Phosphogypsum calcining device

Abstract

The utility model discloses an ardealite calcining device, and belongs to the field of ardealite calcining, the ardealite calcining device comprises a calcining furnace, a sealing cover is hinged to one end of the calcining furnace, a scraper is rotatably arranged in the calcining furnace, the scraper slides on the inner wall of the calcining furnace, and a driving assembly for driving the scraper to rotate is arranged in the calcining furnace. And a cleaning assembly for cleaning the scraper blade is arranged in the calcining furnace. The method has the effects of saving resources and improving the production efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of phosphogypsum calcination, and in particular to a phosphogypsum calcination device. Background Art

[0002] Phosphogypsum is a solid waste generated in the wet phosphoric acid process. It has a wide range of applications and complex composition. It is generally gray-black or gray-white, with a particle diameter of 5 to 50 μm, a crystal water content of 20% to 25%, high viscosity and poor fluidity. As an industrial solid waste, phosphogypsum has broad application prospects in many fields such as building materials, agriculture, and environmental governance. Through reasonable pretreatment and comprehensive utilization technology, the win-win situation of resource utilization of phosphogypsum and environmental protection can be effectively achieved.

[0003] The pretreatment process of phosphogypsum includes water washing and purification, flotation, high-temperature calcination, lime neutralization, ball milling and screening, and aging treatment. Among them, high-temperature calcination is one of the most effective methods to remove eutectic phosphorus impurities in phosphogypsum. Most of the existing calcining furnaces are drum-type calcining furnaces. When the calcining drum rotates, its water content is high and its adhesion ability is strong. It often adheres to the inner wall of the drum, affecting calcination, thereby reducing production efficiency and wasting resources. Utility Model Content

[0004] In order to save resources and improve production efficiency, the present application provides a phosphogypsum calcining device.

[0005] The present application provides a phosphogypsum calcining device adopts the following technical solution:

[0006] A phosphogypsum calcining device includes a calcining furnace, one end of which is hinged with a sealing cover, a scraper is rotatably arranged in the calcining furnace, the scraper slides on the inner wall of the calcining furnace, a driving component for driving the scraper to rotate is arranged in the calcining furnace, and a cleaning component for cleaning the scraper is arranged in the calcining furnace.

[0007] By adopting the above technical scheme, during the process of calcining phosphogypsum in the calcining furnace, the driving component drives the scraper to rotate relative to the calcining furnace. When the scraper rotates, one end thereof abuts against and slides on the inner wall of the calcining furnace, thereby being able to shovel the phosphogypsum attached to the inner wall of the calcining furnace away from the inner wall of the calcining furnace. Under the action of the cleaning component, the scraper reduces the possibility of phosphogypsum sticking to its own side wall, thereby reducing the incomplete calcination of phosphogypsum and the resulting decline in calcination quality. At the same time, it saves resources, avoids the waste of calcined gypsum attached to the inner wall, and improves production efficiency.

[0008] Preferably, the driving assembly includes a motor and a rotating rod, an outer side wall of the calcining furnace is fixedly connected to an insulation plate at one end away from the sealing cover, the motor is fixedly mounted on the insulation plate, the rotating rod is fixedly connected to the rotating shaft of the motor, the rotating rod is passed through the calcining furnace, and the scraper is connected to the rotating rod.

[0009] By adopting the above technical solution, the motor is installed on the insulation board to reduce the possibility of the motor being damaged by high temperature; after the rotation frequency and speed of the motor are set before starting, when the motor rotates, it drives the rotating rod to rotate, and the rotation of the rotating rod drives the scraper to rotate, thereby cleaning the phosphogypsum stuck to the inner wall of the calcining furnace.

[0010] Preferably, a limiting block is fixedly connected to the rotating rod, and a limiting groove for inserting the limiting block is provided on the scraper.

[0011] By adopting the above technical solution, the part of the scraper that contacts the inner wall of the calcining furnace may be worn after working for a long time, reducing the cleaning effect of the scraper; at this time, the staff can pull the scraper to slide off the rotating rod before the calcining furnace starts calcining, and then replace it with a new scraper. After aligning the limiting groove on the new scraper with the limiting block on the rotating rod, the scraper is pushed into the calcining furnace to complete the replacement of the scraper. When the rotating rod rotates, the scraper rotates together with the limit block.

[0012] Preferably, the cleaning assembly comprises a scraper block and a hydraulic cylinder, the scraper block is slidably connected to the scraper plate, and the piston of the hydraulic cylinder is penetrated through the sealing cover and fixedly connected to the scraper block.

[0013] By adopting the above technical solution, after the scraper rotates for a period of time, when it is stationary relative to the calcining furnace under the action of the driving assembly, the hydraulic cylinder starts to push the scraper block to slide back and forth on the scraper, thereby removing the phosphogypsum stuck on the scraper.

