CN110935204B

CN110935204B - Rake-free concentration device

Info

Publication number: CN110935204B
Application number: CN201911283927.XA
Authority: CN
Inventors: 胡标; 张宇; 王超; 赵二宁; 肖雄; 江雪晴; 邢志杰; 蔡俊杰; 仇成亮; 周佳强; 张金
Original assignee: Anhui University of Science and Technology
Current assignee: Anhui University of Science and Technology
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2022-02-18
Anticipated expiration: 2039-12-13
Also published as: CN110935204A

Abstract

The invention relates to the field of coal slime water treatment, in particular to a rakeless concentration device which comprises a feeding assembly, a flow guide assembly, a clean coal collecting assembly and a central groove body, wherein coal slime water flows from the upper part of the central groove body to the middle part of the central groove body through the feeding assembly and then diffuses towards the periphery, residual mineralized bubbles and fine coal slime after reaction float upwards to a defoaming area in the clean coal collecting assembly, the coal slime water in the central groove body flows in the central groove body after defoaming, along with continuous filling of the coal slime water, the coal slime water above the central groove body overflows from the central groove body to a flow guide settling area in the clean coal collecting assembly, and the flow guide settling area is arranged on the outer side wall of the central groove body. The invention has the advantages that: this device realizes that traditional multistage concentrated pond is structural unites two into one, the area in traditional multistage concentrated pond that has significantly reduced.

Description

Rake-free concentration device

Technical Field

The invention relates to the field of slime water treatment, in particular to a rake-free concentration device.

Background

The treatment of coal slurry water in the washing and selecting process of coal is used as the ending link of the washing and selecting process, which is the key of the effective collection and utilization of coal slurry and the closed-circuit circulation of washing and selecting water, and the concentration device is widely used as the carrier and the key equipment of the treatment of coal slurry water, and has important significance for the closed-circuit circulation of washing and selecting water, the full utilization of underflow concentrate and environmental protection.

Along with the integration and large-scale of coal washing plants, the treatment capacity is greatly improved, the output of slime water and the content of fine mud in the slime water are also greatly increased, so that the diameter of a concentration device is continuously increased in the application process, the existing equipment has a specification reaching 45m or more, and the fine mud is more refined and the treatment capacity is increased, so that the settling time period is short, the settling effect is poor, the fine mud in washing circulating water cannot be effectively separated, the coal washing quality is seriously influenced, and therefore, two-stage concentration or even three-stage concentration is added for further purifying the washing circulating water in many coal washing plants, a large amount of land is occupied, coal-carrying foam which is not completely recovered in a flotation stage is still remained in the slime water, the waste of fine coal is caused, and the economic loss is caused.

Disclosure of Invention

In order to fully utilize the multistage sedimentation technology to realize the multistage concentration combination on the structure of the thickener, the defoaming technology is utilized to realize the recovery and utilization of clean coal on the residual mineralized foam, so that the occupied area is greatly reduced, the clean coal recovery is increased, the multistage diversified utilization of the coal slime is realized, the economic income is increased, and the waste is reduced. Therefore, the invention provides a rake-free concentrating device.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a no harrow enrichment facility, collects the subassembly including pan feeding subassembly, water conservancy diversion subassembly, clean coal, the water conservancy diversion subassembly still includes central cell body, and coal slime water is through the pan feeding subassembly, and flows to the middle part of central cell body with the top of medicament from central cell body, then to diffusion all around, and the bubble carries in the fine coal slime come-up to clean coal collects the defoaming district in the subassembly after the reaction, and coal slime water in the central cell body flows in the central cell body through defoaming back, along with lasting filling of coal slime, and the coal slime water of central cell body top overflows in the water conservancy diversion settlement district of central cell body to clean coal collection subassembly, the water conservancy diversion settlement district sets up on the lateral wall of central cell body.

The invention has the advantages that:

(1) this device realizes that traditional multistage concentrated pond is structural unites two into one, the area in traditional multistage concentrated pond that has significantly reduced.

