CN109046748B - Coal slime sorting device, sorting system and sorting method - Google Patents

Abstract

The coal slime separation device according to the embodiment of the invention comprises: the classifying cyclone, the liquid-solid fluidized bed and the feeding tray, wherein the liquid-solid fluidized bed is provided with a separating cavity, the feeding tray is arranged on the upper part of the liquid-solid fluidized bed and is connected with the liquid-solid fluidized bed, the feeding tray is positioned in the separating cavity, and the feeding tray is provided with a feeding groove communicated with the separating cavity. According to the coal slime sorting device provided by the embodiment of the invention, the classifying cyclone is directly fixed above the liquid-solid fluidized bed through the feeding tray, so that feeding materials (namely coal slime) can directly flow out of the classifying cyclone and flow into the liquid-solid fluidized bed through the feeding tray, a conveying pipeline is prevented from being set up between the classifying cyclone and the liquid-solid fluidized bed, the space occupation of the coal slime sorting device is reduced, the power consumption and the material consumption are saved, and the production cost of coal slime sorting operation is reduced.

Description

Coal slime sorting device, sorting system and sorting method

Technical Field

The invention relates to the technical field of slime separation, in particular to a slime separation device, a slime separation system and a slime separation method.

Background

In the related art, in order to sort the slime, the slime needs to be graded by a grading cyclone (i.e., grading the granularity of the slime), and then the slime is sorted by a liquid-solid fluidized bed (i.e., sorting the density of the slime), so as to obtain the slime meeting the use requirements.

However, the coal slime which is classified in the classifying cyclone is required to be conveyed into the liquid-solid fluidized bed through a conveying pipeline, so that the occupied space is large, the long-distance conveying of the coal slime can also improve the power consumption and the material consumption of the coal slime sorting device, and the processing cost in the coal slime sorting process is increased.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the coal slime sorting device, which is small in space occupation, low in power consumption and low in material consumption.

The coal slime separation device according to the embodiment of the invention comprises: the classifying cyclone, the liquid-solid fluidized bed and the feeding tray, wherein the liquid-solid fluidized bed is provided with a separating cavity, the feeding tray is arranged on the upper part of the liquid-solid fluidized bed and is connected with the liquid-solid fluidized bed, the feeding tray is positioned in the separating cavity, and the feeding tray is provided with a feeding groove communicated with the separating cavity.

According to the coal slime sorting device provided by the embodiment of the invention, the classifying cyclone is directly fixed above the liquid-solid fluidized bed through the feeding tray, so that feeding materials (namely coal slime) can directly flow out of the classifying cyclone and flow into the liquid-solid fluidized bed through the feeding tray, a conveying pipeline is prevented from being set up between the classifying cyclone and the liquid-solid fluidized bed, the space occupation of the coal slime sorting device is reduced, the power consumption and the material consumption are saved, and the production cost of the coal slime sorting specialty is reduced.

According to some embodiments of the invention, the classifying cyclone underflow opening of the classifying cyclone extends into the inlet chute.

Furthermore, an inserting convex part is further arranged in the feeding tray, and the inserting convex part stretches into the bottom flow port of the classifying cyclone to partially block the bottom flow port of the classifying cyclone.

In some embodiments, the liquid-solid fluidized bed further comprises a deceleration baffle extending into the feed trough and spaced apart from a bottom wall of the feed trough, the deceleration baffle being radially located between the classifying cyclone and a sidewall of the feed tray.

Optionally, the liquid-solid fluidized bed includes the lathe bed and covers the lamina tecti on the lathe bed, the speed reduction baffle connect in lamina tecti, the pan feeding tray is located in the separation chamber, lamina tecti with the inside bin outlet is jointly limited between the roof of pan feeding tray, the pan feeding groove with connect through inside bin outlet between the separation chamber.

Further, the extension direction of the inner discharge opening is perpendicular to the axial direction of the sorting chamber.

In some embodiments, the cross section of the sorting chamber is annular, the side wall of the bed comprises an inner side wall and an outer side wall, and the feeding tray is connected to the inner side wall of the sorting device.

Further, the number of the classifying cyclones is multiple, the speed reducing baffle plate is annular, and the classifying cyclones are uniformly distributed on the inner side of the speed reducing baffle plate.

According to some embodiments of the invention, the liquid-solid fluidized bed comprises: the sorting chamber is defined in the lathe bed, the top of the lathe bed is opened to form the flash mouth, the pan feeding tray be in the inner wall inboard of lathe bed with the lathe bed is connected, the lathe bed includes annular inside wall, lateral wall and connect a plurality of toper diapire between inside wall and the lateral wall, a plurality of toper diapire are followed the circumference equipartition of lathe bed, every the bottom of toper diapire has the underflow export.

