A phosphogypsum composite acid washing equipment

Abstract

This utility model discloses a phosphogypsum composite pickling device, including a pickling tank, a guide box, a screening trough, a retaining shell, and a conveying cylinder. The screening trough is fixedly installed inside the guide box, and the retaining shell is located in the middle of the upper surface of the screening trough. A bulk material spraying mechanism is also included, comprising a horizontal frame fixedly installed at the bottom of the inner surface of the guide box, with multiple equally spaced vertical rods inside the frame. This utility model improves the structure of the phosphogypsum composite pickling device, including the pickling tank, guide box, screening trough, retaining shell, and conveying cylinder. Through the coordinated operation of these components, adhesion can be effectively avoided, continuous feeding can be achieved, and the normal operation of the pickling process can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of phosphogypsum pickling technology, specifically to a phosphogypsum composite pickling equipment. Background Technology

[0002] Phosphogypsum contains varying amounts of soluble salt-forming elements such as phosphorus, fluorine, chlorine, magnesium, sodium, and potassium, as well as inorganic or organic dyes such as iron, titanium, and carbon. These impurities not only affect the quality of phosphogypsum but may also adversely affect the performance of products processed subsequently. Therefore, acid washing can be used to dissolve and recrystallize phosphogypsum, effectively removing impurities from the surface of phosphogypsum and those encased within it.

[0003] Chinese Patent No. CN117358674B discloses a phosphogypsum composite pickling equipment and process, including a pickling tank, a holding tank, a feeding device, and a rinsing device. When using this phosphogypsum composite pickling equipment, the phosphogypsum to be pickled is first poured into the feed hopper 41. The positioning motor 452 is started, and the positioning motor 452 drives the linkage roller 453 to rotate through the support shaft. The linkage roller 453 intermittently lifts the feed hopper 41 through the cooperation between the lifting bar 454 on its outer wall and the execution plate 455, realizing the vibration of the feed hopper 41 so as to facilitate the rapid feeding of phosphogypsum. Next, the water pump 51 is started. The water inlet pipe of the water pump 51 draws the pickling liquid from the container 2 and discharges it into the storage chamber 53 through the corrosion-resistant pipe 52. Then, the pickling liquid is sprayed out through the spray head 54 to rinse the phosphogypsum on the feed hopper 41. During this process, the baffle net 43 can block the phosphogypsum, so that the rinsing liquid can fully contact the phosphogypsum, increase the contact area between the phosphogypsum and the pickling liquid, and enhance the pickling effect. Then, the rinsed phosphogypsum and pickling liquid flow downward together to the upper end of the lifting plate 551.

[0004] However, in the above process, since the spray head 54 is a fixed direct spray type, its impact force is vertically downward, which may cause local blockage of the phosphogypsum below. In addition, the phosphogypsum is fed by vibration spreading, resulting in a large area, thin thickness, and concentration after spreading. Furthermore, the phosphogypsum may stick to the inner wall of the feed hopper 41 after encountering water, which can easily reduce the fluidity of the phosphogypsum, making it difficult to feed continuously and affecting the normal operation of the pickling work. Secondly, since phosphogypsum is generally in powder or granular form and has a high density, if the overall input is too large, it may not be able to disperse quickly in a short time, resulting in a thick overall thickness, easy agglomeration, and greater concentration. This makes it impossible for the phosphogypsum accumulated inside to be quickly soaked by the pickling solution, and it will still stick to the inner wall of the feed hopper 41. This means that the phosphogypsum may still be clumped in the spraying area, making it more likely to block the phosphogypsum behind. Utility Model Content

[0005] The purpose of this invention is to provide a phosphogypsum composite pickling device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the specific technical solution of this utility model is as follows: A phosphogypsum composite pickling device includes a pickling tank, a guide box, a screening trough, a baffle shell, and a conveying cylinder. The conveying cylinder is located in the middle of the upper part of the pickling tank. The guide box is fixedly installed in the middle of the upper surface of the pickling tank. The screening trough is fixedly installed inside the guide box. The baffle shell is located in the middle of the upper surface of the screening trough. The device also includes a bulk spraying mechanism for beating and adsorbing phosphogypsum powder. The bulk spraying mechanism includes a horizontal frame fixedly installed at the bottom of the inner surface of the guide box. Multiple vertical rods evenly spaced are arranged inside the horizontal frame. The baffle shell is used to block the phosphogypsum powder during screening. The baffle shell is bolted to the screening trough. Openings are provided on both sides of the upper surface of the pickling tank for gas discharge.

