CN109731698B - High-ash and easily-floating fine-grain coal slime column sorting device and method - Google Patents
High-ash and easily-floating fine-grain coal slime column sorting device and method Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000007667 floating Methods 0.000 title claims description 8
- 238000005188 flotation Methods 0.000 claims abstract description 84
- 239000002245 particle Substances 0.000 claims abstract description 52
- 238000007599 discharging Methods 0.000 claims abstract description 33
- 230000002000 scavenging effect Effects 0.000 claims abstract description 28
- 239000006260 foam Substances 0.000 claims abstract description 27
- 238000000926 separation method Methods 0.000 claims abstract description 15
- 239000012141 concentrate Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 48
- 239000010410 layer Substances 0.000 claims description 38
- 238000005507 spraying Methods 0.000 claims description 16
- 239000003250 coal slurry Substances 0.000 claims description 8
- 230000002209 hydrophobic effect Effects 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000033558 biomineral tissue development Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000011084 recovery Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000010878 waste rock Substances 0.000 description 1
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Abstract
A high-ash and easily-floated fine-grain coal slime column sorting device and method are applicable to the technical field of coal slime flotation. Carrying out flotation and desliming on the coal slime by adopting a flotation column with an ultrasonic desliming device and a middling discharge device, carrying out countercurrent collision mineralization on mineralized particles in a trapping region after feeding the materials into the flotation column, and carrying out secondary enrichment on the mineralized particles in a foam layer; the non-mineralized particles continuously descend along the ore pulp, enter a scavenging section of the flotation column for scavenging after being mineralized, the particles with higher density are discharged from the lower part to become tailings, and the particles with lower density rise to a trapping area. An ultrasonic generating device is attached to the periphery of the trapping area, under the action of ultrasonic waves, fine mud attached to the surfaces of coal particles falls off and sinks, and then is discharged along with a middling discharging device to form middling; the clean coal is attached to the bubbles, rises to the foam layer, is discharged along with the concentrate overflow trough after the secondary separation and enrichment of the foam layer, and becomes the concentrate. The device has compact structure, effectively solves the problems of gangue carrying coal and clean coal carrying ash caused by the fine mud for flotation, and is beneficial to optimizing the product structure.
Description
Technical Field
The invention relates to a sorting device and a sorting method, in particular to a high-ash floating-easy fine-grain coal slime column sorting device and a method which are suitable for the technical field of coal slime flotation.
Background
Due to the improvement of the coal mining mode and the production process in China, particularly the wide application of heavy medium separation equipment represented by a cyclone in the coal separation link, the amount of the coal slurry entering the float coal is obviously increased, the resource condition is worsened, and the proportion of the coal slurry with high content of fine mud in the coal slurry entering the float coal is also obviously increased. The extremely fine granularity of the fine mud brings the characteristic of being extremely difficult to remove in the flotation: the selectivity of the foam to extremely fine particles is poor, and fine mud easily enters clean coal, so that the quality of the clean coal is reduced; the fine mud is also entrained into the clean coal foam along with the distribution of water, so that the quality of the clean coal product is reduced; the fine mud is easy to adhere to the surface of the coal particles, so that the hydrophobicity of the coal particles is reduced, and the recovery rate of clean coal is reduced.
The main flotation equipment of the coal preparation plant at present is a flotation machine and a flotation column, the flotation machine has strong recovery capability, but the selectivity of fine mud is poor in a mode of increasing the probability of collision between bubbles and particles by stirring the fine mud to form turbulent flow by an impeller, and the problem that the fine mud is carried into clean coal cannot be solved, so that the quality of a final product is low; the flotation column has better selectivity, the quality of clean coal is higher, but the recovery rate of clean coal is low, and the problem of coarse flotation exists, and in addition, the automatic control level of the flotation column in China is poorer at present, so that the incoming material fluctuation caused by resource deterioration is difficult to deal with, and the large-scale popularization is difficult to realize.
