Phosphorus salt filter cloth regeneration system

Abstract

The utility model discloses a phosphorus salt filter cloth regeneration system which comprises a hot water tank and an acid circulation tank which are communicated with a liquid inlet of a flushing pipeline of a filter press loaded with phosphorus salt filter cloth through connecting pipes, and an acid-base neutralization pool communicated with a liquid outlet of the flushing pipeline of the filter press through a connecting pipe, a connecting pipe between the acid circulating tank and the filter press is provided with a communicating pipeline in an extending manner, the acid circulating tank is connected with the bag filter through the communicating pipeline, and the communicating pipeline is provided with a first valve. The phosphorus salt filter cloth regeneration system disclosed by the utility model not only solves the problem that the filter cloth can be cleaned without being disassembled, but also depends on the integration of the bag type filter and the acid-base neutralization tank, so that not only is the damage of corrosion of equipment by a pickling solution effectively avoided, but also the pickling solution and a water washing solution can be recycled for retreatment and application, and the service life of the equipment is prolonged. And the cleaning cost is effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of regeneration, and in particular relates to a phosphate filter cloth regeneration system. Background Art

[0002] At present, the production process of battery-grade iron phosphate on the market mainly uses monoammonium phosphate, diammonium phosphate, etc. as phosphorus sources, and iron powder, ferrous sulfate, etc. as iron sources. Because the phosphate salts on the market do not meet the use requirements, they need to be further dissolved and purified. In the process of industrial-grade phosphate purification, due to the relatively small amount of impurities, filter cakes cannot be formed, and the filter cloth of the plate and frame filter press has a high mesh count, which makes the filter cloth easily clogged, resulting in a decrease in filtration volume, which cannot meet the production capacity requirements and requires frequent replacement of the filter cloth. It takes seven or eight hours for the filter press to replace the filter cloth once, which not only increases the loss cost of the filter cloth, but also seriously affects the production capacity.

[0003] The current filter cloth regeneration method is to dismantle the filter cloth and soak it for regeneration, which affects production capacity; or to clean it online, and the pickling liquid enters the production line, which not only corrodes the equipment, consumes a large amount of reagents, but also affects the quality of battery-grade iron phosphate.

[0004] Based on this, there is an urgent need for a regeneration device for phosphate filter cloth, which not only solves the problem of soaking and cleaning without disassembly, but also can effectively avoid subsequent equipment corrosion, and realizes the recycling of cleaning liquid, reducing production costs. Utility Model Content

[0005] Purpose of the utility model: The technical problem to be solved by the utility model is to provide a phosphate filter cloth regeneration system, which not only does not require disassembly and cleaning, but also avoids corrosion to the equipment and can reuse the cleaning liquid.

[0006] Technical solution: The utility model discloses a phosphate filter cloth regeneration system, which comprises a hot water tank and an acid circulation tank, both of which are connected to the liquid inlet of the flushing pipe of a filter press loaded with phosphate filter cloth through a connecting pipe, and an acid-base neutralization tank, which is connected to the liquid outlet of the flushing pipe of the filter press through a connecting pipe; a connecting pipe is extended from the connecting pipe between the acid circulation tank and the filter press, which is connected to the bag filter through the connecting pipe, and a first valve is provided on the connecting pipe.

[0007] Furthermore, the regeneration system also includes an ultrafiltration device and a reverse osmosis device which are sequentially connected to the liquid outlet of the acid-base neutralization tank, wherein the clean water outlet of the ultrafiltration device is connected to the liquid inlet of the reverse osmosis device, and the clean water outlet of the reverse osmosis device is connected to the hot water tank. Preferably, the concentrated liquid outlet of the reverse osmosis device is connected to the liquid inlet of the acid-base neutralization tank.

[0008] Furthermore, the regeneration system also includes an MVR device connected to the concentrated liquid outlet of the ultrafiltration device.

[0009] Preferably, a pickling liquid return connecting pipe is further provided at the liquid outlet of the flushing pipeline of the filter press of the regeneration system, and the pickling liquid return connecting pipe is connected to the liquid inlet of the acid circulation tank.

[0010] Preferably, a hot water tank pump and a second valve are provided on the connecting pipe connecting the hot water tank and the filter press of the regeneration system.

