An electrodialysis device for extracting lithium from salt lake brine by using a two-dimensional channel membrane
By using staggered perforated grids to compress a two-dimensional nanomaterial electrodialysis membrane in an electrodialysis device, the problem of two-dimensional channel membrane swelling upon contact with water was solved, enabling efficient extraction of lithium from salt lake brine.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SDIC XINJIANG LUOBUPO POTASH CO LTD
- Filing Date
- 2022-11-17
- Publication Date
- 2026-06-23
AI Technical Summary
Existing electrodialysis devices struggle to overcome the problem of two-dimensional channel membranes swelling when exposed to water, leading to a significant decrease in transport and sieving performance and limiting their industrialization.
An electrodialysis membrane is constructed by stacking layers of two-dimensional nanomaterials. The membrane is then compressed by electrodialysis septa arranged in a staggered pattern of perforated grids, which restricts the liquid from passing through the membrane in a tortuous path and reduces the degree of expansion.
This effectively reduced the expansion of the two-dimensional channel membrane, maintaining its transport and sieving performance, and enabling efficient extraction of lithium from salt lake brine.
Smart Images
Figure CN115770482B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of lithium extraction membrane separation technology, and in particular to an electrodialysis device for lithium extraction from salt lake brine using a two-dimensional channel membrane. Background Technology
[0002] Electrodialysis is a type of membrane separation technology that can be used for the separation and purification of ions and molecules. Since most electrodialysis membranes on the market are organic polymer ion exchange membranes, conventional electrodialysis membranes are designed and optimized only for polymer-type membranes. In these membranes, the electrodialysis separator mainly serves as a support and for flow distribution.
[0003] Currently, all electrodialysis devices struggle to overcome the problem of two-dimensional channel membranes swelling upon contact with water. This change in membrane height after exposure to water significantly reduces their transport and sieving properties, hindering the industrialization of this type of membrane and limiting its widespread use. Two-dimensional channel membrane nanomaterials include graphene, molybdenum disulfide, MXene, and vermiculite.
[0004] Therefore, there is an urgent need to develop a new type of electrodialysis device that can resist the expansion of two-dimensional channel membranes. Summary of the Invention
[0005] The purpose of this invention is to provide an electrodialysis device for extracting lithium from salt lake brine using a two-dimensional channel membrane, thereby overcoming the problem of the two-dimensional channel membrane swelling when exposed to water.
[0006] To achieve the above objectives, embodiments of the present invention provide the following solutions:
[0007] An electrodialysis device for lithium extraction from salt lake brine using a two-dimensional channel membrane includes:
[0008] Electrodialysis membrane (2) has a channel structure for ion permeation;
[0009] The electrodialysis membrane (2) is composed of layers of stacked two-dimensional nanomaterials; the height of the channel structure is at the nanometer or sub-nanometer level; the electrodialysis membrane (2) is a two-dimensional channel film;
[0010] An electrodialysis separator (1) is used to separate the electrodialysis membrane (2); the electrodialysis membrane (2) is placed between the two electrodialysis separators (1);
[0011] The electrodialysis partition (1) includes:
[0012] A perforated grid (8) is used for:
[0013] The perforated grids (8) in two adjacent electrodialysis partitions (1) have their perforations evenly and alternately arranged to press the electrodialysis membrane (2) together.
[0014] The liquid is restricted to pass through the electrodialysis membrane (2) in a tortuous path.
[0015] Optionally, the electrodialysis partition (1) further includes:
[0016] Mesh mesh (7), used for:
[0017] Support the perforated grid (8);
[0018] To regulate the flow state of the liquid;
[0019] The frame body (6) is used to support the mesh-like partition (7).
[0020] Optionally, the frame body (6) has a liquid guiding hole (3), a water distribution hole (4), and a chamber hole (5);
[0021] The liquid guide hole (3) is used for the inflow and outflow of the liquid;
[0022] The chamber orifice (5) provides a site for the liquid to pass through the electrodialysis membrane (2);
[0023] The water distribution hole (4) is used to make the liquid entering the chamber hole (5) evenly distributed.
[0024] Optionally, the liquid guiding hole (3) is rectangular, elliptical or semi-elliptical; the spacing between two adjacent liquid guiding holes (3) is uniform; only one of the two adjacent liquid guiding holes (3) is connected to the water distribution hole (4).
[0025] Optionally, the water distribution hole (4) is straight or curved.
