Flow electrode capacitive deionization device and high-salinity mine water treatment system

Abstract

The application discloses a flow electrode capacitive deionization device and a high-salt mine water treatment system, and belongs to the technical field of high-salt mine water treatment, and aims to solve at least one problem that flow resistance of a flow electrode in the prior art is relatively large, and the flow resistance is prone to causing at least one of the following problems: the anode side flow channel of the anode side current collecting plate and the cathode side flow channel of the cathode side current collecting plate are blocked, and the distance between the anode side current collecting plate and the cathode side current collecting plate is too large to affect charge transfer efficiency. In the application, a treatment liquid inlet pipe and a treatment liquid outlet pipe are arranged on the end surface of a treatment liquid cavity plate and are in communication with the inner cavity of the treatment liquid cavity plate; an anode side flow electrode inlet pipe and an anode side flow electrode outlet pipe are arranged on the side edge surface of the anode side current collecting plate and are in communication with the anode side flow channel in the anode side current collecting plate; and a cathode side flow electrode inlet pipe and a cathode side flow electrode outlet pipe are arranged on the side edge surface of the cathode side current collecting plate and are in communication with the cathode side flow channel in the cathode side current collecting plate. The application can be used for treating high-salt mine water.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of high-salinity mine water treatment, and particularly relates to a flow electrode capacitive deionization device and a high-salinity mine water treatment system. BACKGROUND

[0002] Flow electrode capacitive deionization technology, referred to as FCDI technology, is an ion removal technology based on the principle of electrochemical reaction. The principle is to use electrodes to adsorb and remove ions in water, and at the same time, through the action of an external electric field, the ions are continuously circulated between the electrode plates, further enhancing the ion removal effect.

[0003] The existing flow electrode capacitive deionization device, as shown in Figure 1 , comprises an anode-side current collector plate, a treatment liquid cavity plate, a cathode-side current collector plate, a treatment liquid inlet pipe, a treatment liquid outlet pipe, an anode-side flow electrode inlet pipe, an anode-side flow electrode outlet pipe, a cathode-side flow electrode inlet pipe, and a cathode-side flow electrode outlet pipe. The anode-side current collector plate, the treatment liquid cavity plate, and the cathode-side current collector plate are stacked in order. The treatment liquid inlet pipe and the treatment liquid outlet pipe are respectively arranged on the side edge surface of the treatment liquid cavity plate and communicate with the inner cavity of the treatment liquid cavity plate. The anode-side flow electrode inlet pipe and the anode-side flow electrode outlet pipe are arranged on the end of the anode-side current collector plate away from the treatment liquid cavity plate and are perpendicular to the end surface of the anode-side current collector plate, and communicate with the anode-side flow channel in the anode-side current collector plate. The cathode-side flow electrode inlet pipe and the cathode-side flow electrode outlet pipe are arranged on the end of the cathode-side current collector plate away from the treatment liquid cavity plate and are perpendicular to the end surface of the cathode-side current collector plate, and communicate with the cathode-side flow channel in the cathode-side current collector plate.

[0004] The above structure has the following problems: on the one hand, the inlet and outlet directions of the anode-side flow electrode are perpendicular to the anode-side current collector plate, and the inlet and outlet directions of the cathode-side flow electrode are perpendicular to the cathode-side current collector plate, which results in a large flow resistance of the flow electrode, easily causing the anode-side flow channel of the anode-side current collector plate and the cathode-side flow channel of the cathode-side current collector plate to be blocked; on the other hand, the treatment liquid inlet pipe and the treatment liquid outlet pipe are arranged on the side edge surface of the treatment liquid cavity plate, which requires the treatment liquid cavity plate to have a certain thickness for accommodating the connection of the treatment liquid inlet pipe and the treatment liquid outlet pipe, resulting in a thicker treatment liquid cavity plate, a larger spacing between the anode-side current collector plate and the cathode-side current collector plate, and affecting the charge transfer efficiency, and further affecting the treatment efficiency. SUMMARY

[0005] In view of the above analysis, the present application aims to provide a flow electrode capacitive deionization device and a high-salinity mine water treatment system to solve at least one of the problems that the flow resistance of the flow electrode is large, easily causing the anode-side flow channel of the anode-side current collector plate and the cathode-side flow channel of the cathode-side current collector plate to be blocked, and the spacing between the anode-side current collector plate and the cathode-side current collector plate is too large to affect the charge transfer efficiency in the prior art.

