A cyclone separation type washing device for phosphogypsum

Abstract

The utility model relates to a cyclone separation type washing phosphogypsum device belongs to phosphogypsum processing technical field. Mainly include feed hopper, clean water injection subassembly, washing stirring device, overflow pipeline, sedimentation tank, cyclone separation device and discharge device, the cooperation of high pressure clean water injection subassembly and multistage blade stirring axle has realized the full mixing of phosphogypsum slurry and clean water, has improved washing efficiency, through the centrifugal separation principle of cyclone separation device, fastly completes solid -liquid separation, has overcome the problem of traditional gravity settling velocity slow, through the secondary settlement and backwater circulation system of sedimentation tank, has realized the repeated use of water resources, has reduced water consumption.

Description

Technical Field

[0001] This utility model belongs to the field of phosphogypsum processing technology, specifically relating to a cyclone separation type water washing device for phosphogypsum. Background Technology

[0002] Phosphogypsum is a major byproduct of wet-process phosphoric acid production, with a huge annual output. Its resource utilization is of great significance to environmental protection and economic development. However, raw phosphogypsum usually contains free phosphorus, soluble phosphates, fluorides, organic impurities, and some heavy metals. These impurities not only affect its physicochemical properties but also limit its application in building materials, agriculture, and other fields.

[0003] For the purification of phosphogypsum, water washing is widely used due to its simplicity, low cost, and ease of large-scale implementation. Rinsing with clean water effectively removes soluble impurities from phosphogypsum, thereby improving its purity. However, traditional water washing methods often rely on stirred tanks or settling tanks, resulting in low washing efficiency, high water consumption, and incomplete impurity removal. Furthermore, the solid-liquid separation process typically relies on gravity settling, leading to slow processing speeds and limiting the overall processing capacity. Utility Model Content

[0004] To address the problems of low washing efficiency, high water consumption, incomplete impurity removal, and slow solid-liquid separation in existing phosphogypsum washing technologies, this invention provides a cyclone separation type phosphogypsum washing device. This device, through the introduction of a clean water injection component, a washing and stirring device, a cyclone separation device, and a discharge device, achieves efficient washing and rapid solid-liquid separation of phosphogypsum slurry, while reducing water waste and improving impurity removal efficiency.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: A cyclone separation type water washing phosphogypsum device mainly includes a feed hopper, a clean water injection component, a water washing and stirring device, an overflow pipe, a settling tank, a cyclone separator, and a discharge device. The feed hopper is installed at the top of the water washing and stirring device to introduce the phosphogypsum slurry containing impurities into the device; the clean water injection component is located on one side of the water washing and stirring device and connected to it through a pipe to facilitate the introduction of washing water into the water washing and stirring device; the cyclone separator is installed on one side of the water washing and stirring device, and the two are connected through a slurry pump and a pipe. The cyclone separator adopts a conical shell structure and has cyclone guide vanes inside for cyclone separation of the mixed slurry; the discharge device is installed below the cyclone separator for conveying the dehydrated phosphogypsum particles; the settling tank is installed on one side of the cyclone separator, with the top of the overflow pipe connected to the cyclone separator and the bottom connected to the settling tank for discharging the separated supernatant and light impurities; the settling tank further settles impurities and recovers some phosphogypsum particles. The clean water injection assembly includes a high-pressure water source, nozzles, and a flow control valve. The high-pressure water source is connected to the washing and agitating device via a pipeline. The nozzles are installed inside the washing and agitating device and connected to the pipeline. The flow control valve is installed on the pipeline to facilitate adjustment of the water flow rate for precise washing water supply. After the high-pressure water source is delivered to the nozzles through the pipeline, the nozzles disperse the water flow into fine water columns, evenly covering the phosphogypsum slurry and enhancing the washing effect. The aforementioned water washing and mixing device includes a vertical mixing drum, a multi-stage blade mixing shaft, and a motor. The vertical mixing drum has a cylindrical structure with a hollow interior to hold the phosphogypsum slurry and water. The multi-stage blade mixing shaft is installed inside the vertical mixing drum, and the motor is mounted on top of the drum, with the multi-stage blade mixing shaft and motor connected for transmission. The multi-stage blade mixing shaft consists of multiple mixing blades, ensuring thorough contact and uniform mixing of the phosphogypsum slurry and water, thereby effectively removing soluble impurities. The cyclone separator includes a conical shell, a tangential inlet, and cyclone guide vanes. A tangential inlet is located at the top of the conical shell, through which the slurry enters at high speed. The cyclone guide vanes are installed inside the conical shell in a spiral pattern. Under centrifugal force, heavy phosphogypsum particles sink along the inner wall of the conical shell and are discharged from the bottom outlet. Lighter impurities and some water rise with the cyclone and enter the overflow pipe through the top overflow outlet. The cyclone guide vanes guide the fluid movement, enhancing the centrifugal separation effect and improving the solid-liquid separation efficiency. The sedimentation tank includes a rectangular tank body, a sludge discharge pipe, and a sludge discharge valve. The rectangular tank body is installed on one side of the cyclone separator, and a sludge discharge pipe is provided on its side for settling fine suspended solids; the sludge discharge valve is opened periodically to discharge the settled impurities and residues; the purified water is returned to the upstream of the device for recycling through a return water circulation system. The discharge device includes a screw conveyor. The screw conveyor has a closed structure and is equipped with spiral blades inside to facilitate the conveying of phosphogypsum particles.

