A device for producing superphosphoric acid

Abstract

The present application relates to the technical field of production of superphosphate, and proposes a superphosphate production device, which can realize temporary storage of added phosphorite powder and sulfuric acid, and can continue to add phosphorite powder and sulfuric acid during the discharging process of the mixed material after stirring, at this time, the phosphorite powder and sulfuric acid enter the temporary storage pool, the mutual influence between the placement of raw materials and the discharging of the mixed material is small, the production efficiency is improved, the material in the transfer temporary storage structure after the discharging of the stirred mixed material can automatically enter the reaction tank, the coupling between the two links is good, and the device comprises a shell, a phosphorite adding hopper is installed on the shell, a sulfuric acid adding pipe is arranged on the side of the phosphorite adding hopper, a discharging elbow pipe is further arranged, the discharging elbow pipe is connected to the bottom end of the shell, an electromagnetic on-off valve is installed on the discharging elbow pipe, a vertical shaft is rotatably connected in the shell, a spiral stirring plate is fixedly connected to the vertical shaft, an inner lining ring is fixedly connected in the shell, and a closed bottom plate is arranged in the inner lining ring.

Description

Technical Field

[0001] This invention relates to the field of superphosphate production technology, and specifically to a superphosphate production apparatus. Background Technology

[0002] As is well known, superphosphate, also known as ordinary superphosphate, is a water-soluble phosphate fertilizer that can be obtained by directly decomposing phosphate rock with sulfuric acid. It has many advantages such as simple production process and quick effect after application. The production of superphosphate usually requires first crushing the phosphate rock, then adding sulfuric acid for mixing, followed by ripening, neutralization, granulation, drying and packaging. In order to ensure the mixing quality and improve the reaction efficiency when mixing phosphate rock powder and sulfuric acid, a superphosphate production device is proposed.

[0003] A search revealed that Chinese patent CN215234221U, published on December 21, 2021, discloses a phosphate rock and sulfuric acid mixer. Its general description includes a shell, a heat-conducting inner shell fixed to the inner side of the shell, a heating wire inside the heat-conducting inner shell, a motor mounted on the upper surface of the shell, an output shaft passing through the upper surface of the shell, a rotating shaft mounted on the output shaft, and helical blades fixed to the side of the rotating shaft. A phosphate rock adding funnel is located on the upper surface of the heat-conducting inner shell, and sulfuric acid is added to the side of the phosphate rock adding funnel. The phosphate rock adding funnel has a threaded protrusion on its inner side. A sampling tube is fixed to the side of the shell, and a valve is located on the side of the sampling tube below it. A U-shaped fixing plate is fixed to the side of the shell, and the U-shaped fixing plate has a sampling groove inside. In use, phosphate rock is placed inside the phosphate rock adding funnel, and sulfuric acid is added through the sulfuric acid adding tube. The phosphate rock and sulfuric acid flow along the adding tube on the phosphate rock adding funnel, and are blocked by the threaded protrusion, causing the phosphate rock and sulfuric acid to mix in the phosphate rock adding funnel. The internal tumbling of the tube added to the funnel achieves premixing, improving mixing efficiency and reducing reaction time. The spiral blades are conical at the bottom and have the same shape as the internal cavity of the shell, which can stir the phosphate rock and sulfuric acid inside the shell as a whole, avoiding dead zones. Four fixing columns and fixing rings can assist in fixing the phosphate rock adding funnel to prevent damage to the phosphate rock and sulfuric acid during the addition process. The motor drives the shaft to rotate, and the rotation of the shaft drives the spiral blades to rotate. The rotation of the spiral blades, through centrifugal force and upward thrust, further stirs the phosphate rock and sulfuric acid inside the shell in multiple directions. Opening valve one allows the mixture after the reaction of phosphate rock and sulfuric acid to fall into the sampling tank through the sampling tube, allowing sampling of the mixture after the reaction to understand the effect of the mixing reaction. The positioning column and positioning groove can position the sampling tank inside the U-shaped fixing plate, so that the sampling tank is below the sampling tube outlet. The exhaust pipe and sealing flange can be connected to the external gas pipeline, thereby centrally treating the waste gas generated by the reaction. Opening valve two allows the mixture after the reaction to be discharged through the discharge pipe.

