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

Abstract

The invention discloses a regeneration device applied to filter cloth of a plate-and-frame filter press and a use method of the regeneration device. 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, and a gas boiling pipe is arranged above the ceramic excess material groove. 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, and a soaking agent comprises the following components in percentage by mass: 4%-8% of oxalic acid, 3%-6% of sodium phosphate, 1%-5% of sodium dodecyl sulfate, 1%-4% of sodium ethylene diamine tetracetate, 1%-5% of amino trimethyl phosphoric acid and the balance of water. The soaking cleaning agent storage tank is additionally provided with a bottom inflation pipeline, generated bubbles float upwards and collide with the liquid level of the filter cloth soaking cleaning device to explode, and the filter cloth is protected.

Description

Technical Field

[0001] The present invention belongs to the technical field of mining and dressing, and relates to a regeneration device and a use method for filter cloth of a plate and frame filter press. The filter cloth of the plate and frame filter press is subjected to gas-boiling cleaning, soaking, extrusion shaping, and drying so that the filter cloth can be reused, thereby reducing production costs and improving economic efficiency. Background Art

[0002] Plate and frame filter press is an intermittent solid-liquid separation equipment, which is composed of filter plates and filter frames arranged to form filter chambers. Under the pressure of the feed pump, the feed liquid is sent into each filter chamber, and the solid and liquid are separated by the filter medium. This equipment is widely used in chemical industry, dye, petroleum, ceramics, pharmaceuticals, sugar, starch, paint, metallurgy and sewage treatment, etc. It has the advantages of good separation effect, wide application range, simple operation and low investment, especially for the separation of sticky and fine materials, it has incomparable advantages.

[0003] Phosphate flotation and mineral processing enterprises produce thousands of tons of flotation tailings every day in the normal production process. The water content of these tailings is between 60% and 70%. If these water are not recycled, it will inevitably cause great waste of resources and environmental pollution. For the healthy development of enterprises, phosphate tailings are usually filtered in a plate and frame filter press. The return water from the filter press is pumped into the return water storage device through a circulating pump and used as water for mineral processing production, such as filter cloth cleaning. However, due to the particularity of phosphate tailings, the service life of the filter cloth is much lower than its design life. At present, the domestic methods for cleaning filter cloths mainly include the traditional physical flushing method of filter cloth disassembly, the automatic cleaning method of filter cloth non-disassembly cleaning device, the chemical immersion method, the ultrasonic method, etc.

[0004] The traditional physical disassembly and flushing method is simple to operate and low-cost. Its operation includes removing the filter cloth from the filter plate, washing it with an industrial washing machine and hot water, and then drying it and reinstalling it on the filter plate. This is a simple and effective way, but removing and reinstalling the filter cloth requires labor, and it wastes a lot of water and steam, and produces a lot of sewage. Although flushing the filter cloth with a high-pressure water gun can remove some surface contaminants, it cannot completely clean the contaminants in the filter cloth pores. After cleaning, the filter cloth is still not clean and is prone to re-contamination. In addition, traditional cleaning methods can lead to re-contamination, including manual contact, bacteria and dust in the air, etc. The pipe system and residues in the chamber of the diaphragm filter press cannot be cleaned, which may cause contamination of the next batch of production, thereby affecting product quality.

[0005] Automatic cleaning method with non-disassembly cleaning device for filter cloth: The automatic cleaning device for filter cloth is a device designed to improve the cleaning efficiency of filter cloth. It can automatically complete the cleaning process without removing the filter cloth. The device is usually integrated into the filter press system, and directly cleans the filter cloth by spraying water or chemical cleaning agents to remove residues and dirt on the filter cloth. The automatic cleaning device without disassembly greatly reduces manual operation, improves cleaning efficiency, and reduces labor intensity. At the same time, it can also reduce the equipment downtime that may be caused by removing the filter cloth and improve production continuity. The initial investment cost of this device is high, and the cleaning effect may not be good for filter cloths made of certain special materials. In addition, improper maintenance may affect the cleaning effect and equipment life.

[0006] Ultrasonic method: Ultrasonic cleaning of filter cloth is a technology that uses the cavitation effect produced by ultrasonic high-frequency vibration in liquid to clean the filter cloth. This technology immerses the filter cloth in the cleaning liquid. The high-frequency vibration generated by the ultrasonic generator forms countless tiny bubbles in the liquid. These bubbles grow and burst violently during the vibration process, generating a strong impact force to achieve the purpose of cleaning the filter cloth. Ultrasonic cleaning can penetrate deep into the filter cloth fiber, effectively remove stubborn stains and tiny particles, has a good cleaning effect, and does not require mechanical contact and will not damage the filter cloth. Ultrasonic cleaning equipment is expensive, consumes a lot of energy during operation, and there may be a potential risk of damage to some special material filter cloths.

