Separation method and separation device for heavy metal ions in aqueous solution

Abstract

Embodiments of the present invention disclose a method and a device for separating heavy metal ions in an aqueous solution. The separation method includes: arranging a columnar electrode as the negative electrode at the central part of a cylinder, and arranging a cylindrical electrode as the positive electrode around the columnar electrode; forming an annular channel between the negative electrode and the positive electrode, disposing the aqueous solution in the annular channel and circulating it in the annular channel; connecting the negative electrode and the positive electrode to an external power source respectively to form an electric field radially distributed from the negative electrode to the positive electrode in the annular channel; the heavy metal ions in the aqueous solution circulating in the annular channel flow at a specific characteristic radius under the action of the electric field; the same heavy metal ions are enriched in the same characteristic radius region; collecting the aqueous solution containing the enriched heavy metal ions in the set characteristic radius region to achieve the separation of heavy metal ions. It has good application prospects in the fields of separation and detection of metal mixtures, treatment of heavy metal sewage, treatment of nuclear wastewater, etc.

Description

Technical Field

[0001] The present invention belongs to the technical field of water treatment, and particularly relates to a method and a device for separating heavy metal ions in an aqueous solution. Background Art

[0002] Heavy metal elements are difficult to degrade, easy to accumulate, and highly toxic, and are likely to cause irreversible pollution and harm to the environment, animals, plants, and humans. This has become a major problem worldwide. Metal ions are widely present in various water bodies. Separating and removing heavy metal ions from water often requires a cumbersome treatment process and high energy consumption.

[0003] Therefore, treating an aqueous solution containing heavy metal ions and collecting heavy metal ions in the aqueous solution have always been one of the technical difficulties in this field. Summary of the Invention

[0004] In view of this, on the one hand, some embodiments disclose a method for separating heavy metal ions in an aqueous solution. The separation method includes:

[0005] Providing a columnar electrode as the negative electrode, and providing a cylindrical electrode as the positive electrode around the columnar electrode;

[0006] Forming an annular channel between the negative electrode and the positive electrode, disposing the aqueous solution in the annular channel, and circulating the aqueous solution in the annular channel;

[0007] Connecting the negative electrode and the positive electrode to an external power source respectively to form a radially distributed electric field from the negative electrode to the positive electrode in the annular channel;

[0008] Heavy metal ions in the aqueous solution circulating in the annular channel flow at a specific characteristic radius under the action of the electric field;

[0009] The same heavy metal ions are enriched in the same characteristic radius region;

[0010] Collecting the aqueous solution containing the enriched heavy metal ions in the set characteristic radius region to achieve the separation of heavy metal ions.

[0011] Further, in the method for separating heavy metal ions in an aqueous solution disclosed in some embodiments, the characteristic radius is expressed as:

[0012] R = (q / m)·(E / ω 2 )

[0013] wherein, q / m is the charge-mass ratio of the heavy metal ions, ω is the moving angular velocity of the heavy metal ions, E is the electric field strength at the position where the heavy metal ions are located, R is the characteristic radius, and is the distance between the heavy metal ions and the central axis of the negative electrode.

[0014] The separation method of heavy metal ions in an aqueous solution disclosed in some embodiments, where the columnar electrode is a cylindrical conductor.

[0015] On the other hand, some embodiments disclose a separation device for heavy metal ions in an aqueous solution, the separation device comprising:

[0016] A cylinder for holding the aqueous solution;

[0017] A negative electrode, arranged as a columnar electrode, disposed in the cylinder for holding the aqueous solution;

[0018] A stirring assembly, adaptively arranged with the cylinder for holding the aqueous solution, for stirring the aqueous solution;

[0019] Wherein, the inner wall of the cylinder for holding the aqueous solution is made of a conductive material, and this conductive material serves as the positive electrode.

[0020] Furthermore, for the separation device of heavy metal ions in an aqueous solution disclosed in some embodiments, the separation device further comprises:

[0021] An aqueous solution extraction pipeline, adaptively arranged between the negative electrode and the positive electrode, for extracting the aqueous solution enriched with heavy metal ions.

[0022] For the separation device of heavy metal ions in an aqueous solution disclosed in some embodiments, the setting position of the aqueous solution extraction pipeline is determined according to the characteristic radius of the heavy metal ions, and the characteristic radius is expressed as:

[0023] R = (q / m)·(E / ω 2 )

[0024] Wherein, q / m is the charge-to-mass ratio of the heavy metal ions, ω is the movement angular velocity of the heavy metal ions, E is the electric field strength at the position where the heavy metal ions are located, R is the characteristic radius, and is the distance between the heavy metal ions and the central axis of the negative electrode.

