Modularized fluorine ion exchange column

Abstract

The utility model provides a modularized fluorine ion exchange column, which adopts a column body structure formed by connecting a plurality of sections of flanges to realize height adjustability and adapt to different fluorine concentration and flow requirements. Spiral flow guide ribs are arranged in the column to guide wastewater to spirally flow, fluid distribution is optimized through centrifugal force, and the fringe effect is reduced; the assembling precision between the columns is ensured through a concave-convex positioning mechanism, and the corrosion resistance is enhanced by matching with a polytetrafluoroethylene lining. The system integrates a water distribution plate and funnel combined structure, realizes flow equalization through groove water distribution holes, eliminates a bias flow phenomenon, and improves the resin utilization rate. And the saturation of the resin can be observed at any time through fluorine ion color-changing exchange resin and an observation window. The resin bracket is of a pull ring type quick release structure, and quick maintenance is achieved through a tap bolt and a sealing ring annular groove. According to the device, through modular combination, flow field optimization and visual monitoring, the fluorine ion deep purification efficiency and the operation convenience are remarkably improved.

Description

A modular fluoride ion exchange column Technical Field

[0001] This utility model relates to the technical field of fluoride-containing wastewater treatment devices, specifically to fluoride ion exchange columns, and more specifically to a modular fluoride ion exchange column. Background Technology

[0002] Fluoride ion exchange columns are core equipment for purifying fluoride-containing wastewater, primarily used to remove excess fluoride ions from industrial wastewater. Traditional treatment technologies include chemical precipitation, adsorption, and membrane separation, each with its own drawbacks such as low efficiency, limited adsorption capacity, and susceptibility to scaling. Currently, ion exchange technology based on functionalized resins or composite materials offers high selectivity, high adsorption capacity, and regenerability, thus gaining widespread application.

[0003] However, traditional fluoride ion exchange columns are mostly one-piece structures, which are difficult to adapt to fluoride-containing wastewater with different water quality and quantity fluctuations. The removal efficiency of fluoride ion exchange columns is related to the contact time between fluoride ions and exchange resin. Increasing the column height can prolong the residence time of wastewater in the column, thereby improving the fluoride ion exchange rate. Summary of the Invention

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A modular fluoride ion exchange column includes a column body with multiple segments connected detachably by flanges. At least one of the segments contains a filter unit. The column body includes a first column and a second column arranged from bottom to top. The top surface of the first column and the bottom surface of the second column are positioned by a convex-concave fit. The inner wall of the column body is provided with spiral guide ribs. The filter unit includes fluoride ion exchange resin. A conical water collection area is provided at the bottom of the column body.

[0007] Furthermore, the top surface of the first column is provided with a positioning ring, and the bottom surface of the second column is provided with a positioning groove adapted to the positioning ring.

[0008] Furthermore, the positioning ring is asymmetrically provided with notches, and the positioning groove is provided with protrusions that fit the notches.

[0009] Furthermore, each column section is provided with at least one filter unit, the filter unit including a resin bracket, and the resin bracket is provided with exchange resin layers on both the upper and lower sides.

[0010] Furthermore, the exchange resin layer includes a fluoride ion color-changing exchange resin, and the column is provided with an observation window.

[0011] Furthermore, the column is provided with a polytetrafluoroethylene liner.

[0012] Furthermore, a sealing ring is embedded on the outer edge of the resin bracket, and an annular groove adapted to the sealing ring is provided inside the column. A pull ring is provided through the resin bracket and penetrates the exchange resin layer. The pull ring is provided with a self-tapping screw head, and the pull ring is connected to the resin bracket by the self-tapping screw.

[0013] Furthermore, at least one of the multiple columns is detachably provided with a water distribution plate located below the resin bracket. The water distribution plate has multiple grooves evenly distributed downwards, and water distribution holes are provided at the bottom of the grooves.

[0014] Furthermore, at least two inserts are provided on the outer periphery of the bottom of the water distribution plate, and slots adapted to the inserts are provided on the inner wall of the column.

[0015] Furthermore, a funnel is provided at the edge of the water distribution plate.

[0016] The advantages and beneficial effects of this utility model are as follows:

[0017] 1. By connecting multiple columns in series, fluoride ion exchange columns of different total heights can be combined to adapt to different fluoride concentrations and flow rate requirements, ensuring deep purification of fluoride ions; the inner wall of the column is equipped with spiral guide ribs to force the wastewater to flow along the spiral trajectory, and the centrifugal force guides the fluid to the center of the column, reducing edge effects and ensuring uniform utilization of the resin bed.

[0018] 2. The column integrates a water distribution plate, avoiding the flow deviation or channeling phenomena caused by uneven height in traditional exchange columns, thus improving mass transfer uniformity. The adsorption saturation of the fluoride ion exchange resin can be visually displayed through the observation window.