Further, the liquid-solid fluidized bed further comprises: the water supply pipeline is provided with a plurality of water outlet pipes positioned in the sorting cavity, each water outlet pipe extends along the radial direction of the lathe bed and a plurality of water outlet pipes are uniformly distributed along the circumferential direction of the lathe bed, each water outlet pipe is provided with a plurality of water spray ports which are sequentially distributed along the radial direction of the lathe bed, and the distribution density of the water spray ports on the water outlet pipes is gradually increased from inside to outside.

The slime separation system according to the embodiment of the second aspect of the present invention includes: the device comprises a coal slime storage device, the device for separating coal slime, the device for separating coarse and medium coal slime and the device for floating concentrate, wherein the device for storing coal slime is used for storing coal slime raw materials, a discharge port of the device for storing coal slime is connected with a feed inlet of a classifying cyclone, the classifying cyclone is provided with an overflow pipe, an underflow outlet is arranged at the bottom of a liquid-solid fluidized bed, the device for separating coarse and medium coal slime comprises a high-frequency vibrating screen, a thickener and a first filter press, the high-frequency vibrating screen is suitable for screening coarse and medium coal slime and supplying screened liquid to the thickener, a solid outlet of the thickener is connected with the first filter press, a liquid outlet of the thickener is connected with a liquid outlet of the first filter press, a solid outlet of the first filter press is suitable for discharging tail coal slime, the coarse and medium coal slime screening device comprises a concentrating cyclone and a linear vibrating screen connected with a bottom flow port of the concentrating cyclone, a bottom flow port of the concentrating cyclone is suitable for being connected with the linear vibrating screen, the linear vibrating screen is suitable for screening coarse and medium coal slime, the coarse and medium coal slime is suitable for being screened out, the filter and the filter cyclone is suitable for being connected with a second filter press, a liquid inlet of the filter press is suitable for being connected with a liquid inlet of the second filter press, a liquid inlet of the filter press is suitable for being connected with a second filter press, and a liquid inlet of the ore pulp collector.

The invention also provides a separation method of the slime separation system, which comprises the following steps:

classifying and sorting: separating the coal slime raw material into small-granularity coal slime and large-granularity coal slime through a cyclone separation process, and separating the large-granularity coal slime through a liquid-solid fluidization process to obtain large-density coal slime and small-density coal slime;

sorting coarse and medium slime: high-frequency vibration screening is carried out on the high-density coal slime to obtain coarse medium-density coal slime, and dehydration and filter pressing are carried out on undersize materials to obtain tail coal slime and circulating water;

sorting coarse refined coal slime: concentrating the small-density coal slime, screening the solid obtained after concentration, obtaining coarse and refined coal slime on a screen, and sending undersize and liquid generated in the concentration process to flotation;

and (3) refined coal flotation: and mixing undersize obtained in classification and separation of small-granularity coal slime and coarse refined coal slime with liquid produced in the concentration process, floating and press-filtering to obtain floating refined coal after press-filtering, and refluxing the liquid produced in press-filtering to the mixing process.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a cross-sectional view of a coal slurry sorting apparatus according to an embodiment of the present invention;

FIG. 2 is a top view of a coal slurry sorting apparatus according to an embodiment of the invention;

FIG. 3 is a schematic view of a classification cyclone and a loading tray of a slime separation device according to an embodiment of the present invention;

FIG. 4 is a schematic view of water supply lines of a liquid-solid fluidized bed of a coal slurry sorting apparatus according to an embodiment of the present invention;

FIG. 5 is a schematic view of a bed of a liquid-solid fluidized bed of a coal slurry sorting apparatus according to an embodiment of the present invention;

FIG. 6 is an enlarged schematic view of area A of FIG. 5;

FIG. 7 is a schematic view of a tapered bottom wall of a bed of a coal slurry sorting apparatus according to an embodiment of the invention;

fig. 8 is a device connection diagram of a coal slurry sorting system according to an embodiment of the invention.

Reference numerals:

the coal slime sorting device 100, a classifying cyclone 110, a liquid-solid fluidized bed 120, a feeding tray 130, a decelerating barrier 140, a plug-in convex part 150, an overflow pipe 111, a classifying cyclone underflow port 112, a classifying cyclone feeding port 113, a bed 121, an overflow tank 1211, a conical bottom wall 1212, a controller 122, a pressure sensor 123, an actuator 124, a compression bar 1241, a water supply pipe 125, a water outlet pipe 1251, a water spray port 12511, a top cover plate 126, a sorting chamber 127, an underflow outlet 128, an inlet chute 131,

the coal slurry storage device 200,

coarse and medium slime screening device 300, high frequency vibrating screen 310, thickener 320, first filter press 330,

coarse and fine coal slime screening device 400, concentrating cyclone 410, linear vibrating screen 420,

a clean coal flotation device 500, a slurry preparation device 510, a flotation column 520, a second filter press 530,

the slurry pump 600 is configured to pump the slurry,

coarse medium coal slime a, coarse refined coal slime b, tail coal slime c, flotation refined coal d and circulating water e.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

A slime separation device 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 8.

