Flow-electrode capacitive deionization device capable of simultaneous adsorption and desorption operation

Abstract

Disclosed is a flow-electrode capacitive deionization device capable of simultaneous adsorption and desorption operation. A flow-electrode capacitive deionization device capable of simultaneous adsorption and desorption operation, according to one aspect of the present invention, may comprise: an ion adsorption unit for adsorbing target ions from an ion-containing leachate using a flowing electrode active material; and an ion desorption unit for desorbing ions from the electrode active material to which ions have been adsorbed in the ion adsorption unit.

Description

Flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation

[0001] The present invention relates to a flow electrode capacitive desalination device for recovering valuable metals, and more specifically, to a flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation that can recover a target valuable metal in a short time by operating adsorption and desorption simultaneously.

[0002] Conventional recovery of valuable metals is achieved through traditional metal smelting methods, such as wet smelting (solvent extraction) and precipitation, as well as dry smelting. Recently, research and development on valuable metals using electrochemical methods has been actively underway. The electrochemical method is an eco-friendly process that does not use acids, bases, or toxic chemicals—problems associated with conventional metal smelting processes—and does not emit harmful substances. Furthermore, it is attracting significant interest from an economic perspective as a low-energy process that requires relatively less energy for separation and purification compared to existing processes. In particular, among these electrochemical methods, the Capacitive Deionization (CDI) method offers the highest energy efficiency, while FCDI has the advantage of enabling continuous, large-capacity processing through the continuous desalination of flow electrodes.

[0003] Recently, numerous technologies regarding the application of FCDI to wastewater treatment, such as Chinese registered patent 107585835, for ammonia removal, fluoride removal, iodide and phosphate recovery, and heavy metal treatment, have been published. Most of these technologies relate to adsorption or removal rather than the recovery of specific valuable metals from wastewater.

[0004] However, to date, the development of technology regarding the process of adsorbing and desorbing target ions from a flow electrode for the purpose of recovering the adsorbed target ions has been insufficient. Even when recovery is achieved, the process proceeds by applying a reverse potential in the same cell to desorb the ions, which is discontinuous in the same way as in conventional CDI, and there is a problem of increased power consumption due to the long operating time.

[0005] The present invention aims to solve the aforementioned problems, and the objective of the present invention is to provide a flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation to recover a target metal more quickly from leachate or wastewater.

[0006] The problems of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

[0007] According to one aspect of the present invention, the ion adsorption unit for adsorbing a target ion from an ion leaching solution using a flowing electrode active material; and the ion desorption unit for desorbing ions from the electrode active material on which ions have been adsorbed in the ion adsorption unit; wherein the ion adsorption unit comprises: a first flow path through which the ion leaching solution flows; a first anion separator disposed on one side of the first flow path and through which anions from the ion leaching solution selectively pass; a first positive current collector disposed facing the first anion separator and forming a first anion flow path between itself and the first anion separator, through which anions that have permeated the first anion separator flow; a first flow positive electrode active material that flows within the first anion flow path and adsorbs anions within the first anion flow path; and a first cation separator disposed on the other side of the first flow path facing the first anion separator and through which a target cation from the leaching solution selectively passes. A flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation is provided, comprising: a first cathode current collector positioned to face the first cation separator and forming a first cation channel between the first cation separator and the first cation separator through which cations that have passed through the first cation separator flow; and a first flow negative electrode active material that flows within the first cation channel and adsorbs cations within the first cation channel.

[0008] The ion desorption unit may include: a second flow path through which ultrapure water flows; a second cation separator disposed on one side of the second flow path through which cations selectively pass; a second positive current collector disposed facing the second cation separator and forming a second cation flow path through which cations adsorbed in the ion adsorption unit flow between the second cation separator and the second cation separator; a second flow positive electrode active material containing cations adsorbed in the ion adsorption unit that flows within the second cation flow path; a second negative ion separator disposed on the other side of the second flow path through which anions selectively pass; a second negative current collector disposed facing the second negative ion separator and forming a second negative ion flow path through which a second flow negative electrode active material flows between the second negative ion separator and the second negative ion separator; and a second flow negative electrode active material that flows within the second negative ion flow path.

