CN112337655B - Three-product flotation column and method suitable for high-ash fine-fraction coal slime - Google Patents
Three-product flotation column and method suitable for high-ash fine-fraction coal slime Download PDFInfo
- Publication number
- CN112337655B CN112337655B CN202011037147.XA CN202011037147A CN112337655B CN 112337655 B CN112337655 B CN 112337655B CN 202011037147 A CN202011037147 A CN 202011037147A CN 112337655 B CN112337655 B CN 112337655B
- Authority
- CN
- China
- Prior art keywords
- layer
- coal
- cylinder
- flotation
- product
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
- B03D1/025—Froth-flotation processes adapted for the flotation of fines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/14—Flotation machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/14—Flotation machines
- B03D1/1412—Flotation machines with baffles, e.g. at the wall for redirecting settling solids
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biotechnology (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
The invention relates to a three-product flotation column and a three-product flotation method suitable for recycling high-ash fine-grained coal slime, and belongs to the technical field of coal recycling. Including inlayer cylinder and outer cylinder, inlayer cylinder top is equipped with clean coal collecting vat an and pan feeding pipe, be equipped with clean coal collecting vat b around the outer cylinder top, the bottom of pan feeding pipe is equipped with the notch cuttype ejector, be equipped with the fender stream board in the inlayer cylinder under the notch cuttype ejector, inlayer cylinder upper shed is equipped with a plurality of top spray water devices around the pan feeding pipe, the bottom is equipped with the coarse grain recovery passageway and the outer intercommunication of inlayer cylinder of L shape, be equipped with clean coal collecting vat b and outer top spray water device around outer cylinder open position, clean coal collecting vat b below position is equipped with foam layer vibrating mechanism on inlayer cylinder and the same level of outer cylinder, be equipped with annular structure's slope stream board in the outer cylinder, leave annular middlings product collecting vat between slope stream board and the inlayer cylinder. The method has the advantages of strong recovery capability, strong coal quality adaptability and high separation precision.
Description
Technical Field
The invention relates to a three-product flotation column and a method, in particular to a three-product flotation column and a method which are suitable for high-ash fine-grained coal slime and are suitable for the technical field of mineral flotation.
Background
The energy structure of China, rich coal, poor oil and little gas, determines that coal becomes an energy pillar of China and occupies a main position in a long period of the future. With the continuous increase of the mechanized coal mining degree, the continuous deepening of mine mining, the continuous deterioration of coal storage geological conditions and the continuous popularization of hydraulic coal mining, a great amount of clay minerals represented by phyllosilicates in a coal seam are mixed into raw coal.
At present, a classification cyclone is commonly used in a coal preparation plant to classify the coal slime with the granularity of 0.25mm, and the coal slime with the granularity of-0.25 mm enters the flotation. Due to the deterioration of coal resources and the continuous improvement of a slime water system, the granularity composition of the floating slime is greatly changed, the content of fine particle grade of-0.074 mm is obviously increased, and the granularity of the slime is micronized. And the fine clay minerals which are easy to argillize easily enter a foam layer through water flow entrainment or a mechanical cover in the flotation process to pollute clean coal products. The coal slime flotation environment is continuously worsened, new challenges are provided for realizing high-precision separation of the coal slime, and the problem that the coal slime is difficult to separate is further highlighted.
The conventional flotation column has a good separation effect on coal slime with the particle size of-0.074 mm, but the separation effect on the coal slime rich in high-ash fine mud is not good because part of the high-ash fine mud is dynamically circulated in the flotation column. Meanwhile, when the problem of pollution of high-ash fine mud to clean coal is solved, the phenomenon of coarse coal leakage can be generated. Thereby reducing the yield of flotation clean coal, reducing the ash content of the tailing coal product and carrying out pathological operation in the flotation process.
Therefore, based on the production status that the content of fine mud in the flotation feed is increased day by day and the problem that the conventional flotation equipment is difficult to continue to efficiently recycle, the novel flotation column has the advantages of strong recycling capability, strong coal quality adaptability and high separation precision, is particularly suitable for separating high-ash fine-grained coal slime, and contains three products of clean coal, middlings and gangue, and needs to be developed urgently.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide a three-product flotation column and a three-product flotation method which are stable in operation, strong in recovery capability, strong in coal quality adaptability and high in separation precision and are suitable for high-ash fine-grained coal slime.
