KR101726669B1 - Assembly type anode module for electrochemical reduction process - Google Patents

Assembly type anode module for electrochemical reduction process Download PDF

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Publication number
KR101726669B1
KR101726669B1 KR1020160057533A KR20160057533A KR101726669B1 KR 101726669 B1 KR101726669 B1 KR 101726669B1 KR 1020160057533 A KR1020160057533 A KR 1020160057533A KR 20160057533 A KR20160057533 A KR 20160057533A KR 101726669 B1 KR101726669 B1 KR 101726669B1
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KR
South Korea
Prior art keywords
shroud
positive electrode
anode
reduction process
electrolytic reduction
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Application number
KR1020160057533A
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Korean (ko)
Inventor
김성욱
홍순석
최은영
허진목
Original Assignee
한국원자력연구원
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Priority to KR1020160057533A priority Critical patent/KR101726669B1/en
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/34—Electrolytic production, recovery or refining of metals by electrolysis of melts of metals not provided for in groups C25C3/02 - C25C3/32
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
    • C25C7/005—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells of cells for the electrolysis of melts
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
    • C25C7/02—Electrodes; Connections thereof
    • C25C7/025—Electrodes; Connections thereof used in cells for the electrolysis of melts

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Abstract

The present invention relates to an assembled positive electrode module for an electrolytic reduction process, and more particularly, to a positive electrode module capable of easily replacing a damaged shroud by a reaction gas generated from an anode in an electrolytic reduction process of pyroprocessing . The present invention relates to a positive electrode module for use in an electrolytic reduction process of pyroprocessing using a molten salt, the positive electrode module comprising a positive electrode immersed in the molten salt, a positive electrode conductor disposed above the positive electrode, And includes a plurality of shrouds in which the positive electrode conductors are received and the longitudes are coupled or released along the directions.

Description

TECHNICAL FIELD [0001] The present invention relates to a positive electrode module for an electrolytic reduction process,

The present invention relates to an assembled positive electrode module for an electrolytic reduction process, and more particularly, to a positive electrode module capable of easily replacing a damaged shroud by a reaction gas generated from an anode in an electrolytic reduction process of pyroprocessing .

The electrolytic reduction process using molten salt is applied to the metal conversion process of various metal oxides (TiO 2 , Ta 2 O 5 , UO 2, etc.).

In particular, in the field of nuclear power, the electrolytic reduction process is an essential process for pyroprocessing, which is the recycling process of spent nuclear fuel. It plays a role of replacing the oxide fuel used in the light water reactor with the metal fuel type that can be used in the sodium cooling high-speed furnace do.

The spent fuel electrolytic reduction process used in pyro processing is carried out using a LiCl-based molten salt accommodated in the reactor, a metal basket cathode containing spent fuel particles, and an anode.

Here, the molten salt also includes a LiCl-based molten salt not containing Li 2 O, and the anode includes other materials such as carbon besides Pt.

When an electric signal is applied between the electrodes immersed in the molten salt, Li + ion loses electrons and is reduced to metal Li at the cathode, and O 2- or Cl - ions emit electrons at the cathode and oxygen (O 2 ) or A reactive gas such as chlorine (Cl 2 ) gas is produced.

At this time, the metal Li produced in the cathode reduces the oxide fuel (main component UO 2 ) contained in the basket into a metal form.

The metal conversion product obtained through the electrolytic reduction process of the spent nuclear fuel is recovered through a subsequent process and processed into a metal fuel form.

As described above, in the electrolytic reduction process, the salt must be maintained in a liquid state. Therefore, the reactor must be maintained at a temperature higher than the melting point of the salt, and the above-mentioned LiCl-based molten salt requires a temperature of about 650 ° C.

And a highly corrosive atmosphere can be formed in the reactor by the reaction gas generated at the high process temperature and the anode.

Therefore, if the reactive gas can not be effectively discharged to the outside of the reactor, the whole of the reactor may be corroded.

In order to prevent such a problem, a cathode module for an electrolytic reduction process in which a shroud, which is a structure surrounding an anode, is installed to prevent diffusion of a reaction gas, and a shroud is connected to an exhaust system to efficiently discharge the reaction gas to the outside of the reactor .

However, the conventional anode module for electrolytic reduction process can prevent corrosion of the entire reactor, but since the inside of the shroud is continuously exposed to the high-temperature reaction gas, replacement of the shroud where oxidation and corrosion damage are caused is essential.

Since the electrolytic reduction process is carried out in an argon cell (Ar Cell) in which water and oxygen are removed, the middle and large apparatuses necessary for commercial operation can not be accessed. Therefore, replacement of the damaged shroud is performed using a remotely manipulable manipulator.

Since the remote operation is limited in the degree of freedom of operation, it is difficult to assemble and disassemble a complicated structure. Therefore, the conventional anode module for the electrolytic reduction process is formed as an integrated type in which the anode and the shroud are combined.

