Improved mixing device for producing silicon fertilizer from mine tailings

Abstract

The invention discloses an improved mixing device for producing a silicon fertilizer from mine tailing slag in the technical field of tailing slag utilization, the improved mixing device comprises a rotary drum granulator, a vibration screening machine and a returned material conveying mechanism, the rotary drum granulator comprises a water vapor input hole, and a hole diameter adjusting unit is arranged at the water vapor input hole; the returned material conveying mechanism comprises a returned material conveying belt and a conveying stranding cage unit; the conveying stranding cage unit is used for conveying excess materials on the returned material conveying belt to the rotary drum granulator; a weight sensing assembly is arranged in the conveying auger unit and drives the aperture adjusting unit to adjust the aperture size of the water vapor input hole. The water content at the feeding port of the rotary drum granulator can be adjusted in real time according to the size of granules discharged by the rotary drum granulator; the water content at the feeding port is reduced when a large amount of particles are discharged, and the water content at the feeding port is increased when a large amount of particles are discharged, so that the discharging size of the whole rotary drum granulator is uniform.

Description

Technical Field

[0001] The invention relates to the technical field of tailings utilization, in particular to an improved mixing device for producing silicon fertilizer from mine tailings. Background Art

[0002] The use of mine tailings to prepare silicon fertilizer can effectively recycle mine tailings, reduce environmental pressure, and reduce the harm of iron tailings. At the same time, the prepared silicon fertilizer can be used as a fertilizer to provide nutrients, and can also be used as a soil conditioner to improve the soil. It has broad application prospects.

[0003] At present, in the production process, the tailings after grinding and selection need to be filtered and mechanically mixed with humic acid in a drum granulator according to the corresponding mass ratio, and the particles of suitable size are vibrated and screened out as silicon fertilizer. However, in the specific granulation process, the particles mixed and manufactured by the drum granulator often have waste materials that are too large or too small, which requires the staff to adjust so that the size of the mixed granulated particles is appropriate; at the same time, the waste materials of inappropriate size are screened out and put back into the drum granulator for reprocessing, which is bound to affect the original particle size of the drum granulator again, requiring the staff to frequently adjust manually. Therefore, an improved mixing device for producing silicon fertilizer from mine tailings is needed to solve the above problems. Summary of the invention

[0004] The technical problem of the present invention is to provide an improved mixing device for producing silicon fertilizer from mine tailings. The present invention can adjust the water content at the feed port of the drum granulator in real time according to the particle size of the drum granulator; the present invention first screens out materials with larger particles and materials with smaller particles through a double-layer vibration screening machine, and then transports them to the drum granulator for reprocessing, and weighs them respectively during the transportation process; the present invention determines the amount of the screened waste by weighing when transporting it, reduces the water content at the feed port when more larger particles are discharged, and increases the water content at the feed port when more smaller particles are discharged, so that the discharge size of the entire drum granulator is uniform.

[0005] The present invention provides the following technical solution: a device for improving and mixing silicon fertilizer produced from mine tailings, comprising a rotary drum granulation mechanism, a vibration screening mechanism and a return material conveying mechanism.

[0006] The rotary drum granulation mechanism comprises a rotary drum granulator fixedly mounted on a frame, the two ends of the rotary drum granulator are respectively a feed inlet and a discharge outlet, a water vapor input hole is arranged at one end of the rotary drum granulator close to the discharge outlet, and an aperture adjustment unit is arranged at the water vapor input hole;

[0007] The vibrating screening mechanism is arranged at the discharge port, the vibrating screening mechanism is a double-layer vibrating screening machine, and the outlet end of the double-layer vibrating screening machine is provided with a large particle outlet, a medium particle outlet and a small particle outlet;

[0008] The return material conveying mechanism includes a return material conveying belt and a conveying cage unit with an external independent driving source; the return material conveying belt includes a large particle conveying channel, a medium particle conveying channel and a small particle conveying channel, and a collecting box is arranged at the medium particle conveying channel; two groups of the conveying cage units are respectively arranged at one end of the large particle conveying channel and the small particle conveying channel close to the feeding port, and the conveying cage unit is used to convey the residual material on the return material conveying belt to the feeding port; a weight sensing component is arranged in the conveying auger unit, and the weight sensing component drives the aperture adjustment unit to adjust the aperture size of the water vapor input hole.

