Settling tank
By designing a stirring device and inverted conical bottom plate in the settlement tank, the problem of sodium chloride crystals prone to agglomeration and blockage during the settlement process of magnesium chloride slurry is solved, and the effect of preventing agglomeration and ensuring smooth discharge is achieved.
Patent Information
- Application Number
- CN202420805426.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-18
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-04-18
AI Technical Summary
During the settlement process of magnesium chloride slurry in the existing settlement tank, sodium chloride crystals are prone to agglomeration and blocking the discharge pipeline, affecting normal production.
A settlement tank including a tank body and a stirring device is designed. The stirring device agitates and scrapes the sodium chloride crystals at the bottom of the settlement chamber by rotating rakes and stirring sheets to prevent agglomeration. At the same time, the sodium chloride crystals are designed to facilitate the convergence and discharge of the sodium chloride crystals.
It effectively prevents sodium chloride crystals from agglomerating at the bottom of the settlement tank, avoids blockage of the discharge pipeline, and ensures the normal operation of production.
Smart Images
Figure CN222871414U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a sedimentation tank, in particular to the structure of the sedimentation tank. Background Art
[0002] Magnesium hydroxide is an inorganic substance with chemical properties similar to aluminum. It is an excellent flame retardant for plastics and rubber products. It is often used as an oil additive, as a thermal insulation material, and in the manufacture of magnesium salt products. Magnesium hydroxide is often produced by the alkaline method, that is, magnesium chloride and sodium hydroxide are reacted to obtain magnesium hydroxide precipitate and sodium chloride, and then magnesium hydroxide is obtained by solid-liquid separation.
[0003] Magnesium chloride needs to be purified and refined when used. Purification is to add magnesium chloride and light brine into a salting-out tank for salting-out. Since the solubility of magnesium chloride is greater than that of sodium chloride, magnesium chloride is dissolved in the liquid phase, and sodium chloride crystals are precipitated to obtain magnesium chloride slurry containing sodium chloride crystals. The magnesium chloride slurry is sent to a sedimentation tank for sedimentation. The clear liquid on the top of the sedimentation tank is the magnesium chloride solution, which is discharged from the overflow port and enters the magnesium chloride refining system. The slurry at the bottom of the sedimentation tank is the sodium chloride slurry. After the sodium chloride slurry is discharged, it is separated into solid and liquid by a centrifuge. The separated solid is used to produce sodium chloride, and the separated filtrate enters the salting-out tank for recycling.
[0004] When the centrifuge separates the solid and liquid of sodium chloride slurry, the solid content in the sodium chloride slurry needs to reach 30% to 40%. When the solid content in the sodium chloride slurry is high, the sodium chloride crystals are easy to agglomerate, and the agglomeration will cause the pipeline to be blocked. Therefore, the sedimentation tank plays a vital role, which not only ensures the solid content in the sodium chloride slurry, but also ensures that the sodium chloride crystals in the sodium chloride slurry cannot agglomerate. However, the existing sedimentation tank can only play a sedimentation role, and cannot prevent the sodium chloride crystals from agglomerating when the solid content at the bottom of the sedimentation tank is high, resulting in frequent blockage of the discharge pipeline, which seriously affects normal production.
[0005] In order to prevent the sodium chloride crystals at the bottom of the sedimentation tank from agglomerating, the existing method usually uses a stirring blade to stir the slurry in the sedimentation tank to make the slurry rotate, thereby reducing the agglomeration of sodium chloride crystals. However, the effect is not good, and there will still be agglomerates blocking the discharge pipe. In addition, the existing stirring blades will affect the sedimentation efficiency of the slurry, resulting in impurities in the magnesium chloride solution.
[0006] The utility model aims to solve the problem that sodium chloride crystals are easy to agglomerate and block a discharge pipe when the existing sedimentation tank is settling magnesium chloride slurry during magnesium hydroxide production. Utility Model Content
[0007] In order to solve the above problems, the utility model provides a sedimentation tank, including a tank body 1 and a stirring device 2. The tank body 1 is cylindrical, with an upper opening, and a support plate 11 is arranged at the opening. An overflow port 12 is formed at the upper part of the side wall of the tank body 1, and a bottom plate 13 is arranged at the bottom, and a sedimentation chamber 14 is formed inside. The bottom plate 13 is an inverted cone, and a discharge port 15 is formed at the tip. The stirring device 2 includes a rotating device, a rotating shaft 22 and a rotating rake 23. The rotating device is fixedly arranged on the support plate 11. The rotating shaft 22 is arranged vertically, and the upper end is connected to the rotating device, and the lower end passes through the support plate 11 and extends into the sedimentation chamber 14. The rotating rake 23 is fixedly arranged at the lower end of the rotating shaft 22, parallel to the bottom plate 13, one end is fixedly connected to the lower end of the stirring shaft, and the other end extends to the side wall of the tank body 1. A plurality of stirring blades 24 arranged at equal intervals are arranged on the bottom surface of the rotating rake 23, and the lower end of the stirring blade 24 is close to the bottom plate 13.