Since the shroud, which is made in one piece with the anode, can not be replaced separately, the entire anode module must be discharged outside the Ar Cell. When the discharged anode module comes in contact with the external moisture, the surface of the shroud and anode There is a problem that the salt component deposited on the shroud and the anode accelerates the damage of the shroud and the anode.

Therefore, there is a need for a cathode module for an electrolytic reduction process in which an easily damaged shroud can be easily and separately replaced within an argon cell through remote operation.

Korean Patent No. 1437763

In order to solve the above problems, an object of the present invention is to provide a positive electrode module capable of easily replacing a damaged shroud by a reaction gas generated from an anode in an electrolytic reduction process of pyroprocessing.

In order to achieve the above object, the present invention provides a bipolar module for use in an apparatus for electrolytic reduction of pyroprocessing using a molten salt, the bipolar module comprising: a positive electrode immersed in the molten salt; And a plurality of shrouds accommodating the positive electrode and the positive electrode conductor therein, wherein the plurality of shrouds are mutually coupled or released along the longitudinal direction of the shroud, and the plurality of shrouds are generated from the plurality of shrouds It is preferable that at least any one of the shrouds damaged and oxidized and corroded by the reaction gas is replaceable.

The assembled anode module for the electrolytic reduction process apparatus according to the present invention can be replaced or shrouded with a plurality of shrouds by mutual coupling or disassembling to separately replace the oxidized and corroded shrouds, thereby facilitating the maintenance and cost reduction of the electrolytic reduction processing apparatus .

Further, coupling and disengagement between a plurality of shrouds is simple and remote manipulation by a manipulator is possible.

1A is a perspective view of an assembled positive electrode module 1000 for an electrolytic reduction process according to the first embodiment of the present invention.
1B is a perspective view of the positive electrode 1100 and the positive electrode conductor 1200 shown in FIG. 1A.
FIG. 2A is a plan view of the assembled anode module 1000 for the electrolytic reduction process shown in FIG. 1A.
FIG. 2B is a side view of the assembled anode module 1000 for the electrolytic reduction process shown in FIG. 1A.
FIG. 3 is an enlarged view of a portion 'A' shown in FIG. 1A.
FIG. 4A is a view illustrating a state in which the lower shroud 1320 is coupled to the upper shroud 1310 shown in FIG. 1A.
FIG. 4B is a diagram illustrating a state in which the lower shroud 1320 is released from the upper shroud 1310 shown in FIG. 1A.
5 is a plan view of an assembled positive electrode module 1000 for an electrolytic reduction process according to a second embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to facilitate the understanding of the technical idea of the present invention, a most preferred embodiment of the present invention will be described with reference to the accompanying drawings.

In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In the direction described in the following description of the present invention, the upper part of the "upper" is the direction toward the positive electrode conductor 1200 side relative to the positive electrode 1100 shown in FIG. 1A, Quot; is defined as a direction toward the anode 1100 side with reference to the anode conductor 1200. [

Hereinafter, an assembled positive electrode module 1000 for an electrolytic reduction process according to a first embodiment of the present invention will be described with reference to FIGS. 1A to 3. FIG.

FIG. 1A is a perspective view of an assembled positive electrode module 1000 for an electrolytic reduction process according to the first embodiment of the present invention, and FIG. 1B is a perspective view of the positive electrode 1100 and the positive electrode conductor 1200 shown in FIG. 1A.

 1A and 1B, an assembled anode module for an electrolytic reduction process (hereinafter referred to as 'anode module') 1000 includes an anode 1100, a cathode conductor 1200, and a shroud 1300.

The anode 1100 is immersed in a molten salt contained in the reactor, for example, a LiCl molten salt bath to produce a reaction gas such as oxygen or chlorine gas.

The positive electrode conductor 1200 is disposed above the positive electrode 1100 and more specifically the upper portion of the positive electrode 1100 is physically and electrically connected to the positive electrode conductor 1200.

The upper portion of the positive electrode conductor 1200 is installed under the insulator 1400 provided with the anode connection rod 1410 and the open top surface of the upper shroud 1310 described later is closed by the insulator 1400.

The shroud 1300 has a top surface and a bottom surface, and the anode 1100 and the anode conductor 1200 are accommodated in the shroud 1300, and the shroud 1300 is coupled or released along the direction.

More specifically, the shroud 1300 includes an upper shroud 1310 in which the cathode conductor 1200 is disposed, a lower shroud 1310 in which the anode 1100 is disposed and is coupled to or released from the upper shroud 1310, (1320).

The upper shroud 1310 includes a discharge portion 1311 having a gas discharge portion 1311b formed on one side thereof and a discharge portion 1311 connected to the lower portion of the discharge portion 1311 downwardly and coupled to the lower shroud 1320 And a fastening portion 1312.

