Regeneration device applied to filter cloth of plate-and-frame filter press

Abstract

The utility model discloses a regeneration device applied to filter cloth of a plate-and-frame filter press. The device body comprises an airing bin and a soaking bin which are adjacently arranged, the airing bin and the soaking bin are communicated through a travelling crane, an extrusion roller is arranged in the middle of the airing bin, a plurality of filter cloth hanging frames are arranged in the middle of the soaking bin, a ceramic excess material groove is formed in the bottom of the soaking bin, a gas boiling pipe is arranged above the ceramic excess material groove and communicated with a steam pipeline, and the steam pipeline is communicated with the filter cloth hanging frames. And the medicament conveying pipe is communicated with the soaking bin. According to the utility model, the filter cloth of the plate-and-frame filter press is subjected to gas boiling cleaning, soaking, extrusion shaping and airing, so that the filter cloth can be reused, the soaking cleaning agent storage tank of the filter cloth soaking cleaning device is creatively used, a bottom inflation pipeline is additionally arranged, and countless fine bubbles are generated to float upwards and collide with the liquid level of the filter cloth soaking cleaning device to generate explosion; filter cloth solid particles leached by the hydrochloric acid soaking cleaning solution are separated, the soaking time is shortened, and the filter cloth is protected.

Description

Technical Field

[0001] This utility model belongs to the field of mineral processing technology and relates to a regeneration device for filter cloth in plate and frame filter presses. By performing gas boiling cleaning, soaking, extrusion shaping and drying on the filter cloth of the plate and frame filter press, the filter cloth can be reused, reducing production costs and improving economic efficiency. Background Technology

[0002] A plate and frame filter press is an intermittent solid-liquid separation device. It consists of filter plates and frames arranged to form filter chambers. Under the pressure of a feed pump, the liquid is fed into each filter chamber, where the solids and liquids are separated through the filter medium. This equipment is widely used in chemical, dye, petroleum, ceramic, pharmaceutical, sugar refining, starch, paint, metallurgy, and wastewater treatment industries. It has advantages such as good separation effect, wide applicability, simple operation, and low investment. It is particularly superior for separating viscous and fine materials.

[0003] Phosphate ore flotation processing plants generate thousands of tons of flotation tailings daily during normal production. These tailings contain 60%-70% water. Failure to recover this water content would inevitably lead to significant resource waste and environmental pollution. For the healthy development of these plants, phosphate tailings are typically filtered in plate and frame filter presses. The return water from the filter press is pumped into a return water storage device for use in mineral processing, such as for cleaning filter cloths. However, due to the unique characteristics of phosphate tailings, the lifespan of the filter cloths is far shorter than their designed lifespan. Currently, domestic methods for cleaning filter cloths mainly include traditional physical rinsing methods involving filter cloth disassembly, automatic cleaning methods using filter cloth cleaning devices that do not require disassembly, chemical immersion methods, and ultrasonic methods.

[0004] Traditional physical disassembly and rinsing methods are simple and inexpensive. The process involves removing the filter cloth from the filter plate, washing it with an industrial washing machine and hot water, then drying and reinstalling it. While simple and effective, removing and reinstalling the filter cloth is labor-intensive, wastes significant amounts of water and steam, and generates substantial amounts of wastewater. High-pressure water jet rinsing can remove some surface contaminants, but it cannot completely clean contaminants within the filter cloth pores, leaving the cloth unclean and prone to recontamination. Furthermore, traditional cleaning methods can lead to recontamination from human contact, airborne bacteria, and dust. Residues in the diaphragm filter press's piping system and chambers also cannot be cleaned, potentially contaminating subsequent batches and affecting product quality.

[0005] Automatic Filter Cloth Cleaning without Disassembly: This automatic filter cloth cleaning device is specifically designed to improve filter cloth cleaning efficiency. It automatically completes the cleaning process without disassembling the filter cloth. Typically integrated into a filter press system, it directly cleans the filter cloth using sprayed water or chemical cleaning agents, removing residues and dirt. This automatic cleaning device significantly reduces manual operation, improves cleaning efficiency, and reduces labor intensity. Simultaneously, it reduces equipment downtime that might occur due to filter cloth disassembly, improving production continuity. However, the initial investment cost of this device is relatively high, and it may not be effective for certain filter cloth materials. Furthermore, improper maintenance may affect the cleaning effect and the equipment's lifespan.