[0006] The present application mainly aims at the following technical scheme.

[0007] The application provides a flow electrode capacitive deionization device, comprising an anode-side current collecting plate, a cation exchange membrane, a treatment liquid cavity plate, an anion exchange membrane and a cathode-side current collecting plate which are stacked in sequence; a treatment liquid inlet pipe and a treatment liquid outlet pipe are arranged on the end surface of the treatment liquid cavity plate and communicate with the inner cavity of the treatment liquid cavity plate; an anode-side flow electrode inlet pipe and an anode-side flow electrode outlet pipe are arranged on the side edge surface of the anode-side current collecting plate and communicate with the anode-side flow channel in the anode-side current collecting plate; and a cathode-side flow electrode inlet pipe and a cathode-side flow electrode outlet pipe are arranged on the side edge surface of the cathode-side current collecting plate and communicate with the cathode-side flow channel in the cathode-side current collecting plate.

[0008] Further, the anode-side current collecting plate and the cathode-side current collecting plate are graphite current collecting plates.

[0009] Further, the thickness ratio of the anode-side current collecting plate or the cathode-side current collecting plate to the treatment liquid cavity plate is 15-25:1.

[0010] Further, the application further comprises an anode-side end plate and a cathode-side end plate; the anode-side end plate is arranged on the side of the anode-side current collecting plate away from the cation exchange membrane, and the cathode-side end plate is arranged on the side of the cathode-side current collecting plate away from the anion exchange membrane.

[0011] Further, the anode-side end plate and the cathode-side end plate are organic glass end plates.

[0012] Further, the anode-side flow channel of the anode-side current collecting plate and the cathode-side flow channel of the cathode-side current collecting plate are both in a serpentine shape.

[0013] Further, the anode-side flow channel of the anode-side current collecting plate and the cathode-side flow channel of the cathode-side current collecting plate comprise a plurality of straight flow channels arranged in parallel and an arc-shaped flow channel connecting the heads and tails of two adjacent straight flow channels.

[0014] Further, the length of the straight flow channel is 55-65 mm.

[0015] Further, the height of the straight flow channel is 2.0-3.0 mm, and the depth is 1.5-2.5 mm.

[0016] The application further provides a high-salt mine well water treatment system comprising the flow electrode capacitive deionization device.

[0017] Compared with the prior art, the application can achieve at least one of the following beneficial effects.

[0018] A) The flow electrode capacitive deionization device provided by the application changes the original pipe arrangement mode, and the treatment liquid inlet pipe and the treatment liquid outlet pipe are arranged on the end surface of the treatment liquid chamber plate, so that the thickness of the treatment liquid chamber plate does not need to consider the treatment liquid inlet pipe and the treatment liquid outlet pipe, thereby greatly reducing the thickness of the treatment liquid chamber plate, and further reducing the distance between the anode side current collecting plate and the cathode side current collecting plate, and effectively improving the treatment efficiency.

[0019] B) The flow electrode capacitive deionization device provided by the application, the anode side flow electrode inlet pipe and the anode side flow electrode outlet pipe are arranged on the side surface of the anode side current collecting plate, and the cathode side flow electrode inlet pipe and the cathode side flow electrode outlet pipe are arranged on the side surface of the cathode side current collecting plate, the liquid inlet direction and the liquid outlet direction of the anode side flow electrode are parallel to the anode side current collecting plate, and the liquid inlet direction and the liquid outlet direction of the cathode side flow electrode are parallel to the cathode side current collecting plate, the flow resistance of the flow electrode is greatly reduced, and the blocking of the anode side flow channel of the anode side current collecting plate and the cathode side flow channel of the cathode side current collecting plate can be effectively reduced.

