Coal slime slurry mixing multi-mixing modifier pretreater

Abstract

The present application relates to coal slime slurry technology field, propose a kind of coal slime slurry multi-mixing modification pretreater, including mixing barrel, with the inlet pipe of mixing barrel, and the stirring shaft being set in mixing barrel, key lies in: the pretreater further include the hedge net basket being set in mixing barrel, and the medicament dispersion disc being set in the top of hedge net basket, the outlet end of inlet pipe is communicated with the inside of hedge net basket, and the outlet of medicament dispersion disc is towards the inside of hedge net basket.Solved with the improvement of coal separation requirement in the related art, coal quality condition is poor, the poor effect of traditional slurry modification equipment's ore slurry pre-mineralization, mixing effect is not sufficient and the adaptability of low metamorphic degree coal is not strong, difficult to meet the use requirement problem.

Description

Technical Field

[0001] This invention relates to the field of coal slime conditioning technology, specifically to a coal slime conditioning and upgrading preprocessor. Background Technology

[0002] Coal slime pretreatment systems often encounter problems during the pre-mineralization of slurry, such as insufficient mineral mixing, poor mineralization effect, and low reagent dispersion during mixing. Furthermore, they fail to produce stable mineralization effects as coal quality changes. This not only increases reagent consumption but also fails to provide adequate pre-mineralization for subsequent flotation, resulting in substandard flotation concentrate and tailings, thus impacting product yield.

[0003] Existing technologies for slurry conditioning and upgrading mainly involve mixing and mineralizing reagents, air, and slurry through mechanical stirring, high-speed shearing, and free fall. However, with the increasing demands for coal sorting and the deterioration of coal quality, traditional slurry conditioning and upgrading equipment suffers from poor pre-mineralization, insufficient mixing, and limited adaptability to low-grade coals, making it difficult to meet usage requirements. Therefore, there is an urgent need to develop equipment that can condition and upgrade slurries for different coal qualities, achieving a new breakthrough in the field of slurry upgrading. Summary of the Invention

[0004] This invention proposes a coal slime slurry conditioning and upgrading preprocessor, which solves the problems in related technologies where, as coal sorting requirements increase and coal quality deteriorates, traditional slurry conditioning and upgrading equipment suffers from poor pre-mineralization of slurry, insufficient mixing effect, and poor adaptability to low-grade coal types, making it difficult to meet usage requirements.

[0005] The technical solution of the present invention is as follows: a coal slime slurry conditioning and upgrading preprocessor includes a mixing tank, an inlet pipe connected to the mixing tank, and a stirring shaft disposed in the mixing tank. The key feature is that the preprocessor also includes a counter-flushing mesh basket disposed in the mixing tank and a reagent dispersion disc disposed on the top of the counter-flushing mesh basket. The outlet end of the inlet pipe is connected to the inside of the counter-flushing mesh basket, and the outlet of the reagent dispersion disc faces the inside of the counter-flushing mesh basket.

[0006] The preprocessor also includes a stirring sleeve fitted around the stirring shaft and fixedly connected to the mixing tank. The flushing mesh basket and the agent dispersion disc are both fitted and fixed around the stirring sleeve. The preprocessor also includes a first flow guide baffle disposed below the flushing mesh basket. The outer end of the first flow guide baffle is inclined upward and connected to the mixing tank. A first flow guide hole is provided at the center of the first flow guide baffle. The preprocessor also includes a stirring assembly disposed below the first flow guide hole. The stirring assembly is connected to the stirring shaft.

[0007] The stirring assembly includes a turntable fixed around the stirring shaft and a flow guide stator disposed below the turntable. The outer end of the flow guide stator is inclined upward and connected to the first flow guide baffle. A flow guide channel is provided on the turntable, with the inlet end of the flow guide channel facing upward and the outlet end of the flow guide channel facing the flow guide stator. A liquid outlet channel is provided at the upper end of the flow guide stator.

[0008] The outlet end of the flow guiding channel is inclined downward.

[0009] An air inlet chamber is provided between the stirring sleeve and the stirring shaft. The inlet end of the guide channel is connected to the air inlet chamber. The pre-processor also includes an air inlet pipe. The inlet end of the air inlet pipe is located outside the mixing tank, and the outlet end of the air inlet pipe is connected to the air inlet chamber.

[0010] The preprocessor also includes a second flow guide baffle disposed below the stirring assembly. The outer end of the second flow guide baffle is inclined upward and connected to the mixing tank. A second flow guide hole is disposed at the center of the second flow guide baffle. The preprocessor also includes a shearing disk disposed below the second flow guide hole. The shearing disk is connected to the stirring shaft and the diameter of the shearing disk is larger than the diameter of the second flow guide hole.