(2) The device is characterized in that the fine coal slime at the sedimentation part of the diversion sedimentation area is overflowed by the coal slime water after the foam is removed in the foam removing area arranged in the middle of the central groove body.

(3) The separation of coarse coal slime products and fine coal slime products is realized, the coarse coal slime products can be used as the coal blending of middling coal products due to high coal content, the economic income is increased, the waste is reduced, the fine coal slime products are accumulated and discharged in a centralized manner, the pollution is reduced, the more sufficient separation of the fine coal slime and water is realized, and the washing process deterioration phenomenon caused by circulating water is greatly improved.

(4) Whether the fine mud can settle in the thickener depends mainly on the movement distance of fine particles in the vertical direction, and the arrangement of the annular groove and the turbulent flow partition plates in the settling tank can ensure that the slime water can obtain sufficient settling time in a limited space, thereby realizing the full settling of the fine mud.

(5) The bubble breaker set up can realize the desorption of fine coal on the residual mineralized bubble through the mode of pulsation hammering, and the efflux water still can realize washing and collecting of attaching the wall fine coal simultaneously.

(6) Gather magnetic shower's setting and can use magnetic particle as the kind of magnetism, strengthen the depending on of flocculating agent to the adhesion of thin mud and flocculating agent is accelerated, the settlement with higher speed of realizing thin mud, the abundant separation of further realization mud and water.

(7) The pan feeding adopts horn mouth pan feeding and dispersion guide plate to cut apart the loudspeaker discharge gate and form the multiple channel export cloth for the cloth is more even, optimizes the settlement environment.

(8) The setting of pan feeding subassembly is through drawing the interpolation that penetrates the effect and realize flocculating agent, expands suddenly through the fluid simultaneously and contracts suddenly, leads to the change of pressure differential, leads to appearing the turbulent aggravation phenomenon to realize the intensive mixing of flocculating agent and ore pulp.

Drawings

FIG. 1 is a schematic view showing the direction of flow of coal water in the present invention.

Fig. 2 is a structural diagram of the whole device when the diversion settling area is the first scheme.

Fig. 3 is a structural diagram of the whole device when the diversion settling area is the second scheme.

Fig. 4 is a structural view of a bubble extinguishing area.

Fig. 5 is a top view of the driving region structure.

Fig. 6-7 are structural diagrams of the diversion settling zone in a first embodiment.

Fig. 8-9 are structural diagrams of a second scheme of the diversion sedimentation zone.

Fig. 10 is a structural view of a second distributor and a third distributor.

The notations in the figures have the following meanings:

11-main feeding pipe 12-reducing section 13-medicament injection pipe

21-central groove body 22-central feeding pipe 23-dispersion guide plate 24-first discharging hole

25-bubble guiding plate 26-horizontal supporting rod

311-rotating bearing 312-arc-shaped poking plate 313-second impact pipe 314-jet flow driving bent plate

341-first impact tube 342-grooved roller 343-hammering foam-removing plate 344-hammering rod

346-reciprocating spring 347-clean coal collecting trough

361-second magnetic gathering injection pipe 362-second magnetic powder feeding pipe 363-second distributing device

371-ring groove 3711-second spoiler baffle 3712-second underflow discharge outlet

372-second inclined plate diversion and discharge pipe 373-second underflow discharge pipe 374-second overflow discharge pipe

381-third magnetic injection pipe 382-third magnetic powder feeding pipe 383-third distributing device

391-settling tank 3911-third baffle

392-third inclined plate flow guide and discharge pipe 393-third underflow discharge pipe 394-third overflow discharge pipe

395-connecting pipe

Detailed Description

A rake-free concentrating device comprises a feeding assembly, a flow guide assembly and a clean coal collecting assembly, wherein the clean coal collecting assembly comprises a driving area, a foam removing area and a flow guide settling area. The water conservancy diversion subassembly includes that the upper end is central cell body 21 of cylinder portion, lower extreme for funnel portion, central cell body 21 is the cavity structure, the pan feeding subassembly sets up in the cavity top of central cell body 21, the lower tip of central cell body 21 is provided with first discharge gate 24. The coarse slime is gradually settled above the first discharge port 24 of the central groove body 21 and is settled to reach a certain settlement amount, the coarse slime is discharged through the first discharge port 24, and materials discharged from the first discharge port 24 are collected and used for blending middlings or used as building materials, so that the economic income is increased.