[0009] A target ion storage unit for storing the first flow negative electrode active material may be provided.

[0010] The above-mentioned target ion storage unit is provided to be selectively detachably attached to either the first cation channel or the second cation channel of the ion adsorption unit, so that the first flow negative electrode active material in which cations are adsorbed in the ion adsorption unit can be supplied as the second flow positive electrode active material of the ion desorption unit.

[0011] The above-mentioned target ion storage unit is simultaneously connected to the above-mentioned first cation channel and the above-mentioned second cation channel, thereby enabling the continuous supply of a first-flow negative electrode active material in which cations supplied through the first cation channel of the ion adsorption unit are adsorbed, as a second-flow positive electrode active material of the ion desorption unit.

[0012] The electrophoretic forces acting on the cations and anions within the first channel by the first positive current collector and the first negative current collector in the first channel of the ion adsorption part may be asymmetric to each other.

[0013] The electrophoretic force acting on anions may be smaller than the electrophoretic force acting on cations.

[0014] It may include an asymmetric power supply unit that applies different power to the first positive current collector and the first negative current collector.

[0015] The power applied to the first positive current collector may be lower than the power applied to the first negative current collector.

[0016] The above power may be either voltage or current.

[0017] The concentration of the first flow positive electrode active material and the concentration of the first flow negative electrode active material may be different from each other.

[0018] The concentration of the first flow positive electrode active material may be less than the concentration of the first flow negative electrode active material.

[0019] At least one of the first flow positive electrode active material, the first flow negative electrode active material, the second flow positive electrode active material, and the second flow negative electrode active material may be in a slurry state of a conductive material such as a carbon compound or a metal oxide.

[0020] The first flow positive electrode active material is ultrapure water, and at least one of the first flow negative electrode active material, the second flow positive electrode active material, and the second flow negative electrode active material may be in a slurry state of a conductive material such as a carbon compound or a metal oxide.

[0021] According to the above configuration, the flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation according to the present invention has the effect of recovering a target metal with excellent efficiency in a shorter time from a leachate or wastewater containing ions of various components.

[0022] In addition, the flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation according to the present invention has the effect of recovering high-purity target metal with low power consumption.

[0023] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

[0024] FIG. 1 is a drawing illustrating a flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation according to one embodiment of the present invention.

[0025] FIG. 2 is a diagram illustrating the adsorption of ions in the ion adsorption section of a flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation according to one embodiment of the present invention.

[0026] FIG. 3 is a drawing illustrating a flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation according to another embodiment of the present invention.

[0027] FIG. 4 is a drawing illustrating a flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation according to another embodiment of the present invention.

[0028] Figure 5 is a graph showing the electrical conductivity and the recovery rate of target ions (lithium ions) in the ion adsorption section and the ion desorption section according to the concentration of the flow electrode active material in the flow electrode capacitive desalination device capable of simultaneous adsorption and desorption of the present invention.

[0029] Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the description in the drawings have been omitted, and the same reference numerals have been used throughout the specification for identical or similar components.

[0030] The words and terms used in this specification and claims are not limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention in accordance with the principles by which the inventor defines terms and concepts to best describe his invention.

[0031] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings correspond to preferred embodiments of the present invention and do not represent all technical concepts of the present invention; thus, various equivalents and modifications that may replace such configurations may exist at the time of filing the present invention.

[0032] In this specification, terms such as “comprising” or “having” are intended to describe the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should not be understood as precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0033] The statement that a component is "in front," "rear," "upper," or "lower" of another component includes, unless there are special circumstances, not only being positioned "in front," "rear," "upper," or "lower" in direct contact with the other component, but also cases where another component is positioned in between. Furthermore, the statement that a component is "connected" to another component includes, unless there are special circumstances, not only being directly connected to each other, but also being indirectly connected to each other.

[0034] Hereinafter, a flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation according to one embodiment of the present invention will be described with reference to the drawings.

[0035] FIG. 1 is a diagram illustrating the configuration of a flow electrode capacitive desalination device (1000) capable of simultaneous adsorption and desorption operation according to one embodiment of the present invention.

[0036] The flow electrode capacitive desalination device (1000) capable of simultaneous adsorption and desorption operation according to the present embodiment may include an ion adsorption unit (100) and an ion desorption unit (200).

[0037] The above ion adsorption unit (100) may be configured to adsorb a target ion from an ion leaching solution (101) using a flowing electrode active material.

[0038] At this time, the ion leaching solution (101) may be a liquid containing various ions dissolved in it, such as wastewater or process products. For example, it may be a leaching solution in which rare components such as lithium are dissolved in an ionic state during the process of disassembling or separating batteries or extracting components from minerals. In this embodiment, the extraction of lithium from the ion leaching solution (101) will be described as an example. The ion leaching solution (101) may be lithium carbonate (Li2CO3).

[0039] That is, the ion adsorption unit (100) can adsorb a target ion onto an electrode active material from an ion leaching solution (101) in which various ions are mixed.

[0040] In addition, the ion desorption unit (200) can desorb ions from the electrode active material on which ions have been adsorbed in the ion adsorption unit (100).

[0041] Accordingly, by desorbing ions from the electrode active material in the ion desorption unit (200), the metal of the desired component can be recovered.

[0042] The above ion adsorption unit (100) may include a first flow path (110), a first anion separator (122), a first positive current collector (124), a first flow positive electrode active material (126), a first cation separator (132), a first negative electrode current collector (134), and a first flow negative electrode active material (136).

[0043] The first flow path (110) above is a flow path through which the ion leaching solution (101) flows. The ion leaching solution (101) can be stored in a first electrolyte storage tank (112).

[0044] The first anion separation membrane (122) may be positioned on one side of the first flow path (110) and configured to come into contact with the ion leaching liquid (101) flowing through the first flow path (110). The first anion separation membrane (122) allows anions from the ion leaching liquid (101) flowing through the first flow path (110) to pass through selectively.

[0045] The first positive current collector (124) is positioned to face the first negative ion separator (122), and can form a first negative ion channel (120) between the first negative ion separator (122) and the first negative ion separator (122) through which negative ions that have passed through the first negative ion separator (122) flow.

[0046] In addition, a first flow positive electrode active material (126) may flow within the first anion channel (120) and adsorb anions that have entered the first anion channel (120) by passing through the first anion separation membrane (122) while flowing within the first anion channel (120).

[0047] The first flow positive electrode active material (126) above may be in a slurry state of a conductive material such as a carbon compound (graphene, graphite, activated carbon, carbon fiber) or a metal oxide that is conductive and has excellent material adsorption capacity. For example, it may be activated carbon in a slurry state.

[0048] FIG. 2 is a diagram briefly illustrating the process of ions being adsorbed in the ion adsorption unit (100).

[0049] When power is applied to the first positive current collector (124) and the first negative current collector (134) while the ion leaching liquid (101) is flowing through the first flow path (110), cations (Li+), such as lithium, in the ion leaching liquid (101) flowing through the first flow path (110) are attracted by the first negative current collector (134) and enter the first positive flow path (130) through the first positive separator (132), and then are adsorbed onto the first flow negative electrode active material (136) flowing through the first positive flow path (130) and moved.

[0050] The first flow negative electrode active material (136) may have the same components as the first flow positive electrode active material (126).

[0051] In addition, the power applied to the first positive current collector (124) and the first negative current collector (134) may be the same voltage or current.

[0052] Additionally, the anions in the ion leaching solution (101) flowing within the first channel (110) are attracted by the first positive current collector (124) and drawn toward the first negative ion channel (120), and then enter the first negative ion channel (120) through the first negative ion separator (122), and then can be moved by being adsorbed onto the first flow positive electrode active material (126) flowing within the first negative ion channel (120).

[0053] At this time, the first flow negative electrode active material (136) and the first flow positive electrode active material (126) that adsorb the cations and anions can each be stored in separate storage tanks.

[0054] Alternatively, the adsorbed cations or anions in the storage tank may be separated and then circulated back to the first cation channel (130) or the first anion channel (120).

[0055] Here, the reservoir in which the first flow negative electrode active material (136) in which a cation (Li+), such as lithium, i.e., a target ion is adsorbed is stored is to be called the target ion storage unit (150).

[0056] Of course, in the description of this embodiment, the target ion is lithium (Li+), which is a cation, as an example, but other ions may be the target ion as needed. For example, if the target ion is an anion, the target ion storage unit (150) may be a storage tank in which the first flow positive electrode active material (126) is stored.

[0057]

[0058] Meanwhile, the above ion desorption unit (200) may include a second flow path (210), a second cation separator (222), a second positive current collector (234), a second flow positive electrode active material (226), a second negative ion separator (232), a second negative electrode current collector (224), and a second flow negative electrode active material (236).

[0059] The above second Euro (210) may be a flow path through which ultrapure water (201) flows. Here, the ultrapure water (201) may be deionized water from which various ions have been removed.

[0060] The second cation separation membrane (222) is positioned on one side of the second flow path (210) and comes into contact with the ultrapure water (201) flowing through the second flow path (210), and may be configured to allow cations to selectively pass between the second flow path (210) and the membrane.

[0061] The second positive current collector (234) is positioned to face the second positive ion separator (222), and can form a second positive ion channel (220) through which cations adsorbed from the ion adsorption unit (100) flow between the second positive ion separator (222).

[0062] In addition, a second flow positive electrode active material (226) containing cations such as lithium (Li+) adsorbed in the ion adsorption part (100) can flow within the second cation channel (220).

[0063] The above second flow positive electrode active material (226) may be the first flow negative electrode active material (136) of the above-described ion adsorption unit (100). That is, the first flow negative electrode active material (136) that adsorbs a desired cation, such as lithium (Li+), in the above-described ion adsorption unit (100) may be applied as the second flow positive electrode active material (226) of the above-described ion desorption unit (200).

[0064] Meanwhile, the second anion separation membrane (232) is positioned on the other side of the second channel (210) and comes into contact with the ultrapure water (201) flowing through the second channel (210), and may be configured to allow anions to selectively pass between the second channel (210) and the membrane.

[0065] Additionally, the second negative electrode current collector (224) is positioned to face the second negative ion separator (232), and a second negative ion channel (230) can be formed between the second negative ion separator (232) and the second negative ion separator, through which a second flow negative electrode active material (236) flows.

[0066] In addition, a second flow negative electrode active material (236) can flow within the second negative ion channel (230).

[0067] The above second flow negative electrode active material may have the same components as the above second flow positive electrode active material (226).

[0068] Accordingly, when ultrapure water (201) flows in the second flow path (210) and the second flow positive electrode active material (226) flows in the second flow positive electrode path (220), and power is applied to the second positive current collector (234) and the second negative current collector (224), the cations such as lithium (Li+) in the second flow positive electrode active material (226) are repulsed by the second positive current collector (234) and pushed toward the second flow path (210), passing through the second positive separation membrane (222) and moving toward the ultrapure water (201) in the second flow path (210).

[0069] Accordingly, the ultrapure water (201) flowing through the second Euro (210) can accommodate cations such as lithium (Li+) adsorbed in the ion adsorption unit (100), and the electrolyte solution in which lithium (Li+) is accommodated in the ultrapure water (201) can be stored in the second electrolyte storage tank (212).

[0070] Accordingly, the target ion adsorbed from the ion leaching solution (101) in the ion adsorption unit (100) can be recovered in the second electrolyte storage tank (212).

[0071] At this time, the first flow negative electrode active material (136) on which the target ion is adsorbed in the ion adsorption unit (100) can be stored in the target ion storage unit (150).

[0072] Additionally, the target ion storage unit (150) may be selectively and detachably provided in either the first cation channel (130) or the second cation channel (220) of the ion adsorption unit (100).

[0073] Accordingly, the target ion storage unit (150) can be filled with the first flow negative electrode active material (136) in which the target ion is adsorbed in the ion adsorption unit (100), and then removed from the ion adsorption unit (100), and then mounted in the second cation flow path (220) of the ion desorption unit (200) to provide the flow electrode active material in which the target ion is adsorbed in the second cation flow path (220) as the second flow positive electrode active material (226).

[0074] FIG. 3 is a drawing illustrating a flow electrode capacitive desalination device (2000) according to another embodiment of the present invention.

[0075] In the above-described embodiment, the target ion storage unit (150) is removed from the ion adsorption unit (100) while the first flow negative electrode, on which the target ion is adsorbed, is filled, and then mounted on the ion desorption unit (200), thereby allowing the ion adsorption unit (100) and the ion desorption unit (200) to operate independently, respectively, and the operation of the ion adsorption unit (100) and the ion desorption unit (200) may be temporarily suspended during the process of attaching and detaching the target ion storage unit (150). However, in the flow electrode capacitive desalination device (2000) according to the present embodiment, the ion adsorption unit (100) and the ion desorption unit (200) can be operated continuously.

[0076] In describing the flow electrode capacitive desalination device (2000) according to the present embodiment, components identical to those in the previously described embodiment are given the same names and numbers, and detailed descriptions are omitted. Additionally, since the flow electrode capacitive desalination device (2000) according to the present embodiment differs from the previously described embodiment in the target ion storage unit (3150), the target ion storage unit (2150) will be described.

[0077] As described above, the target ion storage unit (150) of the flow electrode capacitive desalination device (1000) of the above-described embodiment may be detachably installed in the ion adsorption unit (100) and the ion desorption unit (200), respectively. However, the target ion storage unit (2150) according to the present embodiment may be simultaneously connected to and shared with the ion adsorption unit (100) and the ion desorption unit (200).

[0078] That is, the target ion storage unit (2150) can be simultaneously connected to the first cation flow path (130) of the ion adsorption unit (100) and the second cation flow path (220) of the ion desorption unit (200).

[0079] Accordingly, the first flow negative electrode active material (136) in which the target ion is adsorbed in the ion adsorption unit (100) can be continuously supplied as the second flow positive electrode active material (226) of the ion desorption unit (200).

[0080] Therefore, the ion adsorption unit (100) and the ion desorption unit (200) can be operated without interruption, so the recovery of the target ion can be carried out more quickly and efficiently.

[0081]

[0082] FIG. 4 is a drawing illustrating a flow electrode capacitive desalination device (3000) according to another embodiment of the present invention.

[0083] In describing the flow electrode capacitive desalination device (3000) according to the present embodiment, components identical to those in the previously described embodiment are given the same names and numbers, and detailed descriptions are omitted.

[0084] In the ion adsorption section (100) of the flow electrode capacitive desalination device (1000) of the above-described embodiments, power of the same magnitude or intensity can be applied to the first positive current collector (124) and the first negative current collector (134).

[0085] Generally, when a cation (i.e., target ion) such as lithium is attracted to the first cation separator (132) by the first negative current collector (134), an anion paired with the cation is also attracted to the first cation separator (132), and an electrical double layer distributed on the surface of the first cation separator (132) can be formed. When the electrical double layer is formed, there is a risk that efficiency will be reduced as the cation, which is the target ion, is hindered from passing through the first cation separator (132).

[0086] Accordingly, in the flow electrode capacitive desalination device (3000) of the present embodiment, the electrophoretic force acting on the cations and anions within the first flow path (110) by the first positive current collector (124) and the first negative current collector (134) in the first flow path (110) of the ion adsorption unit (100) is made to act asymmetrically with respect to each other, thereby causing the electric double layer to be formed unstably and allowing the cations, which are the target ions, to pass through the first cation separation membrane (132) more quickly, thereby increasing the separation efficiency of the target ions.

[0087] At this time, to form asymmetry, the electrophoretic force acting on the anion can be made smaller than the electrophoretic force acting on the cation.

[0088] To this end, the concentration of the first flow positive electrode active material (3126) and the concentration of the first flow negative electrode active material (3136) can be formed differently from each other.

[0089]

[0090] As described above, the first flow positive electrode active material (3126) and the first flow negative electrode active material (3136) may both be activated carbon in a slurry state, and by making the concentrations of the activated carbon slurry different from each other, the electrophoretic force acting on the anion forms an asymmetry with the electrophoretic force acting on the cation.

[0091] That is, by forming the concentration of the first flow positive electrode active material (3126) to be less than the concentration of the first flow negative electrode active material (3136), the electrophoretic force acting on the anion can be formed to be smaller than the electrophoretic force acting on the cation.

[0092] Alternatively, by replacing the first flow positive electrode active material (3126) flowing through the first negative ion channel (120) with non-electrical ultrapure water (DI Water), the electrophoretic force acting on the negative ion can be formed to be smaller than the electrophoretic force acting on the positive ion.

[0093] At this time, when the first flow positive electrode active material is ultrapure water, at least one of the first flow negative electrode active material, the second flow positive electrode active material, and the second flow negative electrode active material may be in a slurry state of a conductive material such as a carbon compound (graphene, graphite, activated carbon, carbon fiber) or a metal oxide (electrode material).

[0094] Therefore, using only ultrapure water (DI Water: distilled water) as the first flow positive electrode active material (3126) has the effect of suppressing the formation of an electric double layer, and additionally, in the flow electrode capacitive desalination device (1000, 2000) of the above-described embodiments, a process of separating the positive electrode active material and the negative ions is required to regenerate the positive electrode active material (activated carbon), but in the flow electrode capacitive desalination device (3000) according to the present embodiment, a separate separation process may not be required.

[0095]

[0096] Alternatively, different power may be applied to the first positive current collector (124) and the first negative current collector (134) in order to make the electrophoretic force acting on the anion smaller than the electrophoretic force acting on the cation.

[0097] To this end, an asymmetric power supply unit (3300) that applies different power to the first positive current collector (124) and the first negative current collector (134), respectively, may be provided.

[0098] At this time, the power may be voltage or current.

[0099] That is, by applying a voltage or power to the first positive current collector at a lower value than the voltage or power applied to the first negative current collector (134), the electrophoretic force acting on the negative ions flowing in the first negative ion channel (120) can be formed to be smaller than the electrophoretic force acting on the positive ions.

[0100] FIG. 5 is a graph showing the conductivity and recovery rate of target ions (lithium ions) in the ion adsorption section (100) and ion desorption section (200) according to the concentration of the flow electrode active material.

[0101] In FIG. 5, Case 1 is when the concentration of the total flow electrode active material is 13%, and the target ion recovery rate is 85%. Also, Case 2 is when ultrapure water (201) is applied as the flow electrode active material flowing through the first anion channel (120) and the second anion channel (230), and the target ion recovery rate is 92.9%. Also, Case 3 is when ultrapure water (201) is applied only to the flow electrode active material flowing through the first anion channel (120) of the ion adsorption unit (100), and the target ion recovery rate is 92.7%, recording the highest efficiency.

[0102] Additionally, Case 4 is a case in which ultrapure water (201) is applied to the flow electrode active material flowing through the first anion channel (120) of the ion adsorption unit (100), and the thickness of the first cation separator (132) of the ion adsorption unit (100) is applied as 95 μm (all other ion separators other than the first cation separator (132) have a thickness of 60 μm), thereby realizing asymmetry in the thickness of the ion exchange membrane, and the target ion recovery rate at this time was 89.1%. In Case 4, the thickness of the first cation separator (132) is thicker than that of the other ion separators (first anion separator, second cation separator, second anion separator), so the structure is such that the effect of rapidly removing anions relative to cations can be expected.

[0103] Case 5 is a case where ultrapure water (201) is applied as the flow electrode active material of the ion adsorption unit (100) and the ion desorption unit (200), and the target ion recovery rate at this time was 76.3%.

[0104] As can be seen from the experimental results above, when ultrapure water (201) is applied to the flow electrode active material flowing through the first anion channel (120) to impart asymmetry to the electrophoretic force acting on the cations and anions within the first channel (110), it can be seen that the recovery rate of the target ion is improved.

[0105]

[0106] Although embodiments of the present invention have been described, the spirit of the present invention is not limited by the embodiments presented in this specification. Those skilled in the art who understand the spirit of the present invention may easily propose other embodiments within the scope of the same spirit by adding, changing, deleting, or adding components, and such are also to be considered to fall within the scope of the spirit of the present invention.

Claims

1. An ion adsorption unit that adsorbs a target ion from an ion leaching solution using a flowing electrode active material; and It includes an ion desorption unit that desorbs ions from an electrode active material in which ions are adsorbed in the ion adsorption unit; The above ion adsorption unit is, A first flow path through which the ion leaching solution flows; A first anion separation membrane disposed on one side of the first Euro, through which anions from the ion leaching solution selectively pass; A first positive current collector disposed facing the first anion separator and forming a first anion channel between itself and the first anion separator through which anions that have passed through the first anion separator flow; A first flow positive electrode active material that flows within the first anion channel and adsorbs anions within the first anion channel; A first cation separation membrane disposed on the other side of the first flow path so as to face the first anion separation membrane, through which a desired cation from the leaching solution selectively passes; A first cathode current collector positioned to face the first cation separator and forming a first cation flow path between itself and the first cation separator through which cations that have passed through the first cation separator flow; A first flow negative electrode active material that flows within the first cation channel and adsorbs cations within the first cation channel; A flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation, including 2. In Paragraph 1, The above ion desorption unit is, Second Euro where ultrapure water flows; A second cation separation membrane disposed on one side of the second Euro above, through which cations selectively pass; A second positive current collector positioned to face the second cation separator and forming a second cation flow path through which cations adsorbed in the ion adsorption portion flow between the second cation separator and the second cation separator; A second flow positive electrode active material that flows within the second cation channel and contains a cation adsorbed in the ion adsorption section; A second anion separation membrane disposed on the other side of the second Euro above, through which anions selectively pass; A second negative current collector positioned to face the second negative ion separator and forming a second negative ion channel through which a second flow negative electrode active material flows between the second negative ion separator and the second negative ion separator; A second flow negative electrode active material flowing within the second anion channel; A flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation, comprising 3. In Paragraph 2, A flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation, equipped with a purpose ion storage unit for storing a first flow negative electrode active material.

4. In Paragraph 3, A flow electrode capacitive desalination device capable of simultaneous adsorption and desorption, wherein the above-mentioned target ion storage unit is selectively detachably provided in either the first cation channel or the second cation channel of the ion adsorption unit, and the first flow negative electrode active material in which cations are adsorbed in the ion adsorption unit is supplied as the second flow positive electrode active material of the ion desorption unit.

5. In Paragraph 3, The above-mentioned target ion storage unit is, A flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation, which is simultaneously connected to the first cation channel and the second cation channel, thereby continuously supplying a first flow negative electrode active material in a state where cations supplied through the first cation channel of the ion adsorption unit are adsorbed as a second flow positive electrode active material of the ion desorption unit.

6. In Paragraph 1, The above ion adsorption part A flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation, wherein the electrophoretic forces acting on the cations and anions within the first flow path by the first anode current collector and the first cathode current collector in the first flow path are asymmetric to each other.

7. In Paragraph 6, A flow electrode capacitive desalination device capable of simultaneous adsorption and desorption, in which the electrophoretic force acting on anion is smaller than the electrophoretic force acting on cation.

8. In Paragraph 6, A flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation, comprising an asymmetric power supply unit that applies different power to the first positive current collector and the first negative current collector.

9. In Paragraph 8, A flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation, wherein the power applied to the first anode current collector is lower than the power applied to the first cathode current collector.

10. In Paragraph 8, The above power is either voltage or current, and the flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation.

11. In Paragraph 6, A flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation, wherein the concentration of the first flow positive electrode active material and the concentration of the first flow negative electrode active material are different.

12. In Paragraph 11, A flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation, wherein the concentration of the first flow positive electrode active material is less than the concentration of the first flow negative electrode active material.

13. In Paragraph 6, A flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation, wherein at least one of the first flow positive electrode active material, the first flow negative electrode active material, the second flow positive electrode active material, and the second flow negative electrode active material is in a slurry state of a conductive material of a carbon compound or a metal oxide.

14. In Paragraph 13, The above-mentioned first flow positive electrode active material is ultrapure water, and A flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation, wherein at least one of the first flow negative electrode active material, the second flow positive electrode active material, and the second flow negative electrode active material is in a slurry state of a conductive material of a carbon compound or a metal oxide.

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