Hydrofluoric acid waste liquid recycling and treating system adopting tubular membrane

Abstract

The utility model discloses a hydrofluoric acid waste liquid reuse and treatment system adopting a tubular membrane, which comprises a waste liquid concentration tank, the tubular membrane and a hydrofluoric acid recovery tank, the tubular membrane is connected to one side of the waste liquid concentration tank, the hydrofluoric acid recovery tank is connected to one side of the tubular membrane away from the waste liquid concentration tank, and the hydrofluoric acid recovery tank is connected to the other side of the tubular membrane away from the waste liquid concentration tank. The bottom end of the liquid waste concentration tank is arranged in a conical shape, the bottom end of the liquid waste concentration tank is connected with a lime reaction tank, one side of the lime reaction tank is connected with a plate-and-frame filter press, and one side, deviating from the lime reaction tank, of the plate-and-frame filter press is connected with an efficient sedimentation tank. The device is provided with the waste liquid concentration tank, the tubular membrane filtration equipment and the plate-and-frame pressure filtration equipment, most waste liquid treated by the device can be directly reused on a production line, and a small amount of generated concentrated liquid can be discharged after reaching the standard after being deeply treated by the device.

Description

Technical Field

[0001] This utility model relates to the field of hydrofluoric acid wastewater reuse and treatment technology, specifically a hydrofluoric acid wastewater reuse and treatment system using a tubular membrane. Background Technology

[0002] Hydrofluoric acid etching is a common glass processing technique that uses highly corrosive hydrofluoric acid to etch the glass surface, achieving precise and meticulous etching. This technology has wide applications in glass micromachining, display manufacturing, and optical instrument manufacturing. It utilizes the chemical reaction between hydrofluoric acid and the glass surface to form compounds such as silicon fluoride, thereby dissolving the glass surface. The hydrofluoric acid used in these industrial processes reacts with other substances to produce waste liquid containing hydrofluoric acid. This waste liquid is characterized by its strong corrosiveness and toxicity, posing a threat to the environment and human health. Furthermore, the treatment of this waste liquid is difficult because hydrofluoric acid and water have similar polarities, making effective separation difficult using ordinary physical or chemical methods. Therefore, a hydrofluoric acid waste liquid recycling and treatment system using tubular membranes is needed to solve the aforementioned problems. This device is equipped with a waste liquid concentration tank, tubular membrane filtration equipment, and plate and frame filter press equipment. After treatment by this device, most of the waste liquid can be directly reused on the production line, and the small amount of concentrated liquid produced can also meet discharge standards after further treatment by this device. Utility Model Content

[0003] The purpose of this invention is to provide a hydrofluoric acid waste liquid recycling and treatment system using a tubular membrane to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a hydrofluoric acid waste liquid recycling and treatment system using a tubular membrane, comprising a liquid waste concentration tank, a tubular membrane, and a hydrofluoric acid recovery tank, wherein the tubular membrane is connected and disposed on one side of the liquid waste concentration tank, and the hydrofluoric acid recovery tank is connected and disposed on the side of the tubular membrane opposite to the liquid waste concentration tank.

[0005] Preferably, the bottom of the liquid waste concentration tank is cone-shaped.

[0006] Preferably, a lime reaction tank is connected to the bottom of the liquid waste concentration tank, a plate and frame filter press is connected to one side of the lime reaction tank, and a high-efficiency sedimentation tank is connected to the side of the plate and frame filter press away from the lime reaction tank.

[0007] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0008] I. The waste liquid concentration tank, lime reaction tank, and high-efficiency sedimentation tank of this utility model all adopt a conical bottom structure, which can quickly and thoroughly empty the tank, effectively avoiding cross-contamination between different batches of waste liquid, and also improving the treatment efficiency of the device. The waste liquid is filtered by tubular membrane, and the high-precision filter pore size can completely intercept impurities in hydrofluoric acid waste liquid without causing changes in the concentration of hydrofluoric acid. At the same time, no other reagents need to be added during this process, and no other substances are introduced, which can effectively ensure the purity and concentration of hydrofluoric acid.

[0009] Second, this utility model can flexibly adjust the amount of waste liquid reused and treated. When the amount of reused is small or even not needed, the lime dosing reaction tank and high-efficiency sedimentation tank process can also treat the waste liquid. Through high-efficiency filtration, the waste liquid can be recycled, which greatly reduces the company's reagent procurement and waste liquid disposal costs. It produces fluoride-containing sludge and a small amount of wastewater that can meet the discharge standards, thus achieving the reduction and harmlessness of pollutants.