The patent publication numbers are: the method and the equipment for separating the coal slime of CN101773873A take the characteristic that a large amount of coal particles with fine slime attached to the surface are easy to exist in the circulating middling into consideration, and carry out classification and respective treatment on the coal particles, so that the quantity and the quality of clean coal products are improved, but the problem that the clean coal is polluted due to the entrainment of the fine slime and the foam of the clean coal cannot be solved.
Ultrasonic wave is a novel technology, and has the function of scrubbing an interface for a flotation process, and has the function of cleaning the coal particle surface covered by the fine mud and the phenomenon that the fine mud is adhered to the foam surface. Thereby fundamentally providing a feasible technical approach for solving the problems of poor clean coal quality and low clean coal recovery rate caused by excessive content of the fine mud in the float-entering raw coal.
Therefore, it is necessary to develop a new type of efficient and effective equipment for the problems of high fine content coal slurry in float coal slurry, and high quality and quantity of clean coal due to the easy adhesion of fine mud on the surface of coal particles.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide a high-ash easily-floating fine-grain coal slime column separation device and method for treating coal slime with high fine-mud content and high use efficiency and separation effect aiming at the defects of online equipment.
The technical scheme is as follows: the invention relates to a high-ash easily-floated fine coal slime column sorting device which comprises a water spraying device, a clean coal overflow tank, a flotation column, a feeding pipe, an ultrasonic generating device, a middling discharging device, a scavenging column body, a micro-bubble generator, a circulating pump, an underflow hopper-shaped guide pipe and a cyclone pipe, wherein the water spraying device is connected with the clean coal overflow tank;
the top of the flotation column is provided with a water drenching device, the upper part of the outer side of the water drenching device is covered with a clean coal overflow trough, the clean coal overflow trough is provided with a clean ore pipe, an ultrasonic generating device is arranged in the middle of the flotation column, a feeding pipe extends from the top of the flotation column to the ultrasonic generating device in the flotation column, the ultrasonic generating device is arranged at the outlet of the feeding pipe, the inlet of the feeding pipe is the feeding port of the flotation column, a middling discharging device is arranged below the ultrasonic generating device of the flotation column, the middling discharging device is provided with a middling discharging port, the bottom of the middling discharging device of the flotation column is provided with a scavenging cylinder, a funnel structure is arranged below the scavenging cylinder, the bottom of the funnel structure is provided with a tailings pipe, the tangential direction of the joint of the tailings pipe and the funnel structure is provided with an underflow pipeline (E), the junction of the funnel structure and the scavenging cylinder is provided with, the bottom flow bucket-shaped guide pipe extends to the outside through a bottom flow pipeline, the bottom flow pipeline and the rotational flow pipe installed along the tangent line of the outer wall of the cylinder are connected through a pipeline, and the pipeline is provided with a circulating pump and a microbubble generator.
The water spraying device penetrates through the feeding pipe and is arranged at the top of the flotation column; the water spraying device comprises a plurality of water pipe rings of concentric circle structures, the size of the water pipe ring at the center is matched with the size of a feeding pipe, all the water pipe rings are fixedly connected through a cross-shaped water pipe, and a plurality of water outlet holes are formed in the water pipe rings.
The ultrasonic wave generating device is connected with an ultrasonic wave generating motor arranged outside and comprises four layers of concentric circular tubes which are filled in a flotation column, the four layers of concentric circular tubes are matched with the inner diameter of the flotation column, the interlayer spacing of each layer of concentric circular tubes is the same, the projections of the layers of the concentric circular tubes in the vertical direction are overlapped, the concentric circular tubes in each layer are connected by 12 straight tubes with divergent circle centers, vertical tubes are connected between the layers, the layers are finally in a network structure, a space matched with a feeding tube is arranged at the circle center of the ultrasonic wave generating device, and the ultrasonic wave generating device is located at the position of a foam layer in the flotation process when in use and used for removing fine mud entrained in the foam layer by ultrasonic energy.
