Method and device for producing fertilizer from phosphorite flotation tailings

Abstract

The invention discloses a method and device for producing fertilizer from phosphorite flotation tailings, and relates to the technical field of fertilizer production from tailings, the device comprises a machine body, the top of the machine body is provided with a crushing cavity, the bottom of the crushing cavity is provided with a crushing cavity, and a connecting pipe is arranged between the crushing cavity and the crushing cavity; a crushing assembly is arranged in the crushing cavity, and a crushing assembly is arranged in the crushing cavity; the sintered and drained tailing mixture is conveyed into the crushing cavity through the feeding port, the crushing assembly performs crushing treatment on the tailing mixture, the large tailing mixture is crushed into small blocks, then the small blocks are conveyed into the smashing assembly through the connecting pipe and ground into powder in the smashing assembly, and the fertilizer is formed. By conveying the high-pressure steam, the fertilizer ground into powder is separated from the tailing mixture which is not ground completely, and heat of the high-pressure steam is transferred into the crushing cavity to dry the tailing mixture in the crushing cavity.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizer production from tailings, in particular to a method for producing fertilizer from phosphate rock flotation tailings and a device thereof. Background Art

[0002] The phosphate rock resources required for the production of high-concentration fertilizers can be obtained not only from directly using rich phosphate rock but also from flotation of medium- and low-grade phosphate rock tailings and high-magnesium phosphate rock. These phosphate rocks typically account for 20% to 30% of the total flotation ore, and phosphate rock tailings are usually stored in the form of tailings slurry. However, with the rapid development of the high-concentration phosphate fertilizer industry both domestically and internationally, the accumulation of phosphate rock tailings has caused increasing environmental pollution. At the same time, during the mining process, companies often mine rich phosphate rock and discard low-grade phosphate rock, resulting in a large amount of low-grade phosphate rock wasted. The existing production of fertilizers from phosphate tailings requires the tailings to be processed first, and then the tailings mixture is sintered, water quenched, drained, dried and crushed into powder. During the drying process, since the tailings mixture appears in large blocks after sintering, a lot of time is consumed in the draining and drying stages, resulting in an increase in the subsequent fertilizer production process and time, thereby affecting the efficiency of fertilizer production. Summary of the Invention

[0003] The object of the present invention is to provide a method and device for producing fertilizer from phosphate rock flotation tailings, so as to solve the problems raised in the prior art.

[0004] To achieve the above object, the present invention provides the following technical solutions: A fertilizer production device for phosphate rock flotation tailings includes a body, a crushing chamber is provided on the top of the body, a pulverizing chamber is provided at the bottom of the crushing chamber, a connecting pipe is provided between the crushing chamber and the pulverizing chamber, a feed port is provided on the top of the crushing chamber, a crushing assembly is provided inside the crushing chamber, and a pulverizing assembly is provided inside the pulverizing chamber.

[0005] The tailings mixture that has been sintered and drained is transported to the crushing chamber through the feed port. In the crushing chamber, the controller controls the crushing assembly to crush the tailings mixture, breaking the large pieces of tailings mixture into small pieces. The crushed tailings mixture is then transported to the crushing assembly through the connecting pipe, where it is ground into powder to form fertilizer. During the crushing process, high-pressure steam is transported to separate the ground fertilizer from the unground tailings mixture, and the heat of the high-pressure steam can be transferred to the crushing chamber to dry the tailings mixture in the crushing chamber.

[0006] Preferably, the crushing assembly includes several movable grooves, which are located between two adjacent feed ports. A transmission shaft is provided in the movable groove, a slider is provided on the transmission shaft, an extrusion column is provided at the bottom of the slider, and the slider and the extrusion column are slidably connected to the movable groove.

[0007] The slider moves under the rotation of the drive shaft. During the reciprocating motion of the slider along the drive shaft, the slider drives the extrusion column to move. When the extrusion column moves to the side away from the crushing roller, the tailings mixture is transported from the feed port to the crushing chamber. When the extrusion column moves to the side close to the crushing roller, the tailings mixture will move between the two adjacent extrusion columns and the crushing roller, so that the two extrusion columns and the crushing roller squeeze the tailings mixture.

