Multistage purification device

Abstract

The utility model provides a kind of multistage purification device, it is related to solid waste resource recycling technical field.The multistage purification device includes liquid tank, and sequentially intercommunicating first purification unit, second purification unit and third purification unit, and the pipeline of first purification unit is equipped with filter, and the pipeline of second purification unit is equipped with static tank, and the pipeline of third purification unit is equipped with buffer tank;The pipeline of first purification unit is communicated with liquid tank;The pipeline of third purification unit is used for communicating with external equipment;Wherein, the upper portion of the static tank of second purification unit is equipped with liquid outlet, and liquid outlet is used to introduce the upper liquid in static tank into static tank.The utility model is through multistage purification unit and static tank upper portion liquid outlet design, solved waste liquid purification clear liquid and containing residue liquid mixed disturbance problem;Ensure that the purity and flow stability of liquid entering external equipment, to improve the separation effect and resource utilization of recyclable material.

Description

Technical Field

[0001] This utility model belongs to the field of solid waste resource recycling technology, and in particular relates to a multi-stage purification device. Background Technology

[0002] Industrial production processes such as coking, chemical, and metallurgical processes generate large amounts of industrial waste liquid containing recyclable substances such as salts and precious metal ions. Direct discharge of this waste liquid not only wastes valuable resources but also causes serious pollution to the soil, water bodies, and other ecological environments. Therefore, it is urgent to use efficient purification devices to separate, purify, and utilize recyclable substances.

[0003] In existing wastewater purification devices, after the wastewater settles, the resulting upper clear liquid and lower sludge-containing liquid are prone to mixing and disturbance during the flow process, causing the separated impurities to re-enter the clear liquid. This not only reduces the purity of the recovered materials but may also cause blockages or damage to subsequent external processing equipment (such as incinerators and crystallizers). Utility Model Content

[0004] In view of this, the present invention provides a multi-stage purification device, which aims to address the problem that existing waste liquid purification devices are prone to mixing and disturbance during the flow of clear liquid and sludge-containing liquid, resulting in the secondary mixing of separated impurities into the clear liquid and insufficient purity of recovered substances.

[0005] The technical solution of this utility model is implemented as follows: This utility model provides a multi-stage purification device, including a liquid tank and a multi-stage purification unit. The liquid tank is used to contain recyclable substances and water. The multi-stage purification unit includes at least a first purification unit, a second purification unit, and a third purification unit connected in sequence. A filter is installed on the pipeline of the first purification unit, a settling tank is installed on the pipeline of the second purification unit, and a buffer tank is installed on the pipeline of the third purification unit. The pipeline of the first purification unit is connected to the liquid tank to introduce the liquid in the liquid tank into the filter. The pipeline of the third purification unit is used to connect to external equipment to supply the external equipment with the liquid purified by the multi-stage purification unit. The settling tank of the second purification unit has an outlet at the top to introduce the upper layer of liquid in the settling tank into the settling tank.

[0006] In one embodiment, the outlet of the settling tank is positioned higher than the top of the buffer tank, so that the upper layer of liquid in the settling tank flows into the buffer tank by gravity.

[0007] In one embodiment, the pipeline of the first purification unit is further provided with a finished product tank, which is used to introduce the liquid in the filter and output it to the second purification unit.

[0008] In one embodiment, a first reflux pipe is also included. The bottom end of the settling tank has a reflux port. The first reflux pipe connects the reflux port and the liquid tank to guide the lower layer liquid in the settling tank back into the liquid tank.

[0009] In one embodiment, a filter screen is further included, which is vertically arranged and divides the internal space of the liquid tank into a salt dissolving tank and a filtration tank; the pipeline of the first purification unit is connected to the filtration tank to introduce the liquid in the filtration tank into the filter; the return port of the settling tank is connected to the filtration tank to introduce the lower layer liquid in the settling tank into the filtration tank.

[0010] In one embodiment, the first purification unit includes a first delivery pipeline connecting the filter tank and the filter; the multi-stage purification device further includes a second return pipe connecting the first delivery pipeline and the salt dissolving tank to guide the liquid on the first delivery pipeline back into the salt dissolving tank.

