Phosphogypsum drying device

Abstract

The utility model relates to the technical field of ardealite treatment, and particularly discloses an ardealite drying device which comprises a heat insulation barrel, a rotatable centrifugal barrel is coaxially arranged in the heat insulation barrel, an interlayer is formed between the centrifugal barrel and the heat insulation barrel, a heating coil is arranged in the interlayer, and the ardealite drying device further comprises a driving mechanism for driving the centrifugal barrel to rotate. The technical problem that in the prior art, when powdery ardealite is dried in a heat convection mode, ardealite floats and easily flows out along with hot air is solved.

Description

Technical Field

[0001] This invention relates to the field of phosphogypsum treatment technology, specifically to a phosphogypsum drying device. Background Technology

[0002] Phosphogypsum refers to the solid waste residue generated during the treatment of phosphate rock with sulfuric acid in phosphoric acid production. Its main component is calcium sulfate (CaSO4). After recycling and processing, phosphogypsum has a wide range of applications in agriculture, construction, and environmental protection. For example, in agriculture, phosphogypsum is an important agricultural fertilizer that can improve soil and supplement nutrients. In the construction industry, phosphogypsum can be used in building materials such as gypsum board to reduce costs.

[0003] While phosphogypsum recycling has certain value, most phosphogypsum originates from waste products in the wet-process phosphoric acid production line and contains a large amount of water, which affects its storage and transportation. Drying effectively reduces the water content of phosphogypsum, making it easier to store and transport. Furthermore, the lower water content of dried phosphogypsum helps improve product quality and expands its applications. For example, in the construction industry, lower water content phosphogypsum can improve the strength and durability of gypsum board, and dried phosphogypsum can be used as a cement retarder and building material. This helps improve the resource utilization rate of phosphogypsum and reduce resource waste.

[0004] In existing technologies, most phosphogypsum drying equipment uses hot air convection drying, where hot air directly contacts the phosphogypsum. This method has high heat exchange efficiency for granular or agglomerated phosphogypsum, but for powdered phosphogypsum, due to its small mass and large specific surface area, it is similar to dust. The hot air convection drying method will agitate the phosphogypsum powder, causing it to float in the container and easily flow out with the hot air, resulting in waste of phosphogypsum and a direct reduction in phosphogypsum production. Furthermore, the phosphogypsum powder carried out can also cause dust pollution. Summary of the Invention

[0005] The purpose of this invention is to provide a phosphogypsum drying device to solve the technical problem mentioned above in the prior art where the phosphogypsum floats and easily flows out with the hot air when drying powdered phosphogypsum by heat convection.

[0006] To solve the above problems, the technical solution adopted by the present invention is as follows: a phosphogypsum drying device, including a heat-insulated barrel, a rotatable centrifugal barrel coaxially arranged inside the heat-insulated barrel, a sandwich layer formed between the centrifugal barrel and the heat-insulated barrel, a heating coil arranged in the sandwich layer, and a drive mechanism for driving the centrifugal barrel to rotate.

[0007] The beneficial effects of this implementation plan are as follows:

[0008] 1. In existing technologies, most phosphogypsum drying equipment uses hot air convection drying, where hot air directly contacts the phosphogypsum. For powdered phosphogypsum, due to its small mass and large specific surface area, its properties are similar to dust. Hot air convection drying will agitate the phosphogypsum powder, causing it to float in the container and easily flow out with the hot air, resulting in waste of phosphogypsum. Furthermore, the phosphogypsum powder carried out can also cause dust pollution. In contrast, this application designs an insulated tank and a centrifugal tank, forming a jacketed heating space between them. Centrifugal force is used to adhere the powdered phosphogypsum to the inner wall of the centrifugal tank, and the heat from the heating coil evaporates the moisture in the phosphogypsum powder, achieving the drying effect. After drying, the phosphogypsum powder adheres tightly to the inner wall of the centrifugal tank due to centrifugal force. Compared with existing technologies, this reduces the floating and loss of phosphogypsum and avoids phosphogypsum dust pollution, making it more environmentally friendly.

[0009] Furthermore, the driving mechanism includes a motor installed outside the heat-insulating barrel, a drive wheel on the output shaft of the motor, a key shaft connected to the bottom of the centrifuge barrel, a driven wheel fixedly connected to the key shaft, and a transmission belt sleeved between the driven wheel and the drive wheel.

[0010] Furthermore, the heat insulation barrel is provided with a support plate that divides the heat insulation barrel into upper and lower cavities. The support plate includes a circular part and a handle part. A bearing seat is provided at the center of the circular part. A connecting shaft is fixedly connected to the key shaft. The connecting shaft is installed in the bearing seat. The connecting shaft passes downward through the support plate and is fixedly connected to the driven wheel. The motor is vertically installed on the handle part. The motor output shaft also passes through the support plate and is fixedly connected to the drive wheel.