[0011] A set of ribs is provided on the upper end face of the shearing disk. The length direction of the ribs is arranged along the radial direction of the shearing disk, and all the ribs are arranged along the circumference of the shearing disk. The height of the ribs gradually decreases from one end near the stirring shaft to the other end.

[0012] The preprocessor also includes a reagent tube, the inlet of which is located outside the mixing tank, and the outlet of which is connected to the inlet of the reagent dispersion disc.

[0013] A discharge port is provided on the side wall at the lower end of the mixing barrel. The pre-processor also includes a first cover body disposed around the discharge port and sealed to the mixing barrel. A second cover body is sealed to the upper end of the first cover body. The second cover body is connected to the first cover body. A discharge port is provided at the bottom of the second cover body.

[0014] The feed pipe includes a main feed pipe and at least two feed branch pipes. The lower end of the feed branch pipe is connected to the main feed pipe, and the upper end of the feed branch pipe is connected to the inside of the counter-flow basket.

[0015] The working principle and beneficial effects of this invention are as follows: A counter-flushing mesh basket is set inside the mixing tank, and a reagent dispersion disc is set on the top of the counter-flushing mesh basket. The outlet end of the feed pipe is connected to the inside of the counter-flushing mesh basket, and the outlet of the reagent dispersion disc faces the inside of the counter-flushing mesh basket. The reagent flowing out of the outlet of the reagent dispersion disc collides and mixes with the slurry sprayed from the feed pipe inside the counter-flushing mesh basket, and then flows out through the through holes on the counter-flushing mesh basket. This process can improve the dispersion effect of the reagent, thereby improving the pre-mineralization effect of the slurry, resulting in better mixing. It can improve the adaptability to coals with low metamorphic degree, improve coal quality, and achieve a new breakthrough in the field of slurry upgrading. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the stirring assembly in this invention.

[0019] Figure 3 This is a top view of the countersunk wire basket in this invention.

[0020] Figure 4 This is a top view of the shear disc in this invention.

[0021] Figure 5 This is a top view of the first flow guide baffle in this invention.

[0022] In the diagram: 1. Stirring sleeve, 2. Chemical tube, 3. Ribbed bar, 4. Shearing disc, 5. Turntable, 6. Guide stator, 7. Counter-flow mesh basket, 8. First guide baffle, 9. Mixing tank, 10. First guide hole, 11. Guide channel, 12. Feed branch pipe, 13. Feed main pipe, 14. Discharge port, 15. Second guide baffle, 16. Air inlet pipe, 17. Second guide hole, 18. Stirring shaft, 19. Chemical dispersion disc, 20. First cover, 21. Second cover, 22. Discharge port, 23. Drive mechanism, 24. Belt cover. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] Specific embodiments, such as Figure 1 As shown, a coal slime slurry conditioning and upgrading preprocessor includes a mixing tank 9, an inlet pipe connected to the mixing tank 9, and a stirring shaft 18 disposed inside the mixing tank 9. It also includes a counter-flushing mesh basket 7 disposed inside the mixing tank 9 and a reagent dispersion plate 19 disposed on the top of the counter-flushing mesh basket 7. The outlet end of the inlet pipe is connected to the inside of the counter-flushing mesh basket 7, and the outlet of the reagent dispersion plate 19 faces the inside of the counter-flushing mesh basket 7.

[0025] As a further improvement to the present invention, the preprocessor also includes a stirring sleeve 1 fitted around the stirring shaft 18 and fixedly connected to the mixing tank 9. The flushing mesh basket 7 and the reagent dispersion disc 19 are both fitted and fixedly installed around the stirring sleeve 1. The preprocessor also includes a first flow guide baffle 8 disposed below the flushing mesh basket 7. The outer end of the first flow guide baffle 8 is inclined upwards and connected to the mixing tank 9. A first flow guide hole 10 is provided at the center of the first flow guide baffle 8. The preprocessor also includes a stirring assembly disposed below the first flow guide hole 10, and the stirring assembly is connected to the stirring shaft 18. Figure 1 and Figure 5 As shown, the driving mechanism 23 drives the stirring shaft 18 to rotate. The reagent flowing out of the outlet of the reagent dispersion plate 19 and the slurry sprayed from the feed pipe collide and mix in the counter-flushing mesh basket 7. Then, it flows out through the through hole on the counter-flushing mesh basket 7. Under the guidance of the first guide baffle 8, it passes through the first guide hole 10 and reaches the stirring component. The stirring component stirs and mixes the slurry again, which can further improve the mixing effect.

