Electrooxidation-reduction-based desalting device for mineralized water and mineralized water desalting method

Abstract

The invention provides a desalination device for mineralized water based on electrooxidation reduction and a desalination method for mineralized water, and relates to the technical field of desalination, in the device, a cation exchange membrane CEM is arranged at the communication position between an anode chamber and a salt gathering flow chamber, and an anion exchange membrane AEM is arranged at the communication position between the salt gathering flow chamber and a desalination flow chamber; a cation exchange membrane CEM is arranged at the communication part between the desalting flow chamber and the cathode chamber; the liquid inlet end of the first peristaltic pump is communicated with the electrolysis containing cavity, the anode chamber, the cathode chamber and the first peristaltic pump through pipelines, the salt gathering containing cavity, the salt gathering flow chamber and the second peristaltic pump are communicated through pipelines, the desalting containing cavity, the desalting flow chamber and the third peristaltic pump are communicated through pipelines, and electric fields are applied to the two sides through polar plates; mineralized water to be desalted is added into the salt gathering cavity and the desalting cavity, and the mineralized water to be desalted and electrolyte are added into the electrolysis cavity. According to the scheme, rapid and continuous desalination can be realized, and deposition is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of desalination, and in particular to a desalination device for mineralized water based on electrical oxidation and reduction and a desalination method for mineralized water. Background Art

[0002] With the rapid development of industry, the daily water consumption of the chemical base has increased. However, the surface materials of many energy and chemical bases are mainly sandy and gravelly, and rainfall is scarce, such as the Ningdong Energy and Chemical Base. Therefore, the production and living water of the base and various mining areas mainly come from large spring water and Yellow River water. The amount of large spring water is decreasing year by year, and the amount of Yellow River water is also limited. Therefore, the shortage of available water resources has gradually become an important bottleneck for the development of the Ningdong area. However, the amount of mineralized water such as mine water in the mining areas of the Ningdong Energy and Chemical Base is abundant. At present, the roughly treated mine water has been used for daily fire fighting and dust prevention, but the treatment of mineralized water has not yet reached the level of fresh water for daily use. Desalination of mine water can, on the one hand, reduce the pollution caused by the discharge of mine water to the surrounding environment, and on the other hand, it can alleviate the pressure of water shortage in the Ningdong area.

[0003] Mineralized water is rich in Na, Mg, Ca, Li and other substances. Although traditional desalination technologies, such as reverse osmosis, multi-stage flash evaporation, multi-effect evaporation and electrodialysis, have been commercially applied on a large scale, they all have problems such as high energy consumption, secondary pollution and low water recovery rate. Electrochemical desalination technology has gradually been favored due to its advantages such as low energy consumption, high water utilization rate and green environmental protection. For example, capacitive deionization (CDI) is a widely studied electrochemical desalination technology. However, due to the limited adsorption capacity of traditional CDI and the inability to desalinate continuously, researchers in this field later proposed a multi-channel redox CDI (MC-RCDI) system. The system includes a salt flow channel and two electrolyte channels, which has continuous desalination capacity, but will form salt ion deposition to reach the adsorption limit, and then cause the salt ions to precipitate and produce deposition, which hinders the continuous desalination process. Therefore, the current electrochemical method for treating mineralized water such as mine water and brine is not ideal. Summary of the invention

[0004] In view of this, in order to address the above shortcomings, it is necessary to propose a desalination device for mineralized water and a desalination method for mineralized water based on electro-oxidation reduction, which can achieve rapid and continuous desalination without producing sedimentation.