As shown in fig. 1, 2 and 3, a slime separation device 100 according to an embodiment of the present invention includes: the classifying cyclone 110, the liquid-solid fluidized bed 120 and the feeding tray 130, wherein the liquid-solid fluidized bed 120 is provided with a classifying cavity, the feeding tray 130 is connected with the liquid-solid fluidized bed 120 at the upper part of the liquid-solid fluidized bed 120, the feeding tray 130 is positioned in the classifying cavity 127, and a feeding groove 131 communicated with the classifying cavity 127 is defined in the feeding tray 130.

According to the coal slime separation device 100 of the embodiment of the invention, the classification cyclone 110 is directly fixed above the liquid-solid fluidized bed 120 through the feeding tray 130, so that feeding materials (namely coal slime) can directly flow out of the classification cyclone 110 and flow into the liquid-solid fluidized bed 120 through the feeding tray 130, so that a conveying pipeline is prevented from being set up between the classification cyclone 110 and the liquid-solid fluidized bed 120, the space occupation of the coal slime separation device 100 is reduced, the power consumption and the material consumption are saved, and the production cost of coal slime separation operation is reduced.

The following describes in detail the working principle of the slime separation device 100 according to the embodiment of the present invention: the slime separation device 100 includes a classifying cyclone 110, a feeding tray 130, and a liquid-solid fluidized bed 120. The coal slime is transferred to the classifying cyclone 110 through the slurry pump 600, and centrifugal sedimentation of the coal slime is achieved in the classifying cyclone 110, so that small-particle-size coal slime overflows above the classifying cyclone 110 and large-particle-size coal slime flows out below the classifying cyclone 110, whereby the large-particle-size coal slime flowing out below the classifying cyclone 110 is accommodated in the feed tray 130, flows into the liquid-solid fluidized bed 120 from the feed tray 130, and is separated into small-density coal slime and large-density coal slime in the liquid-solid fluidized bed 120.

In the process of sorting the slime, the granularity of the slime (i.e., the particle size of the slime particles) and the density of the slime have a great influence on the sorting of the slime. Therefore, the invention classifies the particle size of the coal slime through the classification cyclone 110 to classify the coal slime into two parts of large-particle-size coal slime and small-particle-size coal slime, further classifies the large-particle-size coal slime into two parts of small-density coal slime and large-density coal slime through the liquid-solid fluidized bed 120, so that the particle size range of the large-particle-size coal slime in the liquid-solid fluidized bed 120 is more concentrated, the interference of particle size on the sedimentation effect of the coal slime is reduced, and the layered sedimentation effect of the coal slime in the liquid-solid fluidized bed 120 is better.

In the particular embodiment shown in fig. 3, the classifying cyclone underflow port 112 extends into the chute 131. Thus, during the operation of the slime separation device 100, a liquid level higher than the bottom flow port 112 of the classifying cyclone may be formed in the feeding groove 131, so as to prevent air from entering the classifying cyclone 110 to form an air column, thereby improving the classifying effect of the classifying cyclone 110 on the slime.

It should be noted that, the classifying cyclone 110 generates a vortex by rotating to classify the coal slurry under the action of centrifugal force, and during classification, the pressure near the central axis of the classifying cyclone 110 is lower than the external atmospheric pressure, and the external air enters the classifying cyclone 110 through the classifying cyclone underflow port 112 and forms an air column, which reduces the classifying effect of the classifying cyclone 110.

As shown in fig. 1 and 3, a plug protrusion 150 is further disposed in the feeding tray 130, and the plug protrusion 150 extends into the classifying cyclone underflow port 112 through the classifying cyclone underflow port 112 to partially block the classifying cyclone underflow port 112. Specifically, a plurality of insertion protrusions 150 are disposed on the circumference of the feeding tray 130, and the insertion protrusions 150 pass through the cyclone underflow opening 112 to extend into the cyclone 110. Therefore, through the arrangement of the plugging convex portion 150, not only the formation of the air column can be further prevented, but also the large-granularity coal slime in the feeding tray 130 can be prevented from flowing back into the classifying cyclone 110 under the action of the pressure difference between the classifying cyclone 110 and the outside, so that the occurrence of the suck-back phenomenon is effectively avoided, and the working stability of the classifying cyclone 110 is improved.

In the particular embodiment shown in fig. 1, 2, and 3, the liquid-solid fluidized bed 120 further includes a deceleration baffle 150, the deceleration baffle 150 extending into the trough 131 and being spaced apart from the bottom wall of the trough 131, the deceleration baffle 150 being radially positioned between the classifying cyclone 110 and the sidewall of the loading tray 130.