The material and the medicament flow from the upper part of the central groove body 21 to the middle part of the central groove body 21, namely the direction a in fig. 1, then diffuse from the middle part to the periphery in the direction b, enter the funnel part of the central groove body 21, after the material and the medicament react, the coarse coal slime flows out from the first discharge hole 24, and the guide component enables the floated residual mineralized bubbles and the fine coal slime to move upwards, then the bubbles are guided to the defoaming area d through the driving area, the defoamed coal slime water overflows from the central groove body 21 to the guide settling area arranged on the outer side wall of the central groove body in the direction e, and therefore the water and the settled fine coal slime are separated. Specifically, the residual mineralized bubbles and the fine coal slime may be upward along the inner side wall of the central tank 21 and then enter the defoaming region through the driving region, or directly enter the defoaming region through the middle portion of the central tank 21.

The components are described in detail below.

1. Feeding assembly

As shown in fig. 2-3, the feeding assembly includes a main feeding pipe 11, a horizontal supporting rod 26, and a chemical injecting pipe 13.

Coal slime water is input to the one end of main pan feeding pipe 11, and the other end is as the output of pan feeding subassembly, the middle part of main pan feeding pipe 11 includes reducing section 12, and in this scheme, reducing section 12 comprises ball and pipe, forms suddenly to expand and suddenly contracts alternative calabash form.

The medicament draws penetrates pipe 13 equipartition in the department that contracts suddenly of reducing section 12 to be linked together with the pipe of department that contracts suddenly, because the velocity of flow of department that contracts suddenly can increase, draw the handing-over department formation negative pressure of pipe 13 and reducing section 12 at the medicament, consequently can draw the flocculating agent of expecting in the pipe 13 to the medicament and play fine suction effect, at the increase of the department pressure that expands suddenly, the velocity of flow slows down, turbulence intensity increases at this moment, flocculating agent and slime water obtain intensive mixing.

The opening degree of the inlet of the medicament injection pipe 13 can be controlled by a superior valve to regulate and control the inhalation amount of the medicament. The materials and the medicament are mixed by the injection of the reducer section 12.

2. Flow guide assembly

As shown in fig. 2-3, the diversion assembly includes a jet feeding pipe 22 and a dispersion diversion plate 23, an input end of the jet feeding pipe 22 is connected with an outlet end of the feeding assembly, and the dispersion diversion plate 23 diffuses the coal slime water output by the jet feeding pipe 22 to the periphery. The materials and the medicament are mixed and reacted at the funnel part of the central groove body 21, the coarse coal slime is gradually settled to the deep cone of the central groove body 21 for deposition, and a certain deposition amount is discharged through the first discharge hole 24. A foam guiding plate 25 is further arranged above the outlet of the dispersion guide plate 23, and the foam generated after the reaction carries fine coal slime to move upwards along with the foam guiding plate 25 from the outer side wall of the central groove body 21 to the clean coal collecting assembly. In this scheme, the water conservancy diversion subassembly is discharged coarse coal mud from first discharge gate 24 on the one hand, and on the other hand makes fine coal mud water upwards move to clean coal collection subassembly along inside wall all around in central cell body 21 through leading bubble board 25, makes fine coal mud and separation of water. Specifically, the bubble leading plate 25 has a spherical structure.

In order to support the upper feeding assembly and the jet feeding pipe 22, a horizontal support rod 26 is fixed on the outer side wall of the jet feeding pipe 22.