[0009] As a further solution of the present invention, the aperture adjustment unit includes an annular pipe rotatably mounted on the side wall of the rotary drum granulator, the inner wall of the annular pipe is connected to the water vapor input hole, and the outer wall of the annular pipe is connected to the gas pipeline; a first closing plate and a second closing plate are slidably mounted on the side wall of the annular pipe along the axial direction of the annular pipe, and the first closing plate and the second closing plate jointly close the water vapor input hole; the first closing plate and the second closing plate are respectively connected to the weight sensing components in the two groups of the conveying auger units.

[0010] As a further solution of the present invention, the conveying auger unit includes a body fixedly mounted on a frame, the upper end of the body is provided with a discharge channel pointing to the feed port, the lower end of the body is provided with a feed channel pointing to the return conveyor belt, and a spiral shaft with blades is sleeved in the body; the weight sensing component includes a base plate fixedly mounted on the lower end of the spiral shaft, and a first spring is provided between the base plate and the body; the upper end of the spiral shaft extends to the outside of the body, and the upper end of the spiral shaft is hinged to the first closing plate and the second closing plate respectively through a hinge rod.

[0011] As a further solution of the present invention, the return material conveyor belt includes a conveying roller with an external independent driving source, the conveying roller is fixedly mounted on a driving shaft, the driving shaft is connected to the screw shaft through a speed regulating unit, and the speed regulating unit adjusts the rotation speed of the screw shaft according to the weight of the weight sensing component.

[0012] As a further solution of the present invention, the speed regulation unit includes a rotating shaft rotatably mounted on a frame, the rotating shaft being vertically arranged to the spiral shaft; the rotating shaft and the driving shaft are synchronously connected through a synchronous belt; a first friction wheel is also key-connectedly mounted on the rotating shaft, a second spring is arranged between the first friction wheel and the frame; a second friction wheel is fixedly mounted on the spiral shaft, and the first friction wheel and the second friction wheel are frictionally connected.

[0013] As a further solution of the present invention, the water vapor input holes are arranged at annular intervals on the side wall of the rotary drum granulator.

[0014] As a further solution of the present invention, it is characterized in that: the gas pipeline transports water vapor with a temperature of 50 to 80 degrees Celsius.

[0015] As a further solution of the present invention, the rotary drum granulator is driven by a first motor, and sensors are installed on the first motor and the weight sensing component. The first motor controls the rotation speed according to the weight information transmitted by the weight sensing unit.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention can adjust the moisture content at the feed inlet of the rotary drum granulator in real time according to the particle size of the rotary drum granulator; the present invention first screens out materials with larger particles and materials with smaller particles respectively through a double-layer vibrating screening machine, and then transports them to the rotary drum granulator for reprocessing, and weighs them respectively during the transportation process; the present invention determines the amount of the screened waste by weighing when transporting it, reduces the moisture content at the feed inlet when more larger particles are discharged, and increases the moisture content at the feed inlet when more smaller particles are discharged, so that the discharge size of the entire rotary drum granulator is uniform.

[0018] 2. The weight sensing unit of the present invention utilizes the weight change of the waste entering the conveying auger unit to change the height of the screw shaft itself, and then drives the first closing plate and the second closing plate to move through the hinged rod, adjusts the aperture size of the water vapor input hole, and changes the water content at the feed inlet. The structure is simple and easy to use.

[0019] 3. The present invention utilizes the weighing action of the weight sensing unit to not only drive the aperture adjustment unit to adjust the aperture size of the water vapor input hole, but also to change the rotation speed of the screw shaft, so that the conveying auger unit can automatically adjust its own conveying speed according to the actual amount of waste. When there is a lot of waste, the rotation speed of the screw shaft is automatically increased to increase the conveying speed and avoid piling up of the return material conveyor belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is the overall structure diagram of a device for improving and mixing silicon fertilizer produced from mine tailings;

[0022] Figure 2 It is a schematic diagram of the structure of the mixing device of the present invention when it is half-cut;

[0023] Figure 3 For the present invention Figure 2 A partial enlarged view of part A;

[0024] Figure 4 This is a schematic diagram of the structure of the mixing device of the present invention without the rotary drum granulator;

[0025] Figure 5 For the present invention Figure 4 A partial enlarged view of part B;

[0026] Figure 6 It is a schematic structural diagram of the conveying cage unit of the present invention.

