode 22 is It can be arranged in a surrounding structure. In addition, the second supply part 27 extends from the bottom of the second reactor 21 to the inside of the first reactor 11, and an open end is located at the bottom of the first cathode 13, and the first cathode 13 ) And may be disposed in a structure surrounded by the diffusion barrier 15.

The first supply unit 17 and the second supply unit 27 may be connected to carrier gas injection pipes 18 and 28, respectively. The carrier gas injection pipe 18 injects a carrier gas into the first supply unit 17, and refines the metal conversion body (RO) discharged from the reduction device 10 through the carrier gas injected from the outside. Can be transported to. In addition, the carrier gas injection pipe 28 injects the carrier gas into the second supply part 27, and the unreduced radioactive metal oxide (MO) discharged from the refiner 20 through the carrier gas injected from the outside It can be transported to the reduction device (10). As the carrier gas, an inert gas such as argon may be used.

As such, the reduction device 10 and the refining device 20 may be interconnected through the first supply unit 17 and the second supply unit 27 to form an integral structure. Therefore, the spent fuel, which is a material to be treated, can be transported while being repeatedly circulated between the reduction device 10 and the refining device 20. And, as the process proceeds, the metal is converted to a metal in the form of an unreduced metal oxide (MO) in which the surface metal is removed from the metal converting body (RO), and the surface is converted to metal again (RO) After repeated use, the spent fuel particles may be continuously processed through a cooperative reaction of electrolytic reduction and electrorefining from the outside to the inside of the spent fuel particles.

That is, according to an embodiment of the present invention, the reduction device 10 supplies a metal conversion body (RO) to the refining device 20 after the electrolytic reduction process, and the refining device 20 is a metal in which the electrorefining process is performed The non-reduced radioactive metal oxide (MO) in the converter (RO) is supplied to the reduction device 10, and the reduction device 10 converts the supplied non-reduced radioactive metal oxide (MO) into the metal through an electrolytic reduction process. It is converted to a sieve (RO) and re-supplied to the refining device 20, and this process can be continuously and repeatedly performed.

Hereinafter, a process of transferring and converting materials in the electrolytic reduction and electrorefining integrated oxide processing system 1 having the above-described configuration and structure will be described.

Initial circulation

First, a radioactive metal oxide (used spent fuel) (MO), which is an object to be treated, is injected into the first reactor 11 through the raw material inlet 11a. The injected radioactive metal oxide (MO) is transported from the lower portion of the first reactor 11 to the second reactor 21 through the first supply unit 17. And, it is transported from the lower portion of the second reactor 21 to the first reactor 11 through the second supply unit 27 again.

That is, the radioactive metal oxide (MO) injected in the initial circulation is transported to the second reactor 21 directly without going through the electrolytic reduction process in the first reactor 11, and the electrolytic refining process in the second reactor 21 It is transported to the first reactor 11 again without going through.

Process circulation

The radioactive metal oxide (MO) transported to the first reactor 11 through the second supply 27 is a diffusion barrier 15 surrounding the open end of the second supply 27 together with the first cathode 13 Reduction reaction with lithium metal occurs inside. At this time, since only the surface of the radioactive metal oxide (MO) is reduced, the radioactive metal oxide (MO) is converted into a form of a mixture of a metal convertor (RO), for example, a metal reducing agent and an oxide, partially reduced along the surface.

The metal conversion body (RO) in the form of a mixture converted in the first reactor 11 is transported from the bottom of the first reactor 11 through the first supply unit 17 to the second reactor 21 again.

The metal conversion body (RO) in the form of a mixture transported to the second reactor 21 through the first supply 17 is in contact with the second anode 22 surrounded by the open end of the first supply 17. Anodic dissolution occurs in the metal portion of the metal conversion body (RO), which is partially reduced.

In the metal conversion body (RO) in the form of a mixture in which anodic dissolution has occurred, the metal part is removed, and unreduced radioactive metal oxide (MO) remains. The unreduced radioactive metal oxide (MO) is transported from the bottom of the second reactor 21 through the second supply unit 27 to the inside of the first reactor 11 again. Then, the diffusion preventing film 15 in the first reactor 11 is converted into a metal conversion body (RO) in the form of a mixture partially reduced by lithium metal.

In this process circulation, as the electrolytic reduction process and the electrorefining process are repeatedly performed in a cyclic form, the amount of radioactive metal oxide (MO) present in the first reactor 11 and the second reactor 21 decreases, and the second The amount of uranium electrodeposited to the second cathode 23 in the reactor 21 increases. In addition, the amount of elemental uranium ions dissolved in the salt also increases.

As long as the capacity of the electrodeposited desorption section (25) for collecting uranium electrodeposits and the amount of the elemental uranium ions dissolved in the salt are not a problem, the continuous process is continuously injected by injecting spent fuel through the raw material inlet (11a). It can be done.

