Phosphate rock comprehensive utilization forming system

Abstract

This utility model discloses a comprehensive phosphate ore utilization forming system, including a pretreatment unit, a pelletizing unit, a roasting unit, a closed-loop dust removal unit, and a controller connected in sequence to the electrical control components in each unit. The units are connected through a sealed pipeline. The pretreatment unit includes a raw material silo, a drying component, and a grading and grinding component. The pelletizing unit includes a mixing tank, a pelletizing component, a driving component, and a feeding component. The roasting unit includes a vibrating screening component, a feeding component, and a roasting component. The closed-loop dust removal unit includes a pulse jet bag filter, a collection box, and a dust suction branch pipe. This utility model achieves efficient conversion and clean production of phosphate ore through a fully sealed design of pretreatment, pelletizing, roasting, and dust removal. It solves the problems of difficult phosphate ore recovery and high pollution, and improves the quality of pellet products and production safety.

Description

Technical Field

[0001] This utility model relates to the field of phosphorus chemical processing technology, specifically to a molding system for the comprehensive utilization of phosphate ore. Background Technology

[0002] Phosphate ore has various uses, and producing pellets is one of the more widespread applications. Fine-grained ore is agglomerated into spherical shapes through physical pelletizing, and then the internal particles of the pellets are bonded together through high-temperature roasting, ultimately forming high-strength, uniformly sized pellets to meet the needs of subsequent phosphate ore processing or smelting.

[0003] The existing technology and equipment for pelletizing phosphate rock powder have the following shortcomings:

[0004] ① Traditional ball mills require low moisture content when grinding phosphate rock powder, but the powder itself is hygroscopic. Under open-air storage conditions, the moisture content of phosphate rock powder is much higher than the requirements for dry grinding, which can cause the ball mill to clog and fail to produce stable output. In addition, traditional ball mills have certain requirements for particle size, but there are a large number of particles in phosphate rock powder that exceed the requirements, which leads to increased grinding time and poor grinding effect.

[0005] ② Existing pelletizing devices generate a lot of debris during the pelletizing process. This debris tends to accumulate in the gaps between the guide rods, affecting the discharge. At the same time, the debris is inconvenient to collect and recycle, and manual collection is not only inefficient but also prone to pollution.

[0006] ③ The production process of phosphate rock powder into pellets generates a large amount of dust, which seriously affects product yield and worker health. Moreover, although some existing processing systems have dust removal units, they cannot achieve true airtightness, posing a possibility of dust explosion. For large-scale industrial installations, the safety is insufficient. Summary of the Invention

[0007] To address the problems in the background technology, this utility model provides a comprehensive phosphate ore forming system that can improve the quality of pelletized ore products and production safety.

[0008] This application adopts the following technical solution: a phosphate ore comprehensive utilization molding system, including a pretreatment unit, a pelletizing unit, a roasting unit, a closed-loop dust removal unit, and a controller connected to the electrical control components in each unit in sequence, and each unit is connected through a closed pipeline.

[0009] The pretreatment unit includes a raw material silo, a drying component, and a grading and grinding component. The raw material silo adopts a sealed structure and has a built-in humidity sensor to monitor the moisture content of the phosphate rock powder in real time. A vibrating discharge device is installed at the outlet to prevent the raw material from caking. The drying component is located below the raw material silo and uses a spiral drum dryer with feeding at one end and discharging at the other end to reduce the moisture content of the phosphate rock powder until it meets the requirements of the grinding process. The grading and grinding component includes a ball mill and a screening machine. The dried phosphate rock powder enters the ball mill for grinding, and the screening machine adopts a linear multi-stage vibrating screen. The qualified phosphate rock powder after screening is sent to the pelletizing unit.

[0010] The pelletizing unit includes a mixing tank, a pelletizing assembly, a driving assembly, and a feeding assembly. The mixing tank has a feed inlet on the upper side wall and a discharge outlet at the bottom, with a star-shaped unloader installed on the discharge outlet.

