Online cleaning system for filter cloth of filter press

Abstract

The utility model discloses an on-line cleaning system for filter cloth of a filter press. The on-line cleaning system comprises a filter cake washing assembly, a filter cake blow-drying assembly, a slurry back-blowing backflow assembly, the filter press, a pneumatic diaphragm pump, a fifth valve, a regenerated acid storage tank and a waste acid collection tank, the filter press is connected with a pneumatic diaphragm pump through a pipeline, the pneumatic diaphragm pump is connected with a feeding pipe, and the pneumatic diaphragm pump is also connected with a regenerated acid storage tank through a pipeline; the filter press is connected with a waste acid purification tank through an outlet filtrate pipeline, and the waste acid collection tank is connected with the outlet filtrate pipeline through a pipeline. According to the on-line cleaning device, the filter cloth of the filter press is regularly cleaned on line, so that the working efficiency of the filter press is ensured; the labor intensity of workers for frequently replacing the filter cloth is reduced; the service life of the filter cloth is prolonged by 2-3 times, the consumption of the filter cloth is greatly reduced, and the cost is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of acid regeneration and desilication, specifically an online cleaning system for filter cloth in a filter press. Background Technology

[0002] The supernatant from the acid regeneration desilication process overflows into the purified waste acid tank, and the sludge at the bottom is pumped to the filter press by a mud pump. The filter press filtrate is returned to the settling tank (or enters the purified waste acid tank). The generated mud cake is first collected in the filter cake bin and then discharged by vehicle.

[0003] Existing cleaning systems such as Figure 2 As shown, the pump pumps the sludge from the bottom of the sedimentation tank into the filter press. The filter cake is collected and discharged from the filter cloth compartment at the bottom of the filter press (not shown in this figure). The filtrate is discharged to the purified waste acid tank through the valve. Other auxiliary functions include filter cake washing (consisting of a washing water tank, washing pump, and pipeline valves), filter cake drying (consisting of compressed air and pipeline valves), and sludge backflushing (consisting of compressed air and pipeline valves).

[0004] Existing technologies have the following problems: After a certain period of use, silica sludge adheres to the surface and interior of the filter cloth in a filter press. This makes filter cake removal difficult and reduces the air permeability of the filter cloth, leading to decreased filter press efficiency, longer work cycles, and disruption to production. At this point, the filter cloth needs to be replaced. Due to varying filter press operating frequencies, the replacement cycle typically ranges from 1 to 4 months. Sometimes, to save costs, each replaced filter cloth is individually cleaned and reused, which is labor-intensive and ineffective. Since filter presses typically have dozens or more filter cloths online, replacement is very labor-intensive, and the cost of a single replacement can range from several thousand to tens of thousands of yuan. Therefore, we propose an online filter cloth cleaning system for filter presses. Utility Model Content

[0005] The purpose of this invention is to provide an online cleaning system for filter cloth in a filter press to solve the problems in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an online filter cloth cleaning system for a filter press, comprising a filter cake washing assembly, a filter cake drying assembly, a slurry backflushing and recirculation assembly, a filter press, a pneumatic diaphragm pump, a fifth valve, a regenerated acid storage tank, and a waste acid collection tank; the filter press is connected to the pneumatic diaphragm pump via a pipeline, the pneumatic diaphragm pump is connected to a feed pipe, and the pneumatic diaphragm pump is also connected to the regenerated acid storage tank via a pipeline; the filter press is connected to a purified waste acid tank via an outlet filtrate pipeline, and the waste acid collection tank is connected to the outlet filtrate pipeline via a pipeline.

[0007] Preferably, the feed pipe of the pneumatic diaphragm pump is equipped with a first valve; and the pipeline of the regenerated acid storage tank is equipped with an eighth valve.

[0008] Preferably, a second valve and a pressure gauge are sequentially installed on the pipeline between the pneumatic diaphragm pump and the filter press, and a backflush return pipe is also connected to the pipeline between the second valve and the pressure gauge, with a third valve installed on the backflush return pipe.

[0009] Preferably, a ninth valve is installed on the pipeline between the waste acid collection tank and the outlet filtrate pipeline; a seventh valve is installed on the outlet filtrate pipeline of the filter press.

[0010] Preferably, the filter cake washing assembly includes a washing water tank, a washing pump, and pipeline valves.

[0011] Preferably, the filter cake drying assembly includes a fourth valve, compressed air, and pipeline valves; the slurry backflushing and recirculation assembly includes a sixth valve, compressed air, and pipeline valves.