[0026] As a further improvement to the present invention, the stirring assembly includes a turntable 5 fixed around the stirring shaft 18, and a flow guide stator 6 disposed below the turntable 5. The outer end of the flow guide stator 6 is inclined upward and connected to a first flow guide baffle 8. A flow guide channel 11 is provided on the turntable 5, with the inlet end of the flow guide channel 11 facing upward and the outlet end of the flow guide channel 11 facing the flow guide stator 6. A liquid outlet channel is provided at the upper end of the flow guide stator 6. Figure 1 and Figure 2 As shown, after the slurry flows out through the holes on the counter-flow mesh basket 7, it enters the flow guide stator 6 under the guidance of the first flow guide baffle 8. The stirring shaft 18 drives the turntable 5 to rotate, performing negative pressure suction stirring and dispersion. The stirred slurry collides with the flow guide stator 6 to disperse the fluid around its perimeter, and then flows out through the liquid outlet channel at the upper end of the flow guide stator 6, which can further improve the mixing effect. The number of flow guide channels 11 is at least two, and all flow guide channels 11 are arranged along the circumference of the turntable 5.

[0027] As a further improvement to the present invention, such as Figure 1 and Figure 2 As shown, the outlet end of the guide channel 11 is inclined downwards, so that the slurry can flow out smoothly from the turntable 5 and avoid the slurry from accumulating in the guide channel 11.

[0028] As a further improvement to the present invention, an air inlet chamber is provided between the stirring sleeve 1 and the stirring shaft 18, the inlet end of the guide channel 11 is connected to the air inlet chamber, and the pre-processor also includes an air inlet pipe 16, the inlet end of the air inlet pipe 16 being located outside the mixing tank 9, and the outlet end of the air inlet pipe 16 being connected to the air inlet chamber. Figure 1As shown, during the negative pressure suction mixing and dispersion process of the mixing component, air can be drawn in through the air inlet chamber and air inlet pipe 16 between the mixing sleeve 1 and the mixing shaft 18 to ensure that the slurry flows out smoothly. The air inlet pipe 16 adopts a self-suction method for feeding in, and the air supply volume should not be too large. It can be adjusted according to the actual production.

[0029] As a further improvement to the present invention, the preprocessor also includes a second flow guide baffle 15 disposed below the stirring assembly. The outer end of the second flow guide baffle 15 is inclined upward and connected to the mixing tank 9. A second flow guide hole 17 is disposed at the center of the second flow guide baffle 15. The preprocessor also includes a shearing disk 4 disposed below the second flow guide hole 17. The shearing disk 4 is connected to the stirring shaft 18, and the diameter of the shearing disk 4 is larger than the diameter of the second flow guide hole 17. Figure 1 As shown, the slurry, after being stirred and dispersed by the stirring assembly, falls onto the shearing disk 4 through the second guide hole 17 under the guidance of the second guide baffle 15. The stirring shaft 18 drives the shearing disk 4 to rotate and shear and disperse the slurry, which can further improve the mixing effect.

[0030] As a further improvement to the present invention, a set of ribs 3 are provided on the upper end face of the shearing disk 4. The length direction of the ribs 3 is arranged along the radial direction of the shearing disk 4, and all the ribs 3 are arranged along the circumference of the shearing disk 4. The height of the ribs 3 gradually decreases from one end near the stirring shaft 18 to the other end. Figure 1 and Figure 4 As shown, eight ribs 3 are evenly arranged along the circumference of the shearing disk 4. The ribs 3 and the shearing disk 4 rotate synchronously. The two work together to shear and disperse the slurry, dispersing the slurry into the area below the second guide baffle 15, which can prevent the slurry from flowing back and being blocked.

[0031] As a further improvement to the present invention, the preprocessor also includes a reagent tube 2, the inlet end of which is located outside the mixing tank 9, and the outlet end of which is connected to the inlet of the reagent dispersion disc 19. Figure 1 As shown, the agent can be added to the agent dispersion tray 19 through the agent tube 2, which is more convenient and labor-saving. The agent tube 2, when paired with an automatic dosing pump, can control the agent flow rate and velocity.

