A coarse coal slime separation and combined dehydration equipment and medium coal dissociation and reselection process

Abstract

The present invention discloses a coarse coal slime separation and dehydration device and a medium coal separation and reselection process, relating to the field of coal processing and mineral processing technology. The present invention combines a coarse coal slime separator with a scraper vibrating centrifugal dehydrator to form an innovative integrated device. This device aims to address the problems of low coarse coal slime separation accuracy, low dehydration efficiency, and complex process flow in the prior art. At the same time, the present invention improves the processing of medium coal, utilizing a multi-step crushing, screening, conditioning, and flotation process to significantly enhance the separation of clean coal from gangue, increase the recovery rate of clean coal, and reduce the carbon content in tail coal. This improved process flow allows for efficient recovery of medium coal and clean coal, improving the purity of the clean coal and overall resource utilization efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of coal processing and ore dressing, and in particular to a coarse coal slime separation and combined dehydration device and a medium coal dissociation and re-selection process. Background Art

[0002] Coal is one of the world's most important energy resources. Especially in the context of an incomplete energy transition, coal still plays a crucial role in industrial production and energy supply. However, in the coal washing and processing process, the handling of coarse coal slime and medium coal remains a challenging step. How to efficiently process these materials to maximize coal utilization is a pressing issue in the industry.

[0003] During coal mining and processing, heavy medium middling coal (DMM) is a byproduct containing a certain amount of clean coal and gangue. Middling coal, a complex substance between clean coal and gangue, is challenging to process and separate, especially in terms of minimizing ash content while ensuring clean coal recovery. Traditional middling coal processing primarily involves heavy medium separation and flotation, but these processes have numerous shortcomings. Existing middling coal processing techniques suffer from significant issues such as inadequate separation of clean coal from gangue, low recovery rates, and resource waste.

[0004] Aiming at these problems, the present invention proposes a novel coarse coal slime separation and combined dehydration equipment and a medium coal dissociation and reselection process. Summary of the Invention

[0005] The purpose of the present invention is to provide a coarse coal slime separation and combined dehydration equipment and a medium coal dissociation and reselection process to solve the above problems.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides a coarse coal slime separation and dehydration device, comprising a coarse coal slime separation mechanism and a vertical vibrating centrifugal mechanism connected in an upper and lower manner;

[0008] The coarse coal slime sorting mechanism includes a sorting drum connected to the top of the vertical vibrating centrifugal mechanism, an actuator is provided on the top of the sorting drum, the actuator is electrically connected to the PID controller, a feeding port is provided on one side of the top of the actuator, the bottom of the actuator is connected to a feeding well deep into the sorting drum, the bottom of the feeding well is connected to several feeding pipes, a density sensor is provided on one side of the feeding well, the density sensor is electrically connected to the PID controller, the bottom of the sorting drum is connected to a discharge pipe, an underflow discharge valve is installed on the discharge pipe, the underflow discharge valve is electrically connected to the PID controller, the bottom of the discharge pipe is connected to the vertical vibrating centrifugal mechanism, a disturbance plate is provided on the outside of the discharge pipe, a water inlet pipe is connected to the bottom outer wall of the sorting drum, an overflow trough is connected to the top outer wall of the rising sorting drum, and an overflow hole is opened at the bottom of one end of the rising overflow trough;

[0009] The vertical vibrating centrifuge mechanism includes a chassis connected to the sorting drum, a centrifugal shell is provided inside the chassis, the top of the centrifugal shell is connected to a feeding hopper, the bottom of the discharge pipe passes through the chassis and is placed above the feeding hopper, a rotating assembly is provided below the feeding hopper, the bottom of the rotating assembly is connected to a vibrating assembly, a screen is connected to the rotating assembly, the outside of the screen is connected to a receiving bucket, the bottom of the receiving bucket is connected to a drain pipe, the other end of the drain pipe passes through the centrifugal shell and the chassis and is connected to the filtering mechanism, and a blanking gap is provided between the receiving bucket and the centrifugal shell.

[0010] Furthermore, the feed well is cylindrical, and the feeding pipes are evenly distributed on the bottom of the feed well in a radial shape, forming a spoke shape.

[0011] Furthermore, a feeding pipe is connected to the bottom of the feed well, and the feeding pipe is preferably a feeding pipe, which is evenly connected to the bottom of the feed well in a straight line.

[0012] Furthermore, the rotating assembly includes a rotor and a motor for controlling the rotation of the rotor, the motor is connected to the vibration assembly, a bell-shaped cover is provided on the outside of the rotor, the bottom of the bell-shaped cover is connected to the rotor, and the bottom of the screen is connected to the rotor.