[0025] For the separation device of heavy metal ions in an aqueous solution disclosed in some embodiments, the conductive material on the inner wall of the cylinder for holding the aqueous solution is separated from the inner wall to form an independently arranged concentric circular sleeve, and this concentric circular sleeve serves as the positive electrode.

[0026] For the separation device of heavy metal ions in an aqueous solution disclosed in some embodiments, the stirring assembly comprises:

[0027] Stirring blades, arranged inside the cylinder for holding the aqueous solution, between the negative electrode and the positive electrode;

[0028] A stirring motor, arranged outside the cylinder for holding the aqueous solution, and arranged to be connected to the stirring blades.

[0029] The separation device for heavy metal ions in an aqueous solution disclosed in the embodiments of the present invention can enrich and separate heavy metal ions from the aqueous solution. In the enrichment and separation process, the movement law of heavy metal ions in a radial electric field is utilized to enrich heavy metal ions in a specific region in the electric field, and then the aqueous solution in the specific region is collected to separate the aqueous solution enriched with heavy metal ions from the original aqueous solution, thereby realizing the separation of heavy metal ions. For different heavy metal ions, they can be collected in different specific regions to achieve the separation of multiple heavy metal ions. The device and method are simple, easy to operate, have low energy consumption, and can operate continuously, and have good application prospects in the fields of metal mixture separation and detection, heavy metal sewage treatment, nuclear wastewater treatment, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the composition of the separation device for heavy metal ions in an aqueous solution in Example 1;

[0031] Figure 2 Schematic diagram of the separation process of heavy metal ions in an aqueous solution in Example 2.

[0032] REFERENCE SIGNS

[0033] 1 Aqueous solution holding cylinder 2 Negative electrode

[0034] 3 Positive electrode 4 Stirring blade

[0035] 5 Stirring motor 6 Electrode mounting support

[0036] 7 Bottom plate 100 Aqueous solution DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The special term "embodiment" used herein does not necessarily mean better or superior to other embodiments as described by "exemplary". For the performance index tests in the embodiments of the present invention, unless otherwise specified, the conventional test methods in the art are adopted. It should be understood that the terms described in the embodiments of the present invention are only used to describe specific embodiments and are not used to limit the content disclosed in the embodiments of the present invention.

[0038] Unless otherwise specified, the technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the embodiments of the present invention belong; other test methods and technical means not specifically noted in the embodiments of the present invention refer to the experimental methods and technical means commonly adopted by those of ordinary skill in the art.

[0039] As used herein, the terms "substantially" and "about" are used to describe minor fluctuations. For example, they can refer to less than or equal to ±5%, such as less than or equal to ±2%, such as less than or equal to ±1%, such as less than or equal to ±0.5%, such as less than or equal to ±0.2%, such as less than or equal to ±0.1%, such as less than or equal to ±0.05%. Numerical data represented or presented herein in a range format is used only for convenience and brevity and should therefore be interpreted flexibly as including not only the values explicitly listed as the bounds of the range but also all individual values or sub-ranges included within that range. For example, a numerical range of "1 to 5%" should be interpreted as including not only the explicitly listed values of 1% to 5% but also the individual values and sub-ranges within the indicated range. Thus, individual values such as 2%, 3.5%, and 4% and sub-ranges such as 1% to 3%, 2% to 4%, and 3% to 5% etc. are included within this numerical range. This principle also applies to ranges that list only one numerical value. In addition, such an interpretation applies regardless of the width of the range or the characteristics described.

[0040] As used herein, including in the claims, conjunctions such as "comprising", "including", "carrying", "having", "containing", "involving", "accommodating", etc. are understood to be open-ended, that is, meaning "including but not limited to". Only the conjunctions "consisting of" and "composed of" are closed conjunctions.

[0041] To better illustrate the content of the present invention, numerous specific details are given in the following specific embodiments. Those skilled in the art should understand that the present invention can also be implemented without some of these specific details. In the embodiments, some methods, means, instruments, devices, etc. well-known to those skilled in the art are not described in detail in order to highlight the gist of the present invention.

[0042] On the premise of no conflict, the technical features disclosed in the embodiments of the present invention can be combined arbitrarily, and the obtained technical solutions belong to the content disclosed in the embodiments of the present invention.

