Method for preparing sludge dewatering agent by using modified phosphogypsum

Abstract

The present application relates to sludge dewatering agent preparation technical field, specifically disclose a kind of method for preparing sludge dewatering agent using modified phosphogypsum, the dewatering agent preparation method includes the following steps: step 1, impurity removal treatment: using phosphogypsum or calcium sulfate is treated by impurity removal machine;Step 2, micro powder treatment: using broken grinder to phosphogypsum or calcium sulfate is broken and ground, phosphogypsum is prepared into phosphogypsum micro powder, and calcium sulfate is prepared into calcium sulfate micro powder;Step 3, screening treatment: using screening machine to phosphogypsum micro powder or calcium sulfate micro powder is screened and treated;Step 4, modification calcination: using calcining furnace to phosphogypsum micro powder or calcium sulfate micro powder is modified by calcination, and modified phosphogypsum micro powder and modified calcium sulfate micro powder are obtained.The present application is provided with a series of structures, and the dewatering agent configuration process is simple, the specific surface area increases, the pore structure is optimized, realizes sludge deep dewatering, calcination modification is uniform and fast, and calcination in and out of material is convenient.

Description

Technical Field

[0001] This invention relates to the field of sludge dewatering agent preparation technology, specifically a method for preparing sludge dewatering agent using modified phosphogypsum. Background Technology

[0002] Industrial production and daily life processes generate substantial amounts of wastewater. The most feasible way to treat the resulting sludge at the end of wastewater treatment is incineration. However, sludge incineration results in a moisture content exceeding 35%, requiring further drying. Sludge dewatering agents primarily consist of inorganic compounds, sludge surface structure modifiers, degreasing agents, cell wall disruptors, sludge surface treatment agents, sludge stripping agents, and other chemical agents.

[0003] Currently, sludge dewatering agents have complex compositions and high raw material costs, resulting in limited industrial applications and immature large-scale production technology. This may increase the overall cost of sludge treatment, and the dewatering efficiency of sludge dewatering agents is low. Furthermore, during the use of calcination equipment for preparing raw materials for sludge dewatering agents, the calcined materials are unevenly heated due to varying distances from the heating source, leading to low calcination efficiency, high costs, and inconvenient high-temperature feeding and discharging in the calcination furnace. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing a sludge dewatering agent using modified phosphogypsum, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing a sludge dewatering agent using modified phosphogypsum, the method comprising the following steps: Step 1, Impurity Removal Treatment: Use an impurity removal machine to remove impurities from phosphogypsum or calcium sulfate; Step 2, Micronized Powder Processing: Use a crushing and grinding mill to crush and grind phosphogypsum or calcium sulfate to prepare phosphogypsum micronized powder and calcium sulfate micronized powder. Step 3, Screening: Use a screening machine to screen the phosphogypsum powder or calcium sulfate powder. Step 4, Modification and Calcination: Calcination and modification of phosphogypsum powder or calcium sulfate powder are carried out using a calcination furnace to obtain modified phosphogypsum powder and modified calcium sulfate powder. Step 5, Mixing and Preparation: Use a mixer to mix the dewatering agent raw materials evenly to prepare industrial sludge dewatering agent and domestic sludge dewatering agent; Step 6, Packaging and Storage: Use a packaging machine to package the industrial sludge dewatering agent and the domestic sludge dewatering agent.

[0006] Preferably, the industrial sludge dewatering agent comprises modified phosphogypsum powder, PAC and ferrous sulfate, wherein the modified phosphogypsum powder accounts for 50% by weight. The composition of the sewage sludge dewatering agent includes modified calcium sulfate powder, aluminum sulfate and ferrous sulfate, wherein the modified calcium sulfate powder accounts for 50% by weight.