The technical scheme is as follows: the invention relates to a three-product flotation column suitable for recovering high-ash fine-fraction coal slime, which comprises an inner-layer column body and an outer-layer column body, wherein the upper opening of the outer-layer column body is lower than that of the inner-layer column body; the feeding pipe vertically enters the inner-layer cylinder from the top of the inner-layer cylinder, a stepped ejector is arranged at the bottom end of the feeding pipe, a flow baffle plate is arranged in the inner-layer cylinder under the stepped ejector, a plurality of upper spray water devices are arranged at the upper opening of the inner-layer cylinder around the feeding pipe and comprise a plurality of inner-layer top spray water devices, the inner-layer top spray water devices are annular spray water devices, a plurality of water pipes are vertically arranged below each inner-layer top spray water device at intervals, a plurality of inclined plates which are inclined downwards are equidistantly arranged on the water pipes, a plurality of spray water nozzles are inwards arranged on the water pipes in gaps of the inclined plates, the inclined plates of the plurality of water pipes form a multilayer overlapped funnel structure, an L-shaped coarse grain recovery channel is arranged at the bottom of the funnel and is communicated with the outside of the inner-layer cylinder, an elastic device is arranged on the vertical part of the L-shaped channel, and a bottom flow pipe is arranged at the bottom of the inner-layer cylinder and communicated with the outside; be equipped with clean coal collecting vat b around outer cylinder open position, outer cylinder upper shed top is equipped with a plurality of outer top spray water installation, clean coal collecting vat b below position is equipped with foam layer vibration mechanism on inlayer cylinder and the same level of outer cylinder, the coarse grain recovery passageway export below that lies in the L shape of inlayer cylinder is equipped with annular structure's slope cloth and flows board in outer cylinder, leave annular space between slope cloth and the inlayer cylinder, the annular space constitutes the middlings product collecting vat of linking up with the external world, the outer cylinder outside is located slope cloth and flows the board below position and is equipped with the water inlet.
The foam layer vibration mechanism comprises a sieve plate which is arranged on the same level of the inner-layer cylinder and the outer-layer cylinder, and the sieve plate is connected with an electromagnetic vibration exciter; the water inlet is provided with a bubble generator, so that the clear water fed through the water inlet is rich in bubbles.
The elastic device is a wave-shaped expansion joint.
The inclination angle of the inclined plate is 30-60 degrees, preferably 45 degrees; the spacing of the inclined plates is 5-15cm, preferably 10 cm; the inclined angle of the inclined flow distribution plate is 10-30 degrees, and preferably 20 degrees.
The top of the feeding pipe of the inner-layer cylinder is provided with a countercurrent collision mineralization device, the countercurrent collision mineralization device comprises a shell, a plurality of ore pulp nozzles with opposite spray heads are arranged in the shell, the top of each ore pulp nozzle is provided with an air pipeline outlet, and the bottom of each ore pulp nozzle is provided with an ore pulp outlet connected with the feeding pipe of the inner-layer cylinder.
The number of the ore pulp nozzles of the countercurrent collision mineralization device is 4-6, preferably 5.
The feeding pipe is connected with the countercurrent collision mineralization device, inhaled air is divided into micro bubbles to be dissolved in high-turbulence ore pulp, efficient mineralization is completed in the countercurrent collision process, and secondary mineralization of the mineralized ore pulp is realized through the two-section stepped jet device at the tail of the feeding pipe, so that the mineralization efficiency is further improved.
A flotation method of a three-product flotation column suitable for recovering high-ash fine-fraction coal slime comprises the following steps:
a, closing an outlet of a bottom flow pipe and an outlet of a middling product collecting tank, filling flotation pulp into an inner column body through a feeding pipe, filling clear water rich in bubbles into an outer column body through a water inlet, and uniformly dispersing the clear water in the outer column body through a flow distribution plate to form a stable rising two-phase flow;
b, adjusting the flotation slurry surface in the inner-layer cylinder at any time to control the thickness of the foam layer and keep the height of the foam layer in dynamic balance in the whole coal slime flotation process; after a foam layer is formed above the inner-layer cylinder, a countercurrent collision mineralization device is started to input flotation pulp to a stepped jet device at the bottom through a feeding pipe, an outlet of a bottom flow pipe and an outlet of a middling product collecting tank are opened simultaneously, the flotation pulp is accelerated to collide with a flow baffle through the stepped jet device, the flotation pulp colliding with the flow baffle rebounds and is evenly distributed in the inner-layer cylinder in a suspended mode, part of coal slime enters the foam layer, the coal slime which does not enter the foam layer falls into a funnel structure at the bottom of the inner-layer cylinder under the action of gravity, and finally the coal slime is discharged by the bottom flow pipe to form tailing coal; coal slime entering the foam layer is suspended upwards, fine mud and a small amount of coarse particles in the foam layer are desorbed under the coupling action of a foam layer vibration mechanism, a plurality of layers of annular inclined plates and spray water sprayed by a spray water device at the top of the inner layer, a clean coal foam layer formed after the fine mud is desorbed enters a clean coal collecting tank under the overflow action, and finally a clean coal product a is discharged from the clean coal collecting tank;
c, the fine mud and part of coarse particles falling on the inclined plate rapidly slide into the coarse particle recovery channel along the inclined plate under the washing action of the spraying water nozzle, so that the dynamic circulation of the fine mud is reduced, and the flotation environment of the inner-layer cylinder is purified;
d, fine mud and coarse particles discharged from the coarse particle recovery channel enter the outer-layer cylinder, part of the fine mud and coarse coal particles rise to enter the foam layer under the action of the rising two-phase flow, effective separation of the fine mud and the foam carrying the coarse coal particles is realized under the dual action of the rising two-phase flow and spray water of the spray water device at the top of the outer layer, the foam carrying the coarse coal particles is discharged through a fine coal collecting tank b to obtain a fine coal product b, the fine mud falls on an inclined flow distribution plate under the action of gravity, and slides down to enter a middling coal product collecting tank to be discharged into a middling coal product.