[0014] Preferably, a storage groove is provided on the inner wall of the sealing cover, and the scraper block is slidably connected to the inner wall of the storage groove.

[0015] By adopting the above technical solution, when the scraper rotates relative to the calcining furnace, the scraper block is in the storage tank to avoid hindering the rotation of the scraper; in the process of the scraper block entering the storage tank from the scraper, the inner wall of the storage tank and the side wall of the scraper block slide relative to each other, so that the phosphogypsum sticking to the scraper block can be removed.

[0016] Preferably, an abutment plate is slidably disposed in the storage groove, the scraper block abuts against the abutment plate, a plurality of springs are disposed in the storage groove, and two ends of the springs are respectively fixedly connected to the abutment plate and the inner wall of the storage groove.

[0017] By adopting the above technical solution, when the scraper block is in the storage tank, the scraper block pushes the abutment plate to compress the spring. When the scraper block is away from the storage tank, the abutment plate moves under the push of the spring to be flush with the inner wall of the sealing plate, thereby reducing the possibility of phosphogypsum in the calcining furnace entering the storage tank.

[0018] Preferably, a guide groove is formed on the side wall of the scraper, and a guide block is fixedly connected to the scraper block, and the guide block slides in the guide groove.

[0019] By adopting the above technical solution, when the piston of the hydraulic cylinder pushes the scraper block to move, the guide block on the scraper block moves in the guide groove, thereby reducing the possibility of the scraper block tilting.

[0020] Preferably, the calcining furnace is connected to an exhaust pipe.

[0021] By adopting the above technical solution, smoke and toxic gases will be generated during the high-temperature calcination of phosphogypsum, and the gases will be separated from the calcining furnace through the exhaust pipe and enter the next process for treatment.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. During the calcination of phosphogypsum in the calcining furnace, the driving component drives the scraper to rotate in the calcining furnace. When the scraper rotates, one end of the scraper abuts against and slides on the inner wall of the calcining furnace, so that the phosphogypsum attached to the inner wall of the calcining furnace can be scraped off the inner wall of the calcining furnace, thereby reducing the incomplete calcination of the phosphogypsum and causing the decline in calcination quality. At the same time, it saves resources, avoids the waste of calcined gypsum attached to the inner wall, and improves production efficiency;

[0024] 2. The motor is installed on the insulation board to reduce the possibility of damage to the motor due to high temperature; after the motor is set to rotate at a certain frequency and speed, the motor will drive the rotating rod to rotate, and the rotating rod will drive the scraper to rotate;

[0025] 3. After the scraper has worked for a long time, the part that contacts the inner wall of the calcining furnace may be worn out, reducing the cleaning effect of the scraper. At this time, before the calcining furnace starts calcining, the staff can pull the scraper off the rotating rod, and then replace it with a new scraper. After aligning the limiting groove on the new scraper with the limiting block on the rotating rod, the scraper is pushed into the calcining furnace to complete the replacement of the scraper. When the rotating rod rotates, the scraper rotates together with the limit block. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the calcining furnace in the embodiment of the present application.

[0027] Figure 2 It is a cross-sectional view of the calcining furnace in the embodiment of the present application.

[0028] Figure 3 It is a structural schematic diagram of the protruding limit block in the embodiment of the present application.

[0029] Description of reference numerals:

[0030] 1. Calcination furnace; 2. Sealing cover; 3. Scraper; 4. Driving assembly; 5. Cleaning assembly; 41. Motor; 42. Rotating rod; 6. Insulation plate; 7. Limit block; 8. Limit groove; 51. Scraper; 52. Hydraulic cylinder; 9. Storage tank; 91. Abutment plate; 92. Spring; 10. Guide groove; 11. Guide block; 12. Exhaust pipe. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-3 This application is described in further detail.

[0032] The present application embodiment discloses a phosphogypsum calcining device, such as Figure 1 and Figure 2 As shown, combined with Figure 3 As shown, it includes a calcining furnace 1, and a sealing cover 2 is hinged at one end of the calcining furnace 1. When the sealing cover 2 is opened, materials can be filled into the calcining furnace 1. When the materials are calcined, the sealing cover 2 is closed to prevent internal smoke and gas leakage. A scraper 3 is rotatably arranged in the calcining furnace 1. The cross section of the scraper 3 is triangular. The bottom edge of the scraper 3 abuts and slides on the inner wall of the calcining furnace 1. A driving component 4 for driving the scraper 3 to rotate is arranged in the calcining furnace 1. A cleaning component 5 for cleaning the scraper 3 is arranged in the calcining furnace 1. The driving component 4 includes a motor 41 and a rotating rod 42. An insulation board 6 is fixedly welded at one end of the outer wall of the calcining furnace 1 away from the sealing cover 2. The insulation board 6 is in the shape of a rectangular parallelepiped. The motor 41 is fixedly installed on the upper end surface of the insulation board 6. The motor 41 is installed on the insulation board 6 to reduce the possibility of the motor 41 being damaged by high temperature. The rotating rod 42 is fixedly connected to the rotating shaft of the motor 41 through a coupling, the rotating rod 42 is inserted into the calcining furnace 1, and the scraper 3 is connected to the rotating rod 42. A limiting block 7 is fixedly welded on the side wall of the rotating rod 42 along its extension direction, and the limiting block 7 is in a rectangular parallelepiped shape. A limiting groove 8 for the limiting block 7 to be inserted is opened in the scraper 3 along its length extension direction.