[0026] Optionally, the frame body (6) has a length of M millimeters and a width of N millimeters, where M and N are both positive integers.
[0027] Optionally, the mesh shape of the mesh (7) is square, circular or rhomboid.
[0028] Optionally, the perforations of the upper and lower perforated grids (8) in the same electrodialysis ...
[0029] Optionally, the perforated grid (8) has uniformly distributed perforations, with the perforation width being W1 and the length being W2; the width of the overlapping area of the perforated grid (8) in two adjacent electrodialysis partitions (1) is W3; wherein W1, W2 and W3 are all positive numbers.
[0030] According to specific embodiments provided by the present invention, the following technical effects are disclosed:
[0031] This invention provides an electrodialysis device for lithium extraction from brine in salt lakes using a two-dimensional channel membrane, comprising an electrodialysis separator 1, an electrodialysis membrane 2, and a perforated grid 8. The electrodialysis membrane 2 has a channel structure, allowing ions to pass through; it is composed of layers of stacked two-dimensional nanomaterials; the height of the channel structure is nanometer- or sub-nanometer-scale; the electrodialysis membrane 2 is a two-dimensional channel membrane; the electrodialysis separator 1 separates the electrodialysis membrane 2; the electrodialysis membrane 2 is placed between two electrodialysis separators 1; the perforated grid 8 in adjacent electrodialysis separators 1 has uniformly staggered perforations, and pressing the electrodialysis membrane 2 can reduce the degree of swelling of the two-dimensional channel membrane upon contact with water. The perforated grid 8 restricts the liquid from passing through the electrodialysis membrane 2 in a tortuous path.
[0032] Therefore, the electrodialysis device for lithium extraction in salt lake brine using a two-dimensional channel membrane provided in this embodiment of the invention solves the problem of the two-dimensional channel membrane swelling when exposed to water. Attached Figure Description
[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0034] Figure 1 This is a schematic diagram of the structure of an electrodialysis device for lithium extraction from salt lake brine using a two-dimensional channel membrane, provided in an embodiment of the present invention.
[0035] Figure 2 This is a schematic diagram of the structure of the electrodialysis partition provided in an embodiment of the present invention;
[0036] Figure 3 This is a schematic diagram of the structure of a two-dimensional channel thin film material for selective ion transport provided in an embodiment of the present invention;
[0037] Figure 4 This is a schematic diagram of the structure of the electrodialysis membrane material after assembly of an electrodialysis device for lithium extraction from salt lake brine using a two-dimensional channel membrane, provided in an embodiment of the present invention.
[0038] Figure 5 This is an enlarged structural diagram of the electrodialysis membrane material after assembly of an electrodialysis device for lithium extraction from salt lake brine using a two-dimensional channel membrane, as provided in an embodiment of the present invention.
[0039] Symbol explanation:
[0040] Electrodialysis partition-1, electrodialysis membrane-2, liquid guiding hole-3, water distribution hole-4, chamber hole-5, frame body-6, mesh-like partition-7, and perforated grid-8. Detailed Implementation
[0041] The structures and scenarios described in the embodiments of this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. As those skilled in the art will know, with the emergence of new scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.
[0042] It should be noted that, in this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.
[0043] The purpose of this invention is to provide an electrodialysis device for extracting lithium from salt lake brine using a two-dimensional channel membrane, in order to solve the problem of the two-dimensional channel membrane swelling when exposed to water.
[0044] Figure 1 An exemplary structure of the electrodialysis device for lithium extraction from brine in a salt lake using a two-dimensional channel membrane is shown above, including an electrodialysis partition 1, an electrodialysis membrane 2, and a perforated grid 8. The components are described in detail below:
[0045] Electrodialysis membrane 2 has a channel structure and is used for ion permeation.
[0046] Electrodialysis membrane 2 is composed of layers of stacked two-dimensional nanomaterials; the height of the channel structure is at the nanometer or sub-nanometer level; electrodialysis membrane 2 is a two-dimensional channel thin film.
[0047] In one example, due to the height limitation of the channel structure, under the driving force of an external electric field, ions or molecules of different sizes are selectively transported from the electrodialysis membrane 2, thus realizing the sieving and concentration functions of the electrodialysis membrane 2. Two-dimensional nanomaterials refer to sheet-like materials with nanoscale monolayers.
[0048] Electrodialysis separator 1 is used to separate electrodialysis membrane 2; electrodialysis membrane 2 is placed between two electrodialysis separators 1.
