WO2022062165A1

WO2022062165A1 - Three-product flotation column and method suitable for high-ash fine-grained coal slime

Info

Publication number: WO2022062165A1
Application number: PCT/CN2020/132023
Authority: WO
Inventors: 桂夏辉; 刘金成; 代世琦; 邢耀文; 曹亦俊; 丁世豪; 刘秦杉; 包西程
Original assignee: 中国矿业大学
Priority date: 2020-09-27
Filing date: 2020-11-27
Publication date: 2022-03-31
Also published as: CN112337655A; CN112337655B

Abstract

A three-product flotation column and method suitable for high-ash fine-grained coal slime recovery, relating to the technical field of coal recovery. The three-product flotation column comprises an inner-layer column body and an outer-layer column body; a clean coal collection tank a(4) and a feeding pipe are provided on the top of the inner-layer column body; clean coal collection tanks b(8) are provided on the periphery of the top of the outer-layer column body; a stepped jet device (9) is provided at the bottom end of the feeding pipe; a flow baffle plate (10) is provided directly below the stepped jet device (9) and in the inner-layer column body; the upper opening of the inner-layer column body is provided with a plurality of upper water spraying devices around the feeding pipe; the bottom of the inner-layer column body is provided with L-shaped coarse grain recovering channels (5) that are communicated with the outside of the inner-layer column body; the clean coal collection tanks b(8) and outer-layer top water spraying devices (7) are arranged around the opening position of the outer-layer column body; a foam layer vibrating mechanism is provided at a position below each clean coal collection tank b(8) and on the same horizontal plane of the inner-layer column body and the outer-layer column body; inclined flow distribution plates (11) having an annular structure are arranged in the outer-layer column body; and an annular middling coal product collection tank (12) is reserved between each inclined flow distribution plate (11) and the inner-layer column body. The present invention is strong in recovery capacity, strong in coal quality adaptability, and high in separation precision.

Description

A three-product flotation column and method suitable for high-ash fine-grained slime

Technical field

The invention relates to a three-product flotation column and a method, and is especially suitable for a three-product flotation column and method used in the field of mineral flotation technology, which is suitable for high-ash fine-grained coal slime.

Background technique

my country's energy structure is "rich in coal, lean in oil, and less in gas", which determines that coal has become the backbone of my country's energy and will occupy the dominant position for a long time in the future. With the continuous increase of the degree of mechanized coal mining, the continuous deepening of mine mining, the continuous deterioration of coal storage geological conditions and the continuous promotion of hydraulic coal mining, a large number of clay minerals represented by layered silicates in coal seams are mixed into raw coal.

At present, the coal preparation plant usually uses a classification cyclone to classify the coal slime with a particle size of 0.25mm, and the coal slime of -0.25mm enters the flotation. Due to the deterioration of coal resources and the continuous improvement of the coal slime water system, the particle size composition of the floating coal slime has undergone great changes, the content of fine-grained -0.074mm has increased significantly, and the coal slime particle size has become finer. The fine and easily sludged clay minerals are easily entrained by water flow or mechanical cover into the foam layer during the flotation process, contaminating clean coal products. The continuous deterioration of the coal slime flotation environment has brought new challenges to the realization of high-precision separation of coal slime, and the problem of difficult separation of coal slime has become more prominent.

The conventional flotation column has a good separation effect on -0.074mm slime, but due to the dynamic circulation of part of the high ash fine slime in the flotation column, the separation effect on the slime rich in high ash fine slime is not good. At the same time, when solving the pollution problem of high-ash fine mud on clean coal, the phenomenon of "running coarse" will occur. Thereby, the yield of flotation clean coal is reduced, and the ash content of tail coal products is reduced, and the flotation process runs ill.

Therefore, based on the production status of the increasing fine mud content in the flotation feed and the problem that it is difficult for conventional flotation equipment to continue to efficiently recover For particle size slime separation, new flotation columns containing clean coal, medium coal and gangue are in urgent need of development.

SUMMARY OF THE INVENTION

Technical problem: The purpose of the present invention is to provide a three-product flotation column and method suitable for high-ash and fine-grained slime with stable operation, strong recovery ability, strong adaptability to coal quality and high separation accuracy.