The middling discharging device is arranged below the ultrasonic generating device, the outermost part is cylindrical, and the lower part of the middling discharging device is provided with an inclined groove, so that middling can be discharged conveniently.
A high-ash and easily-floated fine-grain coal slime column separation method comprises the following steps:
feeding flotation pulp into a flotation column from a feeding port of the flotation column through a feeding pipe, wherein particles in the flotation pulp sink and collide with floating bubbles generated by a micro-bubble generator in the flotation column, and hydrophobic coal particles in the flotation pulp are adhered to the bubbles to mineralize the bubbles;
hydrophilic particles and part of hydrophobic coal particles which are not adhered with bubbles in the flotation pulp continuously sink to a scavenging column body, are collected by an underflow funnel-shaped guide pipe of a funnel structure and are discharged along an underflow pipeline (E) on the side wall, then enter a circulating pump along a preset pipeline in sequence for pressurization, the ore pulp and the particles in the ore pulp pass through a microbubble generator at a high speed by the circulating pump, the microbubble generator is a Venturi tube to cause formation of a large amount of bubbles, and the high-speed ore pulp of the microbubble generator and the air bubbles form extremely disordered flow fields to increase mineralized bubbles;
when a large amount of ore pulp containing mineralized bubbles enters the scavenging cylinder along with the tangent line of the rotational flow pipe installed on the tangent line of the outer wall of the cylinder, rotational flow is formed in the scavenging cylinder, and gangue particles with higher density sink to the tailing pipe along the outside of the rotational flow and are discharged: coal particles with lower density, mineralized bubbles and unmineralized bubbles rise to a trapping area near the area of the ultrasonic generator along the interior of the rotational flow, meet and collide with ore pulp feed of the next batch in the trapping area, finally mineralize and float upwards to form a foam layer, under the action of ultrasonic waves of the ultrasonic generator at the outlet of the feeding pipe, fine mud carried in the foam layer, including covering the surface of the particles or the surface of the bubbles, is vibrated and separated, and then sinks into a scavenging column or enters an inclined groove of a middling discharging device to be discharged to form middling; the water spraying device sprays water to the foam layer, coal particles with ash content not reaching the standard and insufficient fine mud removal on the surface fall to a catching area under the action of water drops, and enter another strand of ore pulp for continuous separation; coal particles with ash content reaching the standard and little or no surface fine mud coverage overflow into a clean coal overflow trough and are discharged from a concentrate pipe.
Has the advantages that: mainly aims at the floating mud with higher content of fine mud, effectively improves the quality and the recovery rate of the flotation clean coal,
according to the invention, the fine mud on the surface of the clean coal in the flotation clean coal foam layer is separated by falling under the action of ultrasonic waves, so that the quality of the flotation clean coal is effectively improved, and the problems of low quality and low recovery rate caused by pollution of the flotation clean coal due to a fine mud cover cap are effectively solved; the middling discharging device provided by the invention takes middling as one of equipment products, so that the problems that more fine mud is carried by clean coal or the ash content of flotation tail coal is low in a flotation process due to the existence of the fine mud are solved, and the fine mud is prevented from entering rotational flow to be circularly mineralized.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention.
Fig. 2 is a schematic top view of the water spraying device in fig. 1.
FIG. 3(a) is a schematic front view of the structure of the middling discharging device of the present invention
Fig. 3(b) is a schematic top view of the middling discharging device according to the present invention.
Fig. 4 is a front view and a top view of the ultrasonic generator shown in fig. 1.
In the figure: 1-a water spraying device, 2-a clean coal overflow trough, 3-a flotation column, 4-a feeding pipe, 5-an ultrasonic generating device, 6-a middling discharging device, 7-a scavenging column, 8-a microbubble generator, 9-a circulating pump, 10-an underflow hopper-shaped flow guide pipe, 11-a rotational flow pipe, an A-flotation column feeding port, a B-a clean ore pipe, a C-middling discharging port, a D-tailing pipe and an E-underflow pipeline.