[0004] Although the above-mentioned existing technical solution can be used for the auxiliary mixing of phosphate rock powder and sulfuric acid, in order to ensure the production quality of superphosphate, the addition of phosphate rock powder and sulfuric acid needs to be suspended during the discharge process. Only after the mixture is discharged can phosphate rock powder and sulfuric acid be added again to resume production, which is quite time-consuming and the production efficiency needs to be further improved. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a superphosphate production apparatus that can temporarily store added phosphate rock powder and sulfuric acid. During the discharge of the mixture after stirring, phosphate rock powder and sulfuric acid can be added again. At this time, the phosphate rock powder and sulfuric acid enter the temporary storage tank. The mutual influence between the addition of raw materials and the discharge of the mixture is small, which improves production efficiency. At the same time, after the stirred mixture is discharged, the material in the transfer temporary storage tank can automatically enter the reaction tank, and the coupling between the two links is good.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a superphosphate production apparatus, comprising a shell, on which a phosphate rock adding funnel is installed, and a sulfuric acid adding pipe is provided on the side of the phosphate rock adding funnel; further comprising a discharge bend connected to the bottom end of the shell, and an electromagnetic on / off valve installed on the discharge bend; a vertical shaft rotatably connected inside the shell, and a spiral stirring plate fixedly connected to the vertical shaft; an inner liner ring fixedly connected inside the shell, and a closed bottom plate provided inside the inner liner ring; a plurality of support springs fixedly connected to the bottom end of the closed bottom plate; a support block fixedly connected to the bottom end of each of the plurality of support springs; and a plurality of support blocks fixedly connected to... An inner hole is formed on the inner wall of the shell and the closed bottom plate. A support cylinder is fixedly connected to the inner hole. The inner wall of the support cylinder is clearance-fitted with the outer wall of the vertical shaft. A lifting ring is slidably connected to the vertical shaft. Multiple stirring blades are fixedly connected to the outer wall of the lifting ring. The bottom ends of the multiple stirring blades are in contact with the top end of the closed bottom plate. The lifting ring is rotatably connected to the support cylinder. A working plate is rotatably connected to the top end of the lifting ring. An electric telescopic rod is installed on the working plate. The electric telescopic rod is installed at the top end of the shell. A variable frequency motor is installed on the shell. The variable frequency motor is used to drive the rotation of the vertical shaft. An auxiliary support assembly for the vertical shaft is installed inside the shell.

[0007] Based on the aforementioned scheme, the auxiliary support assembly includes a support plate with an upper groove. The vertical shaft is rotatably connected in the upper groove, and multiple side support rods are fixedly connected to the side wall of the support plate. All of the multiple side support rods are fixedly connected in the housing.

[0008] In a preferred embodiment based on the aforementioned scheme, the vertical shaft is provided with multiple vertical grooves, each of which is slidably connected to a slider, and each slider is fixedly connected to the lifting ring.

[0009] Furthermore, based on the aforementioned scheme, the outer wall of the closed bottom plate adopts a sloping structure, and the bottom end of the inner lining ring is provided with a chamfered ring, which matches the sloping structure on the closed ring.

[0010] Furthermore, based on the aforementioned solution, the bottom end of the closed base plate is fixedly connected to multiple guide rods, and multiple guide grooves are provided on the inner side wall of the housing, with the multiple guide rods slidingly engaged in the multiple guide grooves respectively.

[0011] Furthermore, based on the aforementioned solution, a guide plate is fixedly connected to the working plate, a guide block is fixedly connected to the guide plate, a guide hole is provided on the housing, and the guide block is slidably fitted into the guide hole.

[0012] As a further embodiment of the above scheme, a guide ring is fixedly connected to the top of the housing, the guide block is slidably fitted inside the guide ring, and a limit block is fixedly connected to the top of the guide rod. The diameter of the limit block is larger than the inner diameter of the guide ring, and the inner diameter of the guide ring is equal to the diameter of the guide hole.

[0013] As a further step of the above scheme, the multiple guide rods and multiple support blocks are alternately arranged at intervals.

[0014] (III) Beneficial Effects Compared with the prior art, the present invention provides a superphosphate production apparatus, which has the following beneficial effects: 1. In this invention, an annular temporary storage tank is formed by the cooperation of an inner lining ring, a closed bottom plate, and a support cylinder. This allows for the temporary storage of added phosphate rock powder and sulfuric acid. During the discharge of the mixture after stirring, phosphate rock powder and sulfuric acid can continue to be added. At this time, the phosphate rock powder and sulfuric acid enter the temporary storage tank. The mutual influence between the addition of raw materials and the discharge of the mixture is small, thus improving production efficiency.

[0015] 2. In this invention, the design of the stirring blades enables the mixing of phosphate rock powder and sulfuric acid in the temporary storage tank. Multiple stirring blades are installed through the cooperation of the lifting ring, working plate, and electric telescopic rod, allowing them to rotate synchronously with the vertical shaft. The stirring blades can be adjusted in height, and the closed bottom plate can be adjusted relative to the inner lining ring as the lifting ring is adjusted. This controls whether the temporary storage tank leaks, further enabling the temporary storage and release of phosphate rock powder and sulfuric acid in the tank.