[0007] Preferably, one end of the conveying cylinder is closed, and the other end is connected to the outlet of an external blower. A hopper is fixedly installed on the top of the outer surface of the conveying cylinder, located at the blower position. The opening at the bottom of the guide box is connected to the opening at the top of the pickling tank. The screening tank has a semi-circular cross-section. Two guide plates are installed on both sides of the inner surface of the pickling tank, and two discharge pipes are provided on both sides of the lower surface of the pickling tank. The discharge pipes are located between the two guide plates, which are set at a 45-degree angle.

[0008] Preferably, a crossbar is rotatably mounted inside the feeding cylinder, and multiple equally spaced crushing blades are fixedly mounted on the outer surface of the crossbar. A feed pipe is located at the bottom of the outer surface of the feeding cylinder, away from the hopper. The two ends of the feed pipe are connected to the feeding cylinder and the material retainer, respectively. A guide plate is fixedly mounted on the inner surface of the feeding cylinder, located at the feed pipe. The guide plate has an arc-shaped structure. The guide plate is used to guide the gas flow, thereby allowing the phosphogypsum powder to be discharged along with the gas through the feed pipe. At least two guide plates are provided, arranged vertically.

[0009] Preferably, a spiral conveyor for transporting phosphogypsum powder is rotatably mounted inside the screening trough. Two fixed covers are respectively installed at both ends of the outer surface of the screening trough, located at the position of the spiral conveyor. The spiral conveyor rotates relative to the fixed covers. A spiral spring for resetting the spiral conveyor is wound inside the fixed covers. The two ends of the spiral spring are connected to the spiral conveyor and the fixed covers respectively. An O-ring is fixedly installed on the inner wall of the fixed covers. The outer surface of the spiral conveyor contacts the inner surface of the screening trough. The O-ring increases friction at the connection point and buffers the spiral conveyor during resetting.

[0010] Preferably, the system also includes a transmission mechanism for driving the crossbar and the auger conveyor. The transmission mechanism includes a fixed frame mounted on the outer end of the guide box, a drive gear fixedly mounted on the outer surface of the auger conveyor and located at the center of one end of the fixed frame, and a first synchronous pulley fixedly mounted on the outer surface of the crossbar and located at the center of one end of the fixed frame. A drive shaft is rotatably mounted on the top of the fixed frame via bearings, and intermittent gears and a second synchronous pulley are fixedly mounted on both sides of the outer surface of the drive shaft. The crossbar and the conveyor cylinder are coaxial.

[0011] Preferably, the intermittent gear corresponds to the drive gear in position and meshes with it for transmission. The second synchronous pulley corresponds to the first synchronous pulley in position and meshes with it via a first toothed transmission belt. The outer end of the drive shaft is connected to the output end of an external motor via a reducer. The second synchronous pulley and the first synchronous pulley have the same structure.

[0012] Preferably, the bottom end of the upright extends to the bottom of the inner surface of the pickling tank. The upright and the crossbeam are rotatably connected via bearings. A material rack for patting down falling phosphogypsum powder is fixedly installed at the middle of the top of the upright. The top of one of the material racks is connected to the output end of an external motor via a reducer. A third synchronous pulley is fixedly installed on the outer surface of the upright. Adjacent third synchronous pulleys are driven by a second toothed transmission belt. Two stirring racks for stirring the mixture are fixedly installed on both sides of the bottom outer surface of the upright. The crossbeam has an isosceles triangular cross-section to prevent the phosphogypsum powder from accumulating.

[0013] Preferably, the bulk material spraying mechanism further includes a liquid delivery pipe installed inside the pickling tank. A guide pipe is fixedly installed on the outer surface of the liquid delivery pipe at each upright position. Multiple annular pipes, evenly spaced, are fixedly installed on the outer surface of the guide pipes. The annular pipes rotate relative to the uprights, and multiple spray heads, also evenly spaced in a ring, are installed on the outer surface of the annular pipes. The inner cavities of the annular pipes, the guide pipes, and the liquid delivery pipes are interconnected.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model improves the structure of the phosphogypsum composite pickling equipment, including a pickling tank, a guide box, a screening tank, a material blocking shell, and a conveying cylinder. Through the linkage and cooperation between the aforementioned structures, the sticking phenomenon can be effectively avoided, continuous feeding can be achieved, and the normal operation of the pickling work can be guaranteed. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a planar sectional view of the present invention;

[0017] Figure 3 This is a partial side sectional view of the present invention. Figure 1 ;

[0018] Figure 4 This is a partial side sectional view of the present invention. Figure 2 ;

[0019] Figure 5 This is a partial enlarged cross-sectional view of the present invention;

[0020] Figure 6 This is a partial side sectional view of the present invention. Figure 3 ;

[0021] Figure 7 This is a partial planar sectional view of the present invention.

