CN218132498U - Deep upgrading system for fine coal slime - Google Patents

Abstract

A fine coal slime deep upgrading system belongs to the technical field of coal slime deep dehydration. In the prior art, the flotation process is adopted for recycling, so that the early construction investment is large, the occupied space is large, and the investment cost for later maintenance and medicament use is high. Based on the background, the main problem to be solved at present is to find a new process or equipment to replace the flotation process. The utility model comprises a dehydration system and a concentration system, wherein the dehydration system comprises a clean coal swirler, a coarse slime separator and a sedimentation centrifuge; a coarse grain outlet of the clean coal swirler is connected with a coarse coal slime separator; the fine grain outlet of the clean coal cyclone is connected with a sedimentation centrifuge; the fine grain outlet of the sedimentation centrifuge is connected with a concentration system. And a sedimentation centrifuge is introduced, and a fine particle outlet of the clean coal cyclone is connected into the system, so that the construction investment is smaller, the occupied area is small, only one piece of equipment of the sedimentation centrifuge needs to be maintained in the later period, and the operation cost is low compared with the introduction of a flotation process.

Description

Deep upgrading system for fine coal slime

Technical Field

A fine coal slime deep upgrading system belongs to the technical field of coal slime deep dehydration.

Background

Coking coal belongs to a scarce coal variety in China and is an indispensable nonrenewable resource for forming coke and reducing ores. With the improvement of the coal mining mechanization degree and the change of the mining depth, the coal quality condition and the fine fraction content of the coking coal are continuously changed, so that a new system for recovering and dehydrating the coal slime of the coal type, particularly recovering the fine coal slime is urgently needed for improving the utilization rate of the coking coal so as to improve the recovery rate of the clean coal.

In the fine coal slime separation process of the coal preparation plant for coking coal in China, the feeding of the fine coal slime separation equipment is mainly overflow of fuzzy classification equipment, namely a swirler, the swirler is mainly used for concentration classification in the process and is limited by the structure of the swirler, and the selected coal slime cannot be efficiently classified, so that most fine particle (less than 0.2 mm) materials directly enter a concentration and pressure filtration system to be sold as coal slime products or are recovered by a flotation process. The coal slime product cannot improve the economic benefit when being sold.

In the prior art, a flotation process is adopted for recycling, and two parts of slime water, namely clean slime grading cyclone overflow, stack sieve screen underflow and gangue grading cyclone overflow, are mixed and enter a flotation link together. The coal slime water and the medicament are uniformly mixed by the ore pulp preprocessor and then enter a flotation column for flotation, the flotation clean coal is dehydrated by an air flow-through water squeezing filter press, and the main cleaning clean coal is uniformly mixed by a disc feeder. A mixer is added on the head of the belt conveyor for feeding the clean coal to the bin, so that the clean coal and the flotation clean coal are uniformly mixed. And (5) feeding the flotation tail coal into a thickener. And concentrating, performing filter pressing on the underflow, and recycling filtrate of the clean coal and tail coal filter press and overflow of the concentrator. The process has large construction investment in the early stage, large occupied space and high investment cost for later maintenance and medicament use. Based on the background, the main problem to be solved at present is to find a new process or equipment to replace the flotation process.

Disclosure of Invention

The utility model discloses the technical problem that will solve is: the system can further separate fine particles in the coal slime, particularly fine particles below 0.2mm, and is low in construction investment, small in occupied area and simple in later maintenance.

The utility model provides a technical scheme that its technical problem adopted is: a system for deeply upgrading fine coal slime is characterized in that: the system comprises a dehydration system and a concentration system, wherein the dehydration system comprises a clean coal swirler, a coarse slime separator and a sedimentation centrifuge; a coarse grain outlet of the clean coal swirler is connected with a coarse coal slime separator; the fine grain outlet of the clean coal cyclone is connected with a sedimentation centrifuge; the fine grain outlet of the sedimentation centrifuge is connected with a concentration system.

The sedimentation centrifuge is introduced, the system is connected to a fine particle outlet of the clean coal cyclone, the sedimentation centrifuge is used for separating fine particles which are separated from the clean coal cyclone once, namely a dilute phase, on one hand, a small amount of coarse particles are inevitably present in the dilute phase at the moment, under the condition that the coarse particles and the fine particles are mixed more complexly at the moment, fine screen slots are more easily formed in the sedimentation centrifuge, and on the other hand, the coarse particles and the fine particles are extruded to form a filter screen by utilizing the high rotating speed of the sedimentation centrifuge, so that coal components and water are separated, more and finer coal components are obtained, on the other hand, more coal components can be further recovered from the dilute phase as far as possible, the coal extraction rate is improved, and compared with the introduction of a flotation process, the construction investment is smaller, the occupied area is small, only one device of the sedimentation centrifuge is needed to be maintained at the later stage, and the operation cost is low.