Detailed Description
The invention is described in further detail below with reference to the drawings, in which:
as shown in figure 1, the high-ash and easily-floated fine-particle coal slime column sorting device is characterized in that: the device comprises a water spraying device 1, a clean coal overflow trough 2, a flotation column 3, a feeding pipe 4, an ultrasonic generating device 5, a middling discharging device 6, a scavenging column 7, a micro-bubble generator 8, a circulating pump 9, an underflow hopper-shaped guide pipe 10 and a cyclone pipe 11;
the top of a flotation column 3 is provided with a water drenching device 1, the upper part of the outer side of the water drenching device 1 is covered with a clean coal overflow trough 2, a clean coal pipe B is arranged on the clean coal overflow trough 2, an ultrasonic generating device 5 is arranged in the middle of the flotation column 3, a feeding pipe 4 extends from the top of the flotation column 3 to the ultrasonic generating device 5 in the flotation column 3, the ultrasonic generating device 5 is arranged at the outlet of the feeding pipe 4, the ultrasonic generating device 5 is connected with an ultrasonic generating motor arranged outside and comprises four layers of concentric circular pipes which are filled in the flotation column 3, the four layers of concentric circular pipes are matched with the inner diameter of the flotation column 3, the layer spacing of each layer of concentric circular pipes is the same and the projections in the vertical direction are overlapped, the concentric circular pipes in each layer are connected by 12 straight pipes with divergent circle centers, vertical pipes are connected between each layer, the concentric circular pipes are in a structure finally, a network space matched with the feeding pipe 4, the ultrasonic wave generating device 5 is positioned at the position of a foam layer in flotation when in use and is used for removing fine mud carried in the foam layer by ultrasonic energy;
the inlet of the feeding pipe 4 is a flotation column feeding port A, and the water spraying device 1 penetrates through the feeding pipe 4 and is arranged at the top of the flotation column 3; the water spraying device 1 comprises a plurality of water pipe rings with concentric circle structures, the size of the water pipe ring at the center is matched with that of the feeding pipe 4, all the water pipe rings are fixedly connected through a cross-shaped water pipe, and a plurality of water outlet holes are formed in the water pipe rings;
the middling discharging device 6 is arranged below the ultrasonic generating device 5 of the flotation column 3, the middling discharging device 6 is provided with a middling discharging port C, the middling discharging device 6 is arranged below the ultrasonic generating device 5, the outermost part of the middling discharging device 6 is cylindrical, the lower part of the middling discharging device is provided with an inclined groove, the middling discharging device is convenient to discharge middling, the bottom of the middling discharging device 6 of the flotation column 3 is provided with a scavenging cylinder 7, a funnel structure is arranged below the scavenging cylinder 7, the bottom of the funnel structure is provided with a tailing pipe D, the tangential direction of the joint of the tailing pipe D and the funnel structure is provided with an underflow pipe E, the junction of the funnel structure and the scavenging cylinder 7 is provided with a plurality of cyclone pipes 11 arranged along the tangent line of the outer wall of the cylinder, the bottom in the funnel structure is provided with an underflow funnel-shaped guide pipe 10, the underflow funnel-shaped guide pipe 10 extends to the, and the pipeline is provided with a circulating pump 9 and a microbubble generator 8.