[0007] Preferably, the calcining furnace includes a furnace body, a discharge mechanism, a calcining cylinder, a feeding mechanism, and an electric heater. The discharge mechanism is located at the bottom of the furnace body. The calcining cylinder is located inside the furnace body via a rotating mechanism. A turning mechanism is located inside the calcining cylinder. An electric heater is located inside the furnace body below the calcining cylinder. A temperature sensor is located inside the furnace body above the calcining cylinder. A feeding mechanism is located at the top of the furnace body. An annular protrusion is located in the middle of the outer side of the calcining cylinder. An inlet and outlet communicating with the calcining cylinder are located on the annular protrusion. An annular sealing platform is located in the middle of the inner wall of the furnace body. The top of the annular protrusion is fitted to the outer surface of the calcining cylinder. An annular sealing groove is located on the annular sealing platform. The annular protrusion is located in the annular sealing groove of the annular sealing platform. A sealing mechanism is located between the annular sealing platform and the annular protrusion. A support base is located at the bottom of the furnace body. An inlet corresponding to the inlet and outlet is located at the top of the furnace body. An outlet corresponding to the inlet and outlet is located at the bottom of the furnace body.

[0008] Preferably, the discharge mechanism includes a corner cylinder, a discharge plate, and a sealing seat. The corner cylinder is installed on one side of the bottom outlet of the furnace body via an mounting plate. The output end of the corner cylinder is connected to the discharge plate via a piston rod. A sealing seat is provided on the top of the discharge plate.

[0009] Preferably, the rotating mechanism includes a rotating disk, a first gear, a second gear, and a servo motor. One end of the calcining cylinder is provided with a rotating disk, which is rotatably connected to the furnace body via a rotating shaft. The other end of the calcining cylinder is provided with a first gear, which is rotatably connected to the furnace body via a gear shaft. Inside the furnace body above the first gear, a second gear is provided via a gear shaft. The first gear and the second gear are meshed together. A servo motor is provided on the upper part of one side of the furnace body via a motor mount. The output end of the servo motor is connected to the gear shaft of the second gear via a reducer.

[0010] Preferably, the turning mechanism includes a turning rod and a turning plate. The turning rod is provided in the middle of the calcining cylinder. The turning rod passes through a through hole, passes through the rotating disk and the first gear, and is connected to the furnace body. The turning plate is provided on the turning rod through a connecting rod.

[0011] Preferably, the feeding mechanism includes a feeding hopper, a feeding cylinder, a feeding plate, a feeding port, a feeding motor, and an electric telescopic rod. The feeding hopper is located above the furnace body, and the feeding cylinder is connected to the bottom of the feeding hopper. The feeding plate is located on the upper part of the inner side of the feeding cylinder via a connecting shaft. The feeding motor is located on the upper part of one side of the feeding cylinder via a motor mount. The output end of the feeding motor is connected to the connecting shaft on one side of the feeding plate via a reducer. The feeding port connected to the inlet is located at the top of the furnace body. The bottom of the feeding cylinder is located inside the feeding port. The electric telescopic rods are located on the top of the furnace body on both sides opposite the feeding port via mounting plates. The output end of the top of the electric telescopic rods is connected to the feeding hopper via a connecting seat.

[0012] Preferably, the sealing mechanism includes a sealing groove, a limiting groove, a sealing pressure ring, and a limiting ring. The top of the annular sealing platform is provided with a sealing groove, and the inner side of the annular sealing platform is provided with a limiting groove of annular structure. The outer sides of the calcining cylinder on opposite sides of the annular protrusion are provided with sealing pressure rings, which are located inside the sealing groove. The opposite sides of the annular protrusion are provided with limiting rings of annular structure, which are located inside the limiting groove.