[0012] Compared with the prior art, the beneficial effects of this utility model are: by regularly cleaning the filter cloth of the filter press online, the working efficiency of the filter press is guaranteed; the labor intensity of employees frequently changing the filter cloth is reduced; the service life of the filter cloth is extended by 2-3 times compared with the past, the consumption of filter cloth is greatly reduced, and the cost is significantly reduced. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the existing technology.

[0016] In the diagram: 1. Filter press; 2. First valve; 3. Pneumatic diaphragm pump; 4. Second valve; 5. Third valve; 6. Pressure gauge; 7. Washing water tank; 8. Washing pump; 9. Fourth valve; 10. Fifth valve; 11. Sixth valve; 12. Seventh valve; 13. Regenerated acid storage tank; 14. Eighth valve; 15. Ninth valve; 16. Waste acid collection tank. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model.

[0018] Please see Figure 1 In this embodiment of the utility model, an online cleaning system for filter cloth of a filter press includes a filter cake washing component, a filter cake drying component, a slurry backflushing and reflux component, a filter press 1, a pneumatic diaphragm pump 3, a fifth valve 10, a regenerated acid storage tank 13, and a waste acid collection tank 16.

[0019] The filter press 1 is connected to a pneumatic diaphragm pump 3 via a pipeline. The pneumatic diaphragm pump 3 is connected to a feed pipe. A second valve 4 and a pressure gauge 6 are installed sequentially on the pipeline between the pneumatic diaphragm pump 3 and the filter press 1. The pipeline between the second valve 4 and the pressure gauge 6 is also connected to a backflush return pipe, which is equipped with a third valve 5. The pneumatic diaphragm pump 3 is also connected to a regenerated acid storage tank 13 via a pipeline. A first valve 2 is installed on the feed pipe of the pneumatic diaphragm pump 3. An eighth valve 14 is installed on the pipeline of the regenerated acid storage tank 13. The inlet of the pneumatic diaphragm pump 3 is connected to a regenerated acid storage tank 13. The regenerated acid comes from acid regeneration and has a hydrochloric acid concentration of 18%. The size of the storage tank depends on the size of the filter chamber of the filter press, and is generally 2-3 times the volume of the filter chamber. The filter press outlet filtrate pipeline is connected to a waste acid collection tank 16 (the volume of which is 1.5 times that of the regenerated acid storage tank). When the waste acid collection reaches a certain amount, the drain valve 16 is opened to discharge the waste acid to the waste acid tank of acid regeneration. After the filter press has been working for a period of time, its efficiency will decrease due to silica sludge blockage. If a significant decrease is observed (e.g., a normal working cycle of 3 hours now extends to 4 hours, indicating severe filter cloth blockage), the valves should be switched (the first valve 2 at the inlet of the pneumatic diaphragm pump 3 is closed, the eighth valve 14 is opened, the seventh valve 12 at the filter press outlet is closed, and the ninth valve 15 is closed, effectively cutting off the filter press outlet). Regenerated acid should then be pumped into the filter press via the slurry pump 3. When the pressure gauge 6 in the pipeline rises to 2 bar, the acid supply should be stopped, and the pressure maintained for 2-3 hours. During this time, the silica sludge (mainly Fe(OH)3) adhering to the surface and interior of the filter press cloth will react with hydrochloric acid as follows: Fe(OH)3 + HCl = FeCl3 + H2O, thus dissolving the silica sludge. Then, the ninth valve 15 in the filter press outlet pipeline should be opened to discharge the waste acid liquid inside the filter press into the waste acid collection tank 16. Open the flushing water valve to the filter press, start the flushing pump, and flush the filter cloth for 2 minutes. Discharge the flushing liquid into the waste acid collection tank 16. After completing the above steps, restore the filter press to normal operation and check whether the filter press efficiency has improved by feeding material. If not, repeat the above steps.

[0020] The filter press 1 is connected to a purified waste acid tank via an outlet filtrate pipe, and the waste acid collection tank 16 is connected to the outlet filtrate pipe via a pipe; a ninth valve 15 is installed on the pipe between the waste acid collection tank 16 and the outlet filtrate pipe; a seventh valve 12 is installed on the outlet filtrate pipe of the filter press 1.

[0021] The filter cake washing assembly includes a washing water tank 7, a washing pump 8, and pipeline valves; the filter cake drying assembly includes a fourth valve 9, compressed air, and pipeline valves; the slurry backflushing assembly includes a sixth valve 11, compressed air, and pipeline valves.