[0011] Preferably, an acid circulation pump and a third valve are provided on the connecting pipe connecting the acid circulation tank of the regeneration system and the filter press, and the connecting pipe is located between the acid circulation pump and the third valve.

[0012] Preferably, a fourth valve is provided on the connecting pipe connecting the acid-base neutralization tank of the regeneration system and the liquid outlet of the flushing pipeline of the filter press.

[0013] Preferably, a fifth valve is provided on the acid wash return liquid connecting pipe connecting the liquid outlet of the flushing pipeline of the filter press of the regeneration system and the acid circulation tank.

[0014] Beneficial effects: Compared with the prior art, the advantages of the utility model are: the phosphate filter cloth regeneration system not only solves the problem of cleaning without disassembling the filter cloth, but also relies on the integration of bag filters, acid-base neutralization tanks, ultrafiltration devices and reverse osmosis devices, which not only effectively avoids the harm of pickling liquid corroding equipment, but also can recycle the pickling liquid and water washing liquid for reuse, effectively reducing the cleaning cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of a regeneration system according to Embodiment 1 of the present utility model;

[0016] Figure 2 This is a schematic diagram of a regeneration system according to Embodiment 2 of the present utility model;

[0017] Figure 3 This is a schematic diagram of the regeneration system of Example 3 of the utility model. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings. It should be noted that the components and equipment used in the system, such as bag filters, acid circulation tanks, acid-base neutralization tanks, ultrafiltration devices, reverse osmosis devices, etc., are all conventional equipment in the field, and no targeted improvements have been made, and they can be directly purchased from the market. The filter press loaded with phosphate filter cloth in the utility model is a plate-frame filter press.

[0019] Example 1

[0020] like Figure 1As shown, the phosphate filter cloth regeneration system of this embodiment 1 includes a hot water tank 2 for providing hot water flushing to the plate-frame filter press 1 loaded with the phosphate filter cloth, an acid circulation tank 3 for providing acid washing to the filter cloth in the plate-frame filter press 1, and an acid-base neutralization tank 4 for further neutralizing the waste water after hot water flushing. The hot water tank 2 is connected to the flushing pipeline inlet of the plate-frame filter press 1 through a connecting pipe, and a hot water tank pump 10 and a second valve 11 are provided on the connecting pipe. The acid circulation tank 3 is also connected to the liquid inlet of the flushing pipe of the plate and frame filter press 1 through a connecting pipe. The connecting pipe is also provided with an acid circulation pump 12 and a third valve 13. A connecting pipe is extended on the connecting pipe between the acid circulation pump 12 and the third valve 13. The connecting pipe is connected to the bag filter 5. The connecting pipe is provided with a first valve 6. That is, through the arrangement of the connecting pipe and the bag filter 5, when it is necessary to remove impurities from the acid solution in the acid circulation tank 3, the third valve 13 can be closed first, and the acid circulation pump 12 and the first valve 6 can be started to filter and remove impurities from the acid solution in the acid circulation tank 3.

[0021] The outlet of the flushing pipe of the plate-frame filter press 1 is connected to the acid-base neutralization tank 4 through a connecting pipe, and the outlet of the flushing pipe of the plate-frame filter press 1 is also connected to the acid circulation tank 3 through a connecting pipe. A fourth valve 14 is provided on the connecting pipe between the plate-frame filter press 1 and the acid-base neutralization tank 4, and a fifth valve 15 is provided on the connecting pipe between the outlet of the flushing pipe of the plate-frame filter press 1 and the acid circulation tank 3. When the filter cloth is flushed with hot water in the hot water tank 2, the second valve 11 and the fourth valve 14 are opened accordingly, and the other valves are closed. When the acid circulation tank 3 is used for acid cleaning, the third valve 13 and the fifth valve 15 are opened accordingly, realizing multi-level deep cleaning and recycling.

