CN215744121U

CN215744121U - High-precision separation system for coal slime flotation three products

Info

Publication number: CN215744121U
Application number: CN202121818067.8U
Authority: CN
Inventors: 王怀法; 杜玉民
Original assignee: Taiyuan Ruifu Coal Preparation Technology Co ltd
Current assignee: Fudejing Zhejiang Technology Co ltd
Priority date: 2021-08-05
Filing date: 2021-08-05
Publication date: 2022-02-08
Anticipated expiration: 2031-08-05

Abstract

The utility model belongs to the technical field of fine coal and mineral flotation, and discloses a high-precision separation system for coal slime flotation three products, which comprises a first-stage flotation machine and a second-stage flotation machine, wherein the first-stage flotation machine is used as a roughing section and adopts a high-bubble surface flux flotation machine with a closed top, the second-stage flotation machine is used as a fine separation section and adopts a top-open structure, the first-stage flotation machine adopts a reverse fluidized dynamic foam washing and purifying mode, and coarse concentrate foam is connected with a feeding pipe of the fine separation section through a pipeline; and the two-stage flotation machine respectively regulates and controls the foam ash content of the rough concentrate and the final concentrate by adopting a foam layer lower spraying and washing mode. The selective cycle mineralization mode of the coarse particles at the bottom prevents the loss of coarse clean coal in tailings and middlings, ensures the maximization of the recovery rate of the clean coal, and improves the separation precision of the three products.

Description

High-precision separation system for coal slime flotation three products

Technical Field

The utility model belongs to the technical field of coal slime flotation machines, and particularly relates to a high-precision separation system for three products of coal slime flotation.

Background

The froth flotation is a general method for selecting minerals from micro-fine ore pulp, and because a one-stage flotation process is mostly adopted in a coking coal preparation plant in China, two products of clean coal and tail coal are produced. However, in actual production, the ash content of the tail coal is low when the ash content of the clean coal is ensured, and the ash content of the float clean coal is high when the recovery rate of the clean coal is ensured, so that the aim of combining the quality and the recovery rate of the float clean coal is difficult to achieve. In recent years, in order to solve the technical problems, two technical schemes are adopted in a coal preparation plant, one scheme is to realize a 'roughing-concentrating' process in a 5-chamber 3+2 ladder arrangement mode of a mechanical stirring type flotation machine, namely, a front three chambers are used as roughing sections to separate roughing clean coal with higher ash content, and the roughing clean coal automatically flows into a rear two chambers arranged in a ladder arrangement to be used as concentrating sections to re-concentrate the roughing high ash clean coal in the front three chambers so as to reduce the ash content of the clean coal. However, in the sorting system, a large amount of clear water is required to be added into a feeding groove of a sorting section to dilute the concentration of the fed materials of the sorting section, so that the sorting selectivity is improved, on the other hand, when the ash content of one-section rough sorting tail coal is high, almost all high-ash fine mud enters coarse clean coal, so that the ash content of the coarse clean coal is too high, the ash content of the two-section recleaning clean coal is unstable and difficult to effectively regulate, namely, a reasonable ash content difference needs to be controlled, under the condition, when the floatability of the coal slime of the one-section rough sorting tail coal ash content is difficult to control, the discharged tail coal ash content is difficult to guarantee, the clean coal loss of a second-section sorted middling product is large, and the precise separation of the tail coal, the middling and the clean coal product is still difficult to guarantee.

SUMMERY OF THE UTILITY MODEL

The utility model overcomes the defects of the prior art, and solves the technical problems that: the utility model provides a coal slime flotation three-product high accuracy sorting system to solve the technical problem that current three-product flotation system sorting precision is low, is difficult to ensure tailing, middlings and clean coal productivity and ash content.

In order to solve the technical problems, the utility model adopts the technical scheme that: a high-precision separation system for three products of coal slime flotation comprises a first-stage flotation machine and a second-stage flotation machine, wherein the first-stage flotation machine comprises a bubble mineralizer, a first separation barrel and a first lower barrel body, a concentrate pipe is arranged in the center of the top of the first separation barrel, a conical spray water section is arranged on the outer side of the top of the first separation barrel, and fed coal slime water enters the first separation barrel after passing through the bubble mineralizer; the first lower barrel body is arranged at the bottom of the first separation barrel, an inclined plate assembly is arranged in the first lower barrel body, a first circulating pipe is arranged at the bottom of the first lower barrel body, and the first circulating pipe is connected with an ore pulp inlet on the bubble mineralization device through a feeding pump;

