Glass etching waste solution treatment tank and treatment tank use method

Abstract

This invention discloses a glass etching waste liquid treatment tank and a method for using the treatment tank. The glass etching waste liquid treatment tank includes a tank body, a composite membrane, and a discharge valve. An outlet is provided at the bottom of the tank body, and the discharge valve is installed outside the outlet. The composite membrane can cover the open portion of the tank body. The composite membrane includes a sealing layer, a liquid-coated layer, and a liquid outlet pipe. The sealing layer and the liquid-coated layer are fixedly connected, with a gap between them. The liquid outlet pipe is located between the liquid-coated layer and the sealing layer. When the composite membrane covers the open portion, the sealing layer is on top, and the liquid-coated layer is on the bottom. Multiple outlets are provided on the liquid outlet pipe, and multiple through holes are provided on the liquid-coated layer. Liquid can be discharged from the outlets. The liquid adheres to the gap between the liquid-coated layer and the sealing layer and / or the through holes, effectively reducing the diffusion of hydrogen fluoride volatilized from the treatment tank into the air.

Description

Technical Field

[0001] This invention belongs to the field of chemical waste treatment, specifically relating to a glass etching waste liquid treatment tank and a method for using the treatment tank. Background Technology

[0002] Hydrofluoric acid is the most commonly used treatment medium in glass etching. After etching, the resulting waste liquid still contains a high concentration of hydrogen fluoride, and direct discharge would cause serious environmental harm. Currently, the main industrial method for treating this type of waste liquid is reaction precipitation. This involves adding slaked lime (calcium hydroxide) to the hydrogen fluoride-containing waste liquid, which reacts chemically to form insoluble calcium fluoride precipitate, thereby achieving the removal and solidification of fluoride.

[0003] In actual production, two types of reaction vessels are commonly used: reaction kettles and reaction tanks. Reaction kettles are closed systems that effectively prevent the diffusion of potentially volatile hydrogen fluoride gas into the air during the reaction, offering good environmental safety. However, reaction kettles are mostly made of metal, and although they are usually coated with anti-corrosion coatings, these coatings are prone to aging and damage over time, leading to corrosion of the metal substrate by hydrofluoric acid and subsequent problems such as corrosion and leakage. Furthermore, the maintenance cost of reaction kettles is relatively high, and the repair process is also relatively complex.

[0004] In comparison, reaction tanks have lower construction costs and are easier to maintain, offering significant economic advantages and operational convenience. However, reaction tanks are typically open-top designs. During the neutralization reaction between hydrofluoric acid and quicklime, heat is released, causing residual hydrogen fluoride to volatilize and enter the atmosphere, resulting in air pollution and posing a health threat to operators. Furthermore, calcium fluoride often accumulates at the emission point, affecting emissions. Summary of the Invention

[0005] The purpose of this invention is to provide a glass etching waste liquid treatment tank and a method for using the treatment tank, which can effectively reduce the diffusion of hydrogen fluoride volatilized from the treatment tank into the air.

[0006] The technical solution is as follows:

[0007] A glass etching waste liquid treatment tank includes a tank body, a composite membrane, and a discharge valve. An outlet is located at the bottom of the tank body, and the discharge valve is installed outside the outlet. The composite membrane can cover the open portion of the tank body and is made of corrosion-resistant material; the composite membrane includes a sealing layer, a liquid-coated layer, and an outlet pipe. The sealing layer and the liquid-coated layer are fixedly connected, with a gap between them. The outlet pipe is located between the liquid-coated layer and the sealing layer, or on the side of the liquid-coated layer facing away from the sealing layer. When the composite membrane covers the open portion, the sealing layer is on top, and the liquid-coated layer is on the bottom. Multiple outlets are provided on the outlet pipe, and multiple through holes are provided on the liquid-coated layer. Liquid can be discharged from the outlets, and the liquid adheres to the gap between the liquid-coated layer and the sealing layer and / or the through holes, allowing gas to contact the liquid when it rises.

[0008] In one embodiment, the liquid-attached layer is provided with a protruding support portion, which is fixedly connected to the sealing layer, thereby forming the gap between the liquid-attached layer and the sealing layer.