[0006] The beneficial effects of this utility model are: The combination of high-pressure clean water injection components and multi-stage blade stirring shafts enables thorough mixing of phosphogypsum slurry and clean water, improving washing efficiency. The centrifugal separation principle of the cyclone separator enables rapid solid-liquid separation, overcoming the problem of slow traditional gravity settling. The secondary settling and water recycling system in the settling tank enables the reuse of water resources and reduces water consumption. Attached Figure Description

[0007] Figure 1 This is an isometric schematic diagram of the present invention.

[0008] Figure 2 This is a three-dimensional schematic diagram of the present invention.

[0009] Figure 3This is a top view of the structure of this utility model.

[0010] Figure 4 This is a partial cross-sectional view of the present invention.

[0011] Figure 5 This is a second partial cross-sectional view of the present invention.

[0012] In the attached diagram, the following are the reference numerals: 1. Feed hopper; 2. Clean water injection assembly; 3. Water washing and stirring device; 4. Overflow pipe; 5. Settling tank; 6. Cyclone separator; 7. Discharge device; 8. Vertical stirring drum; 9. Multi-stage blade stirring shaft; 10. Motor; 11. Conical shell; 12. Tangential inlet; 13. Cyclone guide vane; 14. Rectangular tank; 15. Sludge discharge pipe; 16. Sludge discharge valve; 17. Screw conveyor; 19. Water return circulation system. Detailed Implementation

[0013] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, so as to facilitate the understanding of those skilled in the art.

[0014] This utility model discloses a cyclone separation type water washing device for phosphogypsum. The device mainly includes a feed hopper 1, a clean water injection component 2, a water washing and stirring device 3, an overflow pipe 4, a settling tank 5, a cyclone separator 6, and a discharge device 7. The feed hopper 1 is fixedly connected to the top of the vertical stirring drum 8 of the water washing and stirring device 3. The outlet of the feed hopper 1 is connected to the internal cavity of the vertical stirring drum 8, used to guide the phosphogypsum slurry containing impurities into the device. The feed hopper 1 is designed with a conical structure, which can effectively guide the phosphogypsum slurry into the vertical stirring drum 8, avoiding material accumulation or blockage.

[0015] like Figure 4 , Figure 5 As shown, the clean water injection component 2 is located on one side of the washing and mixing device 3 and is connected to the side wall of the vertical mixing drum 8 via a pipe, used to introduce washing water into the device. The clean water injection component 2 includes a high-pressure water source, a nozzle, and a flow control valve. The high-pressure water source delivers water to the nozzle via the pipe. The nozzle is installed inside the vertical mixing drum 8 and connected to the pipe. The flow control valve is installed on the pipe to regulate the water flow rate. The nozzle ensures that the water flow evenly covers the phosphogypsum slurry in the form of a fine water column, ensuring sufficient contact between the washing water and the phosphogypsum slurry. A sealing ring is provided at the connection between the pipe of the clean water injection component 2 and the vertical mixing drum 8 to ensure good sealing performance and prevent leakage.