[0043] In some embodiments, some embodiments disclose a method for separating heavy metal ions in an aqueous solution, and the separation method includes:

[0044] A columnar electrode is set as the negative electrode, and a cylindrical electrode is set around the columnar electrode as the positive electrode;

[0045] An annular channel is formed between the negative electrode and the positive electrode, the aqueous solution is arranged in the annular channel, and circulates in the annular channel;

[0046] The negative electrode and the positive electrode are respectively connected to an external power source to form an electric field radially distributed from the negative electrode to the positive electrode in the annular channel;

[0047] Heavy metal ions in the aqueous solution circulating in the annular channel flow at a specific characteristic radius under the action of an electric field;

[0048] The same heavy metal ions are enriched in the same characteristic radius region;

[0049] Collect the aqueous solution containing the enriched heavy metal ions in the set characteristic radius region to achieve the separation of heavy metal ions.

[0050] After the positive electrode and the negative electrode are respectively connected to an external power source, an electric field is formed between the electrodes, and the electric field is radially distributed from the negative electrode to the positive electrode; when the aqueous solution circulates in the annular channel between the positive electrode and the negative electrode, the flow direction is always perpendicular to the electric field direction; the heavy metal ions in the aqueous solution can be considered to do circular motion when circulating in the annular channel, and the heavy metal ions in circular motion are affected by two forces in the horizontal direction: electric field force and centrifugal force.

[0051] Among them, the electric field force depends on the electric field strength and the charge number of heavy metal ions, and the formula is as follows:

[0052] F 电场 =E·q…………(1)

[0053] In formula (1):

[0054] F 电场 is the electric field force, E is the electric field strength, and q is the electric charge quantity;

[0055] The centrifugal force depends on the radius of circular motion, centripetal acceleration, and ion mass, and the formula is as follows:

[0056] F 离心 =a·m…………(2)

[0057] In formula (2):

[0058] F 离心 is the centrifugal force, a is the centripetal acceleration, and m is the heavy metal ion mass;

[0059] Among them, the formula for the centripetal acceleration a is as follows:

[0060] a=ω 2 ·r…………(3)

[0061] In formula (3):

[0062] a is the centripetal acceleration, ω is the angular velocity of circular motion, and r is the radius of circular motion;

[0063] Heavy metal ions are positively charged particles that move in a circular motion in a circular channel. The center of the electric field distributed in the circular channel is the negative electrode of the electric field, and the outer wall of the channel is the positive electrode of the electric field. The negative electrode of the electric field has an attractive force on metal ions, and the positive electrode of the electric field has a repulsive force on metal ions. The sum of the attractive force and the repulsive force is the electric field force; when metal ions move in a circular motion, they are subject to a centrifugal force, the direction of which is opposite to the electric field force.

[0064] When the electric field force and the centrifugal force acting on the heavy metal ions are equal in magnitude, the heavy metal ions move in a stable circular motion, and their angular velocity ω and radius of motion R remain stable. That is:

[0065] When F 电场 = F 离心 ,

[0066] E·q = a·m, where a = ω 2 ·R

[0067] So: E·q = m·ω 2 ·R

[0068] Then: R = (q / m)·(E / ω 2 )…………(4)

[0069] In formula (4):

[0070] q / m is the charge-to-mass ratio of heavy metal ions, ω is the angular velocity of motion of heavy metal ions, E is the electric field strength at the position of heavy metal ions, R is the radius of motion, and is the distance between the heavy metal ions and the central axis of the negative electrode, which can be used as the characteristic radius of heavy metal ions;

[0071] For specific heavy metal ions, their charge-to-mass ratio q / m is a definite characteristic constant. If the aqueous solution makes a stable rotational motion, it can be approximately considered that the angular velocity ω of each part of the solution is the same. Therefore, the radius of motion r of heavy metal ions depends on the electric field strength E. When the electric field is uniform and the electric field strength E is approximately the same, the radius of motion of specific metal ions tends to be definite and has a specific radius of motion, which can be called the characteristic radius of the heavy metal ions. Different heavy metal ions have different characteristic radii.