[0020] In the application, the above technical solutions can be combined with each other to realize more preferred combination solutions. Other features and advantages of the application will be described in the subsequent description, and some advantages will become apparent from the description, or will be understood by implementing the application. The purpose and other advantages of the application can be realized and obtained through the contents specifically indicated in the description, examples and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0022] Figure 1 A structure schematic diagram of a flow electrode capacitive deionization technology in the prior art;

[0023] Figure 2 A structure schematic diagram of a flow electrode capacitive deionization device provided by an embodiment of the application;

[0024] Figure 3 An exploded view of the flow electrode capacitive deionization device provided by the embodiment of the application;

[0025] Figure 4 A structure schematic diagram of a high-salt mine water treatment system provided by an embodiment of the application;

[0026] Figure 5 A structure schematic diagram of a water outlet pipe in the high-salt mine water treatment system provided by the embodiment of the application;

[0027] Figure 6aThe low-magnification scanning electron microscope image of H2O(g)-NaCl-HNO3 / CN in the high-salinity mine water treatment system provided by the second embodiment of the present application;

[0028] Figure 6b The high-magnification scanning electron microscope image of H2O(g)-NaCl-HNO3 / CN in the high-salinity mine water treatment system provided by the second embodiment of the present application;

[0029] Figure 7 The diagram of the change of the desalination amount of the system after seven adsorption-desorption cycles of the high-salinity mine water treatment system provided by the second embodiment of the present application.

[0030] Reference signs:

[0031] 1-anode flow electrode tank; 2-cathode flow electrode tank; 3-high-salinity mine water tank; 4-purified water tank; 5-flow electrode capacitive deionization device; 51-anode side end plate; 52-anode side current collector plate; 521-straight flow channel; 522-arc-shaped flow channel; 53-cation exchange membrane; 54-treatment liquid cavity plate; 55-anion exchange membrane; 56-cathode side current collector plate; 57-cathode side end plate; 58-treatment liquid inlet pipe; 59-treatment liquid outlet pipe; 510-anode side flow electrode inlet pipe; 511-anode side flow electrode outlet pipe; 512-cathode side flow electrode inlet pipe; 513-cathode side flow electrode outlet pipe; 514-gasket; 6-anode peristaltic pump; 7-cathode peristaltic pump; 8-mine water peristaltic pump; 9-conductivity meter; 10-power supply; 11-L-shaped mounting rod; 12-driving gear; 13-water outlet pipe; 131-first pipe body; 132-second pipe body; 133-flange; 14-driving rack; 15-pipe inner brush; 16-pipe outer brush. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present application will be described in detail below with reference to the drawings, which constitute a part of the present application, and are used to explain the principles of the present application, and are not used to limit the scope of the present application.

[0033] Embodiment one

[0034] This embodiment provides a flow electrode capacitive deionization device, which is described with reference to Figures 2 to 3, including an anode-side current collector plate 52 (for example, a graphite current collector plate), a cation exchange membrane 53, a treatment liquid cavity plate 54, an anion exchange membrane 55, a cathode-side current collector plate 56 (for example, a graphite current collector plate), a treatment liquid inlet pipe 58, a treatment liquid outlet pipe 59, an anode-side flow electrode inlet pipe 510, an anode-side flow electrode outlet pipe 511, a cathode-side flow electrode inlet pipe 512, and a cathode-side flow electrode outlet pipe 513, wherein the treatment liquid inlet pipe 58 and the treatment liquid outlet pipe 59 are respectively arranged on the end faces of the treatment liquid cavity plate 54 and communicate with the inner cavity of the treatment liquid cavity plate 54; the anode-side flow electrode inlet pipe 510 and the anode-side flow electrode outlet pipe 511 are arranged on the side edge faces of the anode-side current collector plate 52 and communicate with the anode-side flow channels in the anode-side current collector plate 52; and the cathode-side flow electrode inlet pipe 512 and the cathode-side flow electrode outlet pipe 513 are arranged on the side edge faces of the cathode-side current collector plate 56 and communicate with the cathode-side flow channels in the cathode-side current collector plate 56.