[0007] Chemical immersion method: Pure physical cleaning cannot deeply clean the clogging particles in the pores or between the fibers of the filter cloth, while the chemical cleaning method can achieve the purpose of cleaning by reacting the cleaning agent with the clogging solid particles. The combined use of physical cleaning and chemical cleaning can more effectively clean and regenerate the filter cloth. However, the cleaning agent may cause irreversible damage to the filter cloth, and the leakage of the cleaning agent may also cause environmental pollution.

[0008] In summary, when cleaning filter cloth using existing technologies, traditional physical cleaning has poor effect, but low cost; the cleaning effect of automatic cleaning equipment will gradually decline, and later maintenance is difficult; ultrasonic cleaning has the best cleaning effect, but it is costly, highly technical, and difficult to maintain; although the chemical immersion method has a lower cost, its concentration has a greater impact on the service life of the filter cloth. Summary of the invention

[0009] In order to solve the above problems, the present invention provides a regeneration device and a use method for filter cloth of a plate and frame filter press.

[0010] The technical solution of the present invention is: A regeneration device for filter cloth of a plate and frame filter press, the device body comprising a drying bin and a soaking bin arranged adjacent to each other, the drying bin and the soaking bin being connected by a traveling crane, a squeezing roller being arranged in the middle of the drying bin, a plurality of filter cloth hangers being arranged in the middle of the soaking bin, a ceramic residual material trough being arranged at the bottom of the soaking bin, a gas-boiling pipe being arranged above the ceramic residual material trough, the gas-boiling pipe being connected to a steam pipeline, and a reagent delivery pipe being connected to the soaking bin.

[0011] Preferably, the squeezing rollers are driven by roller motors.

[0012] Preferably, the carriage is placed on a carriage track.

[0013] Preferably, a drainage line is provided at the bottom of the ceramic residual material trough, the lowest point of the drainage line is connected to a slurry pipeline, and the slurry pipeline is connected to a slurry pump.

[0014] Preferably, a steam control valve is provided on the steam pipeline.

[0015] Preferably, the gas boiling tube is curved.

[0016] The method for using the regeneration device for filter cloth of a plate-and-frame filter press comprises the following steps: (1) After using the plate and frame filter press to filter the tailings, the filter cloth is cleaned and the filter cloth is placed in the soaking tank of the above device for soaking; (2) After cleaning, the filter cloth enters the drying chamber for drying.

[0017] Preferably, the soaking agent used in the soaking step includes the following components in mass fraction: 4%-8% oxalic acid, 3%-6% sodium phosphate, 1%-5% sodium dodecyl sulfate, 1%~4% sodium ethylenediaminetetraacetate, 1%-5% aminotrimethylphosphonic acid, and the rest is water; The concentration of the soaking agent is 30-50%; Further preferably, the soaking agent further comprises the following components in terms of mass fraction: 2%-15% hydrochloric acid, 4-8% Pluronic F-127.

[0018] Preferably, in step (1) of the method, the soaking temperature is 20-40°C, the soaking time is 2-20 hours, and the gas pressure introduced into the gas boiling tube during the soaking process is 0.3-0.8 MPA; further preferably, the soaking temperature is 40°C, the soaking time is 4 hours, and the gas pressure introduced into the gas boiling tube during the soaking process is 0.6 MPA.

[0019] The beneficial effects of the present invention are: 1. The filter cloth of the plate and frame filter press can be reused by air-boiling cleaning, soaking, extrusion shaping and drying, thereby reducing production costs and improving economic efficiency.

[0020] 2. Provide a method for cleaning and recycling the filter cloth for phosphate tailings filtering. The method of chemical immersion is used to determine the optimal immersion concentration, temperature and time of the hydrochloric acid cleaning agent. In combination with the principle of ultrasonic cleaning, the filter cloth immersion cleaning device is creatively used to add a bottom inflation pipeline to the immersion cleaning agent storage tank, which generates countless tiny bubbles that float up and collide with the liquid surface of the filter cloth immersion cleaning device to cause an explosion, thereby separating the solid particles of the filter cloth that are immersed in the hydrochloric acid immersion cleaning liquid, greatly improving the efficiency of chemical immersion, shortening the immersion time and protecting the filter cloth.