the second-stage flotation machine comprises a second sorting barrel, a second lower barrel body and a circulating mineralization generator; a concentrate overflow groove is formed in the top of the outer side of the second separation barrel, the bottom of the outer side of the second separation barrel is connected with an outlet of the circulating mineralization generator, a sprayer and a feeding pipe are arranged at the top of the inner side of the second separation barrel, a turbulent flow grid is arranged below the sprayer, and the bottom of the feeding pipe penetrates below the turbulent flow grid; the second lower barrel body is positioned below the second separation barrel, an inclined plate assembly is arranged in the second lower barrel body, a second circulating pipe is arranged at the bottom of the second lower barrel body, and the second circulating pipe is connected with an inlet of the circulating mineralization generator through a circulating pump;

the concentrate pipe is communicated with the top of the feeding pipe through a connecting pipe.

The inclined plate assembly comprises a plurality of inclined plates, and the inclined plates are obliquely arranged and are mutually parallel.

The first-stage flotation machine further comprises a tailing adjusting barrel, the second-stage flotation machine further comprises a middling adjusting barrel, and the first lower barrel body and the second lower barrel body are respectively communicated with the tailing adjusting barrel and the middling adjusting barrel; the bottom parts of the first lower barrel body and the second lower barrel body are respectively provided with a V-shaped groove bottom, and the first circulating pipe and the second circulating pipe are arranged at the bottom parts of the V-shaped groove bottoms.

The bubble mineralization device comprises a gas distribution ring, an ore pulp distribution ring and a plurality of jet mineralization devices uniformly distributed on the periphery of a first separation barrel, a plurality of slurry gas nozzles are arranged at the bottom of the first separation barrel, a plurality of gas outlets are arranged on the gas distribution ring, and a plurality of ore pulp outlets are arranged on the ore pulp distribution ring; the gas outlet on the gas distribution ring and the ore pulp outlet on the ore pulp distribution ring are respectively connected with a gas inlet and an ore pulp inlet of a jet mineralization device and used for providing gas and ore pulp for the jet mineralization device, and the aerated ore pulp outlet of the jet mineralization device is communicated with the slurry gas nozzle.

The bubble mineralizer also comprises an aerated pulp distribution ring, and an aerated pulp outlet of the jet mineralizer is communicated with the pulp gas nozzle through the aerated pulp distribution ring.

The high-precision separation system for the coal slime flotation three products further comprises a clean water pump, and the clean water pump is used for providing spraying water for the spraying water section and the sprayer.

The high-precision separation system for the coal slime flotation three products is characterized in that the spraying water section comprises a conical inner wall, and a plurality of water spraying ports are uniformly formed in the conical inner wall; the sprayer comprises a spraying annular pipe, and a plurality of water spraying ports are uniformly arranged on the spraying annular pipe.

Compared with the prior art, the utility model following beneficial effect has:

the utility model provides a high-precision separation system for coal slime flotation three products, which comprises a first-stage flotation machine and a second-stage flotation machine, wherein the first-stage flotation machine is used as a coarse separation section and adopts a high-bubble surface flux flotation machine with a closed top, so that non-foam layer flotation under the condition of dynamic foam washing and purification is realized, high-ash tail coal is discharged to the maximum extent, and simultaneously, the coarse clean coal is ensured to carry a minimum amount of high-ash particles; the coarse and clean coal foam concentration of the first-stage flotation machine is lower than that of the conventional flotation machine, so that the coarse and clean coal foam can be directly used as a feed of a second-stage flotation machine. The two-stage flotation machine is used as a fine separation section, a flotation column with a new structure and an open top is adopted, the foam of the fine coal is purified and floated by adopting a foam layer lower spray washing mode, and a coarse particle selective circulating mineralization mode is adopted at the bottom, so that the loss of coarse fine coal in tailings and middlings is prevented, the recovery rate of the fine coal is maximized, and the separation precision of three products is improved.

Drawings

FIG. 1 is a schematic structural diagram of a high-precision separation system for coal slime flotation three products according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a tilt plate assembly according to an embodiment of the present invention.

