A pilot flotation column and pilot platform system for coal slime flotation

Abstract

The present invention relates to the technical field of coal slime flotation, and proposes a pilot flotation column and a medium-sized platform system for coal slime flotation. The flotation column includes a flotation outer cylinder, a concentrate overflow tank, and an inner cylinder. The distributor is arranged above the flotation outer cylinder, and has a distribution inlet and a plurality of distribution outlets arranged circumferentially, a distribution pipe, and each distribution outlet is connected to a distribution pipe, which extends into and passes through the first cylinder cavity and its lower end extends into the second cylinder cavity. An aeration component is arranged on the distribution pipe, an air intake plate is arranged above the flotation outer cylinder, and is connected to the aeration component. A bubble pushing mechanism is arranged above the flotation outer cylinder, and its lower end extends into the upper part of the first cylinder cavity. Through the above technical scheme, the technical problem that there is a certain probability of foam accumulation when the flotation column is flotated in the related technology, and a foam dead zone is generated in severe cases, resulting in a significant impact on the concentrate collection efficiency and flotation efficiency is solved.

Description

Technical Field

[0001] The invention relates to the technical field of coal slime flotation, and in particular to a coal slime flotation pilot flotation column and a pilot platform system. Background Art

[0002] Flotation refers to the beneficiation process of floating solid minerals from a water suspension (ore pulp) based on the differences in the physical and chemical properties of the mineral surface. Surfactants-foaming agents that can generate a large number of bubbles are usually used. When air is introduced into the water or air enters the water due to the agitation of the water, the hydrophobic end of the surfactant is oriented toward the air side of the bubble at the gas-liquid interface, and the hydrophilic end remains in the solution, forming bubbles; another surfactant that acts as a capture agent is adsorbed on the surface of the solid mineral powder. This adsorption has a certain selectivity depending on the properties of the mineral. Its basic principle is to use the lattice defects on the crystal surface, and the outward hydrophobic end is partially inserted into the bubble, so that during the flotation process, the bubble may take away the specified mineral powder to achieve the purpose of mineral separation.

[0003] Coal washing is also an important part of improving coal quality. Coal washing can remove impurities from coal, reduce ash and sulfur content, and is the premise of clean coal technology. However, a certain amount of coal slime will be produced during the coal washing process. Improper disposal of these coal slimes will cause environmental pollution and waste of resources. Coal washing is usually achieved through flotation. Flotation is a physical and chemical method that uses surface property differences to separate coal slimes. It is a widely used and effective method for separating and recovering clean coal for coal slimes with a particle size of less than 0.5 mm. Mechanical flotation and microbubble flotation are two effective flotation methods. Commonly used equipment and methods for microbubble flotation are flotation columns, aerated flotation machines that aerate and stir the slurry, and types such as microbubble countercurrent flotation columns and microbubble jet flotation columns. When the flotation column is flotating, the discharge of the concentrate is the last link to achieve flotation separation. The flotation column usually adopts the overflow method. When flotation is carried out in the flotation barrel of the flotation column, from top to bottom are the foam area, the flotation layer (stratosphere), and the storage layer. For the foam layer, although there will be continuous microbubbles floating in the foam area to drive the foam area to overflow to achieve concentrate discharge, the foam layer has a large surface tension and there is a certain probability of foam accumulation. In severe cases, a foam dead zone will be generated, resulting in a significant impact on the concentrate collection efficiency and flotation efficiency. Summary of the invention

[0004] The present invention provides a coal slime flotation pilot flotation column and a pilot platform system, which solve the above technical problems in the related art.

[0005] The technical solution of the present invention is as follows:

[0006] A coal slime flotation pilot flotation column, comprising a flotation column, the flotation column comprising

[0007] The flotation outer cylinder has a first cylinder cavity inside and an outer cylinder cone section at the bottom.

[0008] A concentrate overflow trough is arranged around the top of the flotation outer cylinder.

[0009] The inner cylinder is arranged below the middle position in the flotation outer cylinder, the upper part of the inner cylinder has a second cylinder cavity, the bottom has an inner cylinder cone section, the second cylinder cavity is connected with the first cylinder cavity, wherein an annular cavity is formed between the flotation outer cylinder and the inner cylinder, the annular cavity is divided into an annular cylinder cavity and an annular cone cavity from top to bottom, the bottom of the annular cone cavity has a tailings outlet, the upper part of the annular cylinder cavity is a tailings inlet, the tailings inlet is connected with the first cylinder cavity,

[0010] a tailings pipe, the tailings pipe being connected to the tailings outlet,

[0011] The distributor is arranged above the flotation outer cylinder and has a distribution inlet and a plurality of distribution outlets arranged circumferentially.

[0012] A circulating material pipe, one end of which is connected to the bottom of the inner barrel cone section, and the other end of which is connected to the distribution inlet.

[0013] A material distribution pipe, each of the distribution outlets is connected to a material distribution pipe, the material distribution pipe extends into and passes through the first barrel cavity and its lower end extends into the second barrel cavity,

[0014] Aeration assembly, arranged on the material distribution pipe,

[0015] The air inlet plate is arranged above the flotation outer cylinder and is connected to the aeration assembly.