[0016] 3. In this invention, the design of the auxiliary support component forms support for the vertical axis, reducing the rotational runout of the vertical axis and thus ensuring the stable movement of the vertical axis. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram showing a partial cross-section of the present invention; Figure 2 For the present invention Figure 1 A magnified schematic diagram of the local structure at point A; Figure 3This is a three-dimensional structural diagram of the entire invention; Figure 4 This is a three-dimensional structural schematic diagram with a partial cross-section of the present invention; Figure 5 For the present invention Figure 4 A magnified view of the structure at point B in the middle; Figure 6 This is a three-dimensional structural diagram showing the assembly of the support cylinder, lifting ring, and stirring blades of the present invention. Figure 7 This is a three-dimensional structural diagram of the cooperation between the support plate and the side support rod of the present invention; Figure 8 This is a three-dimensional structural diagram of the entire invention from another angle.

[0018] In the diagram: 1. Shell; 2. Discharge bend; 3. Electromagnetic on / off valve; 4. Vertical shaft; 5. Spiral mixing plate; 6. Inner liner ring; 7. Sealed bottom plate; 8. Support spring; 9. Support block; 10. Inner hole; 11. Support cylinder; 12. Lifting ring; 13. Mixing blade; 14. Working plate; 15. Electric telescopic rod; 16. Variable frequency motor; 17. Support plate; 18. Upper groove; 19. Side support rod; 20. Vertical groove; 21. Slider; 22. Chamfered ring; 23. Guide rod; 24. Guide groove; 25. Guide plate; 26. Guide block; 27. Guide hole; 28. Guide ring; 29. ​​Limiting block. Detailed Implementation

[0019] Example

[0020] Please see Figure 1-8A superphosphate production apparatus includes a shell 1, on which a phosphate rock adding funnel is installed. A sulfuric acid adding pipe is located on the side of the phosphate rock adding funnel. The apparatus also includes a discharge bend 2 connected to the bottom of the shell 1, and an electromagnetic on / off valve 3 is installed on the discharge bend 2. A vertical shaft 4 is rotatably connected inside the shell 1, and a spiral stirring plate 5 is fixedly connected to the vertical shaft 4. An inner liner ring 6 is fixedly connected inside the shell 1, and a closed bottom plate 7 is installed inside the inner liner ring 6. The outer wall of the closed bottom plate 7 has a sloping structure. A chamfered ring 22 is provided at the bottom end of the inner liner ring 6. The chamfered ring 22 matches the sloping structure on the closed ring, increasing the contact area between the closed bottom ring and the inner liner ring 6, thus ensuring a better seal. Multiple guide rods 23 are fixedly connected to the bottom end of the closed bottom plate 7. Multiple guide grooves 24 are provided on the inner wall of the shell 1, and the multiple guide rods 23 slide... Multiple guide rods 23 and multiple support blocks 9 are alternately arranged in multiple guide grooves 24 to ensure uniform distribution among the guide rods 23 and support blocks 9, making the force on the closed base plate 7 more uniform. Multiple support springs 8 are fixedly connected to the bottom end of the closed base plate 7, and support blocks 9 are fixedly connected to the bottom end of each support spring 8. The support blocks 9 are fixedly connected to the inner side wall of the shell 1. An inner hole 10 is opened on the closed base plate 7, and a support cylinder 11 is fixedly connected inside the inner hole 10. Through the cooperation of the inner lining ring 6, the closed base plate 7 and the support cylinder 11, an annular temporary storage pool is formed, which can realize the temporary storage of added phosphate rock powder and sulfuric acid. During the discharge of the mixture after stirring, phosphate rock powder and sulfuric acid can continue to be added. At this time, phosphate rock powder and sulfuric acid enter the temporary storage pool. The mutual influence between the addition of raw materials and the discharge of the mixture is small, which improves production efficiency.

