Sodium hydrosulfite mother liquor purification treatment device

Abstract

The utility model discloses a sodium hydrosulfite mother liquor purification treatment device, including purification thick liquid jar and parallel filter on it, there is annular filter screen and filter screen cleaning structure in filter, and filter slag discharge pipe is connected purification thick liquid jar and sets up the automatic slag discharge program of time or pressure difference trigger, three groups of parallel filter handle the intermediate liquid of sodium hydrosulfite production different stage respectively, and the top of purification thick liquid jar is equipped with stirrer, and the input pipe and 3 level qualified mother liquor delivery pipe are also connected on the jar. Through filter screen real -time cleaning and automatic slag discharge avoid filter screen block, need not to disassemble equipment to clear slag, guarantee production continuity, three groups of filter adapt multistage liquid processing, stirrer prevents impurity deposition, adapts mother liquor reuse high -efficient link, improves mother liquor purification precision simultaneously, helps sodium hydrosulfite product upgrading, and is applicable to sodium hydrosulfite production mother liquor purification scene.

Description

Technical Field

[0001] This utility model relates to the technical field of mother liquor purification devices, and in particular to a purification and treatment device for sodium hydrosulfite mother liquor. Background Technology

[0002] In the production of sodium hydrosulfite, traditional filtration equipment commonly includes plate and frame filter presses and ordinary centrifugal filters. When processing mother liquor, these filters are prone to adsorbing fine salt particles and other impurities remaining in the mother liquor onto the filter cloth surface, causing rapid clogging of the filter cloth pores. Furthermore, cleaning requires disassembling the equipment and replacing the filter cloth, disrupting the production rhythm and affecting continuous operation, making it difficult to meet the high-efficiency connection requirements for mother liquor reuse. At the same time, traditional filter media have limited retention accuracy, and fine impurities can easily penetrate the filter cloth and enter the next round of reaction system with the mother liquor. This not only reduces the main reaction rate and increases the amount of by-products generated, but also becomes a key bottleneck restricting the product from achieving high purity levels and expanding high-end applications. Summary of the Invention

[0003] The technical problem this invention aims to solve is that the filter cloth in existing filtration equipment is prone to clogging, which affects the continuity of production.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a purification treatment device for sodium hydrosulfite mother liquor, including a purification concentrate tank and a filter connected in parallel to the purification concentrate tank. The filter is equipped with a filter screen and a filter screen cleaning structure. The slag discharge pipe of the filter is connected to the purification concentrate tank. The filters connected in parallel to the purification concentrate tank are respectively connected to intermediate liquids of sodium hydrosulfite at different production stages. The slag discharge pipe is equipped with an automatic slag discharge program.

[0005] Preferably, the purified concentrate tank is connected to three sets of filters, and the intermediate liquids input into the three sets of filters are respectively the mother liquor containing unprecipitated salt impurities, the neutralization liquid containing a small amount of solid residue, and the extracted methanol containing viscous flocculent matter.

[0006] Preferably, a stirrer is installed at the top of the purified concentrate tank, the stirrer is arranged vertically, and the stirrer is distributed between each adjacent group of filters.

[0007] Preferably, the filter includes a sealed tank, an inlet pipe connected to the top of the tank, an outlet pipe connected to the bottom of the tank, an annular filter screen coaxially fixed to the bottom of the tank, and a filter screen cleaning structure arranged in the tank. The inner side of the filter screen is connected to the inlet pipe, and the outer side of the filter screen is connected to the outlet pipe.

[0008] Preferably, the top and bottom of the filter screen are coaxially fixedly connected to annular mounting ring plates, and the outer side wall of the mounting ring plates is fixedly connected to the inner side wall of the tank.

[0009] Preferably, the filter cleaning structure includes a scraper motor installed on the top of the tank, a connecting shaft coaxially rotatably connected to the tank, and a scraper fixedly connected to the connecting shaft. The top end of the connecting shaft is coaxially fixedly connected to the output end of the scraper motor. The scraper is arranged parallel to the connecting shaft, and a gap is provided between the scraper and the inner sidewall of the filter.