Technical scheme: The three-product flotation column of the present invention, which is suitable for the recovery of high-ash and fine-grained slime, includes an inner layer column and an outer layer column. The upper opening of the outer layer column is lower than the inner layer column, and the inner layer column. The cylinder and the outer cylinder are nested inside and outside. The top of the inner cylinder is provided with a clean coal collection groove a and a feeding pipe, and the top of the outer cylinder is provided with a clean coal collection groove b, where the clean coal is collected. The groove b surrounds the inner layer cylinder; the feeding pipe vertically enters the inner layer cylinder from the top of the inner layer cylinder, the bottom end of the feeding pipe is provided with a stepped jet, and the inner layer is directly below the stepped jet There is a baffle plate in the cylinder, and the upper opening of the inner cylinder is provided with a plurality of upper water spraying devices around the feeding pipe. The device is a ring-shaped spray device. There are multiple water pipes vertically spaced below the top spray water device of each inner layer. The water pipes are provided with multiple layers of downwardly inclined inclined plates at equal intervals. There are a plurality of spray water nozzles inside, and the inclined plates of the plurality of water pipes form a multi-layer overlapping funnel structure. The bottom of the funnel is provided with an L-shaped coarse-grain recovery channel that communicates with the inner cylinder, and the vertical part of the L-shaped channel is provided with Elastic device, the bottom of the inner cylinder is a funnel structure and is provided with an underflow pipe to communicate with the outside world; a clean coal collection groove b is arranged around the opening of the outer cylinder, and a plurality of outer top sprays are arranged above the opening of the outer cylinder The water spraying device, the position below the clean coal collection tank b is provided with a foam layer vibration mechanism on the same level as the inner cylinder and the outer cylinder, and the outer cylinder is located below the L-shaped coarse particle recovery channel outlet of the inner cylinder There is an inclined flow distribution plate with annular structure, and an annular space is left between the inclined flow distribution plate and the inner layer cylinder. The annular space constitutes a medium-coal product collection tank communicating with the outside world. There is a water inlet at the bottom.

The foam layer vibration mechanism includes a sieve plate arranged on the same level of the inner layer cylinder and the outer layer cylinder, and the sieve plate is connected with an electromagnetic exciter; Clear water is rich in air bubbles.

The elastic device is a wave expansion joint.

The inclination angle of the inclined plate is 30-60°, preferably 45°; the interval of the inclined plate is 5-15cm, preferably 10cm; the inclination angle of the inclined flow distribution plate is 10-30°, preferably 20°.

The counter-current collision mineralization device at the top of the feeding pipe of the inner layer cylinder, the counter-current collision mineralization device includes a casing, and the casing is provided with a plurality of ore slurry nozzles with opposite nozzles, and the top of each slurry nozzle is provided with There is an air pipeline outlet, and a slurry outlet at the bottom is connected to the feeding pipe of the inner column.

The number of slurry nozzles of the countercurrent collision mineralization device is 4-6, preferably 5.

The counter-current collision mineralization device connected to the feeding pipe divides the inhaled air into microbubbles and dissolves in the high-turbulence slurry, and completes high-efficiency mineralization during the countercurrent collision process. The mineralized pulp passes through the feeding pipe. The second-stage stepped jet at the tail realizes secondary mineralization and further improves the mineralization efficiency.

A flotation method for a three-product flotation column suitable for high-ash fine-grained slime recovery, the steps of which are as follows:

a Close the outlet of the bottom flow pipe and the medium-coal product collection tank, and fill the inner cylinder with flotation slurry through the feeding pipe. A stable rising two-phase flow is formed after being uniformly dispersed by the flow distribution plate;

b. The flotation slurry level in the inner cylinder needs to be adjusted at any time to control the thickness of the foam layer and maintain the height of the foam layer to maintain a dynamic balance during the entire slime flotation process; after the foam layer is formed above the inner cylinder, Start the countercurrent collision mineralization device to input the flotation slurry to the stepped jet at the bottom through the feeding pipe, and open the outlet of the bottom flow pipe and the medium-coal product collection tank at the same time, and the flotation slurry accelerates and hits the baffle through the stepped jet. The flotation slurry that hits the baffle bounces and is evenly suspended and distributed in the inner column. The bottom flow pipe is discharged as tailing coal; the coal slime entering the foam layer is suspended upward, and under the coupling action of the foam layer vibration mechanism, the multi-layer annular inclined plate and the spray water sprayed by the spray water device at the top of the inner layer, the inner layer of the foam layer is finely divided. The desorption of mud and a small amount of coarse particles, and the clean coal foam layer formed after desorption of fine mud enters the clean coal collection tank through overflow, and finally the clean coal product a is discharged from the clean coal collection tank;

