Tesla flow channel coupled electrically controlled membrane separation device and method thereof

Abstract

The application discloses a Tesla flow channel coupled electric control membrane separation device and a method thereof, relates to the technical field of equipment design and ion separation and recovery, and comprises a positive plate arranged vertically and a negative plate attached to the positive plate; a plurality of groups of parallel Tesla flow channels are vertically arranged in the positive plate, and each adjacent Tesla flow channel is in communication with each other; a solution inlet is arranged above the positive plate, and a solution outlet is arranged below the positive plate; wherein the inner cavity of each Tesla flow channel is attached with a membrane material, and the separation and recovery of valuable metal cations in wastewater are realized by respectively applying reduction and oxidation potentials to the positive plate; the Tesla flow channel is applied to the electric control ion separation system, the designed flow channel can prolong the adsorption time of the waste liquid in the cavity, ensures the one-way flow of the solution, and thus improves the high separation efficiency of the electric control ion exchange device for valuable metal ions.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment design and ion separation and recovery, and in particular to a Tesla flow channel coupled electrically controlled membrane separation device and a method thereof. Background Art

[0002] In the field of wastewater treatment and ion resource recovery, how to recover valuable metal cations in wastewater at low cost has always received widespread attention.

[0003] As a new ion recovery technology, electrically controlled ion exchange (ESIX) technology regulates the oxidation / reduction potential of the membrane electrode and utilizes the electroneutrality principle of the membrane to achieve the insertion and release of target ions, thereby achieving selective and controllable separation of target ions and recycling of membrane materials (J.Mater.Chem.A,2014,2,10263-10272; Sep.Purif.Technol.2023,316,12377). - The application of removal and the Chinese invention patent (CN109502706B) involve the application of electrically controlled ion exchange technology in the removal of valuable metal ions.

[0004] In order to improve the efficiency of ESIX technology in separating valuable metal ions, an electrically controlled ion exchange separation system was developed. However, there are two problems with the planar flow channel of the separation system: (1) the waste liquid passes through the separation chamber quickly under gravity conditions, resulting in insufficient adsorption of the membrane material; (2) the waste liquid cannot be discharged from the chamber in time, resulting in waste liquid backflow, which in turn causes the separation speed of valuable ions to be slow and the separation efficiency to be low.

[0005] To solve the above problems, a variety of waste liquid treatment chambers have been designed, such as serpentine flow channels and parallel flow channels. However, none of them can effectively solve the problem of waste liquid backflow caused by the inability to discharge the waste liquid from the chamber in time, thereby resulting in slow separation speed and low separation efficiency of valuable ions. Summary of the Invention

[0006] In response to the deficiency of the prior art that waste liquid passes through the separation cavity quickly under gravity conditions, resulting in insufficient adsorption of membrane materials, the present invention proposes a Tesla flow channel coupled electrically controlled membrane separation device and a method thereof, applying the Tesla flow channel to the electrically controlled ion separation system. The designed flow channel can prolong the adsorption time of the waste liquid in the cavity, ensuring that the electrically controlled ion exchange device has a high separation efficiency for valuable metal ions, thereby solving the problem of insufficient adsorption of membrane materials due to waste liquid passing through the separation cavity in the prior art.

[0007] A Tesla flow channel coupled electrically controlled membrane separation device, comprising: a vertically placed positive electrode plate and a negative electrode plate bonded to the positive electrode plate;

[0008] A plurality of parallel Tesla flow channels are vertically opened in the positive electrode plate, and two adjacent Tesla flow channels are interconnected; a solution inlet is opened above the positive electrode plate, and a solution outlet is opened below the positive electrode plate;

[0009] Among them, each Tesla flow channel cavity is attached with a membrane material; by applying a reduction potential to the positive electrode plate, the valuable cations in the inflowing waste liquid are directionally adsorbed to the surface of the membrane material attached to the flow channel under the action of the electric field force formed by the positive electrode plate and the negative electrode plate, and the remaining waste liquid flows into the waste liquid recovery system in a unidirectional manner without backflow; by applying an oxidation potential to the positive electrode plate, the valuable cations adsorbed on the membrane material will be released into the regeneration liquid to obtain concentrated valuable metal cations, thereby realizing the separation and recovery of valuable metal cations in the wastewater.

[0010] Furthermore, the angle between two adjacent Tesla flow channels in the positive electrode plate is 25-85 degrees.

[0011] Furthermore, the multiple groups of Tesla flow channels in the positive electrode plate do not overlap with each other.

[0012] Furthermore, both the positive electrode plate and the negative electrode plate are equipped with double-sided insulating compression devices.