[0013] Preferably, the calcining cylinder is configured as a conical cylinder with a convex center and two conical ends, and blades are provided on the outside of the calcining cylinder.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This method for preparing sludge dewatering agents using modified phosphogypsum involves impurity removal, grinding and powdering, sieving, calcination modification, mixing, and packaging to obtain industrial and domestic sludge dewatering agents. The industrial sludge dewatering agent is prepared from 50% modified phosphogypsum powder + PAC + ferrous sulfate, while the domestic sludge dewatering agent is prepared from 50% modified calcium sulfate powder + aluminum sulfate + ferrous sulfate. The preparation process is simple and suitable for large-scale production. The calcination modification increases the specific surface area and optimizes the pore structure of the modified phosphogypsum powder and modified calcium sulfate powder, improving their efficiency as adsorption or catalytic carriers and achieving deep dewatering of sludge.

[0015] 2. This method for preparing sludge dewatering agent using modified phosphogypsum utilizes a calcination cylinder and electric heater located inside the furnace to achieve calcination modification of phosphogypsum powder or calcium sulfate powder. Gears No. 1 and No. 2 on the calcination cylinder, in conjunction with a servo motor, enable the calcination cylinder to rotate within the furnace. Combined with the turning rods and plates inside the calcination cylinder, the calcined material is rotated and turned within the cylinder, resulting in uniform and rapid calcination modification. Rotating blades on the outside of the calcination cylinder promote airflow within the furnace, ensuring uniform calcination temperature and high calcination efficiency.

[0016] 3. This method for preparing sludge dewatering agent using modified phosphogypsum utilizes annular protrusions and inlets / outlets on the calcining cylinder. The inlets / outlets cooperate with the feed hopper, feed cylinder, feed plate, and feed port, facilitating feeding into the calcining cylinder. The inlets / outlets cooperate with the corner cylinder, discharge plate, and sealing seat, facilitating discharge from the calcining cylinder. Furthermore, the annular protrusions on the calcining cylinder cooperate with the annular sealing platform on the furnace body. A sealing groove and sealing pressure ring, a limiting groove and a limiting ring are provided between the annular protrusions and the annular sealing platform, ensuring good sealing performance of the inlet and outlet of the calcining cylinder. Attached Figure Description

[0017] Figure 1 This is a flowchart of the dehydrating agent preparation method of the present invention; Figure 2 This is a schematic diagram of the calcining furnace in this invention; Figure 3 This is a schematic diagram of the furnace body in this invention; Figure 4 This is a schematic diagram of the calcining cylinder in this invention; Figure 5 For the present invention Figure 3 Enlarged structural diagram at point A in the middle.

[0018] In the diagram: 1. Furnace body; 2. Discharge mechanism; 21. Corner cylinder; 22. Discharge plate; 23. Sealing seat; 24. Annular sealing platform; 25. Sealing groove; 26. Limiting groove; 27. Sealing pressure ring; 28. Limiting ring; 3. Calcination cylinder; 31. Rotary disk; 32. Gear No. 1; 33. Gear No. 2; 34. Servo motor; 35. Annular protrusion; 36. Inlet and outlet; 4. Tilting rod; 41. Tilting plate; 5. Electric heater; 6. Feed hopper; 61. Feed cylinder; 62. Feeding plate; 63. Feed inlet; 64. Feeding motor; 65. Electric telescopic rod; 7. Blade; 8. Support seat; 9. Screening machine; 10. Crushing and grinding machine; 11. Impurity removal machine; 12. Mixer; 13. Packaging machine; 14. Calcination furnace. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] like Figures 1 to 5 As shown in the figure, this embodiment describes a method for preparing a sludge dewatering agent using modified phosphogypsum. The method for preparing the dewatering agent includes the following steps: Step 1, Impurity Removal Treatment: Use impurity removal machine 11 to remove impurities from phosphogypsum or calcium sulfate; Step 2, Micronized Powder Processing: Use a crusher and grinder 10 to crush and grind phosphogypsum or calcium sulfate to prepare phosphogypsum micronized powder and calcium sulfate micronized powder. Step 3, Screening: Use screening machine 9 to screen the phosphogypsum powder or calcium sulfate powder; Step 4, Modification and Calcination: Calcination furnace 14 is used to modify phosphogypsum powder or calcium sulfate powder to obtain modified phosphogypsum powder and modified calcium sulfate powder. Step 5, Mixing and Preparation: Use mixer 12 to mix the dewatering agent raw materials evenly to prepare industrial sludge dewatering agent and domestic sludge dewatering agent; Step 6, Packaging and Storage: Use packaging machine 13 to package industrial sludge dewatering agent and domestic sludge dewatering agent.

