CN-121972008-A - Target ion separation device and method based on electrobath salt configuration

CN121972008ACN 121972008 ACN121972008 ACN 121972008ACN-121972008-A

Abstract

The application discloses a target ion separation device and method based on an electrobath salt configuration, and particularly belongs to the technical field of membrane separation. The device comprises a first polar chamber, a first standard ion exchange membrane and a second polar chamber, wherein the first standard ion exchange membrane and the second polar chamber are adjacent to the first polar chamber, the polarities of electrodes in the first polar chamber and the second polar chamber are opposite, at least one unit membrane stack is arranged between the first standard ion exchange membrane and the second polar chamber, and the unit membrane stack comprises a storage chamber, a second standard ion exchange membrane, a feed liquid chamber, a selective membrane, a receiving chamber and a third standard ion exchange membrane which are sequentially arranged. The device can strengthen selective separation through the arrangement mode of the membrane, has strong process flexibility, can adjust configuration parameters according to the impurity composition of different salt solutions, realizes high-efficiency separation and high-concentration collection of target ions, and is suitable for the production requirements of high-purity salt in a plurality of industries.

Inventors

MA XINMEI
JIANG MENGLIN
SUN JUNJIE
ZHANG YANG
QIN ZIHAN
ZHANG QINGLEI

Assignees

烟台金正环保科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260109

Claims (9)

1. The target ion separation device based on the electrowash salt configuration is characterized by comprising a first polar chamber, a first standard ion exchange membrane and a second polar chamber, wherein the first standard ion exchange membrane and the second polar chamber are adjacent to the first polar chamber; The polarities of the electrodes in the first polar chamber and the second polar chamber are opposite; at least one unit membrane stack is arranged between the first standard ion exchange membrane and the second pole chamber; The unit membrane stack comprises a reserve chamber, a second standard ion exchange membrane, a feed liquid chamber, a selective membrane, a receiving chamber and a third standard ion exchange membrane which are sequentially arranged, wherein the first standard ion exchange membrane and the second standard ion exchange membrane are opposite-charge ion exchange membranes, the charge of the second standard ion exchange membrane is the same as that of the selective membrane, and the charge of the first standard ion exchange membrane is the same as that of the third standard ion exchange membrane.
2. The ion separation device of claim 1, wherein the polar liquids in the first polar chamber and the second polar chamber are sodium sulfate solution or sodium chloride solution, and the polar liquid concentration is 0.3-0.5 mol/L.
3. The apparatus of claim 2, wherein the ion separator comprises a plurality of ion separators, When the target ion is a cation, the built-in electrode in the first polar chamber is an anode, and the first standard ion exchange membrane is a cathode membrane; when the target ion is an anion, the built-in electrode in the first polar chamber is a cathode, and the first standard ion exchange membrane is a cation membrane.
4. The target ion separation device based on an electrowash salt configuration according to claim 1, wherein a solution corresponding to ions trapped by the selective membrane is introduced into the storage chamber, and the concentration of the solution corresponding to the ions trapped by the selective membrane is 0.5-3 mol/L.
5. The ion target separation device based on an electrowash salt configuration according to claim 1, wherein the feed liquid chamber is vented with liquid to be separated.
6. The target ion separation device based on an electrowash salt configuration of claim 1, wherein the receiving chamber is filled with a target ion solution, and the concentration of the target ion solution is 0.01-0.1 mol/L.
7. The target ion separation device based on an electro-salt washing configuration of claim 1, wherein the inlet flow rate of the first polar chamber, the second polar chamber, the reserve chamber, the feed liquid chamber and the receiving chamber is 10-35 l/h.
8. The ion separation device according to claim 1, wherein a constant current is applied to the electrodes of the first and second polar chambers at a current density of 50 to 200a/m 2 .
9. A method for separating target ions based on an electrowash salt configuration, wherein the separation method is used for the target ion separation device based on an electrowash salt configuration as claimed in any one of claims 1 to 8, and the separation method comprises: Step 1, introducing sodium sulfate solution or sodium chloride solution into a first polar chamber and a second polar chamber, introducing solution corresponding to ions trapped by a selective membrane into a storage chamber, introducing liquid to be separated into a feed liquid chamber, introducing target ion solution into a receiving chamber, and controlling the feed liquid flow rates of the first polar chamber, the second polar chamber, the storage chamber, the feed liquid chamber and the receiving chamber; Step 2, switching on an electrode power supply, and applying constant current to electrodes of the first polar chamber and the second polar chamber; And 3, collecting the target ion solution after the target ions are enriched in the receiving chamber and the concentration of the target ions is stable.

