CN203264647U - Flotation agent feeding system based on falling type coal slurry preprocessor - Google Patents

Abstract

The utility model belongs to the field of coal slurry pretreatment equipment used for coal slime powder pretreatment, in particular to a flotation agent feeding system based on a drop type coal slurry preprocessor. The utility model at least includes a water jet nozzle for mixing water liquid and flotation agent, and the flotation agent feeding system also includes a secondary mixing unit; the liquid inlet end of the secondary mixing unit is connected to the mixed liquid outlet of the water jet nozzle The intermediate fixed arrangement, the flow section on the secondary mixing unit has a variable cross-section structure. Relying on the variable cross-section structure of the flow section on the secondary mixing unit, that is, the flow section changes gradually or abruptly on the drop path of the mixed liquid; When the emulsion passes through the secondary mixing unit, the mixed liquid itself produces turbulent flow, eddy current and even turbulent flow in the sudden or gradual change of the flow end surface, and finally makes the mixed liquid be divided and redirected again to further achieve the purpose of uniform mixing .

Description

Flotation agent feeding system based on drop coal slurry preconditioner

technical field

The utility model belongs to the field of coal slurry pretreatment equipment used for coal slime powder pretreatment, in particular to a flotation agent feeding system based on a drop type coal slurry preprocessor.

Background technique

Because the buoyancy of coal slime in our country is generally poor, coal slurry pretreatment is an indispensable link in the flotation coal preparation process, and it is a prerequisite for the flotation machine to obtain good technical and economic indicators. The necessity of coal slurry pretreatment mainly has the following four points: 1) Fully disperse the flotation agent (non-polar oil collector and foaming agent), the flotation agent of coal slime is insoluble or slightly soluble in water, Only when it is fully dispersed into a large number of tiny droplets can it be uniformly mixed into the coal slurry; 2) Mix the dispersed flotation agent well into the floating coal slurry, and the non-polar oil collector A relatively stable oil film is formed on the surface of coal particles with different diameters, which improves the hydrophobicity of coal particles; 3) It takes a certain time for the flotation agent to react physically and chemically on the surface of coal particles; 4) Dilute the floating coal slurry to Reasonable concentration range.

In the pretreatment process of coal slurry, there are generally three ways to disperse the flotation agent:

(1), mechanical dispersion

The XY series pulp preprocessor developed by our country in the 1980s is to introduce the flotation agent into the dosing nozzle, and then use the upper blades in the impeller stator mixer to rotate and disperse mechanically. Due to the limited linear speed of the impeller, only 8.0m/s, the diameter of the dispersed oil droplets is relatively large, and the mixing in the coal slurry is not uniform enough, which increases the amount of flotation agent.

(2), emulsification and dispersion

The structure of the water jet emulsifier popularized and used in some coal preparation plants in our country is roughly that the pressure water is sprayed from the nozzle at high speed, and a negative pressure is formed in the jet chamber. The flotation agent is thus sucked and wrapped into the jet, and dispersed into <15μm oil droplets through hydraulic impact and shearing, and the emulsion is sprayed out from the mixing tube. However, the water-jet emulsifier usually uses a single-side injection method, which leads to unstable air pressure on the jet, and the mixing uniformity between the drug and the water is often low, and further improvement is still needed.