The coarse grain recovery passageway improves the elasticity limit of coarse grain recovery passageway self through the wave form expansion joint that the middle part set up, reduces the harm of the vibration that the foam blanket vibrations mechanism produced to coarse grain recovery passageway.
The coal particles in the flotation pulp are high-ash fine particles, and the flotation effect of the flotation pulp on the coal particles within the range of-0.074 mm is obviously better than that of conventional flotation equipment.
Has the advantages that:
the inner and outer double-layer cylinders are nested inside and outside, and the step-by-step flotation of the coal slime is achieved. The low-density clean coal product and the high-density gangue minerals are pre-separated in the inner-layer column body, and the quality of clean coal is improved. The separated fine mud and part of coarse particles enter an outer-layer cylinder through an L-shaped channel to independently recover the coarse particles, so that the loss of the middling coal in tailings is avoided, the pollution of the fine mud to clean coal is avoided, and the resource benefit is maximized; the efficient mineralization of bubbles is completed through a countercurrent collision mineralization device, secondary mineralization of mineralized ore pulp is realized through a trapezoidal jet device, and a flow baffle is utilized, so that on one hand, ascending turning flow can be provided, particles are guaranteed to be uniformly suspended in an inner-layer cylinder, and a good flotation environment is provided; on the other hand, the ore pulp can be prevented from being directly discharged from a tailing port without being floated, namely the ore pulp is prevented from being short-circuited, and the waste is reduced; the inclined plate arranged in the inner-layer cylinder is matched with the spray header at the top of the inner cylinder, so that secondary enrichment of the clean coal product is realized, and the quality of the clean coal product is improved; the vibration mechanism is utilized to reduce the fine mud covered on the surface of the coal particles and strengthen the desorption of the fine mud on the surface of the bubbles. And sending the desorbed fine mud and part of coarse particles into the outer-layer cylinder through the L-shaped coarse particle recovery channel, and recovering the lost coarse particles in the outer-layer cylinder. The waveform expansion joint is utilized to improve the elastic limit of the coarse particle recovery channel, reduce the damage of vibration generated by the foam layer vibration mechanism to the coarse particle recovery channel, prolong the service life and ensure the stable performance of equipment; the flow distribution plate is used for buffering, and meanwhile, coarse-particle coal slime in the ore pulp is prevented from directly entering a middling collecting tank without being sorted due to the inertia effect; the flow distribution plate uniformly disperses the gas-liquid two-phase flow formed by the outer-layer bubble generator to form a stable ascending two-phase flow, and a stable flotation fluid separation environment is provided.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a three-product flotation column suitable for recovering high-ash fine-fraction coal slime.
Fig. 2 is a view a-a of a three product flotation column of the present invention suitable for high ash fine fraction coal slurry recovery.
Fig. 3 is a partially enlarged view of the inclined plate and the shower head of the present invention.
FIG. 4 is a top view of the counter-current collisional mineralization device of the present invention.
In the figure: 1-countercurrent collision mineralization device, 2-inner layer top spray water device, 3-inclined plate, 4-clean coal collecting tank a, 5-coarse grain recovery channel, 6-electromagnetic vibration exciter, 7-outer layer top spray water device, 8-clean coal collecting tank b, 9-step ejector, 10-baffle plate, 11-inclined distribution plate, 12-medium coal product collecting tank, 13-water inlet, 14-bottom flow pipe, 15-elastic device, 16-sieve plate and 17-spray water nozzle.