3. Clean coal collecting assembly

Clean coal collection assembly is including being located driving district, a plurality of bubble districts that extinguish, the subsidence area that corresponds with the bubble district that extinguish of bubble board 25 top in central cell body 21, dispersion guide plate 23 in the water conservancy diversion subassembly is located the below in bubble district that extinguish, a plurality of bubble districts and driving district annular setting are on the lateral wall of efflux pan feeding pipe 22 that extinguish.

3.1, driving zone

As shown in fig. 2-5, in order to drive the foams generated after the reaction to the foam extinguishing area, the driving area comprises a rotary bearing 311, an arc-shaped poking plate 312, a second impact pipe 313 and a jet flow driving bent plate 314, the foam extinguishing area comprises a clean coal collecting trough 347, and all the clean coal collecting troughs 347 and the jet flow driving bent plates 314 are alternately arranged and connected into an annular structure. The inner side of the ring structure is arranged on the central inlet pipe 22 by means of a rotary bearing 311. A branch pipe is branched from the central feeding pipe 22 to serve as a second impact pipe 313, and the second impact pipe 313 obliquely impacts jet flow to drive the bent plate 314, so that the annular structure rotates around the central feeding pipe 22. An arc-shaped shifting plate 312 is further arranged on the outer side surface of the annular structure in an annular array mode, and the other end of the arc-shaped shifting plate 312 faces the inner side wall of the central groove body 21. So that the foam is driven through the arcuate drive plate 312 into the foam-removal region.

3.2 bubble eliminating zone

As shown in fig. 2-5, the bubble-removing area includes a plurality of bubble-removing devices, which are arranged in an annular array on the outer side wall of the central feeding tube 22, so as to improve the bubble-removing effect.

As shown in fig. 4, the foam killer comprises a hammering unit and a driving unit.

The hammering unit comprises a hammering foam-removing plate 343, a clean coal collecting groove 347 and a hammering rod 344. One end of the hammering rod 344 is hinged with the outer side wall of the central feeding pipe 22, the other end of the hammering defoaming plate 343 is hinged, and the clean coal collecting groove 347 and the jet flow driving bent plate 314 form an annular structure and are arranged on the central feeding pipe 22 through a rotary bearing 311.

The driving unit comprises a first impact pipe 341, a grooved roller 342 and a reciprocating spring 346, the central feeding pipe 22 branches off to form the first impact pipe 341, and the lower end of the first impact pipe 341 is opposite to the inner wall of the clean coal collecting groove 347 on the grooved roller 342. The middle part of the hammering rod 344 is connected with the middle parts of two side rods of a bracket 348 through a reciprocating spring 346, and the grooved roller 342 is arranged on the hammering rod 344 and is connected through a rotating shaft; the hammer blow plate 343 is hammered downward and the hammer rod 344 is impacted and deflected centrally by an amount less than the compression of the reciprocating spring 346. When the material in the central feeding pipe 22 flows into the grooved roller 342 from the first impact pipe 341, the grooved roller 342 rotates at a non-uniform speed, the whole driving unit and the hammering unit increase in mass, the reciprocating spring 346 is in a compressed state, the hammering defoaming plate 343 is compressed into the clean coal collecting groove 347 until the material in the grooved roller 342 is too much, so that all the material is dumped out by the rotation of the roller, here, the hammering defoaming plate 343 is far away from the clean coal collecting groove 347 due to the energy accumulated by the reciprocating spring 346, and the hammering defoaming plate 343 beats the clean coal collecting groove 347 in a reciprocating manner by periodic motion, so that defoaming is realized. The coal slurry thrown from the first impact pipe 341 also washes the clean coal on the hammering foam-removing plate 343, so that the clean coal is discharged from the concentrate discharge opening to the clean coal collecting groove 347 and is collected.

In conclusion, the undeposited fine coal slime and mineralized foam regenerated by the residual flotation reagent and the clean coal are collected to the driving area along with the water flow; then the coal slime water is driven to a defoaming area through the driving area, and after the defoaming of the defoaming area, the coal slime water containing fine coal slime overflows from a gap on the side wall of the central groove body 21.