[0011] Furthermore, the bottom of the centrifuge chamber is provided with a conical protrusion that disperses the powder in all directions. The conical protrusion in the central area causes the powder poured into the centrifuge chamber to automatically disperse, allowing the powder to move more quickly towards the chamber wall during centrifuge rotation, preventing it from accumulating in the central area.

[0012] Furthermore, the bearing housing is externally fitted with a ring seat fixedly mounted on the support plate, and the top surface of the ring seat is provided with several support wheels to support the centrifuge tank. The bottom of the centrifuge tank is fixedly installed with support wheels arranged in a circular array, which are in contact with the top surface of the ring seat, thereby providing stable support for the bottom of the centrifuge tank and supporting its rotation. The support wheels are used to reduce friction and ensure the stability of the centrifuge tank when rotating.

[0013] Furthermore, a lid is hinged to the top of the insulated barrel, and a shroud is fixedly installed on the top of the lid. The shroud is connected to a duct that connects to an external heat recovery system. By guiding water vapor to the external heat recovery system through the shroud and duct, the heat energy in the water vapor is recovered and utilized. This design not only reduces energy waste but also reduces thermal pollution to the environment, conforming to the concept of energy conservation and environmental protection. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a phosphogypsum drying device.

[0015] Figure 2 This is a schematic diagram of the internal structure of an insulated barrel in a phosphogypsum drying device.

[0016] Figure 3 This is a schematic diagram of a phosphogypsum drying device with a side section cutoff. Detailed Implementation

[0017] The following detailed description illustrates the specific implementation method:

[0018] The reference numerals in the accompanying drawings include: 1. Insulated tank; 11. Tank lid; 12. Radiator; 13. Air pipe; 14. Support plate; 2. Centrifuge tank; 21. Lifting lug; 22. Handle; 23. Positioning groove; 24. Conical protrusion; 3. Drive mechanism; 31. Key shaft; 32. Connecting shaft; 33. Driven wheel; 34. Transmission belt; 35. Drive wheel; 36. Motor; 37. Bearing seat; 4. Heating coil; 5. Ring seat; 6. Support wheel.

[0019] Example 1

[0020] like Figures 1-2 As shown, the phosphogypsum drying device provided in this embodiment includes an insulated barrel 1, a support plate 14 horizontally arranged in the lower inner cavity of the insulated barrel 1, the support plate 14 dividing the insulated barrel into upper and lower cavities, the support plate 14 including a circular part and a protruding straight plate part, the two parts being a single piece of plate, the plane of which is similar to a ping-pong paddle; an annular groove is opened on the inner wall of the insulated barrel 1, the thickness of the annular groove being the same as that of the support plate 14, the circular part of the support plate 14 can be just inserted into the annular groove, and after being inserted, it is welded to the inner wall of the insulated barrel 1, the handle part of the support plate 14 extends through the side wall of the insulated barrel 1 to the outside of the insulated barrel 1. The insulated container 1 houses a centrifuge container 2. The walls of the centrifuge container 2 are made of stainless steel. The outer diameter of the centrifuge container 2 is smaller than the inner diameter of the insulated container 1, creating a space between them to form a jacket structure. A heating coil 4 surrounds the centrifuge container 2 within the jacket, but a gap is left between the heating coil 4 and the centrifuge container to allow for rotation. The heating coil 4 is made of copper and is supported by its own strength. Both the centrifuge container 2 and the insulated container 1 are cylindrical structures with their vertical central axes coinciding. The length of the centrifuge container 2 is shorter than that of the insulated container 1. Therefore, when the centrifuge container 2 is installed on the support plate 14, the upper surfaces of the insulated container 1 and the centrifuge container 2 are preferably aligned at the same height. Thus, the centrifuge container 2 is located inside the insulated container 1, and the support plate 14 provides support for the centrifuge container 2.

[0021] This phosphogypsum drying apparatus also includes a drive mechanism 3 for the centrifuge tank 2. The drive mechanism 3 includes a motor 36 mounted outside the insulated tank 1. The motor 36 is vertically mounted on the handle portion of the support plate 14 using bolts, and is supported by the support plate 14. The output shaft of the motor 36 passes downward through the support plate 14 and is connected to the drive wheel 35 with a key.

[0022] A through hole is provided at the center of the circular portion of the support plate 14. A bearing seat 37 is bolted to the through hole, and a coupling 32 is mounted at the center of the bearing seat 37. Therefore, the coupling 32 passes through the support plate 14 and can rotate relative to it. A driven wheel 33 is keyed to the lower end of the coupling 32. A transmission belt 34 is sleeved between the driven wheel 33 and the drive wheel 35, so the drive wheel 35 can drive the driven wheel 33 to rotate using the transmission belt 34.