[0005] In a first aspect, the present invention provides a desalination device for mineralized water based on electric oxidation and reduction, the desalination device comprising: an anode plate, a cathode plate, an anode chamber, a cathode chamber, a polysalt flow chamber, a desalination flow chamber, a polysalt chamber, a desalination chamber, an electrolysis chamber, a first peristaltic pump, a second peristaltic pump and a third peristaltic pump; the anode chamber, the cathode chamber, the polysalt flow chamber and the desalination flow chamber are arranged in sequence and are connected at the sides, a cation exchange membrane CEM is arranged at the connection between the anode chamber and the polysalt flow chamber, an anion exchange membrane AEM is arranged at the connection between the polysalt flow chamber and the desalination flow chamber, a cation exchange membrane CEM is arranged at the connection between the desalination flow chamber and the cathode chamber, an anode plate is arranged on the other side of the anode chamber, a cathode plate is arranged on the other side of the cathode chamber, and the anode plate and the cathode plate are separated. The first peristaltic pump is connected to the positive and negative electrodes of the power supply respectively; the liquid inlet end of the first peristaltic pump is connected to the electrolysis chamber, the liquid outlet end is connected to one end of the anode chamber, the other end of the anode chamber is connected to one end of the cathode chamber, and the other end of the cathode chamber is connected to the electrolysis chamber; the liquid inlet end of the second peristaltic pump is connected to the polysalt chamber, the liquid outlet end is connected to one end of the polysalt flow chamber, and the other end of the polysalt flow chamber is connected to the polysalt chamber; the liquid inlet end of the third peristaltic pump is connected to the desalination chamber, the liquid outlet end is connected to one end of the desalination flow chamber, and the other end of the desalination flow chamber is connected to the desalination chamber; the polysalt chamber and the desalination chamber are used to add the mineralized water to be desalted, and the electrolysis chamber is used to add the mineralized water to be desalted and the electrolyte.

[0006] Preferably, the anode plate and the cathode plate are both made of an acrylic plate and graphite paper, one side of the graphite paper is fixed on the acrylic plate, and the other side is in sealing contact with the anode chamber or the cathode chamber.

[0007] Preferably, the cation exchange membrane CEM and the anion exchange membrane AEM are both monovalent ion exchange membranes.

[0008] In a second aspect, the present invention provides a method for desalting mineralized water, using any one of the mineralized water desalination devices based on electrical oxidation and reduction as described in the first aspect to desalinate the mineralized water; wherein, using I - and as electrolyte; before desalination treatment, add the mineralized water to be desalted into the polysalt chamber and the desalination chamber respectively, add the mineralized water to be desalted and a mixed solution composed of iodine and sodium iodide or lithium iodide into the electrolysis chamber; connect the peristaltic pumps and turn on the power to generate an electric field between the anode plate and the cathode plate; during desalination treatment, In the cathode chamber, it is reduced to I - , I - Metal cations in the mineralized water are captured from the desalination stream by a CEM adjacent to the cathode chamber. - The captured metal cations enter the anode chamber through a peristaltic pump; in the anode chamber, I - Oxidized to Metal cations are released into the salt-accumulating flow chamber through the CEM adjacent to the anode chamber; anions in the mineralized water enter the salt-accumulating flow from the desalting flow through the AEM due to the electrical neutrality of the salt solution. The cycle is completed by migrating to the cathode chamber through the first peristaltic pump; this process allows the salt in the desalted stream to be continuously removed and enriched in the concentrated salt stream.

[0009] Preferably, the anion exchange membrane AEM and the cation exchange membrane CEM use monovalent ion exchange membranes to perform sustainable magnesium and lithium separation on brine.

[0010] Preferably, the voltage applied by the power supply to the anode plate and the cathode plate is 0.5-0.7V.

[0011] Preferably, when the electrolyte is iodine and lithium iodide, the content of lithium iodide added to the electrolytic chamber is 0.5 mol / L, and the content of iodine added is 0.05 mol / L.

[0012] It can be known from the above technical scheme that in the desalination device for mineralized water and the desalination method for mineralized water based on electrical oxidation and reduction provided in the embodiments of the present invention, the anode chamber, cathode chamber, polysalt flow chamber and desalination flow chamber of the device are arranged in sequence and connected at the sides, a cation exchange membrane CEM is arranged at the connection between the anode chamber and the polysalt flow chamber, an anion exchange membrane AEM is arranged at the connection between the polysalt flow chamber and the desalination flow chamber, a cation exchange membrane CEM is arranged at the connection between the desalination flow chamber and the cathode chamber, and an electric field is formed by applying voltage to the anode plate and the cathode plate. Further, by driving the circulation through the first peristaltic pump in the external circulation, the polysalt flow circulation is carried out between the polysalt flow chamber and the polysalt storage cavity through the second peristaltic pump, and the desalination flow circulation is carried out between the desalination flow chamber and the desalination storage cavity through the third peristaltic pump. In this way, under the action of the electric field, In the cathode chamber, it is reduced to I - , I - Metal cations in the mineralized water are captured from the desalination stream by a CEM adjacent to the cathode chamber. - The captured metal cations enter the anode chamber through a peristaltic pump; in the anode chamber, I - Oxidized to Metal cations are released into the salt-accumulating flow chamber through the CEM adjacent to the anode chamber; anions in the mineralized water enter the salt-accumulating flow from the desalting flow through the AEM due to the electrical neutrality of the salt solution. The first peristaltic pump migrates to the cathode chamber to complete the cycle; this process allows the salt in the desalination flow to be continuously removed and enriched in the polysalt flow, thereby achieving rapid and continuous desalination of mineralized water. Since the electrolytes on both sides are circulated and connected, the salt ion deposition will not reach the adsorption limit. In addition, this scheme uses I - and As an electrolyte, the compound produced by its combination with magnesium, calcium and other ions has extremely high solubility in the solution, and even almost all of it is soluble, so no precipitation will occur, and thus I - and Nor will it be consumed during the ion extraction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic structural diagram of a desalination device for mineralized water based on electrical oxidation-reduction provided in an embodiment of the present invention.