3.3 flow guiding settling zone

The diversion settling zone can have various schemes, which are specifically described as follows:

b3.3, first scheme of diversion settling zone

As shown in fig. 2, 6 and 7, the diversion sedimentation area comprises an annular diversion sedimentation screen and a magnetic gathering sprayer, and the annular diversion sedimentation screen is spirally arranged downwards around a central groove body 21. The coal slurry water overflowed from the gap of the central groove body 21 reaches the inlet of the annular flow guide sedimentation screen. A magnetism gathering sprayer is arranged above the overflow outlet of each foam extinguishing area.

B3.3.1 annular diversion sedimentation screen

As shown in fig. 2, 6 and 7, the annular diversion sedimentation screen comprises an annular groove 371 spirally arranged around a central groove body 21, second turbulence partition plates 3711 are sequentially arranged in the annular groove 371, a second underflow discharge outlet 3712 is arranged on a bottom plate between two adjacent second turbulence partition plates 3711, and the second turbulence partition plates 3711 increase the interference sedimentation effect of fine coal slurry. Second inclined plate diversion discharge pipes 372 are arranged below the second underflow discharge ports 3712, outlets of all the second inclined plate diversion discharge pipes 372 are converged to the second underflow discharge pipe 373, namely settled materials are discharged from the second underflow discharge pipe 373, settled water passes through a second turbulence partition plate 3711 in the annular groove 371 and then is discharged from a second overflow discharge pipe 374 arranged at the tail end of the annular groove 371, and the water is used as circulating water to enter the washing and sorting process again, so that closed cycle is realized.

B3.3.2 magnetic gathering sprayer

As shown in fig. 2, 6 and 7, the magnetism-gathering sprayer includes a second magnetism-gathering ejector 361, a second magnetic powder feeding pipe 362 and a second material distributor 363. The upper end of the second magnetic particle feeding pipe 362 is also communicated with the feeding distribution groove 11, the lower end of the second magnetic particle feeding pipe 361 is communicated with the second distributing device 363, one end of the second magnetic particle feeding pipe 362 is connected with a pipeline at a magnetic particle supply position, and the other end of the second magnetic particle feeding pipe 361 is communicated with the second magnetic particle feeding distribution groove; the outlet at the lower end of the second material distributor 363 is in a fan shape and is separated by a plurality of partition plates, so that magnetic materials collected at the outlet flow down along the side wall of the guide plate uniformly, and accelerated sedimentation of fine coal slime is realized. When the slime water passes through the annular diversion sedimentation screen, the magnetism gathering sprayer sprays magnetic seeds to obtain high-efficiency sedimentation.

C3.3, second scheme of diversion settling zone

As shown in fig. 3, fig. 8, fig. 9, the water conservancy diversion settlement zone includes the layer falls water conservancy diversion sieve and gathers the magnetic spray thrower, the layer falls water conservancy diversion sieve and falls the setting to the lower floor along central cell body 21 outer wall, and in this embodiment, the first water conservancy diversion sieve that disappears the bubble district extends to the inside wall department of central cell body 21, and the coal slime water that does not subside in first water conservancy diversion sieve department after the bubble that disappears overflows central cell body 21 to in the layer falls water conservancy diversion sieve. A magnetism gathering sprayer is arranged above the overflow outlet of each foam extinguishing area.

C3.3.1 layered descending diversion sedimentation screen

As shown in fig. 3, fig. 8 and fig. 9, the layer descending flow guiding sedimentation sieve comprises a plurality of third flow guiding sedimentation subgroups which are sequentially arranged downwards along the outer wall of the central groove body 21, each third flow guiding sedimentation subgroup comprises a sedimentation groove 391, a plurality of third turbulence partition plates 3911 are alternately arranged in the sedimentation groove 391, the third turbulence partition plates 3911 can be alternately arranged on two side plates of the sedimentation groove 391 according to the arrangement mode of a high-level plate and a low-level plate, and the third turbulence partition plates 3911 increase the interference sedimentation effect of fine coal slime.