[0009] In one embodiment, the liquid layer is further provided with a pipe mounting position, the pipe mounting position protrudes from the surface of the liquid layer, and the middle of the pipe mounting position is recessed to accommodate the liquid outlet pipe, and the support portion is arranged at intervals with the pipe mounting position.

[0010] In one embodiment, the pipe mounting positions are arranged in rows, and each row of pipe mounting positions has a liquid outlet pipe. The liquid outlet pipe has multiple liquid outlets. When the liquid outlet pipe is filled with liquid, the liquid is discharged along the liquid outlets and adheres to the gaps and / or the through holes.

[0011] In one embodiment, a metal support layer is provided inside the sealed layer so that the sealed layer can be supported when it is deployed.

[0012] In one embodiment, at least two outlets are provided, and the distance between the outlets and the bottom of the pool is different. A corrosion-resistant filter assembly is installed on the inner side of each outlet. The filter assembly includes a base and a filter screen, and the filter screen can be used to filter precipitated calcium fluoride.

[0013] In one embodiment, the filter assembly further includes a support ring and an elastic element. The base has a stepped position, and the support ring is installed on the lower side of the stepped position, such that a gap space is formed between the outer side of the support ring and the inner side of the base. The elastic element is installed in the gap space. When the elastic element is in a free state, it protrudes from the top surface of the support ring. The outer diameter of the filter screen is smaller than the inner diameter of the base and larger than the outer diameter of the support ring, so that the filter screen line contacts the elastic element. When the elastic element is further squeezed, the filter screen contacts the support ring.

[0014] In one embodiment, at least two trigger switches are installed on the support ring facing the filter screen. The trigger switches are located inside the support ring, with the triggering part facing the filter screen. A cable routing hole is opened on the side of the base near the pool wall, and the cable of the trigger switch passes through the cable routing hole. When the filter screen is pushed to contact the two trigger switches and a preset time is reached, a signal is transmitted to the outside through the cable.

[0015] In one embodiment, the elastic element is made of a corrosion-resistant material and has a cross-section consisting of multiple interconnected C-shaped structures.

[0016] The method of using the glass etching waste liquid treatment tank includes the following steps:

[0017] The glass etching waste liquid to be treated is injected into the pool;

[0018] The composite membrane is unfolded and covered at the opening of the pool. A liquid that can dissolve or react with hydrogen fluoride is introduced into the outlet pipe. The liquid sprays out from the outlet of the outlet pipe and adheres to the gap and through holes between the liquid layer and the sealed layer to form a liquid film.

[0019] When treating glass etching waste liquid, the generated hydrogen fluoride volatiles can dissolve or react with the hydrogen fluoride when they come into contact with the liquid film on the composite membrane.

[0020] After the glass etching waste liquid to be treated has completed the reaction, clean water is introduced into the outlet pipe. The clean water sprays out from the outlet, washing away the liquid that has reacted or dissolved hydrogen fluoride into the pool, thus completing the cleaning of the composite membrane.

[0021] The technical solution provided by this invention has the following advantages and effects:

[0022] During operation, the glass etching waste liquid to be treated is injected into the tank. This waste liquid contains hydrogen fluoride, i.e., hydrofluoric acid. The composite membrane is then unfolded and placed over the open end of the tank. Liquid, specifically water, is then injected into the outlet pipe. The liquid flows out through the outlet and enters the gap between the liquid-attached layer and the sealed layer, as well as the through-holes. Due to the adhesion of water, it adheres to these gaps and through-holes, forming a water film on the composite membrane. During waste liquid treatment, lime milk (calcium hydroxide) is added. Calcium ions react with fluoride ions to form calcium fluoride precipitate. This reaction is exothermic, causing the waste liquid to absorb heat. A small amount of hydrogen fluoride will volatilize. The volatilized hydrogen fluoride rises through the water film on the composite membrane. Since hydrogen fluoride is readily soluble in water, the volatilized hydrogen fluoride dissolves in the water. Therefore, most of the volatilized hydrogen fluoride is blocked and dissolved in the water film, thus preventing further volatilization. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the glass etching waste liquid treatment tank of the present invention;

[0024] Figure 2 This is a schematic diagram of the exploded structure of the glass etching waste liquid treatment tank of the present invention;

[0025] Figure 3 This is a schematic diagram of the exploded structure of the composite membrane in the glass etching waste liquid treatment tank of the present invention.

