Split type self-circulation ionic membrane diaphragm frame and electrolytic bath applying same

Abstract

The invention discloses a split type self-circulation ionic membrane diaphragm frame and an electrolytic bath applying the same. The diaphragm frame comprises a main body and two inserting plates, the main body is bent into a frame shape with an opening in the front side, the three inner side faces of the main body are open, and the upper end and the lower end of the interior of the main body are each provided with two clamping grooves; at least one sash is arranged in the middle of each inserting plate, an ionic membrane is installed in each sash, the left side, the right side and the outer side of the rear side of each sash are wrapped by a U-shaped sealing strip, and the portions, wrapped by the U-shaped sealing strips, of the two inserting plates are inserted into the two clamping grooves from the front sides. According to the split type self-circulation ionic membrane diaphragm frame, through the high-density composite material and precise sealing design, the corrosion resistance, deformation resistance and sealing reliability of the diaphragm frame are remarkably improved, the split type self-circulation ionic membrane diaphragm frame is suitable for a high-concentration acid electrolyte environment, the service life of an electrolytic bath is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolytic cells, and in particular to a split-type self-circulating ion membrane diaphragm frame and an electrolytic cell using the same. Background Art

[0002] The diaphragm frames of conventional electrolyzers are often made of a single polymer material. Long-term immersion in the electrolyte can easily lead to deformation and permeation, resulting in seal failure. Existing sealing structures suffer from insufficient tolerance control, and the material's acid resistance and mechanical strength struggle to meet the demands of highly corrosive environments. Therefore, a diaphragm frame structure with high permeability resistance, excellent mechanical properties, and reliable sealing is urgently needed. Summary of the Invention

[0003] To solve the above problems, the present invention provides a split self-circulating ion membrane diaphragm frame and an electrolytic cell using the same. The diaphragm frame significantly improves the corrosion resistance, deformation resistance and sealing reliability of the diaphragm frame through high-density composite materials and precision sealing design. It is suitable for high-concentration acidic electrolyte environments, extends the service life of the electrolytic cell, and reduces maintenance costs.

[0004] According to one aspect of the present invention, a split-type self-circulating ion membrane diaphragm frame is provided, comprising a main body and two plug-in plates, wherein the main body is bent into a frame shape with an open front side, and the three inner side surfaces of the main body are all open, and the upper and lower ends of the main body are respectively provided with two card slots; at least one frame is provided in the middle of the plug-in plate, and an ion membrane is installed in the frame, and the left and right sides and the outer side of the rear side of the frame are wrapped by a U-shaped sealing strip, and the parts of the two plug-in plates wrapped by the U-shaped sealing strip are inserted into the two card slots from the front side.

[0005] In some embodiments, the top and bottom surfaces of the main body respectively have a top plate and a bottom plate that are horizontally arranged and bent in the same shape as the main body.

[0006] In some embodiments, the inner sidewall of the main body has two horizontally arranged partitions of different heights and bent in the same shape as the main body. The partitions divide the main body into the two card slots and a middle slot, and the middle slot is located between the two card slots. This is advantageous in that the partitions can separate the two card slots and the middle slot from the main body.

[0007] In some embodiments, at least one of the left and right sides of the front end of the middle groove is provided with a through opening. The advantage is that the through opening can be square, circular or other suitable shapes, which can be used to install other structures such as a deflector box as needed.

[0008] In some embodiments, two handles are provided on the outer sides of the left and right sides of the front end of the main body, respectively. The advantage of this is that the main body and even the entire diaphragm frame can be moved by the two handles.

[0009] In some embodiments, the left and right sides and rear outer sides of the plugboard are formed with integrally provided U-shaped frame strips, and the U-shaped sealing strip is wrapped around the U-shaped frame strips. This is advantageous in that the specific structure of the plugboard is further described, and the provision of the U-shaped frame strips can be used to install the U-shaped sealing strips.

[0010] In some embodiments, the front side of the inserting plate is further provided with a plurality of lifting holes, which is beneficial in that the lifting holes can be used to lift the inserting plate.