[0011] In one embodiment, a first delivery pump is provided on the first delivery pipeline; wherein, the first end of the second return pipe is connected to the filter tank, and the second end of the second return pipe is connected to the portion of the first delivery pipeline located between the filter tank and the filter.

[0012] In one embodiment, a swirl sprayer is provided at the first end of the second return pipe. The interior of the swirl sprayer is connected to the second return pipe and extends into the salt dissolving tank to agitate the liquid in the salt dissolving tank.

[0013] In one embodiment, the swirl sprayer includes a connecting portion and a plurality of nozzles circumferentially disposed on the connecting portion, the interior of each nozzle communicating with the interior of the connecting portion, and the connecting portion communicating with the second return pipe; the spray direction of each nozzle is radially and inclined downward along the connecting portion.

[0014] In one embodiment, the system further includes a heater that extends into the liquid tank to heat the liquid in the tank; and / or, the external equipment includes a salt incinerator, and the pipeline of the third purification unit is connected to the feed inlet of the salt incinerator.

[0015] This utility model embodiment solves the problem of easy mixing and disturbance between clear liquid and sludge-containing liquid during the flow of existing waste liquid purification devices by setting up a multi-stage purification unit and opening a liquid outlet at the top of the settling tank. The filter of the first purification unit can initially remove large particulate impurities, laying the foundation for subsequent settling; the settling tank of the second purification unit uses gravity to achieve impurity settling, and the liquid outlet at the top can discharge the upper clear liquid, avoiding the lower sludge being stirred; the buffer tank of the third purification unit further stabilizes the liquid state, ensuring the purity and flow stability of the liquid entering the external equipment, thereby improving the separation effect and resource utilization rate of recyclable materials, while reducing the risk of damage to subsequent equipment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the multi-stage purification device provided by this utility model; Figure 2 A schematic diagram of the structure of the swirl spray component of the multi-stage purification device provided by this utility model.

[0018] Explanation of reference numerals in the attached figures: 100. Purification device; 1. Liquid tank; 11. Salt dissolving tank; 12. Filter tank; 2. First purification unit; 21. Filter; 22. Finished product tank; 23. First conveying pipeline; 24. First conveying pump; 3. Second purification unit; 31. Settling tank; 311. Liquid outlet; 312. Return outlet; 4. Third purification unit; 41. Buffer tank; 5. First return pipe; 6. Filter screen; 7. Second return pipe; 8. Spray nozzle; 81. Connecting part; 82. Nozzle; 9. Heater; 200. External equipment. Detailed Implementation

[0019] 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 scope of protection of the present utility model.

[0020] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0022] Industrial production processes such as coking, chemical, and metallurgical processes generate large amounts of industrial waste liquid containing recyclable substances such as salts and precious metal ions. Direct discharge of such waste liquid not only wastes valuable resources but also causes serious pollution to the ecological environment, including soil and water bodies. Therefore, it is urgent to use high-efficiency purification devices to separate, purify, and utilize recyclable substances.

[0023] In existing waste liquid purification devices 100, after the waste liquid settles, the resulting upper clear liquid and lower slag-containing liquid are prone to mixing and disturbance during the flow process, causing the separated impurities to re-enter the clear liquid. This not only reduces the purity of the recovered materials but may also cause blockages or damage to subsequent external processing equipment (such as incinerators and crystallizers).

[0024] In view of this, the present invention provides a multi-stage purification device 100, which aims to address the problem that existing waste liquid purification devices 100 are prone to mixing and disturbance during the flow of clear liquid and sludge-containing liquid, resulting in the secondary mixing of separated impurities into the clear liquid and insufficient purity of recovered substances.

[0025] This multi-stage purification device 100 can be used to treat industrial waste liquid containing recyclable substances such as salts and precious metal ions, such as waste salt.

[0026] The multi-stage purification device 100 includes a liquid tank 1 and a multi-stage purification unit. The liquid tank 1 is used to hold recyclable substances (such as industrial waste salt) and water (such as condensate from recycled plant steam). The liquid tank 1 is designed to be open, which allows operators to easily add substances to be treated or to observe liquid levels and perform manual cleaning.