The coal components and the dilute phase separated by the sedimentation centrifuge respectively pass through a coarse grain outlet and a fine grain outlet to become clean coal or enter a concentration system, and after the dilute phase is concentrated into low-value coal slime by the concentration system, certain product value can be reserved.

Preferably, the system also comprises a medium gangue concentration system, wherein the medium gangue concentration system comprises a medium gangue cyclone, an arc screen and a high-frequency screen; the coarse grain outlet of the coarse slime separator is connected with a medium gangue swirler, the coarse grain outlet of the medium gangue swirler is connected with a sieve bend, and the coarse grain outlet of the sieve bend is connected with a high-frequency sieve.

And (3) performing multi-stage filtration, concentration and dehydration on the coarse grains subjected to primary coarse slime separation by using a middling gangue concentration system to obtain middling, and further distinguishing the quality level of the coarse grains separated from the clean coal cyclone.

Further preferably, the medium gangue cyclone and the fine particle outlet of the arc screen are communicated to a medium gangue barrel.

The coal slime components in the medium gangue barrel can be circularly put into a medium gangue cyclone to obtain more coal components by screening and purify discharged water.

Further preferably, the fine particle outlet of the medium gangue cyclone is connected with a concentration system.

The fine particles separated from the gangue cyclone, namely the dilute phase still contains more coal components which are difficult to be further dehydrated, and the part of dilute phase is directly introduced into a concentration system to be concentrated into low-value coal slime, and part of residual value can be recovered.

Preferably, the dewatering system further comprises a stack of screens, the stack of screens having a fines outlet connected to the thickening system.

The overlapping screen fully dehydrates fine coal from the coarse coal slime sorting machine, and concentrated coal products enter the coarse coal slime sorting machine, so that a dilute phase obtained from a fine particle outlet of the overlapping screen also contains a large amount of coal components, can be concentrated to form low-value coal slime through a connecting concentration system, and can recover a part of residual value.

Further preferably, the stacked screen coarse grain outlet is connected with a centrifuge. The coal product obtained from the coarse grain outlet of the stack sieve is further dehydrated by a centrifuge to obtain a fully dehydrated high-value clean coal product, and the fine grain outlet obtains a coal product with lower value and slightly higher water content. So far, all the coal products obtained by the clean coal concentration cyclone are converted into value products.

Further preferably, the concentration system comprises a coal slurry thickener and a filter press, the dewatering system is connected to the coal slurry thickener, and the coarse grain outlet of the coal slurry thickener is connected with the filter press.

After the coal slurry is concentrated by a coal slurry concentrator and is subjected to filter pressing by a filter press, low-value coal slurry with high coal component content and a water phase can be obtained, the water phase can be recycled, and part of coal component values can be recovered from the coal slurry.

Preferably, the sedimentation centrifuge comprises a power system, a machine body, a rotor, a screen basket and a feeding pipe, wherein the rotor is arranged in the machine body, one end of the rotor is connected with the power system, and the other end of the rotor is connected with the screen basket; the feeding pipe is communicated to the screen basket.

The rotor is matched with a power system for transmission, a speed reduction process is avoided, and the rotating speed of the screen basket is higher, so that dilute phase from a fine particle outlet of the clean coal concentration cyclone can be screened, and more coal components can be obtained.

Preferably, the sedimentation centrifuge further comprises a pushing device, the pushing device comprises a push rod and a push plate, the push rod is arranged in the center of the rotor, one end of the push rod is connected with the bottom of the push plate, the other end of the push rod is connected with a hydraulic device, and the push plate is arranged in the screen basket.

The coarse grains left in the screen basket, namely the coal components are pushed out of the screen basket by the aid of the material pushing device, and collection is facilitated.

Further preferably, the rotating speed of the sedimentation centrifuge is 1500 to 2000rpm.

The fine particles from the clean coal cyclone are better suitable at the optimized rotating speed, namely the dilute phase, so that the coarse particles and the fine particles obtained at the fine particle outlet can be matched with each other to generate higher particle superposition degree, a sufficiently fine screen gap is formed, and coal components with the particle size of more than 0.075mm can be obtained in field application, and the recovery rate and the dehydration effect of the coal are obviously improved.

