Filtering device for rhenium-containing waste acid

Abstract

The utility model discloses a filtering device for rhenium-containing waste acid, which comprises an upper cylinder and a lower cylinder, a tube plate is arranged at the joint of the upper cylinder and the lower cylinder, a plurality of mounting holes are arranged on the tube plate, each mounting hole is provided with a filtering structure, a clear liquid overflow port is arranged on the side wall of the upper part of the upper cylinder, and a filter structure is arranged on the side wall of the lower part of the upper cylinder. A first outlet and a second outlet are formed in the side wall of the upper part of the lower barrel body, a recoil valve is arranged on the first outlet, one end of a first three-way connector is arranged on the second outlet, an external pressure gauge is arranged at the second end of the first three-way connector, and a pressure release valve is arranged at the third end of the first three-way connector; according to the filtering structure, the fixing mode that the pipe plate and the cage framework are connected through the connecting pipe is adopted, the fixing mode of a screw hole and a double-end screw is replaced, the situation that the pipe plate is corroded by the corroded double-end screw and the cage framework falls off due to the fact that the screw hole is formed in the pipe plate is avoided, and the technical problem that in the prior art, a device is prone to being corroded in acid filtering is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of acid filtration and relates to a filtering device, in particular to a filtering device for rhenium-containing polluted acid. Background Art

[0002] In rhenium metal recovery systems, pretreatment of rhenium-containing waste acid and control of impurity content are key steps in ensuring the quality of ammonium rhenate products. The industry currently uses wastewater membranes to filter dilute sulfuric acid. However, because rhenium-containing waste acid contains fluoride ions, which are highly corrosive, the entire filter housing and all auxiliary filter elements will eventually corrode over time. This results in increased difficulty in subsequent production, high production investment, and uncontrollable production processes. The following shortcomings have been identified in the existing technology:

[0003] 1) The filter has a short service life.

[0004] 2) The M8 (316L) double-ended thread of the keel fixing bolt is easily corroded during use.

[0005] 3) The M8 threaded holes on the tube sheet are easily corroded.

[0006] 4) The keel gasket loses its elasticity after long-term use and is prone to deviation, causing corrosion of the tube sheet.

[0007] 5) Corrosion of filter accessories can cause the filter to be loosely sealed and cause mixing. Utility Model Content

[0008] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a filtering device for rhenium-containing contaminated acid to solve the technical problem of easy corrosion of the device in the prior art acid filtration.

[0009] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0010] A filtering device for rhenium-containing contaminated acid, comprising an upper cylinder and a lower cylinder, wherein a tube sheet is provided at the connection between the upper cylinder and the lower cylinder, a plurality of mounting holes are provided on the tube sheet, each mounting hole is provided with a filtering structure, a clear liquid overflow port is provided on the upper side wall of the upper cylinder, a first outlet and a second outlet are provided on the upper side wall of the lower cylinder, a backflush valve is provided on the first outlet, one end of a No. 1 three-way interface is provided on the second outlet, an external pressure gauge is provided on the second end of the No. 1 three-way interface, and a pressure relief valve is provided on the third end of the No. 1 three-way interface;

[0011] The filtering structure includes a connecting pipe arranged in the mounting hole, a cage frame connected thereto is provided at the lower end of the connecting pipe, and a filter membrane is provided on the outer wall of the cage frame; limiting protrusions are provided at both ends of the connecting pipe, and a limiting nut is provided between the limiting protrusion at the top of the connecting pipe and the tube sheet;

[0012] A first inlet is provided on the middle side wall of the lower cylinder, a feed valve is provided on the first inlet, a No. 2 three-way interface is provided on the feed valve, the second end of the No. 2 three-way interface is connected to a liquid inlet reflux valve, and the third end of the No. 2 three-way interface is connected to an external dirty liquid tank; a slag discharge valve is provided at the bottom of the lower cylinder.

[0013] The utility model specifically includes the following technical features:

[0014] The upper cylinder and the lower cylinder are connected via a flange.

[0015] The upper portion of the side wall of the upper cylinder is provided with a lifting lug.

[0016] An ear seat is provided on the upper portion of the side wall of the lower cylinder.

[0017] The distance between the first outlet and the tube sheet is 200 mm.

[0018] A sealing ring is provided between the flange and the tube sheet.

[0019] A pair of symmetrical inspection openings are provided on the side walls of the cone.

[0020] The bottom of the lower cylinder is conical, and the slag discharge valve is arranged at the bottom of the cone.

[0021] A pair of symmetrical inspection openings are provided on the bottom side wall of the lower cylinder.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] (I) The filtration structure of the present invention adopts a connecting pipe to connect the tube sheet and the cage frame, replacing the fixing method of wire holes and double-headed wires, avoiding the need to open wire holes in the tube sheet, causing the corroded double-headed wires to corrode the tube sheet and cause the cage frame to fall, thereby solving the technical problem of easily corroded devices in acid filtration in the prior art.