[0022] Specifically, the components of the industrial sludge dewatering agent include modified phosphogypsum powder, PAC and ferrous sulfate, of which modified phosphogypsum powder accounts for 50% by weight. The components of the domestic sewage sludge dewatering agent include modified calcium sulfate powder, aluminum sulfate and ferrous sulfate, of which modified calcium sulfate powder accounts for 50% by weight.

[0023] Furthermore, the calcining furnace 14 includes a furnace body 1, a discharge mechanism 2, a calcining cylinder 3, a feeding mechanism, and an electric heater 5. The discharge mechanism 2 is located at the bottom of the furnace body 1. The calcining cylinder 3 is located inside the furnace body 1 via a rotating mechanism. A turning mechanism is located inside the calcining cylinder 3. An electric heater 5 is located inside the furnace body 1 below the calcining cylinder 3. A temperature sensor is located inside the furnace body 1 above the calcining cylinder 3. A feeding mechanism is located at the top of the furnace body 1. An annular protrusion 35 is located in the middle of the outer surface of the calcining cylinder 3. An inlet / outlet 36 communicating with the calcining cylinder 3 is located on the annular protrusion 35. The middle of the inner wall of the furnace body 1... The furnace 14 is equipped with an annular sealing platform 24. The top of the annular protrusion 35 is fitted to the outer surface of the calcining cylinder 3. The annular sealing platform 24 is provided with an annular sealing groove. The annular protrusion 35 is located in the annular sealing groove of the annular sealing platform 24. A sealing mechanism is provided between the annular sealing platform 24 and the annular protrusion 35. The bottom of the furnace body 1 is provided with a support base 8. The top of the furnace body 1 is provided with an inlet corresponding to the inlet and outlet 36. The bottom of the furnace body 1 is provided with an outlet corresponding to the inlet and outlet 36. The calcining furnace 14 is convenient for feeding and discharging materials. The calcination rotation and turning of materials make the calcination modification of phosphogypsum powder or calcium sulfate powder uniform and efficient.

[0024] Furthermore, the discharge mechanism 2 includes a corner cylinder 21, a discharge plate 22, and a sealing seat 23. The corner cylinder 21 is installed on one side of the bottom outlet of the furnace body 1 via an installation plate. The output end of the bottom of the corner cylinder 21 is connected to the discharge plate 22 via a piston rod. The top of the discharge plate 22 is provided with a sealing seat 23. After calcination, the inlet and outlet 36 on the calcining cylinder 3 rotate downward to correspond to the bottom outlet of the furnace body 1. The corner cylinder 21 on the furnace body 1 pushes the discharge plate 22 and the sealing seat 23 to move down and rotate. The calcined material inside the calcining cylinder 3 is discharged from the inlet and outlet 36. After the calcining cylinder 3 finishes discharging, the corner cylinder 21 drives the discharge plate 22 and the sealing seat 23 to rotate and move upward to the bottom of the furnace body 1 to seal the outlet.

[0025] Furthermore, the rotating mechanism includes a rotating disk 31, a first gear 32, a second gear 33, and a servo motor 34. One end of the calcining cylinder 3 is equipped with a rotating disk 31, which is rotatably connected to the furnace body 1 via a rotating shaft. The other end of the calcining cylinder 3 is equipped with a first gear 32, which is rotatably connected to the furnace body 1 via a gear shaft. Inside the furnace body 1 above the first gear 32, a second gear 33 is provided via a gear shaft, and the first gear 32 and the second gear 33 are meshed together. The upper part of one side of the furnace body 1 is equipped with a servo motor 34 via a motor mount. The output end of the servo motor 34 is connected to the gear shaft of the second gear 33 via a reducer. The servo motor 34 is controlled by computer programming. The servo motor 34 on the furnace body 1 drives the second gear 33 to rotate, and the rotation of the second gear 33 drives the first gear 32 meshing with it to rotate, thereby causing the calcining cylinder 3 and the rotating disk 31 to rotate inside the furnace body 1. During the rotation, the phosphogypsum powder or calcium sulfate powder inside the calcining cylinder 3 is carried and rotated.