[0011] The briquetting assembly includes a briquetting box and a briquetting roller assembly. The briquetting box is located below the mixing tank, and its inlet is connected to the outlet of the rotary valve. The briquetting roller assembly is installed inside the briquetting box and located below the outlet of the rotary valve. It consists of a fixed roller and a sliding roller, which are two relatively parallel rollers with hemispherical concave dies on their surfaces. The fixed roller is located on the left side inside the briquetting box, and its two ends are positioned and connected to the front and rear side walls of the briquetting box through bearing seats. The main shaft of the fixed roller extends out of the rear side of the briquetting box. The sliding roller is located on the right side inside the briquetting box, and its two ends are positioned and connected to the front and rear side walls of the briquetting box through bearing seats and horizontally arranged guide rails. The main shaft of the sliding roller also extends out of the rear side of the briquetting box. A groove for accommodating the sliding of the main shaft is provided on the rear side of the briquetting box.

[0012] The drive assembly includes a drive motor, a reducer, a gear transfer case, and a hydraulic cylinder. The drive motor is located on the rear side of the ball pressing box and connected to the box body. The reducer is connected to the output shaft of the drive motor, and the gear transfer case is connected to the output shaft of the reducer. The gear transfer case has two output shafts, which are respectively connected to the main shafts of the fixed pressure roller and the sliding pressure roller through universal couplings. The cylinder body of the hydraulic cylinder is installed on the right side of the ball pressing box, and its piston rod is inserted into the ball pressing box. The front end of the piston rod is connected to the bearing seat of the sliding pressure roller through a spherical bearing, pushing the sliding pressure roller to move towards the fixed side pressure roller for pressing.

[0013] The material guiding assembly includes a buffer chamber and a material guiding pipe. The top surface of the buffer chamber is connected to the discharge port on the bottom surface of the briquetting box, and a buffer plate is installed inside the chamber. One end of the buffer plate is connected to the chamber wall through a rotating shaft. The plate is inclined downwards, and a buffer spring seat is installed between the bottom of the plate and the chamber wall. The material guiding pipe is a square tube structure. Its interior is divided into a pellet chamber and a debris chamber by a partition with drop holes along its length. The inner corners of each chamber are rounded, and the inner sidewall is provided with a smooth and wear-resistant coating. The two ends of the material guiding pipe are the feed end and the discharge end, respectively. The feed end is provided with a feed pipe connected to the pellet chamber, and the discharge end is provided with discharge pipes connected to the pellet chamber and the debris chamber, respectively. The material guiding pipe is located below the buffer chamber. The feed pipe at its feed end is connected to the bottom of the buffer chamber, and its discharge end is inclined downwards.

[0014] The roasting unit includes a vibrating screening assembly, a feeding assembly, and a roasting assembly. The vibrating screening assembly includes a screen box, a vibrating motor assembly, and a collection box. A screen mesh is installed inside the screen box, and the mesh aperture is smaller than the diameter of the pellets. The vibrating motor assembly consists of two vibrating motors, which are respectively installed on the outer walls of the screen box on the left and right sides of the screen mesh. The two vibrating motors are arranged in parallel and opposite directions, and the two motors rotate synchronously in opposite directions. The centrifugal force generated by their eccentric blocks cancels each other out in the direction parallel to the motor axis and superimposes in the direction perpendicular to the motor axis, thereby causing the screen mesh to generate a linear, forward-throwing vibration trajectory that drives the pellets forward. The inlet of the discharge pipe of the screen box is located below the discharge end of the screen mesh, and the upper side of the sealing cover of the inlet end has an inlet port, which is connected to the discharge pipe of the pellet chamber of the guide pipe. The collection box is located below the screen box, with its top sealed to the bottom surface of the screen box and its side connected to the discharge pipe of the debris chamber of the guide pipe.