[0016] like Figure 4 , Figure 5As shown, the water washing and mixing device 3 includes a vertical mixing drum 8, a multi-stage blade mixing shaft 9, and a motor 10. The vertical mixing drum 8 has a cylindrical structure with a hollow interior to hold the phosphogypsum slurry and water. The multi-stage blade mixing shaft 9 is installed inside the vertical mixing drum 8, and its two ends are fixed to the top and bottom of the vertical mixing drum 8 by bearings to ensure stable rotation. The motor 10 is installed at the top of the vertical mixing drum 8 and is connected to the multi-stage blade mixing shaft 9 via a coupling to drive its rotation. The multi-stage blade mixing shaft 9 consists of multiple mixing blades distributed axially, ensuring thorough mixing of the phosphogypsum slurry and water within the vertical mixing drum 8. The arc-shaped structure of the mixing blades effectively enhances the shear force during the mixing process, further improving the mixing effect.

[0017] like Figure 4 , Figure 5 As shown, the cyclone separator 6 is installed on one side of the water washing and mixing device 3, and the two are connected by a slurry pump and a flexible pipe. One end of the flexible pipe is connected to the outlet of the vertical mixing drum 8, and the other end is connected to the tangential inlet 12 of the cyclone separator 6. The cyclone separator 6 includes a conical shell 11, a tangential inlet 12, and cyclone guide vanes 13. The conical shell 11 is an inverted conical structure with a tangential inlet 12 at its top, used to introduce the mixed slurry into the conical shell 11 at high speed. The cyclone guide vanes 13 are installed inside the conical shell 11 and are distributed in a spiral shape to guide the fluid movement. After the slurry enters through the tangential inlet 12, it rotates and flows along the inner wall of the conical shell 11 under the action of centrifugal force. The heavy phosphogypsum particles sink along the inner wall of the conical shell and are discharged from the bottom outlet; the light impurities and some water rise with the cyclone and enter the overflow pipe 4 through the top overflow port, thereby achieving efficient solid-liquid separation.

[0018] like Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the top of the overflow pipe 4 is connected to the top overflow port of the cyclone separator 6, and the bottom is connected to the rectangular pool body 14 of the settling tank 5. The overflow pipe 4 is arranged at an angle to ensure that the supernatant and light impurities can flow smoothly into the settling tank 5.

[0019] like Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, the sedimentation tank 5 is installed on one side of the cyclone separator 6, and includes a rectangular tank body 14, a sludge discharge pipe 15, and a sludge discharge valve 16. The rectangular tank body 14 has a cuboid structure, and the sludge discharge pipe 15 is provided on the side of the rectangular tank body 14 for settling fine suspended solids. The sludge discharge valve 16 is installed on the sludge discharge pipe 15 to facilitate the discharge of settled impurities and residues. The side wall of the sedimentation tank 5 is equipped with a return water circulation system 19 for returning purified water to the upstream of the device for recycling. The return water circulation system 19 includes a water pump and a filter. The water pump draws the purified water from the sedimentation tank 5 through a pipe and delivers it to the high-pressure water source of the purified water injection component 2. The filter is used to remove small particulate impurities in the water to ensure the quality of the returned water.

[0020] like Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the discharge device 7 is installed at the bottom of the cyclone separator 6 and includes a screw conveyor 17. The screw conveyor 17 has a closed structure with spiral blades inside. The spiral blades are connected to a drive motor via a shaft, and the drive motor is installed on one side of the screw conveyor 17. The screw conveyor 17 facilitates the conveying of phosphogypsum particles.

[0021] Work process: In the actual production of phosphogypsum purification, the phosphogypsum slurry containing impurities is first introduced into the vertical mixing drum 8 through the feed hopper 1. The feed hopper 1 has a conical structure, which can effectively guide the slurry into the vertical mixing drum 8, avoiding material accumulation or blockage. Then, the clean water injection component 2 is activated, and high-pressure water is delivered to the nozzles through pipelines. The nozzles disperse the water flow into fine water columns, evenly covering the surface of the phosphogypsum slurry, ensuring full contact between the washing water and the phosphogypsum slurry. The flow control valve in the clean water injection component 2 adjusts the water flow rate according to actual needs to achieve the supply of washing water.

[0022] Subsequently, motor 10 drives multi-stage blade stirring shaft 9 to rotate. Multiple stirring blades on the shaft are distributed axially and have an arc-shaped structure, enhancing shear force and improving the mixing effect of phosphogypsum slurry and water. During stirring, soluble impurities in the phosphogypsum slurry are fully dissolved in the water, forming a mixed slurry containing impurities. Due to the rotation of the multi-stage blade stirring shaft 9, the slurry continuously tumbles within the vertical stirring drum 8, resulting in more thorough contact between impurities and water, thereby improving the completeness of impurity removal.

