CN110201790B - A sorting and recycling system and sorting and recycling process for wide-grained coal slime - Google Patents

Abstract

The invention relates to a wide-size coal slime separation and recovery system and a wide-size coal slime separation and recovery process, belongs to the technical field of coal separation and processing, and solves the problems of complex process flow, high cost, high energy consumption and environmental harm of the wide-size coal slime separation process in the prior art. The separation and recovery system is provided with a stirring barrel, a hydraulic flotation machine, a three-product cyclone classifying screen, an ore pulp preprocessor and a flotation column along a separation pipeline; a first buffer barrel is arranged between the hydraulic flotation machine and the three-product cyclone classifying screen, a second buffer barrel is arranged between the three-product cyclone classifying screen and the ore pulp preprocessor, and the ore pulp preprocessor is connected with the flotation column. The sorting and recycling process comprises the following steps: feeding the float coal slurry into a stirring barrel, stirring and mixing into ore pulp, and feeding the ore pulp into a hydraulic flotation machine; carrying out primary grading; grading coarse-grained concentrate, fine-grained coal slime and fine-grained coal slime; and (4) accurately sorting fine-particle coal slime. The invention realizes the continuous coal slime separation with wide size fraction and short flow.

Description

A sorting and recycling system and sorting and recycling process for wide-grained coal slime

technical field

The invention relates to the technical field of coal sorting and processing, in particular to a sorting and recycling system and a sorting and recycling process for wide-grained coal slime.

Background technique

As the main energy source in my country, coal has made great contributions to the national economy and social development. Due to the extensive utilization of coal, low energy efficiency, heavy pollution, and low comprehensive utilization of secondary resources and other problems still unresolved, the future development of my country's coal industry will be further constrained by resources and the environment. Therefore, by improving the level of coal sorting, realizing the clean and efficient utilization of coal, energy saving and emission reduction, and ensuring the sustainable development of the coal industry under the new normal of my country's economic development. Coal sorting and processing is the source and foundation of clean coal technology. It uses mechanical processing or physical and chemical methods to remove harmful impurities in coal, improve the quality of coal, and provide quality products for different users, so as to achieve clean and efficient use of coal.

With the rapid development of mechanized coal mining and the application and popularization of heavy medium coal preparation technology, the content of coal slime has increased significantly, and the coal slime has the characteristics of micronization, high ash content, and large content of conjoined organisms. high demands. However, the traditional coal slime treatment process is complicated, the coal slime separation and recovery ability is weak, and the adaptability to the fluctuation of coal quality is poor.

The existing slime separation process is as follows: 0-2mm floating slime is pre-classified with 0.25mm by a hydrocyclone, 0.25-2mm coarse-grained slime is often separated by TBS interference bed, 0-0.25mm fine-grained slime Recovered by flotation machine\flotation column. Restricted by the classification efficiency of the hydrocyclone and the low level of the coal slime separation process, the separation of coarse-grained slime is often accompanied by the entrainment of fine mud, resulting in contamination of concentrate products and substandard ash content; The concentrate is easily desorbed from the bubbles, and the phenomenon of "running coarse" is serious. The clean coal is lost in the tailings, and the tailings have low ash content, high calorific value, and waste of coal resources.

In the face of the contradiction between the current situation of resources, such as the gradual deterioration of coal quality and the increasing production of coal slime, and the complexity of the coal slime separation process with limited processing capacity, it is urgent to develop a coal slime separation technology with simple process, wide adaptability and strong processing capacity. Select process. This process simplifies the coal slime separation process and realizes wide coal slime by taking advantage of technical advantages such as the pre-throwing of the hydraulic flotation machine, the fine-grain classification of the three-product cyclone screen and the precise separation of fine particles by the flotation column. The continuous gradient separation of the short process and the short process avoids the pollution of fine mud in the separation process of coarse slime and the desorption of coarse particles during the separation of fine coal slime.

SUMMARY OF THE INVENTION

In view of the above analysis, the present invention aims to provide a sorting and recycling system and a sorting and recycling process for wide-grained slime, so as to solve the complex, high cost, high energy consumption, The problem of harm to the environment.