[0072] In aqueous solutions, common heavy metal ions include ions of metals such as copper, lead, zinc, iron, cobalt, nickel, manganese, cadmium, mercury, tungsten, molybdenum, gold, and silver, all of which have different charge-to-mass ratios. For example, calculating the charge-to-mass ratio based on the ratio of the number of charges of the ion to the atomic weight, the charge-to-mass ratio of Cu +2 is 0.024, the charge-to-mass ratio of Ag +1 is 0.0093, the charge-to-mass ratio of Au +1 is 0.0051, the charge-to-mass ratio of Zn 2+ is 0.031, the charge-to-mass ratio of Fe 3+ is 0.545, the charge-to-mass ratio of Pb2+ The charge-to-mass ratio of Co is 2+ The charge-to-mass ratio of Ni is 0.0339 2+ The charge-to-mass ratio of Mn is 0.0341 2+ The charge-to-mass ratio of Cd is 0.036 2+ The charge-to-mass ratio of Pb is 0.0178 2+ The charge-to-mass ratio of Mo is 0.0096 2+ The charge-to-mass ratio of W is 0.0208 2+ The charge-to-mass ratio is 0.0109.

[0073] Generally, heavy metal ions circulate or move in a circular motion according to their characteristic radii. Considering that heavy metal ions are microscopic particles, there will be a certain distribution probability at the macroscopic motion level. For example, usually centered on the characteristic radius, the distribution probability of heavy metal ions is close to a normal distribution. Therefore, heavy metal ions are usually enriched in a certain area centered on the characteristic radius. After extracting the aqueous solution enriched with heavy metal ions, the obtained aqueous solution often contains the enriched specific heavy metal ions and possibly a small amount of other metal ions.

[0074] The same heavy metal ions gradually gather in the circular ring area corresponding to their characteristic radii; the characteristic radii of different heavy metal ions are directly related to their charge-to-mass ratios, and they gradually gather near the circular rings of different radii and move in a circular motion together. At the circular position of a specific radius, the liquid is gradually collected, thereby achieving the purpose of enrichment and separation of metal ions.

[0075] In order to completely separate different heavy metal ions in the aqueous solution, the distance between the negative electrode and the positive electrode can be increased so that the aqueous solution is distributed in a larger circular channel, making the enrichment intervals of heavy metal ions as separated as possible without repetition, which can reduce the content of other heavy metal ions in the aqueous solution collected in the collection area of the characteristic radius of a certain metal ion.

[0076] In some embodiments, for the method of separating heavy metal ions in an aqueous solution, the columnar electrode is a cylindrical conductor. The cylindrical electrode is vertically arranged as the negative electrode, and the positive electrode is a cylindrical electrode. The negative electrode is located at the axis position of the cylindrical electrode to form a uniform circular channel between the negative electrode and the positive electrode, which is beneficial to the stable circulation of the aqueous solution in the circular channel.

[0077] On the other hand, some embodiments disclose a device for separating heavy metal ions in an aqueous solution. The separation device includes:

[0078] An aqueous solution holding cylinder;

[0079] A negative electrode, arranged as a columnar electrode, is arranged in the aqueous solution holding cylinder;

[0080] A stirring assembly, which is adaptively arranged with the aqueous solution storage cylinder and is used for stirring the aqueous solution;

[0081] Among them, the inner wall of the aqueous solution storage cylinder is made of a conductive material and is set as the positive electrode.

[0082] The separation device for heavy metal ions in the aqueous solution disclosed in some embodiments further includes:

[0083] An aqueous solution extraction pipeline, which is adaptively arranged between the negative electrode and the positive electrode and is used for extracting the aqueous solution enriched with heavy metal ions.

[0084] Generally, the inlet of the aqueous solution extraction pipeline can be set at a set position in the circulation channel to extract the aqueous solution enriched with heavy metal ions at this position. In order to continuously carry out the separation process of heavy metal ions, an aqueous solution input pipeline can also be set. The input pipeline is installed at the bottom area of the aqueous solution storage cylinder, for example, it is set to communicate with the side wall of the aqueous solution storage cylinder to continuously input the aqueous solution containing heavy metal ions into it. Generally, the speed of inputting the aqueous solution can be set to be the same as the speed of extracting the aqueous solution.

[0085] In some embodiments, the setting position of the aqueous solution extraction pipeline is determined according to the characteristic radius of the heavy metal ions, and the characteristic radius is expressed as:

[0086] R = (q / m)·(E / ω 2 )

[0087] Among them, q / m is the charge-mass ratio of the heavy metal ions, ω is the movement angular velocity of the heavy metal ions, E is the electric field strength at the position where the heavy metal ions are located, R is the characteristic radius, and it is the distance between the heavy metal ions and the central axis of the negative electrode.

[0088] Generally, the inlet of the aqueous solution extraction pipeline is set according to the characteristic radius, so that the inlet is located at the enrichment of the heavy metal ions.

[0089] In the separation device for heavy metal ions in the aqueous solution disclosed in some embodiments, a concentric circle sleeve is arranged inside the aqueous solution storage cylinder, and this concentric circle sleeve serves as the positive electrode.