[0008] When the utility model is used, magnesium chloride slurry is added into a sedimentation tank, sodium chloride crystals in the magnesium chloride slurry are settled to the bottom of a sedimentation chamber 14 under the action of gravity, a rotating device drives a rotating rake 23 to rotate through a rotating shaft 22, and the sodium chloride crystals at the bottom of the sedimentation chamber 14 are stirred through a stirring sheet 24, and the sodium chloride crystals on the bottom plate 13 are scraped and swept to prevent the sodium chloride crystals from accumulating on the bottom plate 13 and agglomerating, the clear liquid at the upper part of the sedimentation chamber 14 is a magnesium chloride solution, which is discharged from an overflow port 12 and then enters a magnesium chloride refining system for refining, the main component of the slurry at the bottom of the sedimentation chamber 14 is sodium chloride slurry, and when the solid content of the sodium chloride slurry reaches 30% to 40%, it is discharged from a discharge port 15 and then enters a centrifuge for solid-liquid separation.
[0009] The utility model is provided with a stirring device 2 on a tank body 1, the lower end of a stirring blade 24 is close to a bottom plate 13, and when the rotating device drives the rotating rake 23 to rotate, the stirring blade 24 stirs the sodium chloride crystals at the bottom of the sedimentation chamber 14, and at the same time, the sodium chloride crystals on the bottom plate 13 are scraped to prevent the sodium chloride crystals from accumulating and agglomerating on the bottom plate 13. The bottom plate 13 is provided with an inverted cone shape, and the tip forms a discharge port 15, so that the bottom surface of the sedimentation chamber 14 can form an inclined surface, which facilitates the sodium chloride crystals to gather at the discharge port 15 and discharge. The utility model can prevent the sodium chloride crystals from accumulating and agglomerating, and prevent the discharge pipe from being blocked, and solves the problem that the sodium chloride crystals are easy to agglomerate and block the discharge pipe when the existing sedimentation tank is used to settle the magnesium chloride slurry.
[0010] Preferably, the stirring blade 24 is rectangular and vertically arranged, and the angle between the stirring blade 24 and the projection of the rotating rake 23 on the plane is 45°. The stirring blade 24 is rectangular, and the angle between the stirring blade 24 and the projection of the rotating rake 23 on the plane is 45°. When the stirring blade 24 rotates, the sodium chloride slurry can be stirred to prevent the sodium chloride crystals from agglomerating, and the end located at the front side of the rotating rod in the rotating direction can break up the sodium chloride agglomerates.
[0011] Preferably, a plurality of vertically extending rake nails 25 are provided on the bottom surface of the rotating rake 23, the lower ends of the rake nails 25 are close to the bottom plate 13, and the plurality of rake nails 25 and the plurality of stirring blades 24 are arranged at intervals from each other. When the rotating rake 23 rotates, the rake nails 25 can break up the sodium chloride agglomerates to prevent clogging of the pipeline.
[0012] Preferably, the angle between the generatrix of the conical structure of the bottom plate 13 and the axis L is 70°. The angle between the generatrix of the conical structure of the bottom plate 13 and the axis L is set to 70°, so that the bottom surface of the sedimentation chamber 14 is an inclined surface with a suitable angle, which facilitates the sodium chloride crystals to gather at the discharge port 15 for discharge.
[0013] Preferably, a reinforcing rod 26 is provided on the rotating rake 23, one end of the reinforcing rod 26 is fixedly connected to the rotating rake 23, and the other end is fixedly connected to the rotating shaft 22. The reinforcing rod 26 can enhance the firmness of the connection between the rotating rake 23 and the rotating shaft 22.
[0014] Preferably, the rotating device is a rotating motor 21 .
[0015] Preferably, a reducer 3 is further included, which is fixedly arranged on the support plate 11 , the input shaft of the reducer 3 is fixedly connected to the rotating shaft of the rotating motor 21 , and the output shaft is fixedly connected to the upper end of the rotating shaft 22 .
[0016] Preferably, a plurality of supporting legs 16 are provided at the bottom of the tank body 1, and the plurality of supporting legs 16 are evenly distributed along the periphery of the tank body 1. The tank body 1 can be supported by the supporting legs 16 to keep the tank body 1 stable.
