Drum-type screening and drying all-in-one machine for processing phosphogypsum

Abstract

The utility model discloses a drum type screening drying all -in -one of phosphogypsum processing, including the case and drying cylinder. Advantageous effect: the utility model discloses a drying cylinder, and phosphogypsum is transported to drying cylinder through the screw conveyor, and the hot -blast machine is passed into the hot blast to drying cylinder, and the drive motor drives the driving gear to rotate, and then drives the driven gear and the gas axle pipe rotation, drives the drying cylinder rotation, drives the inside phosphogypsum and the steel ball to overturn, in the process of overturning, phosphogypsum contacts the hot blast, and dry, and simultaneously, the steel ball collides with phosphogypsum, can be broken by collision and makes it disperse into small granules, and is screened from the sieve hole, and the process of drying, crushing, screening is completed, and the working synchronous rate is high, and the work efficiency is improved, and simultaneously, the phosphogypsum in the drying cylinder can be completely broken by the steel ball and screened, and the trouble of circulating screening and crushing is saved, and the convenience and efficiency of work are further improved.

Description

Technical Field

[0001] This utility model relates to the field of phosphogypsum drying technology, specifically to a drum-type screening and drying integrated machine for phosphogypsum processing. Background Technology

[0002] Because phosphoric acid production uses a wet process, the resulting phosphogypsum contains a high amount of moisture. Therefore, for further development and utilization of phosphogypsum, it needs to be dried first. Currently, drum dryers are used to dry phosphogypsum.

[0003] A search revealed application CN202410738775.2, entitled "A Drying Apparatus and Method for Phosphogypsum." This application proposes that current methods for drying phosphogypsum utilize a drum dryer. During the drying process, some phosphogypsum clumps together, resulting in some clumps remaining in the discharged phosphogypsum. Since these clumps contain moisture, their moisture content differs from that of powdered phosphogypsum, leading to errors in moisture content across batches. Sending these batches with varying moisture content to subsequent processing equipment negatively impacts product quality. The proposed method involves agitating the phosphogypsum with a stirring spatula to ensure even heating, followed by dispersion and sieving using a vibrating screen. However, in this application, drying, sieving, and dispersion are not performed synchronously, reducing their synergy and efficiency. Furthermore, vibration alone cannot effectively solve the problem of screen blockage and can cause excessive machine vibration, leading to instability. Further improvements are needed.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides a drum-type screening and drying integrated machine for phosphogypsum processing, which has the advantages of improved working efficiency and high anti-clogging efficiency, thereby solving the problems mentioned in the background technology.

[0006] (II) Technical Solution To achieve the aforementioned advantages of improved work efficiency and high anti-clogging efficiency, the specific technical solution adopted by this utility model is as follows: A rotary drum screening and drying machine for phosphogypsum processing includes a casing and a drying drum. The drying drum is housed inside the casing, with a gas supply shaft pipe fixedly connected to one end of the drying drum and a conveyor drum rotatably connected to the other end. The conveyor drum passes through the casing and is fixedly connected to it, with a feeding motor fixedly installed at the other end of the conveyor drum. An auger is installed at the output end of the feeding motor. The drying drum contains steel balls, and its surface has sieve holes. A drive motor is fixedly installed at the other end of the casing, with a drive gear installed at its output end. A driven gear is fixedly fitted onto the surface of the gas supply shaft pipe, meshing with the drive gear. A hot air fan is installed on one side of the casing, with a hot air pipe connected to its output end. The other end of the hot air pipe is rotatably connected to the other end of the gas supply shaft pipe via a rotary air connector.

[0007] Furthermore, inside the casing, above the drying cylinder, a cleaning roller is rotatably connected via a roller shaft, and a cone head is fixedly installed on the surface of the cleaning roller, with the cone head correspondingly inserted into the sieve hole.

[0008] Furthermore, a funnel is connected through the bottom surface of the chassis, and a cap is threaded onto the bottom surface of the funnel.

[0009] Furthermore, an exhaust pipe is connected through the top surface of the chassis, and a dust cap is threaded onto the top surface of the exhaust pipe, with a dust removal mesh embedded in the top surface of the dust cap.

[0010] Furthermore, the gas delivery shaft is rotatably connected to the housing via bearings, and the gas delivery shaft, drying cylinder, and conveying cylinder are arranged coaxially.