[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0028] 11-drum granulator, 12-feeding port, 13-discharging port, 14-steam input hole, 15-double-layer vibration screening machine, 16-large particle outlet, 17-medium particle outlet, 18-small particle outlet, 19-return conveyor belt, 21-large particle conveying channel, 22-medium particle conveying channel, 23-small particle conveying channel, 24-collecting box, 31-annular pipeline, 32-gas pipeline, 33-first closing plate, 34-second closing plate, 41-machine body, 42-discharging channel, 43-feeding channel, 44-screw shaft, 45-bottom plate, 46-first spring, 47-hinged rod, 51-conveying roller, 52-driving shaft, 53-rotating shaft, 54-synchronous belt, 55-first friction wheel, 56-second spring, 57-second friction wheel, 61-first motor. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-6 The present invention provides a device for improving and mixing silicon fertilizer produced from mine tailings, including a rotary drum granulator 11, a vibration screening mechanism and a return material conveying mechanism.

[0031] The drum granulator 11 structure includes a drum granulator 11 fixedly mounted on a frame, wherein the two ends of the drum granulator 11 are respectively provided with a feed inlet 12 and a discharge outlet 13, and a water vapor input hole is provided at one end of the drum granulator 11 close to the discharge outlet 13, and an aperture adjustment unit is provided at the water vapor input hole 14;

[0032] The vibrating screening mechanism is arranged at the discharge port 13, and the vibrating screening mechanism is a double-layer vibrating screening machine 15, and the outlet end of the double-layer vibrating screening machine 15 is provided with a large particle outlet 16, a medium particle outlet 17 and a small particle outlet 18;

[0033] The return material conveying mechanism includes a return material conveying belt 19 with an external independent driving source and a conveying cage unit; the return material conveying belt 19 includes a large particle conveying channel 20, a medium particle conveying channel 21 and a small particle conveying channel 22, and a collecting box 23 is arranged at the medium particle conveying channel 21; two groups of the conveying cage units are respectively arranged at one end of the large particle conveying channel 20 and the small particle conveying channel 22 close to the feed port 12, and the conveying cage unit is used to convey the residual material on the return material conveying belt to the feed port 12; a weight sensing component is arranged in the conveying auger unit, and the weight sensing component drives the aperture adjustment unit to adjust the aperture size of the water vapor input hole 14.

[0034] The moisture content of the material at the feed inlet 12 of the rotary drum granulator 11 of the present invention has a significant impact on the granulation effect when it is working. Too much moisture will lead to overly large particles, while too little moisture will lead to overly small particles. Therefore, controlling the moisture content of the material is the key to ensuring that the particles are of appropriate size. Figure 1 , Figure 2As shown, the present invention can adjust the water content at the feed port 12 of the drum granulator 11 in real time according to the pellet size of the drum granulator 11. The working process of the present invention is as follows: the material enters from the feed port 12 of the rotary drum granulator, and the external water vapor enters through the water vapor input hole 14 on the drum granulator 11 and mixes with the material for granulation. The produced particles leave from the discharge port 13 and fall into the double-layer vibrating screening machine 15 for screening. The screened materials enter the return conveyor belt 19 through the large particle outlet 16, the medium particle outlet 17 and the small particle outlet 18 respectively. Among them, the medium particles are qualified products and are directly transported to the collection box 23 for collection. The large particle waste and the small particle waste are then transported to the drum granulator 11 through the conveying cage unit for reprocessing, and they are weighed separately in this process. The quantity is determined by weighing. When there are many large-particle waste materials, the aperture of the water vapor input hole 14 is reduced through the aperture adjustment unit to reduce the water content at the feed inlet 12; when there are many small-particle waste materials, the aperture of the water vapor input hole 14 is increased through the aperture adjustment unit to increase the water content at the feed inlet 12, ultimately making the output size of the entire rotary drum granulator 11 uniform, avoiding frequent manual operations, and improving granulation efficiency.

[0035] As a further solution of the present invention, the aperture adjustment unit includes an annular pipe 31 rotatably mounted on the side wall of the rotary drum granulator 11, the inner wall of the annular pipe 31 is connected to the water vapor input hole, and the outer wall of the annular pipe 31 is connected to the gas pipeline 32; a first closing plate 33 and a second closing plate 34 are slidably mounted on the side wall of the annular pipe 31 along the axial direction of the annular pipe 31, and the first closing plate 33 and the second closing plate 34 jointly close the water vapor input hole; the first closing plate 33 and the second closing plate 34 are respectively connected to the weight sensing components in the two groups of the conveying auger units.