[0016] The bubble pushing mechanism is arranged above the flotation outer cylinder, and the lower end of the mechanism extends into the upper part of the first cylinder cavity.

[0017] As a further technical solution, the air intake plate has an air intake cavity inside, the air intake cavity is connected to the air filling assembly, and the air intake cavity has a plurality of air intake ports arranged in a matrix.

[0018] The bubble pushing mechanism comprises

[0019] A swinging member, wherein the swinging member is swingably arranged above the flotation outer cylinder,

[0020] A first bubble pushing plate is arranged on the swinging member and is located at one side of the air inlet plate.

[0021] As a further technical solution, the air inlet faces the first bubble pushing plate, and the first bubble pushing plate is vertical after swinging to rest without being acted upon by external force, and the air inlet plate is tilted relative to the first bubble pushing plate.

[0022] As a further technical solution, the bubble pushing mechanism also includes

[0023] A sealing baffle plate, wherein the sealing baffle plate is arranged on the first bubble pushing plate or on the air inlet plate, and the sealing baffle plates are arranged on both sides of the first bubble pushing plate, and an air suction space is formed between the two sealing baffle plates, the first bubble pushing plate and the air inlet plate. Under the suction force of the air inlet, the first bubble pushing plate approaches the air inlet plate, so that the air suction space is reduced, and under the action of gravity of the first bubble pushing plate, it moves away from the air inlet plate, so that the air suction space is increased, thereby realizing the swinging bubble pushing of the first bubble pushing plate.

[0024] As a further technical solution, the bottom of the first bubble pushing plate has an air leakage port, and the air leakage port is communicated with the air suction space and the external space.

[0025] As a further technical solution, the bubble pushing mechanism also includes

[0026] The auxiliary plate body is arranged on the swinging member, and the auxiliary plate body and the first bubble pushing plate are located on one side of the air inlet plate.

[0027] As a further technical solution, the bottom of the first bubble pushing plate has a plurality of strip-shaped gaps.

[0028] The present invention also provides a coal slime flotation pilot platform system, including the flotation column, wherein the flotation column specifically includes a first-stage flotation column, a second-stage flotation column, and a third-stage flotation column, and further includes

[0029] Feeding barrel,

[0030] A slurry mixer is connected to the feeding barrel.

[0031] The slurry cylinder has a No. 1 pool, a No. 2 pool, a No. 3 pool and a No. 4 pool, the overflow of the slurry regulator flows to the No. 1 pool, the No. 1 pool leads to the first stage flotation column, the tailings outlet of the first stage flotation column leads to the No. 2 pool, the No. 2 pool leads to the second stage flotation column, the tailings outlet of the second stage flotation column leads to the No. 3 pool, the No. 3 pool leads to the third stage flotation column, and the tailings outlet of the third stage flotation column leads to the No. 4 pool,

[0032] A concentrate tank, wherein the concentrate overflow tanks of the first-stage flotation column, the second-stage flotation column and the third-stage flotation column all lead to the concentrate tank.

[0033] As a further technical solution, it also includes

[0034] a filter press, the concentrate tank leading to the filter press,

[0035] A belt conveyor, to which the filter cake of the filter press passes, and the filter cake is transported away.

[0036] A circulating water pool, into which the filtrate of the filter press flows.

[0037] As a further technical solution, it also includes

[0038] A mechanical flotation unit, wherein the feed cylinder also leads to the mechanical flotation unit, the flotation concentrate of the mechanical flotation unit leads to the concentrate tank or the flotation column, and the tailings lead to the No. 4 pool,

[0039] The mobile platform has walking wheels, and the first-stage flotation column, the second-stage flotation column, the third-stage flotation column, the feeding cylinder, the slurry mixer, the slurry cylinder, the concentrate tank, the filter press, and the belt conveyor are all arranged on the mobile platform.

[0040] A control console is arranged on the mobile platform.

[0041] The metering doser is connected to the first stage flotation column, the second stage flotation column, the third stage flotation column, and the mechanical flotation unit.

[0042] The working principle and beneficial effects of the present invention are:

[0043] The present invention solves the problem of slow flow and dead zone in the upper foam area of ​​the flotation column when washing coal, and designs a bubble pushing mechanism that can push the foam area back and forth, thereby effectively avoiding the problem of slow bubble flow and thus avoiding the generation of dead zones. The swing of the bubble pushing mechanism is driven by the suction generated by the aeration component, and no additional power is required, thereby achieving a good driving effect and saving energy. The aeration component is connected to an air intake plate, and the air intake plate enables the negative pressure generated when the circulating slurry is aerated by the aeration component to be effectively utilized, thereby achieving the goal of attracting the bubbles of the bubble pushing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] Figure 1 A schematic diagram of the three-dimensional structure of the flotation column of the present invention from one perspective;

[0046] Figure 2 It is another perspective structural schematic diagram of the flotation column in the present invention;