[0090] In the separation device for heavy metal ions in the aqueous solution disclosed in some embodiments, the stirring assembly includes:

[0091] Stirring blades, which are arranged inside the aqueous solution storage cylinder and are located between the negative electrode and the positive electrode;

[0092] A stirring motor, which is arranged outside the aqueous solution storage cylinder and is connected to the stirring blades.

[0093] In some embodiments, the separation device for heavy metal ions in the aqueous solution further includes an electrode mounting support for setting the negative electrode; and is also used for setting the positive electrode if necessary.

[0094] In some embodiments, in the separation device for heavy metal ions in an aqueous solution, the aqueous solution holding cylinder includes a cylindrical side wall and a circular bottom plate. The circular bottom plate is made of an insulating material and is connected and sealed below the cylindrical side wall to form a cylindrical aqueous solution holding cylinder with a sealed bottom.

[0095] The following further exemplarily illustrates the technical details in conjunction with the embodiments.

[0096] Embodiment 1

[0097] Figure 1 It is a schematic diagram of the composition of the separation device for heavy metal ions in an aqueous solution disclosed in Embodiment 1.

[0098] In Embodiment 1, the separation device includes a cylindrical aqueous solution holding cylinder 1, and a circular bottom plate 7 is fixedly connected to the bottom thereof to seal the bottom of the aqueous solution holding cylinder 1. The bottom plate 7 is made of an insulating material, such as glass, ceramic, plastic, etc.; a stirring motor 5 is arranged below the bottom plate 7, and a stirring blade 4 is arranged above the bottom plate 7; a plurality of stirring blades 4 are provided, and the plurality of stirring blades 4 are arranged to be connected to the same rotating shaft, and the stirring motor 5 is arranged to be connected to the rotating shaft of the stirring blade 4; the rotating shaft is located on the central axis of the aqueous solution holding cylinder 1;

[0099] In the aqueous solution holding cylinder 1, an electrode mounting support 6 is adaptively arranged, and the electrode mounting is located above the stirring blade 4; the electrode mounting support 6 is made of an insulating material and has a hollow structure, which does not affect the flow and distribution of the aqueous solution in the aqueous solution holding cylinder 1.

[0100] In the central region of the electrode mounting support 6, a negative electrode 2 is installed. The negative electrode 2 is a cylindrical conductor, and its central axis is coaxially arranged with the central axis of the aqueous solution holding cylinder; in the edge region of the electrode mounting support 6, a positive electrode 3 is installed. The positive electrode 3 is a cylindrical conductor and is sleeved on the negative electrode 2 and coaxially arranged with the negative electrode 2; an annular channel is formed between the negative electrode 2 and the positive electrode 3. After the aqueous solution 100 is put into the aqueous solution holding cylinder 1, it is distributed in the annular channel; the stirring blades 4 are evenly distributed in the annular channel.

[0101] Embodiment 2

[0102] Figure 2 It is a schematic diagram of the separation process of heavy metal ions in an aqueous solution disclosed in Embodiment 2.

[0103] In Embodiment 2, the separation device disclosed in Embodiment 1 is used to enrich and separate heavy metal ions in the aqueous solution; in Embodiment 2, the aqueous solution contains two heavy metal ions, ion A and ion B; the separation process of ion A and ion B includes:

[0104] An annular channel is formed between the negative electrode 2 and the positive electrode 3. After the aqueous solution is placed in the aqueous solution storage cylinder 1, it is distributed in the annular channel and circulates in the annular channel under the agitation of the stirring blades;

[0105] The negative electrode 2 and the positive electrode 3 are respectively connected to the negative electrode and the positive electrode of an external power source, and an electric field radially distributed from the negative electrode 2 to the positive electrode 3 is formed in the annular channel;

[0106] Under the action of the electric field, heavy metal ions in the aqueous solution circulating in the annular channel form a circular enrichment area at a specific characteristic radius; among them, the characteristic radius of ion A is R A , and the characteristic radius of ion B is R B ,

[0107] During the circulation of the aqueous solution, ion A gradually enriches with a radius of R A and is distributed in the annular region with a radius of R A . As shown in the figure, in the horizontal direction, ion A enriches in the ring with a radius of R A ; ion B gradually enriches with a radius of R B and is distributed in the annular region with a radius of R B . As shown in the figure, in the horizontal direction, ion B enriches in the ring with a radius of R B ; in the vertical direction, from bottom to top, the enrichment degree of ion A and ion B gradually increases, and the separation effect gradually improves;

[0108] The characteristic radii of ion A and ion B can be calculated according to Equation (4) in this article;

[0109] From the annular region where R A and R B are located, the aqueous solution is collected, and the aqueous solutions enriched with ion A and ion B can be obtained respectively, realizing the separation of ion A and ion B from the aqueous solution.