[0008] Preferably, a driven gear is provided at one end of the transmission shaft away from the inner wall of the body, two spiral grooves are provided on the shaft wall of the transmission shaft, the two spiral grooves rotate in opposite directions, and the slider is slidably connected to the transmission shaft through the spiral grooves.

[0009] When the driving gear rotates, it drives the driven gear to rotate, and then the driven gear drives the transmission shaft to rotate. During the rotation of the transmission shaft, since there are two spiral grooves on the shaft wall, and the rotation directions of the two spiral grooves are opposite, when the driven gear drives the transmission shaft to rotate in one direction, the slider can reciprocate along the axis of the transmission shaft under the action of the two spiral grooves, without the need to drive the motor to switch between forward and reverse directions, thereby improving the operating efficiency.

[0010] Preferably, a driving gear is provided between several of the driven gears, the driven gears are meshed with the driving gears for transmission, a driving motor is provided on the top of the body, the driving shaft of the driving motor is connected to the driving gear, a crushing roller is provided at the bottom of the driven gear, and the crushing roller is in contact with the surfaces of several extrusion columns.

[0011] Before the tailings mixture is put into the machine body, the controller controls the drive motor to drive. The drive shaft of the drive motor drives the drive gear to rotate. The driving gear drives the crushing roller to rotate during the rotation. At this time, the crushing roller is in a self-rotating state. While the drive gear rotates, it also meshes with the driven gear. Then the drive gear drives the driven gear to rotate, thereby driving the transmission shaft to rotate. The squeezing column moves back and forth along the transmission shaft, so that the squeezing column continuously moves away from and close to the crushing roller. When the squeezing column moves close to the crushing roller, the tailings mixture is pushed by the two squeezing columns, pushing the tailings mixture toward the crushing roller, and then the crushing roller and the squeezing column cooperate with each other to extrude and crush the tailings mixture. At the same time, the crushing roller is in a self-rotating state, so that the tailings mixture is also in friction contact with the crushing roller. Under the squeezing action of the crushing roller and the squeezing column, and the friction contact of the crushing roller, the tailings mixture is broken from large blocks into small blocks, thereby achieving the effect of crushing the tailings mixture.

[0012] Preferably, a transition chamber is provided on one side of the crushing chamber close to the connecting pipe, a support frame is provided in the transition chamber, a plurality of the extrusion columns are slidingly connected to the top of the support frame, and the crushing roller is rotatably connected to the top of the support frame.

[0013] Preferably, the crushing assembly includes a crushing disk, which is located in a crushing chamber. The bottom of the crushing disk and the bottom of the crushing chamber are both provided with grinding grooves. The crushing disk is rotatably connected to the crushing chamber. A crushing motor is provided at the bottom of the crushing chamber, and the drive shaft of the crushing motor is connected to the crushing disk.

[0014] The small-piece tailings mixture is transported to the connecting pipe through the transition chamber, and then transported to the crushing chamber through the connecting pipe. When the tailings mixture enters the crushing chamber, the driving shaft of the crushing motor drives the crushing disk to rotate. When the crushing disk rotates, the tailings mixture on the top of the crushing disk is transported from the center of the crushing disk to the edge of the crushing disk. Then the tailings mixture falls between the crushing disk and the crushing chamber. Since the bottom of the crushing disk and the bottom of the crushing chamber are both provided with grinding grooves, the small pieces of tailings mixture are crushed into powder under the joint action of the crushing disk and the crushing chamber, thus forming fertilizer.

[0015] Preferably, an air delivery cavity is provided inside the crushing disk, and a plurality of air inlets and a plurality of air outlets are provided in the air delivery cavity. A steam cavity is provided outside the body, and an air pump is provided in the steam cavity. The air pump is connected to the air inlet through a pipeline, and the air outlet is connected to the air delivery cavity and the crushing cavity.