[0035] It should be noted that, for a plate-shaped structure, generally includes six faces, wherein the end faces refer to two relatively large planar faces, and the side edge faces refer to four relatively small planar faces connecting the two end faces.

[0036] Compared with the prior art, the flow electrode capacitive deionization device provided by the embodiment changes the original pipe arrangement mode. On the one hand, the treatment liquid inlet pipe 58 and the treatment liquid outlet pipe 59 are respectively arranged on the end faces of the treatment liquid cavity plate 54, and the thickness of the treatment liquid cavity plate 54 no longer needs to consider the treatment liquid inlet pipe 58 and the treatment liquid outlet pipe 59, thereby greatly reducing the thickness of the treatment liquid cavity plate 54, and further reducing the spacing between the anode-side current collector plate 52 and the cathode-side current collector plate 56, and effectively improving the treatment efficiency.

[0037] On the other hand, the anode-side flow electrode inlet pipe 510 and the anode-side flow electrode outlet pipe 511 are arranged on the side edge faces of the anode-side current collector plate 52, and the cathode-side flow electrode inlet pipe 512 and the cathode-side flow electrode outlet pipe 513 are arranged on the side edge faces of the cathode-side current collector plate 56. The liquid inlet direction and the liquid outlet direction of the anode-side flow electrode are both parallel to the anode-side current collector plate 52, and the liquid inlet direction and the liquid outlet direction of the cathode-side flow electrode are both parallel to the cathode-side current collector plate 56. The flow resistance of the flow electrode is greatly reduced, and the clogging of the anode-side flow channels of the anode-side current collector plate 52 and the cathode-side flow channels of the cathode-side current collector plate 56 can be effectively reduced.

[0038] In the prior art, the thickness ratio of the anode-side current collector plate 52 or the cathode-side current collector plate 56 to the treatment liquid cavity plate 54 is 1:1. In the embodiment, the thickness ratio of the anode-side current collector plate 52 or the cathode-side current collector plate 56 to the treatment liquid cavity plate 54 is 15-25:1 (for example, 20:1).

[0039] In order to improve the overall structural strength of the flow electrode capacitive deionization device, the flow electrode capacitive deionization device further comprises an anode side end plate 51 (for example, an organic glass end plate) and a cathode side end plate 57 (for example, an organic glass end plate), wherein the anode side end plate 51 is arranged on the side of the anode side current collector plate 52 away from the cation exchange membrane 53, and the cathode side end plate 57 is arranged on the side of the cathode side current collector plate 56 away from the anion exchange membrane 55. The plurality of plate bodies are clamped between the anode side end plate 51 and the cathode side end plate 57, so as to improve the overall structural strength of the flow electrode capacitive deionization device.

[0040] For the structure of the anode side flow channel of the anode side current collector plate 52 and the cathode side flow channel of the cathode side current collector plate 56, in order to reduce the flow resistance of the anode flow electrode and the cathode flow electrode, the shapes of both are serpentine, including a plurality of straight flow channels 521 arranged in parallel and an arc-shaped flow channel 522 connecting the heads of adjacent two straight flow channels 521. In this way, by arranging the arc-shaped flow channel 522, the cross-sectional area of the flow channel can be appropriately increased during the flow from the front straight flow channel 521 to the rear straight flow channel 521, the flow resistance of the anode flow electrode and the cathode flow electrode is reduced, and the plugging of the anode side flow channel of the anode side current collector plate 52 and the cathode side flow channel of the cathode side current collector plate 56 is greatly improved.

[0041] Exemplarily, the length of the straight flow channel 521 is 55-65 mm, the height is 2.0-3.0 mm, and the depth is 1.5-2.5 mm.