Specifically, the deceleration baffle 150 is disposed above the inlet chute 131, and a space defined between the deceleration baffle 150 and the bottom wall of the inlet chute 131 and a region where the deceleration baffle 150 and the classifying cyclone 110 are located are formed as two layers of the inlet chute 131 separated by the deceleration baffle 150, and the two layers are communicated. Thus, not only the large-particle size coal slurry flowing out of the bottom flow port 112 of the classifying cyclone can be contained and buffered by the feeding tray 130, but also the large-particle size coal slurry can be primarily flow-rate reduced by the reduction baffle 150 and further flow-rate reduced by the outer wall of the feeding trough 131, so that the flow rate of the large-particle size coal slurry flowing into the liquid-solid fluidized bed 120 through the feeding tray 130 is lower and the large-particle size coal slurry horizontally flows into the liquid-solid fluidized bed 120, so that the impact of the large-particle size coal slurry on the liquid-solid fluidized bed 120 is reduced.

Here, it can be understood that the existing feeding manner of adding the large-particle-size coal slurry into the liquid-solid fluidized bed 120 is centered (i.e., directly adding the large-particle-size coal slurry into the liquid-solid fluidized bed 120 in a nearly vertical manner above the liquid-solid fluidized bed 120), which results in impact of the large-particle-size coal slurry on the liquid-solid fluidized bed 120 and further reduces the sorting effect of the liquid-solid fluidized bed 120.

As shown in fig. 3, the liquid-solid fluidized bed 120 includes a bed body 121 and a top cover plate 126, a feeding tray 130 is located in the sorting chamber 127, an internal discharge port is defined between the top cover plate 126 and the feeding tray 130, and a feeding trough 131 is connected with the sorting chamber 127 through the internal discharge port. Thus, not only the inlet above the liquid-solid fluidized bed 120 can be covered by the top cover plate 126 to prevent the small-particle-size coal slime or the coal slime which is not classified from entering the liquid-solid fluidized bed 120, but also the flow rate of the large-particle-size coal slime discharged into the liquid-solid fluidized bed 120 in the feeding trough 131 can be more stable through the top cover plate 126.

Further, the direction of extension of the inner discharge opening is perpendicular to the axial direction of the sorting chamber 127. Thus, the middle region of the liquid-solid fluidized bed 120 defines an internal discharge port to facilitate placement of the feed trough 131 and to provide for more reasonable spatial distribution of the various components of the coal slurry sorting apparatus 100.

As shown in fig. 1, the number of classifying cyclones 110 is plural, the speed reducing baffle 150 is annular, and the classifying cyclones 110 are distributed inside the speed reducing baffle 150. Therefore, according to the production requirement of the slime separation device 100, the plurality of classifying cyclones 110 are arranged on the inner side of the deceleration baffle 150, so that the productivity of the classifying cyclones 110 is matched with that of the liquid-solid fluidized bed 120, thereby avoiding the waste of productivity, improving the production efficiency and reducing the cost.

As shown in fig. 2, the number of classifying cyclones 110 is plural, the speed reducing baffle 150 is annular, and the classifying cyclones 110 are uniformly distributed inside the speed reducing baffle 150. In this way, the plurality of classifying cyclones 110 can be arranged in the annular area defined by the annular decelerating barrier 150, so that the coal slime classified by the classifying cyclones 110 can meet the production requirement of the liquid-solid fluidized bed 120, the productivity collocation between the classifying cyclones 110 and the liquid-solid fluidized bed 120 is more reasonable, and the production efficiency of the coal slime sorting device 100 in unit time is improved.

As shown in fig. 1, 5, 6 and 7, the liquid-solid fluidized bed 120 includes: the machine tool 121, the machine tool 121 defines a sorting chamber 127 therein, the top end of the machine tool 121 is open and is formed with an overflow groove 1211, the overflow groove 1211 is provided with a flash port, the feeding tray 130 is connected with the machine tool 121 on the inner side of the inner wall of the machine tool 121, the machine tool 121 comprises an annular inner side wall, an annular outer side wall and a plurality of conical bottom walls 1212 connected between the inner side wall and the outer side wall, the plurality of conical bottom walls 1212 are uniformly distributed along the circumferential direction of the machine tool 121, and the bottom of each conical bottom wall 1212 is provided with an underflow outlet 128.

Specifically, the large-particle size coal slurry is separated into two parts of small-density coal slurry and large-density coal slurry in the liquid-solid fluidized bed 120, the small-density coal slurry flows into the overflow groove 1211 along the upper end of the bed 121 and is discharged through the overflow port, and the large-density coal slurry is deposited in the cone body defined by the plurality of cone-shaped bottom walls 1212. In this way, the high-density coal slime is deposited in the plurality of vertebral bodies, so that the deposition effect of the high-density coal slime is better, the dehydration area of the high-density coal slime in unit volume is increased, the high-density coal slime is dehydrated faster, the dehydration effect is better, and the dehydration efficiency of the liquid-solid fluidized bed 120 is improved.