[0049] In one example, two electrodialysis partitions 1 are placed on the upper and lower sides of the electrodialysis membrane 2, respectively. The two adjacent electrodialysis partitions 1 have the same structure. By flipping one of them 180° up and down and assembling it with the electrodialysis membrane 2, a concentration chamber or a desalination chamber that can perform electrodialysis independently can be obtained.
[0050] The electrodialysis partition 1 includes a perforated grid 8.
[0051] The perforated grids 8 in two adjacent electrodialysis partitions 1 have uniformly staggered perforations that press the electrodialysis membrane 2 together.
[0052] Please see Figure 2 The perforations of the perforated grids 8 in two adjacent electrodialysis partitions 1 are not aligned, but are uniformly staggered, in order to compress the electrodialysis membrane 2 and restrict the liquid from passing through the electrodialysis membrane 2 in a tortuous path.
[0053] In summary, the perforated grids 8 in the two adjacent electrodialysis partitions 1 are not aligned, but are uniformly staggered. The overlapping part of the perforated grids 8 is to compress the electrodialysis membrane 2. After compressing the electrodialysis membrane 2, the change in the height of the two-dimensional channel membrane can be reduced, and the liquid can be restricted to pass through the electrodialysis membrane 2 in a tortuous path. This achieves the selective function of ions or molecules, thereby realizing sieving and concentration, and solving the problem of the two-dimensional channel membrane swelling when exposed to water.
[0054] Please see Figure 3 The electrodialysis partition 1 also includes: a frame body 6 and a mesh-like partition 7.
[0055] The mesh-like partition 7 is used to support the perforated grid 8, and the mesh-like partition 7 is used to regulate the flow state of the liquid.
[0056] In one example, the mesh-like separator 7 provides support, supporting the perforated grid 8. The mesh-like separator 7 regulates the flow state of the liquid, which can promote the full and rapid passage of the liquid through the electrodialysis membrane 2.
[0057] The frame body 6 is used to support the grid-like partition 7.
[0058] In one example, the frame body 6 provides support for the mesh-like partition 7.
[0059] Please see again Figure 3 The frame body 6 has a liquid guiding hole 3, a water distribution hole 4, and a chamber hole 5.
[0060] The liquid guide hole 3 is used for liquid inflow and outflow.
[0061] In one example, the liquid guiding holes 3 are located at both ends of the electrodialysis partition 1, and the adjacent liquid guiding holes 3 are evenly spaced.
[0062] The chamber orifice 5 provides a space for liquid to pass through the electrodialysis membrane 2.
[0063] In one example, the liquid flows in from the liquid guide hole 3 and then enters the chamber hole 5 for temporary storage, waiting to pass through the electrodialysis membrane 2.
[0064] The water distribution hole 4 is used to ensure that the liquid entering the chamber hole 5 is evenly distributed.
[0065] In one example, a mesh-like partition 7 and a perforated grid 8 are sequentially installed above and below the chamber opening 5. The chamber opening 5, the mesh-like partition 7, and the perforated grid 8 constitute a compartment.
[0066] The liquid guiding hole 3 is rectangular, elliptical, or semi-elliptical; the spacing between two adjacent liquid guiding holes 3 is uniform; only one of two adjacent liquid guiding holes 3 is connected to the water distribution hole 4.
[0067] In one example, those skilled in the art can flexibly design the shape of the liquid guiding hole 3, such as rectangular, elliptical, semi-elliptical, rhomboid, etc., which will not be elaborated here.
[0068] The water distribution holes 4 are either straight or curved.
[0069] In one example, those skilled in the art can flexibly design the shape of the water distribution hole 4, such as a straight line, a broken line, a curved line, etc., which will not be elaborated here.
[0070] The frame body 6 has a length of M millimeters and a width of N millimeters, where M and N are both positive integers.
[0071] In one example, those skilled in the art can flexibly design the value of M, such as 1500, 1600, 1650, etc., which will not be elaborated here. Those skilled in the art can flexibly design the value of N, such as 700, 800, 850, etc., which will not be elaborated here.
[0072] The mesh shape of the grid-like mesh 7 is square, circular, or rhomboid.
[0073] In one example, those skilled in the art can flexibly design the grid shape, such as square, circle, ellipse, rhombus, etc., which will not be elaborated here.