[0024] (II) In the present invention, the first inlet is located at the bottom of the lower cylinder, so that the acid solution to be treated rises statically from the bottom. This static filtration method prevents the liquid from directly impacting the filter membrane, making it easier to form a filter cake and making the filtration more stable and efficient.

[0025] (III) The utility model features an internal disassembly mode for easy cleaning and equipment maintenance. In addition, the pneumatic flexible valve is easy to open and close, safe and efficient, and has excellent corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0027] Figure 2 for Figure 1 A partial schematic diagram of the filtering structure in .

[0028] The meanings of the various numbers in the figure are: upper cylinder 1, lower cylinder 2, tube sheet 3, filtering structure 4, mounting hole 5, clear liquid overflow port 6, first outlet 7, second outlet 8, backflush valve 10, No. 1 three-way interface 9, external pressure gauge 11, pressure relief valve 12, first inlet 13, feed valve 14, No. 2 three-way interface 15, liquid inlet and return valve 16, slag discharge valve 17, flange 18, lifting ear 19, ear seat 20, sealing ring 21, inspection port 22;

[0029] Connecting tube 401, cage frame 402, filter membrane 403, limiting protrusion 404, limiting nut 405.

[0030] The specific contents of the present invention are further explained in detail below with reference to the embodiments. DETAILED DESCRIPTION

[0031] It should be noted that, unless otherwise specified, all components in the present invention are components known in the art.

[0032] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the scope of protection of the present invention.

[0033] The utility model provides a filtering device for rhenium-containing polluted acid, comprising an upper cylinder 1 and a lower cylinder 2. A tube sheet 3 is provided at the connection between the upper cylinder 1 and the lower cylinder 2. A plurality of mounting holes 5 are opened on the tube sheet 3. Each mounting hole 5 is provided with a filtering structure 4. A clear liquid overflow port 6 is provided on the upper side wall of the upper cylinder 1. A first outlet 7 and a second outlet 8 are provided on the upper side wall of the lower cylinder 2. A backflush valve 10 is provided on the first outlet 7. One end of a No. 1 three-way interface 9 is provided on the second outlet 8. An external pressure gauge 11 is provided on the second end of the No. 1 three-way interface 9. A pressure relief valve 12 is provided on the third end of the No. 1 three-way interface 9.

[0034] The filter structure 4 includes a connecting tube 401 disposed in the mounting hole 4. The lower end of the connecting tube 401 is provided with a cage frame 402 in communication therewith. A filter membrane 403 is provided on the outer wall of the cage frame 402. Both ends of the connecting tube 401 are provided with a limiting protrusion 404. A limiting nut 405 is provided between the limiting protrusion 404 at the top of the connecting tube 401 and the tube sheet 3.

[0035] A first inlet 13 is provided on the middle side wall of the lower cylinder 2, a feed valve 14 is provided on the first inlet 13, a No. 2 three-way interface 15 is provided on the feed valve 14, the second end of the No. 2 three-way interface 15 is connected to a liquid inlet reflux valve 16, and the third end of the No. 2 three-way interface 15 is connected to an external dirty liquid tank; a slag discharge valve 17 is provided at the bottom of the lower cylinder 2.

[0036] In the above technical solution, the valves are all pneumatic flexible valves, 2 DN100 type and 2 DN200 type;

[0037] Preferably, the upper cylinder 1, the lower cylinder 2 and the tube sheet 3 are all made of fluororubber.

[0038] Filter membrane Polypropylene bag filter membrane; the filter membrane and cage frame are fixed and sealed with nylon plastic buckles and rubber rings.

[0039] The system also includes a PLC control system (either an existing centralized control system or a stand-alone control system), which is electrically connected to the backflush valve 10, the external pressure gauge 11, the pressure relief valve 12, the feed valve 14, the liquid inlet reflux valve 16, and the slag discharge valve 17. According to actual production needs, the filter parameters and pressure preset values ​​of the PLC control system are set in advance, the feed valve 14 is opened, the feed reflux valve 16, the slag discharge valve 17, and the backflush valve 10 are closed, and then the external feed pump is turned on to pass the waste liquid in the external waste liquid tank through the feed valve 14. The dirty liquid is transported to the lower cylinder 2, and passes through the filter membrane 403, cage frame 402 and connecting pipe 401 in the filter structure 4 in turn, and enters the upper cylinder 1. After about 20 minutes, the clear liquid can be filtered out, and the clear liquid flows out from the clear liquid overflow port 6. Then the external pressure gauge 11 transmits the pressure data to the PLC control system, and the PLC control system determines whether the pressure exceeds the preset pressure value. If it exceeds, the PLC control system controls the pressure relief valve 12 to open, relieve part of the pressure, close the pressure relief valve 12, and the PLC control system controls the slag discharge valve 17 to open for slag discharge.

[0040] The filtration volume can be adjusted according to actual production needs by selecting a feed pump with appropriate parameters.

[0041] The upper cylinder 1 and the lower cylinder 2 are connected by a flange 18 .

[0042] In the above technical solution, the flange connection is convenient for installation and disassembly.