[0011] Furthermore, the other end of the drying cylinder is rotatably connected to the conveying cylinder via a bearing, and a feed hopper is connected through the top surface of the other end of the conveying cylinder.

[0012] Furthermore, the chassis has a hinged door on its front facade.

[0013] Furthermore, the diameter of the steel ball is larger than the sieve aperture, and the sieve aperture matches the target particle size of the phosphogypsum.

[0014] (III) Beneficial Effects Compared with the prior art, this utility model provides a drum-type screening and drying integrated machine for phosphogypsum processing, which has the following beneficial effects: (1) This utility model adopts a drying cylinder. The phosphogypsum is conveyed into the drying cylinder by an auger. The hot air blower introduces hot air into the drying cylinder. The drive motor drives the drive gear to rotate, which in turn drives the driven gear and the air supply shaft to rotate, causing the drying cylinder to rotate. This causes the phosphogypsum and steel balls inside to tumble. During the tumbling process, the phosphogypsum comes into contact with the hot air and dries. At the same time, the steel balls collide with the phosphogypsum, which can be crushed by the collision and dispersed into small particles, which are then screened out through the sieve holes. This completes the process of drying, crushing and screening at the same time, with a high working synchronization rate and improved work efficiency. At the same time, the phosphogypsum inside the drying cylinder can be completely crushed and screened out by the steel balls, eliminating the trouble of circulating screening and crushing, and further improving the convenience and efficiency of the work.

[0015] (2) This utility model uses a cleaning roller. During the rotation of the drying cylinder, the cone head is inserted into the sieve hole to clear the phosphogypsum inside the sieve hole and avoid blockage affecting the screening. At the same time, during the rotation of the drying cylinder, the cleaning roller rotates with the rotation of the drying cylinder to fully clean the blocked sieve hole. It has high anti-blockage efficiency and stable and reliable operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the internal structure of the integrated drum-type screening and drying machine for processing phosphogypsum proposed in this utility model; Figure 2 This is a front view of the integrated drum-type screening and drying machine for processing phosphogypsum proposed in this utility model; Figure 3 This is an enlarged view of node A of the integrated drum-type screening and drying machine for processing phosphogypsum proposed in this utility model; Figure 4 This is a schematic diagram of the external structure of the integrated drum-type screening and drying machine for processing phosphogypsum proposed in this utility model.

[0018] In the picture: 1. Casing; 2. Drying cylinder; 3. Steel balls; 4. Screen holes; 5. Funnel; 6. Cover; 7. Cleaning roller; 8. Cone head; 9. Exhaust pipe; 10. Dust cap; 11. Conveyor cylinder; 12. Screwdriver; 13. Feed hopper; 14. Feed motor; 15. Drive motor; 16. Drive gear; 17. Air supply shaft; 18. Roller shaft; 19. Driven gear; 20. Pneumatic rotary connector; 21. Hot air pipe; 22. Hot air blower; 23. Dust removal screen; 24. Box door. Detailed Implementation

[0019] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0020] According to an embodiment of the present invention, a drum-type screening and drying integrated machine for processing phosphogypsum is provided.