[0010] Preferably, the automatic slag discharge program of the slag discharge pipe is timed slag discharge.

[0011] Preferably, the automatic slag discharge program of the slag discharge pipe is automatically triggered when the pressure difference is greater than 150 kPa, as monitored in real time by the pressure sensors at the inlet and outlet of the filter.

[0012] Preferably, the purified concentrate tank is connected to an input pipe, which is connected to a Class 3 qualified mother liquor delivery pipe.

[0013] This utility model provides a device for purifying and treating sodium hydrosulfite mother liquor, which has the following beneficial effects.

[0014] 1. Through the dual design of the filter screen cleaning structure and the automatic slag discharge program, the bottleneck of easy clogging of filter cloth in traditional filtration equipment is completely broken. The filter screen cleaning structure inside the filter can scrape and clean the inner wall of the filter screen in real time, preventing impurities such as fine salt particles and sticky flocculents from adsorbing and clogging the filter screen pores; at the same time, the slag discharge pipe is equipped with an automatic program for timed slag discharge or pressure differential triggered slag discharge. The cleaned impurities can be discharged back to the purification concentrate tank through the slag discharge pipe without disassembling the equipment, eliminating the step of replacing filter cloth in traditional equipment, avoiding disruption of the production rhythm, effectively adapting to the high-efficiency connection requirements of sodium hydrosulfite mother liquor recycling, and ensuring continuous and stable production.

[0015] 2. Three sets of filters are connected in parallel on the purified concentrate tank, which can separately treat the intermediate liquids at different stages of sodium hydrosulfite production. This eliminates the need for separate filtration equipment for the mother liquor at different stages, significantly improving the equipment's versatility. Simultaneously, the agitator installed on top of the purified concentrate tank can mix the impurities discharged back into the tank with the mother liquor, preventing impurity sedimentation. This facilitates subsequent centralized processing and ensures the uniformity of the mother liquor before reuse, further enhancing the practicality of the device throughout the entire sodium hydrosulfite production process. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0017] Figure 2 This is a schematic diagram of the internal structure of the filter in an embodiment of this utility model.

[0018] In the diagram: 1. Purified concentrate tank; 2. Agitator; 3. Filter; 31. Tank body; 32. Feed pipe; 33. Discharge pipe; 34. Scraper motor; 35. Filter screen; 36. Mounting ring plate; 37. Connecting shaft; 38. Scraper; 39. Slag discharge pipe. Detailed Implementation

[0019] like Figure 1 and Figure 2 As shown, this utility model provides a purification and treatment device for sodium hydrosulfite mother liquor, including a purification concentrate tank 1 and a filter 3 connected in parallel to the purification concentrate tank 1. The filter 3 is equipped with a filter screen 35 and a filter screen cleaning structure. The slag discharge pipe 39 of the filter 3 is connected to the purification concentrate tank 1. The filters 3 connected in parallel to the purification concentrate tank 1 are respectively connected to intermediate liquids of sodium hydrosulfite at different production stages. The slag discharge pipe 39 is equipped with an automatic slag discharge program.

[0020] Equipped with six purifiers 3, arranged in parallel on the concentrated purification tank 1, each purifier 3 is connected to the concentrated purification tank 1 via a slag discharge pipe 39 at its bottom, forming an integrated treatment unit with multi-filter synergistic filtration and centralized slag discharge from a single tank. This ensures that various liquids to be purified can be processed simultaneously or in batches. Precise purification removes solid impurities from the liquid, preventing impurities from being reused in the production process and affecting the purity of the sodium hydrosulfite product. It also prevents impurities from clogging subsequent pipelines and valves or adhering to the inner walls of the reaction equipment, reducing the frequency of production failures.

[0021] like Figure 1 As shown. The purified concentrate tank 1 is connected to three sets of filters 3. The intermediate liquids input into the three sets of filters 3 are, respectively, the mother liquor containing unprecipitated salt impurities, the neutralization liquid containing a small amount of solid residue, and the extracted methanol containing viscous flocculent matter.