[0016] During the crushing process of the crushing disk, the controller controls the air pump to start, and the air pump extracts the high-pressure steam in the steam chamber and transports it to the air inlet through the pipeline. Then the high-pressure steam is transported to the air transmission chamber through the air inlet, and then transported to the air outlet through the air transmission chamber, and then transported to the space between the crushing disk and the crushing chamber from the air outlet. The high-pressure steam blows the crushed powder through the space between the crushing disk and the crushing chamber, while the tailings mixture that has not formed powder will not be blown by the high-pressure steam, and will continue to be crushed in the crushing chamber.

[0017] Preferably, the diameter of the connecting pipe near the crushing chamber is smaller than the diameter of the connecting pipe near the crushing chamber, a channel is provided in the middle of the support frame, a cavity is provided in the crushing roller, and several steam ports are provided on the roller wall of the crushing roller.

[0018] A portion of the high-pressure steam is transported to the side close to the connecting pipe. After the high-pressure steam is transported to the connecting pipe, the diameter of the connecting pipe close to the crushing chamber is smaller than the diameter of the connecting pipe close to the crushing chamber, so that the flow cross-section of the high-pressure steam in the connecting pipe is reduced, thereby causing the temperature of the high-pressure steam to rise. Subsequently, the high-pressure steam is transported to the cavity through the channel on the support frame, and finally transported to the crushing chamber through several steam ports. At this time, the tailings mixture is squeezed between the crushing roller and the two extrusion columns, and the ejected high-pressure steam directly acts on its surface, thereby subjecting it to high-temperature drying treatment. The crushing roller and the two extrusion columns extrude and crush the tailings mixture, further increasing the contact area between the tailings mixture and the high-pressure steam, thereby further improving the drying quality of the tailings mixture, and completing the drying effect of the tailings mixture during the extrusion and crushing process, thereby saving steps and improving the efficiency of fertilizer production.

[0019] Preferably, a storage chamber is provided between two adjacent moving grooves, a discharge pipe is provided between the storage chamber and the crushing chamber, and the discharge pipe is arranged along the tangent direction of the crushing chamber. The storage chamber temporarily stores and outputs the crushed fertilizer.

[0020] A portion of the high-pressure steam mixed with the powder is transported from the crushing chamber to the discharge pipe, and then transported to the storage chamber through the discharge pipe, so that the crushed powder is separated from the uncrushed tailings mixture, thereby avoiding the tailings mixture and the powder being discharged together, thereby improving the crushing quality of the tailings mixture. The powder is temporarily stored in the storage chamber and finally transported out of the storage chamber; Since high-pressure steam is transported to the storage chamber, the heat of the high-pressure steam is transferred to the storage chamber, and the feed port is located at the top of the storage chamber, the tailings mixture located at the feed port will be subject to heat transfer from the storage chamber, and the tailings mixture is preheated when entering the machine body, thereby improving the drying efficiency and saving the drying time of the tailings mixture.

[0021] A production method of a fertilizer production device using phosphate rock flotation tailings, The production method comprises the following specific steps: S1, the tailings mixture moves through the feed port to the side close to the crushing chamber; S2, the tailings mixture is crushed by the squeeze column and crushing roller in the crushing chamber; S3, the crushed tailings mixture is transported to the crushing chamber through the connecting pipe; S4, the tailings mixture is crushed by the crushing disk in the crushing chamber; S5. During the crushing process, high-pressure steam separates the powder and provides heat to dry the tailings mixture.

[0022] Compared with the prior art, the present invention has the following beneficial effects: 1. The distance between the crushing roller and the two extrusion columns is shortened, so that the tailings mixture is squeezed and crushed. In addition, the crushing roller is in friction contact with the surface of the tailings mixture under the action of self-rotation, so that the preliminary crushing of the tailings mixture is completed under the mutual cooperation of extrusion crushing and friction crushing.

[0023] 2. While the crushing chamber is crushing the small pieces of tailings mixture, high-pressure steam is rushed into the crushing chamber, so that the high-pressure steam drives the ground powder to separate the unground tailings mixture, thereby avoiding the tailings mixture and the powder being output together, resulting in poor grinding quality of the tailings mixture.