[0022] In the diagram: 100, pickling tank; 101, guide plate; 102, discharge pipe; 200, guide box; 300, screening trough; 301, spiral conveyor bar; 302, O-ring; 303, fixing cover; 304, spiral spring; 400, material blocking shell; 500, conveying cylinder; 501, crossbar; 502, feed pipe; 503, crusher blade; 504, air guide plate; 600, hopper; 700, transmission mechanism; 701, first synchronous belt pulley; 702. First toothed drive belt; 703. Intermittent gear; 704. Drive shaft; 705. Second synchronous pulley; 706. Fixed frame; 707. Drive gear; 800. Bulk material spraying mechanism; 801. Horizontal frame; 802. Infusion pipe; 803. Vertical pole; 804. Bulk material rack; 805. Third synchronous pulley; 806. Second toothed drive belt; 807. Guide pipe; 808. Spray head; 809. Annular pipe; 810. Mixing rack. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0024] Please see Figure 1-7 A composite pickling device for phosphogypsum includes a pickling tank 100, a guide box 200, a screening tank 300, a baffle shell 400, and a conveying cylinder 500. The conveying cylinder 500 is located in the middle of the upper part of the pickling tank 100 and is used to convey phosphogypsum powder. One end of the conveying cylinder 500 is closed, and the other end is connected to the air outlet of an external blower. A hopper 600 is fixedly installed on the top of the outer surface of the conveying cylinder 500, located at the blower position. In actual use, the operator can install a cover on the upper surface of the hopper 600 with a hinge as required to prevent the phosphogypsum powder from being thrown up. The guide box 200 is fixedly installed in the middle of the upper surface of the pickling tank 100. The opening at the bottom of the 200 is connected to the opening at the top of the pickling tank 100. The screening tank 300 is fixedly installed inside the guide box 200 for screening phosphogypsum powder. The baffle shell 400 is set in the middle of the upper surface of the screening tank 300. The cross-section of the screening tank 300 is designed as a semi-circular structure. Two guide plates 101 are installed on both sides of the inner surface of the pickling tank 100 for guiding the mixed liquid. Two discharge pipes 102 are set on both sides of the lower surface of the pickling tank 100. In actual use, the operator can install a valve body at the bottom of the discharge pipe 102 as required. The equipment also includes a bulk material spraying mechanism 800 for beating and adsorbing phosphogypsum powder.

[0025] Specifically, a crossbar 501 is rotatably installed inside the conveying cylinder 500. Multiple equally spaced crushing blades 503 are fixedly installed on the outer surface of the crossbar 501 for crushing lumpy phosphogypsum. A feed pipe 502 is located at the bottom of the outer surface of the conveying cylinder 500, away from the hopper 600, for guiding phosphogypsum powder into the screening tank 300. Both ends of the feed pipe 502 are connected to the conveying cylinder 500 and the baffle shell 400, respectively. An air guide plate 504 is fixedly installed on the inner surface of the conveying cylinder 500, located at the position of the feed pipe 502. The air guide plate 504 is arc-shaped. The sieve trough 300 has a rotating screw conveyor 301 for conveying phosphogypsum powder. Two fixed covers 303 are installed at both ends of the outer surface of the sieve trough 300, respectively, at the position of the screw conveyor 301. The screw conveyor 301 and the fixed covers 303 rotate relative to each other. The fixed covers 303 have a spiral spring 304 wound inside for resetting the screw conveyor 301. The two ends of the spiral spring 304 are connected to the screw conveyor 301 and the fixed cover 303 respectively. An O-ring 302 is fixedly installed on the inner wall of the fixed cover 303.

[0026] Furthermore, the device also includes a transmission mechanism 700 for driving the crossbar 501 and the screw conveyor 301. Specifically, the transmission mechanism 700 includes a fixed frame 706 mounted on the outer end of the guide box 200, a drive gear 707 fixedly mounted on the outer surface of the screw conveyor 301 and located at the middle of one end of the fixed frame 706, and a first synchronous pulley 701 fixedly mounted on the outer surface of the crossbar 501 and located at the middle of one end of the fixed frame 706. The top of the fixed frame 706 is rotatably mounted with a drive gear 707 via a bearing. Intermittent gears 703 and second synchronous pulleys 705 are fixedly mounted on both sides of the outer surface of the drive shaft 704. The intermittent gears 703 and the drive gears 707 are positioned opposite each other and mesh with each other. The second synchronous pulleys 705 and the first synchronous pulleys 701 are positioned opposite each other and mesh with each other through a first toothed transmission belt 702. The outer end of the drive shaft 704 is connected to the output end of an external motor through a reducer.