Therefore, since the processing capacity of the process is not limited to the size of the existing basket, there is an advantage that the capacity of the process can be easily increased. In addition, since a basket is not used, high linkage between each unit process can be expected, and there is an advantage that a continuous process system can be implemented by breaking away from an existing batch process through a circulating supply method.

In addition, since basket exchange is not required, a basket exchange device is not required, and since the electrolytic reduction process and the electrorefining process are performed in one integrated device, a separate distillation device for linking the two processes is not required.

On the other hand, when the process is completed, the uranium deposits and salts can be recovered and supplied to the subsequent processes, respectively. In this case, direct salt transfer is possible by directly connecting the first recovery unit 11c and the second recovery unit 21a to an electrolytic smelting device, which is a subsequent process, so that a continuous and consistent process can be implemented. In addition, there is an advantage that a separate salt transfer device is not required.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may realize that the present invention can be implemented in other specific forms without changing its technical spirit or essential features. You will understand. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

1 ... Electrolytic reduction and electrorefining integrated oxide treatment system
10 ... reduction device
11 ... First reactor
11a ... Raw material inlet
11b ... gas outlet
11c ... 1st recovery unit
12 ... first anode
13 ... first cathode
14 ... Power supply
15 ... diffusion barrier
17 ... first supply
20 ... refiner
21 ... Second reactor
21a ... second recovery unit
22 ... second anode
23 ... second cathode
24 ... Power supply
25 ... Electrodeposition and detachment
26 ... Electrodeposit collector
27 ... Second supply
MO ... radioactive metal oxide
RO ... metal conversion body
EL ... electrolyte

Claims (8)

A reduction device for converting radioactive metal oxides into metal convertors through an electrolytic reduction process; And
A smelting device for separating uranium metal into an electrodeposited form from the metal conversion body supplied from the reduction device through an electrorefining process;
Including,
The refining device supplies unreduced radioactive metal oxide to the reduction device after an electrorefining process, and the reduction device converts the supplied unreduced radioactive metal oxide into a metal conversion body through an electrolytic reduction process to the refining device. Re-supply, electrolytic reduction and electrorefining integrated oxide treatment system.
According to claim 1,
The reduction device includes a first supply part connected to the refining device to supply the metal conversion body, and the refining device includes a second supply part connected to the reduction device to supply the unreduced radioactive metal oxide. , Electrolytic reduction and electrorefining integrated oxide treatment system.
According to claim 2,
The first supply portion and the second supply portion are respectively connected to the carrier gas injection pipe,
The carrier gas injection pipe carries the metal conversion body discharged from the reduction device to the refining device through a carrier gas injected from the outside, and the unreduced radioactive metal oxide discharged from the refining device to the reduction device Transport, electrolytic reduction and electrorefining integrated oxide treatment system.
According to claim 2,
The reduction device,
A first reactor equipped with an electrolyte;
A first anode immersed in the electrolyte, and a first anode immersed in the electrolyte at the top of the first cathode;
A power supply connected to the first cathode and the first anode; And
A diffusion barrier layer disposed in a structure surrounding the first cathode on the first cathode;
Including,
The second supply part is an electrolytic reduction and electrorefining integrated oxide, the end of which extends into the first reactor and is located under the first cathode, and is disposed in a structure surrounded by the diffusion barrier with the first cathode. Processing system.
The method of claim 4,
Connected to the lower portion of the first reactor further comprises a first recovery unit for recovering impurities or ultra-uranium elements after the electrolytic reduction process, the electrolytic reduction and electrorefining integrated oxide treatment system.
According to claim 2,
The refining device,
A second reactor equipped with an electrolyte;
A second positive electrode which is immersed in the electrolyte to positively dissolve the metal converting body including the uranium metal and superuranium elements, and a uranium ion dissolved in and immersed in the electrolyte at the top of the second positive electrode to form an electrodeposited metal A second cathode to be electrodeposited with;
A power supply connected to the second cathode and the second anode; And
An electrodeposition desorption unit disposed under the second cathode to collect the electrodeposited material detached from the second cathode;
Including,
The first supply part is an end extending into the second reactor and located under the second anode, and disposed in a structure surrounding the second anode,
Electrolytic reduction and electrorefining integrated oxide treatment system.
The method of claim 6,
The electrodeposited desorption unit has a funnel structure opened toward the second cathode, and is connected to an electrodeposite collection tube extending outside the second reactor, the electrolytic reduction and electrorefining integrated oxide treatment system.
The method of claim 6,
It is connected to the lower portion of the second reactor further comprises a second recovery unit for recovering impurities or ultrauranium elements after the electrorefining process, the electrolytic reduction and electrorefining integrated oxide treatment system.

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