(3) atomization dispersion

The XK series slurry preparer that began to be used in my country in the 1980s, such as the patent name applied by Tangshan Guohua Technology Co., Ltd. on January 15, 2010, is "atomized drop coal slurry preprocessor" (application No.: 201010033384.9) the invention patent text announced the following technical scheme: it consists of three parts: atomization system, upper box and lower box. The atomization system is composed of main motor, flexible coupling, sleeve, misting disc and dosing funnel, etc. The upper box is the working area for feeding and flotation agent atomization. There is a central feeding trough on the outside of the box, and overflow tanks on the left and right sides. The lower box body is the working space where the coal slurry and the flotation agent are fully mixed. There are three upper slides and two lower slides installed on the left and right sides, and the sills of the same height are evenly distributed on each slide. In actual use, the flotation agent flows into the sleeve above the fogging disk through the dosing funnel and the pipe, and splashes down on the central area of the front of the fogging disk, adhering to the high-speed rotating disk to form a thin liquid film. Under the action of the blade, it moves toward the edge of the pan, and is cut into mist droplets by the sawtooth on the edge of the pan; the floating coal slurry is distributed to the overflow weirs on both sides of the upper box through the central feeding trough, and overflows in a waterfall shape along the width of the weir. During the falling process, it meets the flotation agent droplets, and some of the droplets directly land on the upper slide on the first layer by gravity. After that, the coal slurry mixed with the flotation agent passes through the sills of the upper and lower slides and jumps continuously. Up and down, so that the coal slurry and the flotation agent droplets are fully mixed until they are discharged from the bottom of the tank and enter the flotation machine. As a relatively advanced coal slurry pretreatment device in the field, the flotation agent droplets are an order of magnitude smaller than the emulsified and dispersed droplets, and the dispersion effect is better; The dispersing effect of the medicine is achieved by the rotation of the fogging disc, which often requires a closed box to form a closed space to avoid the meaningless drift of the mist medicine, but the formation of the closed environment often causes problems such as fogging The working environment of the disc is poor, so it is easy to send product failures, it is impossible to realize the intuitive observation of the slurry mixing process, and it is difficult to find out the faults in time, which brings troubles to the on-site operation and maintenance work; in addition, the high-speed rotating fogging disc, The requirement for the drive motor speed is too high, that is, a secondary motor with a speed of up to 3000 rpm must be used to ensure its working performance, which poses severe challenges to the actual assembly, purchase and maintenance costs.

Contents of the invention

The purpose of the utility model is to overcome the shortcomings of the above-mentioned prior art, and provide a flotation agent feeding system based on a drop-type coal slurry preprocessor with a reasonable structure, so as to realize the uniform feeding requirements of the flotation agent and water liquid.

In order to achieve the above object, the utility model adopts the following technical solutions:

A kind of flotation agent feeding system based on drop-type coal slurry preprocessor, at least includes the water jet spray nozzle that is used for mixing water liquid and flotation agent, flotation agent feeding system also includes secondary mixing unit; Said The liquid inlet end of the secondary mixing unit is fixedly connected to the mixed liquid outlet of the water jet nozzle, and the cross-section of the secondary mixing unit has a variable cross-section structure.

The shape of the secondary mixing unit is in the shape of a sleeve, and more than one corrugated plate is arranged in the lumen thereof, and the ridges formed by the ridge-shaped crests of the corrugated plates are arranged vertically or intersecting with the falling path of the mixed liquid.

The ridge line formed by the ridge-shaped crest of the wave plate is arranged perpendicular to the falling path of the mixed liquid, and there are two wave plates arranged axially symmetrically along the axis of the secondary mixing unit.

The secondary mixing unit also includes a vertical baffle arranged at its lumen to divide the lumen into two symmetrical semicircular cavities, and the two wave plates are symmetrically arranged on both sides of the vertical baffle body.

A trumpet-shaped diffuser tube is arranged at the outlet end of the secondary mixing unit, and the small-diameter end of the diffuser tube is fixedly connected to the outlet end of the secondary mixing unit.

The secondary mixing unit is detachably matched with the water jet nozzle.

The water jet nozzle is a negative pressure spray structure, including an external pipe body and a built-in water nozzle arranged in the external pipe body. The built-in water nozzle is in the shape of a hollow frustum and a spray chamber is formed between its outer wall and the inner wall of the outer pipe. The outer pipe body of the water jet nozzle is symmetrically arranged along its axis with at least one pair of medicament feeding pipes communicating with the spray chamber; the upper end of the water jet nozzle constitutes the water liquid feed end, and the lower end orifice of the water jet nozzle constitutes the mixed liquid outlet.

The flotation agent feeding system also includes a holding tank arranged under the secondary mixing unit, and the outer wall of the holding tank is provided with an annular overflow tank; the inner wall of the annular overflow tank forms the tank wall of the cylindrical housing tank, and its outer wall constitutes The overflow wall and the overflow path of the annular overflow tank intersect with the traveling path of the coal slurry; the wall of the receiving tank is provided with a hole for connecting the cavity of the annular overflow tank and the cavity of the receiving tank.

There are seven holes and they are evenly distributed along the circumference of the wall of the receiving tank.

The accommodating tank is provided with a wear-resistant plate at the tank bottom where the outlet end of the secondary mixing unit is directed.