[0013] Furthermore, the vibration assembly includes a vibrator connected to the motor, the motor is installed on the bottom of the chassis, and the vibrator is connected to the bottom of the screen.

[0014] A medium coal separation and re-selection process using a coarse coal slime separation and dehydration device is characterized by comprising the following steps:

[0015] S1. The raw material heavy medium coal is sent to the grading screen for screening, the large-particle coal sample is sent to the hammer crusher for crushing, and after crushing, it is mixed with the small-particle coal sample and then classified by the grading cyclone;

[0016] S2. The large-size coal sample separated by the cyclone is sent to the coarse coal slime separation and dehydration equipment to separate the clean coal product and the dehydrated gangue product, and the small-size part is tempered;

[0017] S3. The quenched and tempered material is fed into a flotation device for a roughing process to obtain roughed clean coal and tailings;

[0018] S4. The coarsely selected clean coal is sent to the selected mixing tank for slurry preparation and then enters the flotation device to obtain flotation clean coal. The tail coal from the two flotation processes enters the concentrator and the quick-opening filter press to obtain the dry flotation tail coal product.

[0019] Furthermore, the graded screening particle size is 1 mm, and the large-particle coal sample is crushed and then mixed with the small-particle coal sample.

[0020] Furthermore, the classification cyclone has a separation particle size of 0.5 mm.

[0021] Furthermore, the tempering treatment is: after entering the stirred mill treatment, entering the stirring barrel for slurry adjustment to improve the flotation effect.

[0022] Furthermore, the flotation equipment is a flotation column.

[0023] Compared with the prior art, the present invention has the following beneficial technical effects:

[0024] The present invention combines a coarse coal slime separator with a scraper vibrating centrifugal dehydrator to form an innovative integrated device, aiming to solve the problems of low coarse coal slime separation accuracy, low dehydration efficiency and complex process flow in the prior art.

[0025] This invention improves the processing of middling coal by employing a multi-step process combining crushing, screening, conditioning, and flotation. This significantly enhances the separation of clean coal from gangue, increases the recovery rate of clean coal, and reduces the carbon content in tailings. This improved process enables the efficient recovery of middling coal and clean coal, improving the purity of the clean coal and overall resource utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Figure 1 This is a coarse coal slime separation and combined dehydration device and a cross-sectional view of the present invention;

[0028] Figure 2 This is a top view of the feed pipe installation;

[0029] Figure 3 This is a flow chart of the medium coal dissociation and reselection process;

[0030] Figure 4 This is the equipment connection diagram of the medium coal dissociation and reselection process;

[0031] Explanation of the accompanying symbols: 1. Sorting drum; 2. Actuator; 3. Feed port; 4. Feed well; 5. Feed pipe; 6. Discharge pipe; 7. Underflow discharge valve; 8. PID controller; 9. Density sensor; 10. Disturbance plate; 11. Water inlet pipe; 12. Overflow trough; 13. Overflow hole; 14. Chassis; 15. Centrifuge casing; 16. Feed hopper; 17. Screen; 18. Receiving barrel; 19. Discharge pipe; 20. Rotor; 21. Motor; 22. Bell cover; 23. Vibrator. DETAILED DESCRIPTION

[0032] like Figure 1-2 As shown, a coarse coal slime separation and dehydration device includes a coarse coal slime separation mechanism and a vertical vibrating centrifugal mechanism connected upper and lower.

[0033] The coarse coal slime sorting mechanism includes a sorting drum 1 connected above the vertical vibrating centrifugal mechanism, an actuator 2 is provided on the top of the sorting drum 1, and the actuator 2 is electrically connected to the PID controller 8. A feeding port 3 is provided on one side of the top of the actuator 2, and the bottom of the actuator 2 is connected to a feeding well 4 deep into the sorting drum 1. A density sensor 9 is provided on one side of the feeding well 4, and the density sensor 9 is electrically connected to the PID controller 8. The feeding rate is controlled by the actuator 2, and the actuator 2 can be controlled by the PID controller 8. The actuator 2 obtains data through the density sensor 9 for regulation.

[0034] The bottom of the feed well 4 is connected to several feeding pipes 5, and the feed well 4 is cylindrical. The feeding pipes 5 are evenly distributed on the bottom of the feed well 4 in a radial shape, forming a spoke shape. The bottom of the feed well 4 is connected to 6-8 feeding pipes 5, and the feeding pipes 5 are preferably 8. The feeding pipes 5 are evenly connected to the bottom of the feed well 4 in a straight line.