[0026] Furthermore, the material turning mechanism includes a turning rod 4 and a turning plate 41. The turning rod 4 is located in the middle of the calcining cylinder 3. The turning rod 4 is connected to the furnace body 1 through a through hole, passing through the rotating disk 31 and the first gear 32. The turning plate 41 is provided on the turning rod 4 through a connecting rod. When the calcining cylinder 3 rotates, the turning plate 41 inside the calcining cylinder 3 is fixed on the turning rod 4 and does not rotate with the calcining cylinder 3. The turning plate 41 performs shearing, squeezing and turning actions on the material inside the calcining cylinder 3 to enhance mixing.

[0027] Furthermore, the feeding mechanism includes a feeding hopper 6, a feeding cylinder 61, a feeding plate 62, a feeding port 63, a feeding motor 64, and an electric telescopic rod 65. The feeding hopper 6 is located above the furnace body 1, and the bottom of the feeding hopper 6 is connected to the feeding cylinder 61. The upper part of the inner side of the feeding cylinder 61 is connected to the feeding plate 62 via a connecting shaft. The upper part of one side of the feeding cylinder 61 is connected to the feeding motor 64 via a motor mount. The output end of the feeding motor 64 is connected to the connecting shaft on one side of the feeding plate 62 via a reducer. The top of the furnace body 1 has a feeding port 63 connected to the inlet. The bottom of the feeding cylinder 61 is located inside the feeding port 63. The outer diameter of the feeding cylinder 61 is the same as the inner diameter of the feeding port 63. When the feeding cylinder 61 is closed, it can block the feeding port 63. Electric telescopic rods 65 are installed on the top of the furnace body 1 on opposite sides of the feeding port 63 via mounting plates. The output end of the electric telescopic rod 65 is connected to the feed hopper 6 via a connecting seat. The feed motor 64 is controlled to rotate forward and backward by computer programming. The two electric telescopic rods 65 are controlled to run synchronously by a controller. The inlet and outlet 36 on the calcining cylinder 3 are rotated upward. The inlet and outlet 36 are connected to the inlet and feed port 63 on the furnace body 1. The feed motor 64 on the feed cylinder 61 drives the feed plate 62 to rotate, opening the feed cylinder 61. The electric telescopic rod 65 drives the feed hopper 6 to move downward. The lower end of the feed cylinder 61 passes through the feed port 63 and is inserted into the inside of the inlet and outlet 36. Phosphogypsum powder or calcium sulfate powder is added into the inside of the calcining cylinder 3 through the feed hopper 6, the feed cylinder 61, and the inlet and outlet 36. After feeding is completed, the feed plate 62 rotates to close the feed cylinder 61. The electric telescopic rod 65 drives the feed hopper 6 and the feed cylinder 61 to move upward.

[0028] Furthermore, the sealing mechanism includes a sealing groove 25, a limiting groove 26, a sealing pressure ring 27, and a limiting ring 28. The top of the annular sealing platform 24 is provided with a sealing groove 25, and the inner side of the annular sealing platform 24 is provided with a limiting groove 26 of annular structure. The annular protrusion 35 is provided with a sealing pressure ring 27 on the outside of the calcining cylinder 3 on both sides opposite to it. The sealing pressure ring 27 is located inside the sealing groove 25. The annular protrusion 35 is provided with a limiting ring 28 of annular structure on both sides opposite to it. The limiting ring 28 is located inside the limiting groove 26. During the rotation of the calcining cylinder 3 in the furnace body 1, the annular protrusion 35 on the outside of the calcining cylinder 3 is sealed and rotated within the annular sealing platform 24, the sealing pressure ring 27 is sealed and rotated within the sealing groove 25, and the limiting ring 28 is limited and sealed within the limiting groove 26.