[0022] Example 2

[0023] Based on the acid-base neutralization tank of the regeneration system of Example 1, a water treatment system can be integrated to reprocess the wastewater and recycle it for reuse to reduce production costs. Specifically, the regeneration system may also include an ultrafiltration device 7 and a reverse osmosis device 8 that are sequentially connected to the acid-base neutralization tank 4. That is, the liquid outlet of the acid-base neutralization tank 4 is connected to the liquid inlet of the ultrafiltration device 7 through a connecting pipe, and the clean water outlet of the ultrafiltration device 7 is connected to the liquid inlet of the reverse osmosis device 8 through a connecting pipe, and the clean liquid outlet of the reverse osmosis device 8 is circulated to the hot water tank 2 through a connecting pipe to regenerate and reuse the wastewater. The concentrated liquid outlet of the reverse osmosis device 8 is circulated to the acid-base neutralization tank 4 through a connecting pipe for circulation treatment, such as Figure 2 shown.

[0024] Example 3

[0025] In addition, based on the additional water treatment regeneration system in Example 2, the concentrated liquid in the ultrafiltration device 7 can be further recycled. That is, the MVR evaporation and crystallization system 9 is integrated on the ultrafiltration device 7 to further evaporate and crystallize the concentrated water obtained in the ultrafiltration device 7 to obtain corresponding salts, such as Figure 3 shown.

[0026] In summary, based on the above embodiments, the regeneration system of the utility model not only does not need to be disassembled for cleaning, but also avoids corrosion to the equipment and can reuse the cleaning liquid. In addition, the corresponding pump device can be added to each connecting pipe of the utility model according to actual needs to realize the operation cycle function.

Claims

1. A phosphate filter cloth regeneration system, characterized in that: The regeneration system comprises a hot water tank (2) and an acid circulation tank (3) both connected to a liquid inlet of a flushing pipe of a filter press (1) loaded with a phosphate filter cloth through a connecting pipe, and an acid-base neutralization tank (4) connected to a liquid outlet of the flushing pipe of the filter press (1) through a connecting pipe; a connecting pipe is extended from the connecting pipe between the acid circulation tank (3) and the filter press (1), and is connected to a bag filter (5) through the connecting pipe, and a first valve (6) is provided on the connecting pipe.

2. The phosphate filter cloth regeneration system according to claim 1, characterized in that: The regeneration system further comprises an ultrafiltration device (7) and a reverse osmosis device (8) which are sequentially connected to the liquid outlet of the acid-base neutralization tank (4); the clean water outlet of the ultrafiltration device (7) is connected to the liquid inlet of the reverse osmosis device (8); and the clean water outlet of the reverse osmosis device (8) is connected to the hot water tank (2).

3. The phosphate filter cloth regeneration system according to claim 2, characterized in that: The concentrated liquid outlet of the reverse osmosis device (8) is connected to the liquid inlet of the acid-base neutralization tank (4).

4. The phosphate filter cloth regeneration system according to claim 2, characterized in that: The regeneration system also includes an MVR evaporation crystallization system (9) connected to the concentrated liquid outlet of the ultrafiltration device (7).

5. The phosphate filter cloth regeneration system according to any one of claims 1, 3 or 4, characterized in that: A pickling liquid return connection pipe is also provided at the liquid outlet of the flushing pipeline of the filter press (1), and the pickling liquid return connection pipe is connected to the liquid inlet of the acid circulation tank (3).

6. The phosphate filter cloth regeneration system according to claim 1, 3 or 4, characterized in that: A hot water tank pump (10) and a second valve (11) are provided on the connecting pipe connecting the hot water tank (2) and the filter press (1).

7. The phosphate filter cloth regeneration system according to claim 1, 3 or 4, characterized in that: An acid circulation pump (12) and a third valve (13) are provided on a connecting pipe connecting the acid circulation tank (3) and the filter press (1), and the connecting pipe is located between the acid circulation pump (12) and the third valve (13).

8. The phosphate filter cloth regeneration system according to claim 1, 3 or 4, characterized in that: A fourth valve (14) is provided on a connecting pipe connecting the acid-base neutralization tank (4) and the liquid outlet of the flushing pipeline of the filter press (1).

9. The phosphate filter cloth regeneration system according to claim 5, characterized in that: A fifth valve (15) is provided on the acid wash return liquid connecting pipe connecting the liquid outlet of the flushing pipe of the filter press (1) and the acid circulation tank (3).

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