[0027] The multi-stage purification unit includes at least a first purification unit 2, a second purification unit 3, and a third purification unit 4 connected in sequence. This hierarchical arrangement enables progressive and in-depth purification of the liquid, ensuring that each purification unit specifically removes specific types of impurities, thereby improving the overall purification effect. The first purification unit 2 is equipped with a filter 21, which can be a bag filter or a precision filter. The filter 21 contains filter media of different pore sizes, capable of intercepting larger suspended impurities and solid residues in the liquid. The pre-purified liquid then enters the subsequent processing unit. The second purification unit 3 is equipped with a settling tank 31. The volume of the settling tank 31 is designed according to the processing capacity. The liquid remains in the settling tank 31 for a certain period, allowing the denser, smaller particles to settle further due to gravity. Simultaneously, adding an appropriate amount of flocculant to the settling tank 31 promotes the aggregation of smaller particles into larger flocs, accelerating the settling process and improving solid-liquid separation efficiency. The pipeline of the third purification unit 4 is equipped with a buffer tank 41. The buffer tank 41 can stabilize the pressure and balance the flow rate, so as to prevent the liquid after multi-stage purification from directly entering the external equipment 200 and affecting the normal operation of the external equipment 200 due to flow or pressure fluctuations. It also provides a buffer space for subsequent testing or further processing.

[0028] More importantly, the settling tank 31 of the second purification unit 3 has a liquid outlet 311 at its upper part. This liquid outlet 311 is used to introduce the upper layer liquid in the settling tank 31 into the buffer tank 41 of the third purification unit 4. By placing the liquid outlet 311 at the top, disturbance to the lower layer of sludge-containing liquid can be effectively avoided during liquid flow, minimizing the secondary mixing of settled impurities, thereby significantly improving the purity of the purified liquid.

[0029] The purification principle of the multi-stage purification device 100 is as follows: the recyclable material in the liquid tank 1 is mixed with water to form a liquid to be treated, which is introduced into the filter 21 through the pipeline of the first purification unit 2. After the large particulate impurities are removed by the preliminary filtration, it enters the settling tank 31 of the second purification unit 3. In the settling tank 31, the liquid settles by gravity, and the impurities with higher density gradually sink to the bottom of the tank. The clear liquid on the upper layer flows into the buffer tank 41 of the third purification unit 4 through the liquid outlet 311 at the top of the settling tank 31. After the buffer tank 41 stabilizes and buffers the clear liquid, it is then transported to the external equipment 200 through its pipeline to realize the resource utilization of the purified liquid.

[0030] Furthermore, this multi-stage purification device 100 can process continuously and in large quantities because: its liquid tank 1 and the multi-stage purification units form a continuous liquid transport path through pipelines; the filter 21 of the first purification unit 2 can efficiently intercept large particulate impurities, preventing blockage of subsequent pipelines and ensuring smooth liquid flow; the settling tank 31 of the second purification unit 3, through reasonable design of volume and residence time, can achieve stable solid-liquid separation while continuously feeding liquid, and the upper clear liquid continuously flows into the third purification unit 4 through the upper outlet 311; the buffer tank 41 of the third purification unit 4 can balance flow fluctuations and ensure continuous liquid supply to external equipment 200. In addition, the pipeline layout of each purification unit is compact and independent, reducing the risk of liquid stagnation and mixing during the flow process, enabling the entire treatment process to operate uninterruptedly and meeting the large-scale demand for waste liquid treatment in industrial production.

[0031] In summary, the multi-stage purification device 100 provided in this embodiment of the present invention includes a liquid tank 1 and a multi-stage purification unit. The interior of the liquid tank 1 is used to contain recyclable substances and water. The multi-stage purification unit includes at least a first purification unit 2, a second purification unit 3, and a third purification unit 4 connected in sequence. A filter 21 is provided on the pipeline of the first purification unit 2, a settling tank 31 is provided on the pipeline of the second purification unit 3, and a buffer tank 41 is provided on the pipeline of the third purification unit 4. The pipeline of the first purification unit 2 is connected to the liquid tank 1 to introduce the liquid in the liquid tank 1 into the filter 21. The pipeline of the third purification unit 4 is used to connect to an external device 200 to supply the external device 200 with the liquid purified by the multi-stage purification unit. The settling tank 31 of the second purification unit 3 has an outlet 311 at its upper part, which is used to introduce the upper layer liquid in the settling tank 31 into the settling tank 31.