The beneficial effects of the utility model are:

1), borrowing part of the structure of the traditional water-jet emulsifier, and adding a secondary mixing unit at its outlet, relying on the variable cross-section structure of the flow section on the secondary mixing unit, that is, the flow section is mixing The drop path of the liquid changes gradually or abruptly; like this, when the initially mixed mixed liquid ejected from the aforementioned water jet nozzle, that is, the often-called emulsion, passes through the secondary mixing unit, the mixed liquid itself is changing suddenly or gradually. Turbulent flow, vortex and even turbulent flow are generated in the end surface of the flow, and finally the mixed liquid is divided and redirected again, and the oil droplets in it can be further chopped and dispersed, so as to further achieve the purpose of uniform mixing of the mixed liquid.

2) Relying on the corrugated plate placed in the lumen of the secondary mixing unit, the lumen is divided into at least two flow passages; due to the curved surface structure of the corrugated plate itself, the above-mentioned flow passages are naturally formed at this time A gradual flow cross section is formed, which also plays a turbulent, eddy and even turbulent effect on the passing fluid, and finally achieves its high-efficiency secondary mixing purpose.

3) The vertical partition arranged on the coincident axis of the plate surface and the secondary mixing unit ensures the gradual change of the flow section in the area where each wave plate is located, and avoids a certain flow section being too large or two wave plates interacting with each other. When it is parallel, there will be no gradual change in the flow section between the two; rely on the regional isolation effect of the vertical partition to ensure the efficient diversion and uniform mixing of the mixed liquid.

4) The detachable secondary mixing unit takes into account its weariness during long-term use; relying on its detachable cooperation with the water jet nozzle, it is obviously more convenient for later maintenance and replacement operations. It is convenient and fast, thereby helping to improve its actual use performance.

5) The drug feeding pipe presents an axisymmetric structure relative to the axis of the water jet nozzle, so that the air pressure effect on the jet flow in the lumen tends to be consistent, and the symmetrical structure of the medicine is conducive to stabilizing the fluid movement in the water jet nozzle, and at the same time It also helps the uniform contact between the emulsified agent and the fluid, so as to finally improve the mixing effect of the mixture.

6) Abandoning the traditional atomization structure of the fogging disc, considering the kinetic energy generated by the spraying method, the accommodation tank and even the annular overflow tank structure are set here, relying on the use of central feeding and ring side overflow feeding method, thereby achieving the purpose of reducing its fluid kinetic energy in multiple steps, so as to ensure that the mixed emulsion can always maintain a certain flow rate and stably overflow to the coal slurry below, and at the same time ensure a certain discharge height; The liquid and the diluted coal slurry collide and mix, and finally participate in the subsequent treatment process, and its overall work is reliable and stable; in addition, the jet feeding of the flotation agent does not need to deliberately pursue a fully enclosed environment, or even a normal open cylinder The stable feeding requirements of the flotation agent can be realized in a stable environment, which is obviously more convenient for the operator to visually observe, so as to achieve the purpose of timely evaluating the mixing state of various components in the drop box and the coal slurry and flotation agent , the operation is more intuitive, thus creating a good prerequisite for the efficient pretreatment of coal slurry.

Description of drawings

Fig. 1 is the use status schematic diagram of the utility model;

Fig. 2 is a top view schematic diagram of the structure of Fig. 1;

3 is a schematic diagram of the assembly structure of the water jet nozzle, the secondary mixing unit and the diffusion pipe;

Fig. 4 is the structural representation of secondary mixing unit;

Fig. 5 is an end view of the secondary mixing unit along its axial direction.

Detailed ways

Below again in conjunction with accompanying drawing, the specific components of the present utility model are described as follows:

The utility model absorbs the advantages of the traditional atomization drop type coal slurry preprocessor, which has the advantages of central feeding and overflow on the left and right sides, and abandons the atomizing agent of the fogging plate, so that the entire working system must be in a sealed environment, which makes the operator The disadvantage of being unable to observe the internal working conditions of the equipment, the water jet emulsifier emulsifying agent with a unique structure, on the one hand, achieves the effect of dispersing the emulsifying agent, on the other hand, makes the entire working system open to the operator, and the operator can clearly understand the working condition of the equipment , easy to operate. It draws on the advantages of different contact pretreatment time for the coarse and fine particles in the coal slurry, that is, low ash coarse particles and high ash fine mud, on the slides with sills in the traditional drop box. The outlet of the layer slide plate is designed with a "herringbone"-shaped material separation unit, so as to achieve the purpose of grading the coarse and fine grains in the coal slurry, and the specific coal slurry, flotation agent, emulsion and even mixed slurry The flow direction is shown by the dotted arrow in Figure 1-3, so as to further increase the difference in the residence time of coarse and fine particles in the preprocessor, eliminate the influence of high ash and fine mud, and make the surface of coal particles required for flotation It can form a sufficient and stable oil film, and the high-ash fine mud that does not need to be extracted in the flotation operation can minimize its adhesion to the flotation agent, thereby creating good technological conditions for coal slurry pretreatment, and ultimately ensuring subsequent flotation quality.