[0042] Example Two

[0043] This embodiment provides a high-salinity mine water treatment system, referring to Figure 4 , which comprises an anode flow electrode tank 1, a cathode flow electrode tank 2, a high-salinity mine water tank 3, a clean water tank 4, and a flow electrode capacitive deionization device 5. The flow electrode capacitive deionization device 5 is the flow electrode capacitive deionization device provided in Example One.

[0044] Among them, the anode flow electrode tank 1 and the anode side current collector plate 52 are in communication to form an anode flow electrode circulating loop, the cathode flow electrode tank 2 and the cathode side current collector plate 56 are in communication to form a cathode flow electrode circulating loop, and the high-salinity mine water tank 3, the treatment liquid cavity plate 54, and the clean water tank 4 are in communication in sequence to form a high-salinity mine water and clean water circulating loop.

[0045] In implementation, the anode flow electrode flows in the anode flow electrode circulation loop, the cathode flow electrode flows in the cathode flow electrode circulation loop, the mine water is supplied from the high-salt mine water tank 3 into the treatment liquid cavity plate 54, under the action of the electric field generated between the anode flow electrode and the cathode flow electrode, the cations enter the anode side flow channel of the anode side current collector plate 52 through the cation exchange membrane 53, and the anions enter the cathode side flow channel of the cathode side current collector plate 56 through the anion exchange membrane 55, so that the high-salt mine water becomes clean water and flows into the clean water tank 4, and the treatment of the high-salt mine water is completed.

[0046] Compared with the prior art, the high-salt mine water treatment system provided in the embodiment adopts the flow electrode capacitive deionization device 5 (i.e., the FCDI assembly), in the process of treating the high-salt mine water, the high-salt mine water, the anode flow electrode and the cathode flow electrode are always in a flowing state, the uninterrupted treatment of the high-salt mine water effectively improves the treatment efficiency of the high-salt mine water, so that the high-salt mine water can be treated for a long time and in large quantities, and at the same time, because the anode side current collector plate 52 can continuously adsorb cations to reduce the concentration of cations in the anode flow electrode, and the cathode side current collector plate 56 can continuously adsorb anions to reduce the concentration of anions in the cathode flow electrode, the removal effect of ions can be enhanced.

[0047] In order to be able to seal and buffer between each component, the above-mentioned high-salt mine water treatment system further comprises a gasket 514 (for example, a silica gel gasket 514), which is respectively arranged between the anode side end plate 51 and the anode side current collector plate 52, between the anode side current collector plate 52 and the cation exchange membrane 53, between the cation exchange membrane 53 and the treatment liquid cavity plate 54, between the treatment liquid cavity plate 54 and the anion exchange membrane 55, between the anion exchange membrane 55 and the cathode side current collector plate 56, and between the cathode side current collector plate 56 and the cathode side end plate 57.

[0048] It can be understood that in order to be able to promote the flow of the anode flow electrode, the connecting pipeline between the above-mentioned anode flow electrode tank 1 and the anode side current collector plate 52 is provided with an anode peristaltic pump 6, which provides the flow power of the anode flow electrode.

[0049] Similarly, in order to be able to promote the flow of the cathode flow electrode, the connecting pipeline between the above-mentioned cathode flow electrode tank 2 and the cathode side current collector plate 56 is provided with a cathode peristaltic pump 7, which provides the flow power of the cathode flow electrode.

[0050] In order to be able to promote the flow of the high-salt mine water, the connecting pipeline between the above-mentioned high-salt mine water tank 3 and the treatment liquid cavity plate 54 is provided with a mine water peristaltic pump 8, which provides the flow power of the high-salt mine water.

[0051] In order to be able to know the salt concentration of the mine water in the high-salt mine water tank 3 in real time, the above-mentioned high-salt mine water treatment system further comprises an electric conductivity meter 9, the detection end of the electric conductivity meter 9 is inserted into the liquid surface of the mine water in the high-salt mine water tank 3, and the electric conductivity change of the high-salt mine water is detected in real time, so as to know the salt concentration change thereof.