[0006] In summary, existing technologies for cleaning filter cloths have several drawbacks: traditional physical cleaning is ineffective but low-cost; automatic cleaning equipment gradually loses its effectiveness and is difficult to maintain; ultrasonic cleaning is the most effective but expensive, technically demanding, and difficult to maintain; and while chemical soaking is relatively inexpensive, its concentration significantly impacts the filter cloth's lifespan. Utility Model Content

[0007] To solve the above problems, this utility model provides a regeneration device for filter cloth in plate and frame filter presses.

[0008] The technical solution of this utility model is as follows:

[0009] A regeneration device for filter cloth in a plate and frame filter press is provided. The main body of the device includes an adjacent drying chamber and a soaking chamber, which are connected by a traveling trolley. A squeezing roller is provided in the middle of the drying chamber, and several filter cloth hangers are provided in the middle of the soaking chamber. A ceramic residue tank is provided at the bottom of the soaking chamber, and a boiling pipe is provided above the ceramic residue tank. The boiling pipe is connected to a steam pipeline, and a reagent delivery pipe is connected to the soaking chamber.

[0010] Preferably, the extrusion roller is driven by a roller motor.

[0011] Preferably, the trolley is placed on a trolley track.

[0012] Preferably, a guide line is provided at the bottom of the ceramic waste tank, and the lowest point of the guide line is connected to the slurry pipeline, which is connected to the slurry pump.

[0013] Preferably, a steam control valve is provided on the steam pipeline.

[0014] Preferably, the boiling tube is curved.

[0015] The method of using the regeneration device for filter cloth in a plate and frame filter press includes the following steps:

[0016] (1) After using a plate and frame filter press to filter tailings, clean the filter cloth and soak it in the soaking chamber of the above-mentioned device.

[0017] (2) After cleaning, the filter cloth is put into the drying chamber to dry.

[0018] Preferably, the soaking agent used in the soaking step of the method comprises the following components in the following mass fractions:

[0019] 4%-8% oxalic acid, 3%-6% sodium phosphate, 1%-5% sodium dodecyl sulfonate, 1%-4% sodium ethylenediaminetetraacetate, 1%-5% aminotrimethylphosphonic acid, and the remainder is water;

[0020] The concentration of the soaking agent is 30-50%;

[0021] More preferably, the soaking agent further includes the following components in the following mass fractions: 2%-15% hydrochloric acid, Pluronic F-127 4-8%.

[0022] Preferably, in step (1) of the method, the soaking temperature is 20-40℃ and the soaking time is 2-20h; the gas pressure introduced into the gas boiling tube during the soaking process is 0.3-0.8 MPA; more preferably, the soaking temperature is 40℃ and the soaking time is 4h; the gas pressure introduced into the gas boiling tube during the soaking process is 0.6 MPA.

[0023] The beneficial effects of this utility model are as follows:

[0024] 1. By performing air boiling cleaning, soaking, extrusion shaping, and drying on the filter cloth of the plate and frame filter press, the filter cloth can be reused, reducing production costs and improving economic efficiency.

[0025] 2. A method for cleaning and recycling filter cloths used in phosphate tailings filtration is provided. This method utilizes chemical immersion, determining the optimal concentration, temperature, and time of the hydrochloric acid cleaning agent. Combining this with the principle of ultrasonic cleaning, the method creatively incorporates a bottom aeration pipeline into the filter cloth immersion cleaning device's cleaning agent storage tank. This generates a cavitation effect similar to ultrasonic waves, producing numerous tiny bubbles that rise to the surface of the filter cloth immersion cleaning device and explode, separating the solid particles from the filter cloth that have been immersed in the hydrochloric acid cleaning solution. This significantly improves the efficiency of chemical immersion, shortens the immersion time, and protects the filter cloth.

[0026] 3. Using this method, undamaged discarded filter cloths generated during the flotation and beneficiation process of phosphate ore are recycled, and a complete process for filter cloth use, soaking, cleaning and recycling is established, realizing the cleaning and recycling of undamaged discarded filter cloths.