[0026] Figure 4 This is a schematic diagram showing the installation position of the outlet pipe and the attached liquid layer of the glass etching waste liquid treatment tank of the present invention.

[0027] Figure 5 This is a schematic diagram of the installation cross-section of the outlet pipe and the attached liquid layer of the glass etching waste liquid treatment tank of the present invention.

[0028] Figure 6 This is a schematic diagram of the installation cross-section of the sealed layer and the liquid-attached layer of the glass etching waste liquid treatment tank of the present invention.

[0029] Figure 7 This is a schematic diagram of the internal structure of the sealed layer of the glass etching waste liquid treatment tank of the present invention.

[0030] Figure 8 This is a three-dimensional structural diagram of the filter assembly of the glass etching waste liquid treatment tank of the present invention;

[0031] Figure 9 This is an exploded structural diagram of the filter assembly of the glass etching waste liquid treatment tank of the present invention.

[0032] Figure 10 This is a schematic cross-sectional view of the filter assembly of the glass etching waste liquid treatment tank of the present invention.

[0033] Figure 11 The glass etching waste liquid treatment tank of the present invention Figure 8 Enlarged structural diagram at point A in the middle.

[0034] Explanation of reference numerals in the attached figures:

[0035] 10. Tank body; 11. Outlet; 20. Composite membrane; 21. Sealing layer; 211. Metal support layer; 22. Liquid layer; 221. Through hole; 222. Mounting position; 223. Support part; 23. Outlet pipe; 232. Outlet; 24. Gap; 30. Discharge valve body; 40. Filter assembly; 41. Base; 411. Step position; 412. Cable routing hole; 42. Support ring; 421. Trigger switch; 43. Filter screen; 44. Elastic element; 45. Locking device. Detailed Implementation

[0036] To facilitate understanding of the present invention, specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

[0037] Unless otherwise specified or defined, the terms "first," "second," etc., used herein are for distinguishing names only and do not represent a specific quantity or order. Unless otherwise specified or defined, the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. It should be noted that "fixed to" or "connected to" in this document can mean directly fixed to or connected to an element, or indirectly fixed to or connected to an element.

[0038] See Figures 1 to 6 As shown, a glass etching waste liquid treatment tank includes a tank body 10, a composite membrane 20, and a discharge valve body 30. A discharge outlet 11 is provided at the bottom of the tank body 10, and the discharge valve body 30 is installed on the outside of the discharge outlet 11. The composite membrane 20 can cover the open portion of the tank body 10. The composite membrane 20 can be rolled up and stored, and it is made of corrosion-resistant material. The composite membrane 20 includes a sealing layer 21, a liquid-attached layer 22, and a discharge pipe 23. The sealing layer 21 is fixedly connected to the liquid-attached layer 22, and a gap 24 exists between the liquid-attached layer 22 and the sealing layer 21. The discharge pipe 23 is located... Between the liquid-attached layer 22 and the sealing layer 21, or when the liquid outlet pipe 23 is located on the side of the liquid-attached layer 22 facing away from the sealing layer 21, the composite membrane 20 covers the opening, with the sealing layer 21 on the upper side and the liquid-attached layer 22 on the lower side; the liquid outlet pipe 23 has multiple liquid outlets 232, and the liquid-attached layer 22 also has multiple through holes 221, through which liquid can be discharged. The liquid adheres to the gap 24 and / or the through holes 221 between the liquid-attached layer 22 and the sealing layer 21, and can come into contact with the liquid when the gas rises.