[0017] Preferably, a discharge valve 151 is provided on the discharge port 15. The discharge valve 151 controls the discharge port 15 to discharge the sodium chloride slurry with a mass concentration meeting the requirements at the bottom of the sedimentation chamber 14 at a fixed time. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 .Schematic diagram of the overall structure of the sedimentation tank;
[0019] Figure 2 . Schematic diagram of the internal structure of the tank;
[0020] Figure 3 . Figure 2 The enlarged schematic diagram of point B in the middle;
[0021] Figure 4 . Figure 1 Schematic diagram of the AA section;
[0022] Figure 5 . Figure 4 Enlarged schematic diagram at point C in the middle.
[0023] In the figure, 1. trough body, 11. support plate, 12. overflow port, 13. bottom plate, 14. sedimentation chamber, 15. discharge port, 151. discharge valve, 16. support leg, 2. stirring device, 21. rotating motor, 22. rotating shaft, 23. rotating rake, 24. stirring blade, 25. rake nail, 26. reinforcing rod, 3. reducer. DETAILED DESCRIPTION
[0024] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.
[0025] like Figure 1 and Figure 2 As shown, the sedimentation tank includes a tank body 1, a stirring device 2 and a reducer 3. The tank body 1 is cylindrical, with an opening at the top, and a support plate 11 is arranged at the opening. An overflow port 12 is formed at the upper part of the side wall of the tank body 1, and a bottom plate 13 is arranged at the bottom, and a sedimentation chamber 14 is formed inside.
[0026] The bottom of the tank body 1 is provided with three supporting legs 16, and the three supporting legs 16 are evenly distributed along the periphery of the tank body 1. The tank body 1 can be supported by the supporting legs 16, so that the tank body 1 remains stable.
[0027] The bottom plate 13 is in an inverted cone shape, and the tip forms a discharge port 15, and a discharge valve 151 is provided on the discharge port 15. The angle between the generatrix of the conical structure of the bottom plate 13 and the axis L is 70°, referring to Figure 3 .
[0028] The angle between the generatrix and the axis of the conical structure of the bottom plate 13 is set to 70°, so that the bottom surface of the sedimentation chamber 14 is an inclined surface with a suitable angle, so that the sodium chloride crystals can be gathered and discharged at the discharge port 15. The discharge port 15 is controlled by the discharge valve 151 to discharge the sodium chloride slurry with a mass concentration that meets the requirements at the bottom of the sedimentation chamber 14 at a regular time.
[0029] like Figure 2 and Figure 4 As shown, the stirring device 2 includes a rotating device, a rotating shaft 22 and a rotating rake 23 . The rotating device is a rotating motor 21 , which is fixedly arranged on the support plate 11 .
[0030] The reducer 3 is fixedly disposed on the support plate 11 , and an input shaft of the reducer 3 is fixedly connected to a rotating shaft of the rotary motor 21 .
[0031] The rotating shaft 22 is vertically arranged, with the upper end fixedly connected to the output shaft of the reducer 3 , and the lower end extending through the support plate 11 to the sedimentation chamber 14 .
[0032] The rotating rake 23 is rod-shaped and fixedly disposed at the lower end of the rotating shaft 22 , parallel to the bottom plate 13 , with one end fixedly connected to the lower end of the stirring shaft and the other end extending close to the side wall of the tank body 1 .
[0033] The rotating rake 23 is parallel to the bottom plate 13, which means that the rotating rake 23 is parallel to the generatrix of the conical structure of the bottom plate 13, that is, the angle between the rotating rake 23 and the rotating shaft 22 is 70°. Figure 3 .
[0034] The rotating rake 23 is provided with a reinforcing rod 26, one end of which is fixedly connected to the rotating rake 23, and the other end of which is fixedly connected to the rotating shaft 22. The reinforcing rod 26 can enhance the firmness of the connection between the rotating rake 23 and the rotating shaft 22.
[0035] A plurality of stirring blades 24 and a plurality of rake nails 25 are arranged on the bottom surface of the rotating rake 23. The plurality of stirring blades 24 are arranged at equal intervals.
[0036] The stirring blade 24 is rectangular and vertically arranged. The lower end of the stirring blade 24 is close to the bottom plate 13. The angle between the stirring blade 24 and the projection of the rotating rake 23 on the plane is 45°. Figure 5 .
[0037] The rake nails 25 extend vertically, and the lower ends of the rake nails 25 are close to the bottom plate 13 . The plurality of rake nails 25 and the plurality of stirring blades 24 are arranged at intervals from each other.
[0038] The stirring blade 24 is set to be rectangular, and the angle between the stirring blade 24 and the projection of the rotating rake 23 on the plane is 45°. When the stirring blade 24 rotates, the sodium chloride slurry can be stirred to prevent the sodium chloride crystals from agglomerating, and the end located at the front side of the rotating direction of the rotating rod can break up the sodium chloride agglomerates, and the rake nails 25 can further break up the sodium chloride agglomerates to prevent clogging of the pipeline.