In the figure: 1-separation barrel, 2-conical spray water section, 3-lower barrel body, 4-gas distribution ring, 5-ore pulp distribution ring, 6-jet mineralization device, 7-gas inlet, 8-circulating pipe, 9-tailing regulation barrel, 10-separation barrel, 11-concentrate overflow tank, 12-turbulent grid, 13-lower barrel body, 14-circulating pipe, 15-middling regulation barrel, 16-circulating mineralization generator, 17-ore pulp inlet, 18-fine ore pipe, 19-connecting pipe, 20-feeding pipe, 21-spray water pipe system, 22-water inlet pipe, 23-clear water barrel, 24-clear water pump, 25-feeding barrel, 27-feeding pump, 28-circulating pump, 29-slurry gas nozzle, 30-gas-filled ore pulp distribution ring, 31-inclined plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the utility model provides a high-precision separation system for coal slime flotation three products, which comprises a first-stage flotation machine and a second-stage flotation machine. That is to say, the separation system of the embodiment is composed of two sections of separation tanks, wherein, a first section of flotation machine is used as a rough separation section, a high-bubble surface flux flotation machine with a closed top is adopted, a second section of flotation machine is used as a fine separation section, a new structure flotation column with an open top is adopted, and the concentrate foam of the rough separation section is connected with a feeding pipe of the fine separation section through a pipeline; the rough separation section adopts a reverse fluidization dynamic foam washing and purifying mode, and the fine separation section adopts a foam layer lower spraying and washing mode to respectively regulate and control the foam ash content of rough concentrate and final concentrate.

As shown in fig. 1, in this embodiment, the first-stage flotation machine includes a bubble mineralizer, a first separation barrel 1 and a first lower barrel 3, a concentrate pipe 18 is disposed in the center of the top of the first separation barrel 1, a conical spray water section 2 is disposed outside the top, and fed coal slurry water enters the first separation barrel 1 after passing through the bubble mineralizer; the first lower barrel body 3 is arranged at the bottom of the first separation barrel 1, the inclined plate assembly is arranged in the first lower barrel body 3, the bottom of the first lower barrel body is provided with a first circulating pipe 8, and the first circulating pipe 8 is connected with an ore pulp inlet 17 on the bubble mineralization device through a feeding pump 27.

As shown in fig. 1, in the present embodiment, the secondary flotation machine includes a second separation tank 10, a second lower tank body 13, and a circulating mineralization generator 18; a concentrate overflow trough 11 is arranged at the top of the outer side of the second separation barrel 10, the bottom of the outer side of the second separation barrel is connected with an outlet of a circulating mineralization generator 18, a sprayer 21 and a feeding pipe 20 are arranged at the top of the inner side of the second separation barrel, a turbulent flow grid 12 is arranged below the sprayer 21, and the bottom of the feeding pipe 20 penetrates below the turbulent flow grid 12; the second lower barrel body 13 is positioned below the second separation barrel 10, an inclined plate assembly is arranged in the second lower barrel body, a second circulating pipe 14 is arranged at the bottom of the second lower barrel body, and the second circulating pipe 14 is connected with an inlet of the circulating mineralization generator 16 through a circulating pump 28. The concentrate pipe 18 is communicated with the top of the feeding pipe 20 through a connecting pipe 19.

Specifically, in the present embodiment, as shown in fig. 2, the inclined plate assembly disposed in the first lower tub 3 includes a plurality of inclined plates 31, and the inclined plates 31 are disposed obliquely and parallel to each other. The second lower barrel 13 is also provided with an inclined plate assembly with the same structure.

Further, as shown in fig. 1, in this embodiment, the first-stage flotation machine further includes a tailing regulating barrel 9, the second-stage flotation machine further includes a middling regulating barrel 15, and the first lower barrel body 3 and the second lower barrel body 13 are respectively communicated with the tailing regulating barrel 9 and the middling regulating barrel 15; the bottoms of the first lower barrel body 3 and the second lower barrel body 13 are both provided with V-shaped groove bottoms, and the first circulating pipe 8 and the second circulating pipe 14 are arranged at the bottoms of the V-shaped groove bottoms.

Further, as shown in fig. 1, the bubble mineralization device comprises a gas distribution ring 4, an ore pulp distribution ring 5 and a plurality of jet mineralization devices 6 uniformly distributed on the periphery of the first separation barrel 1, the bottom of the first separation barrel 1 is provided with a plurality of slurry gas nozzles 29, the gas distribution ring 4 is provided with a plurality of gas outlets, and the ore pulp distribution ring 5 is provided with a plurality of ore pulp outlets; the gas outlet on the gas distribution ring 4 and the pulp outlet on the pulp distribution ring 5 are respectively connected with the gas inlet and the pulp inlet of a jet mineralization device 6 and used for providing gas and pulp for the jet mineralization device 6, and the aerated pulp outlet of the jet mineralization device 6 is communicated with the pulp gas nozzle 29.

Further, as shown in fig. 1, in the present embodiment, the bubble mineralizer further includes an aerated slurry distribution ring 30, and the aerated slurry outlet of the jet mineralizer 6 is communicated with the slurry gas nozzle 29 through the aerated slurry distribution ring 30.