[0039] In use, the glass etching waste liquid to be treated is injected into the pool 10. At this time, the glass etching waste liquid contains hydrogen fluoride, i.e., hydrofluoric acid. The composite membrane 20 is unfolded and covers the opening of the pool 10. At this time, liquid is injected into the outlet pipe 23. Specifically, water is injected in this embodiment. The liquid is discharged through the outlet 232 and enters the gap 24 between the liquid-attached layer 22 and the sealing layer 21 and the through hole 221. Due to the adhesion of water, it will adhere to the gap 24 between the liquid-attached layer 22 and the sealing layer 21 and the through hole 221, thus forming a water film on the composite membrane 20. When treating waste liquid, lime milk, whose main component is calcium hydroxide, is added to the waste liquid. Calcium ions react with fluoride ions to form calcium fluoride precipitate. This reaction is exothermic, causing the waste liquid to absorb heat. A small amount of hydrogen fluoride will volatilize. The volatilized hydrogen fluoride rises through the water film on the composite membrane 20. Since hydrogen fluoride is easily soluble in water, the volatilized hydrogen fluoride dissolves in the water. Therefore, most of the volatilized hydrogen fluoride is blocked by the water film and dissolved in the water film, thus achieving the effect of preventing hydrogen fluoride volatilization.

[0040] Furthermore, the sealed layer 21 of the composite membrane 20 has a complete membrane structure on its surface, so hydrogen fluoride will not evaporate through the areas not covered by the water film. Moreover, the sealed layer 21 can reduce the flow of gas across the water film surface, reduce water film evaporation, and prevent the water film from being directly irradiated and thus avoid the re-evaporation of hydrogen fluoride.

[0041] To prevent the water film from rupturing and decreasing, water can be injected into the outlet pipe 23 at intervals to replenish the ruptured water film.

[0042] Compared to direct spraying, this solution uses a water film method, which can save a significant amount of water resources. After the waste liquid is treated, water is continuously injected into the outlet pipe 23, meaning water can exit from the outlet 232. The water used to dilute the water film falls into the tank 10, ultimately achieving the effect of removing the original water film water, thereby removing hydrogen fluoride from the water film.

[0043] See Figure 3 and Figure 4 As shown, the liquid layer 22 adopts a grid structure, that is, the mesh is a through hole 221. Water can adhere along the edge of the mesh by utilizing its adhesion force, so that a water film is also formed at the through hole 221.

[0044] In other embodiments, multiple liquid layers 22 can be provided, and the multiple liquid layers 22 can be stacked on top of each other, or the multiple liquid layers 22 can be stacked in a staggered manner, so that the through holes 221 are staggered, which can better form a water film.

[0045] See Figure 3 , Figure 4 and Figure 6 As shown, the liquid-coated layer 22 is provided with a protruding support portion 223, which is fixedly connected to the sealing layer 21, thereby forming the gap 24 between the liquid-coated layer 22 and the sealing layer 21. The connection between the protruding support portion 223 and the sealing layer 21 achieves a fixed connection between the liquid-coated layer 22 and the sealing layer 21, thus forming an integral composite membrane 20. Because the support portion 223 is a protruding structure, it can separate the liquid-coated layer 22 and the sealing layer 21, resulting in a gap 24 between them. Water flowing out of the outlet 232 can diffuse through the gap 24 to different positions of the through holes 221, thereby forming a water film in the through holes 221. Here, the support portion 223 is fixedly connected to the sealing layer 21 by adhesive bonding.

[0046] In other embodiments, the support portion 223 can be provided separately, with the liquid-coated layer 22 and the sealing layer 21 fixed at both ends respectively. Additionally, a protruding structure is provided in the middle of the support portion 223 to separate the liquid-coated layer 22 and the sealing layer 21. Alternatively, the support portion 223 can be disposed on the sealing layer 21, and then the support portion 223 is fixedly connected to the liquid-coated layer 22.

[0047] See Figures 3 to 5 As shown, the liquid-coated layer 22 is also provided with a pipe mounting position 222. The pipe mounting position 222 protrudes from the surface of the liquid-coated layer 22, and the middle of the pipe mounting position 222 is recessed to accommodate the outlet pipe 23. The support part 223 is arranged at intervals with the pipe mounting position 222. Since the outlet pipe 23 needs a relatively fixed position to ensure that the water can fall relatively evenly into the gap 24 and through hole 221 between the liquid-coated layer 22 and the sealing layer 21 when it is discharged, the central recessed position can relatively fix the position of the outlet pipe 23. Moreover, the spaced arrangement can prevent the support part 223 from blocking the outlet 232.