[0039] When the utility model is used, magnesium chloride slurry is added into a sedimentation tank, and sodium chloride crystals in the magnesium chloride slurry are settled to the bottom of a sedimentation chamber 14 under the action of gravity. When a rotating motor drives a rotating rake 23 to rotate, the sodium chloride crystals at the bottom of the sedimentation chamber 14 are stirred by a stirring sheet 24 and a rake nail 25, and the sodium chloride crystals on the bottom plate 13 are scraped and swept to prevent the sodium chloride crystals from accumulating on the bottom plate 13 and agglomerating, and the sodium chloride agglomerates are broken at the same time. The clear liquid at the upper part of the sedimentation chamber 14 is a magnesium chloride solution, which is discharged from the overflow port 12 and then enters a magnesium chloride refining system for refining. The main component of the slurry at the bottom of the sedimentation chamber 14 is sodium chloride slurry. When the solid content of the sodium chloride slurry reaches 30% to 40%, it is discharged from the discharge port 15 and then enters a centrifuge for solid-liquid separation.
[0040] The utility model provides a stirring device 2 on the tank body 1, and a rotating motor 21 drives a rotating rake 23 to rotate through a rotating shaft 22, and stirs the sodium chloride crystals at the bottom of the sedimentation chamber 14 through a stirring blade 24 and a rake nail 25, and at the same time scrapes the sodium chloride crystals on the bottom plate 13, so as to prevent the sodium chloride crystals from accumulating on the bottom plate 13 and agglomerating, and at the same time crushes the sodium chloride agglomerates. The bottom plate 13 is set to be an inverted cone, and the tip forms a discharge port 15, so that the bottom surface of the sedimentation chamber 14 can form an inclined surface, so that the sodium chloride crystals are conveniently gathered at the discharge port 15 for discharge.
[0041] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims.
Claims
1. A sedimentation tank, characterized in that: It comprises a tank body (1) and a stirring device (2). The tank body (1) is cylindrical, with an opening at the top, a support plate (11) is arranged at the opening, an overflow port (12) is formed at the upper part of the side wall of the tank body (1), a bottom plate (13) is arranged at the bottom, and a sedimentation chamber (14) is formed inside; The bottom plate (13) is in an inverted cone shape, and the tip forms a discharge port (15); The stirring device (2) comprises a rotating device, a rotating shaft (22) and a rotating rake (23). The rotating device is fixedly arranged on the supporting plate (11); The rotating shaft (22) is arranged vertically, with the upper end connected to the rotating device and the lower end passing through the supporting plate (11) and extending into the sedimentation chamber (14); The rotating rake (23) is fixedly arranged at the lower end of the rotating shaft (22), parallel to the bottom plate (13), one end of which is fixedly connected to the lower end of the stirring shaft, and the other end of which extends to the side wall of the tank body (1), and a plurality of stirring blades (24) arranged at equal intervals are arranged on the bottom surface of the rotating rake (23); The lower end of the stirring blade (24) is close to the bottom plate (13).
2. The sedimentation tank according to claim 1, characterized in that: The stirring blade (24) is rectangular and vertically arranged, and the angle between the stirring blade (24) and the projection of the rotating rake (23) on the plane is 45°.
3. The sedimentation tank according to claim 2, characterized in that: A plurality of vertically extending rake spikes (25) are arranged on the bottom surface of the rotating rake (23). The lower end of the rake nail (25) is close to the bottom plate (13); The plurality of rake nails (25) and the plurality of stirring blades (24) are arranged at intervals from each other.
4. The sedimentation tank according to claim 3, characterized in that: The angle between the generatrix of the conical structure of the bottom plate (13) and the axis is 70°.
5. The sedimentation tank according to claim 4, characterized in that: The rotating rake (23) is provided with a reinforcing rod (26). One end of the reinforcing rod (26) is fixedly connected to the rotating rake (23), and the other end is fixedly connected to the rotating shaft (22).
6. The sedimentation tank according to claim 5, characterized in that: The rotating device is a rotating motor (21).
7. The sedimentation tank according to claim 6, characterized in that: It also includes a reducer (3), The reducer (3) is fixedly arranged on the support plate (11); the input shaft of the reducer (3) is fixedly connected to the rotating shaft of the rotating motor (21); and the output shaft is fixedly connected to the upper end of the rotating shaft (22).
8. The sedimentation tank according to claim 7, characterized in that: The bottom of the tank body (1) is provided with a plurality of supporting legs (16). The plurality of support legs (16) are evenly distributed along the outer circumference of the tank body (1).
9. The settling tank according to any one of claims 1 to 8, characterized in that: The discharge port (15) is provided with a discharge valve (151).