[0022] In the three sets of filters 3, each set of filters 3 is equipped with two units, targeting three types of key liquids generated in the entire process of sodium hydrosulfite production: mother liquor containing unprecipitated salt impurities, neutralization liquid containing a small amount of solid residue, and methanol extraction containing viscous flocculent matter.

[0023] like Figure 1 As shown. A stirrer 2 is installed at the top of the purified concentrate tank 1. The stirrer 2 is vertically arranged and distributed between adjacent sets of filters 3. By arranging the stirrer 2 inside the purified concentrate tank 1, it is ensured that impurities entering the purified concentrate tank 1 can be uniformly mixed, facilitating the subsequent reuse of impurities.

[0024] like Figure 1 and Figure 2As shown. The filter 3 includes a sealed tank 31, an inlet pipe 32 connected to the top of the tank 31, an outlet pipe 33 connected to the bottom of the tank 31, an annular filter screen 35 coaxially fixedly arranged at the bottom of the tank 31, and a filter screen cleaning structure arranged inside the tank 31. The inner side of the filter screen 35 is connected to the inlet pipe 32, and the outer side of the filter screen 35 is connected to the outlet pipe 33.

[0025] A flow regulating valve is installed inside the feed pipe 32 to prevent excessively fast flow from impacting the filter screen 35 and causing impurities to penetrate, or excessively slow flow from reducing filtration efficiency. After the liquid enters the tank 1, under the action of filtration pressure, the liquid passes through the filter screen 35 and is discharged from the discharge pipe 33. Impurities blocked by the filter screen 35 adhere to the inner wall of the filter screen 35. The filter screen cleaning structure cleans the impurities attached to the filter screen 35, causing the impurities to fall to the bottom of the tank 1.

[0026] like Figure 2 As shown. The top and bottom of the filter screen 35 are coaxially fixedly connected to annular mounting ring plates 36, and the outer side wall of the mounting ring plates 36 is fixedly connected to the inner side wall of the tank body 31. The mounting ring plates 36 are not only used for the fixed installation of the filter screen 35, but also work with the filter screen 35 to separate the interior of the tank body 1, preventing unfiltered liquid from entering the discharge pipe 33.

[0027] like Figure 1 and Figure 2 As shown. The filter cleaning structure includes a scraper motor 34 installed on the top of the tank 31, a connecting shaft 37 coaxially rotatably connected inside the tank 31, and a scraper 38 fixedly connected to the connecting shaft 37. The top end of the connecting shaft 37 is coaxially fixedly connected to the output end of the scraper motor 34. The scraper 38 is arranged parallel to the connecting shaft 37, and a gap is provided between the scraper 38 and the inner wall of the filter screen 35. After the solid impurities trapped by the filter screen 35 form a filter cake layer with a thickness of 3-5mm, the connecting shaft 37 is driven to rotate by the scraper motor 34. The connecting shaft 37 drives the scraper 38 to rotate. The scraper 38 rotates continuously, and its cutting edge maintains a certain gap with the inner wall of the filter screen 34. This not only thoroughly removes the filter cake impurities deposited on the filter screen 35, but also avoids hard contact that could scratch the filter screen 35, ensuring that the filter screen 35 always maintains a high permeation efficiency.

[0028] As a preferred embodiment of this utility model, an automatic slag discharge method involves timed slag discharge, which is flexibly set according to the production load to adapt to working conditions with stable impurity content.

[0029] As a preferred embodiment of this utility model, another automatic slag discharge method is as follows: the automatic slag discharge program of the slag discharge pipe 39 is monitored in real time by the inlet and outlet pressure sensors of the filter 3, and is automatically triggered when the pressure difference is greater than 150kPa, which is suitable for working conditions with large fluctuations in impurity content.

[0030] Two automatic slag discharge modes can be flexibly switched. After being triggered, the drain valve on the bottom slag discharge pipe 39 of the filter 3 will be opened automatically to discharge the impurities in the slag collection area into the purification concentrate tank below. In order to ensure thorough slag discharge and not affect normal filtration, the drain valve is precisely controlled to open for 1 minute each time. After the time is up, it will automatically close. After closing, it will also perform a self-check on the valve sealing status to prevent liquid leakage and impurity backflow.

[0031] As a preferred embodiment of this utility model, the purified concentrate tank 1 is connected to an input pipe, which is connected to a three-stage qualified mother liquor delivery pipe. The impurities collected in the purified concentrate tank 1 are first mixed with the three-stage qualified mother liquor at a certain liquid-solid ratio. After being mixed evenly, the mixture is pumped from the bottom of the tank into a non-qualified mother liquor tank for temporary storage. Through a neutralization reaction, the impurities are converted into sodium sulfite, thus realizing the reuse of the impurities.

Claims

1. A device for purifying and treating sodium hydrosulfite mother liquor, characterized in that: It includes a purification concentrate tank (1) and a filter (3) connected in parallel to the purification concentrate tank (1). The filter (3) is equipped with a filter screen (35) and a filter screen cleaning structure. The slag discharge pipe (39) of the filter (3) is connected to the purification concentrate tank (1). The filter (3) connected in parallel to the purification concentrate tank (1) is connected to intermediate liquids of different production stages of sodium hydrosulfite. The slag discharge pipe (39) is equipped with an automatic slag discharge program.

2. The sodium hydrosulfite mother liquor purification and treatment device as described in claim 1, characterized in that: The purified concentrate tank (1) is connected to three sets of filters (3). The intermediate liquids input into the three sets of filters (3) are the mother liquor containing unprecipitated salt impurities, the neutralization liquid containing a small amount of solid residue, and the extracted methanol containing viscous flocculent matter.

3. The sodium hydrosulfite mother liquor purification and treatment device as described in claim 2, characterized in that: A stirrer (2) is installed on the top of the purified concentrate tank (1). The stirrer (2) is arranged vertically and distributed between each adjacent set of filters (3).

4. The sodium hydrosulfite mother liquor purification and treatment device as described in claim 1, characterized in that: The filter (3) includes a sealed tank (31), an inlet pipe (32) connected to the top of the tank (31), an outlet pipe (33) connected to the bottom of the tank (31), an annular filter screen (35) coaxially fixedly arranged at the bottom of the tank (31), and a filter screen cleaning structure arranged in the tank (31). The inner side of the filter screen (35) is connected to the inlet pipe (32), and the outer side of the filter screen (35) is connected to the outlet pipe (33).

5. The sodium hydrosulfite mother liquor purification and treatment device as described in claim 4, characterized in that: The top and bottom of the filter screen (35) are coaxially fixedly connected to annular mounting ring plates (36), and the outer side wall of the mounting ring plates (36) is fixedly connected to the inner side wall of the tank body (31).

6. The sodium hydrosulfite mother liquor purification and treatment device as described in claim 4, characterized in that: The filter cleaning structure includes a scraper motor (34) installed on the top of the tank (31), a connecting shaft (37) coaxially rotatably connected inside the tank (31), and a scraper (38) fixedly connected to the connecting shaft (37). The top end of the connecting shaft (37) is coaxially fixedly connected to the output end of the scraper motor (34). The scraper (38) is arranged parallel to the connecting shaft (37), and a gap is provided between the scraper (38) and the inner wall of the filter (35).

7. The sodium hydrosulfite mother liquor purification and treatment device as described in claim 1, characterized in that: The automatic slag discharge program of the slag discharge pipe (39) is timed slag discharge.

8. The sodium hydrosulfite mother liquor purification and treatment device as described in claim 1, characterized in that: The automatic slag discharge program of the slag discharge pipe (39) is automatically triggered when the pressure difference is greater than 150 kPa, as it is monitored in real time by the pressure sensors at the inlet and outlet of the filter (3).

9. The sodium hydrosulfite mother liquor purification and treatment device as described in claim 1, characterized in that: The purified concentrate tank (1) is connected to an input pipe, which is connected to a 3-level qualified mother liquor delivery pipe.

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