[0048] See Figure 4 As shown, the support 223 and the pipe mounting position 222 are located on the same side of the liquid layer 22 and have the same protrusion height. Therefore, the space created by the support 223 between the liquid layer 22 and the sealing layer 21 can also accommodate the liquid outlet pipe 23. The liquid exiting the liquid outlet pipe 23 falls directly into the gap 24. This improves the water film formation rate and ultimately helps to improve the water film coverage.

[0049] See Figures 3 to 6As shown, the pipe mounting positions 222 are arranged in rows, and each row of pipe mounting positions 222 has a liquid outlet pipe 23. The liquid outlet pipe 23 has multiple liquid outlets 232. When the liquid outlet pipe 23 is filled with liquid, the liquid is discharged along the liquid outlets 232 and adheres to the gaps 24 and / or the through holes 221. Multiple rows can be arranged in this way, and the liquid outlets 232 on each row of liquid outlet pipes 23 correspond to part of the gaps 24 and part of the through holes 221, so that the water fills the gaps 24 and through holes 221 more evenly.

[0050] Specifically, see Figure 3 and Figure 4 As shown, the through holes 221 are arranged in rows, with a pipe mounting position 222 set for every two rows of through holes 221, and a support section 223 set every two rows of through holes 221. The support section 223 has a cylindrical structure and is set at the joint of adjacent through holes 221. Therefore, each outlet pipe 23 is responsible for filling the two rows of through holes 221 on its left and right and the gap 24, which is more effective. In addition, the setting of the support column will not block the water flow between adjacent through holes 221, so even if some outlets 232 are blocked, the water flowing out of the other outlets 232 can flow into the through holes 221 near the blocked outlet 232.

[0051] See Figure 3 As shown, the inlet ends of multiple outlet pipes 23 are all connected to a main pipe, and water is introduced into the main pipe and then distributed to each outlet pipe 23. This method effectively reduces the number of pipe connections.

[0052] See Figure 3 and Figure 4 As shown, in this embodiment, the liquid outlet 232 is elongated, which can expand the liquid outlet area of ​​the liquid outlet 232, making it easier to adapt to the position of the gap 24 and the through hole 221, thereby forming a water film.

[0053] Furthermore, the outlet 232 can be designed as a crack. When the outlet pipe 23 is full, it needs to be pressurized. After pressurization, the water is squeezed out of the crack and sprayed out in the form of a water film. At this time, the water spraying method is more likely to form a water film when it falls into the gap 24 and the through hole 221.

[0054] Of course, the outlet 232 can also be set as a round hole, with multiple holes evenly distributed on the outlet tube 23.

[0055] In other embodiments, the liquid outlet pipe 23 can be installed below the liquid layer 22, with the direction of the liquid outlet 232 set obliquely upward. The liquid sprayed from the liquid outlet 232 can be sprayed onto the through hole 221, thereby forming a water film on the through hole 221.

[0056] In other embodiments, a separate spray pipe can be provided. When a water film needs to be formed, the spray pipe can be opened to spray directly onto the liquid layer 22.

[0057] See Figure 7 As shown, a metal support layer 211 is provided inside the sealed layer 21, which provides support when the sealed layer 21 is unfolded. The metal support layer 211 inside the sealed layer 21 is used to increase the strength of the sealed layer 21, facilitate the rolling and unfolding of the entire composite membrane 20, and the unfolded composite membrane 20 has support.

[0058] The sealed layer 21 uses a metal mesh inside, which is laid flat inside the sealed layer 21. The metal mesh can be set to ensure that the composite film 20 has a certain degree of flexibility when rolled up and stored, and a certain degree of rigid support when unfolded and used.