A high-ash and easily-floated fine-grain coal slime column separation method is characterized by comprising the following steps:
feeding flotation pulp into a flotation column 3 from a flotation column feeding port A through a feeding pipe 4, wherein particles in the flotation pulp sink and collide with floating bubbles generated by a micro-bubble generator 8 in the flotation column 3, and hydrophobic coal particles in the flotation pulp are adhered to the bubbles to mineralize the bubbles;
hydrophilic particles and part of hydrophobic coal particles which are not adhered with bubbles in the flotation pulp continuously sink to the scavenging column body 7, are collected by an underflow funnel-shaped guide pipe 10 of a funnel structure and are discharged along an underflow pipeline E on the side wall, then sequentially enter a circulating pump 9 along a preset pipeline for pressurization, the ore pulp and the particles in the ore pulp pass through a microbubble generator 8 at a high speed by the circulating pump 9, the microbubble generator 8 is a Venturi tube to cause the formation of a large number of bubbles, and mineralized bubbles are increased in the microbubble generator 8 due to the extremely turbulent flow field formed by the bubbles and the high-speed ore pulp of the ore pulp;
when a large amount of ore pulp that contains mineralize mineralization bubble forms the whirl wherein after 11 tangents of cyclone tube entering scavenging cylinder 7 through cylinder outer wall tangent installation, the higher waste rock granule of density sinks to tailing pipe D along the whirl outside and discharges: coal particles with lower density, mineralized bubbles and unmineralized bubbles rise to a trapping area near the area of the ultrasonic generator 5 along the interior of the rotational flow, meet and collide with the ore pulp feed of the next batch in the trapping area, finally mineralize and float upwards to form a foam layer, under the action of ultrasonic waves of the ultrasonic generator 5 at the outlet of the feeding pipe 4, fine mud carried in the foam layer, including covering the surface of the particles or the surface of the bubbles, is effectively vibrated and separated, and then sinks into a scavenging column 7 or enters an inclined groove of a middling discharging device C to be discharged to be middling; the water spraying device 1 sprays water to the foam layer, coal particles with ash content not reaching the standard and insufficient fine mud removal on the surface fall to a catching area under the action of water drops, and enter another strand of ore pulp for continuous separation; coal particles with ash content reaching the standard and little or no fine mud covering on the surface overflow into the clean coal overflow chute 2 and are discharged from the concentrate pipe B.
The specific working process is as follows:
feeding the ore pulp to be floated into a flotation column 3 from a flotation column feeding port A through a feeding pipe 4, wherein particles in the ore pulp sink and collide with floating bubbles generated by a hydrodynamic cavitation pipe in the flotation column 3, and most of hydrophobic coal particles in the ore pulp are adhered to the bubbles to mineralize the bubbles; hydrophilic particles and part of hydrophobic coal particles which cannot be adhered with bubbles in ore pulp continuously sink to a scavenging cylinder 7, are collected by an underflow hopper-shaped guide pipe 10 of a funnel structure and are discharged along a pipeline E on the side wall, then enter a circulating pump 9 along a preset pipeline in sequence for pressurization, the circulating pump 9 enables the ore pulp and the particles in the ore pulp to pass through a microbubble generator 8 at a high speed, a Venturi tube device in the microbubble generator 8) causes a large amount of bubbles to be formed, an extremely turbulent flow field causes a certain amount of mineralized bubbles to be generated, when a large amount of ore pulp containing bubbles enters the scavenging cylinder 7 along a tangent line of a cyclone tube 11 installed through a tangent line of the outer wall of the cylinder, a cyclone is formed in the ore pulp, and gangue particles with higher density sink to a tailing tube D along the outside the cyclone and are discharged: coal particles with lower density, mineralized bubbles and unmineralized bubbles rise to a trapping area along the interior of the rotational flow, and meet and collide with the next batch of feed materials in the trapping area to finally mineralize and float upwards to form a foam layer, an ultrasonic generator 5 is arranged at the outlet of a feed pipe 4, fine mud (covering the surface of the particles or the surface of the bubbles) carried in the foam layer is effectively vibrated and separated under the action of ultrasonic waves, and then the fine mud sinks to a scavenging area or C is discharged by a middling discharging device to form middling; a water spraying device 1 is arranged at the uppermost part of the foam layer, under the action of water dripping below the foam layer, coal particles with ash content not reaching the standard and insufficiently removed fine mud on the surface fall to a trapping area and enter another strand of ore pulp again; coal particles with ash content reaching the standard and little or no fine mud covering on the surface overflow into the clean coal overflow chute 2 and are discharged from the concentrate pipe B.