[0019] 3. The funnel and the water distribution plate collect the wastewater that permeates from the ion exchange resin layer and distribute the wastewater evenly to the lower column, respectively. This reduces the imperfect exchange of wastewater at the edge of the ion exchange resin layer when multiple columns are working continuously, thus improving the exchange efficiency. Attached Figure Description

[0020] Figure 1 is a structural schematic diagram of this utility model;

[0021] Figure 2 is an enlarged structural schematic diagram of the first column of this utility model;

[0022] Figure 3 is a schematic diagram of the internal structure of the first column of this utility model;

[0023] Figure 4 is a schematic diagram of the pull ring of this utility model;

[0024] In the picture:

[0025] 101-First column, 102-Second column, 103-Conical water collection area, 201-Flange, 202-Positioning ring, 203-Positioning groove, 204-Notch, 205-Protrusion, 301-Spiral guide rib, 401-Water distribution plate, 402-Groove, 403-Water distribution hole, 404-Insertion block, 405-Slot, 406-Function funnel, 501-Resin bracket, 502-Exchange resin layer, 503-Sealing ring, 504-Ring groove, 506-Observation window, 507-Pull ring, 508-Self-tapping bolt, 601-Inner lining. Detailed Implementation

[0026] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0027] Example 1

[0028] This invention provides a modular fluoride ion exchange column, comprising multiple column sections, including a first column 101 and a second column 102, detachably connected by a flange 201. The number of columns can be flexibly increased or decreased according to wastewater treatment requirements to adjust the total height and extend the wastewater retention time. A conical water collection area 103 is provided at the bottom of the column for collecting the purified wastewater.

[0029] The top surface of the first column 101 is provided with an asymmetrical positioning ring 202, and the bottom surface of the second column 102 is provided with a matching positioning groove 203. The positioning ring 202 has a notch 204, and the corresponding position of the positioning groove 203 has a protrusion 205. This asymmetrical design ensures that the multiple column segments can only be assembled in a single direction, avoiding misalignment. During assembly, the flange 201 is fastened with bolts, and the convex-concave fit structure ensures connection accuracy and prevents leakage.

[0030] The inner wall of the column is equipped with spiral guide ribs 301. After the wastewater enters the column, it is guided by the spiral guide ribs to form a swirling flow. Centrifugal force pushes the fluid towards the center of the column, reducing edge effects and ensuring that the exchange resin is in uniform contact with the wastewater, thereby improving the exchange efficiency.

[0031] Each section of the column contains a filtration unit, including a resin bracket 501 and upper and lower exchange resin layers 502. A sealing ring 503 is embedded on the outer edge of the resin bracket 501, and a matching annular groove 504 is provided on the inner wall of the column to ensure sealing. Fluoride ion color-changing exchange resin fills the spaces between the sieve plates, and the resin color change can be monitored in real time through an observation window 506 on the column to determine saturation. The resin bracket 501 can be quickly disassembled using a pull ring 507 and self-tapping screws 508 for easy maintenance.

[0032] A detachable water distribution plate 401 is provided below the resin bracket 501. The surface of the plate has evenly distributed grooves 402, with water distribution holes 403 at the bottom of the grooves. The water distribution plate 401 is fixed to a slot 405 on the inner wall of the column via a bottom insert 404. Wastewater is evenly distributed to the lower column through the water distribution holes 403, preventing uneven flow. A funnel 406 is provided at the edge of the water distribution plate 401 to collect wastewater permeating from the screen plate, ensuring uniform fluid distribution during continuous operation.

[0033] The inner wall of the column is lined with polytetrafluoroethylene 601 to enhance corrosion resistance and adapt to high-concentration fluoride-containing wastewater environments.

[0034] Preferred technical solutions include fluoride ion color-changing exchange resins selected from (A) lanthanide metal-supported resins such as lanthanum-supported polystyrene resins, whose color change is from white to pale yellow or brown upon saturation; (B) zirconium-based composite color-changing resins such as zirconium alizarin sulfonate resin (commercially known as "fluorine reagent resin"), which utilize the high affinity of zirconium (Zr) for fluorine and combine with a color-developing agent (such as alizarin sulfonic acid). The color change state is from orange-red to fading; and (C) weakly basic anion exchange resins supported on bromocresol green.

[0035] As a preferred technical solution, the observation window can be made of glass or acrylic sheet, but more preferably of soluble polytetrafluoroethylene (a copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene). The soluble polytetrafluoroethylene is transparent and can be thermally fused to the inner lining polytetrafluoroethylene. A flange window is provided on the outer layer, which combines sealing and practicality.

[0036] Example 2

[0037] This embodiment addresses high-fluoride-concentration wastewater by extending the treatment process through increasing the number of column sections. For example, three columns can be connected in series, each filled with resin of different adsorption capacities, achieving step-by-step purification. A combination of a distribution plate and a funnel enables multi-stage flow uniformity, spiral guide ribs optimize the flow field at each stage, and an observation window provides real-time feedback on the resin status, allowing operators to promptly replace saturated resin.