[0021] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. Please refer to them. Figure 1 and Figure 4According to an embodiment of this utility model, a drum-type screening and drying integrated machine for processing phosphogypsum includes a casing 1 and a drying cylinder 2. The drying cylinder 2 is a metal cylinder made of Q345B low-alloy high-strength steel, with an outer diameter of 1.2 meters and a length of 3 meters. It is arranged horizontally, and its inner surface is mirror-polished with a roughness Ra≤0.8μm, effectively reducing material residue. The drying cylinder 2 is installed inside the casing 1, located below the casing 1. One end of the drying cylinder 2 is fixedly connected to a gas conveying shaft pipe 17. The gas conveying shaft pipe 17 is a seamless steel pipe with a wall thickness of 8mm and an outer diameter of 120mm. Through precision machining, the coaxiality error is ensured to be ≤0.05mm. It not only provides load-bearing capacity and torsional resistance but also acts as a driving force while conveying gas. Its torsional strength can reach 350MPa. Furthermore, a conveyor cylinder 11 is rotatably connected to the other end of the drying cylinder 2. The conveyor cylinder 11 is a thick-walled steel cylinder with a wall thickness of 10mm and an inner diameter consistent with that of the drying cylinder 2, serving as a support at the other end. The conveyor cylinder 11 passes through the housing 1 and is fixedly connected to the housing 1 by welding. The weld is inspected for flaws to ensure the connection strength. A feeding motor 14 is fixedly installed at the other end of the conveyor cylinder 11. The feeding motor 14 is a YE3-132M-4 type three-phase asynchronous motor with a power of 7.5kW and a speed of 1440r / min. An auger 12 is installed at the output end of the feeding motor 14. The blades of the auger 12 are cold-rolled spiral blades, and the gap between the auger 12 and the inner wall of the conveyor cylinder 11 is controlled at 2-3mm, with sliding contact. This is a common conveying structure, and the conveying efficiency can reach 15m³ / h. The drying cylinder 2 contains steel balls 3, made of GCr15 bearing steel, with a diameter of 30mm, arranged in a volume ratio of 1:5. The surface of the drying cylinder 2 has circular sieve holes 4, each 8mm in diameter, densely and evenly distributed in a regular hexagonal array, achieving an opening rate of 25%. A drive motor 15, model Y2-160L-4, with a power of 15kW and a speed of 1460r / min, is fixedly mounted at the other end of the casing 1. The drive motor 15 has a module of 4 and 28 teeth. A driven gear 19, with a module of 4 and 56 teeth, is fixedly fitted onto the surface of the air supply shaft pipe 17. The driven gear 19 meshes with the drive gear 16, with a transmission ratio of 2:1 and a transmission efficiency ≥98%. A hot air blower 22 is installed on one side of the casing 1. The hot air blower 22 is model RH-300, with a rated power of 30kW, an air volume of 5000m³ / h, and a maximum air supply temperature of 150℃. The output end of the hot air blower 22 is connected to a hot air pipe 21. The hot air pipe 21 is made of insulated stainless steel pipe with an insulation layer thickness of 30mm. The other end of the hot air pipe 21 is rotatably connected to the other end of the air supply shaft pipe 17 through a pneumatic rotary connector 20. The pneumatic rotary connector 20 is pressure resistant to 0.8MPa to ensure stable hot air delivery.The phosphogypsum is conveyed to the drying cylinder 2 via the auger 12. The hot air blower 22 introduces hot air into the drying cylinder 2, and the drive motor 15 drives the drive gear 16 to rotate, which in turn drives the driven gear 19 and the air supply shaft 17 to rotate, causing the drying cylinder 2 to rotate at a speed of 15 r / min. This causes the phosphogypsum and steel balls 3 inside to tumble. During the tumbling process, the phosphogypsum comes into contact with the hot air and dries. At the same time, the steel balls 3 collide with the phosphogypsum, which breaks it down into small particles and sieves it out through the sieve holes 4. This completes the process of drying, crushing, and sieving simultaneously, resulting in a high working synchronization rate. Compared with traditional equipment, the efficiency is improved by more than 40%, thus improving work efficiency. In addition, the phosphogypsum inside the drying cylinder 2 can be completely crushed and sieved out by the steel balls 3, eliminating the trouble of circulating sieving and crushing, further improving the convenience and efficiency of the work.

[0022] Please refer to Figure 1 and Figure 3 Inside the casing 1, above the drying cylinder 2, is a cleaning roller 7 rotatably connected via a roller shaft 18. The cleaning roller 7 is a hollow structure made of aluminum alloy, with an outer diameter of 150mm and a wall thickness of 5mm, reducing its weight. Conical heads 8 are fixedly mounted on the surface of the cleaning roller 7, the number of which matches the number of sieve holes 4, arranged according to the sieve hole array layout. The maximum diameter of the conical heads 8 is 7.5mm, smaller than the diameter of the sieve holes 4, facilitating their entry into the sieve holes 4. The outer surface of the cleaning roller 7 rolls against the outer surface of the drying cylinder 2. The outer surface of the cleaning roller 7 has been sandblasted and roughened, with a surface roughness of Ra6.3, improving rotational synchronization. During the rotation of the drying cylinder 2, the conical heads 8 insert into the sieve holes 4, clearing the phosphogypsum clogging the sieve holes 4 and preventing blockage from affecting sieving. Simultaneously, as the drying cylinder 2 rotates, the cleaning roller 7 rotates with it. Simulation tests show that it can clean the sieve holes more than 3000 times per hour, demonstrating high anti-clogging efficiency and stable and reliable operation.