[0013] Furthermore, there are multiple positive plates, and the Tesla flow channels in two adjacent positive plates are placed in opposite directions, and the solution inlet of each positive plate is connected to the solution outlet of the adjacent positive plate.

[0014] Furthermore, a flexible contact sealing material is provided between two adjacent positive electrode plates.

[0015] Furthermore, a separation method of a Tesla flow channel coupled with an electrically controlled membrane separation device comprises the following steps:

[0016] The waste liquid enters the Tesla flow channel from the liquid inlet above the vertically placed positive plate;

[0017] By applying a reduction potential to the positive electrode, the valuable cations in the inflowing waste liquid are directionally adsorbed to the surface of the membrane material attached to the flow channel under the action of the electric field force, and the remaining waste liquid flows into the waste liquid recovery system in a unidirectional manner without backflow;

[0018] When an oxidation potential is applied to the positive plate, the valuable cations adsorbed on the membrane material will be released into the regeneration liquid to obtain concentrated valuable metal cations.

[0019] Furthermore, the waste liquid evenly enters the upper end of each Tesla flow channel from the solution inlet of the positive plate and flows in the flow channel at a uniform flow rate.

[0020] The present invention provides a Tesla flow channel coupled electrically controlled membrane separation device and method thereof, which has the following beneficial effects:

[0021] The present invention is designed to apply Tesla-type flow channels to an electrically controlled ion separation system. By vertically opening multiple parallel groups of Tesla flow channels in the positive electrode plate, each adjacent Tesla flow channel is interconnected, and a membrane material is attached to the inner cavity of each Tesla flow channel. By applying reduction and oxidation potentials to the positive electrode plate respectively, the separation and recovery of valuable metal cations in the wastewater are achieved; the designed flow channel can extend the adsorption time of the waste liquid in the cavity, ensuring that the electrically controlled ion exchange device has a high separation efficiency for valuable metal ions and is easy to industrialize; at the same time, the unidirectional flow characteristic of the flow channel can ensure that the waste liquid will not flow back, and the positive electrode with the Tesla flow channel can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a front view of a positive electrode plate containing a Tesla flow channel in an embodiment of the present invention;

[0023] Figure 2 A side view of a positive electrode plate containing a Tesla flow channel in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of assembling multiple separation units in an embodiment of the present invention;

[0025] Figure 4 Schematic diagram of the solution flow routes between different separation units in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] The present invention proposes an electrically controlled ion exchange device with Tesla channels, which mainly includes a positive electrode plate, on the inner side of which are opened multiple parallel groups of Tesla channels, with a liquid inlet on the top and a backflow port on the bottom, and adjacent Tesla channels are interconnected; a negative electrode plate, a double-sided insulating clamping device, as a separation unit, an external power supply, and the negative electrode of the plate isolates the liquid channels between different units; the double-sided insulating clamping device can be used to clamp independent units, and can also be used for clamping between multiple separation units to prevent liquid leakage, while preventing leakage of the electrically controlled membrane device during use.

[0028] The separation unit is coupled with the electrically controlled membrane separation system. A reduction potential is applied to the positive electrode plate. The waste liquid enters the positive electrode Tesla flow channel from the upper inlet. The valuable cations in the waste liquid are adsorbed on the surface of the membrane material coated in the flow channel under the action of the electric field force. Under the action of the Tesla flow channel, the waste liquid can enter the waste liquid recovery system in a one-way non-return flow, realizing efficient resource recovery of the valuable ions in the waste liquid. An oxidation potential is applied to the positive electrode plate. The metal cations adsorbed in the membrane material are quickly released into the regeneration liquid, and the concentrated valuable metal cations are obtained.

[0029] The electrochemical workstation controls the oxidation-reduction state of the positive and negative electrode plates. The positive electrode plate with the Tesla flow channel, the negative electrode plate and the double-sided insulation compression device are used as a separation unit. In actual application, a plurality of separation units can be connected in series to complete multi-stage recovery of the waste liquid. The flexible contact type sealing unit is arranged between the plurality of separation units.

[0030] Based on the same inventive concept, an application method of the Tesla flow channel coupled with the electrically controlled membrane separation device is provided, which comprises the following steps:

[0031] The waste liquid enters the Tesla flow channel from the liquid inlet above the vertically placed positive electrode plate.

[0032] By applying a reduction potential to the positive electrode plate, the valuable cations in the inflowing waste liquid are adsorbed on the surface of the membrane material attached in the flow channel under the action of the electric field force. The remaining waste liquid flows into the waste liquid recovery system in a one-way non-return flow.