[0036] The specific working process of the aperture adjustment unit of the present invention is as follows: Figure 1 , Figure 3 As shown, in the present invention, the external water vapor first enters the annular pipe through the gas pipeline 32, and then the water vapor passes through the gap between the first seal and the second seal in the annular pipe, and finally enters the drum granulator 11 through the water vapor input hole 14. The present invention adjusts the moisture content in the drum granulator 11 by changing the size of the gap between the first seal and the second seal. Figure 3As shown, during operation, when there are more large-grain waste materials, the first closing plate 33 is driven by an external force to move to the right along the axial direction of the annular pipe 31, so that the gap between the first closing and the second closing is reduced, the amount of water vapor passing through is reduced, and the water content at the feed port 12 is reduced, so that the size of the granulated particles is reduced; when there are more small-grain waste materials, the second closing plate 34 is driven by an external force to move to the right along the axial direction of the annular pipe 31, so that the gap between the first closing and the second closing is increased, the amount of water vapor passing through is increased, the water content at the feed port 12 is increased, and the size of the granulated particles is increased. The present invention sets an annular pipe so that water vapor enters the rotary drum granulator 11 through the annular pipe. On the one hand, it is convenient to change the water content at the feed port 12 by changing the aperture size of the water vapor input hole 14; on the other hand, it is to prevent water vapor from diffusing and overflowing.

[0037] As a further solution of the present invention, the conveying auger unit includes a body 41 fixedly mounted on a frame, the upper end of the body 41 is provided with a discharge channel 42 pointing to the feed port 12, the lower end of the body 41 is provided with a feed channel 43 pointing to the return conveyor belt 19, and a spiral shaft 44 with blades is sleeved in the body 41; the weight sensing component includes a bottom plate 45 fixedly mounted on the lower end of the spiral shaft 44, and a first spring 46 is provided between the bottom plate 45 and the body 41; the upper end of the spiral shaft 44 extends to the outside of the body 41, and the upper end of the spiral shaft 44 is hinged to the first closing plate 33 and the second closing plate 34 respectively through a hinge rod 47.

[0038] The specific working process of the weight sensing component of the present invention is as follows: Figure 1 , Figure 4 As shown, the large waste particles and the small waste particles of the present invention are respectively transported to two conveying auger units through the large waste particle transport channel 20 and the small waste particle transport channel 22 on the return conveyor belt 19, as shown in FIG. Figure 6 As shown, the waste enters the machine body 41 through the feed channel 43, and is then transported to a high position by the rotation of the spiral shaft 44 with blades, and then leaves the conveying auger unit through the discharge channel 42 and falls into the feed port 12 of the rotary drum granulator 11 for further processing. When the waste is transported by the spiral shaft 44, the waste falls on the spiral shaft 44 with blades, and the weight of the waste drives the spiral shaft 44 to move downward. At this time, the first spring 46 is compressed by the bottom plate 45, and the height of the spiral shaft 44 decreases. Figure 1 As shown, the upper end of the spiral shaft 44 extends to the outside of the body 41, and the upper end of the spiral shaft 44 is hinged to the first closing plate 33 and the second closing plate 34 respectively through the hinge rod 47, and the upper end height of the spiral shaft 44 in the present invention is higher than the height of the first closing plate 33 and the second closing plate 34. Figure 1, Figure 3 As shown, when there are more large-grained waste materials, the height of the spiral shaft 44 is lowered, and the first closed plate 33 is driven to move to the right through the hinge shaft, so that the gap between the first closed and the second closed is reduced, the amount of water vapor passing through is reduced, and the water content at the feed inlet 12 is reduced, so that the size of the granulated particles is reduced; when there are more small-grained waste materials, the height of the spiral shaft 44 is lowered, and the second closed plate 34 is driven to move to the right through the hinge shaft, so that the gap between the first closed and the second closed is increased, the amount of water vapor passing through is increased, and the water content at the feed inlet 12 is increased, so that the size of the granulated particles is increased. The weight sensing unit of the present invention utilizes the weight change of the waste entering the conveying auger unit to change the height of the spiral shaft 44 itself, and then drives the first closed plate 33 and the second closed plate 34 to move through the hinge rod 47, adjusts the aperture size of the water vapor input hole 14, and changes the water content at the feed inlet 12. It has a simple structure and is easy to use.