[0015] The feeding assembly is an inclined belt conveyor. The height of the cross diaphragm on the conveyor belt is greater than the radius of the pellets. The conveyor belt is fitted with a sealing sleeve around its perimeter. The inner wall of the sealing sleeve is connected to the frame of the conveyor via a connecting rod. The discharge pipe of the screen box enters and exits the sealing cover, and the pipe opening is located above the feeding point of the conveyor belt. The discharge pipe is installed on the sealing cover below the unloading point of the conveyor.

[0016] The roasting assembly includes a rotary kiln, on which a chute is installed and connected to the discharge pipe of an inclined belt conveyor. A collection trough is provided at the discharge point of the rotary kiln.

[0017] The closed-loop dust removal unit includes a pulse-jet bag filter, a collection box, and suction branch pipes. The filter bags in the pulse-jet bag filter have conductive wires woven into their fibers to prevent static electricity buildup and sparks. The bottom of the collection box has a ash discharge port, and the side has an air outlet. The air outlet is connected to the dust inlet of the pulse-jet bag filter through a tapered pipe. Multiple air inlets are provided on the surface opposite the air outlet. Each air inlet is welded with a standard flange and has an electric air volume regulating valve installed inside. There are multiple suction branch pipes, one end of which is connected to the air inlet of the collection box, and the other end is connected to the upper space of dust-generating points such as vibrating discharge device, screening machine, mixing tank, briquetting box, and screen box, for collecting suspended dust.

[0018] Preferably, in order to prevent turbulent airflow and increased resistance inside the manifold, an arc-shaped guide plate is installed inside the manifold opposite to the air inlet to guide the airflow to turn smoothly and reduce turbulence and kinetic energy loss.

[0019] Preferably, in order to scrape off residual material on the surface of the pressure roller, a scraper is installed in the ball-pressing box below the fixed pressure roller and the sliding pressure roller, respectively. The scraper is made of polyurethane or tungsten carbide, and its cutting edge is in close contact with the surface of the pressure roller.

[0020] Beneficial effects: ①. This utility model achieves efficient conversion and clean production of phosphate ore through a closed-loop design of pretreatment, pelletizing, roasting and dust removal. It not only solves the problems of difficult recovery and high pollution of phosphate ore, but also improves the quality of pellet products and production safety.

[0021] ②. In this utility model, the pretreatment unit solves the problems of ball mill blockage and low grinding efficiency caused by high moisture and large particle raw materials through "pre-drying + pre-vibration", providing high-quality raw materials with uniform particle size and stable moisture for subsequent processes, and ensuring the continuous, stable and efficient operation of the entire production line.

[0022] ③. The pelletizing unit in this utility model uses a fully enclosed smooth guide pipe to replace the traditional guide rod, eliminating jamming points. A scraper is installed below the pressure roller to actively remove residual powder and debris. With this double protection, it ensures that green pellets and debris can leave the pelletizing area quickly, solving the problem of downtime caused by jamming. Moreover, the pelletizing box is directly connected to the sealed vibrating screen box through the guide pipe. Qualified green pellets and debris are automatically separated and collected, eliminating raw material waste. More importantly, it realizes clean production in the pelletizing workshop and reduces dust pollution and health hazards caused by manual cleaning.

[0023] ④. This utility model's closed-loop dust removal unit physically seals off all dust-generating points (crushing, conveying, screening, pelletizing, etc.) to prevent dust escape, reducing the risk of dust explosion—the most dangerous aspect of large-scale industrial equipment—to an extremely low level, minimizing safety hazards, and greatly improving the working environment. Simultaneously, all collected phosphate rock powder dust can be recycled and reused in production, directly increasing the overall product yield and achieving a high degree of unity between environmental and economic benefits. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] Figure 2 This is a schematic diagram of the internal structure of the medium-pressure ball box of this utility model.

[0026] Figure 3 for Figure 2 A top-view structural diagram.