[0035] The bottom of the sorting drum 1 is connected to a discharge pipe 6, and an underflow discharge valve 7 is installed on the discharge pipe 6. The underflow discharge valve 7 is electrically connected to the PID controller 8. The bottom of the discharge pipe 6 is connected to the vertical vibrating centrifugal mechanism. A disturbance plate 10 is provided on the outside of the discharge pipe 6. A water inlet pipe 11 is connected to the bottom outer wall of the sorting drum 1, and an overflow trough 12 is connected to the top outer wall of the rising sorting drum 1. An overflow hole 13 is provided at the bottom of one end of the rising overflow trough 12.

[0036] The vertical vibrating centrifuge mechanism includes a chassis 14 connected to the sorting drum 1, a centrifugal shell 15 is provided inside the chassis 14, the top of the centrifugal shell 15 is connected to a feeding hopper 16, the bottom of the discharge pipe 6 passes through the chassis 14 and is placed above the feeding hopper 16, a rotating assembly is provided below the feeding hopper 16, the bottom of the rotating assembly is connected to a vibrating assembly, a screen 17 is connected to the rotating assembly, the outside of the screen 17 is connected to a receiving barrel 18, the bottom of the receiving barrel 18 is connected to a drain pipe 19, the other end of the drain pipe 19 passes through the centrifugal shell 15 and the chassis 14 and is connected to the filtering mechanism, and a blanking gap is provided between the receiving barrel 18 and the centrifugal shell 15.

[0037] The rotating assembly includes a rotor 20 and a motor 21 for controlling the rotation of the rotor 20. The motor 21 is connected to the vibration assembly. A bell-shaped cover 22 is provided on the outside of the rotor 20. The bottom of the bell-shaped cover 22 is connected to the rotor 20. The bell-shaped cover 22 prevents the material from falling vertically too fast and causing damage to the surface of the rotor 20. The bottom of the screen 17 is connected to the rotor 20.

[0038] The vibration assembly includes a vibrator 23 connected to the motor 21 ， The motor 21 is mounted on the bottom of the housing 14, and the vibrator 23 is connected to the bottom of the screen 17. A buffer spring is provided at the bottom of the screen 17.

[0039] like Figure 3 As shown, a medium coal separation and re-selection process using a coarse coal slime separation and dehydration device is characterized by comprising the following steps:

[0040] S1. The raw material heavy medium coal is sent to the grading screen for screening, the large-particle coal sample is sent to the hammer crusher for crushing, and after crushing, it is mixed with the small-particle coal sample and then classified by the grading cyclone;

[0041] S2. The large-size coal sample separated by the grading cyclone is fed to a coarse coal slime separation and dewatering device. The grading screening particle size is 1mm, or 0.5mm. The large-size coal sample is crushed and mixed with the small-size coal sample to separate the clean coal product and the dehydrated gangue product. The small-size fraction is subjected to a tempering treatment. The tempering treatment includes: entering a stirred mill for treatment and then entering a mixing tank for slurry preparation to improve the flotation effect.

[0042] S3. The quenched and tempered material is fed into a flotation device, wherein the flotation device is a flotation column, and a roughing process is performed to obtain roughed clean coal and tailings;

[0043] S4. The coarsely selected clean coal is sent to the selected mixing tank for slurry preparation and then enters the flotation device to obtain flotation clean coal. The tail coal from the two flotation processes enters the concentrator and the quick-opening filter press to obtain the dry flotation tail coal product.

[0044] like Figure 4 As shown, the raw material heavy medium coal is first conveyed to the grading screen A by belt conveyor for classification. The oversize material is processed by the hammer crusher B and then conveyed to the grading cyclone C together with the undersize material by belt conveyor. The overflow of the cyclone is sent to the coarse coal slime sorting system D. After sorting, clean coal products and gangue products are produced. The undersize material is sent to the stirred mill E for grinding. The ground material enters the roughing mixing barrel F for slurry mixing. The slurry-mixed material is sorted by the roughing flotation column G to obtain clean coal and tail coal. The clean coal further enters the fine mixing barrel H for re-slurrying and is then pumped into the fine flotation column I to separate the medium coal and clean coal. The clean coal is dehydrated by the quick-opening filter press K to become the flotation clean coal product. The medium coal is sent to the stirred mill J and then enters the roughing mixing barrel F to form a cycle. The tail coal sorted by the roughing flotation column G is concentrated by the thickener L and pumped into the quick-opening filter press M to produce the flotation tail coal product after dehydration.