As shown in fig. 1 and 2, the liquid-solid fluidized bed 120 further includes: the controller 122, the pressure sensor 123 and the actuating mechanism 124, the pressure sensor 123 is arranged in the sorting chamber 127, the pressure sensor 123 is electrically connected with the controller 122 to send pressure information to the controller 122, the actuating mechanism 124 is provided with a pressing rod 1241, a part of the pressing rod 1241 stretches into the sorting chamber 127 and seals the underflow outlet 128, and the controller 122 is electrically connected with the actuating mechanism 124 to drive the actuating mechanism 124 to act and enable the pressing rod 1241 to lift from the underflow outlet 128 when the pressure exceeds a preset value.

In this way, the pressure in the sorting chamber 127 can be measured in real time through the plurality of pressure sensors 123, so that when the pressure in a certain area of the sorting chamber 127 is too high, the corresponding underflow outlet 128 is opened, so that the pressure distribution in the sorting chamber 127 is more uniform, the distribution of the high-density coal slime in the liquid-solid fluidized bed 120 is more uniform, the pressure fluctuation of the bed layer is reduced, and the sorting effect of the liquid-solid fluidized bed 120 is more ideal.

In the particular embodiment shown in fig. 4, the liquid-solid fluidized bed 120 further comprises: the water supply pipeline 125, the water supply pipeline 125 has the outlet pipe 1251 that is located in the separation cavity 127, and the number of outlet pipe 1251 is a plurality of, and every outlet pipe 1251 extends along the radial of lathe bed 121 and a plurality of outlet pipe 1251 are equispaced along the circumference of lathe bed 121, have a plurality of water jet 12511 that distribute in proper order along the radial of lathe bed 121 on every outlet pipe 1251, and the water jet 12511 on the outlet pipe 1251 increases from inside to outside distribution density gradually.

In this way, the water outlet pipes 1251 distributed in the separation chamber 127 along the radial direction form uniform ascending water flow in the separation chamber 127, and the water jet 12511 with gradually increased density from inside to outside can effectively buffer feeding impact, so that the flow speed of the ascending water flow in the feeding area of the liquid-solid fluidized bed 120 is consistent with the flow speed of the ascending water flow in other areas, and further the separation efficiency of the liquid-solid fluidized bed 120 is more stable and the working stability is higher.

The operation of the slime separation device 100 according to the embodiment of the present invention will be described in detail with reference to fig. 1.

As shown in fig. 1, first, the water supply line 125 supplies water to the liquid-solid fluidized bed 120 so that an ascending water flow is formed in the liquid-solid fluidized bed 120, and a part of the water flows into the feed tank 131 so that the level of the water in the feed tank 131 does not separate the cyclone underflow port 112.

Further, the slurry is pumped into the classifying cyclone 110 by the slurry pump 600, classified into large-particle-size slurry and small-particle-size slurry in the classifying cyclone 110, the small-particle-size slurry is discharged to the next step through the overflow pipe 111 located above the classifying cyclone 110, the large-particle-size slurry flows out into the feed tray 130 through the classifying cyclone underflow port 112, and the large-particle-size slurry is buffered and slowed down in the feed tray 130, and then flows out to the liquid-solid fluidized bed 120 through the side wall of the feed chute 131.

In the liquid-solid fluidized bed 120, the large-particle-size coal slime is separated into large-density coal slime and small-density coal slime, the small-density coal slime flows out of the separation chamber 127 along the overflow groove 1211 under the action of ascending water flow and is discharged to the next process through a flash port, the large-density coal slime is deposited above the plurality of underflow outlets 128, the plurality of pressure sensors 123 respectively collect the pressure above the plurality of underflow outlets 128, when the pressure exceeds a calibration value, the execution mechanism 124 is powered through the controller 122, so that the pressure rod 1241 is operated under the driving of the execution mechanism 124, the underflow outlets 128 are opened, the large-density coal slime is discharged from the liquid-solid fluidized bed 120, the separation of the coal slime is completed, and when the pressure returns to below the calibration value, the underflow outlets 128 are closed.

Wherein each pressure sensor 123 corresponds to an actuator 124 and a controller 122 and each pressure sensor 123 and the corresponding actuator 124 and controller 122 can be operated individually to cause one or more underflow outlets 128 to open to maintain pressure stability within the sorting chamber 127.

Thus, the following technical effects can be achieved:

(1) The inside of the classifying cyclone 110 forms a good working environment, effectively prevents the generation of air columns, prevents the occurrence of a suck-back phenomenon, and improves the classifying effect of the classifying cyclone 110.