[0023] The centrifuge tank 2 has a positioning groove 23 at the center of the bottom panel. A key shaft 31 is inserted into the positioning groove 23. A connecting shaft 32 passes through the upper end of the support plate 14 and is fixedly connected to the key shaft 31 with bolts.

[0024] The bearing housing 37 is externally fitted with a ring seat 5 fixedly mounted on the support plate 14. At least three sets of support wheels 6, arranged in a ring array, are fixedly installed at the bottom of the centrifuge tank 2 and contact the top surface of the ring seat 5. By providing support for the ring seat 5 at the bottom of the centrifuge tank 2 and using the support wheels 6 to reduce friction, the stability of the centrifuge tank 2 during rotation is ensured.

[0025] The centrifuge barrel 2 has at least three lifting lugs 21 arranged in a circular array along its opening edge. A handle 22 is symmetrically fixed to the opening edge of the centrifuge barrel 2. The central area of ​​the bottom surface inside the centrifuge barrel 2 has a conical protrusion 24 for dispersing the powder in all directions. A support arm is welded to the outer circumference of the top of the insulated barrel 1. A barrel cover 11 is hinged to the support arm, completely covering the opening on the upper surface of the insulated barrel 1. An opening is located at the center of the top of the barrel cover 11, and a shunting shield 12 is welded to the upper end of the opening. The shunting shield 12 is connected to an external heat recovery system via a gas pipe 13. Detailed Implementation

[0027] During operation, phosphogypsum powder is added to centrifuge drum 2. Motor 36 starts, driving drive wheel 35 to rotate. This drives driven wheel 33 via transmission belt 34, which in turn drives centrifuge drum 2 via coupling shaft 32 and key shaft 31. Simultaneously, heating coil 4 heats centrifuge drum 2, transferring heat to the phosphogypsum powder inside. Under the combined action of centrifugal force and heat, the moisture in the phosphogypsum powder evaporates, achieving a drying effect. The dried phosphogypsum powder adheres tightly to the inner wall of centrifuge drum 2 due to centrifugal force, reducing the possibility of floating and loss during convection drying. During the drying of phosphogypsum powder, a rectifier 12 is fixedly installed at the opening position on the top of the drum lid 11. The shape and position design of the rectifier 12 allow water vapor discharged from the insulated drum to concentrate and flow in a specific direction, reducing water vapor diffusion and turbulence. The rectifier and air pipe guide the water vapor to an external heat recovery system, realizing the recovery and utilization of heat energy in the water vapor. This design not only reduces energy waste but also lowers thermal pollution to the environment, conforming to the concept of energy conservation and environmental protection.

[0028] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A phosphogypsum drying apparatus, characterized in that: It includes an insulated barrel, a rotatable centrifugal barrel coaxially arranged inside the insulated barrel, a sandwich layer formed between the centrifugal barrel and the insulated barrel, a heating coil arranged in the sandwich layer, and a drive mechanism for driving the centrifugal barrel to rotate.

2. The phosphogypsum drying apparatus according to claim 1, characterized in that: The driving mechanism includes a motor mounted outside the heat-insulating barrel, a drive wheel on the output shaft of the motor, a key shaft connected to the bottom of the centrifuge barrel, a driven wheel fixedly connected to the key shaft, and a transmission belt sleeved between the driven wheel and the drive wheel.

3. The phosphogypsum drying apparatus according to claim 2, characterized in that: The heat insulation barrel is provided with a support plate that divides the heat insulation barrel into upper and lower cavities. The support plate includes a circular part and a handle part. A bearing seat is provided at the center of the circular part. A connecting shaft is fixedly connected to the key shaft. The connecting shaft is installed in the bearing seat. The connecting shaft passes downward through the support plate and is fixedly connected to the driven wheel. The motor is vertically installed on the handle part. The motor output shaft also passes through the support plate and is fixedly connected to the drive wheel.

4. The phosphogypsum drying apparatus according to claim 3, characterized in that: The bottom of the centrifuge chamber is provided with a conical protrusion that disperses the powder in all directions.

5. The phosphogypsum drying apparatus according to claim 3, characterized in that: The bearing housing is fitted with a ring seat that is fixedly installed on the support plate. The top surface of the ring seat is provided with several support wheels to support the centrifuge tank.

6. The phosphogypsum drying apparatus according to claim 3, characterized in that: The top of the heat insulation barrel is hinged with a barrel cover, and a rectifier is fixedly installed on the top of the barrel cover. The rectifier is connected to a gas pipe that connects to an external heat recovery system.

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