[0029] Furthermore, the calcining cylinder 3 is designed as a conical cylinder with a convex center and two conical ends. The outside of the calcining cylinder 3 is provided with blades 7. The rotation of the blades 7 on the outside of the calcining cylinder 3 promotes the flow of air inside the furnace body 1.

[0030] The method of use in this embodiment is as follows: Phosphogypsum or calcium sulfate is treated by a cleaning machine 11 to remove impurities. The treated phosphogypsum or calcium sulfate is then ground into powder by a crushing and grinding mill 10 to prepare phosphogypsum micro powder and calcium sulfate micro powder. The phosphogypsum micro powder or calcium sulfate micro powder is then sieved using a screening machine 9. The phosphogypsum micro powder or calcium sulfate micro powder is then calcined and modified using a calcining furnace 14 to obtain modified phosphogypsum micro powder and modified calcium sulfate micro powder. The dehydrating agent raw materials are then mixed evenly using a mixer 12. The modified phosphogypsum micro powder + PAC + ferrous sulfate are then combined to obtain industrial sludge. A dewatering agent is prepared by combining modified calcium sulfate powder, aluminum sulfate, and ferrous sulfate to obtain a domestic sewage sludge dewatering agent. A sludge dewatering agent is also prepared by combining modified phosphogypsum powder. It can release the bound water in the sludge gel system into the supernatant by compressing the double electric layer and neutralizing the charge, making it free water that is easy to remove. It also utilizes its own positive charge and porous structure to agglomerate sludge particles into large flocs that are easy to settle through bridging adsorption and porous adsorption processes. At the same time, it also provides high-strength skeletal support for sludge particles, improves the strength of sludge flocs, and achieves deep dewatering under the action of the outer shrinkage of the plate and frame and the multi-directional supporting force of the inner floc skeleton. Processing of phosphogypsum powder or calcium sulfate powder: The inlet and outlet 36 on the calcining cylinder 3 are rotated upwards and connected to the inlet and feed port 63 on the furnace body 1. The feeding motor 64 on the feed cylinder 61 drives the feed plate 62 to rotate, opening the feed cylinder 61. The electric telescopic rod 65 drives the feed hopper 6 to move downwards. The lower end of the feed cylinder 61 passes through the feed port 63 and is inserted into the inside of the inlet and outlet 36, adding phosphogypsum powder or calcium sulfate powder from the feed hopper 6 through the feed cylinder 61 and the inlet and outlet 36 into the inside of the calcining cylinder 3. After feeding is completed, the feeding plate 62 rotates to close the feeding cylinder 61. The electric telescopic rod 65 drives the feeding hopper 6 and the feeding cylinder 61 to move upward, heating the electric heater 5 inside the furnace body 1 to the calcination temperature of phosphogypsum powder or calcium sulfate powder. The servo motor 34 on the furnace body 1 drives the second gear 33 to rotate. The rotation of the second gear 33 drives the first gear 32 meshing with it to rotate, causing the calcination cylinder 3 and the rotating disk 31 to rotate inside the furnace body 1. During the rotation, the phosphogypsum powder inside the calcination cylinder 3... The powder or calcium sulfate powder is carried and rotated. When the calcining cylinder 3 rotates, the internal turning plate 41 of the calcining cylinder 3 is fixed on the turning rod 4 and does not rotate with the calcining cylinder 3. The turning plate 41 performs shearing, squeezing and turning action on the material inside the calcining cylinder 3 to enhance mixing. The calcined material inside the calcining cylinder 3 is rotated and turned, and the calcination modification is uniform and rapid. The blades 7 set on the outside of the calcining cylinder 3 rotate to promote the air flow inside the furnace body 1. The calcination temperature inside the furnace body 1 is uniform, and the calcination furnace 14 is highly efficient. After calcination, the inlet and outlet 3 on the calcining cylinder 3 The 6-rotating downward-facing outlet corresponds to the bottom of the furnace body 1. The corner cylinder 21 on the furnace body 1 pushes the discharge plate 22 and the sealing seat 23 to move down and rotate. The calcined material inside the calcining cylinder 3 is discharged from the inlet and outlet 36. The calcining cylinder 3 is easy to feed and discharge. During the rotation of the calcining cylinder 3 inside the furnace body 1, the annular protrusion 35 on the outside of the calcining cylinder 3 is sealed and rotated in the annular sealing platform 24, the sealing pressure ring 27 is sealed and rotated in the sealing groove 25, and the limiting ring 28 is limited and sealed in the limiting groove 26, which provides good sealing for the inlet and outlet 36 of the calcining cylinder 3.