[0027] Figure 4 This is a schematic diagram of the internal structure of the feed tube in this utility model.

[0028] Figure 5 This is a schematic diagram of the connection structure between the feed pipe and the screen box in this utility model.

[0029] In the diagram: 1. Raw material silo; 2. Vibrating discharge device; 3. Spiral drum dryer; 4. Ball mill; 5. Screening machine; 6. Mixing tank; 7. Rotary rotary valve; 8. Pelletizing box; 9. Fixed pressure roller; 10. Sliding pressure roller; 11. Drive motor; 12. Reducer; 13. Gearbox; 14. Hydraulic cylinder; 15. Buffer silo; 16. Guide pipe; 17. Pelletizing chamber; 18. Debris chamber; 19. Buffer plate; 20. Vibrating motor unit; 21. Screen box; 22. Collection box; 23. Rotary kiln; 24. Pulse jet bag filter; 25. Collection box; 26. Dust suction branch pipe; 27. Scraper; 28. Inclined belt conveyor. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to specific embodiments.

[0031] Example 1

[0032] like Figure 1-5 As shown, this embodiment discloses a phosphate ore comprehensive utilization molding system, including a pretreatment unit, a pelletizing unit, a roasting unit, a closed-loop dust removal unit, and a controller connected in sequence to the electrical control components in each unit, and each unit is connected through a closed pipeline.

[0033] See Figure 1The pretreatment unit includes a raw material silo 1, a drying component, and a grading and grinding component. The raw material silo 1 adopts a sealed structure and has a built-in humidity sensor to monitor the moisture content of the phosphate rock powder in real time. A vibrating discharge device 2 is installed at the outlet to prevent the raw material from caking. The drying component is located below the raw material silo 1 and uses a spiral drum dryer 3 with feeding at one end and discharging at the other end to reduce the moisture content of the phosphate rock powder until it meets the requirements of the grinding process. The grading and grinding component includes a ball mill 4 and a screening machine 5. The dried phosphate rock powder enters the ball mill 4 for grinding, and the screening machine 5 adopts a linear multi-stage vibrating screen. The qualified phosphate rock powder after screening is sent to the pelletizing unit.

[0034] See Figure 1 The pelletizing unit includes a mixing tank 6, a pelletizing assembly, a driving assembly, and a feeding assembly. The mixing tank 6 has a feed inlet on the upper side wall and a discharge outlet at the bottom, with a star-shaped unloader 7 installed on the discharge outlet.

[0035] See Figure 1 and Figure 2 The briquetting assembly includes a briquetting box 8 and a briquetting roller assembly. The briquetting box 8 is located below the mixing tank 6, and its inlet is connected to the outlet of the star-shaped unloader 7. The briquetting roller assembly is installed inside the briquetting box 8 and located below the outlet of the star-shaped unloader 7. It consists of a fixed roller 9 and a sliding roller 10. The fixed roller 9 and the sliding roller 10 are two relatively parallel rollers with hemispherical concave dies on their surfaces. The fixed roller 9 is located on the left side inside the briquetting box 8, and its two ends are positioned and connected to the front and rear side walls of the briquetting box 8 through bearing seats. The main shaft of the fixed roller 9 extends out of the rear side of the briquetting box 8. The sliding roller 10 is located on the right side inside the briquetting box 8, and its two ends are positioned and connected to the front and rear side walls of the briquetting box 8 through bearing seats and horizontally arranged guide rails. The main shaft of the sliding roller 10 also extends out of the rear side of the briquetting box 8. A groove for accommodating the sliding of the main shaft is provided on the rear side of the briquetting box 8.