[0033] like Figure 1 As shown, the calcining furnace 1 is connected to an exhaust pipe 12, which can be connected to a ventilation pipe to transport smoke and toxic gases generated during the high-temperature calcination of phosphogypsum to the next level for centralized treatment, thereby reducing the smoke and toxic gases generated during the calcination process from diffusing into the air and polluting the environment.

[0034] like Figure 1 and Figure 2As shown, during the calcination of phosphogypsum by the calcining furnace 1, the motor 41 is set to a suitable rotation frequency and speed before use. When the motor 41 starts to rotate rapidly, it will drive the rotating rod 42 to rotate, and the scraper 3 is driven to rotate relative to the calcining furnace 1 under the action of the limit block 7. When the scraper 3 rotates, its tip abuts and slides on the inner wall of the calcining furnace 1, and the side walls at both ends of the scraper 3 are slidably connected to the inner walls of the end faces at both ends of the calcining furnace 1, so that the phosphogypsum attached to the inner walls of the sides and the inner walls of the end faces of the calcining furnace 1 can be shoveled away from the inner walls of the calcining furnace 1, reducing the incomplete calcination of the phosphogypsum and causing the calcination quality to decline. At the same time, it saves resources, avoids the waste of calcined gypsum attached to the inner wall, and improves production efficiency. When the scraper 3 has been working for a long time, the part that contacts the inner wall of the calcining furnace 1 may be worn, reducing the cleaning effect of the scraper 3; at this time, before the calcining furnace 1 starts calcining, the staff can drag the scraper 3 to slide off the rotating rod 42, and then replace it with a new scraper 3. After aligning the limiting groove 8 on the new scraper 3 with the limiting block 7 on the rotating rod 42, the scraper 3 is pushed into the calcining furnace 1 to complete the replacement of the scraper 3.

[0035] like Figure 2 and Figure 3 As shown, the cleaning assembly 5 includes a scraper block 51 and a hydraulic cylinder 52. The scraper block 51 is slidably connected to the side wall of the scraper 3. The scraper block 51 is a triangular block, and its three inner walls slide on the three side walls of the scraper 3, so as to increase the cleaning effect of the scraper 3. The hydraulic cylinder 52 is fixedly installed on the outer wall of the sealing cover 2. The piston of the hydraulic cylinder 52 is penetrated through the sealing cover 2 and fixedly welded to the scraper block 51. The inner wall of the sealing cover 2 is provided with a storage groove 9, which is triangular in shape. The scraper block 51 is slidably connected to the inner wall of the storage groove 9. An abutment plate 91 is slidably arranged in the storage groove 9. The abutment plate 91 is triangular in shape. The three side walls of the abutment plate 91 slide on the three inner walls of the storage groove 9 respectively. The scraper block 51 abuts against the end face of the abutment plate 91. A plurality of springs 92 are arranged in the storage groove 9 along the horizontal direction. The two ends of the spring 92 are fixedly welded to the abutment plate 91 and the inner wall of the storage groove 9 respectively. Guide grooves 10 are respectively formed on both side walls of the scraper 3 along the length direction of the scraper 3 . Guide blocks 11 are fixedly welded on both side inner walls of the scraper block 51 , and the guide blocks 11 slide in the guide grooves 10 .

[0036] like Figure 2 and Figure 3As shown, after the scraper 3 rotates for a period of time, under the control of the motor 41, it is stationary relative to the calcining furnace 1, and the cross section is just aligned with the storage tank 9. At this time, the hydraulic cylinder 52 is started, and the piston of the hydraulic cylinder 52 pushes the scraper block 51 away from the storage tank 9, and slides back and forth on the scraper 3, thereby removing the phosphogypsum stuck on the scraper 3. When the scraper block 51 is away from the storage tank 9, the abutment plate 91 moves to be flush with the inner wall of the sealing plate under the push of the spring 92, thereby reducing the possibility of the phosphogypsum in the calcining furnace 1 entering the storage tank 9. When the scraper block 51 slides on the scraper 3, the guide block 11 moves in the guide groove 10, thereby reducing the intensity of the scraper block 51 tilting. After the scraper block 51 moves back and forth on the scraper 3 for several times, it enters the storage tank 9 under the drive of the hydraulic cylinder 52, and pushes the abutment plate 91 to compress the spring 92 to move. When the scraper block 51 enters the storage tank 9, the three side walls of the storage tank 9 will slide against the three side wall surfaces of the scraper block 51, so that the phosphogypsum stuck on the scraper block 51 can be removed from the storage tank 9. When the scraper block 51 is in the storage tank 9, the scraper block 51 can be prevented from hindering the movement of the scraper plate 3.