[0011] According to one aspect of the present invention, an electrolytic cell using the above-mentioned split self-circulating ion membrane diaphragm frame is provided, comprising a cell body filled with electrolytic solution, and a cathode plate, an anode plate and at least one diaphragm frame installed on the cell body. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of a split self-circulating ion membrane diaphragm frame according to one embodiment of the present invention;

[0013] Figure 2 for Figure 1 A schematic structural diagram of the main body shown;

[0014] Figure 3 for Figure 2 A schematic diagram of a portion of the structure of the main body shown;

[0015] Figure 4 for Figure 1 A schematic structural diagram of the plugboard shown;

[0016] Figure 5 for Figure 4 The schematic diagram of the structure of the plug plate when the U-shaped sealing strip is installed is shown.

[0017] In the figure: main body 1, insert plate 2, U-shaped sealing strip 3, card slot 11, top plate 12, bottom plate 13, partition 14, middle groove 15, through port 16, handle 17, frame 21, ion membrane 22, U-shaped frame strip 23, lifting hole 24. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] like Figure 1 As shown, the diaphragm frame includes a main body 1 and two inserting plates 2, wherein the two inserting plates 2 are respectively inserted into two ends (called upper and lower ends) of the main body 1.

[0020] like Figure 2-3 As shown, the main body 1 is bent into a frame shape with an open front side, and has a top plate 12 and a bottom plate 13 arranged horizontally and bent in the same shape as the main body 1 on the top and bottom surfaces respectively, and the three inner side surfaces of the main body 1 are all open.

[0021] The inner side wall of the main body 1 also has two partitions 14 of different heights, arranged horizontally and bent in the same shape as the main body 1, thereby dividing the interior of the main body 1 into three slots of different heights, among which the upper and lower slots are card slots 11, and the middle slot is set as the middle slot 15, and the two plug-in boards 2 are respectively inserted into the two card slots 11.

[0022] Preferably, a through opening 16 is provided on at least one side of the front end of the middle groove 15 (set to the left and right sides). The through opening 16 can be square, circular or other suitable shapes, and can be used to set up and install other structures such as a guide box as needed.

[0023] Preferably, two handles 17 are provided on the outer sides of the left and right sides of the front end of the whole, respectively, and the main body 1 and even the entire diaphragm frame can be moved by the two handles 17 .

[0024] In addition, the main body 1 is made of a high-density polypropylene (PP) and barium sulfate (BaSO4) composite material with a density of 1.4-1.6g / cm 3 The barium sulfate addition ratio is 30-40wt%, the barium sulfate particle size is 2-10μm, and the particle size distribution D90 / D10 ≤ 3. The high-density design improves the mechanical strength of the main body 1 (flexural modulus ≥ 30GPa), reducing the risk of deformation caused by long-term immersion in the electrolyte. The barium sulfate is evenly dispersed in the PP matrix, forming a physical barrier that reduces the diffusion rate of the electrolyte (such as sulfuric acid), significantly reducing the mass loss rate. For example, at 50°C and 30% sulfuric acid, the annual mass loss rate can reach less than 0.05% / year.

[0025] In addition, the main body 1 is formed by twin-screw extrusion and high-pressure injection molding processes, ensuring the material density and resistance to electrolyte permeation.

[0026] like Figure 4-5 As shown, two inserting plates 2 are inserted into the respective slots 11 from the front. At least one grid 21 is provided in the middle of the inserting plates 2, and an ion membrane 22 is installed in the grid 21. The shape of the grid 21 can be designed to be polygonal as needed. The figure shows a plurality of hexagonal grids 21 as an example.

[0027] On the left and right sides and rear exterior of the inserting plate 2, integral U-shaped frame strips 23 are formed. These U-shaped frame strips 23 are enclosed by a U-shaped sealing strip 3. The portions of the two inserting plates 2 enclosed by the U-shaped sealing strip 3 are inserted into the respective slots 11. The clearance between the U-shaped frame strips 23 and the slots 11 is 0.05-0.15 mm. After the inserting plate 2 is inserted, the U-shaped sealing strip 3 is compressed by 25-30%.

[0028] Preferably, the U-shaped sealing strip 3 is made of acid-resistant modified rubber with a Shore hardness of A50-70 and a compression permanent deformation rate of ≤10%. The acid resistance of the U-shaped sealing strip 3 satisfies the requirement that after being immersed in a 30% sulfuric acid solution at 60°C for 500 hours, the tensile strength retention rate is ≥85 and the volume expansion is ≤5%.