c The fine mud and some coarse particles falling on the inclined plate quickly slide into the coarse particle recovery channel along the inclined plate under the action of the spray water of the spray water nozzle, thereby reducing the dynamic circulation of the fine mud and purifying the floating of the inner column. choose the environment;

d The fine mud and coarse particles discharged from the coarse particle recovery channel enter the outer column, and part of the fine mud and coarse coal particles under the action of the rising two-phase flow rise into the foam layer, and the rising two-phase flow and the outer layer Under the dual action of the spray water of the top spray water device, the fine mud and the foam carrying the coarse coal particles are effectively separated, and the foam carrying the coarse coal particles is discharged through the clean coal collection tank b to obtain the clean coal product b, and the fine mud is under the action of gravity. It falls on the inclined flow distribution plate and slides down into the medium coal product collection tank to be discharged as medium coal product.

The coarse particle recovery channel increases the elastic limit of the coarse particle recovery channel itself through the wave expansion joint arranged in the middle, and reduces the damage to the coarse particle recovery channel caused by the vibration generated by the vibration mechanism of the foam layer.

The coal particles in the flotation slurry are high ash fine particles, and the flotation effect of coal particles in the range of -0.074mm is obviously better than that of conventional flotation equipment.

Beneficial effects:

The application is provided with inner and outer double-layer cylinders nested inside and outside, so as to realize the step-by-step flotation of coal slime. The low-density clean coal products and high-density gangue minerals are pre-separated in the inner column to improve the clean coal quality. The separated fine mud and part of the coarse particles enter the outer column through the L-shaped channel to recover the coarse particles separately, which not only avoids the loss of medium coal in the tailings, but also avoids the pollution of the fine coal to the clean coal, and realizes resource benefits. Maximized; high-efficiency mineralization of bubbles is achieved through the countercurrent collision mineralization device, and the mineralized ore pulp realizes secondary mineralization through the ladder jet, and the use of baffles can provide upward flow on the one hand to ensure that the particles are evenly suspended in the inner layer Cylinder, thus providing a good flotation environment; on the other hand, it can prevent the slurry from being directly discharged from the tailings mouth without flotation, that is, prevent the "short circuit" of the slurry and reduce waste; the inclined plate is arranged in the inner column to cooperate with the inner column The spray water pipe at the top realizes the secondary enrichment of clean coal products and improves the quality of clean coal products; the vibration mechanism is used to reduce the fine mud on the surface of the coal particles and strengthen the desorption of the fine mud on the surface of the bubbles. The desorbed fine mud and part of the coarse particles are sent to the outer column through the L-shaped coarse particle recovery channel, and the lost coarse particles are recovered in the outer column. And use the wave expansion joint to increase the elastic limit of the coarse grain recovery channel itself, reduce the damage to the coarse grain recovery channel caused by the vibration generated by the vibration mechanism of the foam layer, prolong the service life, and ensure the stable performance of the equipment; use the flow plate to buffer, while avoiding Coarse-grained slime in the slurry directly enters the medium coal collection tank without sorting due to inertial action; the gas-liquid two-phase flow formed by the outer bubble generator is uniformly dispersed by the flow distribution plate to form a stable rising two-phase flow, providing stable The flotation fluid selection environment.

Description of drawings:

FIG. 1 is a schematic structural diagram of a three-product flotation column suitable for the recovery of high-ash and fine-grained slime according to the present invention.

Figure 2 is an A-A view of a three-product flotation column suitable for high-ash fine-grained slime recovery according to the present invention.

Fig. 3 is a partial enlarged view of the inclined plate and the water spray nozzle of the present invention.

FIG. 4 is a top view of the countercurrent collision mineralization device of the present invention.