[0052] It can be understood that in order to be able to form an electric field, the above-mentioned high-salt mine water treatment system further comprises a power supply 10 (for example, a 1.2V direct current power supply 10), the positive electrode of the power supply 10 is connected with the anode side bus bar 52 and / or the anode side end plate 51, and the negative electrode of the power supply 10 is connected with the cathode side bus bar 56 and / or the cathode side end plate 57.

[0053] It is worth noting that some impurities will inevitably exist in the high-salt mine water, which is easy to cause the blockage of the outlet pipe of the high-salt mine water tank, but since the outlet pipe extends to below the liquid surface of the high-salt mine water, if cleaning is needed, the treatment of the high-salt mine water needs to be paused, and the process is complex. In the embodiment, the outlet pipe 13 is a telescopic pipe, that is, it comprises a first pipe body 131 and a second pipe body 132, the second pipe body 132 is sleeved on the outer wall of the first pipe body 131 and is in slidable sealing connection with the first pipe body 131, the first pipe body 131 is located outside the tank body of the high-salt mine water tank, the second pipe body 132 is located inside the tank body of the high-salt mine water tank, and the flange 133 is located outside the tank body of the high-salt mine water tank.

[0054] The above-mentioned high-salt mine water treatment system further comprises a dredging assembly, the dredging assembly comprises an in-pipe brush 15, the brush rod end of the in-pipe brush 15 is fixedly connected with the first pipe body 131, the brush end of the in-pipe brush 15 protrudes into the second pipe body 132, the bristles of the in-pipe brush 15 are in contact with the inner wall of the second pipe body 132, and see Figure 5 In this way, the operator can move the flange 133 back and forth, so that the second pipe body 132 moves relative to the first pipe body 131, and the in-pipe brush 15 can brush the inner wall of the second pipe body 132.

[0055] In order to be able to brush the water inlet end of the outlet pipe, the above dredging assembly further comprises an outer pipe brush 16, a driving rack 14, a driving gear 12 and an L-shaped mounting rod 11, the driving rack 14 is arranged on the outer wall of the second pipe body 132, the driving gear 12 is vertically engaged with the driving rack 14, one end of the L-shaped mounting rod 11 is fixedly connected with the driving gear 12, the other end of the L-shaped mounting rod 11 is fixedly connected with the brush rod end of the outer pipe brush 16, and the other end of the outer pipe brush 16 is located below the water inlet end of the outlet pipe and the outer pipe brush 16 is in contact with the water inlet end of the outlet pipe. In this way, when the second pipe body 132 reciprocates up and down, the rack reciprocates up and down, and then the driving gear 12 rotates and the L-shaped mounting rod 11 oscillates, so that the outer pipe brush 16 reciprocates relative to the water inlet end of the outlet pipe, and the water inlet end of the outlet pipe is brushed.

[0056] For the anode flow electrode and the cathode flow electrode, both are composed of the same, and each includes 2-5% of the porous carbon-based electrode material and 0.5-1.2% of the superconducting carbon black by mass percentage, and the rest is 1 g / L of NaCl solution.

[0057] The porous carbon-based electrode material is prepared by the following method:

[0058] Step 1: Put sucrose, melamine, potassium chloride and sodium chloride (mass ratio of 1:1.8-2.1:1.8-2.1:1.8-2.1) into an agate mortar and grind for 1.0-1.5 hours to obtain a uniformly mixed powder;

[0059] Step 2: Put the mixed powder into a porcelain boat and place the porcelain boat in a tube furnace for heating and holding. The temperature rising process is as follows: from room temperature to 220-280℃ for 1-2 hours of pre-activation, then to 650-750℃ for 1.5-2.5 hours of holding, and the temperature rising rate is 8-11℃ / min. Water vapor is introduced for surface etching during the holding process (when water vapor is introduced, the front end of the pipeline is wrapped with quartz wool to prevent water vapor from condensing and liquefying too early). The flow rate of water vapor is 0.8-1.1 g / min, and a carbon-based material (i.e. H2O(g)-NaCl / CN material) is obtained.