[0024] 3. While the crushing roller is crushing the tailings mixture, a large amount of high-pressure steam is input into the cavity and directly ejected through several steam ports. In addition, the crushing roller is squeezing and crushing the tailings mixture at this time, so that the ejected steam is directly sprayed onto the crushed tailings mixture, thereby achieving the effect of drying the tailings mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A perspective view of the present invention; Figure 2 Schematic diagram of the internal structure of the present invention; Figure 3 It is an internal front view of the present invention; Figure 4 is a cross-sectional view of the present invention; Figure 5 It is a structural diagram of the moving groove, transmission shaft and slider; Figure 6 It is a schematic diagram of the structure of the squeeze column and the crushing roller; Figure 7 for Figure 4 Enlarged view of point A in the middle; In the figure: 1, machine body; 11, crushing chamber; 12, crushing chamber; 13, connecting pipe; 14, feed port; 15, transition chamber; 16, support frame; 2. Crushing assembly; 21. Moving trough; 22. Transmission shaft; 221. Spiral groove; 23. Slider; 24. Extrusion column; 25. Driven gear; 26. Drive gear; 27. Crushing roller; 28. Cavity; 29. ​​Steam outlet; 3. Crushing assembly; 31. Crushing disc; 32. Air delivery cavity; 33. Air inlet; 34. Air outlet; 35. Storage cavity; 36. Discharge pipe. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Example: Figure 1-Figure 7 As shown, the present invention provides a technical solution for a fertilizer production device from phosphate rock flotation tailings, comprising a body 1, a crushing chamber 11 being provided at the top of the body 1, a pulverizing chamber 12 being provided at the bottom of the crushing chamber 11, a connecting pipe 13 being provided between the crushing chamber 11 and the pulverizing chamber 12, a feed port 14 being provided at the top of the crushing chamber 11, a crushing assembly 2 being provided inside the crushing chamber 11, and a pulverizing assembly 3 being provided inside the pulverizing chamber 12; The diameter of the connecting tube 13 at one end close to the pulverizing chamber 12 is smaller than the diameter of the connecting tube 13 at one end close to the crushing chamber 11 .

[0028] As a specific embodiment of the present invention, the crushing assembly 2 includes several movable grooves 21, the movable groove 21 is located between two adjacent feed ports 14, a transmission shaft 22 is provided in the movable groove 21, a slider 23 is provided on the transmission shaft 22, and an extrusion column 24 is provided at the bottom of the slider 23, and the slider 23 and the extrusion column 24 are slidably connected to the movable groove 21.

[0029] As a specific embodiment of the present invention, a driven gear 25 is provided at one end of the transmission shaft 22 away from the inner wall of the body 1, and two spiral grooves 221 are provided on the shaft wall of the transmission shaft 22. The two spiral grooves 221 have opposite rotation directions, and the slider 23 is slidingly connected to the transmission shaft 22 through the spiral groove 221.

[0030] As a specific embodiment of the present invention, a driving gear 26 is arranged between several of the driven gears 25, and the driven gear 25 is meshed with the driving gear 26 for transmission. A driving motor is provided on the top of the body 1, and the driving shaft of the driving motor is connected to the driving gear 26. A crushing roller 27 is provided at the bottom of the driven gear 25, and the crushing roller 27 is in contact with the surfaces of several extrusion columns 24.

[0031] As a specific embodiment of the present invention, a transition chamber 15 is provided on the side of the crushing chamber 11 close to the connecting pipe 13, and a support frame 16 is provided in the transition chamber 15. Several of the extrusion columns 24 are slidingly connected to the top of the support frame 16, and the crushing roller 27 is rotatably connected to the top of the support frame 16.

[0032] As a specific embodiment of the present invention, a channel is provided in the middle of the support frame 16 , a cavity 28 is provided in the crushing roller 27 , and a plurality of steam ports 29 are provided on the roller wall of the crushing roller 27 .