In the picture: 1- Countercurrent collision mineralization device, 2- Inner top spray water device, 3- Inclined plate, 4- Clean coal collection tank a, 5- Coarse particle recovery channel, 6- Electromagnetic vibration exciter, 7- Outer layer top spray water device, 8-clean coal collection tank b, 9-step jet, 10-baffle plate, 11-inclined flow distribution plate, 12-medium coal product collection tank, 13-water inlet, 14 - Underflow pipe, 15- elastic device, 16- sieve plate, 17- spray water nozzle.

detailed description

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings:

As shown in FIG. 1 , the three-product flotation column suitable for high-ash and fine-grained slime recovery according to the present invention includes an inner layer column and an outer layer column, and the upper opening of the outer layer column is lower than the inner layer column, Both the inner layer cylinder and the outer layer cylinder are nested inside and outside, and the top of the inner layer cylinder is provided with a clean coal collection tank a4 and a feeding pipe, as shown in Figure 4, the inlet of the inner layer cylinder. The counter-current collision mineralization device 1 at the top of the material pipe includes a casing, and a plurality of nozzles for ore slurry nozzles arranged opposite to each other are arranged in the casing. The top of each slurry nozzle is provided with an air pipeline outlet, and the bottom A slurry outlet is provided to connect with the feeding pipe of the inner column; the number of slurry nozzles of the countercurrent collision mineralization device 1 is 4-6, preferably 5; the countercurrent collision mineralization device 1 connected to the feeding pipe, the The inhaled air is divided into microbubbles and dissolved in the highly turbulent slurry, and high-efficiency mineralization is completed in the process of countercurrent collision. , to further improve the mineralization efficiency; around the top of the outer cylinder is provided with a clean coal collection groove b8, and the clean coal collection groove b8 surrounds the inner cylinder; the feeding pipe enters the inner cylinder vertically from the top of the inner cylinder , the bottom end of the feeding pipe is provided with a stepped jet 9, a baffle 10 is provided in the inner cylinder directly below the stepped jet 9, and the opening on the inner cylinder surrounds the feeding pipe with a plurality of upper The spray water device, the upper spray water device includes a plurality of inner layer top spray water devices 2, the inner layer top spray water device 2 is a ring-shaped spray device, and the bottom of each inner layer top spray water device 2 is vertically spaced There are a plurality of water pipes, as shown in Figure 2, the water pipes are provided with multiple layers of downwardly inclined inclined plates 3 at equal intervals, and the inclination angle of the inclined plates 3 is 30-60°, preferably 45°; the inclined plates 3 The interval is 5-15cm, preferably 10cm; as shown in Figure 3, a plurality of spray water nozzles 17 are provided inwardly on the water pipe in the gap of the inclined plate 3, and the inclined plate 3 of the plurality of water pipes constitutes a multi-layer overlapping funnel structure , the bottom of the funnel is provided with an L-shaped coarse-grain recovery channel 5 that communicates with the outside of the inner layer cylinder, the vertical part of the L-shaped channel is provided with an elastic device 15, the bottom of the inner layer column is a funnel structure and is provided with an underflow pipe 14 to communicate with the outside world There is a clean coal collection tank b8 around the opening of the outer layer cylinder, a plurality of outer top spray water devices 7 are arranged above the opening of the outer layer cylinder, and the position below the clean coal collection tank b8 is the inner layer cylinder and the outer layer. There is a foam layer vibration mechanism on the same level of the layer column, and the inclined flow distribution plate 11 of the annular structure is arranged below the outlet of the L-shaped coarse particle recovery channel 5 of the inner layer column in the outer layer column. The inclination angle of the plate 11 is 10-30°, preferably 20°; an annular space is left between the inclined flow distribution plate 11 and the inner layer cylinder, and the annular space constitutes a medium-coal product collection tank 12 that communicates with the outside world, and the outer layer cylinder A water inlet 13 is provided on the outer side below the inclined flow distribution plate 11 . The foam layer vibration mechanism includes a sieve plate 16 arranged on the same level of the inner layer cylinder and the outer layer cylinder, and the sieve plate 16 is connected with an electromagnetic exciter 6; The clean water fed by the nozzle 13 is rich in air bubbles.