[0047] Figure 3 It is a schematic diagram of the internal structure of the flotation column in the present invention;

[0048] Figure 4 for Figure 3 Middle A is a schematic diagram of a partially enlarged structure;

[0049] Figure 5 It is a schematic diagram of the side view structure of the flotation column in the present invention;

[0050] Figure 6 for Figure 5 AA cross-sectional structure diagram;

[0051] Figure 7 It is a schematic diagram of the structure of the present invention;

[0052] In the figure: flotation column 1, flotation outer cylinder 101, first cylinder cavity 102, outer cylinder cone section 103, concentrate overflow trough 104, inner cylinder 105, second cylinder cavity 106, inner cylinder cone section 107, annular cylinder cavity 108, annular cone cavity 109, tailings outlet 110, tailings inlet 111, tailings pipe 112, distributor 113, distribution inlet 114, distribution outlet 115, circulation pipe 116, distribution pipe 117, aeration assembly 118, air inlet plate 119, push bubble mechanism 120, air inlet cavity 121, air inlet 122, swing member 12 0-1, first bubble pushing plate-120-2, sealing plate-120-3, air suction space-120-4, air leakage port-120-5, auxiliary plate body-120-6, strip gap-120-7, first stage flotation column-1-1, second stage flotation column-1-2, third stage flotation column-1-3, feeding barrel-2, slurry mixer-3, slurry barrel-4, No. 1 pool-401, No. 2 pool-402, No. 3 pool-403, No. 4 pool-404, concentrate trough-5, filter press-6, belt conveyor-7, mechanical flotation unit-9, mobile platform-10, walking wheel-10-1, control console-11, metering doser-12. DETAILED DESCRIPTION

[0053] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] like Figure 1 to Figure 7 As shown, this embodiment proposes a flotation column for coal slime flotation pilot, including a flotation column 1, the flotation column 1 includes

[0055] The flotation outer cylinder 101 has a first cylinder cavity 102 inside and an outer cylinder cone section 103 at the bottom.

[0056] The concentrate overflow trough 104 is arranged around the top of the flotation outer cylinder 101.

[0057] The inner cylinder 105 is arranged below the middle position of the flotation outer cylinder 101. The upper part of the inner cylinder 105 is provided with a second cylinder cavity 106, and the bottom is provided with an inner cylinder cone section 107. The second cylinder cavity 106 is communicated with the first cylinder cavity 102. An annular cavity is formed between the flotation outer cylinder 101 and the inner cylinder 105. The annular cavity is divided into an annular cylinder cavity 108 and an annular cone cavity 109 from top to bottom. The bottom of the annular cone cavity 109 is provided with a tailings outlet 110. The upper part of the annular cylinder cavity 108 is a tailings inlet 111. The tailings inlet 111 is communicated with the first cylinder cavity 102.

[0058] The tailings pipe 112 is connected to the tailings outlet 110.

[0059] The distributor 113 is arranged above the flotation outer cylinder 101 and has a distribution inlet 114 and a plurality of distribution outlets 115 arranged circumferentially.

[0060] The circulating material pipe 116 has one end connected to the bottom of the inner barrel cone section 107 and the other end connected to the distribution inlet 114.

[0061] A material distribution pipe 117 is connected to each distribution outlet 115. The material distribution pipe 117 extends into and passes through the first barrel cavity 102 and its lower end extends into the second barrel cavity 106.

[0062] The aeration assembly 118 is arranged on the material distribution pipe 117.

[0063] The air inlet plate 119 is arranged above the flotation outer cylinder 101 and communicates with the aeration assembly 118.

[0064] The bubble pushing mechanism 120 is arranged above the flotation outer cylinder 101 , and its lower end extends into the upper part of the first cylinder cavity 102 .

[0065] In this embodiment, the flotation outer cylinder 101 is the main pulp cylinder, and the first cylinder cavity 102 therein is used to accommodate the pulp. When flotation is carried out, the interior is divided into a foam area, a flotation layer stratosphere, and a storage layer from top to bottom. The bottom is an outer cylinder cone section 103 for discharging tailings; the concentrate overflow trough 104 is arranged around the top of the flotation outer cylinder 101, which is used to overflow the concentrate. The inner cylinder 105 is installed in the flotation outer cylinder 101. On the one hand, an annular cylinder cavity 108 and an annular cone cavity 109 can be formed, so that the tailings are discharged at the surrounding positions to avoid the tailings and the pulp from mixing together and the removal effect is poor. In addition, a grid and a conical guide plate can also be installed in the inner cylinder 105. , thereby avoiding the slurry from falling and being brought in. These existing structures will not be introduced in detail; a circulating material pipe 116 is connected to the bottom of the inner cylinder cone section 107 to realize the slurry coming out from the bottom and then being sent in from the top for circulating aeration; a circulating pump can be set on the circulating material pipe 116 to realize the circulation of the slurry, and a distributor 113 is connected to the upper end of the circulating material pipe 116 to distribute the slurry to different distribution pipes 117 to realize the circulating aeration of multiple distribution pipes 117. A gasification component 118 is installed on the distribution pipe 117. The gasification component 118 in the prior art can be selected, such as a Venturi gasification mechanism using the Venturi effect. A specific implementation method is introduced in the relevant flotation column.