[0027] 4. Combining chemical soaking with bottom aeration, using the most reasonable concentration and soaking time of the cleaning agent, the cleaning agent soaking causes the crystalline particles of the undamaged old filter cloth to detach from the filter cloth fibers and pores. Bottom aeration forms bubbles similar to ultrasonic cavitation, which burst and detach solid particles from the filter cloth fibers and pores. This method not only has the low cost and ease of operation of chemical soaking, but also achieves the high efficiency of ultrasonic cleaning, reduces the concentration of hydrochloric acid cleaning agent, reduces the soaking time of undamaged old filter cloth, saves a lot of labor, and reduces filter cloth waste.

[0028] 5. The process of this utility model is simple, does not generate excess waste, and realizes the cleaning and recycling of filter cloth for phosphorus tailings filtration. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall assembly of this utility model.

[0030] Figure 2 This is the overall front view of the present utility model;

[0031] Figure 3 Left and right views of the main body;

[0032] Figure 4 A schematic diagram showing the installation of the ceramic waste tank 7, the curved gas boiling tube 12, and the filter cloth hanger slot;

[0033] Figure 5 This is a front view of the steel structure;

[0034] Figure 6 This is a top view of the steel structure;

[0035] Figure 7 Schematic diagram of steel structure;

[0036] In the diagram: 1. Drying chamber; 2. Soaking chamber; 3. Extrusion roller; 4. Crane track; 5. Filter cloth hanger; 6. Steam control valve; 7. Ceramic residue tank; 8. Slurry pump; 9. Crane; 10. Chemical delivery pipe; 11. Roller motor; 12. Low-pressure steam pipe; 13. Slurry pipeline; 14. Curved gas boiling pipe.

[0037] Figure 8 The light transmission effect of the filter cloth before cleaning in this utility model;

[0038] Figure 9 The light transmission effect of the filter cloth after cleaning according to this utility model;

[0039] Figure 10 Light transmission effect diagram of the new filter cloth;

[0040] Figure 11 Image showing the cleaning effect before adding hydrochloric acid;

[0041] Figure 12 Image showing the cleaning effect after adding hydrochloric acid;

[0042] Figure 13 Graph showing filter cloth perforation and reduced cleaning efficiency;

[0043] Figure 14 The cleaning effect is significantly improved, but the structural strength of the filter cloth is reduced (see figure).

[0044] Figure 15 Image showing the cleaning effect after adjusting the reagent concentration;

[0045] Figure 16 Image showing the cleaning effect after increasing the air pressure in the inflation line;

[0046] Figure 17 Image showing the cleaning effect after reducing the soaking time. Detailed Implementation

[0047] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. These embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0048] Example 1

[0049] A regeneration device for filter cloth in a plate and frame filter press is provided. The main body of the device includes a drying chamber 1 and a soaking chamber 2 arranged adjacent to each other. The drying chamber 1 and the soaking chamber 2 are connected by a traveling trolley 9. A squeezing roller 3 is provided in the middle of the drying chamber 1. Several filter cloth hangers 5 are provided in the middle of the soaking chamber 2. A ceramic residue tank 7 is provided at the bottom of the soaking chamber 2. A boiling pipe 14 is provided above the ceramic residue tank 7. The boiling pipe 14 is connected to a steam pipeline 12. A reagent delivery pipe 10 is connected to the soaking chamber 2.

[0050] Preferably, the extrusion roller 3 is driven by the roller motor 11.

[0051] Preferably, the trolley 9 is placed on the trolley track 4.

[0052] Preferably, the bottom of the ceramic waste tank 7 is provided with a guide line, the lowest point of which is connected to the slurry pipeline 13, and the slurry pipeline 13 is connected to the slurry pump 8.

[0053] Preferably, a steam control valve 6 is provided on the steam pipeline 12.

[0054] Preferably, the gas boiling tube 14 is curved.