a Close the outlet of the bottom flow pipe 14 and the medium coal product collection tank 12, fill the inner cylinder with flotation slurry through the feeding pipe, and at the same time use the water inlet 13 to fill the outer cylinder with clean water rich in bubbles, In the layer column, a stable rising two-phase flow is formed after uniform dispersion by the flow distribution plate 11;

b. The flotation slurry level in the inner cylinder needs to be adjusted at any time to control the thickness of the foam layer and maintain the height of the foam layer to maintain a dynamic balance during the entire slime flotation process; after the foam layer is formed above the inner cylinder, Start the countercurrent collision mineralization device 1 to input the flotation slurry to the stepped jet 9 at the bottom through the feeding pipe, and open the outlet of the bottom flow pipe 14 and the medium coal product collection tank 12 at the same time, and the flotation slurry passes through the stepped jet 9 to accelerate the collision. On the baffle 10, the flotation slurry that hits the baffle 10 bounces and is evenly suspended and distributed in the inner column. The funnel structure at the bottom is finally discharged into tail coal by the bottom flow pipe 14; the coal slime entering the foam layer is suspended upward, and is sprayed by the foam layer vibration mechanism, the multi-layer annular inclined plate 3 and the spray water device 2 at the top of the inner layer. Under the coupling action of water, the fine mud and a small amount of coarse particles in the foam layer are desorbed, and the clean coal foam layer formed after the desorption of fine mud enters the clean coal collection tank 4 through overflow, and finally discharges the refined coal from the clean coal collection tank 4. coal product a;

c The fine mud and some coarse particles falling on the inclined plate 3 quickly slide into the coarse particle recovery channel 5 along the inclined plate 3 under the action of the spray water of the spray water nozzle 17, thereby reducing the dynamic circulation of fine mud and purifying the inner layer The flotation environment of the column;

d The fine mud and coarse particles discharged from the coarse particle recovery channel 5 enter the outer column, and part of the fine mud and coarse coal particles under the action of the rising two-phase flow rise into the foam layer. Under the dual action of the spray water of the spray water device 7 at the top of the layer, the effective separation of the fine mud and the foam carrying the coarse coal particles is realized, wherein the foam carrying the coarse coal particles is discharged through the clean coal collection tank b8 to obtain the clean coal product b, and the fine mud is The action of gravity falls on the inclined flow distribution plate 11 and slides down into the medium coal product collection tank 12 to be discharged as medium coal product.

The coarse particle recovery channel 5 increases the elastic limit of the coarse particle recovery channel 5 itself through the wave-shaped expansion joint arranged in the middle, and reduces the damage to the coarse particle recovery channel 5 caused by the vibration generated by the vibration mechanism of the foam layer.

Example:

A three-product flotation column slime flotation steps suitable for high-ash fine-grained slime recovery are as follows:

Before entering the slurry to start slime flotation, close the bottom flow pipe 14, fill the inner column with slurry, and fill the outer column with clean water, so that the slurry in the flotation column flows as indicated by the arrow in the figure.

1. The coal slime entering the foam layer is washed by the spray water 2, the vibration of the sieve plate 16 driven by the electromagnetic exciter 6, and the coupling of the multi-layer annular inclined plate 3 to effectively strengthen the desorption of fine mud in the foam layer. The clean coal foam layer after desorption of fine mud enters the clean coal collection tank 4 under the action of overflow, and finally becomes clean coal product a.

2. The fine mud and part of the coarse particles falling on the inclined plate 3 quickly slide into the coarse particle recovery channel 5 along the inclined plate 3 driven by the spray water 17, thereby reducing the dynamic circulation of the fine mud and purifying the flotation environment. An elastic device 15 is provided in the middle of the coarse particle recovery channel 5 to increase the elastic limit of the channel and reduce the damage to the channel caused by vibration.

3. After the flotation column runs stably, the flotation slime is fed into the countercurrent collision mineralization device 1 along the feeding pipe. The mineralized material falls evenly into the second-stage stepped jet 9 along the feeding pipe by its own weight, and is evenly suspended and distributed in the cylinder after passing through the baffle 10 .

4. Adjust the slurry level in the flotation column, form a certain depth of foam layer in the foam area, and maintain the height of the foam layer to maintain dynamic balance during the entire slime flotation process. The slime that does not enter the foam layer falls into the bottom of the column under the action of gravity, and is finally discharged from the underflow pipe 14 as tail coal.