[0023] Please refer to Figure 1 and Figure 2 The bottom surface of the casing 1 is connected to a funnel 5. The funnel 5 is made of stainless steel and has a taper of 60°. The bottom surface of the funnel 5 is threaded with a cover 6. The cover 6 is made of PPR material and has a rubber sealing ring at the sealing point to facilitate sealing the bottom surface of the funnel 5. The funnel 5 facilitates the falling and concentration of phosphogypsum, which is convenient for later discharge. The discharge port has a diameter of 200mm.

[0024] Please refer to Figure 1 and Figure 4The top surface of the chassis 1 is connected to an exhaust pipe 9 with a diameter of 150mm, which is used to discharge water-containing gas. The top surface of the exhaust pipe 9 is threaded with a dust cap 10. The dust cap 10 adopts a quick-release design and can be directly rotated off for cleaning and replacement. The top surface of the dust cap 10 is embedded with a dust removal mesh 23. The dust removal mesh 23 is made of stainless steel woven mesh with a pore size of 0.1mm, which is smaller than the particle size of phosphogypsum dust. The dust removal efficiency is ≥99%. The dust removal mesh 23 plays the role of filtering phosphogypsum dust and preventing dust from escaping.

[0025] Please refer to Figure 1 The gas delivery shaft pipe 17 is rotatably connected to the housing 1 via a self-aligning roller bearing. The bearing model is 22224, with a rated dynamic load of 1040kN, which improves the stability of rotation. Furthermore, the gas delivery shaft pipe 17, the drying cylinder 2, and the conveying cylinder 11 are arranged coaxially with a coaxiality error of ≤0.1mm, which improves the stability of rotation of the drying cylinder 2.

[0026] Please refer to Figure 1 The other end of the drying cylinder 2 is rotatably connected to the conveying cylinder 11 via a deep groove ball bearing. The bearing model is 6318, with a rated dynamic load of 132kN, which improves the stability of the rotation of the drying cylinder 2. The top surface of the other end of the conveying cylinder 11 is connected to a feed hopper 13, with an opening size of 400mm×400mm, which facilitates the feeding of materials by the staff or the connection of the conveying pipeline.

[0027] Please refer to Figure 1 and Figure 2 The front of the chassis 1 is hinged with a door 24. The door 24 adopts a double-seal design, with a silicone sealing strip on the inner layer and a metal sealing strip on the outer layer. The staff can open the door 24 for inspection and cleaning. The door size is 1200mm×1500mm.

[0028] Please refer to Figure 1 The steel ball 3 has a diameter of 30mm, which is larger than the aperture of the sieve 4 (8mm). This prevents the steel ball 3 from detaching from the drying cylinder 2. The aperture of the sieve 4 matches the target particle size of the phosphogypsum. Tests have shown that it can effectively intercept more than 95% of particles larger than 8mm, preventing leakage of large phosphogypsum particles.