[0021] 3. This method is used to recycle the undamaged and discarded old filter cloth produced in the process of phosphate ore flotation and beneficiation, and a complete set of processes for filter cloth use, soaking, cleaning and recycling is established, thus realizing the cleaning and recycling of the undamaged and discarded old filter cloth.

[0022] 4. Combine the chemical immersion method with bottom inflation, use the most reasonable immersion cleaning agent concentration and immersion time, the cleaning agent immersion makes the crystal particles of the undamaged old filter cloth separate from the filter cloth fibers and pores, the bottom inflation forms a bubble explosion similar to ultrasonic cavitation, and separates the solid particles from the filter cloth fibers and pores. It not only has the low cost and easy operation of chemical immersion, but also achieves high efficiency similar to ultrasonic cleaning, reduces the concentration of hydrochloric acid cleaning agent, reduces the immersion time of the undamaged old filter cloth, saves a lot of labor, and reduces the waste of filter cloth.

[0023] 5. The process flow of the present invention is simple, no extra waste is generated, and the cleaning and recycling of the filter cloth for phosphate tailings filtering is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall assembly of the present invention. Figure 2 It is the overall front view of the present invention; Figure 3 Left and right views of the subject; Figure 4 It is a schematic diagram of the installation of the ceramic residual material tank 7, the curved gas boiling tube 12 and the filter cloth hanger slot; Figure 5 This is the front view of the steel structure; Figure 6 This is a top view of the steel structure; Figure 7 Schematic diagram of steel structure; In the figure: drying bin 1, soaking bin 2, extrusion roller 3, crane track 4, filter cloth hanger 5, steam control valve 6, ceramic residual material trough 7, slurry pump 8, crane 9, reagent conveying pipe 10, roller motor 11, low-pressure steam pipe 12, slurry pipeline 13, curved gas-boiling pipe 14.

[0025] Figure 8The light transmission effect diagram of the filter cloth before cleaning of the present invention; Fig. 9 The light transmission effect diagram of the filter cloth after cleaning of the present invention; Fig.10 New filter cloth light transmission effect diagram; Fig.11 Cleaning effect diagram before adding hydrochloric acid; Fig.12 Cleaning effect diagram after adding hydrochloric acid; Fig.13 Diagram of filter cloth perforation and reduced cleaning effect; Fig.14 The cleaning effect is significantly improved and the filter cloth structural strength is reduced; Fig.15 Cleaning effect diagram after adjusting the concentration of the reagent; Fig.16 The cleaning effect after increasing the air pressure of the inflation line; Fig.17 Cleaning effect diagram after reducing the soaking time. DETAILED DESCRIPTION

[0026] The following will be combined with the specific embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0027] Example 1 A regeneration device for filter cloth of a plate and frame filter press, the device body comprising a drying bin 1 and a soaking bin 2 arranged adjacent to each other, the drying bin 1 and the soaking bin 2 being connected via a crane 9, an extrusion roller 3 being provided in the middle of the drying bin 1, a plurality of filter cloth hangers 5 being provided in the middle of the soaking bin 2, a ceramic residual material trough 7 being provided at the bottom of the soaking bin 2, a gas boiling pipe 14 being provided above the ceramic residual material trough 7, the gas boiling pipe 14 being connected to a steam pipeline 12, and a reagent delivery pipe 10 being connected to the soaking bin 2.

[0028] Preferably, the squeezing roller 3 is driven by a roller motor 11 .

[0029] Preferably, the carriage 9 is placed on the carriage track 4 .

[0030] Preferably, a drainage line is provided at the bottom of the ceramic residual material trough 7 , and the lowest point of the drainage line is connected to the slurry pipeline 13 , and the slurry pipeline 13 is connected to the slurry pump 8 .

[0031] Preferably, a steam control valve 6 is provided on the steam pipeline 12 .

[0032] Preferably, the gas boiling tube 14 is curved.