[0059] In this embodiment, the liquid-attached layer 22, the sealing layer 21, and the liquid outlet pipe 23 in the composite membrane 20 are all made of polyvinylidene fluoride (PVDF) to ensure excellent resistance to hydrogen fluoride corrosion. Of course, other materials with resistance to hydrogen fluoride corrosion can also be used.

[0060] like Figure 8 and Figure 9 As shown, at least two discharge outlets 11 are provided, with different distances between each discharge outlet 11 and the bottom of the tank body 10. A corrosion-resistant filter assembly 40 is installed inside each discharge outlet 11. The filter assembly 40 includes a base 41 and a filter screen 43, which is used to filter precipitates. After the reaction is complete, calcium fluoride precipitates at the bottom, requiring the discharge of the waste liquid. At this time, the lower discharge valve 30 can be opened to discharge the reacted liquid, while the filter screen 43 blocks the precipitates, thus only discharging the waste liquid. If there is a large amount of precipitate blocking the filter screen 43, the upper discharge valve 30 can be opened to discharge the waste liquid. Alternatively, the upper discharge valve 30 can be opened first, and the lower discharge valve 30 can be opened only after the liquid level is lower than the opened valve 30. This arrangement ensures that as much waste liquid as possible is discharged, facilitating subsequent treatment of the precipitates and preventing precipitates from being discharged with the waste liquid. In this embodiment, two discharge outlets 11 are provided. In other embodiments, there may be three or four discharge outlets 11. No specific limitation is made here.

[0061] See Figures 8 to 10As shown, the filter assembly 40 further includes a support ring 42 and an elastic member 44. The base 41 is provided with a step 411, and the support ring 42 is installed on the lower side of the step 411, so that a gap space is formed between the outer side of the support ring 42 and the inner side of the base 41. The elastic member 44 is installed on the gap space. When the elastic member 44 is in a free state, it protrudes from the top surface of the support ring 42. The outer diameter of the filter screen 43 is smaller than the inner diameter of the base 41 and larger than the outer diameter of the support ring 42, so that the filter screen 43 makes line contact with the elastic member 44. When the elastic member 44 is further squeezed, the filter screen 43 makes contact with the support ring 42.

[0062] The support ring 42 limits the movement of the filter screen 43. When liquid is discharged, the filter screen 43 is subjected to force and moves towards the outlet 11. It is first obstructed by the elastic element 44, thus preventing the filter screen 43 from moving further towards the outlet 11. As sediment gradually adheres to the filter screen 43, the permeability of the filter screen 43 decreases. At this time, the internal and external pressure difference increases, causing the filter screen 43 to squeeze the elastic element 44 and eventually contact the support ring 42, thereby stopping its further movement towards the outlet 11. After the sediment and waste liquid are treated, the filter needs to be rinsed again, and it can automatically reset itself.

[0063] Specifically, see Figure 11 As shown, at least two trigger switches 421 are installed on the support ring 42 facing the filter screen 43. The trigger switches 421 are located inside the support ring 42, with the triggering part facing the filter screen 43. The base 41 is opened with a cable routing hole 412 on the side near the wall of the pool body 10. The cable of the trigger switch 421 passes through the cable routing hole 412. When the filter screen 43 is pushed to contact the two trigger switches 421, the signal is transmitted to the outside through the cable.

[0064] When at least two trigger switches 421 are simultaneously activated for a preset time, it indicates that the filter screen 43 has shifted, meaning it is fully in contact with the support ring 42. At this time, the signals from the two trigger switches 421 are transmitted externally via cables, emitting corresponding signals. This can manifest as a buzzer alarm or an alarm message displayed on a screen. Specifically, in this embodiment, two trigger switches 421 are used. An alarm message is only emitted when both trigger switches 421 are activated simultaneously for a preset time, effectively preventing false alarms. This is because using a single trigger switch 421 can easily lead to accidental activation of the trigger switch 421 due to the filter screen 43 shifting to the side. Furthermore, setting a preset time avoids the alarm signal emitted by the filter screen 43 briefly contacting both trigger switches 421 simultaneously due to the instantaneous impact of water flow, such as the instantaneous impact of water flow when the discharge valve body 30 is opened. In this embodiment, the preset time is 2 seconds, meaning that an alarm message is only emitted after both trigger switches 421 are activated simultaneously for 2 seconds.