[0014] Figure 2 A schematic diagram of the principle of a desalination process for mineralized water based on electrical oxidation-reduction provided in an embodiment of the present invention.

[0015] Figure 3 Mg under standard ion exchange membrane and monovalent ion exchange membrane 2+ The current change and conductivity change curve.

[0016] Figure 4 The graphs show the current, conductivity and ion concentration curves before and after desalination of mineralized water under standard ion exchange membrane and monovalent ion exchange membrane.

[0017] Figure 5 The ion concentration of mineralized water before and after desalination under high and low voltages and Li + / Mg 2+ Plot of experimental data of concentration ratio.

[0018] In the figure: anode plate 1, cathode plate 2, anode chamber 3, cathode chamber 4, polysalt flow chamber 5, desalt flow chamber 6, polysalt chamber 7, desalt chamber 8, electrolysis chamber 9, first peristaltic pump 10, second peristaltic pump 11, third peristaltic pump 12, cation exchange membrane 13, anion exchange membrane 14. DETAILED DESCRIPTION

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] See also Figure 1-2As shown, the present invention provides a desalination device for mineralized water based on electric oxidation and reduction, and the desalination device comprises: an anode plate 1, a cathode plate 2, an anode chamber 3, a cathode chamber 4, a polysalt flow chamber 5, a desalination flow chamber 6, a polysalt chamber 7, a desalination chamber 8, an electrolysis chamber 9, a first peristaltic pump 10, a second peristaltic pump 11 and a third peristaltic pump 12; the anode chamber 3, the cathode chamber 4, the polysalt flow chamber 5 and the desalination flow chamber 6 are arranged in sequence and are connected at the sides, a cation exchange membrane 13CEM is arranged at the connection between the anode chamber 3 and the polysalt flow chamber 5, an anion exchange membrane 14AEM is arranged at the connection between the polysalt flow chamber 5 and the desalination flow chamber 6, a cation exchange membrane 13CEM is arranged at the connection between the desalination flow chamber 6 and the cathode chamber 4, an anode plate 1 is arranged on the other side of the anode chamber 3, and a cathode chamber 4 is arranged at the other side of the cathode chamber 4. A cathode plate 2 is arranged on the other side, and the anode plate 1 and the cathode plate 2 are connected to the positive and negative electrodes of the power supply respectively; the liquid inlet end of the first peristaltic pump 10 is connected to the electrolysis chamber 9, and the liquid outlet end is connected to one end of the anode chamber 3, the other end of the anode chamber 3 is connected to one end of the cathode chamber 4, and the other end of the cathode chamber 4 is connected to the electrolysis chamber 9; the liquid inlet end of the second peristaltic pump 11 is connected to the polysalt chamber 7, the liquid outlet end is connected to one end of the polysalt flow chamber 5, and the other end of the polysalt flow chamber 5 is connected to the polysalt chamber 7; the liquid inlet end of the third peristaltic pump 12 is connected to the desalination chamber 8, the liquid outlet end is connected to one end of the desalination flow chamber 6, and the other end of the desalination flow chamber 6 is connected to the desalination chamber 8; the polysalt chamber 7 and the desalination chamber 8 are used to add the mineralized water to be desalted, and the electrolysis chamber 9 is used to add the mineralized water to be desalted and the electrolyte.

[0021] In this embodiment, the communication between the cavity, the chamber and the peristaltic pump is carried out through pipelines.

[0022] In one embodiment, the anode plate 1 and the cathode plate 2 are both made of an acrylic plate and graphite paper, one side of the graphite paper is fixed on the acrylic plate, and the other side is in sealing contact with the anode chamber 3 or the cathode chamber 4 .

[0023] In one embodiment, both the cation exchange membrane 13CEM and the anion exchange membrane 14AEM are monovalent ion exchange membranes.