[0033] An oxidation potential is applied to the positive electrode plate. The valuable cations adsorbed on the membrane material are released into the regeneration liquid, and the concentrated valuable metal cations are obtained.

[0034] The upper end of the Tesla flow channel is the large-resistance waste liquid flow end, which is arranged at the liquid inlet at the upper end of the device. The lower end is the small-resistance waste liquid flow end, which is arranged near the liquid outlet at the lower end. The waste liquid at the liquid inlet can uniformly enter the large-resistance end of each Tesla flow channel and move in the cavity at an equal flow rate. In the positive electrode plate with the Tesla flow channel, the Tesla flow channels are planar and penetrate each other. The Tesla flow channels are a plurality of groups of single-pole Tesla flow channels. The included angle between the two groups of single-pole Tesla flow channels is set to 25-85 degrees, which is used to improve the liquid resistance of the Tesla flow channel.

[0035] The electric-controlled membrane separation device is placed vertically. After the waste liquid enters the reaction chamber, the flow channel will flow out quickly under the action of gravity. The contact time with the membrane material on the surface of the chamber is insufficient. If the lower outlet cannot be removed in time, it will also cause the problem of waste liquid backflow. The selected Tesla flow channel uses the principle of dynamics to buffer the forward-flowing waste liquid and prolong the residence time in the reaction chamber; it creates resistance to the reverse-flowing waste liquid and prevents it from entering the chamber again; multiple groups of Tesla flow channels are arranged in parallel in the positive electrode of the plate, and are interconnected and do not overlap with each other. The angle between the flow channels is designed to be 25-85 degrees.

[0036] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A Tesla flow channel coupled electrically controlled membrane separation device, characterized in that: include: A vertically placed positive electrode plate and a negative electrode plate bonded to the positive electrode plate; The positive electrode plate is provided with multiple sets of parallel Tesla flow channels vertically, and two adjacent Tesla flow channels are interconnected; the multiple sets of Tesla flow channels in the positive electrode plate do not overlap with each other; a solution inlet is provided above the positive electrode plate, and a solution outlet is provided below the positive electrode plate; Among them, each Tesla flow channel cavity is attached with a membrane material; by applying a reduction potential to the positive electrode plate, the valuable cations in the inflowing waste liquid are directionally adsorbed to the surface of the membrane material attached to the flow channel under the action of the electric field force formed by the positive electrode plate and the negative electrode plate, and the remaining waste liquid flows into the waste liquid recovery system in a one-way direction without backflow. The flow channel can extend the adsorption time of the waste liquid in the cavity; by applying an oxidation potential to the positive electrode plate, the valuable cations adsorbed on the membrane material will be released into the regeneration liquid to obtain concentrated valuable metal cations, thereby realizing the separation and recovery of valuable metal cations in the wastewater.

2. A Tesla flow channel coupled electrically controlled membrane separation device according to claim 1, characterized in that: The angle between two adjacent flow channel branches in a group of Tesla flow channels in the positive electrode plate is 25-85 degrees.

3. The Tesla flow channel coupled electrically controlled membrane separation device according to claim 1, characterized in that: Double-sided insulating compression devices are installed on both the positive electrode plate and the negative electrode plate.

4. The Tesla flow channel coupled electrically controlled membrane separation device according to claim 1, characterized in that: There are multiple positive electrode plates, and the Tesla flow channels in two adjacent positive electrode plates are placed in opposite directions, and the solution inlet of each positive electrode plate is connected to the solution outlet of the adjacent positive electrode plate.

5. The Tesla flow channel coupled electrically controlled membrane separation device according to claim 4, characterized in that: A flexible contact sealing material is provided between two adjacent positive electrode plates.

6. A separation method based on the Tesla flow channel coupled electrically controlled membrane separation device according to claim 1, characterized in that: The following steps are involved: The waste liquid enters the Tesla flow channel from the liquid inlet above the vertically placed positive plate; By applying a reduction potential to the positive electrode, the valuable cations in the inflowing waste liquid are directionally adsorbed to the surface of the membrane material attached to the flow channel under the action of the electric field force, and the remaining waste liquid flows into the waste liquid recovery system in a unidirectional manner without backflow; When an oxidation potential is applied to the positive plate, the valuable cations adsorbed on the membrane material will be released into the regeneration liquid to obtain concentrated valuable metal cations.

7. The separation method of the Tesla flow channel coupled electrically controlled membrane separation device according to claim 6, characterized in that: The waste liquid evenly enters the upper end of each Tesla flow channel from the solution inlet of the positive plate and flows in the flow channel at a uniform flow rate.

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