[0039] As a further solution of the present invention, the return conveyor belt 19 includes a conveying roller 51 with an external independent driving source, and the conveying roller 51 is fixedly mounted on a driving shaft 52. The driving shaft 52 is connected to the screw shaft 44 through a speed regulating unit, and the speed regulating unit adjusts the rotation speed of the screw shaft 44 according to the weight of the weight sensing component.

[0040] As a further solution of the present invention, the speed regulation unit includes a rotating shaft 53 rotatably mounted on the frame, and the rotating shaft 53 is vertically arranged with the screw shaft 44; the rotating shaft 53 is synchronously driven connected with the drive shaft 52 through a synchronous belt 54; a first friction wheel 55 is also key-connectedly mounted on the rotating shaft 53, and a second spring 56 is arranged between the first friction wheel 55 and the frame; a second friction wheel 57 is fixedly mounted on the screw shaft 44, and the first friction wheel 55 is frictionally driven connected with the second friction wheel 57.

[0041] The present invention can also automatically adjust the conveying speed of the conveying auger unit. Figure 5 As shown, the conveying roller 51 of the present invention is externally connected to an independent driving source, the driving shaft 52 rotates and drives the rotating shaft 53 to rotate through the synchronous belt 54, and the first friction wheel 55 is key-connected and installed on the rotating shaft 53, so the first friction wheel 55 rotates with the rotating shaft 53. The first friction wheel 55 is connected to the second friction wheel 57 fixedly installed at the bottom end of the screw shaft 44 by friction transmission, so the second friction wheel 57 rotates and drives the screw shaft 44 to rotate and lift the waste. The specific process of adjusting the conveying speed of the conveying auger unit of the present invention is as follows: Figure 4 , Figure 5As shown, when the present invention is working, when more waste enters the body 41 through the feed channel 43, the distance that the screw shaft 44 descends increases, and the distance that the second friction wheel 57 fixed at the lower end of the screw shaft 44 descends also increases. At this time, the contact point between the second friction wheel 57 and the first friction wheel 55 moves downward. When the first friction wheel 55 keeps the same speed, the contact point between the second friction wheel 57 and the first friction wheel 55 moves downward, indicating that the linear speed of the contact point between the first friction wheel 55 and the second friction wheel 57 increases, so the speed of the second friction wheel 57 increases, the speed of the screw shaft 44 increases, and the conveying speed of the conveying auger unit increases. The present invention can use the weighing action of the weight sensing unit to change the speed of the screw shaft 44, so that the conveying auger unit can automatically adjust its own conveying speed according to the actual amount of waste, and automatically increase the speed of the screw shaft 44 when there is a lot of waste, so as to increase the conveying speed and avoid piling of the return conveyor belt 19.

[0042] As a further solution of the present invention, the water vapor input holes are arranged in annular intervals on the side wall of the rotary drum granulator 11. Figure 3 As shown, this arrangement is to ensure that when the drum granulator 11 rotates, there is always a water vapor input hole connected to the annular pipeline to facilitate the entry of water vapor.

[0043] As a further solution of the present invention, it is characterized in that: the gas pipeline 32 conveys water vapor with a temperature of 50 to 80 degrees Celsius. The suitable temperature range of drum granulation is between 50 and 80 degrees Celsius. Within this temperature range, the material can maintain appropriate viscosity and fluidity, which is conducive to the formation and stability of particles.

[0044] As a further solution of the present invention, the rotary drum granulator 11 is driven by a first motor 61, and sensors are installed on the first motor 61 and the weight sensing component. The first motor 61 controls the rotation speed according to the weight information transmitted by the weight sensing unit. The rotation speed of the rotary drum granulator 11 will directly affect the residence time and stress of the material in the cylinder, and then affect the size and shape of the particles. A higher rotation speed may result in smaller particles, while a lower rotation speed may produce larger particles. Therefore, the present invention needs to speed up the rotation speed of the rotary drum granulator 11 when the weight of large waste particles is high, and reduce the rotation speed of the rotary drum granulator 11 when the weight of small waste particles is high.