[0055] Figure 1 As shown, ① install steel structure materials and steel plates. Figure 5 , Figure 6 , Figure 7① Assemble the steel structure foundation; ② Weld the drying chamber 1 and soaking chamber 2 together to form the main body of the device; ③ Install two 2-meter-long extrusion rollers 3 at a position 2 meters above the bottom of the middle of the drying chamber 1, driven by a roller motor 11 at one end; ④ Install multiple 2-meter-long filter cloth hangers 5 at a position 1.9 meters above the bottom of the middle of the soaking chamber 2; ⑤ Set up a trolley track 4 at a position 4 meters above the bottom of the drying chamber 1 and soaking chamber 2, and use a trolley 9 to hoist and move the filter cloth hangers 5; ⑥ Place a ceramic waste tank 7 made of glazed ceramic at the bottom of the soaking chamber 2. As shown in the figure, a drainage line is provided at the bottom, and the lowest point of the drainage line is connected to the slurry pipeline 13; ⑦ A curved gas-boiling pipe 14, made of PE material and with evenly distributed pores, is arranged horizontally 0.2 meters above the ceramic waste tank 7. One end is sealed, and the other end is connected to the low-pressure steam pipeline 12. The other end of the steam pipeline 12 is connected to the steam control valve 6; ⑧ The reagent delivery pipe 10 is connected to the soaking chamber 2 for reagent replenishment; ⑨ The ceramic waste tank 7 is connected to the slurry pipeline 13, and the other end of the slurry pipeline 13 is connected to the slurry pump 8 for slurry cleaning and extraction.

[0056] Example 2

[0057] The method of using the regeneration device for filter cloth in a plate and frame filter press includes the following steps:

[0058] (1) After using a plate and frame filter press to filter tailings, clean the filter cloth and soak it in the soaking chamber 2 of the above-mentioned device.

[0059] (2) After cleaning, the filter cloth is put into the drying chamber 1 for drying.

[0060] The soaking agent used in step (1) of the method comprises the following components by mass fraction:

[0061] 5% oxalic acid, 4% sodium phosphate, 4% sodium dodecyl sulfonate, 3% sodium ethylenediaminetetraacetate, 4% aminotrimethylphosphonic acid, and the remainder is water;

[0062] The concentration of the soaking agent is 50%;

[0063] In step (1), the soaking temperature is 24℃ and the soaking time is 24h; the gas pressure introduced into the gas boiling tube 14 during the soaking process is 0.3 MPa.

[0064] See details Figure 9-11 As can be seen from the softness and light transmission, most of the scale on the filter cloth was washed off under the action of the cleaning solution. The regular circular shaded areas in the figure are creases caused by the long-term pressure of the filter press.

[0065] Example 3

[0066] Based on Example 1, a comparison was made by changing the soaking agent.

[0067] Example 3-1: The soaking agent also includes the following components in the following mass fractions: 8% hydrochloric acid.

[0068] Example 3-2: The soaking agent further includes the following components by mass fraction: 8% hydrochloric acid, 6% Pluronic F-127 (molecular formula HO·(C2H4O)). 196 ·(C3H6O) 67 H, with a CMC value of 2.8 × 10⁻⁶. -6 (mol·dm -3 HLB value 22.0 (Caisson Labs, USA).

[0069] See Table 1 for details.

[0070] Table 1 Immersion test with added hydrochloric acid

[0071]

[0072] Before adding hydrochloric acid, the cleaning was poor; see details below. Figure 11 Twenty filter cloths were spread out as far as possible and placed in the cleaning solution containing hydrochloric acid. After soaking for 24 hours, they were removed. Upon removal, the cleaning effect was observed to have improved. The filter cloths in the upper layer of the liquid remained intact, while the lower layer near the bottom showed damage and severe hardening. The damage was as follows: Figure 12 However, adding 6% Pluronic F-127 to hydrochloric acid can reduce the breakage rate.

[0073] Example 4

[0074] Based on Example 3-2, the soaking time was adjusted in the experiment, as shown in Table 2.

[0075] Table 2

[0076]

[0077] Twenty filter cloths were spread out as much as possible and placed in a cleaning solution containing hydrochloric acid, and soaked for 18 hours before being removed. Upon removal, the cleaning effect was found to be reduced, and the hardening was alleviated. Statistics showed that 10 cloths were damaged, a damage rate of 50%. The damage details are as follows: Figure 13 .

[0078] Example 5

[0079] Based on Example 3-2, the soaking temperature was adjusted, as shown in Table 3.

[0080] Table 3

[0081]

[0082] Twenty filter cloths were spread out as much as possible and placed in a cleaning solution containing hydrochloric acid. After soaking for 18 hours, they were removed, and the soaking temperature was increased to 40℃. Upon removal, a significant improvement in cleaning effect was observed, but the structural strength of the filter cloths decreased, and damage was more severe. Statistics showed that 11 cloths were damaged, with a damage rate of 55%. The cleaning results are as follows: Figure 14 .