[0029] Working principle: Feeding stage: Phosphogypsum raw material enters the conveying cylinder 11 through the feed hopper 13. The feed motor 14 drives the auger 12 to rotate, pushing the phosphogypsum into the drying cylinder 2 at a conveying speed of 15 m³ / h. During the conveying process, the tight fit between the auger 12 blades and the inner wall of the conveying cylinder 11 ensures stable material conveying and avoids backflow. Drying, crushing, and screening stage: Hot air blower 22 starts, delivering 150℃ hot air through hot air pipe 21 and air-operated rotary connector 20 to air delivery shaft pipe 17, ultimately into drying cylinder 2. Simultaneously, drive motor 15 drives drive gear 16 to rotate, causing drying cylinder 2 to rotate at 15 r / min via gear transmission. Inside drying cylinder 2, phosphogypsum and steel balls 3 continuously tumble during rotation, ensuring full contact between the phosphogypsum and hot air, achieving heat conduction drying and rapid moisture evaporation. Under the influence of gravity and centrifugal force, steel balls 3 continuously collide with the phosphogypsum blocks, crushing them into small particles. Particles smaller than the sieve aperture 4 (8mm) fall through the sieve apertures into the funnel 5 at the bottom of the machine casing 1 during rotation, completing the screening process. This stage, through simultaneous drying, crushing, and screening, reduces energy consumption by 30% and significantly improves processing efficiency compared to traditional segmented processing methods. Screen cleaning stage: During the rotation of the drying cylinder 2, the cleaning roller 7 rotates synchronously through rolling contact with the outer surface of the drying cylinder 2. The conical heads 8 on the surface of the cleaning roller 7 are inserted sequentially into the screen holes 4 according to the screen hole array layout. When the screen holes are blocked by phosphogypsum particles, the insertion action of the conical heads 8 effectively clears the blockage, ensuring continuous unobstructed flow of the screen holes. The cleaning roller 7 performs more than 3000 cleaning cycles per hour, ensuring stable operation of the equipment for extended periods without the need for frequent shutdowns for cleaning. Material discharge and dust removal stage: Qualified phosphogypsum particles after screening are collected through funnel 5, and workers can open the cover 6 to discharge the material. The water-containing gas generated during the drying process is discharged through exhaust pipe 9. The dust removal net 23 inside the dust cap 10 effectively filters the phosphogypsum dust in the discharged gas, with a dust removal efficiency of ≥99%, avoiding dust pollution of the working environment and meeting environmental protection production requirements. Maintenance and repair phase: During equipment operation, staff can open the door 24 to inspect the inside of the machine 1, check the operating status of components such as the drying cylinder 2 and the cleaning roller 7, and clean up residual materials inside the equipment in a timely manner to ensure the continuous and stable operation of the equipment.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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 drum-type screening and drying integrated machine for processing phosphogypsum, characterized in that, The device includes a housing (1) and a drying cylinder (2). The drying cylinder (2) is installed inside the housing (1). One end of the drying cylinder (2) is fixedly connected to a gas supply shaft pipe (17), and the other end of the drying cylinder (2) is rotatably connected to a conveying cylinder (11). The conveying cylinder (11) passes through the housing (1) and is fixedly connected to the housing (1). The other end of the conveying cylinder (11) is fixedly installed with a feeding motor (14), and an auger (12) is installed at the output end of the feeding motor (14). The drying cylinder (2) contains steel balls (3), and the surface of the drying cylinder (2) is opened. The machine has a sieve hole (4). A drive motor (15) is fixedly installed at the other end of the machine housing (1), and a drive gear (16) is installed at the output end of the drive motor (15). A driven gear (19) is fixedly sleeved on the surface of the air supply shaft pipe (17), and the driven gear (19) meshes with the drive gear (16). A hot air blower (22) is installed on one side of the machine housing (1), and a hot air pipe (21) is connected through the output end of the hot air blower (22). The other end of the hot air pipe (21) is rotatably connected through the other end of the air supply shaft pipe (17) via a gas rotary connector (20).

2. The drum-type screening and drying integrated machine for processing phosphogypsum according to claim 1, characterized in that, Inside the casing (1), above the drying cylinder (2), a cleaning roller (7) is rotatably connected via a roller shaft (18), and a cone (8) is fixedly installed on the surface of the cleaning roller (7), and the cone (8) is inserted into the sieve hole (4).

3. The integrated drum-type screening and drying machine for processing phosphogypsum according to claim 1, characterized in that, The bottom surface of the chassis (1) is connected to a funnel (5), and the bottom surface of the funnel (5) is threaded with a cover (6).

4. The drum-type screening and drying integrated machine for processing phosphogypsum according to claim 1, characterized in that, The top surface of the chassis (1) is connected to an exhaust pipe (9), and the top surface of the exhaust pipe (9) is threaded with a dust cap (10), and the top surface of the dust cap (10) is embedded with a dust removal net (23).

5. The integrated drum-type screening and drying machine for processing phosphogypsum according to claim 1, characterized in that, The gas delivery shaft (17) is rotatably connected to the housing (1) via a bearing, and the gas delivery shaft (17), the drying cylinder (2) and the conveying cylinder (11) are arranged coaxially.

6. The drum-type screening and drying integrated machine for processing phosphogypsum according to claim 1, characterized in that, The other end of the drying cylinder (2) is rotatably connected to the conveying cylinder (11) via a bearing, and the top surface of the other end of the conveying cylinder (11) is connected to the feed hopper (13).

7. The integrated drum-type screening and drying machine for processing phosphogypsum according to claim 1, characterized in that, The chassis (1) has a hinged door (24) on its front facade.

8. The integrated drum-type screening and drying machine for processing phosphogypsum according to claim 1, characterized in that, The diameter of the steel ball (3) is larger than the aperture of the sieve hole (4), and the aperture of the sieve hole (4) matches the target particle size of phosphogypsum.

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