[0045] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A coarse coal slime separation and dehydration device, characterized by: It includes a coarse coal slime separation mechanism and a vertical vibrating centrifugal mechanism connected upper and lower; The coarse coal slime separation mechanism comprises a separation drum (1) connected above the vertical vibrating centrifugal mechanism, an actuator (2) is provided on the top of the separation drum (1), the actuator (2) is electrically connected to a PID controller (8), a feed port (3) is provided on one side of the top of the actuator (2), a feed well (4) deep into the separation drum (1) is connected to the bottom of the actuator (2), a plurality of feed pipes (5) are connected to the bottom of the feed well (4), a density sensor (9) is provided on one side of the feed well (4), and the density sensor (9) is connected to the P The PID controller (8) is electrically connected to the bottom of the separation drum (1); a discharge pipe (6) is connected to the bottom of the discharge pipe (6); an underflow discharge valve (7) is installed on the discharge pipe (6); the underflow discharge valve (7) is electrically connected to the PID controller (8); the bottom of the discharge pipe (6) is connected to the vertical vibrating centrifugal mechanism; a disturbance plate (10) is provided on the outside of the discharge pipe (6); a water inlet pipe (11) is connected to the bottom outer wall of the separation drum (1); an overflow trough (12) is connected to the top outer wall of the ascending separation drum (1); an overflow hole (13) is provided at the bottom of one end of the ascending overflow trough (12); The vertical vibrating centrifugal mechanism comprises a chassis (14) connected to the sorting drum (1), a centrifugal shell (15) is provided inside the chassis (14), a feeding hopper (16) is connected to the top of the centrifugal shell (15), the bottom of the discharge pipe (6) passes through the chassis (14) and is placed above the feeding hopper (16), a rotating assembly is provided below the feeding hopper (16), the bottom of the rotating assembly is connected to a vibrating assembly, a screen (17) is connected to the rotating assembly, the outer side of the screen (17) is connected to a receiving barrel (18), the bottom of the receiving barrel (18) is connected to a drain pipe (19), the other end of the drain pipe (19) passes through the centrifugal shell (15) and the chassis (14) and is connected to the filtering mechanism, and a blanking gap is provided between the receiving barrel (18) and the centrifugal shell (15).

2. The coarse coal slime separation and dehydration equipment according to claim 1, characterized in that: The feed well (4) is cylindrical, and the feed pipes (5) are evenly distributed on the bottom of the feed well (4) in a radial shape, forming a spoke shape.

3. The coarse coal slime separation and dehydration equipment according to claim 2, characterized in that: The bottom of the feed well (4) is connected with 6-8 feeding pipes (5), preferably 8 feeding pipes (5), and the feeding pipes (5) are evenly connected to the bottom of the feed well (4) in a straight line.

4. The coarse coal slime separation and dehydration equipment according to claim 1, characterized in that: The rotating assembly comprises a rotor (20) and a motor (21) for controlling the rotation of the rotor (20); the motor (21) is connected to the vibration assembly; a bell-shaped cover (22) is provided on the outer side of the rotor (20); the bottom of the bell-shaped cover (22) is connected to the rotor (20); and the bottom of the screen (17) is connected to the rotor (20).

5. The coarse coal slime separation and dehydration equipment according to claim 4, characterized in that: The vibration assembly includes a vibrator (23) connected to the motor (21) ， The motor (21) is mounted on the bottom of the chassis (14), and the vibrator (23) is connected to the bottom of the screen (17).

6. A medium coal separation and re-selection process using the coarse coal slime separation and dehydration equipment according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. The raw material heavy medium coal is sent to the grading screen for screening, the large-particle coal sample is sent to the hammer crusher for crushing, and after crushing, it is mixed with the small-particle coal sample and then classified by the grading cyclone; S2. The large-size coal sample separated by the classifying cyclone is sent to the coarse coal slime separation and dehydration equipment to separate the clean coal product and the dehydrated gangue product, and the small-size part is tempered; S3. The quenched and tempered material is fed into a flotation device for a roughing process to obtain roughed clean coal and tailings; S4. The coarsely selected clean coal is sent to the selection mixing tank for slurry preparation, and then enters the flotation device to obtain flotation clean coal. The tail coal from the two flotation processes enters the concentrator and the quick-opening filter press to obtain the dry flotation tail coal product.

7. The medium coal dissociation and reselection process according to claim 6, characterized in that: The grading screening particle size is 1 mm, and the large-particle coal sample is crushed and then mixed with the small-particle coal sample.

8. The medium coal dissociation and reselection process according to claim 6, characterized in that: The classification cyclone has a separation particle size of 0.5 mm.

9. The medium coal dissociation and reselection process according to claim 6, characterized in that: The tempering treatment is as follows: after entering the stirred mill for treatment, the slurry is then sent to the stirring barrel for slurry adjustment to improve the flotation effect.

10. The medium coal dissociation and reselection process according to claim 6, characterized in that: The flotation equipment is a flotation column.

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