[0037] The implementation principle of the embodiment of the present application is as follows: during the process of calcining phosphogypsum by the calcining furnace 1, the scraper 3 rotates relative to the calcining furnace 1 under the drive of the motor 41, so that the bottom end of the scraper 3 slides on the inner wall of the circumference of the calcining furnace 1, and the side walls of the scraper 3 at both ends slide on the inner walls of the end faces at both ends of the calcining furnace 1, so that the phosphogypsum attached to the inner wall of the calcining furnace 1 can be cleaned; after the scraper 3 rotates for a period of time, it gradually slows down under the control of the motor 41, and finally stops relative to the calcining furnace 1, and its side wall is aligned with the storage groove 9 on the sealing cover 2, and then, the scraper block 51 is pushed by the piston of the hydraulic cylinder 52 to move out of the storage groove 9 and is engaged with the storage groove 9. On the scraper 3, the guide block 11 on the scraper block 51 is slidably connected to the inner wall of the guide groove 10 on the scraper 3, and the scraper block 51 is driven by the hydraulic cylinder 52 to slide back and forth along the length direction of the scraper 3, so as to clean the phosphogypsum stuck on the side wall of the scraper 3; the scraper block 51 finally slides into the storage tank 9 driven by the hydraulic cylinder 52, and the inner wall of the storage tank 9 removes the phosphogypsum stuck to the outer wall of the scraper block 51 out of the storage tank 9. When the scraper block 51 pushes the abutment plate 91 to compress the spring 92 completely in the storage tank 9, the scraper 3 rotates relative to the calcining furnace 1 again under the drive of the motor 41, and the next round of cleaning of the inner wall of the calcining furnace 1 is carried out.

[0038] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A phosphogypsum calcining device, comprising a calcining furnace (1), characterized in that: A sealing cover (2) is hingedly connected to one end of the calcining furnace (1); a scraper (3) is rotatably arranged inside the calcining furnace (1); the scraper (3) slides on the inner wall of the calcining furnace (1); a driving component (4) for driving the scraper (3) to rotate is arranged inside the calcining furnace (1); and a cleaning component (5) for cleaning the scraper (3) is arranged inside the calcining furnace (1).

2. A phosphogypsum calcining device according to claim 1, characterized in that: The driving assembly (4) comprises a motor (41) and a rotating rod (42); an end of the outer wall of the calcining furnace (1) away from the sealing cover (2) is fixedly connected to a thermal insulation plate (6); the motor (41) is fixedly mounted on the thermal insulation plate (6); the rotating rod (42) is fixedly connected to a rotating shaft of the motor (41); the rotating rod (42) is inserted into the calcining furnace (1); and the scraper (3) is connected to the rotating rod (42).

3. A phosphogypsum calcining device according to claim 2, characterized in that: A limit block (7) is fixedly connected to the rotating rod (42), and a limit groove (8) for the limit block (7) to be inserted is provided on the scraper (3).

4. The phosphogypsum calcining device according to claim 1, characterized in that: The cleaning assembly (5) comprises a scraper block (51) and a hydraulic cylinder (52); the scraper block (51) is slidably connected to the scraper plate (3); and the piston of the hydraulic cylinder (52) is inserted through the sealing cover (2) and fixedly connected to the scraper block (51).

5. A phosphogypsum calcining device according to claim 4, characterized in that: The inner wall of the sealing cover (2) is provided with a storage groove (9), and the scraper block (51) is slidably connected to the inner wall of the storage groove (9).

6. A phosphogypsum calcining device according to claim 5, characterized in that: An abutment plate (91) is slidably disposed in the storage groove (9), and the scraper block (51) abuts against the abutment plate (91). A plurality of springs (92) are disposed in the storage groove (9), and two ends of the springs (92) are respectively fixedly connected to the abutment plate (91) and the inner wall of the storage groove (9).

7. The phosphogypsum calcining device according to claim 4, characterized in that: A guide groove (10) is provided on the side wall of the scraper (3), and a guide block (11) is fixedly connected to the scraper block (51), and the guide block (11) slides in the guide groove (10).

8. The phosphogypsum calcining device according to claim 1, characterized in that: The calcining furnace (1) is connected to an exhaust pipe (12).

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