[0066] During flotation, the slurry is first fed into the flotation outer cylinder 101 so that the slurry is close to the lower position of the foam area layer. Subsequently, the circulation pump on the circulation pipe 116 is turned on to distribute the circulation pipe 116 to the distribution pipe 117 through the distributor 113, and aeration is performed through the aeration component 118 thereon to realize foaming flotation, wherein the slurry needs to be added with a foaming agent.

[0067] In this embodiment, taking into account the problems of slow flow and dead zones in the upper foam area of ​​the flotation column 1 in the prior art when washing coal, a bubble pushing mechanism 120 is specially designed to push the foam area back and forth, thereby effectively avoiding the problem of slow bubble flow and thus avoiding the generation of dead zones. The swing of the bubble pushing mechanism 120 is driven by the suction force generated by the aeration component 118, without the need for additional power, thus achieving a good driving effect and saving energy. The aeration component 118 is connected to an air intake plate 119, specifically, the air intake plate 119 enables the negative pressure generated when the circulating slurry is aerated by the aeration component 118 to be effectively utilized, thereby achieving the goal of attracting the bubble pushing mechanism 120 to push bubbles.

[0068] Furthermore, the air intake plate 119 has an air intake cavity 121 inside, the air intake cavity 121 is connected to the gas filling assembly 118, and the air intake cavity 121 has a plurality of air intake ports 122 arranged in a matrix.

[0069] The bubble pushing mechanism 120 includes a swinging member 120 - 1 which is swingably arranged above the flotation outer cylinder 101 , and a first bubble pushing plate 120 - 2 which is arranged on the swinging member 120 - 1 and located on one side of the air inlet plate 119 .

[0070] Furthermore, the air inlet 122 faces the first bubble pushing plate 120 - 2 , and the first bubble pushing plate 120 - 2 is vertical after being swung to rest without being acted upon by external forces, and the air inlet plate 119 is tilted relative to the first bubble pushing plate 120 - 2 .

[0071] In this embodiment, considering that the bubble pushing mechanism 120 can better push the uppermost foam area, a swinging swinging member 120-1 is designed, and the first bubble pushing plate 120-2 on the swinging member 120-1 can swing so as to push the foam back and forth regularly. The advantage is that the regular movement of the foam can be achieved. Compared with unidirectional blowing, the generation of foam static and accumulation can be better achieved, and dead zones will no longer appear; the reciprocating movement of the first bubble pushing plate 120-2 is achieved by suction of the air intake plate 119, and the air intake plate 119 has an air inlet 122. The air inlet 122 serves as an air intake and will continuously generate suction; the suction generated by the air inlet 122 is achieved by utilizing the Venturi effect in the aeration component 118, and the negative pressure suction is a by-product effect generated when the slurry is aerated. This negative pressure suction is used to cause the air inlet plate 119 to suck the first bubble pushing plate 120-2, thereby pushing the foam area. The first bubble pushing plate 120-2 is initially in a vertical state, and will swing under the action of suction. After swinging to a certain angle, because the first bubble pushing plate 120-2 itself has gravity, the torque effect of the gravity of the first bubble pushing plate 120-2 will be greater than the torque effect of the suction of the air inlet 122 on the first bubble pushing plate 120-2, and the first bubble pushing plate 120-2 will swing back. Subsequently, when the gravity torque gradually decreases, the suction of the air inlet 122 on the first bubble pushing plate 120-2 will play a major role, thereby attracting the first bubble pushing plate 120-2, and the above process will be repeated, so that the first bubble pushing plate 120-2 can push the foam area back and forth to ensure that the foam will not stand still and accumulate.

[0072] It should be noted that the first bubble pushing plate 120-2 can be made of suitable materials and has a suitable weight, so that when the air inlet 122 of the air inlet plate 119 applies suction to it, the suction is appropriate, and the first bubble pushing plate 120-2 will not be unable to move back due to excessive suction, nor will the first bubble pushing plate 120-2 be unable to be attracted due to excessive suction.

[0073] Furthermore, the bubble pushing mechanism 120 also includes

[0074] The sealing baffle plate 120-3 is arranged on the first bubble pushing plate 120-2 or on the air intake plate 119. There are sealing baffle plates 120-3 on both sides of the first bubble pushing plate 120-2. An air suction space 120-4 is formed between the two sealing baffle plates 120-3, the first bubble pushing plate 120-2 and the air intake plate 119. Under the suction force of the air inlet 122, the first bubble pushing plate 120-2 approaches the air intake plate 119, so that the air suction space 120-4 is reduced, and under the action of gravity of the first bubble pushing plate 120-2, it moves away from the air intake plate 119, so that the air suction space 120-4 is increased, thereby realizing the swinging bubble pushing of the first bubble pushing plate 120-2.

[0075] Furthermore, the first bubble pushing plate 120 - 2 has an air leakage port 120 - 5 at the bottom thereof, and the air leakage port 120 - 5 is communicated with the air suction space 120 - 4 and with the external space.