The gas discharge portion 1311a is formed in the discharging portion 1311 and a reactive gas generated from the anode 1100 and flowing along the inside of the shroud 1300 is discharged to the gas discharge portion 1311b And stays in the gas reservoir 1311a until it goes outside.

The discharge part 1311 has a slope part 1311c formed on one side or both sides of the discharge part 1311b protruding outward so that the discharge part 1311b discharges to the outside through the discharge part 1311b The effect of reducing the flow resistance of the gas can be obtained.

The lower shroud 1320 has an inlet 1321 with a lower surface opened and a porous mesh 1322 at a lower portion thereof.

The molten salt flows into the lower shroud 1320 through the inlet 1321 and the porous mesh 1322 allows movement of negative ions not only at the lower end of the lower shroud 1320 but also at the side of the lower shroud 1320, Thereby improving the density.

The lower portion of the lower shroud 1320 is not limited to the porous mesh 1322 but may be formed in a plate shape Can be implemented.

2A is a plan view of the anode module 1000 shown in FIG. 1A, FIG. 2B is a side view of the anode module 1000 shown in FIG. 1A, and FIG. 3 is an enlarged view of the portion 'A' .

Referring to FIGS. 2A and 2B, the upper shroud 1310, more specifically, the one side or both sides of the coupling portion 1312, is rotatably provided with a bracket 1500 on the outer side.

The hinge 1600 is fixed to or separated from the bracket 1500. The hinge 1600 is rotatably installed on one side or both sides of the lower shroud 1320. [

3, the hinge 1600 is formed with a penetration portion 1620 corresponding to the shape of the latch 1500. One end of the hinge 1600 is connected to a hinge portion 1610 provided on the lower shroud 1320 have.

A hook 1630 is formed on the hinge 1600 so as to restrain the rotation of the latch 1500 so that the latch 1500 can be easily inserted into or drawn out of the penetration part 1620.

The hinge 1600 may be mounted on the upper shroud 1310 and the lower shroud 1320 may be mounted on the upper shroud 1310. In this case, Lt; / RTI >

FIG. 4A is a view illustrating a state in which the lower shroud 1320 is coupled to the upper shroud 1310 shown in FIG. 1A, FIG. 4B is a view illustrating a state in which the lower shroud 1320 is attached to the upper shroud 1310 shown in FIG. ) Is released.

As described above, the shroud 1300 is remotely engaged or disengaged by a manipulator.

4A, when the upper shroud 1310 and the lower shroud 1320 are engaged with each other, the pendulum 1500 is rotated by the manipulator to a position corresponding to the piercing portion 1620 (shown in FIG. 3) When the hinge 1600 is pivoted downward, the latch 1500 is pulled out from the hinge 1600 and separated.

4B, the lower shroud 1320 is formed with a step 1331 at the upper end thereof to which the lower end of the upper shroud 1310 is closely attached to the upper shroud 1320, An expansion portion 1330 surrounding the lower portion of the shroud 1310 is formed.

The upper shroud 1310 and the lower shroud 1320 can be more firmly coupled with each other by forming the extension portion 1330 and the step 1331. When the reaction gas is passed through the gas exhaust portion 1311b To the outside.

The upper shroud 1310 is separated from the upper shroud 1310 by being separated from the step 1331 and the extension 1330 after the hinge 1600 is separated from the brace 1500. [ Is released.

The process of joining the new lower shroud 1320 to replace the released lower shroud 1320 is the reverse sequence from FIG. 4B to FIG. 4A.

That is, when the hinge 1600 is turned upward after the upper shroud 1310 is brought into close contact with the step 1331 of the new lower shroud 1320 to replace the released lower shroud 1320, The latch 1500 is inserted into the latch 1620 (shown in FIG. 3).

When the latch 1500 is rotated, the latch 1500 is fixed to the hinge 1600 so that the lower shroud 1320 is engaged with the upper shroud 1310.

Hereinafter, the anode module 1000 according to the second embodiment of the present invention will be described with reference to FIG. 5, and a detailed description of the configuration overlapping with the first embodiment will be omitted.

5 is a plan view of the cathode module 1000 according to the second embodiment of the present invention.

At least one connecting shroud 1340 is disposed between the upper shroud 1310 and the lower shroud 1320 so that the anode module 1000 ) Can be implemented in multiple stages.

Referring to FIG. 5, for example, one of the connection shrouds 1340 is disposed between the upper shroud 1310 and the lower shroud 1320.

The connecting shroud 1340 has the step 1331 formed at an upper end thereof and the extended portion 1330 is provided at an upper portion of the connecting shroud 1340. The hinge 1600 is formed on one side or both sides of the extending portion 1330 Is installed.