[0083] Example 6

[0084] Based on Example 3-2, the concentration of the soaking agent was adjusted, as shown in Table 4.

[0085] Table 4

[0086]

[0087] Twenty filter cloths were spread out as much as possible and placed in a cleaning solution containing hydrochloric acid. After soaking for 18 hours, they were removed. The soaking temperature was increased to 40℃, and the chemical concentration was reduced to 30%. Upon removal, it was found that the cleaning effect was reduced, but the structural strength of the filter cloths was preserved, and the damage rate decreased. Statistics showed that 8 cloths were damaged, with a damage rate of 40%. The cleaning results are as follows: Figure 15 .

[0088] Example 7

[0089] Based on Example 3-2, the air pressure in the inflation pipeline was adjusted, as detailed in Table 5.

[0090] Table 5

[0091]

[0092] Twenty filter cloths were spread out as much as possible and placed in a cleaning solution containing hydrochloric acid. They were soaked for 18 hours, then removed. The soaking temperature was 40℃, the reagent concentration was 30%, and the aeration pressure was increased to 0.6 MPa. Upon removal, the cleaning effect was found to be as expected, but the rate of filter cloth breakage had increased. Statistics showed that 7 cloths were broken, a breakage rate of 35%. The cleaning results are as follows: Figure 16 .

[0093] Example 8

[0094] Based on Example 3-2, the soaking time was adjusted, as shown in Table 6.

[0095] Table 6

[0096]

[0097] Twenty filter cloths were spread out as much as possible and placed in a cleaning solution containing hydrochloric acid. They were soaked for 4 hours, then removed. The soaking temperature was 40℃, the reagent concentration was 30%, and the aeration pressure was 0.6 MPa. Upon removal, the cleaning effect was found to be as expected, but the filter cloths were undamaged. The cleaning results are as follows: Figure 17 .

[0098] All standard parts used in this invention can be purchased commercially, and irregularly shaped parts can be customized according to the description and drawings. The specific connection methods for each part all employ conventional methods such as bolts, rivets, and welding, which are mature technologies in the prior art. The machinery, parts, and equipment all use conventional models in the prior art, and the circuit connections also use conventional connection methods in the prior art, which will not be detailed here. Any content not described in detail in this specification belongs to the prior art known to those skilled in the art.

[0099] The accompanying drawings of the embodiments disclosed in this invention only involve structures relevant to the embodiments of this disclosure. Other structures can refer to common designs. Unless otherwise specified, the same and different embodiments of this invention can be combined with each other. The technical solutions of this invention are explained through the above embodiments, but this invention is not limited to the above embodiments, that is, it does not mean that this invention must rely on the above specific embodiments to be implemented. Any improvements made by those skilled in the art based on this invention, or equivalent substitutions for the materials selected in this invention, fall within the scope of patent protection.

Claims

1. A regeneration device for filter cloth in a plate and frame filter press, the main body of the device comprising a drying chamber (1) and a soaking chamber (2) arranged adjacent to each other, characterized in that, The drying chamber (1) and soaking chamber (2) are connected by a crane (9). The drying chamber (1) is equipped with a squeezing roller (3) in the middle. The soaking chamber (2) is equipped with several filter cloth hangers (5) in the middle. The bottom of the soaking chamber (2) is equipped with a ceramic residue tank (7). A gas boiling pipe (14) is provided above the ceramic residue tank (7). The gas boiling pipe (14) is connected to the steam pipeline (12). The reagent delivery pipe (10) is connected to the soaking chamber (2). The bottom of the ceramic residue tank (7) is equipped with a diversion line. The lowest point of the diversion line is connected to the slurry pipeline (13).

2. The regeneration device for filter cloth in a plate and frame filter press according to claim 1, characterized in that, The extrusion roller (3) is driven by the roller motor (11).

3. The regeneration device for filter cloth in a plate and frame filter press according to claim 1, characterized in that, The trolley (9) is placed on the trolley track (4).

4. The regeneration device for filter cloth in a plate and frame filter press according to claim 1, characterized in that, The slurry pipeline (13) is connected to the slurry pump (8).

5. The regeneration device for filter cloth in a plate and frame filter press according to claim 1, characterized in that, A steam control valve (6) is installed on the steam pipeline (12).

6. The regeneration device for filter cloth in a plate and frame filter press according to claim 1, characterized in that, The gas boiling tube (14) is curved.

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