(2) The flow rate of the large-granularity coal slime flowing to the liquid-solid fluidized bed 120 is reduced through the feeding tray 130 and the decelerating barrier 150, and the large-granularity coal slime flows into the liquid-solid fluidized bed 120 along the horizontal direction, so that the impact of the large-granularity coal slime on the liquid-solid fluidized bed 120 is reduced, and the sorting effect of the liquid-solid fluidized bed 120 is improved.

(3) The classifying cyclones 110 can be arranged according to the sorting speed of the liquid-solid fluidized bed 120, so that the production collocation of the liquid-solid fluidized bed 120 and the classifying cyclones 110 is more reasonable, the production efficiency is improved, and the productivity waste is reduced.

(4) The pressure distribution of the sorting chamber 127 is more uniform due to the arrangement of the pressure sensors 123, the compression rods 1241 and the actuating mechanism 124, so that the material distribution in the sorting chamber 127 is more uniform, and the bed densities of all areas are consistent, so that the sorting effect of the liquid-solid fluidized bed 120 is kept stable and reliable.

(5) By the arrangement of the plurality of conical bottom walls 1212 below the sorting chamber 127, the dewatering area per unit volume of the high-density coal slime is made larger, so that the dewatering efficiency of the high-density coal slime is effectively improved.

As shown in fig. 8, the slime separation system according to the embodiment of the second aspect of the present invention includes: a slime storage device 200, a slime sorting device 100, a coarse and medium slime a screening device 300, a coarse and medium slime a screening device 400, and a clean coal flotation device 500 as in the above embodiments.

The coal slime storage device 200 is used for storing coal slime raw materials, a discharge hole of the coal slime storage device 200 is connected with a feeding hole 113 of a classifying cyclone, the classifying cyclone 110 is provided with an overflow pipe 111, and the bottom of the liquid-solid fluidized bed 120 is provided with an underflow outlet 128.

The coarse and medium slime a screening device 300 comprises a high-frequency vibrating screen 310, a thickener 320 and a first filter press 330, wherein the high-frequency vibrating screen 310 is suitable for screening out coarse and medium slime a and supplying screened liquid to the thickener 320, a solid outlet of the thickener 320 is connected with the first filter press 330, a liquid outlet of the thickener 320 is connected with a liquid outlet of the first filter press 330, and a solid outlet of the first filter press 330 is suitable for discharging tail slime c.

Coarse and medium coal slime a screening device 400 comprises a concentration cyclone 410 and a linear vibrating screen 420 connected with a bottom flow port of the concentration cyclone 410, wherein the bottom flow port of the concentration cyclone 410 is connected with the linear vibrating screen 420, and the linear vibrating screen 420 is suitable for screening coarse and medium coal slime b.

The clean coal flotation device 500 comprises a pulp preparation device 510, a flotation column 520 and a second filter press 530, wherein liquid after being sieved by the linear vibrating screen 420 is converged with an overflow port of the concentration cyclone 410 and an overflow pipe 111 of the classification cyclone 110 and is communicated with a feed port of the pulp preparation device 510, an outlet of the pulp preparation device 510 is connected with the flotation column 520, a bottom outlet of the flotation column 520 is connected with a feed port of the thickener 320, an overflow port of the flotation column 520 is communicated with a feed port of the second filter press 530, a solid outlet of the second filter press 530 is suitable for discharging the clean coal d for flotation, and a liquid outlet of the filter press is suitable for being communicated with the feed port of the pulp preparation device 510.

Thus, the slime storage device 200 supplies the slime to the slime separation device 100, and the slime separation device 100 sorts and sorts the slime and then supplies the same to the coarse and medium slime a screening device 300, the coarse and medium slime a screening device 400, and the clean coal flotation device 500, respectively, to obtain coarse and medium slime a, coarse and clean slime b, and tail slime c, and clean coal d, respectively.

As shown in the figure, the invention further provides a separation method using the coal slime separation system, which comprises the following steps:

classifying and sorting: separating the coal slime raw material into small-granularity coal slime and large-granularity coal slime through a cyclone separation process, and separating the large-granularity coal slime through a liquid-solid fluidization process to obtain large-density coal slime and small-density coal slime;

sorting coarse coal slime a: selecting high-density coal slime through a high-frequency vibrating screen 310, obtaining coarse and medium coal slime a on the screen, dehydrating and press-filtering undersize materials, and finally obtaining tail coal slime c and circulating water e;

sorting coarse refined coal slime b: concentrating the small-density coal slime, screening the solid obtained after concentration, obtaining coarse refined coal slime b on a screen, and sending undersize and liquid generated in the concentration process to flotation;

and (3) refined coal flotation: and mixing undersize obtained in classifying and sorting the small-granularity coal slime and coarse refined coal slime with liquid produced in the concentration process, floating and press-filtering to obtain floating refined coal d after press-filtering, and refluxing the liquid produced in press-filtering to the mixing process.