[0032] As a further improvement to the present invention, a discharge port 14 is provided on the side wall at the lower end of the mixing tank 9. The preprocessor also includes a first cover 20 disposed around the discharge port and sealed to the mixing tank 9. A second cover 21 is sealed to the upper end of the first cover 20, and the second cover 21 communicates with the first cover 20. A discharge port 22 is provided at the bottom of the second cover 21. Figure 1As shown, the mixed slurry flows out of the mixing tank 9 through the discharge port 14, enters the first enclosure 20, and then is discharged through the discharge port 22 of the second enclosure 21 into the flotation machine. The first enclosure 20 and the second enclosure 21 work together to make the slurry flow from top to bottom, which can further improve the mixing effect.

[0033] As a further improvement to the present invention, the feed pipe includes a main feed pipe 13 and at least two feed branch pipes 12, the lower end of the feed branch pipe 12 being connected to the main feed pipe 13, and the upper end of the feed branch pipe 12 being connected to the interior of the counter-flush basket 7. Figure 1 As shown, the slurry is sprayed out through multiple feed distribution pipes 12, colliding and mixing with the reagent flowing out of the reagent dispersion plate 19 from multiple directions. Furthermore, the slurry between the feed distribution pipes 12 also undergoes counter-collision, further enhancing the mixing effect. The portion of the feed distribution pipe 12 located inside the mixing tank 9 uses a variable diameter design to increase the flow velocity and achieve a counter-collision mixing effect.

[0034] In practical use, the mixing tank 9 has a main feed pipe 13 at the bottom, and the lower ends of 3-4 feed branch pipes 12 are all connected to the main feed pipe 13. The upper ends of the feed branch pipes 12 are all connected to the inside of the anti-flush mesh basket 7. The anti-flush mesh basket 7 is fixed on the stirring sleeve 1 and is a hollow cylindrical structure with uniformly sized round holes on its surface to disperse the feed slurry and prevent stagnation. The drive mechanism 23, the first cover 20, and the second cover 21 are all located to the right of the stirring shaft 18. The mixing tank 9 includes a tank body and a tank cover. The drive mechanism 23 is located above the tank cover, and the stirring sleeve 1 is fixed on the tank cover. The drive mechanism 23 is preferably a variable frequency motor. The output shaft of the variable frequency motor and the upper end of the stirring shaft 18 are both fixed with pulleys. The two pulleys are connected by a belt. The pulleys and belt are both located inside the belt cover 24 for better safety. The speed of the stirring shaft 18 can be adjusted using the variable frequency motor. The upper end of the tank body is cylindrical and the lower end is conical. The tank is divided into three zones from top to bottom: the area above the first guide baffle 8 is the anti-flush zone, the area between the first guide baffle 8 and the second guide baffle 15 is the mixing zone, and the area below the second guide baffle 15 is the shearing zone. The lower end of the guide stator 6 is fixedly connected to the mixing sleeve 1 located below it. The interior of the tank can be reinforced with supporting angle steel. A flow meter and automatic valve are installed on the feed main pipe 13 to control the flow rate and volume of the feed slurry, and it is connected to an online control system. The reagent dispersion disc 19 uses a jet mist nozzle to control the dosing process of the flotation reagent, achieving a mixing effect within the anti-flush basket 7.

[0035] This invention utilizes a drive mechanism 23 to rotate a stirring shaft 18. The slurry in the main feed pipe 13 is sprayed into the counter-flushing basket 7 through the feed branch pipe 12. The reagent flowing out from the outlet of the reagent dispersion disc 19 collides and mixes with the slurry sprayed from the feed branch pipe 12 within the counter-flushing basket 7. Then, it flows out through the through-holes in the counter-flushing basket 7 and enters the counter-flushing zone above the first guide baffle 8. Under the guiding action of the first guide baffle 8, it enters the guide stator 6. A certain gap exists between the turntable 5 and the guide stator 6. The stirring shaft 18 drives the turntable 5 to rotate, enabling the slurry to flow downwards and forming a certain amount of negative pressure. Air is drawn in through the air inlet pipe 16, where the slurry achieves three-phase system docking. The stirred slurry collides with the guide stator 6 to disperse the fluid around and discharge it into the stirring zone between the first guide baffle 8 and the second guide baffle 15. Then, under the guiding action of the second guide baffle 15, it falls onto the shearing disk 4 through the second guide hole 17. The stirring shaft 18 drives the shearing disk 4 to rotate and shear and disperse the slurry. The slurry falls into the shearing zone below the second guide baffle 15 and then flows out through the discharge port 14 into the first hood 20. Finally, it is discharged through the discharge port 22 of the second hood 21 into the flotation machine.