[0036] See Figure 3 The drive assembly includes a drive motor 11, a reducer, a gearbox 13, and a hydraulic cylinder 14. The drive motor 11 is located on the rear side of the ball pressing box 8 and connected to the box body. The reducer is connected to the output shaft of the drive motor 11. The gearbox 13 is connected to the output shaft of the reducer. The gearbox 13 has two output shafts, which are respectively connected to the main shafts of the fixed pressure roller 9 and the sliding pressure roller 10 through universal couplings. The cylinder body of the hydraulic cylinder 14 is installed on the right side of the ball pressing box 8. Its piston rod passes into the ball pressing box 8. The front end of the piston rod is connected to the bearing seat of the sliding pressure roller 10 through a spherical bearing, pushing the sliding pressure roller 10 to move and squeeze towards the fixed side pressure roller.

[0037] See Figure 4The feeding assembly includes a buffer chamber 15 and a feeding pipe 16. The top surface of the buffer chamber 15 is connected to the discharge port on the bottom surface of the briquetting box 8, and a buffer plate 19 is installed inside the chamber. One end of the buffer plate 19 is connected to the chamber wall via a rotating shaft. The plate is inclined downwards, and a buffer spring seat is installed between the bottom of the plate and the chamber wall. The feeding pipe 16 is a square tube structure, and its interior has a partition with drop holes along its length, which divides it into a pellet chamber 17 and a debris chamber. The inner corners of each chamber 18 are rounded, and the inner sidewalls are coated with a smooth and wear-resistant coating. The two ends of the guide pipe 16 are the feed end and the discharge end, respectively. The feed end is provided with a feed pipe that is connected to the pellet chamber 17, and the discharge end is provided with discharge pipes that are connected to the pellet chamber 17 and the debris chamber 18, respectively. The guide pipe 16 is located below the buffer chamber 15, and its feed end is connected to the bottom of the buffer chamber 15, while its discharge end is inclined downwards.

[0038] See Figure 1 The roasting unit includes a vibrating screening assembly, a feeding assembly, and a roasting assembly. The vibrating screening assembly includes a screen box 21, a vibrating motor assembly 20, and a collection box 22. A screen mesh is installed inside the screen box 21, and the mesh aperture is smaller than the diameter of the pellets. The vibrating motor assembly 20 consists of two vibrating motor assemblies 20, which are respectively installed on the outer walls of the screen box 21 on the left and right sides of the screen mesh. The two vibrating motors are arranged in parallel and opposite directions, and rotate synchronously in opposite directions. The centrifugal force generated by their eccentric blocks is parallel to the motor axis. The directions cancel each other out and superimpose in the direction perpendicular to the motor axis, thereby causing the screen to generate a straight, forward-throwing vibration trajectory that drives the pellets forward. The inlet of the discharge pipe of the screen box 21 is located below the discharge end of the screen. The upper side of the sealing cover of the inlet end has an inlet, which is connected to the discharge pipe of the pellet chamber 17 of the guide pipe 16. The collection box 22 is set below the screen box 21. Its top is sealed and connected to the bottom surface of the screen box 21, and its side is connected to the discharge pipe of the debris chamber 18 of the guide pipe 16.

[0039] See Figure 1 The feeding assembly is an inclined belt conveyor 28. The height of the cross diaphragm on the conveyor belt is greater than the radius of the pellet. The conveyor belt is fitted with a sealing sleeve around its perimeter. The inner wall of the sealing sleeve is connected to the frame of the conveyor through a connecting rod. The discharge pipe of the screen box 21 enters and exits the sealing cover, and the pipe opening is located above the feeding point of the conveyor belt. The discharge pipe is installed on the sealing cover below the discharging point of the conveyor.

[0040] The roasting assembly includes a rotary kiln 23, on which a chute is installed, and the chute is connected to the discharge pipe of the inclined belt conveyor 28. A collection trough is provided at the discharge point of the rotary kiln 23.