[0027] Furthermore, the bulk material spraying mechanism 800 includes a crossbeam 801 fixedly installed at the bottom of the inner surface of the guide box 200. Multiple uprights 803, evenly spaced, are arranged inside the crossbeam 801. The bottom ends of the uprights 803 extend to the bottom of the inner surface of the pickling tank 100. The uprights 803 and the crossbeam 801 are rotatably mounted via bearings. A bulk material rack 804 for patting the falling phosphogypsum powder is fixedly installed at the middle of the top of the uprights 803. The top of one of the bulk material racks 804 is connected to the output end of an external motor via a reducer, and the motor is connected to the reducer. The reducer can be connected to the pickling tank 100 via a bracket. A third synchronous pulley 805 is fixedly installed on the outer surface of the uprights 803. Adjacent third synchronous pulleys 805 are connected by a second toothed transmission belt 806. In terms of meshing transmission, it is worth noting that the outer surfaces of the two uprights 803 located at the leftmost and rightmost ends are each equipped with a third synchronous pulley 805, and the outer surfaces of the uprights 803 in the middle are each equipped with two third synchronous pulleys 805. Two stirring frames 810 for stirring the mixture are fixedly installed on both sides of the bottom outer surface of the uprights 803. The bulk material spraying mechanism 800 also includes a liquid delivery pipe 802 installed inside the pickling tank 100. A guide pipe 807 is fixedly installed on the outer surface of the liquid delivery pipe 802 at each upright 803 position. Multiple annular pipes 809 are fixedly installed on the outer surface of the guide pipes 807 and are evenly distributed. The annular pipes 809 rotate relative to the uprights 803. Multiple spray heads 808 are installed on the outer surface of the annular pipes 809 and are evenly distributed in an annular pattern.

[0028] The working process of this utility model is as follows:

[0029] Step 1: Phosphogypsum enters the conveying cylinder 500 through the hopper 600. At this time, the output shaft of the external motor during operation drives the drive shaft 704 to rotate through the reducer, causing the second synchronous pulley 705, the first toothed transmission belt 702 and the first synchronous pulley 701 to drive the crossbar 501 to rotate synchronously. Then, the phosphogypsum is crushed by the equally spaced crushing blades 503, and the phosphogypsum powder is blown into the screening tank 300 through the feed pipe 502 by blowing.

[0030] Step 2: The rotating drive shaft 704 drives the intermittent gear 703 to rotate, which causes the drive gear 707 to drive the screw conveyor 301 to rotate. When the intermittent gear 703 and the drive gear 707 are no longer meshed, the spiral spring 304 drives the screw conveyor 301 to rotate in the opposite direction, thereby repeatedly conveying the phosphogypsum powder so that the phosphogypsum powder falls evenly.

[0031] Step 3: During rotation, the upright 803 drives the bulk material rack 804 to rotate synchronously and beats the falling phosphogypsum powder to disperse it. The spray head 808 sprays liquid to absorb the phosphogypsum powder and condenses it into a mixed liquid inside the pickling tank 100. The mixing rack 810 then stirs the mixed liquid, and finally the discharge pipe 102 discharges the mixed liquid.

[0032] The embodiments described above are merely some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A phosphogypsum composite pickling device, comprising a pickling tank (100), a feed box (200), a screening tank (300), a retaining shell (400), and a conveying cylinder (500), wherein the conveying cylinder (500) is located in the middle of the upper part of the pickling tank (100), the feed box (200) is fixedly installed in the middle of the upper surface of the pickling tank (100), the screening tank (300) is fixedly installed inside the feed box (200), and the retaining shell (400) is disposed in the middle of the upper surface of the screening tank (300), characterized in that: Also includes: A bulk material spraying mechanism (800) for beating and adsorbing phosphogypsum powder includes a crossbeam (801) fixedly installed on the bottom of the inner surface of the guide box (200), and the crossbeam (801) has multiple uprights (803) arranged at equal intervals inside.