Specifically, in this embodiment, the gas distribution ring 4, the pulp distribution ring 5, and the aerated pulp distribution ring 30 are all ring structures disposed at the periphery of the first separation barrel 1, and each jet mineralization device 6 can work under the same working condition through the gas distribution ring 4 and the pulp distribution ring 5 of the ring structures. By providing the aerated pulp distribution ring 30, each of the pulp-air nozzles 29 can be made to work under the same working conditions, and the aerated pulp enters the first separation tub 1 to be more stable and uniform.

Further, as shown in fig. 1, the high-precision separation system for the coal slime flotation three-product of the embodiment further includes a clean water pump 25, and the clean water pump 24 is used for providing the spray water for the spray water section 2 and the sprayer 21.

Specifically, as shown in fig. 1, in this embodiment, the spraying water section 2 includes a conical inner wall, and a plurality of water spraying nozzles are uniformly arranged on the conical inner wall; the sprayer 21 comprises a spraying annular pipe, and a plurality of water spraying openings are uniformly formed in the spraying annular pipe.

The working principle of the utility model is as follows:

1. when the device works, a collecting agent and a foaming agent are added into fresh coal slime water for size mixing, the fresh coal slime water enters a material inlet barrel 25, the fresh coal slime water is pressurized by a material inlet pump 27 and then is sent into an ore pulp inlet 17 on a bubble mineralizer of a section of flotation machine with a closed top, the ore pulp is uniformly distributed to a plurality of jet mineralizers 6 through an ore pulp distribution ring 5 of the bubble mineralizer to suck air to generate bubbles, particle bubbles are mixed at the jet mineralizer 6 and an extension pipe thereof in a high strength manner to form mineralized bubbles, then the mineralized bubbles pass through an aerated ore pulp distribution ring 30 and a slurry gas nozzle 29 and enter a first separation barrel 1 from the lower part, the air suction amount is regulated and controlled by a valve through an air inlet 7, and the air suction amount is uniformly distributed to the plurality of jet mineralizers 6 through a gas distribution ring 4, so that each jet mineralizer can work under the same working condition; mineralized bubbles and ore pulp flow are separated in a first separation barrel 1, the mineralized bubbles float upwards at the upper part of the separation barrel 1, are washed and purified by a conical spray water section 2 and then are guided into a position below a turbulence grid 12 arranged in a second separation barrel 10 with an open top through a concentrate pipe 18, a connecting pipe 19 and a feeding pipe 20; except mineralized bubbles, the tailings flow downwards to enter a first lower barrel body 3 connected with the lower part of the separation barrel 1, the bubbles carried along with the tailings flow in an inclined plate assembly arranged in the first lower barrel body 3 are isolated and turn back to enter the first separation barrel 1, and coarse particles return to an inlet of a feeding pump 27 through a first circulating pipe 8 to be circularly separated. The tailings are discharged through a tailing adjusting barrel 9 and enter a tailing treatment process.

2. One section of coarse concentrate foam entering the second separation barrel 10 passes through a turbulence grid 12 and floats upwards in the second separation barrel 10, the coarse concentrate foam is washed and purified by a spray water pipe system 21 arranged below a foam layer and then overflows into a concentrate overflow trough 11 to enter a clean coal treatment process, middling flow flows downwards into a second lower barrel body 13, bubbles carried along with the middling flow in an inclined plate assembly arranged in the second lower barrel body 13 are isolated and turn back to enter the second separation barrel 10, coarse particles enter a circulating mineralization generator 16 after being pressurized by a circulating pump 28 through a circulating pipe 14 and are aerated and mineralized to enter the turbulence grid 12 in the separation barrel 10, and the middling flow is discharged through a middling adjusting barrel 15 to enter the middling treatment process, so that the flotation separation process of the coal slime three products is completed.