[0023] The mixed slurry enters the cyclone separator 6 from the outlet of the vertical mixing drum 8 through a flexible pipe. The slurry enters the conical shell 11 at high speed from the tangential inlet 12. Under the action of centrifugal force, it rotates and flows along the inner wall of the conical shell 11. The cyclone guide vanes 13 are distributed in a spiral shape to guide the movement of the slurry fluid, so that the heavy phosphogypsum particles sink along the inner wall of the conical shell 11 and are discharged from the bottom outlet. Light impurities and some water rise with the cyclone and enter the overflow pipe 4 through the top overflow port, thereby achieving efficient solid-liquid separation.

[0024] Overflow pipe 4 introduces the supernatant and light impurities into settling tank 5. The inclined arrangement of overflow pipe 4 ensures smooth flow of the supernatant into settling tank 5. The rectangular tank body 14 of settling tank 5 provides sufficient settling space. A sludge discharge pipe 15 is located on the side of the rectangular tank body 14 for settling fine suspended solids. The sludge discharge valve 16 is periodically opened to discharge deposited impurities and residues. The water circulation system 19 on the side wall of settling tank 5 uses a water pump to extract purified water and transport it to the high-pressure water source of the water injection component 2 for recycling. The filter in the water circulation system 19 removes small particulate impurities from the water, ensuring that the returned water quality meets the requirements for reuse, thereby significantly reducing water consumption. Phosphogypsum particles discharged from the bottom of the air separator 6 are transported by a screw conveyor 17 for centralized collection and treatment.

[0025] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A hydrocyclone separation type water washing device for phosphogypsum, characterized in that: The aforementioned cyclone separation type water washing phosphogypsum device includes a feed hopper (1), a clean water injection component (2), a water washing and stirring device (3), an overflow pipe (4), a settling tank (5), a cyclone separator (6), and a discharge device (7). The feed hopper (1) is installed at the top of the water washing and stirring device (3). The clean water injection component (2) is located on one side of the water washing and stirring device (3) and is connected to the water washing and stirring device (3) through a pipe. A mortar pump and a cyclone separator (6) are installed on one side of the water washing and stirring device (3). The cyclone separator (6) is connected to the water washing and stirring device (3) through the mortar pump and the pipe. The settling tank (5) is installed on one side of the cyclone separator (6). The top of the overflow pipe (4) is connected to the cyclone separator (6), and the bottom is connected to the settling tank (5). The discharge device (7) is installed below the cyclone separator (6).

2. The hydrocyclone separation type water washing phosphogypsum device as described in claim 1, characterized in that: The clean water injection component (2) includes a high-pressure water source, a nozzle and a flow control valve. The high-pressure water source is connected to the water washing and stirring device (3) through a pipe. The nozzle is installed inside the water washing and stirring device (3) and connected to the pipe. The flow control valve is installed on the pipe.

3. The hydrocyclone separation type water washing phosphogypsum device as described in claim 2, characterized in that: The water washing and stirring device (3) includes a vertical stirring drum (8), a multi-stage blade stirring shaft (9), and a motor (10). The vertical stirring drum (8) is a cylindrical structure with a hollow interior. The multi-stage blade stirring shaft (9) is installed inside the vertical stirring drum (8), and the motor (10) is installed on the top of the vertical stirring drum (8) and is connected to the multi-stage blade stirring shaft (9) for transmission.

4. The hydrocyclone separation type water washing phosphogypsum device as described in claim 3, characterized in that: The cyclone separator (6) includes a conical shell (11), a tangential inlet (12), and cyclone guide vanes (13). The top of the conical shell (11) is provided with a tangential inlet (12), and the cyclone guide vanes (13) are installed inside the conical shell (11) and are distributed in a spiral shape.

5. The hydrocyclone separation type water washing phosphogypsum device as described in claim 1 or 2, characterized in that: The sedimentation tank (5) includes a rectangular tank body (14), a sludge discharge pipe (15) and a sludge discharge valve (16). The rectangular tank body (14) is provided with a sludge discharge pipe (15) on its side, and the sludge discharge valve (16) is installed on the sludge discharge pipe (15).

6. The hydrocyclone separation type water washing phosphogypsum device as described in claim 1 or 2, characterized in that: The discharge device (7) includes a screw conveyor (17), which is a closed structure with internal screw blades.

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