[0060] Step 3: After the carbon-based material is cooled to room temperature, it is washed with deionized water to remove the residual potassium chloride and sodium chloride in the carbon-based material;

[0061] Step 4: The cleaned carbon-based material is stirred and soaked in concentrated nitric acid (mass concentration of 50-65%) for 8-12 hours. After filtration and separation, the solid part is washed to neutral with deionized water and dried in a 70-80℃ oven for 20-24 hours to obtain a porous carbon-based electrode material (H2O(g)-NaCl-HNO3 / CN).

[0062] By using this preparation method, sucrose is used as a carbon source, melamine is used as a nitrogen source, and potassium chloride and sodium chloride are used as template agents. On the one hand, the introduction of nitrogen atoms into the carbon matrix not only increases the defect states of the carbon-based material, but also adjusts the electronic structure of the porous carbon-based electrode material by forming C-N bonds to provide more transmission channels for electrons, significantly improving the electrical conductivity of the porous carbon-based electrode material. High electrical conductivity can accelerate the transmission rate of electrons in the flowing electrode, thereby improving the reaction rate and overall performance of the flowing electrode. On the other hand, at high temperatures, the interaction between water vapor and the carbon-based material effectively removes disordered carbon and volatile impurities in the carbon-based material. At the same time, abundant microporous and mesoporous structures are generated. These porous structures not only increase the specific surface area of the porous carbon-based electrode material, providing more active sites for electrochemical reactions, but also improve the transmission path of ions and electrons, reducing transmission impedance. At the same time, the porous structure helps to buffer the volume expansion of the flowing electrode during the charging and discharging process, improving the structural stability of the flowing electrode. On the other hand, nitric acid activation can introduce oxygen-containing functional groups such as hydroxyl, carboxyl, and carbonyl groups onto the surface of the carbon-based material. These functional groups can increase the surface polarity of the porous carbon-based electrode material. At the same time, the acid washing process generates microporous and nanoscale gap structures on the surface of the carbon-based material, thereby increasing its specific surface area and helping to improve the adsorption capacity.

[0063] The porous carbon-based electrode material was prepared according to the following process parameters:

[0064] (1) Sucrose, melamine, potassium chloride, and sodium chloride were weighed at 10 g, 20 g, 20 g, and 20 g, respectively, and placed in a marquetry mortar for grinding. After 1 hour of thorough grinding, a uniformly mixed sample was obtained. The mixed sample was placed in a porcelain boat and placed in a tube furnace. The tube furnace program was set to pre-activate at a temperature of 280°C for 1 hour, then increase to 750°C for 2 hours, with a heating rate of 10°C / min. During the holding process, water vapor was introduced to etch the surface of the material, with a water vapor flow rate of 1 g / min. After the carbonization process, the H2O(g)-NaCl / CN was removed and the residual salt in the material was washed away with deionized water until the conductivity of the filtrate was less than 5 μm / cm.

[0065] (2) The H2O(g)-NaCl / CN was stirred and soaked in 50% nitric acid for 12 hours. After soaking, the sample was filtered and washed with deionized water until it was neutral. The sample was then dried in an 80°C oven for 24 hours to obtain H2O(g)-NaCl-HNO3 / CN.

[0066] The electron microscope image of the prepared H2O(g)-NaCl-HNO3 / CN microstructure is shown in Figure 6a and Figure 6b The material presents a large number of hierarchical pores and a unique and orderly arranged reticular honeycomb structure, and the surface of the material is evenly distributed with a large amount of C, N, and O elements.

[0067] The variation of the system desalination amount of the high-salt well water treatment method of the present application after seven adsorption-desorption cycles is shown in Figure 7 The desalination retention rate thereof after seven cycles can still reach 95.71%, which shows that the material has good regeneration and stable cyclic use performance.