[0021] It should be further explained that the inner wall of the support cylinder 11 is clearance-fitted with the outer wall of the vertical shaft 4. A lifting ring 12 is slidably connected to the vertical shaft 4. Multiple vertical grooves 20 are provided on the vertical shaft 4, and sliders 21 are slidably connected in each of the multiple vertical grooves 20. The multiple sliders 21 are all fixedly connected to the lifting ring 12 to ensure the directional stability of the lifting ring 12 relative to the vertical shaft 4. Multiple stirring blades 13 are fixedly connected to the outer wall of the lifting ring 12. The bottom ends of the multiple stirring blades 13 are in contact with the top end of the closed bottom plate 7. Through the design of the stirring blades 13, the phosphate rock powder and sulfuric acid in the temporary storage tank are stirred and mixed. The lifting ring 12 is rotatably connected to the support cylinder 11. A working plate 14 is rotatably connected to the top of the lifting ring 12. An electric telescopic rod 15 is installed on the working plate 14 and mounted on the top of the housing 1. Through the cooperation of the lifting ring 12, the working plate 14, and the electric telescopic rod 15, multiple stirring blades 13 are installed, allowing them to rotate synchronously with the vertical shaft 4. The stirring blades 13 can be adjusted in height. With the adjustment of the lifting ring 12, the closed bottom plate 7 can be adjusted relative to the inner lining ring 6, thereby controlling whether the temporary storage tank leaks, and further controlling the liquid level within the temporary storage tank. The temporary storage and descent of phosphate rock powder and sulfuric acid are handled by a guide plate 25 fixedly connected to the working plate 14, a guide block 26 fixedly connected to the guide plate 25, and a guide hole 27 provided on the housing 1. The guide block 26 is slidably fitted within the guide hole 27 to improve the stability of the working plate 14 relative to the housing 1 during its lifting and lowering motion and to reduce the squeezing force of the lifting ring 12 on the vertical shaft 4 during its adjustment. A guide ring 28 is fixedly connected to the top of the housing 1, and the guide block 26 is slidably fitted within the guide ring 28. A limit block 29 is fixedly connected to the top of the guide rod 23, and the diameter of the limit block 29 is larger than the inner diameter of the guide ring 28. The inner diameter of the guide ring 28 is equal to the diameter of the guide hole 27. A variable frequency motor 16 is installed on the housing 1. The variable frequency motor 16 is used to drive the rotation of the vertical shaft 4. An auxiliary support assembly for the vertical shaft 4 is installed inside the housing 1. The auxiliary support assembly includes a support plate 17. An upper groove 18 is opened on the support plate 17. The vertical shaft 4 is rotatably connected in the upper groove 18. Multiple side support rods 19 are fixedly connected to the side wall of the support plate 17. The multiple side support rods 19 are all fixedly connected inside the housing 1. Through the design of the auxiliary support assembly, support is formed for the vertical shaft 4, reducing the rotational runout of the vertical shaft 4, thereby ensuring the stable movement of the vertical shaft 4.

[0022] In this embodiment, the electromagnetic on / off valve 3, the electric telescopic rod 15, and the variable frequency motor 16 are all commercially available conventional devices known to those skilled in the art. Other models can also be selected or customized according to actual needs. In this patent, we only use them without improving their structure and function. Their setting method, installation method, and electrical connection method can be easily explained by those skilled in the art by following the instructions for use. Therefore, we will not elaborate on them here.

[0023] In summary, the working process of this superphosphate production device is as follows: First, place the device at the desired location. Connect the electromagnetic on / off valve 3, electric telescopic rod 15, and frequency converter motor 16 to their respective control circuits according to their instruction manuals. Add phosphate rock powder and sulfuric acid through the phosphate rock adding funnel and sulfuric acid adding pipe, respectively. The added phosphate rock powder and sulfuric acid enter the housing 1 under their own gravity and fall onto the closed bottom plate 7. Control the electric telescopic rod 15 to push the working plate 14 downwards, causing the lifting ring 12 to move downwards relative to the vertical shaft 4. As the lifting ring 12 moves downwards, the support cylinder 11 also moves downwards synchronously. The downward movement of the support cylinder 11 causes the closed bottom plate 7 to overcome the elastic force of multiple support springs 8 and move downwards. In this state, the chamfered ring 22 at the bottom of the inner lining ring 6 separates from the closed bottom plate 7, forming a gap between the inner lining ring 6 and the closed bottom plate 7. The phosphate rock powder and sulfuric acid falling onto the closed bottom plate 7 will flow down within this gap. The frequency converter motor 16 drives the vertical shaft 4 to rotate. 4. Rotation drives the spiral stirring plate 5 to rotate, which mixes the phosphate rock powder and sulfuric acid entering the shell 1, thereby promoting the formation of the mixture. When the mixture needs to be discharged, the bottom sealing plate is raised by the electric telescopic rod 15, which disables the fit gap between the bottom sealing plate and the inner lining ring 6. In this state, the inner lining ring 6 and the sealed bottom plate 7 cooperate to form a temporary storage tank that can accommodate the phosphate rock powder and sulfuric acid. When phosphate rock powder and sulfuric acid are added again, the phosphate rock powder and sulfuric acid that fall on the sealed bottom plate 7 will be temporarily stored in the stirring tank. Maintaining this state, the electromagnetic on-off valve 3 is opened, allowing the mixture to be discharged under the guidance of the discharge bend 2. After the mixture is discharged, the electromagnetic on-off valve 3 is closed, the discharge bend 2 is closed, and the electric telescopic rod 15 is controlled to make the lifting ring 12 fall. The lifting ring 12 falls, and the sealed bottom plate 7 and the inner lining ring 6 form a gap again, allowing the phosphate rock powder and sulfuric acid in the temporary storage tank to fall out. After that, the subsequent stirring operation can be carried out again by the spiral stirring plate 5.