[0038] When the resin is saturated, tighten the self-tapping screws 508 to the resin bracket 501 using the pull ring 507, then pull the whole thing out, replace with new resin, and reinstall. The water distribution plate 401 can also be disassembled and cleaned separately to avoid clogging. The modular design reduces maintenance time by more than 50%.

[0039] The working principle of this invention is as follows: fluoride-containing wastewater enters the first column from the top and flows spirally along the inner wall of the column under the guidance of the spiral guide ribs 301. Centrifugal force pushes the fluid towards the center of the column, reducing "short-circuiting" at the edges and forcing the wastewater to fully contact the exchange resin layer 502. The spiral trajectory prolongs the residence time of the wastewater in the column, ensuring sufficient reaction between fluoride ions and the exchange resin. The wastewater flows sequentially through multiple series-connected columns, each filled with fluoride ion-changing color-changing exchange resin. The resin adsorbs fluoride ions through ion exchange reactions, and its color changes with saturation. Operators can monitor the resin status in real time through the observation window 506. A combination structure of a water distribution plate 401 and a funnel 406 is installed between the columns. The surface of the water distribution plate 401 is evenly distributed with grooves 402 and water distribution holes 403 to uniformly disperse wastewater to the lower columns, preventing flow deviation or channeling caused by uneven flow velocity. The funnel 406 collects wastewater permeating from the upper resin bed and guides it to the lower water distribution plate 401, ensuring continuous and uniform flow between the multi-stage columns. The inner wall of the columns is covered with a fluoroplastic liner 601 to resist chemical corrosion from high concentrations of fluoride ions. Each column section is connected by flanges, and precise assembly is achieved using asymmetric positioning rings and positioning grooves. Sealing gaskets can be embedded between the flanges to prevent leakage. The sealing ring on the outer edge of the resin bracket cooperates with the column's annular groove to further ensure the system's sealing performance.

[0040] When the operator judges that the resin is close to saturation by observing the color change in the observation window, the saturated column can be removed. Then, the self-tapping screw 508 of the pull ring is connected to the resin bracket 501, and the resin bracket 501 and the fluoride ion exchange resin attached to its surface are pulled out.

[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A modular fluoride ion exchange column, comprising a column body, characterized in that: The column is provided with multiple sections, and the sections are detachably connected by flanges (201). At least one of the multiple sections of the column is provided with a filter unit inside. The column includes a first column (101) and a second column (102) arranged from bottom to top. The top surface of the first column (101) and the bottom surface of the second column (102) are positioned by a concave-convex fit. The inner wall of the column is provided with spiral guide ribs (301). The filter unit includes fluoride ion exchange resin. The bottom of the column is provided with a conical water collection area (103).

2. The modular fluoride ion exchange column according to claim 1, characterized in that: The top surface of the first column (101) is provided with a positioning ring (202), and the bottom surface of the second column (102) is provided with a positioning groove (203) adapted to the positioning ring (202).

3. The modular fluoride ion exchange column according to claim 2, characterized in that: The positioning ring (202) is asymmetrically provided with a notch (204), and the positioning groove (203) is provided with a protrusion (205) that adapts to the notch (204).

4. The modular fluoride ion exchange column of claim 1, wherein: Each column section is provided with at least one filter unit, and the filter unit includes a resin bracket (501), with exchange resin layers (502) provided on both the upper and lower sides of the resin bracket.

5. The modular fluoride ion exchange column according to claim 4, characterized in that: The exchange resin layer (502) includes a fluoride ion color-changing exchange resin, and the column is provided with an observation window (506).

6. The modular fluoride ion exchange column of claim 1, wherein: The column is provided with a polytetrafluoroethylene liner (601).

7. The modular fluoride ion exchange column of claim 4, wherein: The resin bracket (501) is provided with a sealing ring (503) embedded on its outer edge. The inside of the column is provided with an annular groove (504) that is adapted to the sealing ring (503). The resin bracket (501) is provided with a pull ring (507) that penetrates the exchange resin layer (502). The pull ring (507) is provided with a self-tapping screw (508). The pull ring (507) is connected to the resin bracket (501) through the self-tapping screw (508).

8. The modular fluoride ion exchange column according to claim 4, characterized in that: Inside at least one of the plurality of columns, a water distribution plate (401) is detachably installed below a resin bracket (501) located inside the column. The water distribution plate has a plurality of grooves (402) evenly distributed downwards, and water distribution holes (403) are provided at the bottom of the grooves (402).

9. The modular fluoride ion exchange column according to claim 8, characterized in that: At least two inserts (404) are provided on the outer periphery of the bottom of the water distribution plate (401), and a slot (405) adapted to the inserts (404) is provided on the inner wall of the column.

10. The modular fluoride ion exchange column of claim 8, wherein: A funnel (406) is provided at the edge of the water distribution plate (401).

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