[0032] This embodiment of the invention solves the problem of easy mixing and disturbance between clear liquid and sludge-containing liquid during the flow of existing waste liquid purification devices 100 by setting up multi-stage purification units and opening a liquid outlet 311 at the top of the settling tank 31. The filter 21 of the first purification unit 2 can initially remove large particulate impurities, laying the foundation for subsequent settling; the settling tank 31 of the second purification unit 3 uses gravity to achieve impurity settling, and the upper liquid outlet 311 can discharge the upper clear liquid to avoid the lower sludge being stirred; the buffer tank 41 of the third purification unit 4 further stabilizes the liquid state, ensuring the purity and flow stability of the liquid entering the external equipment 200, thereby improving the separation effect and resource utilization of recyclable materials, while reducing the risk of damage to subsequent equipment.

[0033] In some embodiments, in order to achieve a smooth and reliable transfer of the upper liquid after settling to the subsequent unit, while reducing the interference of external factors on the purification effect, the outlet 311 of the settling tank 31 is positioned higher than the top of the buffer tank 41, so that the upper liquid in the settling tank 31 flows into the buffer tank 41 by gravity.

[0034] This gravity-fed design eliminates the need for additional power delivery equipment, simplifying the overall structure, reducing equipment costs and energy consumption, and preventing vibrations from pumps and other power components from interfering with the settling process of the liquid in the settling tank 31, thus ensuring the purity of the upper clear liquid. By appropriately setting the height difference between the two tanks, the flow rate of the liquid can be controlled, ensuring sufficient settling time for the liquid in the settling tank 31, while also preventing excessively fast flow rates from causing severe disturbances in the buffer tank 41, which could affect the subsequent pressure stabilization and buffering effect.

[0035] In some embodiments, a finished product tank 22 is added to stabilize the liquid inside the pipeline at the junction of the first purification unit 2 and the second purification unit 3. Specifically, the finished product tank 22 is located on the pipeline of the first purification unit 2 to introduce the liquid in the filter 21 and output it to the second purification unit 3.

[0036] The finished product tank 22 provides temporary storage for the liquid initially filtered by the filter 21, acting as a buffer to prevent unstable flow from the filter 21's effluent from directly entering the settling tank 31 and affecting the settling effect. Furthermore, the finished product tank 22 is equipped with a level sensor, which controls the start / stop of the filter 21 or adjusts the inlet flow rate via the level signal, enabling automated continuous operation. Simultaneously, the finished product tank 22 provides operators with a window to observe the state of the filtered liquid, facilitating timely detection of blockages in the filter 21 or the need for filter media replacement, ensuring the stable operation of the first purification unit 2.

[0037] In some embodiments, to prevent the long-term accumulation of sludge-containing liquid generated by the settling of waste liquid in the liquid tank 1, and to fully recover the residual recyclable substances therein, a first return pipe 5 is also provided. Specifically, a return port 312 is provided at the bottom of the settling tank 31, and the first return pipe 5 is connected between the return port 312 and the liquid tank 1 to guide the lower layer liquid in the settling tank 31 back into the liquid tank 1.

[0038] After settling in the settling tank 31, the lower layer of liquid containing slag enters the first return pipe 5 through the return port 312. After returning to the liquid tank 1, it mixes with newly added substances to be treated, achieving the recycling of the liquid containing slag. This prevents impurities from accumulating at the bottom of the settling tank 31 for a long time, which would make cleaning difficult, and also improves the overall recovery rate of recyclable materials. Furthermore, a valve is installed on the first return pipe 5. The opening degree of this valve regulates the return flow rate, controlling the return speed according to the amount of slag in the settling tank 31, so that the liquid concentration and impurity content in the liquid tank 1 are within a reasonable range, maintaining the stable operation of the entire purification system.

[0039] In some embodiments, in order to achieve preliminary pretreatment of the liquid to be treated and optimize the liquid flow path to improve the overall purification efficiency, a filter screen 6 is added. The filter screen 6 divides the internal space of the liquid tank 1 into a salt dissolving tank 11 and a filter tank 12, and the liquid flows in one direction only through the filter screen 6. The pipeline of the first purification unit 2 is connected to the filter tank 12 to introduce the liquid after preliminary filtration in the filter tank 12 into the filter machine 21 for deep purification.