Compared with the prior art, the utility model has the following beneficial effects: the foam concentration of the rough and clean coal of the first-stage flotation machine is lower than that of the conventional flotation machine, the rough and clean coal can be directly used as a feed of the second-stage flotation machine, a water replenishing ring joint for concentrate recleaning in the conventional process is eliminated, the rough selection section adopts a reverse fluidization dynamic foam washing and purifying mode, and the fine selection section adopts a foam layer lower spraying and washing mode to respectively regulate and control the foam ash content of the rough concentrate and the final concentrate. The selective cycle mineralization mode of the coarse particles at the bottom prevents the loss of coarse clean coal in tailings and middlings, ensures the maximization of the recovery rate of the clean coal, and improves the separation precision of the three products. The technical problems that the existing three-product flotation system is low in separation precision and difficult to guarantee the yield and ash content of tailing, middling and clean coal are solved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The high-precision separation system for the coal slime flotation three products is characterized by comprising a first-stage flotation machine and a second-stage flotation machine, wherein the first-stage flotation machine comprises a bubble mineralizer, a first separation barrel (1) and a first lower barrel body (3), a concentrate pipe (18) is arranged in the center of the top of the first separation barrel (1), a conical spray water section (2) is arranged on the outer side of the top of the first separation barrel (1), and fed coal slime water enters the first separation barrel (1) after passing through the bubble mineralizer; the first lower barrel body (3) is arranged at the bottom of the first sorting barrel (1), an inclined plate assembly is arranged in the first lower barrel body (3), a first circulating pipe (8) is arranged at the bottom of the first lower barrel body, and the first circulating pipe (8) is connected with an ore pulp inlet (17) on the bubble mineralization device through a feeding pump (27);

the secondary flotation machine comprises a second separation barrel (10), a second lower barrel body (13) and a circulating mineralization generator (16); a concentrate overflow trough (11) is arranged at the top of the outer side of the second separation barrel (10), the bottom of the outer side of the second separation barrel is connected with an outlet of a circulating mineralization generator (16), a sprayer (21) and a feeding pipe (20) are arranged at the top of the inner side of the second separation barrel, a turbulent flow grid (12) is arranged below the sprayer (21), and the bottom of the feeding pipe (20) penetrates below the turbulent flow grid (12); the second lower barrel body (13) is positioned below the second sorting barrel (10), an inclined plate assembly is arranged in the second lower barrel body, a second circulating pipe (14) is arranged at the bottom of the second lower barrel body, and the second circulating pipe (14) is connected with an inlet of the circulating mineralization generator (16) through a circulating pump (28);

the concentrate pipe (18) is communicated with the top of the feeding pipe (20) through a connecting pipe (19).

2. A coal slurry flotation three-product high-precision separation system according to claim 1, wherein the inclined plate assembly comprises a plurality of inclined plates (31), and the inclined plates (31) are arranged obliquely and are parallel to each other.

3. The coal slime flotation three-product high-precision separation system as recited in claim 1, wherein the first-stage flotation machine further comprises a tailing regulating barrel (9), the second-stage flotation machine further comprises a middling regulating barrel (15), and the first lower barrel body (3) and the second lower barrel body (13) are respectively communicated with the tailing regulating barrel (9) and the middling regulating barrel (15); the bottoms of the first lower barrel body (3) and the second lower barrel body (13) are respectively provided with a V-shaped groove bottom, and the first circulating pipe (8) and the second circulating pipe (14) are arranged at the bottom of the V-shaped groove bottom.

4. The coal slime flotation three-product high-precision separation system according to claim 1, wherein the bubble mineralizer comprises a gas distribution ring (4), an ore pulp distribution ring (5) and a plurality of jet mineralizers (6) uniformly distributed on the periphery of a first separation barrel (1), a plurality of slurry gas nozzles (29) are arranged at the bottom of the first separation barrel (1), a plurality of gas outlets are arranged on the gas distribution ring (4), and a plurality of ore pulp outlets are arranged on the ore pulp distribution ring (5); the gas outlet on the gas distribution ring (4) and the ore pulp outlet on the ore pulp distribution ring (5) are respectively connected with the gas inlet and the ore pulp inlet of a jet mineralization device (6) and used for providing gas and ore pulp for the jet mineralization device (6), and the gas-filled ore pulp outlet of the jet mineralization device (6) is communicated with the slurry gas nozzle.

5. The coal slime flotation three-product high-precision separation system according to claim 4, wherein the bubble mineralizer further comprises an aerated slurry distribution ring (30), and an aerated slurry outlet of the jet mineralizer (6) is communicated with the slurry gas nozzle (29) through the aerated slurry distribution ring (30).

6. The coal slime flotation three-product high-precision separation system according to claim 1, further comprising a clean water pump (25), wherein the clean water pump (25) is used for supplying spraying water to the spraying water section (2) and the sprayer (21).

7. The coal slime flotation three-product high-precision separation system according to claim 1, wherein the spraying water section (2) comprises a conical inner wall, and a plurality of water spraying ports are uniformly formed in the conical inner wall;

the sprayer (21) comprises a spraying annular pipe, and a plurality of water spraying openings are uniformly formed in the spraying annular pipe.