[0033] As a specific embodiment of the present invention, the crushing assembly 3 includes a crushing disc 31, which is located in the crushing chamber 12. The bottom of the crushing disc 31 and the bottom of the crushing chamber 12 are both provided with grinding patterns. The crushing disc 31 is rotatably connected to the crushing chamber 12. A crushing motor is provided at the bottom of the crushing chamber 12, and the drive shaft of the crushing motor is connected to the crushing disc 31.

[0034] As a specific embodiment of the present invention, an air delivery chamber 32 is provided inside the pulverizing disc 31, and a plurality of air inlets 33 and a plurality of air outlets 34 are provided in the air delivery chamber 32. A steam chamber is provided outside the body 1, and an air pump is provided in the steam chamber. The air pump is connected to the air inlet 33 through a pipeline, and the air outlet 34 is connected to the air delivery chamber 32 and the pulverizing chamber 12.

[0035] As a specific embodiment of the present invention, a storage chamber 35 is provided between two adjacent moving grooves 21, and a discharge pipe 36 is provided between the storage chamber 35 and the crushing chamber 12. The discharge pipe 36 is arranged along the tangential direction of the crushing chamber 12. The storage chamber 35 temporarily stores and outputs the crushed fertilizer.

[0036] A production method of a fertilizer production device using phosphate rock flotation tailings, The production method comprises the following specific steps: S1, the tailings mixture moves through the feed port 14 to the side close to the crushing chamber 11; S2, the tailings mixture is crushed by the squeeze column 24 and the crushing roller 27 in the crushing chamber 11; S3, the crushed tailings mixture is transported to the crushing chamber 12 through the connecting pipe 13; S4, the tailings mixture is crushed by the crushing disk 31 in the crushing chamber 12; S5. During the crushing process, high-pressure steam separates the powder and provides heat to dry the tailings mixture.