Detailed Description
Embodiments of the invention are further described below with reference to the accompanying drawings:
as shown in fig. 1, the flotation column for the three-product suitable for recovering high-ash fine-fraction coal slime comprises an inner-layer column body and an outer-layer column body, wherein an upper opening of the outer-layer column body is lower than that of the inner-layer column body, the inner-layer column body and the outer-layer column body are arranged in an inner-outer nested manner, a clean coal collecting tank a4 and a feeding pipe are arranged at the top of the inner-layer column body, as shown in fig. 4, the top of the feeding pipe of the inner-layer column body is in countercurrent collision with a mineralization device 1, the countercurrent collision mineralization device 1 comprises a shell, a plurality of ore pulp nozzles with oppositely arranged spray heads are arranged in the shell, an air pipeline outlet is arranged at the top of each ore pulp nozzle, and an ore pulp outlet arranged at the bottom of each ore pulp nozzle is connected with the feeding pipe of the inner-layer column body; the number of ore pulp nozzles of the countercurrent collision mineralization device 1 is 4-6, preferably 5; the reverse-flow collision mineralization device 1 connected with the feeding pipe divides sucked air into micro bubbles to be dissolved in high-turbulence ore pulp, high-efficiency mineralization is completed in the process of reverse-flow collision, and secondary mineralization of the mineralized ore pulp is realized through a two-section stepped jet device at the tail part of the feeding pipe, so that the mineralization efficiency is further improved; a clean coal collecting groove b8 is arranged around the top of the outer layer column body, and a clean coal collecting groove b8 surrounds the inner layer column body; the feeding pipe vertically enters the inner-layer cylinder from the top of the inner-layer cylinder, a stepped ejector 9 is arranged at the bottom end of the feeding pipe, a flow baffle plate 10 is arranged in the inner-layer cylinder under the stepped ejector 9, a plurality of upper spray water devices are arranged at the upper opening of the inner-layer cylinder around the feeding pipe and comprise a plurality of inner-layer top spray water devices 2, each inner-layer top spray water device 2 is an annular spray device, a plurality of water pipes are vertically arranged below each inner-layer top spray water device 2 at intervals, as shown in figure 2, a plurality of layers of inclined plates 3 which are inclined downwards are arranged on the water pipes at equal intervals, and the inclination angle of each inclined plate 3 is 30-60 degrees, preferably 45 degrees; the interval of the inclined plates 3 is 5-15cm, preferably 10 cm; as shown in fig. 3, a plurality of spray water nozzles 17 are inwardly arranged on the water pipes in the gaps of the inclined plates 3, the inclined plates 3 of the plurality of water pipes form a multi-layer overlapped funnel structure, an L-shaped coarse grain recovery channel 5 is arranged at the bottom of the funnel and is communicated with the outside of the inner-layer cylinder, an elastic device 15 is arranged on the vertical part of the L-shaped channel, the bottom of the inner-layer cylinder is of a funnel structure and is provided with a bottom flow pipe 14 communicated with the outside; a clean coal collecting tank b8 is arranged around the opening position of the outer column body, a plurality of outer top spray water devices 7 are arranged above the upper opening of the outer column body, a foam layer vibration mechanism is arranged below the clean coal collecting tank b8 and on the same level of the inner column body and the outer column body, an inclined flow distribution plate 11 with an annular structure is arranged below the outlet of the L-shaped coarse grain recovery channel 5 of the inner column body in the outer column body, and the inclination angle of the inclined flow distribution plate 11 is 10-30 degrees, preferably 20 degrees; an annular space is reserved between the inclined flow distribution plate 11 and the inner-layer column body, the annular space forms a medium coal product collecting tank 12 communicated with the outside, and a water inlet 13 is formed in the outer side of the outer-layer column body and located below the inclined flow distribution plate 11. The foam layer vibration mechanism comprises a sieve plate 16 which is 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 vibration exciter 6; the water inlet 13 is provided with a bubble generator, so that the clear water fed through the water inlet 13 is rich in bubbles.