[0076] In this embodiment, in order to realize the suction effect of the air inlet 122 toward the first bubble pushing plate 120-2, a larger suction effect can be realized, and a sealing plate 120-3 is designed. The suction space 120-4 formed between them can make the suction effect better act on the first bubble pushing plate 120-2, so that the swinging process is more stable and the pushing of the foam is more appropriate. Although the suction space 120-4 is not a closed space, it can well enhance the suction effect, and in order to avoid excessive suction, a leaking port 120-5 is also set at the bottom of the first bubble pushing plate 120-2, so that the moment of suction acting on the first bubble pushing plate 120-2 and the moment of gravity of the first bubble pushing plate 120-2 can be better balanced. The leaking port 120-5 should be kept misaligned with the air inlet 122 to avoid the first bubble pushing plate 120-2 being unable to be sucked.

[0077] Furthermore, the bubble pushing mechanism 120 also includes

[0078] The auxiliary plate body 120 - 6 is disposed on the swinging member 120 - 1 , and the auxiliary plate body 120 - 6 and the first bubble pushing plate 120 - 2 are located on one side of the air inlet plate 119 .

[0079] In this embodiment, in order to achieve more stable swing of the swing member 120-1 and the first bubble pushing plate 120-2 as a whole,

[0080] An auxiliary plate 120-6 is also installed on the swinging member 120-1, which can serve as a balance, so that the swing of the first bubble pushing plate 120-2 is more stable and the bubble pushing effect will not be affected by the change of the force in the foam area.

[0081] Furthermore, the bottom of the first bubble pushing plate 120 - 2 has a plurality of strip-shaped gaps 120 - 7 .

[0082] In this embodiment, in order to avoid a relatively large adsorption effect between the foam in the foam area and the first bubble pushing plate 120-2, a plurality of strip gaps 120-7 are provided at the bottom thereof so that the first bubble pushing plate 120-2 will not be excessively affected by the surface tension of the foam, and the foam can partially pass through the strip gaps, thereby achieving better pushing.

[0083] This embodiment also provides a coal slime flotation pilot platform system, such as Figure 7 As shown, the flotation column 1 specifically comprises a first-stage flotation column 1-1, a second-stage flotation column 1-2, and a third-stage flotation column 1-3, and further comprises

[0084] Feeding barrel 2,

[0085] The slurry mixer 3 is connected to the feeding barrel 2.

[0086] The slurry cylinder 4 has a No. 1 pool 401, a No. 2 pool 402, a No. 3 pool 403, and a No. 4 pool 404. The overflow of the slurry mixer 3 flows to the No. 1 pool 401, the No. 1 pool 401 leads to the first stage flotation column 1-1, the tailings outlet 110 of the first stage flotation column 1-1 leads to the No. 2 pool 402, the No. 2 pool 402 leads to the second stage flotation column 1-2, the tailings outlet 110 of the second stage flotation column 1-2 leads to the No. 3 pool 403, the No. 3 pool 403 leads to the third stage flotation column 1-3, and the tailings outlet 110 of the third stage flotation column 1-3 leads to the No. 4 pool 404.

[0087] The concentrate tank 5 , the concentrate overflow tanks 104 of the first stage flotation column 1 - 1 , the second stage flotation column 1 - 2 , and the third stage flotation column 1 - 3 all lead to the concentrate tank 5 .

[0088] Furthermore, it also includes

[0089] Filter press 6, concentrate tank 5 leads to filter press 6,

[0090] The filter cake from the filter press 6 is conveyed to the belt conveyor 7, which transports the filter cake away.

[0091] Circulating water tank, the filtrate of filter press 6 leads to the circulating water tank.

[0092] Furthermore, it also includes

[0093] The feed cylinder 2 of the mechanical flotation unit 9 also leads to the mechanical flotation unit 9. The flotation concentrate of the mechanical flotation unit 9 leads to the concentrate tank 5 or the flotation column 1, and the tailings lead to the fourth pool 404.

[0094] The mobile platform 10 has a travel wheel 10-1. The first stage flotation column 1-1, the second stage flotation column 1-2, the third stage flotation column 1-3, the feed cylinder 2, the slurry mixer 3, the slurry cylinder 4, the concentrate tank 5, the filter press 6, and the belt conveyor 7 are all arranged on the mobile platform 10.

[0095] The control console 11 is arranged on the mobile platform 10.

[0096] The metering doser 12 leads to the first flotation column 1 - 1 , the second flotation column 1 - 2 , the third flotation column 1 - 3 , and leads to the mechanical flotation unit 9 .

[0097] In this embodiment, the load capacity of the mobile platform 10 can be designed to be 30t to 35t; the upper end is a rectangular plane made of 304 stainless steel, and the length, width and thickness of the rectangular plane are 12 meters, 2.5 meters and 0.05 meters respectively; a support foot is arranged under each of the four corners of the rectangular plane, and the support foot is a cylindrical steel pipe with an inner diameter of 0.15m, a thickness of 0.05m and an effective height of 0.5m.

[0098] The mechanical flotation unit 9 is preferably an integrated multi-tank mechanical agitation flotation device, preferably an integrated 8-tank to 11-tank mechanical agitation flotation device, and further preferably an integrated tank mechanical agitation flotation device. The mechanical flotation unit 9 is placed in parallel with multiple flotation columns 1, and the feed barrel 2 leads to the mechanical flotation unit 9 on the one hand, and leads to a first flotation column 1-1 on the other hand; the concentrate tank 5 can obtain concentrate through the mechanical flotation unit 9 on the one hand, and can obtain concentrate through a first flotation column 1-1, a second flotation column 1-2, and a third flotation column 1-3 on the other hand; the two methods can be selected according to the needs, according to the different requirements of the processing volume and processing performance, and can also be flotation processed simultaneously to achieve the required processing requirements.

[0099] The metering doser 12 can be connected to the first flotation column 1-1, the second flotation column 1-2, the third flotation column 1-3, and the mechanical flotation unit 9, so as to meet the required dosing process. The working pressure of the first flotation column 1-1, the second flotation column 1-2, and the third flotation column 1-3 can be 0.16MPa to 0.18MPa, and the particle size is 0.5 micron to 5 microns.

[0100] When the flotation column 1 is used for flotation, the slurry is first fed into the barrel 2, then into the slurry mixer 3, and finally into the No. 1 pool 401 of the slurry barrel 4. The concentrates flotated by the first-stage flotation column 1-1, the second-stage flotation column 1-2, and the third-stage flotation column 1-3 can be respectively entered into the concentrate tank 5 through pipelines for dehydration; wherein, the flotation tailings of the first-stage flotation column 1-1 can enter the No. 2 pool 402 of the slurry barrel 4 through a pipeline, and can enter the second-stage flotation column 1-2 through a pipeline after stirring and adjustment, and the flotation tailings after flotation by the second-stage flotation column 1-2 can respectively enter the No. 3 pool 403 of the slurry barrel 4 through a pipeline, and can enter the third-stage flotation column 1-3 through a pipeline for flotation after stirring and adjustment, and the flotation tailings are sent to the No. 4 pool 404, and finally discharged into the tailings treatment unit of the coal washing plant through a pipeline.

[0101] In this embodiment, the inconvenience of the coal washing plant first having to send the coal sample to the flotation manufacturer for laboratory flotation test to detect the parameters required for flotation before building the flotation system is well solved. The pilot platform flotation can realize the real-time flotation test of coal slime on the spot, provide support for the acquisition of flotation-related experimental data for engineering design, avoid the impact of flotation experimental data such as the inevitable loss of moisture and pollution of coal samples during mailing and transportation, and thus will not affect the engineering design, and avoid the failure of the engineering system to start up when the data is seriously affected; solve the problem that different flotation methods are suitable for different coal qualities and it is difficult to verify through subsequent pilot tests. This coal slime flotation pilot platform system is mobile, convenient for mechanical flotation and microbubble flotation to be carried out simultaneously or in series, and can obtain reliable data on the site of the coal preparation plant. It is of great significance.

[0102] Pilot test 1

[0103] The coal sludge water of a coal washing plant has a concentration of 75g / L. It flows into the slurry tube 4 of the coal sludge flotation pilot platform system through the pipeline. After being stirred and homogenized, it flows into the slurry mixer 3 by gravity. After being fully contacted with the flotation reagent added by the metering doser 12 for 4 minutes under the stirring state, it enters the mechanical flotation unit 9 through the pipeline for mechanical flotation. The mechanical flotation unit 9 is a continuous 9-slot flotation machine. The effective residence time of the slurry in each slot is 6 minutes. The metering dosing devices 2-3 respectively add slurry to the mechanical flotation unit 9. Flotation reagents are added to the 1st and 5th tanks, and the flotation concentrate enters the concentrate tank 5 through the outlet pipeline of the 9th tank for temporary storage, and is then sent to the filter press 6 for dehydration through the slurry pump and pipeline. The feed pressure of the filter press 6 is 0.71MPa, the feeding time is 2min, and the pressing operation time is 8min. After dehydration, the clean coal filter cake is obtained. The ash content, total moisture content and calorific value of the clean coal filter cake are 11.65%, 24.6% and 4894kcal / kg respectively.