[0040] The vertical arrangement of the filter screen 6 allows for convenient connection of the salt dissolving tank 11 and the filter tank 12 to other pipelines. Specifically, the vertically separated structure ensures that the walls of both the salt dissolving tank 11 and the filter tank 12 maintain a complete vertical layout. Interfaces can be flexibly opened at different heights of the two tanks according to pipeline connection requirements. This facilitates the connection of the salt dissolving tank 11 to the pipeline for adding the substance to be treated, the return pipeline, etc., and the filter tank 12 to the delivery pipeline of the first purification unit 2, etc. There is no need to avoid the installation space of the filter screen 6, which simplifies the pipeline layout and installation operation.

[0041] Furthermore, the return port 312 of the settling tank 31 is connected to the filter tank 12 through the first return pipe 5, so as to introduce the lower layer of slag-containing liquid in the settling tank 31 into the filter tank 12.

[0042] Compared to directing the reflux liquid into the salt dissolving tank 11, this design avoids direct mixing of the sludge-containing liquid with the newly added substances to be treated, which would increase the overall impurity concentration and reduce the load on the salt dissolving and subsequent treatment stages. Simultaneously, after entering the filter tank 12, the reflux liquid undergoes preliminary sludge removal via the filter screen 6, pre-retaining some large particles of sediment. It then enters the filter 21 along with the pre-purified liquid in the filter tank 12 for further treatment, making the reflux liquid treatment more targeted. This directional reflux design not only ensures the initial purity of the liquid to be treated in the salt dissolving tank 11 but also optimizes the secondary treatment path of the reflux liquid, further improving the thoroughness of impurity separation and the recovery rate of recyclable substances, while maintaining the operational stability of the entire purification system.

[0043] In some embodiments, to prevent the substances to be treated from accumulating and forming sludge in the salt dissolving tank 11, and to ensure the liquid dissolution efficiency and the cleanliness of the salt dissolving tank 11, the pipeline of the first purification unit 2 includes a first conveying pipeline 23 connected between the filter tank 12 and the filter 21; the multi-stage purification device 100 also includes a second return pipe 7, which is connected between the first conveying pipeline 23 and the salt dissolving tank 11, so as to guide a portion of the liquid on the first conveying pipeline back into the salt dissolving tank 11.

[0044] After the returned liquid enters the salt dissolving tank 11 through the second return pipe 7, it forms a directional flow and local turbulence, which scours the bottom and walls of the tank, effectively breaking up the initially deposited particles and preventing them from agglomerating into difficult-to-clean sludge. Simultaneously, the flow disturbance promotes thorough mixing of the substances to be treated with water within the tank, accelerating the dissolution rate and preventing crystallization due to excessively high local concentrations. This design, utilizing the existing liquid within the system for self-cleaning and enhanced mixing, eliminates the need for additional stirring equipment, simplifying the structure and reducing energy consumption while effectively solving the problem of sludge accumulation in the salt dissolving tank 11.

[0045] In some embodiments, in order to enhance the turbulence effect of the reflux liquid by means of the power of the delivery pump, a first delivery pump 24 is provided on the first delivery pipeline 23; wherein, the first end of the second reflux pipe 7 is connected to the filter tank 12, and the second end of the second reflux pipe 7 is connected to the part of the first delivery pipeline 23 located between the filter tank 12 and the filter 21.

[0046] The first delivery pump 24 provides power for the liquid delivery of the first delivery pipeline 23. The second end of the second return pipe 7 is connected to the section between the filter tank 12 and the first delivery pump 24. The negative pressure from the pump's suction naturally guides some liquid to flow into the second return pipe 7, achieving stable return without the need for additional power equipment, simplifying the structure and reducing energy consumption. Simultaneously, after the return liquid is introduced into the filter tank 12 via the second return pipe 7, it mixes with the pre-purified liquid in the filter tank 12, creating localized flow disturbances. This helps prevent the deposition of residual impurities in the filter tank 12 and improves the uniformity of liquid supply from the filter tank 12 to the first delivery pump 24, ensuring the stable operation of the first delivery pump 24 and further optimizing the synergy of the entire delivery and return system.