[0041] See Figure 1The closed-loop dust removal unit includes a pulse jet bag filter 24, a collection box 25, and suction branch pipes 26. The filter bag fibers in the pulse jet bag filter 24 are woven with conductive wires to prevent static electricity accumulation and sparks. The bottom surface of the collection box 25 is equipped with a dust discharge port, and the side surface has an air outlet. The air outlet is connected to the dust and gas inlet of the pulse jet bag filter 24 through a tapered pipe. Multiple air inlets are opened on the surface opposite to the air outlet. Each air inlet is welded with a standard flange, and an electric air volume regulating valve is also installed inside the air inlet. There are multiple suction branch pipes 26. One end is connected to the air inlet of the collection box 25, and the other end is connected to the upper space of the dust-generating points such as the vibrating discharge device 2, the screening machine 5, the mixing tank 6, the briquetting box 8, and the screen box 21, for collecting suspended dust.

[0042] Example 2

[0043] The specific structure and implementation method are shown in Example 1, except that: an arc-shaped guide plate is installed in the collection box 25 at the position opposite to the air inlet to guide the airflow to turn smoothly and reduce turbulence and kinetic energy loss.

[0044] See Figure 2 Scrapers 27 are installed in the ball-pressing box 8 below the fixed pressure roller 9 and the sliding pressure roller 10 respectively. The scrapers 27 are made of polyurethane or tungsten carbide, and their cutting edges are in close contact with the surface of the pressure roller.

[0045] A vibrator is installed on the bottom surface of the feed pipe 16 to prevent debris and dust from accumulating on the inner wall of the pipe.

[0046] During operation, the phosphate rock powder in the raw material silo 1 is fed into the spiral drum dryer through the vibrating feeding device 2. Inside the drum, the material undergoes sufficient heat exchange. The phosphate rock powder is continuously lifted and scattered by the lifting plates inside the drum, forming a uniform material. The moisture is quickly evaporated and carried away, bringing the discharge moisture content to the range required by the ball mill 4. Then, the raw material enters the ball mill 4, where it begins to be ground. Due to the low moisture content and uniform particle size of the raw material, the grinding efficiency is extremely high, and it can be quickly ground into phosphate rock powder of the required fineness. The powder is then stably discharged through the discharge grate, avoiding adhesion and blockage.

[0047] The pretreated qualified phosphate rock powder is thoroughly and evenly mixed with a quantitatively added binder and water in the mixing tank 6 to form a pelletizing material with a certain plasticity. Then, it enters the pelletizing box 8 between two pressure rollers. The two pressure rollers have hemispherical concave dies and rotate at the same speed but in opposite directions. When the material enters the biting zone, under the action of strong roller pressure, the material in the two concave dies is squeezed and squeezed to overcome its internal cohesion and form dense spherical green pellets. The formed pellets and the generated debris fall from the gap between the pressure rollers and first enter the buffer chamber 15. After being buffered by the buffer plate 19, the pellets enter the pellet chamber 17 and are discharged into the screen box 21. The debris falls into the debris chamber 18 through the holes in the partition and then enters the collection box 22. All materials slide smoothly down the smooth inclined surface without the risk of jamming.

[0048] When the pellets enter the sealed screen box 21, the two vibrating motors rotate synchronously in opposite directions. The centrifugal force generated by their eccentric blocks cancels each other out in the direction parallel to the motor axis and superimposes in the direction perpendicular to the motor axis, thereby causing the screen to generate a straight, forward-throwing vibration trajectory that drives the pellets forward. Qualified green pellets are screened out as oversize material and sent to the rotary kiln 23 by the inclined belt conveyor 28 for high-temperature heat treatment, which causes the green pellets to undergo physical and chemical changes, resulting in finished pellets with high strength and good metallurgical properties. The debris and powder fall into the collection box 22 at the bottom as undersize material.

[0049] The closed-loop dust removal unit captures dust generated during the entire production process, purifies the air, and recovers the dust to ensure safety and cleanliness.