[0037] Working principle of the present invention: Before the tailings mixture is put into the machine body 1, the controller controls the driving motor to drive, and the driving shaft of the driving motor drives the driving gear 26 to rotate. During the rotation of the driving gear 26, the crushing roller 27 is driven to rotate. At this time, the crushing roller 27 is in a self-rotating state. While the driving gear 26 rotates, it also meshes with the driven gear 25. Then, the driving gear 26 drives the driven gear 25 to rotate, thereby driving the transmission shaft 22 to rotate; When the driving gear 26 rotates, it drives the driven gear 25 to rotate, and then the driven gear 25 drives the transmission shaft 22 to rotate. During the rotation of the transmission shaft 22, since two spiral grooves 221 are provided on the shaft wall, and the rotation directions of the two spiral grooves 221 are opposite, when the driven gear 25 drives the transmission shaft 22 to rotate in one direction, the slider 23 can reciprocate along the axis of the transmission shaft 22 under the action of the two spiral grooves 221, without the need for the drive motor to switch between forward and reverse directions; The slider 23 moves under the rotation of the transmission shaft 22. During the reciprocating motion of the slider 23 along the transmission shaft 22, the slider 23 drives the squeezing column 24 to move. When the squeezing column 24 moves to the side away from the crushing roller 27, the tailings mixture is transported from the feed port 14 to the crushing chamber 11. When the squeezing column 24 moves to the side close to the crushing roller 27, the tailings mixture moves between two adjacent squeezing columns 24 and the crushing roller 27, so that the two squeezing columns 24 and the crushing roller 27 squeeze the tailings mixture. The squeezing column 24 reciprocates along the transmission shaft 22, so that the squeezing column 24 continuously moves away from and approaches the crushing roller 27. When the squeezing column 24 moves close to the crushing roller 27, the tailings mixture is pushed by the two squeezing columns 24, pushing the tailings mixture toward the crushing roller 27. Then, the crushing roller 27 cooperates with the squeezing column 24 to squeeze and crush the tailings mixture. At the same time, the crushing roller 27 is in a self-rotating state, so that the tailings mixture is also in frictional contact with the crushing roller 27. As a result, the tailings mixture is crushed from large lumps into small lumps under the squeezing action of the crushing roller 27 and the squeezing column 24, as well as the frictional contact of the crushing roller 27. The small-sized tailings mixture is transported to the connecting pipe 13 through the transition chamber 15, and then transported to the crushing chamber 12 through the connecting pipe 13. After the tailings mixture enters the crushing chamber 12, the drive shaft of the crushing motor drives the crushing disc 31 to rotate. When the crushing disc 31 rotates, the tailings mixture on the top of the crushing disc 31 is transported from the center of the crushing disc 31 to the edge of the crushing disc 31. The tailings mixture then falls between the crushing disc 31 and the crushing chamber 12. Because the bottom of the crushing disc 31 and the bottom of the crushing chamber 12 are both provided with grinding grooves, the small-sized tailings mixture is crushed into powder by the combined action of the crushing disc 31 and the crushing chamber 12, thereby forming fertilizer. During the pulverizing process of the pulverizing disk 31, the controller starts the air pump, which extracts the high-pressure steam in the steam chamber and delivers it to the air inlet 33 through the pipeline. The high-pressure steam is then delivered to the air delivery chamber 32 through the air inlet 33, and then delivered to the air outlet 34 through the air delivery chamber 32. The high-pressure steam is delivered to the space between the pulverizing disk 31 and the pulverizing chamber 12 through the air outlet 34. The high-pressure steam blows the pulverized powder through the space between the pulverizing disk 31 and the pulverizing chamber 12, while the tailings mixture that has not yet formed into powder will not be blown by the high-pressure steam and will continue to be pulverized in the pulverizing chamber 12. A portion of the high-pressure steam is transported to the side close to the connecting pipe 13. After the high-pressure steam is transported to the connecting pipe 13, the diameter of the connecting pipe 13 close to the crushing chamber 12 is smaller than the diameter of the connecting pipe 13 close to the crushing chamber 11, so that the flow cross-section of the high-pressure steam in the connecting pipe 13 is reduced, thereby causing the temperature of the high-pressure steam to rise. Subsequently, the high-pressure steam is transported to the cavity 28 through the channel on the support frame 16, and finally transported to the crushing chamber 11 through a plurality of steam ports 29. At this time, the tailings mixture is squeezed between the crushing roller 27 and the two squeezing columns 24, and the ejected high-pressure steam directly acts on its surface, thereby subjecting it to high-temperature drying treatment. The crushing roller 27 and the two squeezing columns 24 squeeze and crush the tailings mixture, further increasing the contact area between the tailings mixture and the high-pressure steam, thereby further improving the drying quality of the tailings mixture, and the drying effect of the tailings mixture is completed in the process of squeezing and crushing. Another portion of high-pressure steam mixed with powder is transported from the pulverizing chamber 12 to the discharge pipe 36, and then transported to the storage chamber 35 through the discharge pipe 36, so that the pulverized powder is separated from the unpulverized tailings mixture, thereby avoiding the tailings mixture and the powder being discharged together, thereby improving the quality of the tailings mixture pulverization. The powder is temporarily stored in the storage chamber 35 and finally transported out of the storage chamber 35; Since the high-pressure steam is transported to the storage chamber 35, the heat of the high-pressure steam is transferred to the storage chamber 35, and the feed port 14 is located at the top of the storage chamber 35, the tailings mixture located at the feed port 14 is subjected to the heat transfer from the storage chamber 35, and the tailings mixture is preheated when entering the machine body 1.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A fertilizer production device for phosphate rock flotation tailings, characterized by: The invention comprises a machine body (1), wherein a crushing chamber (11) is provided at the top of the machine body (1), a pulverizing chamber (12) is provided at the bottom of the crushing chamber (11), a connecting pipe (13) is provided between the crushing chamber (11) and the pulverizing chamber (12), a feed port (14) is provided at the top of the crushing chamber (11), a crushing assembly (2) is provided inside the crushing chamber (11), and a pulverizing assembly (3) is provided inside the pulverizing chamber (12).

2. The device for producing fertilizer from phosphate rock flotation tailings according to claim 1, characterized in that: The crushing assembly (2) comprises a plurality of movable grooves (21), wherein the movable grooves (21) are located between two adjacent feed ports (14), a transmission shaft (22) is provided in the movable grooves (21), a slider (23) is provided on the transmission shaft (22), an extrusion column (24) is provided at the bottom of the slider (23), and the slider (23) and the extrusion column (24) are slidably connected to the movable grooves (21).