A flotation method of a three-product flotation column suitable for recovering high-ash fine-fraction coal slime comprises the following steps:
a, closing an outlet of a bottom flow pipe 14 and a middling product collecting tank 12, filling flotation pulp into an inner column body through a feeding pipe, filling clear water rich in bubbles into an outer column body through a water inlet 13, and uniformly dispersing the clear water in the outer column body through a flow distribution plate 11 to form a stable rising two-phase flow;
b, adjusting the flotation slurry surface in the inner-layer cylinder at any time to control the thickness of the foam layer and keep the height of the foam layer in dynamic balance in the whole coal slime flotation process; after a foam layer is formed above the inner-layer cylinder, the countercurrent collision mineralization device 1 is started to input flotation pulp to the stepped jet device 9 at the bottom through the feeding pipe, meanwhile, the outlet of the underflow pipe 14 and the middling product collecting tank 12 is opened, the flotation pulp is accelerated to collide with the flow baffle 10 through the stepped jet device 9, the flotation pulp colliding with the flow baffle 10 rebounds and is evenly distributed in the inner-layer cylinder in a suspension manner, part of coal slime enters the foam layer, the coal slime which does not enter the foam layer falls into a funnel structure at the bottom of the inner-layer cylinder under the action of gravity, and finally the flotation pulp is discharged by the underflow pipe 14 to form tailings; coal slime entering the foam layer is suspended upwards, fine mud and a small amount of coarse particles in the foam layer are desorbed under the coupling action of a foam layer vibration mechanism, the multilayer annular inclined plate 3 and spray water sprayed by the spray water device 2 at the top of the inner layer, a clean coal foam layer formed after the fine mud is desorbed enters a clean coal collecting tank 4 under the overflow action, and finally a clean coal product a is discharged from the clean coal collecting tank 4;
c, fine mud and part of coarse particles falling on the inclined plate 3 rapidly slide into the coarse particle recovery channel 5 along the inclined plate 3 under the washing action of the spray water nozzle 17, so that the dynamic circulation of the fine mud is reduced, and the flotation environment of the inner-layer cylinder is purified;
d, fine mud and coarse particles discharged from the coarse particle recovery channel 5 enter an outer layer column body, part of the fine mud and the coarse particles rise to enter a foam layer under the action of the rising two-phase flow, effective separation of the fine mud and the foams carrying the coarse particles is realized under the double action of the rising two-phase flow and spray water of the spray water device 7 at the top of the outer layer, wherein the foams carrying the coarse particles are discharged through a fine coal collecting tank b8 to obtain a fine coal product b, the fine mud falls on the inclined flow distribution plate 11 under the action of gravity, and the fine mud slides into a middling coal product collecting tank 12 to be discharged into a middling coal product.
Coarse grain recovery channel 5 improves the elasticity limit of coarse grain recovery channel 5 self through the wave form expansion joint that the middle part set up, reduces the harm of the vibration that the foam blanket vibrations mechanism produced to coarse grain recovery channel 5.
The coal particles in the flotation pulp are high-ash fine particles, and the flotation effect of the flotation pulp on the coal particles within the range of-0.074 mm is obviously better than that of conventional flotation equipment.
Example (b):
a flotation method of coal slime with a three-product flotation column, which is suitable for recycling high-ash fine-fraction coal slime, comprises the following steps:
before slurry is introduced to start coal slime flotation, the underflow pipe 14 is closed, the inner column body is filled with slurry, and the outer column body is filled with clear water, so that the slurry in the flotation column flows according to arrows in the figure.
1. The coal slime entering the foam layer is effectively strengthened in the desorption of the fine mud in the foam layer under the coupling action of the spraying water washing, the vibration of the sieve plate 16 driven by the electromagnetic vibration exciter 6 and the multilayer annular inclined plate 3. The clean coal foam layer after the fine mud desorption enters a clean coal collecting tank 4 under the overflow action, and finally becomes a clean coal product a.
2. The fine mud and part of coarse particles falling on the inclined plate 3 slide into the coarse particle recovery channel 5 along the inclined plate 3 under the driving of spray water, so that the dynamic circulation of the fine mud is reduced, and the flotation environment is purified. The middle part of the coarse grain recycling channel 5 is provided with an elastic device 15 so as to improve the elastic limit of the channel and reduce the damage of vibration to the channel.
3. After the operation in the flotation column is stable, feeding the flotation coal slime into the section of countercurrent collision mineralization device 1 along the feeding pipe. The mineralized materials evenly fall into the two-section stepped jet device 9 along the feeding pipe by means of self weight, and are evenly suspended and distributed in the column body after passing through the flow baffle plate 10.
4. And adjusting the liquid level of the ore pulp in the flotation column, forming a foam layer with a certain depth in a foam zone, and keeping the height of the foam layer to maintain dynamic balance in the whole coal slime flotation process. The coal slurry which does not enter the foam layer falls into the bottom of the column under the action of gravity and is finally discharged by the underflow pipe 14 to become tailing.
5. The coal slime entering the foam layer is effectively strengthened in the desorption of the fine mud in the foam layer under the coupling action of the spraying water washing, the vibration of the sieve plate 16 driven by the electromagnetic vibration exciter 6 and the multilayer annular inclined plate 3. The clean coal foam layer after the fine mud desorption enters a clean coal collecting tank 4 under the overflow action, and finally becomes a clean coal product a.
6. The fine mud and part of coarse particles falling on the inclined plate 3 are driven by the spray water to be rapidly sent into the coarse particle recovery channel 5 along the inclined plate 3. The middle part of the coarse grain recycling channel 5 is provided with an elastic device 15.
7. The fine mud and part of the coarse particles enter the outer cylinder from the coarse recovery channel 5. The gas-liquid two-phase flow rich in bubbles after passing through the bubble generator 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 ascending two-phase flow. The fine mud and the coarse coal particles are effectively separated under the double actions of the ascending two-phase flow and the outer layer top spray water.