[0031] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a sludge dewatering agent using modified phosphogypsum, characterized in that: The method for preparing this dehydrating agent includes the following steps: Step 1, Impurity Removal Treatment: Use an impurity removal machine (11) to remove impurities from phosphogypsum or calcium sulfate; Step 2, Micro powder treatment: Use a crushing and grinding machine (10) to crush and grind phosphogypsum or calcium sulfate to prepare phosphogypsum micro powder and calcium sulfate micro powder. Step 3, Screening: Use a screening machine (9) to screen the phosphogypsum powder or calcium sulfate powder; Step 4, Modification and Calcination: Calcination modification of phosphogypsum powder or calcium sulfate powder is carried out using a calcination furnace (14) to obtain modified phosphogypsum powder and modified calcium sulfate powder. Step 5, Mixing and Preparation: Use a mixer (12) to mix the dewatering agent raw materials evenly to prepare industrial sludge dewatering agent and domestic sludge dewatering agent; Step 6, Packaging and Storage: Use a packaging machine (13) to package the industrial sludge dewatering agent and the domestic sludge dewatering agent.

2. The method for preparing sludge dewatering agent using modified phosphogypsum according to claim 1, characterized in that: The industrial sludge dewatering agent comprises modified phosphogypsum powder, PAC, and ferrous sulfate, wherein the modified phosphogypsum powder accounts for 50% by weight. The composition of the sewage sludge dewatering agent includes modified calcium sulfate powder, aluminum sulfate and ferrous sulfate, wherein the modified calcium sulfate powder accounts for 50% by weight.

3. The method for preparing sludge dewatering agent using modified phosphogypsum according to claim 1, characterized in that: The calcining furnace (14) includes a furnace body (1), a discharge mechanism (2), a calcining cylinder (3), a feeding mechanism, and an electric heater (5). The discharge mechanism (2) is located at the bottom of the furnace body (1). The calcining cylinder (3) is located inside the furnace body (1) via a rotating mechanism. The calcining cylinder (3) is located inside a turning mechanism. The electric heater (5) is located inside the furnace body (1) below the calcining cylinder (3). The temperature sensor is located inside the furnace body (1) above the calcining cylinder (3). The feeding mechanism is located at the top of the furnace body (1). An annular protrusion (35) is located in the middle of the outer side of the calcining cylinder (3). The annular protrusion (35) is equipped with a calcining mechanism. The furnace tube (3) is connected to the inlet and outlet (36). The furnace body (1) has an annular sealing platform (24) in the middle of its inner wall. The top of the annular protrusion (35) is fitted to the outer surface of the furnace tube (3). The annular sealing platform (24) has an annular sealing groove. The annular protrusion (35) is located in the annular sealing groove of the annular sealing platform (24). A sealing mechanism is provided between the annular sealing platform (24) and the annular protrusion (35). The furnace body (1) has a support base (8) at the bottom. The furnace body (1) has an inlet corresponding to the inlet and outlet (36) at the top. The furnace body (1) has an outlet corresponding to the inlet and outlet (36) at the bottom.