[0068] The above description is merely preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A system for treating high-salinity mine water, characterized by, The application relates to a high-salt mine well water treatment system, which comprises an anode flow electrode tank, a cathode flow electrode tank, a high-salt mine well water tank, a clean water tank and a flow electrode capacitor deionization device; the flow electrode capacitor deionization device comprises an anode side current collecting plate, a cation exchange film, a treatment liquid cavity plate, an anion exchange film and a cathode side current collecting plate which are stacked in sequence; treatment liquid inlet pipes and treatment liquid outlet pipes are arranged on the end faces of the treatment liquid cavity plate and are communicated with the inner cavities of the treatment liquid cavity plate; an anode side flow electrode inlet pipe and an anode side flow electrode outlet pipe are arranged on the side edge faces of the anode side current collecting plate and are communicated with anode side flow channels in the anode side current collecting plate; a cathode side flow electrode inlet pipe and a cathode side flow electrode outlet pipe are arranged on the side edge faces of the cathode side current collecting plate and are communicated with cathode side flow channels in the cathode side current collecting plate; The anode flow electrode tank and the anode side current collecting plate are communicated to form an anode flow electrode circulating loop, the cathode flow electrode tank and the cathode side current collecting plate are communicated to form a cathode flow electrode circulating loop, and the high-salt mine well water tank, the treatment liquid cavity plate and the clean water tank are communicated in sequence to form a high-salt mine well water and clean water circulating loop; The water outlet pipe of the high-salt mine well water tank comprises a first pipe body and a second pipe body, the second pipe body is sleeved on the outer wall of the first pipe body and is in slidable sealing connection with the first pipe body, the first pipe body is located outside the tank body of the high-salt mine well water tank, one end of the second pipe body close to the first pipe body is provided with a flange, the second pipe body is located in the tank body of the high-salt mine well water tank, and the flange is located outside the tank body of the high-salt mine well water tank; the high-salt mine well water treatment system further comprises a dredging assembly, the dredging assembly comprises an inner pipe brush, an outer pipe brush, a driving rack, a driving gear and an L-shaped mounting rod, the brush rod end of the inner pipe brush is fixedly connected with the first pipe body, the brush end of the inner pipe brush protrudes into the second pipe body, and the bristles of the inner pipe brush are in contact with the inner wall of the second pipe body; the driving rack is arranged on the outer wall of the second pipe body, the driving gear is in perpendicular engagement with the driving rack, one end of the L-shaped mounting rod is fixedly connected with the driving gear, the other end of the L-shaped mounting rod is fixedly connected with the brush rod end of the outer pipe brush, and the other end of the outer pipe brush is located below the water inlet end of the water outlet pipe and is in contact with the water inlet end of the water outlet pipe.

2. The high-salinity mine water treatment system of claim 1, wherein, The anode side current collecting plate and the cathode side current collecting plate are graphite current collecting plates.

3. The high-salinity mine water treatment system of claim 1, wherein, The thickness ratio of the anode side current collecting plate or the cathode side current collecting plate to the treatment liquid cavity plate is 15-25:

1.

4. The high-salinity mine water treatment system of claim 1, wherein, Anode side end plates and cathode side end plates are further arranged; The anode side end plates are arranged on the side of the anode side current collecting plate away from the cation exchange film, and the cathode side end plates are arranged on the side of the cathode side current collecting plate away from the anion exchange film.

5. The high-salinity mine water treatment system of claim 4, wherein, The anode side end plates and the cathode side end plates are organic glass end plates.

6. The high-salinity mine water treatment system of claim 1, wherein, The anode side flow channels of the anode side current collecting plate and the cathode side flow channels of the cathode side current collecting plate are all in a snakelike shape.

7. The high-salinity mine water treatment system of claim 6, wherein, The anode side flow channels of the anode side current collecting plate and the cathode side flow channels of the cathode side current collecting plate comprise a plurality of straight flow channels arranged in parallel and arc flow channels connecting the first ends and the second ends of two adjacent straight flow channels.

8. The high-salinity mine water treatment system of claim 7, wherein, The length of the straight flow channels is 55-65 mm.

9. The high-salinity mine water treatment system of claim 8, wherein, The height of the straight flow channels is 2.0-3.0 mm, and the depth is 1.5-2.5 mm.

Images