[0043] A lifting lug 19 is provided on the upper portion of the side wall of the upper cylinder 1 .

[0044] In the above technical solution, the lifting lug 19 is used to lift the upper cylinder 1.

[0045] An ear seat 20 is provided on the upper portion of the side wall of the lower cylinder 2 .

[0046] In the above technical solution, the ear seat 20 is used for hoisting the ear seat 20 .

[0047] The distance between the first outlet 7 and the tube sheet 3 is 200 mm.

[0048] A sealing ring 21 is provided between the flange 18 and the tube sheet 3 .

[0049] In the above technical solution, the sealing ring 21 is sealed with a silicone ring to ensure the airtightness of the cavity formed by the upper cylinder 1 and the lower cylinder 2 to prevent liquid from flowing out.

[0050] The bottom of the lower cylinder 2 is conical, and a slag discharge valve 17 is provided at the bottom of the cone.

[0051] In the above technical solution, the cone shape facilitates the deposition and discharge of waste residue.

[0052] A pair of symmetrical inspection openings 22 are provided on the bottom side wall of the lower cylinder 2 .

[0053] In the above technical solution, the inspection port 22 is used for personnel to enter and exit, install, clean and disassemble the filter structure, specifically: empty the liquid in the cylinder, rinse the filter membrane 403 with water above the tube plate 3, fix / lock the limit nuts, open the manholes 9 on both sides to enter, screw the cage frames one by one to make them detachable, remove the old filter membrane and replace it.

[0054] Implementation Cases:

[0055] From April to June 2024, the rhenium recovery production line of Jinduicheng Smelting Branch put the filtration device into the waste acid filtration pretreatment process according to production needs to filter rhenium-containing waste acid. It operated stably for 3 months. The solid content of the clear liquid of the rhenium-containing waste acid was significantly reduced after filtration. The device and filter elements were intact. After production, it was compared with the original production experience data under the same conditions. It was found that the filtration device has great advantages in production time, corrosion resistance, filtration accuracy and filtration flow, among which it has greatly improved the product quality in the later stage of rhenium metal recovery.

Claims

1. A filtering device for rhenium-containing polluted acid, comprising an upper cylinder (1) and a lower cylinder (2), wherein a tube sheet (3) is provided at the connection between the upper cylinder (1) and the lower cylinder (2), and a plurality of mounting holes (5) are provided on the tube sheet (3), characterized in that: Each of the mounting holes (5) is provided with a filtering structure (4); a clear liquid overflow port (6) is provided on the upper side wall of the upper cylinder (1); a first outlet (7) and a second outlet (8) are provided on the upper side wall of the lower cylinder (2); the first outlet (7) is provided with a backflush valve (10); the second outlet (8) is provided with one end of a No. 1 three-way interface (9); the second end of the No. 1 three-way interface (9) is provided with an external pressure gauge (11); and the third end of the No. 1 three-way interface (9) is provided with a pressure relief valve (12); The filtering structure (4) comprises a connecting tube (401) arranged in the mounting hole (5); a cage frame (402) in communication with the connecting tube (401) is provided at the lower end of the connecting tube (401); a filter membrane (403) is provided on the outer wall of the cage frame (402); limiting protrusions (404) are provided at both ends of the connecting tube (401); a limiting nut (405) is provided between the limiting protrusion (404) at the top of the connecting tube (401) and the tube plate (3); A first inlet (13) is provided on the middle side wall of the lower cylinder (2), a feed valve (14) is provided on the first inlet (13), a No. 2 three-way interface (15) is provided on the feed valve (14), a second end of the No. 2 three-way interface (15) is connected to a liquid inlet reflux valve (16), and a third end of the No. 2 three-way interface (15) is connected to an external waste liquid tank; a slag discharge valve (17) is provided at the bottom of the lower cylinder (2).

2. The filtering device for rhenium-containing contaminated acid according to claim 1, wherein: The upper cylinder (1) and the lower cylinder (2) are connected via a flange (18).

3. The filtering device for rhenium-containing contaminated acid according to claim 1 or 2, wherein: A lifting lug (19) is provided on the upper portion of the side wall of the upper cylinder (1).

4. The filtering device for rhenium-containing contaminated acid according to claim 1, wherein: An ear seat (20) is provided on the upper portion of the side wall of the lower cylinder (2).

5. The filtering device for rhenium-containing contaminated acid according to claim 1 or 2, characterized in that: The distance between the first outlet (7) and the tube sheet (3) is 200 mm.

6. The filtering device for rhenium-containing contaminated acid according to claim 2, wherein: A sealing ring (21) is provided between the flange (18) and the tube sheet (3).

7. The filtering device for rhenium-containing contaminated acid according to claim 1, wherein: The bottom of the lower cylinder (2) is in the shape of a cone, and the slag discharge valve (17) is provided at the bottom of the cone.

8. The filtering device for rhenium-containing contaminated acid according to claim 1 or 7, wherein: A pair of symmetrical inspection openings (22) are provided on the bottom side wall of the lower cylinder (2).

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