[0024] In one embodiment, the present invention further provides a method for desalination of mineralized water, using the mineralized water desalination device based on electrical oxidation and reduction as in the above embodiments to desalinate the mineralized water; wherein, using I - and As electrolyte; before desalination treatment, add the mineralized water to be desalted to the polysalt chamber 7 and the desalination chamber 8 respectively, add the mineralized water to be desalted and the mixed solution composed of iodine and sodium iodide or lithium iodide to the electrolysis chamber 9; connect the peristaltic pumps and turn on the power to generate an electric field between the anode plate 1 and the cathode plate 2; during desalination treatment, In the cathode chamber 4, it is reduced to I - , I -The metal cations in the mineralized water are captured from the desalination stream by the CEM adjacent to the cathode chamber 4, while I - The captured metal cations enter the anode chamber 3 through a peristaltic pump; in the anode chamber 3, I - Oxidized to Metal cations are released into the salt-accumulating flow chamber through the CEM adjacent to the anode chamber 3; anions in the mineralized water enter the salt-accumulating flow from the desalting flow through the AEM due to the electrical neutrality of the salt solution. The first peristaltic pump 10 migrates to the cathode chamber 2 to complete the cycle; this process allows the salt in the desalted stream to be continuously removed and simultaneously enriched in the concentrated salt stream.

[0025] Among them, the salt-accumulating flow mentioned in this embodiment is the salt flow circulating in the circulation system composed of the second peristaltic pump 11, the salt-accumulating cavity 7 and the salt-accumulating flow chamber 5, and the desalting flow is the salt flow circulating in the circulation system composed of the third peristaltic pump 12, the desalting cavity 8 and the desalting flow chamber 6.

[0026] Compared with the existing scheme, this scheme will not cause salt ion deposition to reach the upper limit of adsorption due to the circulation of electrolytes on both sides, which can not only achieve rapid and continuous desalination of mineralized water. 2+ , Ca 2+ To a certain extent, it will combine with ferrocyanide to form a precipitate, resulting in [Fe(CN) 6 ] 3- / [Fe(CN) 6 ] 4- This reduces the desalination rate, resulting in unsatisfactory treatment of large volumes of mineralized water. This solution considers improving the electrolyte to solve the problem of high Mg 2+ , Ca 2+ Solution problem.

[0027] Specifically, the electrolyte used in the original plan is potassium ferrocyanide / potassium ferrocyanide, which are soluble in water and have high solubility. Sodium ferrocyanide / sodium ferrocyanide formed by the combination of sodium ions and ferrocyanide / ferrocyanide is also soluble. However, when magnesium and calcium ions come into contact with ferrocyanide / ferrocyanide, magnesium ferrocyanide / magnesium ferrocyanide and calcium ferrocyanide / calcium ferrocyanide will be produced. The solubility of these four compounds in aqueous solution is very low. When the ion concentration in the solution reaches saturation, the excess solute will precipitate to form a solid precipitate, which appears as a white milky precipitate in water. After ferrocyanide / ferrocyanide becomes a precipitate, it cannot participate in the redox reaction. The magnesium iodide produced by the redox pair combining with magnesium and calcium ions has a very high solubility in the solution, reaching 151g / 100mL at 25°C, which is equivalent to the solubility of sodium iodide. Therefore, magnesium iodide and calcium iodide are basically completely soluble in the solution without precipitation. It is not consumed during ion extraction.

[0028] In addition, the brine in the mineralized water is rich in lithium, and the separation of lithium is also of great significance. The main problem in the current electrochemical brine lithium extraction technology is the separation of lithium and magnesium. Other ion separation technologies are more effective, and the brine is mainly Li + and Mg 2+ At present, some people have proposed to replace the cation exchange membrane 13 with LAGP (a highly lithium-selective solid electrolyte) to extract lithium from brine based on this model. Although the effect is good, the production process of LAGP is complicated and expensive and has not been commercialized. In addition, there is still a risk of precipitation of ferrocyanide on both sides. This scheme considers replacing the ordinary ion exchange membrane with a monovalent ion exchange membrane, and using electrolytes on both sides. Has a high redox capacity, while the monovalent ion exchange membrane will significantly reduce Mg 2+ , Ca 2+ ions, and because the electrolyte is Mg 2+ , Ca 2+ Although it will partially pass through the monovalent ion exchange membrane to reach the electrolyte, no precipitation will occur, and sustainable lithium-magnesium separation can be carried out. In terms of application cost and redox electrolyte pairs, they may have good application potential in electrochemical brine lithium extraction.