[0065] In other embodiments, three or four trigger switches 421 can be set, and can be configured to trigger all switches simultaneously or only two of them, and issue an alarm message after a preset time is met.

[0066] When an alarm is triggered, it indicates that filter 43 is clogged. Close the discharge valve 30 and open the valve higher than the bottom of the tank 10 to continue discharging the waste liquid. If the liquid level is now lower than the valve higher than the bottom of the tank 10, it means the liquid discharge is complete and the sediment can be cleaned.

[0067] See Figure 11 As shown, the elastic element 44 is made of a corrosion-resistant material, and its cross-section consists of multiple interconnected C-shaped structures. This design directly utilizes the elasticity of the C-shaped structures and the corrosion-resistant material itself, allowing it to automatically rebound and reset after compression.

[0068] In other embodiments, the cross section of the elastic element 44 can also be a W-shaped, U-shaped, or other structure. Essentially, the elastic element 44 has a cavity structure inside, which can be compressed.

[0069] See Figure 9 and Figure 10 As shown, the filter assembly 40 also includes a locking mechanism 45, which passes through the base 41 and holds the filter screen 43 between the locking mechanism 45 and the support ring 42. The locking mechanism 45 has a U-shaped structure, which allows for two positions to hold the filter screen 43, preventing the filter screen 43 from tilting.

[0070] In this embodiment, the filter assembly 40 can be externally wrapped with polyvinylidene fluoride (PVDF) to achieve corrosion resistance. Of course, other corrosion-resistant materials are also feasible, and no specific limitation is made here.

[0071] The method of using the glass etching waste liquid treatment tank includes the following steps:

[0072] The glass etching waste liquid to be treated is injected into the pool 10;

[0073] The composite membrane 20 is unfolded and covered at the opening of the pool body 10. A liquid that can dissolve or react with hydrogen fluoride is introduced into the liquid outlet pipe 23. The liquid is sprayed out from the outlet 232 of the liquid outlet pipe 23 and adheres to the gap 24 and the through hole 221 between the liquid layer 22 and the sealed layer 21 to form a liquid film.

[0074] When treating glass etching waste liquid, the generated hydrogen fluoride volatiles can dissolve or react with the hydrogen fluoride when they come into contact with the liquid film on the composite membrane 20.

[0075] After the glass etching waste liquid to be treated has completed the reaction, clean water is introduced into the outlet pipe 23. The clean water is sprayed out from the outlet 232, washing away the liquid that reacted or dissolved hydrogen fluoride into the pool body 10, thus completing the cleaning of the composite membrane 20.

[0076] Further, the glass etching waste liquid and precipitate after the reaction are removed, and one of the discharge outlets 11 is opened. If the filter component 40 of the discharge outlet 11 issues an alarm signal, the corresponding discharge outlet 11 is closed. The liquid discharge is completed when all discharge outlets 11 issue alarm signals or the liquid level in the pool 10 is lower than that of the non-alarm discharge outlets 11.

[0077] The ingenious aspect of this design is that it eliminates the need for manual removal of the composite membrane 20 to observe the location of the sediment from inside the tank 10. Instead, alarm signals can be used to determine the discharge status of the reaction liquid, allowing for the next step of the operation.

[0078] The above embodiments are not an exhaustive list based on the present invention, and there may be many other embodiments not listed. Any substitutions and improvements made without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A glass etching waste liquid treatment tank, characterized in that, The device includes a pool body, a composite membrane, and a discharge valve. The pool body has a discharge outlet at the bottom, and the discharge valve is installed on the outside of the discharge outlet. The composite membrane can cover the open part of the pool body, can be rolled up and stored, and is made of corrosion-resistant material. The composite membrane includes a sealing layer, a liquid-attached layer, and a liquid outlet pipe. The sealing layer is fixedly connected to the liquid-attached layer, and there is a gap between the liquid-attached layer and the sealing layer. The liquid outlet pipe is located between the liquid-attached layer and the sealing layer, or the liquid outlet pipe is located on the side of the liquid-attached layer facing away from the sealing layer. When the composite membrane covers the opening, the sealing layer is on the upper side and the liquid-attached layer is on the lower side. The liquid outlet pipe has multiple liquid outlets, and the liquid-attached layer also has multiple through holes. The liquid outlets can discharge liquid, and the liquid adheres to the gap and / or the through holes between the liquid-attached layer and the sealing layer. When the gas rises, it can come into contact with the liquid.