[0104] Pilot test 2

[0105] The coal sludge water of a coal washing plant has a concentration of 80g / L. It flows into the slurry tube 4 of the coal sludge flotation pilot platform system through the pipeline. After being stirred and homogenized, it flows into the slurry mixer 3 by gravity. After being fully contacted with the flotation reagent added by the metering doser 12 for 4.5 minutes under stirring, it enters the mechanical flotation unit 9 through the pipeline for mechanical flotation. The mechanical flotation unit 9 is a continuous 9-slot flotation machine. The effective residence time of the slurry in each slot is 6.5 minutes. The metering doser 12 respectively feeds the mechanical flotation machine Flotation reagents are added to the 1st and 5th tanks of group 9. The flotation concentrate enters the concentrate barrel 3-7 through the outlet pipeline of the 9th tank for temporary storage, and is then sent to the filter press 6 for dehydration through a slurry pump and a pipeline. The feed pressure of the filter press 6 is 0.72MPa, the feeding time is 2min, and the pressing operation time is 8min. After dehydration, a clean coal filter cake is obtained. The ash content, total moisture content and calorific value of the clean coal filter cake are 22.15%, 26.0% and 3957kcal / kg respectively. In this case, it is necessary to close the pipeline from the flotation concentrate outlet of the 9th tank of the mechanical flotation unit 9 to the concentrate tank 5, switch the flotation concentrate to flow through the pipeline into the second-stage flotation column 1-2 for micro-nano bubble flotation. The micro-nano bubble working pressure is 0.17MPa, and the flotation operation time is 4.5min. The flotation concentrate enters the concentrate tank 5 through the pipeline for dehydration, and the flotation tailings enter the No. 3 pool 403 of the pulp tube 4 and enter the third-stage flotation column 1-3 after adjustment for micro-nano bubble flotation. The micro-nano bubble working pressure is 0.1 75MPa, the flotation operation time is 2.5min, the flotation concentrate enters the concentrate tank 5 through the pipeline and is evenly mixed with the flotation concentrate produced by the second-stage flotation column 1-2, and then is sent to the filter press 6 for dehydration through the slurry pump and the pipeline. The feed pressure of the filter press 6 is 0.73MPa, the feeding time is 3min, and the pressing operation time is 9min. After dehydration, the clean coal filter cake is obtained. The ash content, total moisture content and calorific value of the clean coal filter cake are 11.50%, 25.5% and 4958kcal / kg respectively.

[0106] Pilot test three

[0107] The coal sludge water of a power coal washing plant has a concentration of 85g / L. It flows into the slurry tube 4 of the coal sludge flotation pilot platform system through the pipeline. After being stirred and homogenized, it flows into the slurry mixer 3 by gravity. After being fully contacted with the flotation reagent added by the metering doser 12 for 4 minutes under the stirring state, it enters the first flotation column 1-1 through the pipeline for micro-nano bubble flotation. Under the action of the micro-nano bubbles with a working pressure of 0.18MPa and the reagent added by the metering doser 12, the flotation concentrate is flowed into the concentrate tank 5 through the pipeline for dehydration. The flotation tailings enter the slurry tube 4 and enter the third flotation column 1 after adjustment. -3 for micro-nano bubble flotation, the micro-nano bubble working pressure is 0.18MPa, the flotation operation time is 3min, the flotation concentrate enters the concentrate tank 5 through the pipeline and is evenly mixed with the flotation concentrate produced by the first flotation column 1-1, and then is sent to the filter press 6 for dehydration through the slurry pump and the pipeline. The feed pressure of the filter press 6 is 0.74MPa, the feeding time is 3min, and the pressing operation time is 9.5min. After dehydration, the clean coal filter cake is obtained. The ash content, total moisture content and calorific value of the clean coal filter cake are 11.88%, 24.9% and calorific value are 4793kcal / kg respectively.

[0108] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pilot flotation column for coal slime flotation, It is characterized in that It comprises a flotation column (1), wherein the flotation column (1) comprises A flotation outer cylinder (101), wherein the flotation outer cylinder (101) has a first cylinder cavity (102) inside and an outer cylinder cone section (103) at the bottom. A concentrate overflow trough (104), wherein the concentrate overflow trough (104) is arranged around the top of the flotation outer cylinder (101), An inner cylinder (105), the inner cylinder (105) being arranged below the middle position in the flotation outer cylinder (101), the inner cylinder (105) having a second cylinder cavity (106) at the upper part and an inner cylinder cone section (107) at the bottom, the second cylinder cavity (106) being communicated with the first cylinder cavity (102), wherein an annular cavity is formed between the flotation outer cylinder (101) and the inner cylinder (105), the annular cavity being divided into an annular cylinder cavity (108) and an annular cone cavity (109) from top to bottom, the annular cone cavity (109) having a tailings outlet (110) at the bottom, the annular cylinder cavity (108) having a tailings inlet (111) at the upper part, the tailings inlet (111) being communicated with the first cylinder cavity (102), a tailings pipe (112), the tailings pipe (112) being in communication with the tailings outlet (110), The distributor (113) is arranged above the flotation outer cylinder (101) and has a distribution inlet (114) and a plurality of distribution outlets (115) arranged circumferentially. A circulating material pipe (116) is connected at one end to the bottom of the inner cylinder cone section (107) and at the other end to the distribution inlet (114). a material distribution pipe (117), each of the distribution outlets (115) being connected to a material distribution pipe (117), the material distribution pipe (117) extending into and passing through the first barrel cavity (102) and having a lower end extending into the second barrel cavity (106), The gas filling assembly (118) is arranged on the material distribution pipe (117). An air inlet plate (119) is disposed above the flotation outer cylinder (101) and is in communication with the aeration assembly (118). The bubble pushing mechanism (120) is arranged above the flotation outer cylinder (101), with its lower end extending into the upper part of the first cylinder cavity (102). The air intake plate (119) has an air intake cavity (121) inside, the air intake cavity (121) is in communication with the air filling assembly (118), and the air intake cavity (121) has a plurality of air intake ports (122) arranged in a matrix. The bubble pushing mechanism (120) comprises A swinging member (120-1), wherein the swinging member (120-1) is swingably disposed above the flotation outer cylinder (101), A first bubble pushing plate (120-2), wherein the first bubble pushing plate (120-2) is arranged on the swinging member (120-1) and is located on one side of the air inlet plate (119).