The coarse particles separated by the outer column body enter a clean coal collecting tank 8 under the action of the ascending flow to become a clean coal product b. The fine mud falls on the inclined flow distribution plate 11 under the action of gravity and falls into a middling product collecting tank 12 to become a middling product.
Claims (10)
1. A three-product flotation column suitable for recycling high-ash fine-fraction coal slime is characterized in that: the clean coal collecting device comprises an inner layer column body and an outer layer column body, wherein the upper opening of the outer layer column body is lower than that of the inner layer column body, the inner layer column body and the outer layer column body are nested inside and outside, a clean coal collecting groove a (4) and a feeding pipe are arranged at the top of the inner layer column body, a clean coal collecting groove b (8) is arranged around the top of the outer layer column body, and the clean coal collecting groove b (8) surrounds the inner layer column body; the feeding pipe vertically enters the inner-layer cylinder from the top of the inner-layer cylinder, a stepped ejector (9) is arranged at the bottom end of the feeding pipe, a flow baffle plate (10) is arranged in the inner-layer cylinder under the stepped ejector (9), a plurality of upper spraying devices are arranged at the upper opening of the inner-layer cylinder around the feeding pipe, each upper spraying device comprises a plurality of inner-layer top spraying devices (2), each inner-layer top spraying device (2) is an annular spraying device, a plurality of water pipes are vertically arranged below each inner-layer top spraying device (2) at intervals, inclined plates (3) which are inclined downwards in a multi-layer mode are arranged on the water pipes at equal intervals, a plurality of spraying heads (17) are inwards arranged on the water pipes in gaps of the inclined plates (3), the inclined plates (3) of the plurality of water pipes form a multi-layer overlapped funnel structure, an L-shaped coarse grain recovery channel (5) is arranged at the bottom of the funnel and is communicated with the outer-layer cylinder, an elastic device (15) is arranged on the vertical part of the L-shaped channel, the bottom of the inner layer cylinder is of a funnel structure and is provided with an underflow pipe (14) to communicate with the outside; be equipped with clean coal collecting vat b (8) around the outer cylinder open position, outer cylinder upper shed top is equipped with a plurality of outer top spray water installation (7), clean coal collecting vat b (8) below position is equipped with foam layer vibration mechanism on inlayer cylinder and outer cylinder same level, the coarse grain recovery passageway (5) export below that is located the L shape of inlayer cylinder in the outer cylinder is equipped with the slope distribution board (11) of annular structure, leave the annular space between slope distribution board (11) and the inlayer cylinder, the annular space constitutes middlings product collecting vat (12) of linking up with the external world, the outer cylinder outside is located slope distribution board (11) below position and is equipped with water inlet (13).
2. The three-product flotation column suitable for high-ash fine-fraction coal slurry recovery of claim 1, wherein: the foam layer vibrating mechanism comprises a sieve plate (16) which is 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 vibration exciter (6); the water inlet (13) is provided with a bubble generator, so that the clear water fed through the water inlet (13) is rich in bubbles.
3. The three-product flotation column suitable for high-ash fine-fraction coal slurry recovery of claim 1, wherein: the elastic device (15) is a wave-shaped expansion joint.
4. The three-product flotation column suitable for high-ash fine-fraction coal slurry recovery of claim 1, wherein: the inclination angle of the inclined plate (3) is 30-60 degrees; the interval of the inclined plates (3) is 5-15 cm; the inclination angle of the inclined flow distribution plate (11) is 10-30 degrees.
5. The three-product flotation column suitable for high-ash fine-fraction coal slurry recovery of claim 2, wherein: the device is characterized in that a reverse flow collision mineralization device (1) is arranged at the top of a feeding pipe of the inner-layer cylinder, the reverse flow collision mineralization device (1) comprises a shell, a plurality of ore pulp nozzles with opposite spray heads are arranged in the shell, an air pipeline outlet is arranged at the top of each ore pulp nozzle, and an ore pulp outlet connected with the feeding pipe of the inner-layer cylinder is arranged at the bottom of each ore pulp nozzle.
6. The three-product flotation column suitable for high-ash fine-fraction coal slurry recovery of claim 5, wherein: the number of ore pulp nozzles of the countercurrent collision mineralization device (1) is 4-6.
7. The three-product flotation column suitable for high-ash fine-fraction coal slurry recovery of claim 5, wherein: the feeding pipe is connected with a countercurrent collision mineralization device (1), inhaled air is divided into micro bubbles to be dissolved in high-turbulence ore pulp, efficient mineralization is completed in the countercurrent collision process, and secondary mineralization of the mineralized ore pulp is realized through a two-section stepped jet device at the tail of the feeding pipe, so that the mineralization efficiency is further improved.