[0047] In some embodiments, in order to enhance the disturbance effect of the liquid in the salt dissolving tank 11 and more effectively prevent the material to be treated from depositing and agglomerating, a swirl sprayer 8 is provided at the first end of the second return pipe 7. The interior of the swirl sprayer 8 is connected to the second return pipe 7 and extends into the salt dissolving tank 11 to disturb the liquid in the salt dissolving tank 11.

[0048] Powered by the first delivery pump 24, the rotary sprayer 8 transforms the reflux liquid in the second return pipe 7 into a high-pressure rotating jet, which is then sprayed into the salt dissolving tank 11, creating a strong local turbulence and stirring effect. Compared to the direct discharge from a regular return pipe, the rotating jet has a wider diffusion range and stronger impact force. It can effectively disperse undissolved particles in the salt dissolving tank 11, preventing them from accumulating at the bottom to form sludge or clumps, and also accelerate the mixing uniformity of the substances to be treated with water, improving dissolution efficiency. Simultaneously, the spray direction of the rotary sprayer 8 can be specifically designed (e.g., towards the filter screen 6, the bottom of the salt dissolving tank 11, and the tank walls) to create directional flushing of areas prone to sedimentation, further enhancing the anti-deposition effect. This structural design eliminates the need for additional stirring equipment; efficient turbulence can be achieved simply by optimizing the return outlet structure. This simplifies the device, reduces energy consumption, and ensures the uniformity and cleanliness of the liquid in the salt dissolving tank 11.

[0049] In some embodiments, in order to make the agitation range of the swirl sprayer 8 more comprehensive and the anti-deposition effect more thorough, the swirl sprayer 8 includes a connecting part 81 and a plurality of nozzles 82 circumferentially disposed on the connecting part 81. The interior of each nozzle 82 is in communication with the interior of the connecting part 81, and the connecting part 81 is in communication with the second return pipe 7. The spray direction of each nozzle 82 is arranged radially and inclined downward along the connecting part 81.

[0050] The connecting part 81 is used to fix the first end of the second return pipe 7 to ensure the stable introduction of the return liquid. Multiple nozzles 82 are evenly distributed around the connecting part 81, enabling 360° spraying without dead angles and covering the entire cross-section of the salt dissolving tank 11. The downward-sloping design of the nozzles 82 allows the high-pressure rotating jet to directly act on the bottom and easily deposited areas of the salt dissolving tank 11. It creates a large-scale turbulence through the radial spray diffusion force, promoting the mixing and dissolution of the substance to be treated with water. At the same time, the downward-sloping impact force directionally washes away residual particulate impurities at the bottom of the tank, effectively breaking up potential deposits and preventing sludge accumulation. This structural design maximizes the targeting and coverage of the vortex spray 8 without adding extra power, further enhancing the self-cleaning effect and dissolution efficiency of the salt dissolving tank 11.

[0051] In some embodiments, in order to accelerate the dissolution rate of the substance to be treated, improve the dissolution sufficiency, and reduce the risk of substance crystallization and deposition at low temperatures, a heater 9 is also provided. The heater 9 extends into the liquid tank 1 to heat the liquid in the liquid tank 1.

[0052] Heater 9 is in direct contact with the liquid in tank 1, allowing for temperature control to the optimal range for dissolving the substances to be treated. For example, if the liquid in tank 1 is waste brine, the heating temperature can be selected between 60 and 70°C. Increased temperature significantly accelerates the diffusion rate of molecules, promoting rapid fusion of recyclable materials with water and preventing particle residue and sedimentation due to insufficient dissolution. Especially under low-temperature conditions, the heated liquid effectively prevents crystallization and reduces the possibility of sludge formation at the bottom of the tank. Simultaneously, the heated liquid has increased fluidity, working synergistically with the swirling jet agitation of the second return pipe 7 to further improve mixing uniformity, providing a stable concentration of treated liquid for subsequent filtration, sedimentation, and other purification processes, ensuring the overall efficiency and stability of the purification system.

[0053] In some embodiments, the external device 200 includes a salt incinerator, and the pipeline of the third purification unit 4 is connected to the feed inlet of the salt incinerator to stably supply the salt incinerator with liquid containing recyclable salts purified by the multi-stage purification unit.