[0022] The working principle of this utility model is as follows: the inlet of the pneumatic diaphragm pump 3 is connected to a regenerated acid storage tank 13. The regenerated acid comes from acid regeneration and has a hydrochloric acid concentration of 18%. The size of the storage tank is determined according to the size of the filter chamber of the filter press, which is generally 2-3 times the volume of the filter chamber. The filter press outlet filtrate pipeline is connected to a waste acid collection tank 16 (the volume of which is 1.5 times that of the regenerated acid storage tank). When the waste acid collection reaches a certain amount, the drain valve 16 is opened to discharge the waste acid to the waste acid tank of acid regeneration. After the filter press has been working for a period of time, its efficiency will decrease due to silica sludge blockage. If a significant decrease is observed (e.g., a normal working cycle of 3 hours now extends to 4 hours, indicating severe filter cloth blockage), the valves should be switched (the first valve 2 at the inlet of the pneumatic diaphragm pump 3 is closed, the eighth valve 14 is opened, the seventh valve 12 at the filter press outlet is closed, and the ninth valve 15 is closed, effectively cutting off the filter press outlet). Regenerated acid should then be pumped into the filter press via the slurry pump 3. When the pressure gauge 6 in the pipeline rises to 2 bar, the acid supply should be stopped, and the pressure maintained for 2-3 hours. During this time, the silica sludge (mainly Fe(OH)3) adhering to the surface and interior of the filter press cloth will react with hydrochloric acid as follows: Fe(OH)3 + HCl = FeCl3 + H2O, thus dissolving the silica sludge. Then, the ninth valve 15 in the filter press outlet pipeline should be opened to discharge the waste acid liquid inside the filter press into the waste acid collection tank 16. Open the flushing water valve to the filter press, start the flushing pump, and flush the filter cloth for 2 minutes. Discharge the flushing liquid into the waste acid collection tank 16. After completing the above steps, restore the filter press to normal operation. Feed material to check if the filter press efficiency has improved. If not, repeat the above steps. In practice, one cleaning typically allows for 15 days of normal use. Therefore, a 15-day online cleaning cycle can be set, or a reasonable cleaning cycle can be determined based on actual conditions. This solution reduces the workload of frequent filter cloth replacements and significantly extends the filter cloth's lifespan, thus lowering costs.

[0023] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An online cleaning system for filter cloth in a filter press, characterized in that: It includes a filter cake washing assembly, a filter cake drying assembly, a slurry backflushing and recirculation assembly, a filter press (1), a pneumatic diaphragm pump (3), a fifth valve (10), a regenerated acid storage tank (13), and a waste acid collection tank (16). The filter press (1) is connected to a pneumatic diaphragm pump (3) via a pipeline. The pneumatic diaphragm pump (3) is connected to a feed pipe. The pneumatic diaphragm pump (3) is also connected to a regenerated acid storage tank (13) via a pipeline. The filter press (1) is connected to a purified waste acid tank via an outlet filtrate pipe, and the waste acid collection tank (16) is connected to the outlet filtrate pipe via a pipe.

2. The filter cloth online cleaning system for a filter press according to claim 1, characterized in that: The feed pipe of the pneumatic diaphragm pump (3) is equipped with a first valve (2); the pipeline of the regenerated acid storage tank (13) is equipped with an eighth valve (14).

3. The filter cloth online cleaning system for a filter press according to claim 1, characterized in that: A second valve (4) and a pressure gauge (6) are installed sequentially on the pipeline between the pneumatic diaphragm pump (3) and the filter press (1). The pipeline between the second valve (4) and the pressure gauge (6) is also connected to a backflush return pipe, which is equipped with a third valve (5).

4. The filter cloth online cleaning system for a filter press according to claim 1, characterized in that: A ninth valve (15) is installed on the pipeline between the waste acid collection tank (16) and the outlet filtrate pipeline; a seventh valve (12) is installed on the outlet filtrate pipeline of the filter press (1).

5. The filter cloth online cleaning system for a filter press according to claim 1, characterized in that: The filter cake washing assembly includes a washing water tank (7), a washing pump (8), and pipeline valves.

6. The filter cloth online cleaning system for a filter press according to claim 1, characterized in that: The filter cake drying assembly includes a fourth valve (9), compressed air and pipeline valves; the slurry backflushing assembly includes a sixth valve (11), compressed air and pipeline valves.

Images