8. A flotation process using the three-product flotation column of claim 1 adapted for high ash fine fraction coal slurry recovery, characterized by the steps of:
a, closing an outlet of a bottom flow pipe (14) and a middling product collecting tank (12), filling flotation ore pulp into an inner cylinder through a feeding pipe, filling clear water rich in bubbles into an outer cylinder through a water inlet (13), and uniformly dispersing the clear water in the outer cylinder through a flow distribution plate (11) to form a stable rising two-phase flow;
b, adjusting the flotation slurry surface in the inner-layer cylinder at any time to control the thickness of the foam layer and keep the height of the foam layer in dynamic balance in the whole coal slime flotation process; after a foam layer is formed above the inner-layer cylinder, a countercurrent collision mineralization device (1) is started to input flotation pulp to a stepped ejector (9) at the bottom through a feeding pipe, an underflow pipe (14) and an outlet of a medium coal product collecting tank (12) are opened simultaneously, the flotation pulp is accelerated to collide with a flow baffle (10) through the stepped ejector (9), the flotation pulp colliding with the flow baffle (10) rebounds and is uniformly suspended and distributed in the inner-layer cylinder, part of the coal slime enters the foam layer, the coal slime which does not enter the foam layer falls into a funnel structure at the bottom of the inner-layer cylinder under the action of gravity, and finally the flotation pulp is discharged by the underflow pipe (14) to form tailing; coal slime entering the foam layer is suspended upwards, fine mud and a small amount of coarse particles in the foam layer are desorbed under the coupling action of spray water sprayed by a foam layer vibration mechanism, the multilayer annular inclined plate (3) and the inner layer top spray water device (2), a clean coal foam layer formed after the fine mud is desorbed enters a clean coal collecting tank (4) under the overflow action, and a clean coal product a is finally discharged from the clean coal collecting tank (4);
c, fine mud and part of coarse particles falling on the inclined plate (3) rapidly slide into the coarse particle recovery channel (5) along the inclined plate (3) under the washing action of the spray water nozzle (17), so that the dynamic circulation of the fine mud is reduced, and the flotation environment of the inner-layer cylinder is purified;
d, fine mud and coarse particles discharged from the coarse particle recovery channel (5) enter an outer-layer column body, part of the fine mud and the coarse coal particles rise to enter a foam layer under the action of rising two-phase flow, effective separation of the fine mud and the foams carrying the coarse coal particles is realized under the double action of the rising two-phase flow and spray water of a spray water device (7) at the top of the outer layer, wherein the foams carrying the coarse coal particles are discharged through a fine coal collecting tank b (8) to obtain a fine coal product b, the fine mud falls on an inclined flow distribution plate (11) under the action of gravity, and the fine mud slides into a middling coal product collecting tank (12) to be discharged into a middling coal product.
9. A flotation process according to claim 8, characterized in that: the coarse grain recovery channel (5) improves the elastic limit of the coarse grain recovery channel (5) through a waveform expansion joint arranged in the middle, and reduces the damage of vibration generated by the foam layer vibration mechanism to the coarse grain recovery channel (5).
10. A flotation process according to claim 8, characterized in that: the coal particles in the flotation pulp are high-ash fine particles, and the flotation effect of the flotation pulp on the coal particles within the range of-0.074 mm is obviously better than that of conventional flotation equipment.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011037147.XA CN112337655B (en) | 2020-09-27 | 2020-09-27 | Three-product flotation column and method suitable for high-ash fine-fraction coal slime |
| PCT/CN2020/132023 WO2022062165A1 (en) | 2020-09-27 | 2020-11-27 | Three-product flotation column and method suitable for high-ash fine-grained coal slime |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011037147.XA CN112337655B (en) | 2020-09-27 | 2020-09-27 | Three-product flotation column and method suitable for high-ash fine-fraction coal slime |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112337655A CN112337655A (en) | 2021-02-09 |
| CN112337655B true CN112337655B (en) | 2021-09-10 |
Family
ID=74361062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011037147.XA Active CN112337655B (en) | 2020-09-27 | 2020-09-27 | Three-product flotation column and method suitable for high-ash fine-fraction coal slime |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN112337655B (en) |
| WO (1) | WO2022062165A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113058750B (en) * | 2021-03-30 | 2022-07-29 | 太原睿孚特选煤技术有限公司 | Reverse fluidization bubble bed coal slime flotation machine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2577743A1 (en) * | 2007-02-09 | 2008-08-09 | Syncrude Canada Ltd. | Enhanced bitumen flotation |