[0110] The separation device for heavy metal ions in the aqueous solution disclosed in the embodiments of the present invention can enrich and separate heavy metal ions from the aqueous solution. During the enrichment and separation process, the movement law of heavy metal ions in the radial electric field is utilized to enrich heavy metal ions in a specific region in the electric field, and then the aqueous solution in the specific region is collected, and the aqueous solution enriched with heavy metal ions is separated from the original aqueous solution, thereby realizing the separation of heavy metal ions. For different heavy metal ions, they can be collected in different specific regions to achieve the separation of multiple heavy metal ions; the device and method are simple, easy to operate, have low energy consumption, and can operate continuously, and have good application prospects in the fields of metal mixture separation and detection, heavy metal sewage treatment, nuclear wastewater treatment, etc.

[0111] The technical solutions disclosed in the embodiments of the present invention and the technical details disclosed in the embodiments are only exemplary illustrations of the inventive concept of the present invention, and do not constitute a limitation on the technical solutions of the embodiments of the present invention. Any conventional changes, substitutions, combinations, etc. made to the technical details disclosed in the embodiments of the present invention have the same inventive concept as the present invention and are within the protection scope of the claims of the present invention.

Claims

1. Method for separating heavy metal ions in an aqueous solution, characterized in that, the separation method includes: Setting a columnar electrode as the negative electrode, and setting a cylindrical electrode as the positive electrode around the columnar electrode; the columnar electrode is a cylindrical conductor; Forming an annular channel between the negative electrode and the positive electrode, the aqueous solution is arranged in the annular channel and circulates in the annular channel; Connecting the negative electrode and the positive electrode to an external power source respectively to form an electric field radially distributed from the negative electrode to the positive electrode in the annular channel; The heavy metal ions in the aqueous solution circulating in the annular channel flow at a specific characteristic radius under the action of the electric field; the characteristic radius is expressed as: R = (q / m)·(E / ω 2 ) where q / m is the charge-mass ratio of the heavy metal ions, ω is the movement angular velocity of the heavy metal ions, E is the electric field strength at the position where the heavy metal ions are located, R is the characteristic radius, and is the distance between the heavy metal ions and the central axis of the negative electrode; The same heavy metal ions are enriched in the circular ring-shaped area corresponding to the same characteristic radius; Collecting the aqueous solution containing the enriched heavy metal ions in the set characteristic radius area to achieve the separation of the heavy metal ions.

2. Separation device for heavy metal ions in an aqueous solution, used to perform the separation method according to claim 1, characterized in that, the separation device includes: An aqueous solution holding cylinder; wherein, the inner wall of the aqueous solution holding cylinder is made of a conductive material, and this conductive material serves as the positive electrode; A negative electrode, set as a columnar electrode, arranged in the aqueous solution holding cylinder; A stirring assembly, adaptively arranged with the aqueous solution holding cylinder for stirring the aqueous solution; An aqueous solution extraction pipeline, adaptively arranged between the negative electrode and the positive electrode for extracting the aqueous solution enriched with heavy metal ions; the setting position of the aqueous solution extraction pipeline is determined according to the characteristic radius of the heavy metal ions.

3. The separation device for heavy metal ions in an aqueous solution according to claim 2, characterized in that, The conductive material on the inner wall of the aqueous solution holding cylinder is separated from the inner wall to form an independently arranged concentric circular sleeve, and the concentric circular sleeve serves as the positive electrode.

4. The separation device for heavy metal ions in an aqueous solution according to claim 2, characterized in that, the stirring assembly includes: Stirring blades, arranged inside the aqueous solution holding cylinder, between the negative electrode and the positive electrode; A stirring motor, arranged outside the aqueous solution holding cylinder and connected to the stirring blades.

5. The separation device for heavy metal ions in an aqueous solution according to claim 2, characterized in that, It further includes an electrode mounting support for setting the negative electrode and / or the positive electrode.

6. The separation device for heavy metal ions in an aqueous solution according to claim 2, characterized in that, The bottom of the aqueous solution holding cylinder is provided with an insulating bottom plate for sealing the bottom of the aqueous solution holding cylinder.

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