[0054] As the core equipment for industrial salt recovery, the salt incinerator has extremely high requirements for the purity and stability of the feed. Excessive impurities in the feed can easily lead to coking in the furnace and blockage of the heating surfaces, affecting combustion efficiency and equipment lifespan. Large fluctuations in the feed flow rate can cause unstable furnace temperature, affecting the melting and recovery quality of the salt. This device, through a multi-stage purification process of "deep impurity removal by filter 21 + sedimentation separation by settling tank 31 + pressure stabilization and homogenization by buffer tank 41," effectively removes large particulate impurities and fine suspended slag from the liquid while ensuring stable output flow. This perfectly matches the feed requirements of the salt incinerator, providing high-quality and stable raw materials for efficient salt incineration and recovery, further enhancing the overall efficiency of industrial waste liquid resource recovery.

[0055] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A multi-stage purification device, characterized in that, include: The liquid tank is used to hold recyclable materials and water. A multi-stage purification unit includes at least a first purification unit, a second purification unit, and a third purification unit connected in sequence. A filter is installed on the pipeline of the first purification unit, a settling tank is installed on the pipeline of the second purification unit, and a buffer tank is installed on the pipeline of the third purification unit. The pipeline of the first purification unit is connected to a liquid tank to introduce liquid from the liquid tank into the filter. The pipeline of the third purification unit is used to connect to external equipment to supply the external equipment with liquid purified by the multi-stage purification unit. The second purification unit has a liquid outlet at the top of the settling tank, which is used to introduce the upper liquid in the settling tank into the settling tank.

2. The multi-stage purification device according to claim 1, characterized in that, The outlet of the settling tank is positioned higher than the top of the buffer tank, so that the upper layer of liquid in the settling tank flows into the buffer tank by gravity.

3. The multi-stage purification device according to claim 1, characterized in that, The first purification unit is also equipped with a finished product tank on its pipeline. The finished product tank is used to introduce the liquid in the filter and output it to the second purification unit.

4. The multi-stage purification device according to any one of claims 1 to 3, characterized in that, It also includes a first reflux pipe, and the bottom end of the settling tank is provided with a reflux port. The first reflux pipe is connected between the reflux port and the liquid tank to guide the lower layer of liquid in the settling tank back into the liquid tank.

5. The multi-stage purification device according to claim 4, characterized in that, It also includes a filter screen, which is vertically arranged and divides the internal space of the liquid tank into a salt dissolving tank and a filtering tank; The pipeline of the first purification unit is connected to the filter tank to introduce the liquid in the filter tank into the filter; the return port of the settling tank is connected to the filter tank to introduce the lower layer liquid in the settling tank into the filter tank.

6. The multi-stage purification device according to claim 5, characterized in that, The first purification unit includes a first delivery pipeline connecting the filter tank and the filter. The multi-stage purification device also includes a second return pipe, which connects the first delivery pipeline and the salt dissolving tank to guide the liquid on the first delivery pipeline back into the salt dissolving tank.

7. The multi-stage purification device according to claim 6, characterized in that, A first delivery pump is installed on the first delivery pipeline; The first end of the second return pipe is connected to the filter tank, and the second end of the second return pipe is connected to the part of the first delivery pipeline located between the filter tank and the filter machine.

8. The multi-stage purification device according to claim 7, characterized in that, The first end of the second return pipe is provided with a swirl sprayer. The interior of the swirl sprayer is connected to the second return pipe and extends into the salt dissolving tank to agitate the liquid in the salt dissolving tank.

9. The multi-stage purification device according to claim 8, characterized in that, The swirl sprayer includes a connecting portion and a plurality of nozzles circumferentially disposed on the connecting portion. The interior of each nozzle communicates with the interior of the connecting portion, and the connecting portion communicates with the second return pipe. The spray direction of each nozzle is radially and inclined downward along the connecting portion.

10. The multi-stage purification device according to claim 1, characterized in that, It also includes a heater that extends into the liquid tank to heat the liquid in the tank; and / or, The external equipment includes a salt incinerator, and the pipeline of the third purification unit is connected to the feed inlet of the salt incinerator.

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