The slime separation system and the separation method according to the present invention will be described in detail with reference to fig. 8.

As shown in fig. 8, the slime separation system includes a slime storage device 200, a slime separation device 100, a coarse and medium slime a screening device 300, a coarse and medium slime a screening device 400, and a clean coal flotation device 500. The coal slime separation device 100 consists of a classification cyclone 110, a liquid-solid fluidized bed 120 and a feeding tray 130; the coarse and medium coal slime a screening device 300 consists of a high-frequency vibrating screen 310, a thickener 320 and a first filter press 330; the coarse and medium coal slime a screening device 400 consists of a concentration cyclone 410 and a linear vibrating screen 420; the clean coal flotation device 500 consists of a slurry preparation 510, a flotation column 520 and a second filter press 530.

As shown in fig. 8, the separation method is to inject the rising water flow into the liquid-solid fluidized bed 120 until the rising water flow is not fixed after the rising water flow is formed in the liquid-solid fluidized bed 120 and the rising water flow is not separated into the cyclone underflow port 112. Raw coal slurry stored in the slurry storage device 200 is flowed into the classification cyclone 110 by the slurry pump 600, classified into large-particle-size coal slurry and small-particle-size coal slurry in the classification cyclone 110, and the small-particle-size coal slurry flows through the overflow pipe 111 of the classification cyclone 110 and is collected in the clean coal flotation device 500.

The large-granularity coal slime flows into the feeding tray 130 through the bottom flow port 112 of the classifying cyclone, flows into the liquid-solid fluidized bed 120 from the feeding tray 130, is separated into large-density coal slime and small-density coal slime in the liquid-solid fluidized bed 120, flows out of the liquid-solid fluidized bed 120 through the overflow port of the liquid-solid fluidized bed and is converged into the coarse coal slime a screening device 400 under the action of ascending water flow, the large-density coal slime is deposited in the liquid-solid fluidized bed 120, and when the pressure exceeds a set value, the bottom flow outlet 128 of the liquid-solid fluidized bed 120 is opened under the action of the actuating mechanism 124, and then the large-density coal slime flows into the coarse coal slime a screening device 300.

Further, the high-density coal slime in the coarse and medium slime a screening device 300 is separated into coarse and medium slime a and undersize by the screening of the high-frequency vibrating screen 310, the undersize is dehydrated in the thickener 320, enters the first filter press 330 for further dehydration and is formed into tail slime c, and the dehydrated water is continuously participated in the sorting process in the form of circulating water e.

The small density coal slurry in the coarse and medium coal slurry a screening apparatus 400 is dewatered by the concentrating cyclone 410 and further separated on the linear vibrating screen 420 to be separated into coarse and fine coal slurry b and undersize, which are collected into the fine coal flotation apparatus 500.

Thus, the small-size coal slime and undersize materials in the coarse and medium coal slime a screening device 400 are fed into the ore pulp preparation device 510, the ore pulp preparation device 510 adjusts the concentration of the small-size coal slime and undersize materials, the small-size coal slime and undersize materials enter the flotation column 520 after the concentration is proper, the flotation column 520 performs flotation on the small-size coal slime and undersize materials, and the small-size coal slime is divided into two parts, wherein one part enters the second filter press 530 to be formed into flotation clean coal d after flotation, and the other part enters the thickener 320 to be formed into tail coal slime c after dehydration.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the structures or units referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (9)

1. A coal slurry sorting apparatus, comprising:

a classifying cyclone;

a liquid-solid fluidized bed having a sorting chamber; and

the feeding tray is connected with the liquid-solid fluidized bed at the upper part of the liquid-solid fluidized bed, is positioned in the separation cavity and is provided with a feeding groove communicated with the separation cavity;

the classifying cyclone is provided with a classifying cyclone underflow opening, and the classifying cyclone underflow opening extends into the feeding groove;

the liquid-solid fluidized bed comprises:

the sorting chamber is defined in the machine body, a flash port is formed by opening the top end of the machine body, the feeding tray is connected with the machine body on the inner side of the inner wall of the machine body, the machine body comprises an annular inner side wall, an annular outer side wall and a plurality of conical bottom walls connected between the inner side wall and the outer side wall, the conical bottom walls are uniformly distributed along the circumferential direction of the machine body, and an underflow outlet is formed in the bottom of each conical bottom wall;

the speed reducing baffle plate extends into the feeding groove and is spaced from the bottom wall of the feeding groove, and the speed reducing baffle plate is radially positioned between the classifying cyclone and the side wall of the feeding tray;

the pressure sensor is arranged in the sorting chamber, the pressure sensor is electrically connected with the controller to send pressure information to the controller, the executing mechanism is provided with a pressing rod, a part of the pressing rod stretches into the sorting chamber and seals the underflow outlet, the controller is electrically connected with the executing mechanism to drive the executing mechanism to act and enable the pressing rod to lift up from the underflow outlet when the pressure exceeds a preset value, and the pressure in the sorting chamber is measured in real time through a plurality of pressure sensors to enable the corresponding underflow outlet to be opened when the pressure in a certain area of the sorting chamber is too high.