4. The method for preparing sludge dewatering agent using modified phosphogypsum according to claim 3, characterized in that: The discharge mechanism (2) includes a corner cylinder (21), a discharge plate (22) and a sealing seat (23). A corner cylinder (21) is provided on one side of the bottom outlet of the furnace body (1) through an installation plate. The output end of the corner cylinder (21) is connected to the discharge plate (22) through a piston rod. A sealing seat (23) is provided on the top of the discharge plate (22).

5. The method for preparing sludge dewatering agent using modified phosphogypsum according to claim 3, characterized in that: The rotating mechanism includes a rotating disk (31), a first gear (32), a second gear (33), and a servo motor (34). One end of the calcining cylinder (3) is provided with a rotating disk (31), which is rotatably connected to the furnace body (1) via a rotating shaft. The other end of the calcining cylinder (3) is provided with a first gear (32), which is rotatably connected to the furnace body (1) via a gear shaft. The furnace body (1) above the first gear (32) is provided with a second gear (33) via a gear shaft. The first gear (32) and the second gear (33) are meshed together. The upper part of one side of the furnace body (1) is provided with a servo motor (34) via a motor mount. The output end of the servo motor (34) is connected to the gear shaft of the second gear (33) via a reducer.

6. The method for preparing sludge dewatering agent using modified phosphogypsum according to claim 5, characterized in that: The material turning mechanism includes a material turning rod (4) and a material turning plate (41). The material turning rod (4) is provided in the middle of the calcining cylinder (3). The material turning rod (4) is connected to the furnace body (1) through a through hole through the rotating disk (31) and the first gear (32). The material turning plate (41) is provided on the material turning rod (4) through a connecting rod.

7. The method for preparing sludge dewatering agent using modified phosphogypsum according to claim 3, characterized in that: The feeding mechanism includes a feeding hopper (6), a feeding cylinder (61), a feeding plate (62), a feeding port (63), a feeding motor (64), and an electric telescopic rod (65). The feeding hopper (6) is located above the furnace body (1). The bottom of the feeding hopper (6) is connected to the feeding cylinder (61). The upper part of the inner side of the feeding cylinder (61) is connected to the feeding plate (62) through a connecting shaft. The upper part of one side of the feeding cylinder (61) is connected to the feeding motor (64) through a motor seat. The output end of the feeding motor (64) is connected to the connecting shaft on one side of the feeding plate (62) through a reducer. The top of the furnace body (1) is provided with a feeding port (63) connected to the inlet. The bottom of the feeding cylinder (61) is located inside the feeding port (63). The top of the furnace body (1) on both sides opposite to the feeding port (63) is provided with an electric telescopic rod (65) through a mounting plate. The output end of the top of the electric telescopic rod (65) is connected to the feeding hopper (6) through a connecting seat.

8. The method for preparing sludge dewatering agent using modified phosphogypsum according to claim 3, characterized in that: The sealing mechanism includes a sealing groove (25), a limiting groove (26), a sealing pressure ring (27), and a limiting ring (28). The top of the annular sealing platform (24) is provided with a sealing groove (25), and the inner side of the annular sealing platform (24) is provided with a limiting groove (26) of annular structure. The annular protrusion (35) is provided with a sealing pressure ring (27) on the outside of the calcining cylinder (3) on both sides opposite to it. The sealing pressure ring (27) is located inside the sealing groove (25). The annular protrusion (35) is provided with a limiting ring (28) of annular structure on both sides opposite to it. The limiting ring (28) is located inside the limiting groove (26).

9. The method for preparing sludge dewatering agent using modified phosphogypsum according to claim 3, characterized in that: The calcining cylinder (3) is a conical cylinder with a convex middle and two conical ends, and blades (7) are provided on the outside of the calcining cylinder (3).

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