5. The coal slime entering the foam layer is washed by the spray water 2, the vibration of the sieve plate 16 driven by the electromagnetic exciter 6, and the coupling of the multi-layer annular inclined plate 3 to effectively strengthen the desorption of fine mud in the foam layer. The clean coal foam layer after desorption of fine mud enters the clean coal collection tank 4 under the action of overflow, and finally becomes clean coal product a.

6. The fine mud and some coarse particles falling on the inclined plate 3 are quickly sent into the coarse particle recovery channel 5 along the inclined plate 3 under the driving of the spray water 17 . An elastic device 15 is provided in the middle of the coarse particle recovery channel 5 .

7. The fine mud and part of the coarse particles enter the outer cylinder through the coarse particle recovery channel 5. After passing through the bubble generator, the gas-liquid two-phase flow rich in bubbles enters through the water inlet 13 at a specific flow rate and is uniformly dispersed by the flow distribution plate 11 to form a stable rising two-phase flow. The effective separation of fine mud and coarse coal particles is achieved under the dual action of the rising two-phase flow and the top spray water 7 of the outer layer.

The coarse particles separated by the outer cylinder enter into the clean coal collection tank 8 under the action of upward flow, and become clean coal product b. The fine mud falls on the inclined flow distribution plate 11 under the action of gravity, slides down into the medium-coal product collection tank 12, and becomes the medium-coal product.

Claims

A three-product flotation column suitable for high-ash and fine-grained slime recovery is characterized in that: it includes an inner layer column and an outer layer column, the upper opening of the outer layer column is lower than the inner layer column, and the inner layer column is lower than the inner layer column. The layer cylinder and the outer layer cylinder are nested inside and outside. The top of the inner layer cylinder is provided with a clean coal collection groove a (4) and a feeding pipe, and the top of the outer layer cylinder is provided with a clean coal collection groove b. (8), the clean coal collection tank b(8) surrounds the inner cylinder; the feeding pipe vertically enters the inner cylinder from the top of the inner cylinder, and the bottom end of the feeding pipe is provided with a stepped jet ( 9), a baffle plate (10) is arranged in the inner cylinder directly below the stepped jet (9), and a plurality of upper spraying water devices are arranged around the feeding pipe at the opening of the inner cylinder, and the upper spraying The water device includes a plurality of inner-layer top spray water devices (2), the inner-layer top spray water device (2) is an annular spray device, and each inner-layer top spray water device (2) is vertically spaced below the water device. A plurality of water pipes, the water pipes are provided with multiple layers of downwardly inclined inclined plates (3) at equal intervals, and a plurality of water spray nozzles (17) are arranged inwardly on the water pipes in the gaps of the inclined plates (3). The inclined plate (3) constitutes a multi-layer overlapping funnel structure, the bottom of the funnel is provided with an L-shaped coarse-grain recovery channel (5) that communicates with the inner cylinder, and the vertical part of the L-shaped channel is provided with an elastic device (15). The bottom of the layer column has a funnel structure and is provided with an underflow pipe (14) to communicate with the outside world; a clean coal collection groove b (8) is arranged around the opening of the outer layer column, and a plurality of outer layers are arranged above the upper opening of the outer layer column. The top spray water device (7), the position below the clean coal collection tank b (8) is provided with a foam layer vibration mechanism on the same level of the inner layer cylinder and the outer layer cylinder, and the outer layer cylinder is located at the L of the inner layer cylinder. An annular structure of inclined flow distribution plate (11) is arranged below the outlet of the coarse-grained recovery channel (5) in the shape of The medium-coal product collection tank (12) is provided with a water inlet (13) on the outer side of the outer layer cylinder at a position below the inclined flow distribution plate (11).
The three-product flotation column suitable for high-ash and fine-grained slime recovery according to claim 1, characterized in that: the foam layer vibration mechanism comprises: The sieve plate (16) is connected with an electromagnetic exciter (6); the water inlet (13) is provided with a bubble generator, so that the clean water fed through the water inlet (13) is rich in air bubbles.
The three-product flotation column suitable for high-ash and fine-grained slime recovery according to claim 1, characterized in that: the elastic device (15) is a corrugated expansion joint.
The three-product flotation column suitable for high-ash and fine-grained slime recovery according to claim 1, characterized in that: the inclination angle of the inclined plate (3) is 30-60°, preferably 45°; The interval between the plates (3) is 5-15 cm, preferably 10 cm; the inclination angle of the inclined flow distribution plate (11) is 10-30°, preferably 20°.
The three-product flotation column suitable for the recovery of high-ash and fine-grained slime according to claim 2, characterized in that: the top of the feeding pipe of the inner column body countercurrently collides with the mineralization device (1), so The countercurrent collision mineralization device (1) includes a casing, and a plurality of nozzles for ore slurry are arranged in the casing. The top of each slurry nozzle is provided with an air pipeline outlet, and the bottom is provided with a slurry outlet and an inner layer cylinder. feed pipe connection.
The three-product flotation column suitable for high-ash and fine-grained slime recovery according to claim 1, characterized in that: the number of slurry nozzles of the countercurrent collision mineralization device (1) is 4-6, 5 are preferred.
The three-product flotation column suitable for the recovery of high-ash and fine-grained slime according to claim 5 is characterized in that: the countercurrent collision mineralization device (1) connected with the feeding pipe divides the inhaled air into microbubbles It is dissolved in the highly turbulent ore slurry and completes high-efficiency mineralization in the process of countercurrent collision. The mineralized ore slurry realizes secondary mineralization through the second-stage stepped jet at the tail of the feeding pipe, which further improves the mineralization efficiency.
A flotation method using a three-product flotation column suitable for high-ash fine-grained slime recovery according to claim 1, characterized in that the steps are as follows:

a Close the outlet of the bottom flow pipe (14) and the medium coal product collection tank (12), fill the inner cylinder with flotation slurry through the feeding pipe, and at the same time use the water inlet (13) to fill the outer cylinder with rich The clean water with bubbles is uniformly dispersed in the outer cylinder by the flow distribution plate (11) to form a stable rising two-phase flow;

b. The flotation slurry level in the inner cylinder needs to be adjusted at any time to control the thickness of the foam layer and maintain the height of the foam layer to maintain a dynamic balance during the entire slime flotation process; after the foam layer is formed above the inner cylinder, Start the countercurrent collision mineralization device (1) to input the flotation slurry to the bottom stepped jet (9) through the feeding pipe, and open the outlet of the bottom flow pipe (14) and the medium coal product collection tank (12) at the same time, and the flotation slurry The stepped jet (9) accelerates and hits the baffle (10), and the flotation slurry that hits the baffle (10) bounces and is evenly suspended and distributed in the inner cylinder. The slime in the foam layer falls into the funnel structure at the bottom of the inner column under the action of gravity, and is finally discharged from the underflow pipe (14) as tail coal; Under the coupling action of the inclined plate (3) and the spray water sprayed by the spray water device (2) at the top of the inner layer, the fine mud and a small amount of coarse particles in the foam layer are desorbed, and the clean coal foam layer is formed after the desorption of the fine mud. Entering the clean coal collection tank (4) under the overflow action, and finally discharge the clean coal product a from the clean coal collection tank (4);

c The fine mud and some coarse particles falling on the inclined plate (3) quickly slide into the coarse particle recovery channel (5) along the inclined plate (3) under the action of the spray water of the spray water nozzle (17), thereby reducing the Dynamic circulation of fine mud to purify the flotation environment of the inner column;

d The fine mud and coarse particles discharged from the coarse particle recovery channel (5) enter the outer cylinder, and part of the fine mud and coarse coal particles under the action of the rising two-phase flow rise into the foam layer, and the rising two-phase flow flows into the foam layer. The effective separation of fine mud and foam carrying coarse coal particles is achieved under the dual action of the spray water of the outer layer top spray water device (7), wherein the foam carrying the coarse coal particles is discharged through the clean coal collection tank b (8) to obtain refined coal. For the coal product b, the fine mud falls on the inclined flow distribution plate (11) under the action of gravity, and slides down into the medium coal product collection tank (12) to be discharged into the medium coal product.
The flotation method according to claim 8, characterized in that: the coarse particle recovery channel (5) increases the elastic limit of the coarse particle recovery channel (5) itself through the wave expansion joint arranged in the middle, and reduces the vibration mechanism of the foam layer The resulting vibration damages the coarse recovery channel (5).
The flotation method according to claim 8, wherein the coal particles in the flotation slurry are high ash fine particles, and the flotation effect of coal particles in the range of -0.074mm is obviously better than that of conventional flotation equipment.