specific description:

1.1 Design of the cabinet

The box body designed by the utility model is not simply copying the box structure of the traditional XK series pulp preprocessor and the traditional atomization-dropping coal slurry preprocessor, but fully considers the factors of the coal slime flotation process to carry out perfected and improved.

(1) Design of feeding box

The feeding box, that is, the feeding box of the coal slurry feeding part is designed above one side of the drop box body, as shown in Figure 2, the central pipe A of the feeding box is the slurry feeding pipe, and the clean water pipes are on both sides b. This design fully considers the process, before the coal slurry is in contact with the emulsifying agent, it is diluted to a suitable concentration, which helps the agent to form a sufficient and stable oil film on the surface of the coal particles.

(2) The drop box of the utility model is a cylindrical box, and the upper part is an emulsification and feeding space. In order to ensure uniform feeding and facilitate the pipeline layout in the factory building, the feeding in the center and the overflow in the ring side are adopted. Feeding method; in order to ensure uniform overflow along the overflow wall of the coal slurry feeding part in the shape of an annular overflow tank, a transverse partition is arranged in the overflow tank, and 7 small holes of Φ300mm are uniformly distributed on the horizontal partition To form communication holes; the height of the overflow wall of the coal slurry feeding part is 100mm to maintain the stability of the discharge liquid flow.

(3), emulsifying agent box

The emulsifying agent box, that is, the aforementioned cylindrical accommodation tank 40 that constitutes the utility model is designed on the upper side of the drop box body, and is in the shape of a cylinder, with 7 small holes of Φ100mm evenly distributed around it to form a connected annular overflow tank 50 cavity and the hole 41 of the cavity of the receiving tank 40, and the height of the external annular overflow tank 50 is 230mm to maintain the stability of the discharge liquid flow, and at the same time, a certain discharge height can be naturally formed. The coal slurry collides and mixes on the uppermost slide in the drop box, and finally travels along the slide path formed by the slide.

1.2 Drug emulsification system

The utility model adopts the agent emulsification system, on the one hand, it can disperse the cutting agent and form small oil droplets of 5-20 μm to form the emulsion; Better man-machine communication interface. With the atomization system of the traditional fogging disc, the whole preprocessor shell must be closed, and it takes a long time to find and solve the problem. With the drug emulsification system, the preprocessor can work in an open environment , the operator can observe the working condition of the equipment, discover and solve problems in time.

(1), drug emulsifier

The medicament emulsifier adopted in this patent, that is, the water jet nozzle 10, is a water jet emulsifier, but it does not copy the structure of the traditional water jet, but is perfected and improved according to the use situation: a certain pressure of clear water from its The water enters from the feed end and sprays out from its internal nozzle at a speed of 15m/s, forming a negative pressure in the spray chamber of the water jet nozzle 10, so that the medicine is sucked into the spray chamber from the medicine feeding pipe 13 on both sides, and the medicine is drawn into the spray chamber. The high-speed water impact and cutting will disperse it into small oil droplets of 5-20 μm to form an emulsion; at this time, the treatment of the emulsion has not been completed, and then the emulsion still needs to enter the wavy shape of the secondary mixing unit 20 again. At the mixing plate group, fully mix and disperse again, and finally discharge.

Structural features of pharmaceutical emulsifier:

1) The medicine feeding pipe 13 presents an axisymmetric structure relative to the axis of the water jet nozzle 10; the air pressure effect on the internal jet tends to be consistent, which is conducive to stable fluid movement and also helps the uniform contact between the medicine and the fluid.

2) As shown in Figure 4-5, there is a vertical baffle in the tube cavity of the secondary mixing unit 20 to form a vertical partition 22, and two wave-shaped baffles on both sides to form a wave plate 21, so that the tube cavity The mixing ring area is divided into four areas. When the small oil droplets formed by the dispersion of the emulsion pass through the secondary mixing unit 20, they are divided and redirected again to generate turbulent flow, eddy current and even turbulent flow, so as to further achieve the separation of oil droplets. The purpose of mixing with water and liquid; of course, in actual use, other number of areas can also be divided according to the situation on site, as long as the effects of turbulent flow, eddy current and even turbulent flow and dispersion of oil droplets can be achieved, there will be no more here make a narrative.

1.3 Layered drop system

(1) As shown in Figure 1, seven layers of slides are arranged in a stacked manner in the drop box, and the angle between the surface of each layer of slides and the horizontal plane is 8°; the purpose is to make the flow rate of coal slurry on the slides Maintaining an appropriate speed not only ensures the mixing time of coal slurry and flotation agent, but also ensures a large processing capacity, and at the same time, the height of the equipment will not be too large.

(2) Among the seven-layer skateboards, the first, second, third, fourth, fifth, sixth, and seventh floors are defined from top to bottom, among which three sills are installed on the first, second, third, and fifth-layer skateboards, and four, Install four sills on the sixth and seventh floors. The cross-section of the sill is trapezoidal, the upper bottom is 10mm wide, the lower bottom is 25mm wide, and the height is 20mm. It is made of polymer wear-resistant materials. The sill is connected with the slide plate through the card slot, which is convenient for replacement. The sills are arranged equidistantly at 180mm, and the purpose of dense arrangement of high sills is to increase the degree of turbulence of the liquid flow.

(3) There is a "herringbone"-shaped distributing unit at the exit of the first and fourth slides, and its specific structure is shown in Figure 1. Set up a channel to guide low-ash coarse particles to move forward, and the corresponding side of the board where the other bottom edge is located naturally forms a falling area for high-ash fine mud, so that high-ash fine mud can directly cross the specified number of slides and reduce its contact with the float. The adhesion amount of the selected agent can be adjusted through the wrench connected to the outside to adjust the relative position of the distributing unit and the slide plate in the drop box, so as to realize the accurate positioning of the aforementioned low-ash coarse particles and high-ash fine mud, so as to ensure the separation The material distribution and diversion effect of the material unit; the height-adjustable structure formed by the "herringbone" shape material distribution unit in the utility model can more conveniently serve the purpose of diverting the upper fine particles and the lower coarse particles in the coal slurry , the fine particles, that is, high ash fine mud, fall directly from the end of the first layer of slides to the fourth layer of slides, and from the end of the fourth layer of slides to the seventh layer of slides. During the whole falling process, the coarse particles, that is, the low-ash coarse particles in the coal slurry, must pass through the seven-layer slide board layer by layer in the drop box, and the fine particles only need to pass through three layers of slide boards in the drop box. The preparation time of particles is longer than that of fine particles, so that different particles have different pretreatment time, which provides better process conditions for the separation of coal slurry.

4.1 Brief description of the working process

In actual operation, as shown in Figure 1, clean water with a certain pressure enters the water jet nozzle 11 through the valve C and the flow meter D, and forms a high-speed jet at the outlet of the built-in water nozzle 12; The inner cavity of the nozzle 10, that is, the injection cavity, forms a negative pressure. After the medicine is sucked into the injection cavity from the inlets on both sides, it is impacted and cut by the high-speed water flow and dispersed into small oil droplets of 5-20 μm to form an emulsion; the emulsion enters The secondary mixing unit 20 at the lower part of the water jet nozzle 10 is fully mixed and dispersed again, and finally discharged from the outlet and finally falls into the lower holding tank 40 , and finally flows into the annular overflow tank 50 through the holding tank 40 and overflows. In order to ensure that the water jet nozzle 10 will not cause impact and wear to the bottom of the receiving tank 40 during long-term use, anti-wear protection measures such as a wear-resistant plate 60 can be provided in advance to provide anticipatory protection.

Simultaneously again as shown in Figure 1, coal slurry enters the annular overflow trough shape coal slurry feeding part E through the feeding box, evenly overflows onto the first layer, that is, the uppermost slide plate along its overflow wall, and is consistent with the utility model The spilled agent emulsion collides and mixes, and the coal slurry mixed with flotation agent passes through the sill F on the first slide, jumps and falls continuously, so that the coal slurry and the emulsifying agent are fully mixed until they are discharged from the bottom of the tank Enter the flotation machine. Coarse particles with low ash content move close to the slide plate and are blocked by the sills. The movement speed is slow and the pretreatment time is long, so that the surface can adhere to a sufficient and stable oil film, and after entering the flotation machine, it can quickly adhere to the air bubbles and float up. The fine mud with high ash content moves with the water flow in the upper layer, and the movement speed is fast. At the same time, under the action of the "herringbone"-shaped material distribution unit G set at the first and fourth slides, the high-ash fine mud only flows through the three slides. The pretreatment time is short, avoiding too much flotation agent adsorbed on its surface, slowing down their flotation speed in the flotation machine, and reducing the pollution of high-ash fine mud to flotation clean coal to the greatest extent; while low-ash coarse Particles go through the entire surface of the slide plate layer by layer, and the dispersed flotation agents have enough time to wrap and mix well on the low-ash coarse particles to form a relatively stable oil film, thereby improving its hydrophobicity, and finally for the follow-up The flotation operation provides reliable guarantee.

Claims (10)

1. A flotation agent feeding system based on a drop-type coal slurry preprocessor, at least including a water jet nozzle (10) for mixing water liquid and flotation agent, characterized in that: the flotation agent is fed into The material system also includes a secondary mixing unit (20); the liquid inlet end of the secondary mixing unit (20) is fixedly connected to the mixed liquid outlet of the water jet nozzle (10), and the process on the secondary mixing unit (20) The flow section is a variable cross-section structure. 2. The flotation agent feeding system according to claim 1, characterized in that: the secondary mixing unit (20) is in the shape of a sleeve, and more than one wave plate (21) is arranged in the tube cavity, so The ridges formed by the ridge-like crests of the wave plate (21) are arranged perpendicular to or intersecting with the falling path of the mixed liquid. 3. The flotation agent feeding system according to claim 2, characterized in that: the ridge line formed by the ridge-shaped crest of the wave plate (21) is arranged perpendicular to the falling path of the mixed liquid, and the wave plate (21) ) are two and arranged axisymmetrically along the axis of the secondary mixing unit (20). 4. The flotation agent feeding system according to claim 3, characterized in that: the secondary mixing unit (20) also includes a vertical partition arranged at its lumen to divide its lumen into two symmetrical semicircular cavities plate (22), the two corrugated plates (21) are symmetrically arranged on both sides of the plate body of the vertical partition (22). 5. The flotation agent feeding system according to claim 1 or 2 or 3 or 4, characterized in that: a trumpet-shaped diffuser tube (30) is arranged at the outlet end of the secondary mixing unit (20), and the diffuser tube The small-diameter end of (30) is fixedly connected to the outlet end of the secondary mixing unit (20). 6. The flotation agent feeding system according to claim 1 or 2 or 3 or 4, characterized in that: the secondary mixing unit (20) is detachably matched with the water jet nozzle (10). 7. The flotation agent feeding system according to claim 1 or 2 or 3 or 4, characterized in that: the water jet nozzle (10) is a negative pressure jet structure, including an external pipe body (11) and setting The built-in water nozzle (12) in the outer pipe body (11), the said built-in water nozzle (12) is in the shape of a hollow cone and forms a spray chamber between its outer wall and the inner wall of the outer pipe body (11), and the water jet nozzle (10 ) on the outer pipe body (11) along its axis is symmetrically arranged with at least one pair of medicament feeding pipes (13) connected to the spray chamber; ) The lower end orifice constitutes the outlet of the mixed solution. 8. The flotation agent feeding system according to claim 1 or 2 or 3 or 4, characterized in that: the flotation agent feeding system further comprises a holding tank (40) arranged below the secondary mixing unit (20) ), the outer wall of the accommodation tank (40) is provided with an annular overflow tank (50); the inner wall of the annular overflow tank (50) constitutes the groove wall of the cylindrical accommodation tank (40), and its outer wall constitutes the overflow wall. The overflow path of the overflow tank (50) intersects the traveling path of the coal slurry; the wall of the accommodation tank (40) is provided with a hole for connecting the cavity of the annular overflow tank (50) and the cavity of the accommodation tank (40) Road (41). 9. The flotation agent feeding system according to claim 8, characterized in that there are seven holes (41) uniformly distributed along the circumference of the tank wall of the holding tank (40). 10. The flotation agent feeding system according to claim 8, characterized in that: the holding tank (40) is provided with a wear plate ( 60).

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