Claims

1. A phosphate rock comprehensive utilization forming system, comprising a pretreatment unit, a pelletizing unit, a roasting unit, a closed-loop dust removal unit, and a controller connected in sequence to the electrical control components within each unit, wherein each unit is interconnected via a sealed pipeline; characterized in that: The pretreatment unit includes a raw material silo (1), a drying component, and a grading and grinding component. The raw material silo (1) adopts a sealed structure and has a built-in humidity sensor to monitor the moisture content of the phosphate rock powder in real time. A vibrating discharge device (2) is set at the outlet to prevent the raw material from caking. The drying component is set below the raw material silo (1) and adopts a spiral drum dryer (3) with one end feeding and the other end discharging to reduce the moisture content of the phosphate rock powder until it meets the requirements of the grinding process. The grading and grinding component includes a ball mill (4) and a screening machine (5). The dried phosphate rock powder enters the ball mill (4) for grinding. The screening machine (5) adopts a linear multi-stage vibrating screen. The qualified phosphate rock powder after screening is sent to the pelletizing unit. The closed-loop dust removal unit includes a pulse jet bag filter (24), a collection box (25), and a suction branch pipe (26). The filter bag fibers in the pulse jet bag filter (24) are woven with conductive wires to prevent static electricity accumulation and sparks. The bottom surface of the collection box (25) is equipped with a ash discharge port, and the side surface has an air outlet. The air outlet is connected to the dust inlet of the pulse jet bag filter through a tapered pipe. Multiple air inlets are opened on the surface opposite to the air outlet. Each interface is welded with a standard flange, and an electric air volume regulating valve is installed inside the interface. There are multiple suction branch pipes (26). One end is connected to the air inlet of the collection box (25), and the other end is connected to the upper space of the dust generation point of the vibrating material discharge device (2), the screening machine (5), the mixing tank (6), the briquetting box (8), and the screen box (21) to collect suspended dust.

2. The phosphate rock comprehensive utilization molding system according to claim 1, characterized in that: The pelletizing unit includes a mixing tank (6), a pelletizing assembly, a driving assembly and a feeding assembly. The mixing tank (6) has a feed inlet on the upper side wall and a discharge outlet at the bottom. A star-shaped unloader (7) is installed on the discharge outlet. The briquetting assembly includes a briquetting box (8) and a briquetting roller assembly. The briquetting box (8) is located below the mixing tank (6), and its inlet is connected to the outlet of the star-shaped unloader (7). The briquetting roller assembly is installed inside the briquetting box (8) and located below the outlet of the star-shaped unloader (7). It consists of a fixed roller (9) and a sliding roller (10). The fixed roller (9) and the sliding roller (10) are two rollers arranged relatively parallel to each other and with hemispherical concave dies on their surfaces. The fixed roller (9) is located below the mixing tank (6). The ball box (8) is located on the left side, and its two ends are connected to the front and rear side walls of the ball box (8) through bearing seats. The main shaft near the fixed pressure roller (9) extends out of the rear side of the ball box (8). The sliding pressure roller (10) is located on the right side of the ball box (8). Its two ends are connected to the front and rear side walls of the ball box (8) through bearing seats and horizontally arranged guide rails. The main shaft near the fixed pressure roller (9) also extends out of the rear side of the ball box (8). A groove for accommodating the sliding of the main shaft is provided on the rear side of the ball box (8). The drive assembly includes a drive motor (11), a reducer (12), a gear transfer box (13), and a hydraulic cylinder (14). The drive motor (11) is located on the rear side of the ball pressing box (8) and connected to the box body. The reducer (12) is connected to the output shaft of the drive motor (11). The gear transfer box (13) is connected to the output shaft of the reducer (12). The gear transfer box (13) has two output shafts, which are connected to the main shafts of the fixed pressure roller (9) and the sliding pressure roller (10) respectively through universal couplings. The cylinder body of the hydraulic cylinder (14) is installed on the right side of the ball pressing box (8). Its piston rod is inserted into the ball pressing box (8). The front end of the piston rod is connected to the bearing seat of the sliding pressure roller (10) through a joint bearing, pushing the sliding pressure roller (10) to move and squeeze towards the fixed side pressure roller. The material guiding assembly includes a buffer chamber (15) and a material guiding pipe (16). The top surface of the buffer chamber (15) is connected to the discharge port on the bottom surface of the briquetting box (8), and a buffer plate (19) is installed inside the chamber. One end of the buffer plate (19) is connected to the chamber wall through a rotating shaft. The plate is inclined downwards, and a buffer spring seat is installed between the bottom of the plate and the chamber wall. The material guiding pipe (16) is a square tube structure. Its interior has a partition with drop holes along its length, which divides it into a pellet chamber (17) and a debris chamber. The inner corners of each chamber (18) are rounded, and the inner sidewall is provided with a smooth and wear-resistant coating. The two ends of the guide pipe (16) are the feed end and the discharge end, respectively. The feed end is provided with a feed pipe that is connected to the pellet chamber (17), and the discharge end is provided with a discharge pipe that is connected to the pellet chamber (17) and the debris chamber (18), respectively. The guide pipe (16) is located below the buffer chamber (15), and the feed pipe at its feed end is connected to the bottom of the buffer chamber (15), and its discharge end is inclined downward.