2. The phosphogypsum composite pickling equipment according to claim 1, characterized in that: One end of the conveying cylinder (500) is closed, and the other end of the conveying cylinder (500) is connected to the air outlet of the external blower. A hopper (600) is fixedly installed on the top of the outer surface of the conveying cylinder (500) at the blower position. The opening at the bottom of the guide box (200) is connected to the opening at the top of the pickling tank (100). The cross-section of the screening tank (300) is semi-circular. Two guide plates (101) are installed on both sides of the inner surface of the pickling tank (100). Two discharge pipes (102) are provided on both sides of the lower surface of the pickling tank (100).

3. The phosphogypsum composite pickling apparatus according to claim 1, characterized in that: A crossbar (501) is rotatably mounted inside the feed cylinder (500). Multiple crushing blades (503) are fixedly mounted on the outer surface of the crossbar (501) and are distributed at equal intervals. A feed pipe (502) is provided at the bottom of the outer surface of the feed cylinder (500) and away from the hopper (600). The two ends of the feed pipe (502) are connected to the feed cylinder (500) and the material blocking shell (400) respectively. A guide plate (504) is fixedly mounted on the inner surface of the feed cylinder (500) at the position of the feed pipe (502). The guide plate (504) has an arc-shaped structure design.

4. The phosphogypsum composite pickling apparatus according to claim 3, characterized in that: The sieve trough (300) is rotatably equipped with a spiral feed rod (301) for conveying phosphogypsum powder. Two fixed covers (303) are respectively installed at both ends of the outer surface of the sieve trough (300) and at the position of the spiral feed rod (301). The spiral feed rod (301) and the fixed covers (303) rotate relative to each other. The fixed covers (303) are wound with a spiral spring (304) for resetting the spiral feed rod (301). The two ends of the spiral spring (304) are respectively connected to the spiral feed rod (301) and the fixed cover (303). An O-ring (302) is fixedly provided on the inner wall of the fixed cover (303).

5. A phosphogypsum composite pickling apparatus according to claim 4, characterized in that: It also includes a transmission mechanism (700) for driving the crossbar (501) and the screw conveyor (301). The transmission mechanism (700) includes a fixed frame (706) installed at the outer end of the guide box (200), and a drive gear (707) fixedly installed on the outer surface of the screw conveyor (301) and located at the middle of one end of the fixed frame (706). It also includes a first synchronous pulley (701) fixedly installed on the outer surface of the crossbar (501) and located at the middle of one end of the fixed frame (706). A drive shaft (704) is rotatably mounted on the top of the fixed frame (706) via a bearing. An intermittent gear (703) and a second synchronous pulley (705) are fixedly installed on both sides of the outer surface of the drive shaft (704).

6. A phosphogypsum composite pickling apparatus according to claim 5, characterized in that: The intermittent gear (703) is positioned opposite to the drive gear (707), and the intermittent gear (703) meshes with the drive gear (707) for transmission. The second synchronous pulley (705) is positioned opposite to the first synchronous pulley (701), and the second synchronous pulley (705) and the first synchronous pulley (701) mesh with each other through the first toothed transmission belt (702). The outer end of the drive shaft (704) is connected and assembled to the output end of the external motor through a reducer.

7. A phosphogypsum composite pickling apparatus according to claim 6, characterized in that: The bottom end of the upright (803) extends to the bottom end of the inner surface of the pickling tank (100). The upright (803) and the cross frame (801) are rotatably connected by bearings. A bulk material rack (804) for beating the falling phosphogypsum powder is fixedly installed in the middle of the top of the upright (803). The top of one of the bulk material racks (804) is connected to the output end of an external motor through a reducer. A third synchronous pulley (805) is fixedly installed on the outer surface of the upright (803). The two adjacent third synchronous pulleys (805) are driven by a second toothed transmission belt (806). Two stirring racks (810) for stirring the mixture are fixedly installed on both sides of the bottom outer surface of the upright (803).

8. The phosphogypsum composite pickling apparatus according to claim 1, characterized in that: The bulk material spraying mechanism (800) also includes a liquid delivery pipe (802) installed inside the pickling tank (100). A guide pipe (807) is fixedly installed on the outer surface of the liquid delivery pipe (802) at each upright (803). A plurality of annular pipes (809) are fixedly installed on the outer surface of the guide pipes (807) and are distributed at equal intervals. The annular pipes (809) rotate relative to the uprights (803). A plurality of spray heads (808) are installed on the outer surface of the annular pipes (809) and are distributed at equal intervals in an annular pattern.

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