3. The fertilizer production device for phosphate rock flotation tailings according to claim 2, characterized in that: A driven gear (25) is provided at one end of the transmission shaft (22) away from the inner wall of the machine body (1); two spiral grooves (221) are provided on the shaft wall of the transmission shaft (22); the two spiral grooves (221) rotate in opposite directions; and the slider (23) is slidably connected to the transmission shaft (22) via the spiral grooves (221).

4. The device for producing fertilizer from phosphate rock flotation tailings according to claim 3, characterized in that: A driving gear (26) is provided between the plurality of driven gears (25), and the driven gears (25) and the driving gears (26) are meshed and driven. A driving motor is provided on the top of the machine body (1), and a driving shaft of the driving motor is connected to the driving gear (26). A crushing roller (27) is provided at the bottom of the driven gear (25), and the crushing roller (27) is in surface contact with the plurality of extrusion columns (24).

5. The device for producing fertilizer from phosphate rock flotation tailings according to claim 6, characterized in that: A transition chamber (15) is provided on one side of the crushing chamber (11) close to the connecting pipe (13), a support frame (16) is provided in the transition chamber (15), a plurality of the squeezing columns (24) are slidably connected to the top of the support frame (16), and the crushing roller (27) is rotatably connected to the top of the support frame (16).

6. The device for producing fertilizer from phosphate rock flotation tailings according to claim 5, characterized in that: The pulverizing assembly (3) comprises a pulverizing disc (31), the pulverizing disc (31) being located in a pulverizing chamber (12), the bottom of the pulverizing disc (31) and the bottom of the pulverizing chamber (12) both being provided with grinding grooves, the pulverizing disc (31) being rotatably connected to the pulverizing chamber (12), a pulverizing motor being provided at the bottom of the pulverizing chamber (12), and a drive shaft of the pulverizing motor being connected to the pulverizing disc (31).

7. The device for producing fertilizer from phosphate rock flotation tailings according to claim 6, characterized in that: An air delivery cavity (32) is provided inside the pulverizing disk (31), and a plurality of air inlets (33) and a plurality of air outlets (34) are provided in the air delivery cavity (32). A steam cavity is provided outside the machine body (1), and an air pump is provided in the steam cavity. The air pump is connected to the air inlet (33) through a pipeline, and the air outlet (34) is connected to the air delivery cavity (32) and the pulverizing cavity (12).

8. The device for producing fertilizer from phosphate rock flotation tailings according to claim 7, characterized in that: The diameter of the connecting pipe (13) at one end close to the crushing chamber (12) is smaller than the diameter of the connecting pipe (13) at one end close to the crushing chamber (11). A passage is provided in the middle of the support frame (16). A cavity (28) is provided in the crushing roller (27). A plurality of steam ports (29) are provided on the roller wall of the crushing roller (27).

9. The device for producing fertilizer from phosphate rock flotation tailings according to claim 8, characterized in that: A storage chamber (35) is provided between two adjacent moving grooves (21), a discharge pipe (36) is provided between the storage chamber (35) and the crushing chamber (12), and the discharge pipe (36) is arranged along the tangent direction of the crushing chamber (12). The storage chamber (35) temporarily stores and outputs the crushed fertilizer.

10. A method for producing fertilizer from phosphate rock flotation tailings according to any one of claims 1 to 9, characterized in that: The production method comprises the following specific steps: S1, the tailings mixture moves through the feed port (14) to the side close to the crushing chamber (11); S2, the tailings mixture is crushed in the crushing chamber (11) by the squeeze column (24) and the crushing roller (27); S3, the crushed tailings mixture is transported to the crushing chamber (12) through the connecting pipe (13); S4, the tailings mixture is crushed by the crushing disk (31) in the crushing chamber (12); S5. During the crushing process, high-pressure steam separates the powder and provides heat to dry the tailings mixture.

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