2. The coal slime separation device according to claim 1, wherein an insertion protrusion is further provided in the feeding tray, and the insertion protrusion extends into the classifying cyclone underflow opening to partially block the classifying cyclone underflow opening.

3. The coal slime separation device according to claim 1, wherein the liquid-solid fluidized bed comprises a bed body and a top cover plate covered on the bed body, the speed reducing baffle is connected to the top cover plate, the feeding tray is located in the separation chamber, an inner discharge opening is jointly defined between the top cover plate and the top wall of the feeding tray, and the feeding trough is connected with the separation chamber through the inner discharge opening.

4. A slime separation device according to claim 3, characterized in that the extension direction of the inner discharge opening is perpendicular to the axial direction of the separation chamber.

5. The coal slurry sorting apparatus of claim 3, wherein the sorting chamber is annular in cross section, the side walls of the bed include an inner side wall and an outer side wall, and the feed tray is connected to the inner side wall of the sorting apparatus.

6. The slime separation device according to claim 1, wherein the number of the classifying cyclones is plural, the deceleration baffle is ring-shaped, and the plurality of classifying cyclones are uniformly distributed inside the deceleration baffle.

7. The coal slurry sorting apparatus of claim 6, wherein the liquid-solid fluidized bed further comprises:

the water supply pipeline is provided with a plurality of water outlet pipes positioned in the sorting cavity, each water outlet pipe extends along the radial direction of the lathe bed and a plurality of water outlet pipes are uniformly distributed along the circumferential direction of the lathe bed, each water outlet pipe is provided with a plurality of water spray ports which are sequentially distributed along the radial direction of the lathe bed, and the distribution density of the water spray ports on the water outlet pipes is gradually increased from inside to outside.

8. A coal slurry sorting system, comprising:

the coal slime storage device is used for storing coal slime raw materials;

the coal slurry sorting apparatus of any one of claims 1-7, a discharge port of the coal slurry storage apparatus being connected to a feed port of the classifying cyclone, the classifying cyclone having an overflow pipe, a bottom of the liquid-solid fluidized bed having an underflow outlet;

the coarse and medium slime screening device comprises a high-frequency vibrating screen, a thickener and a first filter press, wherein the high-frequency vibrating screen is suitable for screening coarse and medium slime and supplying screened liquid to the thickener, a solid outlet of the thickener is connected with the first filter press, a liquid outlet of the thickener is converged with a liquid outlet of the first filter press, and a solid outlet of the first filter press is suitable for discharging tail slime;

the coarse clean coal slime screening device comprises a concentration cyclone and a linear vibrating screen connected with a bottom flow port of the concentration cyclone, wherein the bottom flow port of the concentration cyclone is connected with the linear vibrating screen, and the linear vibrating screen is suitable for screening coarse clean coal slime;

the clean coal flotation device comprises an ore pulp preparation device, a flotation column and a second filter press, wherein liquid after the linear vibrating screen is screened is converged with an overflow port of a concentration cyclone and an overflow pipe of a classification cyclone and is communicated with a feed port of the ore pulp preparation device, an outlet of the ore pulp preparation device is connected with the flotation column, a bottom outlet of the flotation column is connected with the feed port of the thickener, the overflow port of the flotation column is communicated with the feed port of the second filter press, a solid outlet of the second filter press is suitable for discharging clean coal for flotation, and a liquid outlet of the filter press is suitable for being communicated with the feed port of the ore pulp preparation device.

9. A method of sorting using the coal slurry sorting system of claim 8, comprising:

classifying and sorting: separating the coal slime raw material into small-granularity coal slime and large-granularity coal slime through a cyclone separation process, and separating the large-granularity coal slime through a liquid-solid fluidization process to obtain large-density coal slime and small-density coal slime;

sorting coarse and medium slime: high-frequency vibration screening is carried out on the high-density coal slime to obtain coarse medium-density coal slime, and dehydration and filter pressing are carried out on undersize materials to obtain tail coal slime and circulating water;

sorting coarse refined coal slime: concentrating the small-density coal slime, screening the solid obtained after concentration, obtaining coarse and refined coal slime on a screen, and sending undersize and liquid generated in the concentration process to flotation;

and (3) refined coal flotation: and mixing undersize obtained in classification and separation of small-granularity coal slime and coarse refined coal slime with liquid produced in the concentration process, floating and press-filtering to obtain floating refined coal after press-filtering, and refluxing the liquid produced in press-filtering to the mixing process.