KR-20260063624-A - Flow-electrode Capacitive Deionization Devices Capable of Simultaneous Adsorption and Desorption Operation

KR20260063624AKR 20260063624 AKR20260063624 AKR 20260063624AKR-20260063624-A

Abstract

A flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation is disclosed. A flow electrode capacitive desalination device capable of simultaneous adsorption and desorption operation according to one aspect of the present invention may include: an ion adsorption unit that adsorbs a target ion from an ion leaching solution using a flowing electrode active material; and an ion desorption unit that desorbs ions from the electrode active material on which ions have been adsorbed in the ion adsorption unit.

Inventors

변광수
정용두
조성근
조범균

Assignees

도레이첨단소재 주식회사

Dates

Publication Date: 20260507
Application Date: 20241030

Claims (14)

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
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
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.

Description

Flow-electrode Capacitive Deionization Devices Capable of Simultaneous Adsorption and Desorption Operation 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. 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. 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. 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. 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. 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. 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. 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. FIG. 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. 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 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. 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. 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. 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 a