Compared with the prior art, the utility model discloses the beneficial effect who has is: the sedimentation centrifuge is additionally arranged and matched with the clean coal concentrator to replace a complex flotation process, so that the early investment and the later maintenance cost are saved, and the coal recovery rate is improved; the dewatering system is matched with the concentration system, so that the purification effect of water is improved, the water is recycled, the water is saved, the low-value coal slime is recycled, and the total value of the final coal slime can be improved.

Drawings

FIG. 1 is a schematic diagram of a washing system in a fine coal slurry deep upgrading system.

FIG. 2 is a schematic diagram of a concentration system in a fine coal slurry deep upgrading system.

FIG. 3 is a schematic diagram of a decanter centrifuge.

Wherein, 1, clean coal swirler; 2. a coarse slime separator; 3. stacking and screening; 4. a dewatering centrifuge; 5. a medium mixing barrel; 6. a sedimentation centrifuge; 7. a refined coal barrel; 8. a medium gangue swirler; 9. a curved screen; 10. a high-frequency sieve; 11. a middle gangue barrel; 12. a medium coal bucket; 13. a coal slime thickener; 14. a filter press; 15. a coal slime barrel; 16. a circulating water tank; 17. a clean water tank; 18. a body; 19. a rotor; 20. a material pushing device; 21. a screen basket; 22. and a feeding pipe.

The "+" shown in figures 1 and 2 is the coarse outlet and the "-" shown is the fine outlet.

Detailed Description

The present invention will be further described with reference to FIG. 1~3.

Referring to the attached FIG. 1~2: a fine coal slime deep upgrading system comprises a dehydration system and a concentration system, wherein the dehydration system comprises a clean coal swirler 1, a coarse coal slime sorting machine 2, a stacking sieve 3, a dehydration centrifugal machine 4, a medium combining barrel 5, a sedimentation centrifugal machine 6, a clean coal barrel 7, a medium gangue swirler 8, an arc sieve 9, a high-frequency sieve 10, a medium gangue barrel 11 and a medium coal barrel 12; the bottom of the clean coal swirler 1 is connected with the coarse coal slime separator 2, and the top of the clean coal swirler 1 is connected with the sedimentation centrifuge 6; a fine particle outlet of the coarse slime separator 2 is connected with a stacked sieve 3, a coarse particle outlet of the stacked sieve 3 is connected with a dewatering centrifuge 4, a fine particle outlet of the dewatering centrifuge 4 is communicated to a medium combining barrel 5, and coarse particle outlets of the dewatering centrifuge 4 and a sedimentation centrifuge 6 are communicated to a fine coal barrel 7; a coarse grain outlet of the coarse coal slime sorting machine 2 is connected with a medium gangue swirler 8, a coarse grain outlet of the medium gangue swirler 8 is communicated to an arc screen 9, a coarse grain outlet of the arc screen 9 is communicated to a high-frequency screen 10, a coarse grain outlet of the high-frequency screen 10 is communicated to a medium coal bucket 12, and fine grain outlets of the arc screen 9 and the high-frequency screen 10 are communicated to a medium gangue bucket 11. The fine particle outlet of the stacked screen 3, the fine particle outlet of the sedimentation centrifuge 6 and the fine particle outlet of the medium gangue cyclone 8 are communicated to a concentration system.

The concentration system comprises a coal slime thickener 13, a filter press 14, a coal slime barrel 15, a circulating water tank 16 and a clean water tank 17; two coal slime thickeners 13 are arranged in parallel, and one is in a normally closed state and is used as an accident thickener; a coarse grain outlet of the coal slime thickener 13 is communicated with the filter press 14, a coarse grain outlet of the coal slime thickener 13 is communicated with the coal slime barrel 15, a fine grain outlet of the coal slime thickener 13 is communicated with the circulating water tank 16, the circulating water tank 16 is connected with the clean water tank 17, and a fine grain outlet of the filter press 14 is connected with the clean water tank 17.

After the coal slime water enters a magnetic separator to recover media in the fine coal medium removal screening stage, the tail coal slime water enters a fine coal swirler 1 to be concentrated to obtain coal slime of two parts of overflow and underflow of the swirler, wherein the overflow flows out from a fine particle outlet of the fine coal swirler 1, and the underflow flows out from a coarse particle outlet of the fine coal swirler 1.