Claims

1. A superphosphate production apparatus, comprising a shell (1), wherein a phosphate rock adding funnel is installed on the shell (1), and a sulfuric acid adding pipe is provided on the side of the phosphate rock adding funnel, characterized in that, It also includes a discharge bend (2), which is connected to the bottom end of the housing (1). An electromagnetic on / off valve (3) is installed on the discharge bend (2). A vertical shaft (4) is rotatably connected inside the housing (1). A spiral stirring plate (5) is fixedly connected to the vertical shaft (4). An inner liner ring (6) is fixedly connected inside the housing (1). A closed bottom plate (7) is provided inside the inner liner ring (6). A plurality of support springs (8) are fixedly connected to the bottom end of the closed bottom plate (7). A support block (9) is fixedly connected to the bottom end of each of the support springs (8). The support blocks (9) are fixedly connected to the inner side wall of the housing (1). An inner hole (10) is opened on the closed bottom plate (7). A support cylinder (11) is fixedly connected inside the inner hole (10). The inner side wall of the support cylinder (11) is clearance-fitted with the outer side wall of the vertical shaft (4). A sliding connection is provided on the vertical shaft (4). There is a lifting ring (12), and multiple stirring blades (13) are fixedly connected to the outer wall of the lifting ring (12). The bottom ends of the multiple stirring blades (13) are in contact with the top end of the closed bottom plate (7). The lifting ring (12) is rotatably connected to the support cylinder (11). The top end of the lifting ring (12) is rotatably connected to the working plate (14). An electric telescopic rod (15) is installed on the working plate (14). The electric telescopic rod (15) is installed on the top end of the housing (1). A variable frequency motor (16) is installed on the housing (1). The variable frequency motor (16) is used to drive the rotation of the vertical shaft (4). An auxiliary support component for the vertical shaft (4) is installed inside the housing (1). The outer wall of the closed bottom plate (7) adopts a sloping structure. A chamfered ring (22) is provided at the bottom end of the inner lining ring (6). The chamfered ring (22) matches the sloping structure on the closed ring.

2. The superphosphate production apparatus according to claim 1, characterized in that, The auxiliary support assembly includes a support plate (17), on which an upper groove (18) is provided. The vertical shaft (4) is rotatably connected in the upper groove (18). Multiple side support rods (19) are fixedly connected to the side wall of the support plate (17), and the multiple side support rods (19) are all fixedly connected in the housing (1).

3. The superphosphate production apparatus according to claim 2, characterized in that, The vertical shaft (4) has multiple vertical grooves (20), and each of the multiple vertical grooves (20) has a slider (21) slidably connected to it. Each of the multiple sliders (21) is fixedly connected to the lifting ring (12).

4. A superphosphate production apparatus according to claim 3, characterized in that, The bottom end of the closed base plate (7) is fixedly connected with multiple guide rods (23), and multiple guide grooves (24) are opened on the inner side wall of the housing (1). The multiple guide rods (23) are respectively slidably engaged in the multiple guide grooves (24).

5. A superphosphate production apparatus according to claim 4, characterized in that, A guide plate (25) is fixedly connected to the working plate (14), and a guide block (26) is fixedly connected to the guide plate (25). A guide hole (27) is provided on the housing (1), and the guide block (26) slides in the guide hole (27).

6. A superphosphate production apparatus according to claim 5, characterized in that, The top of the housing (1) is fixedly connected to a guide ring (28), and the guide block (26) is slidably fitted inside the guide ring (28). The top of the guide rod (23) is fixedly connected to a limit block (29). The diameter of the limit block (29) is greater than the inner diameter of the guide ring (28), and the inner diameter of the guide ring (28) is equal to the diameter of the guide hole (27).

7. A superphosphate production apparatus according to claim 6, characterized in that, The multiple guide rods (23) and multiple support blocks (9) are alternately arranged at intervals.

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