[0029] Preferably, a plurality of lifting holes 24 are further provided on the front side of the inserting plate 2 , which can be used to lift and move the inserting plate 2 .

[0030] In addition, the inserting plate 2 and the card slot 11 are both processed with high-precision molds, and the matching tolerance between the two is ≤0.1mm, which can ensure that the U-shaped sealing strip 3 pressed into the card slot 11 is evenly compressed.

[0031] The following is a test of the example diaphragm frame. The material formula of the example diaphragm frame is: PP (60wt%) + barium sulfate (38wt%) + antioxidant 1076 (2wt%), with a density of 1.52g / cm 3 The melt index (230℃, 2.16kg) is 8g / 10min. The injection molding process is as follows: barrel temperature 210-230℃, mold temperature 60℃, holding pressure 80Mpa. After molding, there are no bubbles or sink marks on the surface of the ore body.

[0032] When testing the sealing performance of the diaphragm frame, the diaphragm frame was placed under an electrolyte pressure of 0.3 MPa for 72 hours. The diaphragm frame had no leakage, and the compression amount of the U-shaped sealing strip 3 was stable at 28%.

[0033] When testing the adaptability of the plug-in plate 2 sealing structure of the diaphragm frame, after the diaphragm frame was immersed in an electrolyte at 80° C. for 30 days, the dimensional change rate was less than 0.2%, and the fitting clearance between the plug-in plate 2 and the slot 11 did not expand.

[0034] When the diaphragm frame is used to form an electrolytic cell, the electrolytic cell can be configured to have a cell body filled with a corresponding electrolytic solution (such as a sulfuric acid solution), and a cathode plate and an anode plate mounted on the cell body. At the same time, at least one diaphragm frame is installed at an appropriate position on the cell body, as appropriate, to divide the cell body into multiple different chambers (such as a cathode chamber and an anode chamber). The operation of the corresponding ions in the cell body can be reasonably controlled as needed to ensure that the electrolytic cell can achieve its desired effect.

[0035] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A split self-circulating ion membrane diaphragm frame, characterized by: The invention comprises a main body (1) and two inserting plates (2), wherein the main body (1) is bent into a frame shape with an open front side, and the three inner side surfaces of the main body (1) are all open, and the upper and lower ends of the main body (1) are respectively provided with two card slots (11); at least one frame (21) is provided in the middle of the inserting plate (2), an ion membrane (22) is installed in the frame (21), and the left and right sides and the outer side of the rear side of the frame (21) are all wrapped by a U-shaped sealing strip (3), and the parts of the two inserting plates (2) wrapped by the U-shaped sealing strip (3) are inserted into the two card slots (11) from the front side.

2. The split self-circulating ion membrane diaphragm frame according to claim 1, characterized in that: The top surface and bottom surface of the main body (1) respectively have a top plate (12) and a bottom plate (13) which are arranged horizontally and bent in the same shape as the main body (1).

3. The split self-circulating ion membrane diaphragm frame according to claim 1, characterized in that: The inner side wall of the main body (1) is provided with two partitions (14) of different heights, arranged horizontally and bent in the same shape as the main body (1); the partitions (14) divide the main body (1) into two card slots (11) and an intermediate slot (15); the intermediate slot (15) is located between the two card slots (11).

4. The split self-circulating ion membrane diaphragm frame according to claim 3, characterized in that: At least one of the left and right sides of the front end of the middle groove (15) is provided with a through opening (16).

5. The split self-circulating ion membrane diaphragm frame according to claim 1, characterized in that: Two handles (17) are respectively provided on the outer sides of the left and right sides of the front end of the main body (1).

6. The split self-circulating ion membrane diaphragm frame according to claim 1, characterized in that: The left and right sides and the outer side of the rear side of the inserting plate (2) are formed with an integrally arranged U-shaped frame strip (23), and the U-shaped sealing strip (3) is wrapped around the U-shaped frame strip (23).

7. The split self-circulating ion membrane diaphragm frame according to claim 1, characterized in that: The front side of the inserting plate (2) is also provided with a plurality of lifting holes (24).

8. An electrolytic cell using the split self-circulating ion membrane diaphragm frame according to any one of claims 1 to 7, characterized in that: The invention comprises a tank body which is filled with electrolytic solution and on which a cathode plate, an anode plate and at least one diaphragm frame are installed.

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