[0029] Moreover, when desalting lithium-rich mineral water, iodine and lithium iodide are preferably used as electrolytes, and the content of lithium iodide added to the electrolytic chamber 9 is 0.5 mol / L, and the content of iodine added is 0.05 mol / L, that is, 0.5 mol of lithium iodide and 0.05 mol of iodine are added to 1 L of mineral water.

[0030] In addition, appropriately reducing the voltage also has certain advantages for separating lithium. For example, the voltage applied by the power supply to the anode plate 1 and the cathode plate 2 can be 0.5-0.7V.

[0031] The effect of this scheme is explained below in combination with a specific lithium extraction experiment; Experiments were conducted as electrolytes to test the Mg content of monovalent ion exchange membranes. 2+ Blocking capacity, comparison of lithium extraction capacity between standard ion exchange membrane and monovalent ion exchange membrane, and lithium extraction capacity under different voltages when using monovalent ion exchange membrane.

[0032] Example 1: Effects of different ion exchange membranes on the performance of lithium extraction from brine

[0033] like Figure 3 (a), (b) and Figure 3 (c) and (d) represent the Mg 2+ The current change, conductivity change and Mg under the monovalent ion exchange membrane2+ The current change and conductivity change of the standard ion exchange membrane are calculated. 2+ The ASRR (average desalination rate) is 137.5 μg / cm 2 ·min, monovalent ion exchange membrane for Mg 2+ The ASRR was 66.2 μg / cm 2 ·min. It can be seen that the monovalent ion exchange membrane has a 2+ With a blocking rate of 52%, Li + The average desalination rate was the same, confirming the feasibility of the ion exchange membrane for partial separation of lithium and magnesium.

[0034] The lithium-magnesium separation capabilities of standard ion exchange membranes and monovalent ion exchange membranes were tested: Figure 4 (a), (b), (c) and 4(d), (e), (f) respectively represent the current change under the standard ion exchange membrane in brine, conductivity, ion concentration before and after desalination, and Mg under the monovalent ion exchange membrane 2+ Current changes, conductivity changes, and ion concentration before and after desalination. Figure 4 (c) and (f) are the ion concentrations and Li + / Mg 2+ According to calculations, standard ion exchange membranes can only remove 52% of Li + Rate, 70% Mg removal 2+ The monovalent ion exchange membrane has 81.2% Li removal rate. + Rate, 71% Mg removal 2+ rate, but under the condition of monovalent ion exchange membrane, due to the solution error Mg 2+ The concentration is 1.8 times that on the left, so it is theoretically less likely to remove Mg 2+ , still reflects the hindrance to the movement of magnesium ions. And for the desalination flow, Li + / Mg 2+ The lower the value, the better the separation effect. The higher the polysalt flow, the better. Under standard exchange membrane. The electrolyte solid used in this data is sodium iodide. The Na+ of the primary electrolyte enters the polysalt flow. Otherwise, the Li+ in the polysalt flow will + More aggregates were formed, and no electrolyte precipitation was found during the entire test, and the desalination rate was relatively stable.

[0035] Example 2: Effects of high and low voltage on the separation performance of magnesium and lithium in brine

[0036] Figure 5 (a) and (b) show the ion concentration and Li before and after desalination at 0.6 V, respectively. + / Mg 2+ , ion concentration before and after desalination at 1.2V and Li + / Mg2+ The solid electrolyte used in this data is LiI, and the polysalt flow will be more impressive. At 0.6V, due to the low voltage, Mg 2+ The number of ions forced to pass through the monovalent ion exchange membrane is reduced, thereby improving the lithium-magnesium separation capacity. At 0.6V, the lithium extraction rate reached 79%, and the magnesium pass rate was only 21%. The lithium extraction rate at 1.2V was only 53%, and the Li of the desalination flow at 0.6V was + / Mg 2+ Lower than 1.2V, the Li + / Mg 2+ It is higher than that at 1.2 V. The above data show that appropriate low voltage is helpful for the selective migration of ions in this model and has good separation ability.

[0037] In summary, this plan is based on As the electrolyte, the use of monovalent ion exchange membrane not only has a better desalination effect, but also does not produce precipitation in the mineralized water, which has a good application prospect for future electrochemical mineralization separation.