[0010] Third, this device is equipped with a waste liquid concentration tank, tubular membrane filtration equipment and plate and frame filter press equipment. After being treated by this device, most of the waste liquid can be directly reused in the production line, and the small amount of concentrated liquid generated can also meet the discharge standards after being deeply treated by this device. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structural process of this utility model.

[0012] In the diagram: 1-Liquid waste concentration tank, 2-Tube membrane, 3-Hydrofluoric acid recovery tank, 4-Lime reaction tank, 5-Plate and frame filter press, 6-High-efficiency sedimentation tank. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figure 1This utility model provides an embodiment of a hydrofluoric acid waste liquid recycling and treatment system using a tubular membrane, comprising a waste liquid concentration tank 1, a tubular membrane 2, and a hydrofluoric acid recovery tank 3. The tubular membrane 2 is connected to one side of the waste liquid concentration tank 1, and the hydrofluoric acid recovery tank 3 is connected to the side of the tubular membrane 2 away from the waste liquid concentration tank 1. The hydrofluoric acid waste liquid first enters the waste liquid concentration tank 1, and then enters the tubular membrane 2 for solid-liquid separation and filtration. Impurities in the waste liquid can be completely intercepted to form a concentrated liquid, which is then returned to the waste liquid concentration tank 1. This process is repeated until a certain concentration is reached, at which point the waste liquid is discharged from the bottom. The filtrate is then returned to the hydrofluoric acid recovery tank 3 for reuse in the production line.

[0015] The bottom of the liquid waste concentration tank 1 is cone-shaped, which can quickly and thoroughly discharge the concentrated liquid and prevent cross-contamination of hydrofluoric acid waste liquid of different batches and concentrations.

[0016] A lime reaction tank 4 is connected to the bottom of the liquid waste concentration tank 1. A plate and frame filter press 5 is connected to one side of the lime reaction tank 4. A high-efficiency sedimentation tank 6 is connected to the side of the plate and frame filter press 5 away from the lime reaction tank 4.

[0017] Working principle: Hydrofluoric acid waste liquid first enters the liquid waste concentration tank 1, and then enters the tubular membrane 2 for solid-liquid separation and filtration. Impurities in the waste liquid can be completely intercepted to form concentrated liquid, which is then returned to the liquid waste concentration tank 1. This process is repeated until a certain concentration is reached, at which point it is discharged from the bottom. The waste liquid concentration tank 1 has a conical bottom, which can quickly and thoroughly discharge the concentrated liquid and prevent cross-contamination between different batches and concentrations of hydrofluoric acid waste liquid. The filtrate is then returned to the production line in the hydrofluoric acid recovery tank 3.

[0018] The concentrated liquid in waste liquid thickening tank 1 is discharged to lime reaction tank 4, where lime is added for reaction. The reaction tank is equipped with a pH meter and a stirrer. The pH is used to control the amount of lime added, and the stirring accelerates the mixing of lime and waste liquid. In lime reaction tank 4, lime reacts with fluoride ions in the concentrated liquid to form calcium fluoride precipitate. The solid-liquid mixture is then fed into plate and frame filter press 5 for filtration. The filtrate is discharged to high-efficiency sedimentation tank 6. In high-efficiency sedimentation tank 6, defluorinating agents and other chemicals are added to the filtrate of plate and frame filter press 5. The supernatant is discharged after meeting the standards. The sludge settled at the bottom of high-efficiency sedimentation tank 6 is then fed into plate and frame filter press 5 for filtration.

[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A system for hydrogen fluoride waste liquid recycling and treatment using tubular membrane, comprising a liquid waste concentration tank (1), a tubular membrane (2) and a hydrogen fluoride recovery tank (3), characterized in that: The tubular membrane (2) is connected to one side of the liquid waste concentration tank (1), the hydrogen fluoride recovery tank (3) is connected to the side of the tubular membrane (2) away from the liquid waste concentration tank (1); the bottom end of the liquid waste concentration tank (1) is in a conical shape; the bottom end of the liquid waste concentration tank (1) is connected to the lime reaction tank (4), one side of the lime reaction tank (4) is connected to the plate-and-frame filter press (5), and the side of the plate-and-frame filter press (5) away from the lime reaction tank (4) is connected to the high-efficiency sedimentation tank (6).

2. A system for recycling and treating hydrofluoric acid waste solution using a tubular membrane according to claim 1, characterized in that: The lime reaction tank (4) is provided with a pH meter and a stirrer.

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