The underflow of the clean coal swirler 1, namely coarse particles with the particle size of more than 0.3mm, enters the coarse coal slime sorting machine 2 from a coarse particle outlet for sorting, fine particles with the particle size of 0.3 to 5mm obtained by sorting through the coarse coal slime sorting machine 2 enter the superposed screen 3 through a fine particle outlet, the coarse particles with the particle size of more than 0.3mm obtained by screening through the superposed screen 3 enter the dewatering centrifuge 4 for dewatering, the coarse particles with the particle size of more than 0.35mm are clean coal and enter the clean coal barrel 7, the fine particles enter the medium combining barrel 5 to continue to circulate in the system, and finally, the fine particles enter the overflow in the subsequent link. Wherein, fine particles with the size of less than 0.3mm obtained by the sieve stack 3 enter a concentration system from a fine particle outlet.

The overflow of the clean coal cyclone 1, namely the fine particles with the particle size of less than 0.3mm, enters a sedimentation centrifuge 6 from a fine particle outlet, the coal slurry with the particle size of more than 0.075mm flows out from a coarse particle outlet and enters a clean coal bucket 7 after the sedimentation centrifuge 6 is further separated and dehydrated, and the coal slurry with the particle size of less than 0.075mm enters a concentration system from a fine particle outlet.

Coarse grains with the grain size of more than 5mm obtained from a coarse grain outlet of the coarse slime separator 2 enter a middle gangue swirler 8, the middle gangue swirler 8 is used for separating coarse grains with the grain size of more than 0.3mm and fine grains with the grain size of less than 0.3mm, the coarse grains enter an arc screen 9 through the coarse grain outlet for dehydration, the fine grains with the grain size of less than 0.35mm obtained by dehydration of the arc screen 9 enter a middle gangue barrel 11, the coarse grains with the grain size of more than 0.35mm enter a high-frequency screen 10 from the coarse grain outlet for dehydration, the further obtained fine grains with the grain size of less than 0.35mm enter the middle gangue barrel 11 through the fine grain outlet, and the coarse grains with the grain size of more than 0.35mm enter a middle gangue barrel 12 to obtain middlings.

Coal slime with the particle size of below 0.3mm obtained from a fine particle outlet of the medium gangue cyclone 8 enters a concentration system.

The coal slurry entering the concentration system enters a coal slurry concentrator 13 for concentration, the coal slurry obtained from the coarse grain outlet is subjected to pressure filtration by a pressure filter 14 to obtain a final coal slurry product, a liquid phase discharged from a fine grain outlet of the coal slurry concentrator 13 sequentially enters a circulating water tank 16 and a clean water tank 17 to be used as circulating water for later use, and the liquid phase obtained from the fine grain outlet of the pressure filter 14 can directly enter the clean water tank 17. Two coal slime thickeners 13 are arranged in parallel and alternately concentrate the coal slime.

Wherein, the coarse slime separator 2 is externally connected with spray water, and the clean water tank 17 is externally connected with supplementary water. The coal slime in the intermediate gangue barrel 11 can enter an intermediate gangue cyclone 8 in a recycling mode to be further screened to obtain high-moisture fine coal slime or intermediate coal.

Referring to FIG. 3: the centrifugal speed of the sedimentation centrifuge 6 is 1700rpm. The sedimentation centrifuge 6 comprises a power system, a machine body 18, a rotor 19, a material pushing device 20, a screen basket 21 and a feeding pipe 22, wherein the rotor 19 is arranged in the machine body 18, one end of the rotor is connected with the power system, and the other end of the rotor is connected with the screen basket 21; the feeding pipe 22 is communicated to the screen basket 21; the pushing device 20 comprises a push rod and a push plate, the push rod is arranged in the center of the rotor 19, one end of the push rod is connected with the bottom of the push plate, the other end of the push rod is connected with a hydraulic device, and the push plate is arranged in the screen basket 21.

The power system directly transmits the power to the screen basket 21 through the rotor 19 without a speed reduction process, so that the rotating speed is greatly improved, the power system is matched with a dilute phase at a fine particle outlet of the clean coal cyclone 1, the requirement on consistency is reduced, meanwhile, the pushing device 20 is pushed by a hydraulic device, so that solid materials screened in the screen basket 21 can be pushed out, the size of a screen cut of the screen basket 21 is 0.1mm, and coal slime with the size of more than 0.075mm can be obtained. The dilute phase from the fine particle outlet of the clean coal cyclone 1 is guided into the screen basket 21 through the feeding pipe 22, the screen basket 21 rotates at a high speed, coal particles in the dilute phase cover the wall of the screen basket 21 under the action of centrifugal force to form a tiny screen gap, water passes through the screen gap, the coal particles are retained in the screen basket 21, and due to the fact that an overflow part from the clean coal cyclone 1 still contains part of coarse particles and is matched with the fine particles, a fine screen gap can be formed quickly at a high rotating speed, and most of coal components are retained.