[0033] Figure 1 As shown, ① install the steel structure materials and steel plates Figure 5 , Figure 6 , Figure 7 1. Assemble the steel structure foundation; 2. Weld the drying bin 1 and the soaking bin 2 coplanarly to form the main body of the device; 3. Install two 2-meter-long squeezing rollers 3 at the middle of the drying bin 1 2 meters away from the bottom and drive them at one end with a roller motor 11; 4. Install multiple 2-meter-long filter cloth hangers 5 at the middle of the soaking bin 2 1.9 meters away from the bottom; 5. Set a driving track 4 at 4 meters from the bottom of the drying bin 1 and the soaking bin 2, and use a driving crane 9 to hoist and move the filter cloth hanger 5; 6. Place a ceramic residual material trough 7 made of glazed ceramics at the bottom of the soaking bin 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 evenly distributed with air holes is horizontally arranged 0.2 meters above the ceramic residual material trough 7, one end of which is sealed, and one end is connected to the low-pressure steam pipeline 12, and 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 bin 2 for reagent replenishment; ⑨ The ceramic residual material trough 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 cleaning and extracting the slurry.

[0034] Example 2 The method for using the regeneration device for filter cloth of a plate-and-frame filter press comprises the following steps: (1) After filtering the tailings using a plate and frame filter press, the filter cloth is cleaned and the filter cloth is placed in the soaking tank 2 of the above-mentioned device for soaking; (2) After cleaning, the filter cloth enters the drying chamber 1 for drying.

[0035] The soaking agent used in step (1) of the method comprises the following components in terms of mass fraction: 5% oxalic acid, 4% sodium phosphate, 4% sodium dodecyl sulfate, 3% sodium ethylenediaminetetraacetate, 4% aminotrimethylphosphonic acid, the rest is water; The concentration of the soaking agent is 50%; In step (1), the soaking temperature is 24° C. and the soaking time is 24 h. During the soaking process, the gas pressure introduced into the gas boiling tube 14 is 0.3 MPa.

[0036] See Figure 9-11 From the softness and light transmittance, we can see that most of the scale on the filter cloth has been washed off by the cleaning liquid. The regular circle-shaped shadows in the figure are creases caused by the long-term pressure of the filter press.

[0037] Example 3 Based on Example 1, the comparison of the soaking agent was changed. Example 3-1: The soaking agent also includes the following components in mass fraction: 8% hydrochloric acid.

[0038] Example 3-2: The soaking agent also includes the following components in terms of mass fraction: 8% hydrochloric acid, 6% Pluronic F-127 (molecular formula: HO·(C2H4O) 196 ·(C3H6O) 67 H, its CMC value is 2.8×10 -6 (mol·dm -3 ), HLB value 22.0 (Caisson Labs, USA).

[0039] See Table 1 for details.

[0040] Table 1 Hydrochloric acid addition immersion test

[0041] Before adding hydrochloric acid, the cleaning condition is poor, see Fig.11 , 20 filter cloths were spread out as far as possible and placed in the cleaning solution with hydrochloric acid added, and then taken out after soaking for 24 hours. When taken out, it was found that the cleaning effect was improved. The filter cloth on the upper layer of the liquid in the pool was intact, while the filter cloth on the lower layer near the bottom of the pool was damaged and hardened severely. The damage was as follows Fig.12 However, adding 6% Pluronic F-127 to hydrochloric acid can reduce the breakage rate.

[0042] Example 4 Based on Example 3-2, the soaking time was adjusted in the experiment, as shown in Table 2.

[0043] Table 2

[0044] 20 filter cloths were spread out as far as possible and placed in the cleaning solution with hydrochloric acid added, and then taken out after soaking for 18 hours. When taken out, it was found that the cleaning effect was reduced and the hardening was relieved. According to statistics, 10 pieces were damaged, and the damage rate was 50%. The damage situation is as follows Fig.13 .

[0045] Example 5 Based on Example 3-2, the soaking temperature was adjusted, as shown in Table 3.

[0046] Table 3

[0047] 20 filter cloths were spread out as far as possible and placed in the cleaning solution with hydrochloric acid added. They were taken out after soaking for 18 hours and the soaking temperature was raised to 40°C. When they were taken out, it was found that the cleaning effect was significantly improved, but the structural strength of the filter cloth was reduced and the damage was aggravated. According to statistics, 11 pieces were damaged, and the damage rate was 55%. The cleaning situation is as follows Fig.14 .

[0048] Example 6 Based on Example 3-2, the concentration of the soaking agent was adjusted, as shown in Table 4.

[0049] Table 4

[0050] 20 filter cloths were spread out as far as possible and placed in the cleaning solution with hydrochloric acid added. They were taken out after soaking for 18 hours. The soaking temperature was raised to 40°C and the concentration of the agent was reduced to 30%. When the filter cloths were taken out, the cleaning effect was reduced, but the structural strength of the filter cloth was retained and the damage was reduced. According to statistics, 8 pieces were damaged, and the damage rate was 40%. The cleaning situation is as follows Fig.15 .