The connection shroud 1340 has the latch 1500 fixed to the hinge 1600 on one side or both sides of the lower side.

The hinge 1600 is installed on the upper portion of the connection shroud 1340 and the hinge 1600 is installed on the upper shroud 1310. However, The latch 1500 may be installed on the connecting shroud 1340 if the latch 1600 is installed.

That is, the hinges 1600 and the latches 1500 may be installed on the upper and lower portions of the upper shroud 1310, the connection shroud 1340, and the lower shroud 1320, respectively.

A plurality of the connection shrouds 1340 are disposed between the upper shroud 1310 and the lower shroud 1320 so that the shroud 1300 requiring replacement may be more specifically divided according to the degree of oxidation and corrosion .

As described above, the bipolar module 1000 according to various embodiments of the present invention includes a plurality of shrouds 1300, which are coupled to or released from each other to thereby generate a plurality of shrouds 1300, At least any one of the shrouds damaged and oxidized and corroded by the reactive gas can be separately replaced, thereby facilitating the maintenance and cost reduction of the electrolytic reduction processing apparatus.

In addition, coupling and disengagement between the plurality of shrouds 1300 are simple and remote operation by a manipulator is possible.

As described above, an optimal embodiment has been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

1000: Assembly type anode module for electrolytic reduction process
1100: positive electrode 1200: positive electrode conductor
1300: shroud 1310: upper shroud
1320: Lower shroud 1340: Connection shroud
1400: Insulator 1500: Brace
1600: HINGE

Claims (5)

A positive electrode module for use in an electrolytic reduction process of pyroprocessing using molten salt,
A positive electrode immersed in the molten salt;
A positive electrode conductor provided on an upper portion of the positive electrode; And
A plurality of shrouds in which the positive electrode and the positive electrode conductor are accommodated;
Lt; / RTI >
Wherein the plurality of shrouds are mutually coupled or released along the longitudinal direction of the shroud so that at least one of the plurality of shrouds is damaged by oxidation and corrosion caused by the reaction gas generated from the anode, Assembled anode module for electrolytic reduction process.
The method according to claim 1,
The shroud
An upper shroud in which the positive electrode conductor is disposed; And
A lower shroud in which the anode is disposed and coupled to or released from the upper shroud;
Wherein the anode and the cathode are made of a metal.
3. The method of claim 2,
The upper shroud
A discharging portion having a gas discharging portion on one side thereof; And
A lower portion connected to a lower portion of the discharge portion and coupled to the lower shroud at a lower portion thereof;
Wherein the anode and the cathode are made of a metal.
3. The method of claim 2,
The upper shroud and the lower shroud
The one side or both sides of which are provided with the latches on the outside,
And the other one of the hinges is fixed to or separated from the one side or both sides of the latch.
The method according to claim 1,
The shroud
An upper shroud in which the positive electrode conductor is disposed;
A lower shroud in which the anode is disposed;
At least one connection shroud joined or released between the upper shroud and the lower shroud;
Wherein the anode and the cathode are made of a metal.
KR1020160057533A 2016-05-11 2016-05-11 Assembly type anode module for electrochemical reduction process KR101726669B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190060110A (en) * 2017-11-24 2019-06-03 충남대학교산학협력단 The High Corrosion Resistance Structure and System of Oxygen Separating Electrode By Using Solid Oxide Membrane

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110131605A (en) * 2010-05-31 2011-12-07 한국원자력연구원 Electrolytic reduction equipment and method, with metal anode shrouds
KR20140102400A (en) * 2013-02-14 2014-08-22 한국원자력연구원 Porous metal shroud system for anode of electrolytic reduction apparatus
KR101436240B1 (en) * 2013-02-26 2014-08-29 한국원자력연구원 integral anode for electrolytic reduction

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110131605A (en) * 2010-05-31 2011-12-07 한국원자력연구원 Electrolytic reduction equipment and method, with metal anode shrouds
KR20140102400A (en) * 2013-02-14 2014-08-22 한국원자력연구원 Porous metal shroud system for anode of electrolytic reduction apparatus
KR101437763B1 (en) 2013-02-14 2014-09-03 한국원자력연구원 Porous metal shroud system for anode of electrolytic reduction apparatus
KR101436240B1 (en) * 2013-02-26 2014-08-29 한국원자력연구원 integral anode for electrolytic reduction

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
최은영등. korean chemical engineering research. 2014.03.10., Vol. 52, No. 3, pp. 279~288 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190060110A (en) * 2017-11-24 2019-06-03 충남대학교산학협력단 The High Corrosion Resistance Structure and System of Oxygen Separating Electrode By Using Solid Oxide Membrane
KR102300905B1 (en) 2017-11-24 2021-09-10 충남대학교산학협력단 The High Corrosion Resistance Structure and System of Oxygen Separating Electrode By Using Solid Oxide Membrane

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