A third underflow discharge port is arranged on the bottom plate of each settling tank 391, a third inclined plate flow guide discharge pipe 392 is arranged below each settling tank 391, fine coal slime discharged from all the third underflow discharge ports in each settling tank 391 is collected, outlets of all the third inclined plate flow guide discharge pipes 392 are collected to the third underflow discharge pipe 393, and finally, the fine coal slime after settling is discharged from the third underflow discharge pipe 393.

The part of the coal slime water which is not settled passes through all the third turbulence partition plates 3911 in each third diversion settlement sub-group, and is output to the inlet of the next third diversion settlement sub-group from the connecting pipe 395 to the third diversion settlement sub-group at the lowest part, and the water which is completely settled is output from the third overflow discharge pipe 394 at the output end of the third diversion settlement sub-group at the lowest part and is used as circulating water to enter the washing and dressing process again, so that closed cycle is realized.

C3.3.2 magnetic gathering sprayer

As shown in fig. 3, 8 and 9, the magnetism gathering sprayer comprises a third magnetism gathering injection pipe 381, a third magnetic powder feeding pipe 382 and a third distributing device 383, wherein the upper end of the third magnetism gathering injection pipe 381 is also communicated with the feeding distribution groove 11, the lower end of the third magnetism gathering injection pipe 381 is communicated with the third distributing device 383, one end of the third magnetic powder feeding pipe 382 is connected with a pipeline at a magnetic powder supply position, and the other end of the third magnetism gathering injection pipe 381 is communicated with the third magnetism gathering injection pipe 381; the outlet at the lower end of the third distributing device 383 is in a fan shape and is separated by a plurality of partition plates, so that magnetic materials are uniformly gathered at the outlet and flow down along the side wall of the guide plate, and accelerated sedimentation of fine coal slime is realized. When the slime water passes through the layer falling diversion sedimentation screen, the magnetism gathering sprayer sprays magnetic seeds to obtain high-efficiency sedimentation, and then the fine slime is fully sedimentated in the process and is separated from the water more thoroughly. In order to realize better settlement effect, in the scheme, the input ends of the third diversion settlement subgroups are respectively provided with a magnetism gathering sprayer.

As shown in fig. 10, the first distributor 353, the second distributor 363, and the third distributor 383 are all identical in structure. The multi-runner distributor is adopted, so that the distributor is more uniform, the stirring of the rakes is not needed in the working process, the rake pressing phenomenon is thoroughly solved, and the continuous and stable work of the thickener is ensured.

In summary, in the clean coal collecting assembly, the structures of the driving area and the foam-removing area and the two diversion settlement areas are combined at will to form different technical schemes.

The invention is not to be considered as limited to the specific embodiments shown and described, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims

1. The rakeless concentrating device is characterized by comprising a feeding assembly, a flow guide assembly and a clean coal collecting assembly, wherein the flow guide assembly further comprises a central groove body (21), coal slime water flows from the upper part of the central groove body (21) to the middle part of the central groove body (21) through the feeding assembly and then diffuses around, residual mineralized bubbles and fine coal slime float up to a foam removing area in the clean coal collecting assembly after reaction, the coal slime water in the central groove body (21) flows in the central groove body (21) after foam removing, and along with continuous filling of the coal slime water, the coal slime water above the central groove body (21) overflows from the central groove body (21) to a flow guide settling area in the clean coal collecting assembly, and the flow guide settling area is arranged on the outer side wall of the central groove body (21);