Claims

1. A device for improving and mixing silicon fertilizer produced from mine tailings, characterized in that: It includes a rotary drum granulator (11), a vibration screening mechanism and a return material conveying mechanism. The rotary drum granulator (11) structure comprises a rotary drum granulator (11) fixedly mounted on a frame, the two ends of the rotary drum granulator (11) are respectively an inlet (12) and an outlet (13), a water vapor input hole is arranged at one end of the rotary drum granulator (11) close to the outlet (13), and an aperture adjustment unit is arranged at the water vapor input hole (14); The vibrating screening mechanism is arranged at the discharge port (13), the vibrating screening mechanism is a double-layer vibrating screening machine (15), and the outlet end of the double-layer vibrating screening machine (15) is provided with a large particle outlet (16), a medium particle outlet (17) and a small particle outlet (18); The return material conveying mechanism comprises a return material conveying belt (19) connected to an external independent driving source and a conveying cage unit; the return material conveying belt (19) comprises a large particle conveying channel (20), a medium particle conveying channel (21) and a small particle conveying channel (22), and a collecting box (23) is arranged at the medium particle conveying channel (21); two groups of the conveying cage units are respectively arranged at one end of the large particle conveying channel (20) and the small particle conveying channel (22) close to the feed inlet (12), and the conveying cage unit is used to convey the residual material on the return material conveying belt to the feed inlet (12); a weight sensing component is arranged in the conveying auger unit, and the weight sensing component drives the aperture adjustment unit to adjust the aperture size of the water vapor input hole (14).

2. The improved mixing device for producing silicon fertilizer from mine tailings according to claim 1, characterized in that: The aperture adjustment unit comprises an annular pipe (31) rotatably mounted on the side wall of the rotary drum granulator (11), the inner wall of the annular pipe (31) being connected to the water vapor input hole, and the outer wall of the annular pipe (31) being connected to the gas transmission pipe (32); a first closing plate (33) and a second closing plate (34) are slidably mounted on the side wall of the annular pipe (31) along the axial direction of the annular pipe (31), the first closing plate (33) and the second closing plate (34) jointly closing the water vapor input hole; the first closing plate (33) and the second closing plate (34) are respectively connected to the weight sensing components in the two groups of the conveying auger units.

3. The improved mixing device for producing silicon fertilizer from mine tailings according to claim 2, characterized in that: The conveying auger unit comprises a body (41) fixedly mounted on a frame, the upper end of the body (41) is provided with a discharge channel (42) pointing to the feed port (12), the lower end of the body (41) is provided with a feed channel (43) pointing to the return conveyor belt (19), and a spiral shaft (44) with blades is sleeved in the body (41); the weight sensing component comprises a bottom plate (45) fixedly mounted on the lower end of the spiral shaft (44), a first spring (46) is provided between the bottom plate (45) and the body (41); the upper end of the spiral shaft (44) extends to the outside of the body (41), and the upper end of the spiral shaft (44) is hinged to the first closing plate (33) and the second closing plate (34) respectively through a hinge rod (47).

4. The improved mixing device for producing silicon fertilizer from mine tailings according to claim 3 is characterized by: The return material conveyor belt (19) comprises a conveying roller (51) connected to an external independent driving source, wherein the conveying roller (51) is fixedly mounted on a driving shaft (52), and the driving shaft (52) is connected to the screw shaft (44) through a speed regulating unit, wherein the speed regulating unit adjusts the rotation speed of the screw shaft (44) according to the weight of the weight sensing component.

5. The improved mixing device for producing silicon fertilizer from mine tailings according to claim 4 is characterized in that: The speed regulating unit comprises a rotating shaft (53) rotatably mounted on a frame, wherein the rotating shaft (53) and the screw shaft (44) are arranged perpendicularly; the rotating shaft (53) and the driving shaft (52) are synchronously driven and connected via a synchronous belt (54); a first friction wheel (55) is also key-connectedly mounted on the rotating shaft (53), wherein a second spring (56) is arranged between the first friction wheel (55) and the frame; and a second friction wheel (57) is fixedly mounted on the screw shaft (44), wherein the first friction wheel (55) and the second friction wheel (57) are frictionally driven and connected.

6. The improved mixing device for producing silicon fertilizer from mine tailings according to claim 5, characterized in that: The water vapor input holes are arranged at annular intervals on the side wall of the rotary drum granulator (11).

7. The improved mixing device for producing silicon fertilizer from mine tailings according to claim 2, characterized in that: The gas pipeline (32) transports water vapor at a temperature of (50) to (80) degrees Celsius.

8. The improved mixing device for producing silicon fertilizer from mine tailings according to claim 1, characterized in that: The rotary drum granulator (11) is driven by a first motor (61), and sensors are installed on both the first motor (61) and the weight sensing component. The first motor (61) controls the rotation speed according to the weight information transmitted by the weight sensing unit.

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