[0074] The perforations of the two perforated grids 8 in the same electrodialysis partition 1 are aligned with each other.
[0075] In one example, the perforations of the upper and lower perforated grids 8 in the same electrodialysis ...
[0076] Please see Figure 4 and Figure 5 The perforated grid 8 has uniformly distributed perforations, with a width of W1 and a length of W2. The width of the overlapping area of the perforated grid 8 in two adjacent electrodialysis partitions 1 is W3. Among them, W1, W2 and W3 are all positive numbers.
[0077] In one example, those skilled in the art can flexibly design the value of W1, such as 1mm, 5mm, 8mm, 9mm, etc., which will not be elaborated here. Those skilled in the art can flexibly design the value of W2, such as 5mm, 21mm, 24mm, etc., which will not be elaborated here. Those skilled in the art can flexibly design the value of W3, such as 2mm, 8mm, 9mm, 10mm, etc., which will not be elaborated here.
[0078] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0079] This document uses specific examples to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the embodiments above are only for the purpose of helping to understand the methods and core ideas of the embodiments of the present invention. At the same time, for those skilled in the art, there will be changes in specific implementation methods and application scope based on the ideas of the embodiments of the present invention. In summary, the content of this specification should not be construed as a limitation on the embodiments of the present invention.
Claims
1. An electrodialysis device for lithium extraction from salt lake brine using a two-dimensional channel membrane, characterized in that, include: Electrodialysis membrane (2) has a channel structure for ion permeation; The electrodialysis membrane (2) is composed of layers of stacked two-dimensional nanomaterials; the height of the channel structure is at the nanometer or sub-nanometer level; the electrodialysis membrane (2) is a two-dimensional channel film; An electrodialysis separator (1) is used to separate the electrodialysis membrane (2); The electrodialysis membrane (2) is placed between the two electrodialysis partitions (1); The electrodialysis partition (1) includes: A perforated grid (8) is used for: The perforated grids (8) in two adjacent electrodialysis partitions (1) have their perforations evenly and alternately arranged to press the electrodialysis membrane (2) together. The liquid is restricted to pass through the electrodialysis membrane (2) in a tortuous path; The electrodialysis partition (1) also includes: Mesh mesh (7), used for: Support the perforated grid (8); To regulate the flow state of the liquid; The frame body (6) is used to support the mesh-like partition (7).
2. The electrodialysis apparatus for lithium extraction from salt lake brine using a two-dimensional channel membrane according to claim 1, characterized in that, The frame body (6) has a liquid guiding hole (3), a water distribution hole (4) and a chamber hole (5); The liquid guide hole (3) is used for the inflow and outflow of the liquid; The chamber orifice (5) provides a site for the liquid to pass through the electrodialysis membrane (2); The water distribution hole (4) is used to make the liquid entering the chamber hole (5) evenly distributed.
3. The electrodialysis apparatus for lithium extraction from salt lake brine using a two-dimensional channel membrane according to claim 2, characterized in that, The liquid guiding hole (3) is rectangular, elliptical or semi-elliptical; the spacing between two adjacent liquid guiding holes (3) is uniform; only one of the two adjacent liquid guiding holes (3) is connected to the water distribution hole (4).
4. The electrodialysis apparatus for lithium extraction from salt lake brine using a two-dimensional channel membrane according to claim 2, characterized in that, The water distribution holes (4) are either straight or curved.
5. The electrodialysis apparatus for lithium extraction from salt lake brine using a two-dimensional channel membrane according to claim 2, characterized in that, The frame body (6) has a length of M millimeters and a width of N millimeters, where M and N are both positive integers.
6. The electrodialysis apparatus for lithium extraction from salt lake brine using a two-dimensional channel membrane according to claim 1, characterized in that, The mesh shape of the mesh (7) is square, circular or rhomboid.
7. The electrodialysis apparatus for lithium extraction from salt lake brine using a two-dimensional channel membrane according to claim 1, characterized in that, The perforations of the upper and lower perforated grids (8) in the same electrodialysis partition (1) are aligned with each other.
8. The electrodialysis apparatus for lithium extraction from salt lake brine using a two-dimensional channel membrane according to claim 1, characterized in that, The perforated grid (8) has uniformly distributed perforations, with a width of W1 and a length of W2. The width of the overlapping area of the perforated grid (8) in two adjacent electrodialysis partitions (1) is W3. Wherein, W1, W2 and W3 are all positive numbers.