Description

Target ion separation device and method based on electrobath salt configuration Technical Field The application relates to the technical field of membrane separation, in particular to a target ion separation device and method based on an electrobath salt configuration. Background With industry development and population growth, the need for high purity salts (e.g., food grade, pharmaceutical grade or electronic grade salts) is increasing. The traditional salt purification method mainly comprises a recrystallization method, a chemical precipitation method, an evaporation concentration method and the like, but the methods generally have the problems of high energy consumption, complex process, limited product purity, large amount of waste liquid generation and the like. For example, recrystallization requires multiple dissolution and crystallization processes, which are not only inefficient, but may introduce new impurities, and chemical precipitation laws rely on the addition of reagents, which may affect the final quality of the salt and increase the cost of subsequent processing. Electrodialysis technology is used as a mature membrane separation technology, and is widely applied to the fields of water treatment, food processing, chemical purification and the like. However, conventional electrodialysis devices employ a conventional configuration of "polar compartment-ion exchange membrane-depletion compartment-ion exchange membrane-concentrating compartment-polar compartment". However, the conventional electrodialysis device has insufficient membrane selectivity, and the separation between multivalent ions (such as SO 42-、Ca2+、Mg2+ and the like) and monovalent ions (Cl -、Na+、NO3-) or monovalent ions by using a common ion exchange membrane is limited, SO that high-purity preparation is difficult to realize, multiple stages of treatments or other purification processes are often required, and the complexity of the system is increased. In addition, the traditional electrodialysis device adopts a fixed membrane stack arrangement mode, so that the migration paths of different ions are difficult to flexibly regulate and control, the purification effect is influenced, and the production requirements of high-purity salt in multiple industries are difficult to meet. Accordingly, there is a need to develop a target ion separation device and method based on an electrowash salt configuration to solve the above-mentioned problems. Disclosure of Invention In view of the above, the application provides a target ion separation device and a method based on an electrowash salt configuration, which can strengthen selective separation through a membrane arrangement mode, have strong process flexibility, can adjust configuration parameters according to impurity composition of different salt solutions, realize high-efficiency separation and high-concentration collection of target ions, and are suitable for high-purity salt production requirements of a plurality of industries. Specifically, the method comprises the following technical scheme: In a first aspect, the present application provides a target ion separation device based on an electrowash salt configuration, the device comprising a first polar chamber, a first standard ion exchange membrane adjacent to the first polar chamber, and a second polar chamber; The polarities of the electrodes in the first polar chamber and the second polar chamber are opposite; at least one unit membrane stack is arranged between the first standard ion exchange membrane and the second pole chamber; The unit membrane stack comprises a reserve chamber, a second standard ion exchange membrane, a feed liquid chamber, a selective membrane, a receiving chamber and a third standard ion exchange membrane which are sequentially arranged, wherein the first standard ion exchange membrane and the second standard ion exchange membrane are opposite-charge ion exchange membranes, the charge of the second standard ion exchange membrane is the same as that of the selective membrane, and the charge of the first standard ion exchange membrane is the same as that of the third standard ion exchange membrane. So configured, the trapped ions in the reserve chamber, which are the ions trapped by the selective membrane, can be directed into the feed liquid chamber. The selective membrane is made of a membrane material with specific permeability to target ions, only allows the target ions to pass through, intercepts other impurity ions, and ensures the purity of the target ions in the receiving chamber. The polarity of the electrodes in the first pole chamber and the second pole chamber is opposite. The first standard ion exchange membrane and the second standard ion exchange membrane are opposite-charge ion exchange membranes, the second standard ion exchange membrane and the selective membrane are the same in charge, the first standard ion exchange membrane and the third standard ion exchange membrane are the same in