[0051] Example 7 Based on Example 3-2, adjust the air pressure of the inflation line, as shown in Table 5 for details.

[0052] Table 5

[0053] 20 filter cloths were spread out as far as possible and placed in the cleaning solution with hydrochloric acid added. They were taken out after soaking for 18 hours. The soaking temperature was 40℃, the concentration of the agent was 30%, and the inflation pressure was increased to 0.6MPA. When they were taken out, it was found that the cleaning effect was as expected, but the damage of the filter cloth increased. According to statistics, 7 pieces were damaged, and the damage rate was 35%. The cleaning situation is as follows Fig.16 .

[0054] Example 8 Based on Example 3-2, the soaking time was adjusted, as shown in Table 6.

[0055] Table 6

[0056] 20 filter cloths were spread out as far as possible and placed in the cleaning solution with hydrochloric acid added. They were soaked for 4 hours and then taken out. The soaking temperature was 40℃, the concentration of the agent was 30%, and the inflation pressure was 0.6MPA. When they were taken out, it was found that the cleaning effect was as expected, but the filter cloth was not damaged. The cleaning situation is as follows Fig.17 . The standard parts used in the present invention can all be purchased from the market, and the special-shaped parts can be customized according to the description and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0057] In the drawings of the embodiments disclosed in the present invention, only the structures involved in the embodiments disclosed in the present invention are involved. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other. The technical scheme of the present invention is explained by the above embodiments, but the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must rely on the above specific embodiments to be implemented. Any improvements made by technical personnel in the relevant field on the basis of the present invention, or equivalent replacement of the materials selected by the present invention, etc., all fall within the scope of protection of the patent.

Claims

1. A regeneration device for filter cloth of a plate-and-frame filter press, the main body of the device comprising a drying bin (1) and a soaking bin (2) arranged adjacent to each other, characterized in that: The drying bin (1) and the soaking bin (2) are connected by being arranged on a traveling crane (9); a squeezing roller (3) is arranged in the middle of the drying bin (1); a plurality of filter cloth hangers (5) are arranged in the middle of the soaking bin (2); a ceramic residual material trough (7) is arranged at the bottom of the soaking bin (2); a gas boiling pipe (14) is arranged above the ceramic residual material trough (7); the gas boiling pipe (14) is connected to a steam pipeline (12); and a medicine conveying pipe (10) is connected to the soaking bin (2).

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

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

4. The regeneration device for filter cloth of a plate and frame filter press according to claim 1, characterized in that: A drainage line is provided at the bottom of the ceramic residual material trough (7), the lowest point of the drainage line is connected to a slurry pipeline (13), and the slurry pipeline (13) is connected to a slurry pump (8).

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

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

7. The method for using the regeneration device for filter cloth of a plate and frame filter press according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: (1) After filtering the tailings using a plate and frame filter press, the filter cloth is cleaned and the filter cloth is placed in the soaking tank (2) of the above-mentioned device for soaking; (2) After cleaning, the filter cloth enters the drying chamber (1) for drying.

8. The method for using the regeneration device for filter cloth of a plate and frame filter press according to any one of claims 1 to 7, characterized in that: The soaking agent used in step (1) of the method comprises the following components in terms of mass fraction: 4%-8% oxalic acid, 3%-6% sodium phosphate, 1%-5% sodium dodecyl sulfate, 1%~4% sodium ethylenediaminetetraacetate, 1%-5% aminotrimethylphosphonic acid, and the rest is water; The concentration of the soaking agent is 30-50%.

9. The method for using the regeneration device for filter cloth of a plate and frame filter press according to any one of claims 1 to 7, characterized in that: The soaking agent also includes the following components in terms of mass fraction: 2%-15% hydrochloric acid, 4-8% Pluronic F-127.

10. The method for using the regeneration device for filter cloth of a plate and frame filter press according to any one of claims 1 to 7, characterized in that: In step (1) of the method, the soaking temperature is 20-40°C, the soaking time is 2-20 hours, and the gas pressure introduced into the gas boiling tube during the soaking process is 0.3-0.8 MPA; preferably, the soaking temperature is 40°C, the soaking time is 4 hours, and the gas pressure introduced into the gas boiling tube during the soaking process is 0.6 MPA.

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