2. A coal slime flotation pilot flotation column according to claim 1, It is characterized in that The air inlet (122) faces the first bubble pushing plate (120-2), and the first bubble pushing plate (120-2) is vertical after swinging to rest without being acted upon by external forces, and the air inlet plate (119) is arranged obliquely relative to the first bubble pushing plate (120-2).

3. A coal slime flotation pilot flotation column according to claim 2, It is characterized in that The bubble pushing mechanism (120) further includes A sealing plate (120-3), wherein the sealing plate (120-3) is arranged on the first bubble pushing plate (120-2) or on the air inlet plate (119), and the sealing plates (120-3) are provided on both sides of the first bubble pushing plate (120-2), and an air suction space (120-4) is formed between the two sealing plates (120-3), the first bubble pushing plate (120-2), and the air inlet plate (119); under the suction force of the air inlet (122), the first bubble pushing plate (120-2) approaches the air inlet plate (119), thereby reducing the air suction space (120-4); and under the gravity of the first bubble pushing plate (120-2), it moves away from the air inlet plate (119), thereby increasing the air suction space (120-4), thereby realizing the swinging of the first bubble pushing plate (120-2) to push bubbles.

4. A coal slime flotation pilot flotation column according to claim 3, It is characterized in that The bottom of the first bubble pushing plate (120-2) is provided with an air leakage port (120-5), and the air leakage port (120-5) is in communication with the air suction space (120-4) and with an external space.

5. A coal slime flotation pilot flotation column according to claim 1, It is characterized in that The bubble pushing mechanism (120) further includes An auxiliary plate body (120-6) is arranged on the swinging member (120-1); the auxiliary plate body (120-6) and the first bubble pushing plate (120-2) are located on one side of the air inlet plate (119).

6. A coal slime flotation pilot flotation column according to claim 1, It is characterized in that The bottom of the first bubble pushing plate (120-2) is provided with a plurality of strip-shaped gaps (120-7).

7. A coal slime flotation pilot platform system, It is characterized in that The invention comprises a coal slime flotation pilot flotation column according to any one of claims 1 to 6, wherein the flotation column (1) comprises a first-stage flotation column (1-1), a second-stage flotation column (1-2), and a third-stage flotation column (1-3), and further comprises Feeding barrel (2), A slurry mixer (3) is connected to the feed barrel (2). The slurry cylinder (4) comprises a first pool (401), a second pool (402), a third pool (403), and a fourth pool (404); the overflow of the slurry mixer (3) flows into the first pool (401); the first pool (401) leads to the first stage flotation column (1-1); the tailings outlet (110) of the first stage flotation column (1-1) leads to the second pool (402); the second pool (402) leads to the second stage flotation column (1-2); the tailings outlet (110) of the second stage flotation column (1-2) leads to the third pool (403); the third pool (403) leads to the third stage flotation column (1-3); the tailings outlet (110) of the third stage flotation column (1-3) leads to the fourth pool (404); A concentrate tank (5), wherein the concentrate overflow tanks (104) of the first-stage flotation column (1-1), the second-stage flotation column (1-2), and the third-stage flotation column (1-3) all lead to the concentrate tank (5).

8. A coal slime flotation pilot platform system according to claim 7, It is characterized in that Also includes a filter press (6), the concentrate tank (5) leading to the filter press (6), A belt conveyor (7), to which the filter cake of the filter press (6) passes, and the filter cake is transported away. A circulating water pool, into which the filtrate from the filter press (6) flows.

9. A coal slime flotation pilot platform system according to claim 8, It is characterized in that Also includes A mechanical flotation unit (9), wherein the feed cylinder (2) also leads to the mechanical flotation unit (9), the flotation concentrate of the mechanical flotation unit (9) leads to the concentrate tank (5) or to the flotation column (1), and the tailings lead to the fourth pool (404). The mobile platform (10) has a travel wheel (10-1), and the first-stage flotation column (1-1), the second-stage flotation column (1-2), the third-stage flotation column (1-3), the feed barrel (2), the slurry mixer (3), the slurry barrel (4), the concentrate tank (5), the filter press (6), and the belt conveyor (7) are all arranged on the mobile platform (10). A control console (11) is arranged on the mobile platform (10). The metering doser (12) leads to the first-stage flotation column (1-1), the second-stage flotation column (1-2), the third-stage flotation column (1-3), and leads to the mechanical flotation unit (9).

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