3. The phosphate rock comprehensive utilization molding system according to claim 1, characterized in that: The roasting unit includes a vibrating sieving assembly, a feeding assembly, and a roasting assembly. The vibrating sieving assembly includes a sieve box (21), a vibrating motor assembly (20), and a collection box (22). A sieve screen is installed inside the sieve box (21), and the aperture of the sieve screen is smaller than the diameter of the pellets. The vibrating motor assembly (20) consists of two vibrating motor assemblies (20), which are respectively installed on the outer wall of the sieve box (21) on the left and right sides of the sieve screen. The two vibrating motors are arranged in parallel and opposite directions, and the two motors rotate synchronously in opposite directions. The centrifugal force generated by their eccentric blocks is parallel to the motor axis. The two forces cancel each other out and superimpose in a direction perpendicular to the motor axis, thereby causing the screen to generate a straight, forward-throwing vibration trajectory that drives the pellets forward. The inlet of the discharge pipe of the screen box (21) is located below the discharge end of the screen. The upper side of the sealing cover of the feed end has a feed port and is connected to the discharge pipe of the pellet chamber (17) of the guide pipe (16). The collection box (22) is set below the screen box (21). Its top is sealed and connected to the bottom surface of the screen box (21), and its side is connected to the discharge pipe of the debris chamber (18) of the guide pipe (16). The feeding assembly is an inclined belt conveyor (28). The height of the cross diaphragm on the conveyor belt is greater than the radius of the pellet. The conveyor belt is fitted with a sealing sleeve around its perimeter. The inner wall of the sealing sleeve is connected to the frame of the conveyor through a connecting rod. The discharge pipe of the screen box (21) enters and exits the sealing cover, and the pipe opening is located above the feeding point of the conveyor belt. The discharge pipe is installed on the sealing cover below the discharging point of the conveyor. The roasting assembly includes a rotary kiln (23), on which a chute is installed at the feed inlet and is connected to the discharge pipe of the inclined belt conveyor (28). A collection trough is provided at the discharge point of the rotary kiln (23).

4. The phosphate rock comprehensive utilization molding system according to claim 1, characterized in that: An arc-shaped guide plate is installed inside the collection box (25) at a position opposite to the air inlet to guide the airflow to turn smoothly and reduce turbulence and kinetic energy loss.

5. The phosphate rock comprehensive utilization molding system according to claim 2, characterized in that: Scrapers (27) are installed in the ball-pressing box (8) below the fixed pressure roller (9) and the sliding pressure roller (10), respectively. The scrapers (27) are made of polyurethane or tungsten carbide, and their cutting edges are in close contact with the surface of the pressure roller.

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