2. The glass etching waste liquid treatment tank according to claim 1, characterized in that, The liquid-attached layer is provided with a protruding support portion, which is fixedly connected to the sealing layer, so that the liquid-attached layer and the sealing layer form the gap.

3. The glass etching waste liquid treatment tank according to claim 2, characterized in that, The liquid layer is also provided with a pipe mounting position, which protrudes from the surface of the liquid layer and is recessed in the middle to accommodate the liquid outlet pipe. The support portion is arranged at intervals with the pipe mounting position.

4. The glass etching waste liquid treatment tank according to claim 3, characterized in that, The pipe installation positions are arranged in rows, and each row of pipe installation positions has a liquid outlet pipe. The liquid outlet pipe has multiple liquid outlets. When the liquid outlet pipe is filled with liquid, the liquid is discharged along the liquid outlet and adheres to the gap and / or the through hole.

5. The glass etching waste liquid treatment tank according to claim 1, characterized in that, The sealed layer has a metal support layer inside, which can support the sealed layer when it is unfolded.

6. The glass etching waste liquid treatment tank according to any one of claims 1 to 5, characterized in that, At least two outlets are provided, and the distance between each outlet and the bottom of the pool is different. A corrosion-resistant filter assembly is installed on the inner side of each outlet. The filter assembly includes a base and a filter screen, and the filter screen can be used to filter sediment.

7. The glass etching waste liquid treatment tank according to claim 6, characterized in that, The filter assembly further includes a support ring and an elastic element. The base is provided with a stepped position, and the support ring is installed on the lower side of the stepped position, so that a gap space is formed between the outer side of the support ring and the inner side of the base. The elastic element is installed on the gap space. When the elastic element is in its free state, it protrudes from the top surface of the support ring. The outer diameter of the filter screen is smaller than the inner diameter of the base and larger than the outer diameter of the support ring, so that the filter screen line contacts the elastic element. When the elastic element is further squeezed, the filter screen contacts the support ring.

8. The glass etching waste liquid treatment tank according to claim 7, characterized in that, At least two trigger switches are installed on the support ring facing the filter screen. The trigger switches are located inside the support ring, with the triggering part facing the filter screen. A cable routing hole is opened on the side of the base near the pool wall, and the cable of the trigger switch passes through the cable routing hole. When the filter is pushed to contact the two trigger switches and a preset time is reached, a signal is transmitted to the outside via a cable.

9. The glass etching waste liquid treatment tank according to claim 7, characterized in that, The elastic element is made of corrosion-resistant material and has a cross-section consisting of multiple interconnected C-shaped structures.

10. A method for using a glass etching waste liquid treatment tank, characterized in that, Using the glass etching waste liquid treatment tank according to any one of claims 1 to 9 includes the following steps: The glass etching waste liquid to be treated is injected into the pool; The composite membrane is unfolded and covered at the opening of the pool. A liquid that can dissolve or react with hydrogen fluoride is introduced into the outlet pipe. The liquid sprays out from the outlet of the outlet pipe and adheres to the gap and through holes between the liquid layer and the sealed layer to form a liquid film. When treating glass etching waste liquid, the generated hydrogen fluoride volatiles can dissolve or react with the hydrogen fluoride when they come into contact with the liquid film on the composite membrane. After the glass etching waste liquid to be treated has completed the reaction, clean water is introduced into the outlet pipe. The clean water sprays out from the outlet, washing away the liquid that has reacted or dissolved hydrogen fluoride into the pool, thus completing the cleaning of the composite membrane.

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