In the above steps, the undescribed medium coal slime recovery system, concentration and filter pressing, circulating water, water replenishing, detection, control, electrical and other systems are conventional technologies.

By adopting the scheme, a sedimentation centrifuge 6 at 1700rpm is additionally arranged aiming at the fine-grained coal slime difficult to recover, the fine grains obtained by concentration cyclone are directly separated, the coal products with the grain size of more than 0.075mm can be further separated by utilizing the sedimentation centrifuge with the 1700rpm high rotating speed, the separated coarse-grained coal slime can obtain clean coal products, and the water-containing fine grains are subjected to concentration and filter pressing to be used as coal slime products. The main advantages of the recovery process are: different from a flotation process, the method has the advantages of large investment in the early stage, large occupied area, complex process, difficult later maintenance, high cost of materials such as reagents and the like. The process is simple, the investment is small, the occupied area is small, and the later maintenance and the input materials are few. The coarse-grained product is further recovered, the coal slime with the grain diameter of more than 0.075mm is reserved, the recovery rate of coal components is improved, the initial degree of circulating water is improved, and the product value is effectively improved.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims (10)

1. A fine coal slime deep upgrading system is characterized in that: the system comprises a dehydration system and a concentration system, wherein the dehydration system comprises a clean coal swirler (1), a coarse slime separator (2) and a sedimentation centrifuge (6); a coarse grain outlet of the clean coal cyclone (1) is connected with a coarse coal slime separator (2); a fine particle outlet of the clean coal swirler (1) is connected with a sedimentation centrifuge (6); the fine grain outlet of the sedimentation centrifuge (6) is connected with a concentration system.

2. The fine coal slurry deep upgrading system of claim 1, characterized in that: the device also comprises a medium gangue concentration system, wherein the medium gangue concentration system comprises a medium gangue cyclone (8), an arc screen (9) and a high-frequency screen (10); the coarse coal slime separator (2) is connected with a coarse grain outlet of the medium gangue swirler (8), the coarse grain outlet of the medium gangue swirler (8) is connected with the arc screen (9), and the coarse grain outlet of the arc screen (9) is connected with the high-frequency screen (10).

3. The fine coal slime depth upgrading system of claim 2, characterized in that: the medium gangue cyclone (8) and the fine grain outlet of the arc screen (9) are communicated to a medium gangue barrel (11).

4. The fine coal slime deep upgrading system of claim 2, characterized in that: and a fine particle outlet of the medium gangue cyclone (8) is connected with a concentration system.

5. The fine coal slurry deep upgrading system of claim 1, characterized in that: the dewatering system also comprises a stacked screen (3), and a fine grain outlet of the stacked screen (3) is connected to the concentration system.

6. The fine coal slime deep upgrading system of claim 5, characterized in that: and the coarse grain outlet of the stacked screen (3) is connected with a centrifuge (4).

7. The fine coal slime deep upgrading system of claim 1, characterized in that: the concentrating system comprises a coal slime thickener (13) and a filter press (14), the dewatering system is connected to the coal slime thickener (13), and a coarse grain outlet of the coal slime thickener (13) is connected with the filter press (14).

8. The fine coal slime deep upgrading system of claim 1, characterized in that: the sedimentation centrifuge (6) comprises a power system, a machine body (18), a rotor (19), a screen basket (21) and a feeding pipe (22), wherein the rotor (19) is arranged in the machine body (18), one end of the rotor is connected with the power system, and the other end of the rotor is connected with the screen basket (21); the feeding pipe (22) is communicated with the inside of the screen basket (21).

9. The fine coal slime deep upgrading system of claim 8, characterized in that: the sedimentation centrifuge (6) further comprises a material pushing device (20), the material pushing device (20) comprises a push rod and a push plate, the push rod is arranged in the center of the rotor (19), one end of the push rod is connected with the bottom of the push plate, the other end of the push rod is connected with a hydraulic device, and the push plate is arranged in the screen basket (21).

10. The fine coal slime deep upgrading system of claim 8, characterized in that: the rotating speed of the sedimentation centrifuge (6) is 1500 to 2000rpm.

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