Claims (5)
1. The utility model provides a high ash easily floats fine grain coal slime post sorting unit which characterized in that: the device comprises a water spraying device (1), a clean coal overflow trough (2), a flotation column (3), a feeding pipe (4), an ultrasonic generating device (5), a middling discharging device (6), a scavenging column body (7), a micro-bubble generator (8), a circulating pump (9), an underflow hopper-shaped guide pipe (10) and a cyclone pipe (11);
the top of the flotation column (3) is provided with a water drenching device (1), the upper part of the outer side of the water drenching device (1) is covered with a clean coal overflow trough (2), the clean coal overflow trough (2) is provided with a clean ore pipe (B), an ultrasonic generating device (5) is arranged in the middle of the flotation column (3), a feeding pipe (4) extends into the ultrasonic generating device (5) in the flotation column (3) from the top of the flotation column (3), the ultrasonic generating device (5) is arranged at the outlet of the feeding pipe (4), the inlet of the feeding pipe (4) is a flotation column feeding port (A), a middling discharging device (6) is arranged below the ultrasonic generating device (5) of the flotation column (3), the middling discharging device (6) is provided with a middling discharging port (C), the bottom of the middling discharging device (6) of the flotation column (3) is provided with a scavenging column body (7), and a funnel structure is arranged below the scavenging column (7), funnel structure bottom is equipped with tailing pipe (D), tailing pipe (D) is equipped with underflow pipeline (E) with funnel structural connection department tangential direction, funnel structure is equipped with a plurality of whirl pipes (11) of installing along cylinder outer wall tangent with scavenging cylinder (7) juncture, the internal bottom of funnel structure is underflow bucket shape honeycomb duct (10), underflow bucket shape honeycomb duct (10) extend to the outside through underflow pipeline (E), through the tube coupling between underflow pipeline (E) and whirl pipe (11) of installing along cylinder outer wall tangent, be equipped with circulating pump (9) and microbubble generator (8) on the pipeline.
2. The high-ash floating-prone fine-grained coal slurry column separation device according to claim 1, characterized in that: the water spraying device (1) penetrates through the feeding pipe (4) and is arranged at the top of the flotation column (3); the water spraying device (1) comprises a plurality of water pipe rings of concentric circle structures, the size of the water pipe ring at the center is matched with that of the feeding pipe (4), all the water pipe rings are fixedly connected through the cross-shaped water pipe, and the water pipe rings are provided with a plurality of water outlet holes.
3. The high-ash floating-prone fine-grained coal slurry column separation device according to claim 1, characterized in that: the ultrasonic wave generating device (5) is connected with an ultrasonic wave generating motor arranged outside and comprises four layers of concentric circular tubes which are filled in a flotation column (3), the four layers of concentric circular tubes are matched with the inner diameter of the flotation column (3), the interlayer spacing of each layer of concentric circular tubes is the same and is overlapped with the projection in the vertical direction, the concentric circular tubes of each layer are connected by 12 straight tubes with circle centers diverging, vertical tubes are connected between each layer, the concentric circular tubes are finally in a network structure, a space matched with a feeding tube (4) is arranged at the circle center of the ultrasonic wave generating device (5), and the ultrasonic wave generating device (5) is positioned at a foam layer position in the flotation process when in use and used for removing fine mud carried in the foam layer by ultrasonic energy.
4. The high-ash floating-prone fine-grained coal slurry column separation device according to claim 1, characterized in that: the middling discharging device (6) is arranged below the ultrasonic generating device (5), the outermost part is cylindrical, and the lower part of the middling discharging device is provided with an inclined groove, so that middling can be discharged conveniently.