the foam extinguishing area comprises a foam extinguisher, the foam extinguisher comprises a hammering unit and a driving unit, the hammering unit comprises a hammering foam extinguishing plate (343), a clean coal collecting groove (347) and a hammering rod (344), one end of the hammering rod (344) is hinged with the outer side wall of the central feeding pipe (22), the other end of the hammering rod is hinged with the hammering foam extinguishing plate (343), the clean coal collecting groove (347) and the jet flow driving bent plate (314) form an annular structure and are arranged on the central feeding pipe (22) through a rotary bearing (311); the driving unit comprises a first impact pipe (341), a grooved roller (342) and a reciprocating spring (346), a branch pipe is branched from the central feeding pipe (22) to serve as the first impact pipe (341), and the lower end of the first impact pipe (341) is opposite to the inner wall of a clean coal collecting groove (347) on the grooved roller (342);

the water conservancy diversion subassembly includes central pan feeding pipe (22), dispersion guide plate (23), the input of central pan feeding pipe (22) is connected with the exit end of pan feeding subassembly, dispersion guide plate (23) are with the coal slime water of central pan feeding pipe (22) output to diffusion all around.

2. The rake-free thickening device according to claim 1, wherein the feeding assembly comprises a main feeding pipe (11), a chemical injection pipe (13); coal slime water is input to the one end of main pan feeding pipe (11), and the other end is as the output of pan feeding subassembly, the middle part of main pan feeding pipe (11) includes reducing section (12), the medicament draws and penetrates pipe (13) equipartition in the suddenly department that contracts of reducing section (12) to be linked together with suddenly department that contracts.

3. The rake-free thickening apparatus according to claim 1, wherein the flow directing assembly further comprises a bubble directing plate (25), the bubble directing plate (25) being disposed above the outlet of the dispersion flow guide plate (23).

4. The rake-free concentrating device according to claim 1, wherein the flow guiding settling zone comprises an annular flow guiding settling screen and a magnetic gathering sprayer, the annular flow guiding settling screen comprises an annular groove (371) spirally arranged around the central trough body (21), a second underflow discharge port (3712) is further arranged on the lower bottom plate of the annular groove (371), a plurality of second inclined plate flow guiding discharge pipes (372) are arranged below the second underflow discharge ports (3712), outlets of all the second inclined plate flow guiding discharge pipes (372) are converged into the second underflow discharge pipe (373), and settled water is discharged from a second overflow discharge pipe (374) arranged at the tail end of the annular groove (371).

5. The rake-free concentrating device of claim 4, wherein the annular grooves (371) are sequentially arranged with second baffle plates (3711) along the length direction.

6. The harrowing-free concentration device of claim 1, wherein the flow guiding settling zone comprises a layer descending flow guiding settling screen and a magnetic gathering sprayer, the layer descending flow guiding settling screen comprises a plurality of third flow guiding settling sub groups which are sequentially arranged downwards along the outer wall of the central tank body (21), in two adjacent settling tanks (391), a lower settling tank (391) obtains the coal slurry water flowing out of the previous settling tank (391), each third flow guiding settling sub group comprises a settling tank (391), a bottom plate of each settling tank (391) is provided with a third underflow discharge port for discharging settled fine coal slurry, and the completely settled water is output from a third overflow discharge pipe (394) at the output end of the lowest third flow settling sub group.

7. A rakeless thickening apparatus according to claim 1, wherein a third ramp flow guide and discharge conduit (392) is provided below each settling tank (391) to collect fine coal slurry discharged from all third underflow discharge openings in each settling tank (391), and wherein the fine coal slurry discharged from all third ramp flow guide and discharge conduits (392) is collected to be discharged from the third underflow discharge conduit (393).

8. The harrow-free concentrating device of any one of claims 4-6, wherein the magnetism-gathering sprayer comprises a magnetism-gathering ejector pipe, a magnetic powder feeding pipe and a distributing device, the upper end of the magnetism-gathering ejector pipe is communicated with a central feeding pipe (22) in the flow guide assembly, the lower end of the magnetism-gathering ejector pipe is communicated with the distributing device, one end of the magnetic powder feeding pipe is connected with a pipeline at a magnetic powder supply position, and the other end of the magnetic powder feeding pipe is communicated with the magnetism-gathering ejector pipe.