A device for separating water-soluble impurities from phosphogypsum

Abstract

The utility model discloses a kind of phosphogypsum water-soluble impurities separation devices, including barrel, baffle, motor, perturbation part, feed hopper, water inlet pipe and screw conveyor;The utility model has the advantages that: by setting on the perturbation part upper perturbation blade and cooperating with the arc baffle of cylinder wall, high-strength radial turbulent flow and mechanical shear force are generated, effectively disperse fine phosphogypsum wrapping agglomerate, destroy intercrystalline film, thereby substantially improve the dissolution rate of soluble phosphorus, fluorine inside particle;By setting the scraper that closely adheres to the conical section of cylinder on the stirring shaft bottom, and cooperate with the lower perturbation blade that is set obliquely.The upward lifting flow generated by lower blade prevents sedimentation, and the scraper forcibly mechanically scrapes the wall surface of cone bottom, completely eliminates flow dead angle, effectively prevents the blockage of discharge port caused by material hardening.

Description

Technical Field

[0001] This utility model relates to the field of phosphogypsum impurity separation technology, and in particular to a device for separating water-soluble impurities from phosphogypsum. Background Technology

[0002] Phosphogypsum contains water-soluble impurities, such as soluble phosphorus, fluorine, and organic impurities. Current phosphogypsum pretreatment mainly relies on conventional mixing tanks or hydrocyclones for impurity separation. However, phosphogypsum particles are fine and highly viscous, easily forming agglomerates in water. The laminar flow mixing methods of existing equipment do not provide sufficient shear force to completely break up the agglomerates, preventing the soluble phosphorus and fluorine trapped inside the particles from dissolving. Furthermore, traditional bottom discharge valves or simple screw conveyors tend to accumulate material in dead zones when processing high-viscosity phosphogypsum, leading to equipment blockage. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a device for separating water-soluble impurities in phosphogypsum.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A device for separating water-soluble impurities from phosphogypsum includes a barrel, baffles, a motor, a disturbance part, a feed hopper, a water inlet pipe, and a screw conveyor. Several baffles are staggered on the barrel wall. The motor is detachably connected to the upper end of the barrel. The disturbance part is vertically disposed within the barrel, and its upper end is fixedly connected to the output end of the motor extending into the barrel. A feed hopper is fixedly connected to the barrel wall near the uppermost baffle, and a water inlet pipe is connected to the barrel cover. A screw conveyor is fixedly connected to the lower end of the barrel.

[0006] Furthermore, the upper end of the barrel is a cylindrical section, and the lower end is a conical section.

[0007] Furthermore, the disturbance part includes a shaft, an upper disturbance blade, and a lower disturbance blade; the upper disturbance blade is fixedly connected to the upper part of the shaft; the lower disturbance blade is fixedly connected to the lower part of the shaft; the upper disturbance blade is vertically arranged; and the lower disturbance blade is inclined.

[0008] Furthermore, the number of baffles is half the sum of the upper and lower disturbance blades; there is a gap between the baffles and the upper and lower disturbance blades to facilitate the rotation of the disturbance part.

[0009] Furthermore, the number of upper and lower disturbance blades is the same, and they are all arranged in pairs.

[0010] Furthermore, the number of upper disturbance blades is six, and they are distributed relatively axially symmetrically.

[0011] Furthermore, a scraper is fixedly connected to the tapered section at the lower end of the shaft and near the barrel body; two scrapers are arranged symmetrically about the axis; the scraper contacts the tapered section of the barrel body; the scraper is fixedly connected to the shaft through connecting plate I and connecting plate II.

[0012] Furthermore, the pitch of the screw conveyor gradually shortens from the inlet to the outlet, and a filter screen for filtering water is provided at the lower end; a water collection tank is fixedly connected to the lower end of the filter screen; the dehydrated phosphogypsum is discharged from the outlet pipe of the screw conveyor; and the water is discharged from the drain pipe of the screw conveyor.

[0013] Furthermore, the baffle is an arc-shaped plate; and both blades of the upper disturbance blade are provided with conical protrusions.

[0014] The beneficial effects of this utility model are:

[0015] By incorporating upper disturbance blades on the stirring section and cooperating with the arc-shaped baffles on the cylinder wall, high-intensity radial turbulence and mechanical shear force are generated, effectively breaking down fine phosphogypsum aggregates and disrupting intergranular films, thereby significantly improving the dissolution rate of soluble phosphorus and fluorine within the particles. Furthermore, a scraper closely attached to the conical section of the cylinder is installed at the bottom of the stirring shaft, in conjunction with inclined lower disturbance blades. The lower blades generate an upward lifting flow to prevent settling, while the scraper mechanically scrapes the bottom wall of the cone, completely eliminating dead zones and effectively preventing material caking and discharge port blockage. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the cross-section of a screw conveyor.

[0018] In the diagram, 1-barrel body, 2-baffle plate, 3-motor, 4-turbulence section, 5-feed hopper, 6-water inlet pipe, 7-screw conveyor;

[0019] 41-Shaft, 42-Upper disturbance blade, 43-Lower disturbance blade, 44-Scraper;

[0020] 71-Filter screen, 72-Water collection tank, 73-Outlet pipe, 74-Drain pipe;

[0021] 441-Connecting plate I, 442-Connecting plate II. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0023] Reference Figure 1-2 As shown, a phosphogypsum water-soluble impurity separation device includes a barrel 1, baffles 2, a motor 3, a disturbance part 4, a feed hopper 5, a water inlet pipe 6, and a screw conveyor 7. Several baffles 2 are staggered on the barrel wall of the barrel 1. The motor 3 is detachably connected to the upper end of the barrel 1. The disturbance part 4 is vertically arranged inside the barrel 1 and its upper end is fixedly connected to the output end of the motor 3 that extends into the barrel 1. The feed hopper 5 is fixedly connected to the barrel wall near the uppermost baffle 2, and the water inlet pipe 6 is connected to the cover of the barrel 1. The screw conveyor 7 is fixedly connected to the lower end of the barrel 1.

[0024] It should be noted that the tank body 1, serving as the container for the entire reaction and washing process, is a vertically oriented hollow shell. To accommodate the rheological properties and sedimentation patterns of the phosphogypsum slurry, the upper part of the tank body 1 is cylindrical, and the lower part is conical. The cylindrical section provides ample mixing space, allowing the slurry to undergo thorough turbulent scrubbing; the lower conical section (inverted frustum shape) serves to collect and guide the slurry, using gravity to collect the washed slurry to the bottom outlet, preventing accumulation in dead zones. The tank body 1 is preferably made of acid-resistant stainless steel (such as 316L stainless steel), or has an inner carbon steel lining with an anti-corrosion layer (such as rubber lining or PTFE lining) to resist the acidic corrosion of the phosphogypsum slurry. The motor 3, as the power source, is detachably connected to the upper part of the tank body 1. Specifically, the top of the tank body 1 is equipped with a cover or crossbeam support, and the motor 3 is fixed to the center of the support via bolted flanges. To achieve suitable stirring torque and speed, motor 3 is preferably connected to a reducer, which can be understood as part of the motor assembly. For example, an XWD type cycloidal pinwheel reducer can be used, and the motor model can be a Y2-132 series three-phase asynchronous motor depending on the processing capacity. The disturbance unit 4 is the core component of this device, used to generate a strong flow field. The baffle plate 2 works in conjunction with the disturbance unit 4. The feed hopper 5 is positioned near the baffle plate to utilize the strong turbulence zone near the baffle plate, allowing the newly entered phosphogypsum to disperse quickly and prevent clumping and settling. A water inlet pipe 6 is connected to the lid of the tank 1 for continuously injecting cleaning water (e.g., process return water or clean water). The screw conveyor 7 not only serves a conveying function but, more importantly, also has a dewatering function.

[0025] Specifically, the disturbance section 4 includes a shaft 41, an upper disturbance blade 42, and a lower disturbance blade 43. The upper disturbance blade 42 is fixed to the upper part of the shaft 41; the lower disturbance blade 43 is fixed to the lower part of the shaft 41. The upper disturbance blade 42 is vertically arranged; the lower disturbance blade 43 is inclined. In this application, the number of baffles 2 is half the sum of the upper disturbance blades 42 and the lower disturbance blades 43. There is a gap between the baffles 2 and the upper and lower disturbance blades 42 and 43 to facilitate the rotation of the disturbance section 4. This gap constitutes a "shear channel". When the slurry flows through the narrow gap between the blade tip and the baffle, it will be subjected to strong hydraulic shear, further breaking up the agglomerates. The upper disturbance blade 42 is vertically arranged, that is, its blade plane is parallel to the shaft 41. When this vertical blade rotates, it mainly generates radial flow, that is, it throws the material out in all directions, providing strong shear force to break up the agglomerates of phosphogypsum. The lower disturbance blade 43 is inclined, meaning that the blade plane forms a certain angle (e.g., 30° to 60°) with the horizontal plane. This inclined blade (usually a propeller blade) mainly generates axial flow when rotating, which can lift the material at the bottom upwards, preventing phosphogypsum from settling too early at the bottom of the tank 1, thereby extending the residence and washing time of the material in the tank.

[0026] Specifically, the number of upper disturbance blades 42 and lower disturbance blades 43 are the same, and they are both arranged in pairs. The paired arrangement (i.e., symmetrical along the axial direction) helps to maintain the dynamic balance of the stirring shaft 41 and reduce vibration during high-speed rotation.

[0027] Specifically, there are six upper perturbation blades 42, which are symmetrically distributed relative to the axis 41. The high-density arrangement of the six vertical blades significantly increases the shear frequency, ensuring the number of times the phosphogypsum particles come into contact with water per unit time.

[0028] Specifically, a scraper 44 is fixedly connected to the conical section at the lower end of shaft 41 and near the barrel 1; two scrapers 44 are symmetrically arranged relative to shaft 41; the scraper 44 contacts the conical section of barrel 1 (or maintains a very small gap, such as 1-5mm); the scraper 44 is fixedly connected to shaft 41 through connecting plate I 441 and connecting plate II 442. Connecting plate I 441 and connecting plate II 442 form a stable triangular support structure to ensure that the scraper 44 does not deform under force. The outer edge contour of the scraper 44 matches the shape of the inner wall of the conical section, and continuously scrapes the inner wall during rotation, forcibly pushing the settled heavy gypsum towards the bottom outlet, completely eliminating dead corners.

[0029] Specifically, the pitch of the screw conveyor 7 gradually decreases from the inlet to the outlet, and a filter screen 71 for filtering water is provided at the lower end; a water collection tank 72 is fixedly connected to the lower end of the filter screen 71; the dehydrated phosphogypsum is discharged from the outlet pipe 73 of the screw conveyor 7; and the water is discharged from the drain pipe 74 of the screw conveyor 7. In this application, the pitch of the inlet section is designed to be 200 mm, and the pitch of the outlet section gradually decreases to 120 mm. This variable pitch design causes the volume between the screw blades to gradually decrease along the conveying direction, forcing the material to be subjected to gradually increasing mechanical extrusion pressure during the conveying process. The filter screen 71 is located at the bottom of the casing of the screw conveyor 7, and the aperture can be selected according to the gypsum particle size, for example, 60-100 mesh. Under the action of extrusion pressure, the water in the phosphogypsum is squeezed out and flows down through the filter screen 71. The water collection tank 72 is used to collect the filtered wastewater. The water is discharged from the drain pipe 74 of the screw conveyor 7 to the wastewater treatment system. The dehydrated phosphogypsum is discharged from the outlet pipe 73 of the screw conveyor 7. At this point, the moisture content of the material is significantly reduced, facilitating subsequent transportation or storage. The screw conveyor 7 can be a modified version of the LSY series screw conveyor (with a customized variable pitch shaft).

[0030] To enhance the cleaning effect, the baffle 2 is an arc-shaped plate, which is a planar arc-shaped plate that can increase the consular residence time; both surfaces of the upper disturbance blade 42 are provided with conical protrusions. These conical protrusions are regularly or irregularly distributed on the blade surface, similar to a "maverick" structure. When the blade rotates at high speed, the conical protrusions act as micro-turbulence generators, generating micro-vortices on the blade surface. Through intense mechanical collision, the organic film and impurities attached to the surface of the phosphogypsum crystals are peeled off. This is one of the key details of this invention to improve the impurity removal rate.

[0031] The working principle of this utility model:

[0032] During operation, phosphogypsum raw material enters the tank 1 through the feed hopper 5, while washing water is injected through the water inlet pipe 6. The motor 3 drives the shaft 41 to rotate at high speed. The vertical surface of the upper disturbance blades 42, combined with the conical protrusions on the surface, subjectes the slurry to intense radial shearing and collision, breaking the intercrystalline membrane of the phosphogypsum and releasing the encapsulated acidic impurities. The lower disturbance blades 43 generate upward lift, raising particles attempting to settle at the bottom and mixing them with the upper fluid; simultaneously, the arc-shaped baffle 2 disrupts vortices, enhancing turbulence and ensuring that every gypsum particle is thoroughly washed by water. The bottom scraper 44 continuously scrapes the inner wall of the conical section to prevent gypsum caking, ensuring that the high-concentration slurry smoothly enters the bottom screw conveyor. The slurry entering the screw conveyor 7 is continuously compressed in volume under the push of the variable-pitch blades. Water is physically squeezed out and separated through the filter screen 71, achieving integrated washing and dewatering operations, significantly reducing energy consumption in subsequent drying processes.

[0033] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A device for separating water-soluble impurities in phosphogypsum, characterized in that: The device includes a barrel body (1), baffles (2), a motor (3), a disturbance part (4), a feed hopper (5), a water inlet pipe (6), and a screw conveyor (7); several baffles (2) are staggered on the barrel wall of the barrel body (1); the motor (3) is detachably connected to the upper end of the barrel body (1); the disturbance part (4) is vertically arranged inside the barrel body (1) and its upper end is fixedly connected to the output end of the motor (3) that extends into the barrel body (1); a feed hopper (5) is fixedly connected to the wall of the barrel body (1) near the uppermost baffle (2), and a water inlet pipe (6) is connected to the cover of the barrel body (1); a screw conveyor (7) is fixedly connected to the lower end of the barrel body (1).

2. The phosphogypsum water-soluble impurity separation device according to claim 1, characterized in that: The upper end of the barrel (1) is a cylindrical section, and the lower end is a conical section.

3. The phosphogypsum water-soluble impurity separation device according to claim 1, characterized in that: The disturbance part (4) includes a shaft (41), an upper disturbance blade (42), and a lower disturbance blade (43); the upper disturbance blade (42) is fixed to the upper part of the shaft (41); the lower disturbance blade (43) is fixed to the lower part of the shaft (41); the upper disturbance blade (42) is vertically arranged; the lower disturbance blade (43) is inclinedly arranged.

4. The phosphogypsum water-soluble impurity separation device according to claim 3, characterized in that: The number of the baffles (2) is half the sum of the upper disturbance blades (42) and the lower disturbance blades (43); there is a gap between the baffles (2) and the upper disturbance blades (42) and the lower disturbance blades (43) to facilitate the rotation of the disturbance part (4).

5. The phosphogypsum water-soluble impurity separation device according to claim 4, characterized in that: The number of upper disturbance blades (42) and lower disturbance blades (43) is the same, and they are all arranged in pairs.

6. The phosphogypsum water-soluble impurity separation device according to claim 5, characterized in that: The number of the upper disturbance blades (42) is six, and they are symmetrically distributed relative to the axis (41).

7. The phosphogypsum water-soluble impurity separation device according to claim 3, characterized in that: A scraper (44) is fixedly connected to the tapered section of the lower end of the shaft (41) and close to the barrel (1); two scrapers (44) are symmetrically arranged relative to the shaft (41); the scraper (44) is in contact with the tapered section of the barrel (1); the scraper (44) is fixedly connected to the shaft (41) through connecting plate I (441) and connecting plate II (442).

8. The phosphogypsum water-soluble impurity separation device according to claim 1, characterized in that: The pitch of the screw conveyor (7) gradually shortens from the inlet to the outlet, and a filter screen (71) for filtering water is provided at the lower end; a water collection tank (72) is fixedly connected to the lower end of the filter screen (71); the dehydrated phosphogypsum is discharged from the outlet pipe (73) of the screw conveyor (7); and the water is discharged from the drain pipe (74) of the screw conveyor (7).

9. The phosphogypsum water-soluble impurity separation device according to claim 3, characterized in that: The baffle (2) is an arc-shaped plate; both blades of the upper disturbance blade (42) are provided with conical protrusions.

Images