[0038] The modules or units in the device of the embodiment of the present invention can be combined, divided and deleted according to actual needs. The above disclosure is only the preferred embodiment of the present invention, and of course it cannot be used to limit the scope of the rights of the present invention. Those skilled in the art can understand that all or part of the processes of the above embodiment are implemented, and the equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A desalination device for mineralized water based on electrical oxidation-reduction, characterized in that: The desalination device comprises: an anode plate, a cathode plate, an anode chamber, a cathode chamber, a salt-accumulating flow chamber, a desalination flow chamber, a salt-accumulating cavity, a desalination cavity, an electrolysis cavity, a first peristaltic pump, a second peristaltic pump and a third peristaltic pump; the anode chamber, the cathode chamber, the salt-accumulating flow chamber and the desalination flow chamber are arranged in sequence and are connected at the sides; a cation exchange membrane CEM is arranged at the connection between the anode chamber and the salt-accumulating flow chamber, an anion exchange membrane AEM is arranged at the connection between the salt-accumulating flow chamber and the desalination flow chamber, a cation exchange membrane CEM is arranged at the connection between the desalination flow chamber and the cathode chamber, an anode plate is arranged at the other side of the anode chamber, a cathode plate is arranged at the other side of the cathode chamber, and the anode plate and the cathode plate are connected to the positive electrode and the negative electrode of the power supply respectively; the first The liquid inlet end of the peristaltic pump is connected to the electrolysis chamber, and the liquid outlet end is connected to one end of the anode chamber, the other end of the anode chamber is connected to one end of the cathode chamber, and the other end of the cathode chamber is connected to the electrolysis chamber; the liquid inlet end of the second peristaltic pump is connected to the polysalt chamber, the liquid outlet end is connected to one end of the polysalt flow chamber, and the other end of the polysalt flow chamber is connected to the polysalt chamber; the liquid inlet end of the third peristaltic pump is connected to the desalination chamber, the liquid outlet end is connected to one end of the desalination flow chamber, and the other end of the desalination flow chamber is connected to the desalination chamber; the polysalt chamber and the desalination chamber are used to add mineralized water to be desalted, and the electrolysis chamber is used to add mineralized water to be desalted and electrolyte.

2. The desalination device for mineralized water based on electrical oxidation and reduction according to claim 1, characterized in that: The anode plate and the cathode plate are both made of an acrylic plate and graphite paper. One side of the graphite paper is fixed on the acrylic plate, and the other side is in sealing contact with the anode chamber or the cathode chamber.

3. The desalination device for mineralized water based on electrical oxidation and reduction according to claim 1, characterized in that: The cation exchange membrane CEM and the anion exchange membrane AEM are both monovalent ion exchange membranes.

4. A method for desalination of mineralized water, characterized in that: Desalination of mineralized water using the desalination device for mineralized water based on electrical oxidation reduction as described in any one of claims 1 to 3; wherein, using I - and as electrolyte; before desalination treatment, add the mineralized water to be desalted into the polysalt chamber and the desalination chamber respectively, add the mineralized water to be desalted and a mixed solution composed of iodine and sodium iodide or lithium iodide into the electrolysis chamber; connect the peristaltic pumps and turn on the power to generate an electric field between the anode plate and the cathode plate; during desalination treatment, In the cathode chamber, it is reduced to I - , I - Metal cations in the mineralized water are captured from the desalination stream by a CEM adjacent to the cathode chamber. - The captured metal cations enter the anode chamber through a peristaltic pump; in the anode chamber, I - Oxidized to Metal cations are released into the salt-accumulating flow chamber through the CEM adjacent to the anode chamber; anions in the mineralized water enter the salt-accumulating flow from the desalting flow through the AEM due to the electrical neutrality of the salt solution. The cycle is completed by migrating to the cathode chamber through the first peristaltic pump; this process allows the salt in the desalted stream to be continuously removed and enriched in the concentrated salt stream.

5. The method for desalination of mineralized water according to claim 4, characterized in that: Anion exchange membrane AEM and cation exchange membrane CEM use monovalent ion exchange membranes for sustainable magnesium and lithium separation in brine.

6. The method for desalination of mineralized water according to claim 5, characterized in that: The voltage applied by the power supply to the anode plate and the cathode plate is 0.6±0.05V.

7. The method for desalination of mineralized water according to claim 4, characterized in that: When the electrolyte is iodine and lithium iodide, the content of lithium iodide added to the electrolytic chamber is 0.5 mol / L, and the content of iodine added is 0.05 mol / L.

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