[0036] The slurry and reagents of this invention are sequentially mixed by counter-flushing within the counter-flushing basket 7, stirred under negative pressure between the turntable 5 and the guide stator 6, and sheared by the high-speed shearing of the shearing disk 4. This improves the dispersion effect of the reagents, thereby enhancing the pre-mineralization effect of the slurry and resulting in better mixing. It also improves the adaptability to coals with low metamorphic properties, improves coal quality, and saves on reagent usage, achieving a new breakthrough in the field of slurry upgrading. It can be applied to the pre-mineralization stage of fine-grained slurries before flotation in industries such as coal, metallurgy, and powder processing.

Claims

1. A coal slime slurry conditioning and upgrading preprocessor, comprising a mixing tank (9), an inlet pipe connected to the mixing tank (9), and a stirring shaft (18) disposed within the mixing tank (9), characterized in that: The preprocessor also includes a counter-flush basket (7) set in the mixing tank (9) and a drug dispersion plate (19) set on the top of the counter-flush basket (7). The outlet end of the feed pipe is connected to the inside of the counter-flush basket (7), and the outlet of the drug dispersion plate (19) faces the inside of the counter-flush basket (7). The preprocessor also includes a stirring sleeve (1) fitted around the stirring shaft (18) and fixedly connected to the mixing tank (9). The flushing mesh basket (7) and the agent dispersion disk (19) are both fitted and fixed around the stirring sleeve (1). The preprocessor also includes a first flow guide plate (8) set below the flushing mesh basket (7). The outer end of the first flow guide plate (8) is inclined upward and connected to the mixing tank (9). A first flow guide hole (10) is provided at the center of the first flow guide plate (8). The preprocessor also includes a stirring assembly set below the first flow guide hole (10). The stirring assembly is connected to the stirring shaft (18). The stirring assembly includes a turntable (5) fixed around the stirring shaft (18) and a flow guide stator (6) set below the turntable (5). The outer end of the flow guide stator (6) is inclined upward and connected to the first flow guide baffle (8). A flow guide channel (11) is provided on the turntable (5). The inlet end of the flow guide channel (11) faces upward and the outlet end of the flow guide channel (11) faces the flow guide stator (6). A liquid outlet channel is provided at the upper end of the flow guide stator (6). An air inlet chamber is provided between the stirring sleeve (1) and the stirring shaft (18). The inlet end of the guide channel (11) is connected to the air inlet chamber. The preprocessor also includes an air inlet pipe (16). The inlet end of the air inlet pipe (16) is located outside the mixing tank (9), and the outlet end of the air inlet pipe (16) is connected to the air inlet chamber. The preprocessor also includes a second flow guide plate (15) disposed below the stirring assembly. The outer end of the second flow guide plate (15) is inclined upward and connected to the mixing tank (9). A second flow guide hole (17) is provided at the center of the second flow guide plate (15). The preprocessor also includes a shearing disk (4) disposed below the second flow guide hole (17). The shearing disk (4) is connected to the stirring shaft (18). The diameter of the shearing disk (4) is larger than the diameter of the second flow guide hole (17).

2. The coal slime slurry conditioning and upgrading pre-processor according to claim 1, characterized in that: The outlet end of the flow channel (11) is inclined downward.

3. The coal slime slurry conditioning and upgrading pre-processor according to claim 1, characterized in that: A set of ribs (3) is provided on the upper end face of the shearing disk (4). The length direction of the ribs (3) is arranged along the radial direction of the shearing disk (4). All the ribs (3) are arranged along the circumference of the shearing disk (4). The height of the ribs (3) gradually decreases from one end near the stirring shaft (18) to the other end.

4. The coal slime slurry conditioning and upgrading pre-processor according to claim 1, characterized in that: The preprocessor also includes a drug tube (2), the inlet of which is located outside the mixing tank (9), and the outlet of which is connected to the inlet of the drug dispersion disc (19).

5. The coal slime slurry conditioning and upgrading pre-processor according to claim 1, characterized in that: A discharge port (14) is provided on the side wall at the lower end of the mixing barrel (9). The preprocessor also includes a first cover (20) which is located around the discharge port (14) and is sealed to the mixing barrel (9). A second cover (21) is sealed to the upper end of the first cover (20). The second cover (21) is connected to the first cover (20). A discharge port (22) is provided at the bottom of the second cover (21).

6. The coal slime slurry conditioning and upgrading pre-processor according to claim 1, characterized in that: The feed pipe includes a main feed pipe (13) and at least two feed branch pipes (12). The lower end of the feed branch pipe (12) is connected to the main feed pipe (13), and the upper end of the feed branch pipe (12) is connected to the inside of the counter-flush basket (7).

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