| CN101844113A (en) * | 2010-06-08 | 2010-09-29 | 长沙矿冶研究院 | Flotation machine for efficiently recovering fine-particle minerals |
| CN102698879A (en) * | 2012-05-09 | 2012-10-03 | 山东莱芜煤矿机械有限公司 | Flotation column special for floating fine flake graphite |
| CN103480502A (en) * | 2013-09-10 | 2014-01-01 | 中国矿业大学 | Separation equipment with three-product cyclone micro-bubble flotation columns and separation method implemented by separation equipment |
| CN205095964U (en) * | 2015-10-28 | 2016-03-23 | 中国矿业大学 | Static microbubble flotation column of inflatable whirl |
| CN109731696A (en) * | 2019-03-14 | 2019-05-10 | 中国矿业大学 | A kind of static flotation method suitable for coarse granule recycling |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06211B2 (en) * | 1986-11-19 | 1994-01-05 | 三菱重工業株式会社 | Flotation device |
| US4981582A (en) * | 1988-01-27 | 1991-01-01 | Virginia Tech Intellectual Properties, Inc. | Process and apparatus for separating fine particles by microbubble flotation together with a process and apparatus for generation of microbubbles |
| CN104815770B (en) * | 2015-04-26 | 2017-06-16 | 中国矿业大学 | A kind of wholegrain level slime separation equipment |
| CN109759242B (en) * | 2019-01-31 | 2019-11-29 | 中国矿业大学 | A kind of high ash fine slime screening installation and method |
| CN109746125B (en) * | 2019-03-15 | 2019-11-29 | 中国矿业大学 | A kind of high ash fine slime sorting unit and method |
| CN110665646B (en) * | 2019-10-10 | 2020-07-17 | 中国矿业大学 | Three-product cyclone flotation device and flotation method |
-
2020
- 2020-09-27 CN CN202011037147.XA patent/CN112337655B/en active Active
- 2020-11-27 WO PCT/CN2020/132023 patent/WO2022062165A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2577743A1 (en) * | 2007-02-09 | 2008-08-09 | Syncrude Canada Ltd. | Enhanced bitumen flotation |
| CN101844113A (en) * | 2010-06-08 | 2010-09-29 | 长沙矿冶研究院 | Flotation machine for efficiently recovering fine-particle minerals |
| CN102698879A (en) * | 2012-05-09 | 2012-10-03 | 山东莱芜煤矿机械有限公司 | Flotation column special for floating fine flake graphite |
| CN103480502A (en) * | 2013-09-10 | 2014-01-01 | 中国矿业大学 | Separation equipment with three-product cyclone micro-bubble flotation columns and separation method implemented by separation equipment |
| CN205095964U (en) * | 2015-10-28 | 2016-03-23 | 中国矿业大学 | Static microbubble flotation column of inflatable whirl |
| CN109731696A (en) * | 2019-03-14 | 2019-05-10 | 中国矿业大学 | A kind of static flotation method suitable for coarse granule recycling |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022062165A1 (en) | 2022-03-31 |
| CN112337655A (en) | 2021-02-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109731696B (en) | static flotation method suitable for coarse particle recovery | |
| CN108970813B (en) | Fluidized coarse grain flotation equipment and flotation method | |
| CN110201790B (en) | Sorting and recycling system and sorting and recycling process for wide-size coal slime | |
| CN109939839B (en) | Fluid collaborative strengthening flotation separation device and method | |
| CN101773873B (en) | Slime separation method and equipment | |
| CN103480502B (en) | Three-product cyclone microbubble floatation column screening installation and method | |
| CN210207231U (en) | Fluid synergistic enhanced flotation separation device | |
| CN109731698B (en) | High-ash and easily-floating fine-grain coal slime column sorting device and method | |
| CN101507946B (en) | Double tail-removing gravity-flotation combined sorting method and device | |
| CN102225354B (en) | Re-flotation hybrid selecting process and selecting device thereof | |
| CN109746124B (en) | Static flotation column suitable for coarse particle recovery | |
| CN104815770A (en) | Whole-grade slurry separation device | |
| CN104069954A (en) | Flotation column system and method for sorting high-concentration pulp | |
| CN112337655B (en) | Three-product flotation column and method suitable for high-ash fine-fraction coal slime | |
| CN110882851B (en) | Beneficiation system and beneficiation method for sulfide ore | |
| CN111375483A (en) | Separation system and separation process for coal slime recovery | |
| CN110665646B (en) | Three-product cyclone flotation device and flotation method | |
| CN102343309A (en) | Machine-column combined three-section floating equipment | |
| CN104148164A (en) | Method for coal washing by means of carbon dioxide | |
| CN105834011B (en) | Flotation column intensified sorting device and method for separating with filling-material structure | |
| CN111389580B (en) | Three-product hydraulic flotation machine for coarse particle recovery and separation method | |
| CN202270582U (en) | Machine and post combined three-section floatation equipment | |
| CN112588454B (en) | Secondary hydraulic flotation machine and flotation method for sorting coarse mineral particles | |
| CN113578515A (en) | Protective sorting equipment and method for large-scale graphite | |
| CN210411561U (en) | Improved generation tailing metal gathers machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |