A coarse crystal coke sodium sulfite production device

Abstract

This invention provides a production apparatus for coarse-crystalline sodium metabisulfite, comprising a primary reactor, a secondary reactor, a tertiary reactor, and a sodium carbonate liquid tank connected in series. The primary reactor has a sulfur dioxide inlet on its side wall. A flow pump is installed on the connecting pipe between the secondary reactor and the primary reactor. A gas flow meter is installed at the sulfur dioxide inlet. A pH probe is installed inside the primary reactor. A crystallizer is connected to the bottom of the primary reactor via a conveying pipe equipped with a conveying pump. The crystallizer is installed higher than the primary reactor. An overflow pipe connected to the primary reactor is located at the top of the crystallizer, and a discharge pipe with a discharge valve is connected to the bottom of the crystallizer. The coarse-crystalline sodium metabisulfite production apparatus provided by this invention can increase the particle size of sodium metabisulfite, improve the main content of the product, enhance product quality, and extend the product's agglomeration cycle.

Description

Technical Field

[0001] This utility model relates to the field of chemical production equipment, specifically to a production apparatus for coarse-crystal sodium metabisulfite. Background Technology

[0002] Sodium metabisulfite is an important reducing agent. Industrially, sodium metabisulfite is generally produced by a wet process: SO2 and soda ash solution are reacted countercurrently in a three-stage series reactor to produce sodium bisulfite. Sodium bisulfite is dehydrated to precipitate sodium metabisulfite crystals, which are then centrifuged and dried to obtain the finished product.

[0003] Utility model patent CN203006961U discloses a device for producing sodium metabisulfite and anhydrous sodium sulfite, comprising a sodium metabisulfite production system and an anhydrous sodium sulfite production system simultaneously connected to a main sulfur dioxide gas pipeline. The sodium metabisulfite production system adopts a three-stage series countercurrent absorption structure, while the anhydrous sodium sulfite production system adopts a two-stage spray absorption structure. This utility model utilizes sulfur dioxide gas generated from the roasting of sulfide ore to produce sodium metabisulfite and anhydrous sodium sulfite, reducing the manufacturing cost of sodium metabisulfite and anhydrous sodium sulfite, improving the utilization rate of pyrite resources, and featuring a reasonable structure that is energy-saving and environmentally friendly.

[0004] However, the sodium metabisulfite prepared by the above-mentioned invention has a small particle size, resulting in a short product agglomeration cycle and affecting product quality. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, this utility model provides a coarse-grained sodium pyrosulfite production device, which can increase the particle size of sodium pyrosulfite, improve the main content of the product, enhance product quality, and extend the product agglomeration cycle.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A crude crystalline sodium metabisulfite production apparatus includes a primary reactor, a secondary reactor, a tertiary reactor, and a sodium carbonate liquid tank connected in series. The primary reactor has a sulfur dioxide inlet on its side wall. A flow pump is installed on the connecting pipe between the secondary reactor and the primary reactor. A gas flow meter is installed at the sulfur dioxide inlet. A pH probe is installed inside the primary reactor. A crystallizer is connected to the bottom of the primary reactor via a conveying pipe, which is equipped with a conveying pump. The crystallizer is installed at a position higher than the primary reactor. An overflow pipe connected to the primary reactor is located at the top of the crystallizer, and a discharge pipe with a discharge valve is connected to the bottom of the crystallizer.

[0008] Furthermore, a cooler is provided inside the side wall of the crystallizer, and a temperature probe is provided inside the crystallizer. The cooler and the temperature probe are connected to a control unit.

[0009] Furthermore, the discharge pipe is equipped with a flushing structure, and a three-way valve is provided at the bottom of the discharge pipe. One port of the three-way valve is connected to a centrifuge, and the other port of the three-way valve is connected to a flushing liquid tank through a pipe.

[0010] Furthermore, the flushing structure includes multiple nozzles, the inner wall of the discharge pipe is provided with multiple nozzle holes, the nozzles are disposed in the nozzle holes, the nozzle holes are provided with one-way cover plates that open into the discharge pipe, the side wall of the discharge pipe is provided with pipes connecting the multiple nozzles, and the outer wall of the discharge pipe is provided with flushing connectors connecting the pipes.

[0011] Furthermore, a permanent magnet is provided on the inner side of the one-way cover plate, an electromagnet is provided inside the nozzle hole, and a switch for controlling the magnetism of the electromagnet is provided outside the discharge pipe.

[0012] Furthermore, the rinsing liquid tank is connected to the sodium carbonate liquid tank via a pipe.

[0013] Furthermore, the liquid outlet of the centrifuge is connected to a separation tank, which is a sodium carbonate liquid tank, and the solid outlet of the centrifuge is connected to a dryer.

[0014] Furthermore, a stirrer is provided in each of the primary, secondary, and tertiary reaction vessels.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects:

[0016] This invention relates to a coarse-crystal sodium metabisulfite production apparatus. The alkaline solution in the secondary reactor is pumped into the primary reactor via a flow pump (the amount added is adjusted by a gas flow meter) to absorb sulfur dioxide, forming a saturated sodium metabisulfite solution. This saturated solution is then pumped into a crystallizer for crystal formation. After crystal formation, the concentration of the sodium metabisulfite solution in the crystallizer decreases, and it flows back to the primary reactor via an overflow pipe. Through continuous circulation, the sodium metabisulfite crystals continuously increase in size within the crystallizer. Once the required quality is achieved, the crystallizer discharge valve is opened, and the resulting coarse-crystal clinker is dehydrated, dried, and packaged to obtain large-particle-size sodium metabisulfite. This invention can improve product particle size, increase the main content of the product, and extend the product agglomeration cycle. Attached Figure Description

[0017] Figure 1 This is a structural diagram of a coarse-crystal sodium metabisulfite production device according to this utility model.

[0018] Figure 2 This is a cross-sectional view of the feed tube of this utility model.

[0019] The components include: 1. Primary reactor; 101. Sulfur dioxide inlet; 2. Secondary reactor; 3. Tertiary reactor; 4. Sodium carbonate tank; 5. Stirrer; 6. Flow pump; 7. Gas flow meter; 8. pH probe; 9. Crystallizer; 10. Transfer pump; 11. Overflow pipe; 12. Discharge pipe; 13. Discharge valve; 14. Cooler; 15. Temperature probe; 16. Three-way valve; 17. Centrifuge; 18. Rinse liquid tank; 19. Separation liquid tank; 20. Dryer; 21. Nozzle; 22. One-way cover; 23. Permanent magnet; 24. Electromagnet; 25. Rinse connector. Detailed Implementation

[0020] Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] Example 1

[0022] like Figure 1-2 As shown, a crude sodium metabisulfite production apparatus includes a primary reactor 1, a secondary reactor 2, a tertiary reactor 3, and a sodium carbonate solution tank 4 connected in series. The primary reactor 1 has a sulfur dioxide inlet 101 on its side wall. Sulfur dioxide gas passes sequentially through the primary reactor 1, secondary reactor 2, and tertiary reactor 3, while the sodium carbonate solution passes sequentially through the tertiary reactor 3, secondary reactor 2, and primary reactor 1, absorbing the sulfur dioxide in a countercurrent manner to produce the sodium metabisulfite solution. Each of the primary reactor 1, secondary reactor 2, and tertiary reactor 3 is equipped with a stirrer 5 to ensure a more complete absorption reaction.

[0023] A flow pump 6 is installed on the connecting pipe between the secondary reactor 2 and the primary reactor 1 to control the amount of alkali pumped into the primary reactor 1; a gas flow meter 7 is installed on the sulfur dioxide inlet 101 to adjust the amount of sulfur dioxide added so that it matches the amount of alkali pumped into the secondary reactor 2. A pH probe 8 is installed inside the primary reactor 1 to monitor the pH value in the reactor in real time, facilitating the operator to adjust the ratio of alkali to sulfur dioxide.

[0024] The bottom of the primary reactor 1 is connected to the crystallizer 9 via a conveying pipe. A conveying pump 10 is installed on the conveying pipe to pump the saturated sodium metabisulfite solution in the primary reactor 1 into the crystallizer 9 for crystal formation. The crystallizer 9 is installed higher than the primary reactor 1. The top of the crystallizer 9 is equipped with an overflow pipe 11 connected to the primary reactor 1, and the bottom of the crystallizer 9 is connected to a discharge pipe 12. A discharge valve 13 is installed at the upper end of the discharge pipe 12.

[0025] A cooler 14 is installed inside the side wall of the crystallizer 9, and a temperature probe 15 is installed inside the crystallizer 9. The cooler 14 and the temperature probe 15 are connected to the control unit. Through the function of the cooler 14, the crystallizer 9 can maintain a stable crystallization temperature, thereby improving the crystallization effect.

[0026] The discharge pipe 12 is equipped with a rinsing structure, and a three-way valve 16 is located at the bottom of the discharge pipe 12. One port of the three-way valve 16 is connected to the centrifuge 17, and the other port of the three-way valve 16 is connected to the rinsing liquid tank 18 through a pipe. The rinsing liquid tank 18 is connected to the sodium carbonate liquid tank 4 through a pipe. The liquid outlet of the centrifuge 17 is connected to the separation liquid tank 19, which is connected to the sodium carbonate liquid tank 4. The solid outlet of the centrifuge 17 is connected to the dryer 20.

[0027] Based on the above structure, under normal circumstances, one port of the three-way valve 16 is open and the second port is closed. At this time, the crystallized slurry discharged from the discharge pipe 12 can enter the centrifuge 17. After the centrifuge 17 separates the material from the liquid, the separated liquid returns to the sodium carbonate liquid tank 4 for recycling, while the crystals enter the dryer 20 for drying, and finally the finished product is obtained. When the slurry in the discharge pipe 12 is blocked, one port of the three-way valve 16 is closed and the second port is opened. Clean water is injected into the discharge pipe 12 through the flushing structure for flushing. The flushing liquid then returns to the sodium carbonate liquid tank 4 for recycling after passing through the flushing liquid tank 18.

[0028] The flushing structure includes multiple nozzles 21, and the inner wall of the discharge pipe 12 has multiple nozzle holes, with the nozzles 21 located inside the nozzle holes. Each nozzle hole has a one-way cover 22 that opens into the discharge pipe 12, ensuring that slurry does not enter the nozzle hole during normal use. A permanent magnet 23 is located on the inner side of the one-way cover 22, and an electromagnet 24 is located inside the nozzle hole. A switch controlling the magnetism of the electromagnet 24 is located outside the discharge pipe 12. By changing the magnetism of the electromagnet 24, it can attract the permanent magnet 23 (closing the one-way cover 22) or repel the permanent magnet 23 (opening the one-way cover 22). The side wall of the discharge pipe 12 has pipes connecting to the multiple nozzles 21, and the outer wall of the discharge pipe 12 has flushing connectors 25 connecting to these pipes.

[0029] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A production apparatus for crude sodium metabisulfite, comprising a primary reactor, a secondary reactor, a tertiary reactor, and a sodium carbonate liquid tank connected in series, wherein the primary reactor has a sulfur dioxide inlet on its side wall, characterized in that: A flow pump is installed on the connecting pipe between the secondary reactor and the primary reactor. A gas flow meter is installed at the outlet of the sulfur dioxide outlet. A pH probe is installed inside the primary reactor. The bottom of the primary reactor is connected to a crystallizer via a conveying pipe. A conveying pump is installed on the conveying pipe. The crystallizer is installed at a position higher than the primary reactor. An overflow pipe connected to the primary reactor is installed at the top of the crystallizer. A discharge pipe is connected to the bottom of the crystallizer, and a discharge valve is installed on the discharge pipe.

2. The apparatus for producing crude sodium metabisulfite according to claim 1, characterized in that: The crystallizer has a cooler inside its side wall and a temperature probe inside its cavity. The cooler and the temperature probe are connected to a control unit.

3. The apparatus for producing crude sodium metabisulfite according to claim 1 or 2, characterized in that: The discharge pipe is equipped with a flushing structure, and a three-way valve is provided at the bottom of the discharge pipe. One port of the three-way valve is connected to a centrifuge, and the other port of the three-way valve is connected to a flushing liquid tank through a pipe.

4. The apparatus for producing crude sodium metabisulfite according to claim 3, characterized in that: The flushing structure includes multiple nozzles, and the inner wall of the discharge pipe is provided with multiple nozzle holes. The nozzles are disposed in the nozzle holes, and the nozzle holes are provided with one-way cover plates that open into the discharge pipe. The side wall of the discharge pipe is provided with pipelines connecting the multiple nozzles, and the outer wall of the discharge pipe is provided with flushing connectors connecting the pipelines.

5. The apparatus for producing crude sodium metabisulfite according to claim 4, characterized in that: The inner side of the one-way cover plate is provided with a permanent magnet, the nozzle hole is provided with an electromagnet, and the outside of the discharge pipe is provided with a switch to control the magnetism of the electromagnet.

6. The apparatus for producing crude sodium metabisulfite according to claim 5, characterized in that: The rinsing solution tank is connected to the sodium carbonate solution tank via a pipe.

7. The apparatus for producing crude sodium metabisulfite according to claim 6, characterized in that: The centrifuge's liquid outlet is connected to a separation tank, which is a sodium carbonate liquid tank, and the centrifuge's solid outlet is connected to a dryer.

8. The apparatus for producing crude sodium metabisulfite according to claim 7, characterized in that: A stirrer is installed in each of the primary, secondary, and tertiary reactors.

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