5. A high-ash floating-easy fine-grain coal slime column separation method using the high-ash floating-easy fine-grain coal slime column separation device of claim 1 is characterized by comprising the following steps of:
feeding flotation pulp into a flotation column (3) from a flotation column feeding port (A) through a feeding pipe (4), wherein particles in the flotation pulp sink and collide with floating bubbles generated by a micro-bubble generator (8) in the flotation column (3), and hydrophobic coal particles in the flotation pulp are adhered to the bubbles to mineralize the bubbles;
hydrophilic particles and part of hydrophobic coal particles which are not adhered with bubbles in the flotation pulp continuously sink to a scavenging cylinder (7), are collected by an underflow funnel-shaped guide pipe (10) of a funnel structure and are discharged along an underflow pipeline (E) on the side wall, then sequentially enter a circulating pump (9) along a preset pipeline for pressurization, the pulp and the particles in the pulp pass through a microbubble generator (8) at a high speed by the circulating pump (9), the microbubble generator (8) is a Venturi tube to cause the formation of a large number of bubbles, and mineralized bubbles are increased in the microbubble generator (8) due to the extremely turbulent flow field formed by the bubbles and the high-speed pulp of the pulp;
when a large amount of ore pulp containing mineralized bubbles enter the scavenging cylinder (7) along with the tangent line of the cyclone tube (11) installed on the tangent line of the outer wall of the cylinder to form a cyclone, gangue particles with higher density sink to the tailing tube (D) along the outside of the cyclone and are discharged: coal particles with lower density, mineralized bubbles and unmineralized bubbles rise to a trapping area near the area of the ultrasonic generating device (5) along the interior of the rotational flow, meet and collide with the ore pulp fed in the next batch in the trapping area, finally mineralize and float upwards to form a foam layer, under the action of ultrasonic waves of the ultrasonic generating device (5) at the outlet of the feeding pipe (4), fine mud carried in the foam layer is effectively separated by covering the surface of the particles or the surface of the bubbles through vibration, and then sinks into a scavenging column body (7) or enters an inclined groove of a middling discharging device (C) to be discharged into middling; the water spraying device (1) sprays water to the foam layer, coal particles with ash content not reaching the standard and insufficient fine mud removal on the surface fall to a trapping area under the action of water drops, and enter another strand of ore pulp for continuous separation; coal particles with ash content reaching the standard and little or no surface fine mud coverage overflow into the clean coal overflow trough (2) and are discharged from the concentrate pipe (B).
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| CN110479501A (en) * | 2019-09-20 | 2019-11-22 | 鞍钢集团矿业有限公司 | A kind of subparticle nano bubble method for floating and system |
| CN110586311B (en) * | 2019-10-24 | 2021-11-26 | 中国矿业大学 | Fine coal sound field fluidized bed separation method and device |
| CN110935204B (en) * | 2019-12-13 | 2022-02-18 | 安徽理工大学 | Rake-free concentration device |
| CN110935210B (en) * | 2019-12-13 | 2021-12-03 | 安徽理工大学 | Compact type multistage rake-free concentration device |
| CN111841868B (en) * | 2020-07-17 | 2022-04-12 | 郑州大学 | Hydraulic flotation equipment and dredging method thereof |
| CN117299375B (en) * | 2023-10-24 | 2024-03-08 | 西安科技大学 | Device and method for sorting coal gasification fine slag by ultrasonic cavitation and oil agglomeration |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SU588004A1 (en) * | 1973-11-11 | 1978-01-15 | Броннецкая Геолого-Геохимическая Экспедиция Института Минералогии, Геохимии И Кристаллохимии Редких Элементов | Column-type flotation machine |
| CN102441494B (en) * | 2011-09-28 | 2013-08-07 | 株洲市兴民科技有限公司 | One-machine flotation method and device |
| CN202725337U (en) * | 2012-08-24 | 2013-02-13 | 黑龙江科技学院 | Ultrasonic fluidization flotation column for graphite |
| CN105689155B (en) * | 2016-04-08 | 2017-10-24 | 中国矿业大学 | Multi-product flotation column separation equipment and method |
| CN206334765U (en) * | 2016-10-31 | 2017-07-18 | 中国矿业大学 | Flotation column |
| CN206276507U (en) * | 2016-12-14 | 2017-06-27 | 华北理工大学 | A kind of utilization flotation column reclaims the device of carbon from blast furnace gas mud |
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2019
- 2019-03-15 CN CN201910196303.8A patent/CN109731698B/en active Active
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