The object of the present invention is mainly achieved through the following technical solutions:

On the one hand, the present invention provides a sorting and recycling system for wide-grained coal slime. The sorting and recycling system is provided with a stirring tank, a hydraulic flotation machine, a three-product cyclone classification screen, and a slurry pre-processing system along the sorting pipeline. The processor and the flotation column; the first feeding pump is arranged between the mixing tank and the hydraulic flotation machine; the lower part of the hydraulic flotation machine is a conical structure, and the upper side of the conical structure is provided with a fluidization nozzle, and the hydraulic flotation machine The bottom of the separator is provided with an underflow port; a first buffer bucket is arranged between the hydraulic flotation machine and the three-product cyclone classification screen. The first buffer bucket is connected to the three-product cyclone classification screen through the second feed pump. A second buffer barrel is arranged between the cyclone classification screen and the pulp pre-treatment device, the second buffer barrel is connected to the pulp pre-treatment device through the third feed pump, and the pulp pre-treatment device is connected to the flotation column.

Further, the top of the hydraulic flotation machine is provided with a feeding port, the feeding port is connected with the first feeding pump, and the upper side of the hydraulic flotation machine is provided with an overflow port.

Further, a circulating pump is also included, and the circulating pump is connected to the fluidization water port at the bottom of the hydraulic flotation machine through the microbubble generator.

Further, the lower part of the three-product cyclone classification screen has a conical structure.

Further, the three-product cyclone classification screen is provided with an underflow port and an overflow port.

Further, a feeding device is also provided, and the feeding device feeds the coal slime to be flotated into the mixing tank.

On the other hand, the present invention also provides a sorting and recycling process for wide-grained slime, the sorting and recycling process comprising the following steps:

Step 1: Feed the floating coal slime into the mixing barrel, add water and the collector in the mixing barrel, and mix it into a slurry. After mixing evenly, it is fed into the hydraulic flotation machine;

Step 2: Supply clean water into the fluidization nozzle at the bottom of the hydraulic flotation machine through the microbubble generator for primary classification. The first buffer bucket; the coarse gangue particles in the coarse coal slime are discharged through the bottom flow port of the hydraulic flotation machine;

Step 3: Add water to the first buffer bucket, and after stirring evenly, feed it into the three-product cyclone classification screen for classification, the fine-grained slime and fine-grained slime enter the second buffer bucket, and the coarse-grained concentrate products are swirled by the three products. The bottom flow port of the grading screen is discharged;

Step 4: The slurry in the second buffer barrel is pre-mineralized, and then fed into the flotation column for precise separation of fine-grained slime.

Further, in the second step, when clear water passes through the microbubble generator, air and foaming agent are inhaled.

Further, the specific steps of the precise sorting of the fine-grained slime in the step 4 are as follows: the fine-grained slime and the bubbles rising in the flotation column form a countercurrent, and the fine-grained clean coal with good surface hydrophobicity and the bubbles collide and adhere to the bubbles and float up. , collected and discharged from the overflow tank at the upper end of the flotation column; fine-grained gangue with poor surface hydrophobicity is discharged from the bottom flow outlet at the bottom of the flotation column.

Further, in the first step, the collector is one or a combination of kerosene and diesel.

Compared with the prior art, the present invention has at least one of the following beneficial effects:

a) The wide-grain coal slime sorting and recovery system provided by the present invention, by pre-setting a hydraulic flotation machine, combines gravity separation and flotation technology to achieve continuous and accurate sorting of coarse-grained slime, and coarse-grained gangue. It is discharged in advance to shorten the operation process and improve the processing capacity of the system; secondly, with the help of the desliming classification of the three-product cyclone classification screen, the separation of the coarse-grained concentrate and the fine-grained slime is realized, and the raw materials are prepared for the flotation operation. The continuity of the mud separation process also reduces the pollution of fine mud to the coal mud separation process; using the separation and recovery system of the present invention, fluidization water is provided at the fluidization nozzle at the bottom of the hydraulic flotation machine to provide coarse particles with fluidized water. The flotation provides conditions and improves the flotation effect; the sorting and recovery system of the present invention has the advantages of simple structure, low energy consumption, green environmental protection, and wide application prospects.

b) The separation and recovery process of the wide-grained slime provided by the present invention firstly adopts a hydraulic flotation machine to discharge the coarse-grained gangue in advance, which shortens the operation process and improves the processing capacity of the system; The advanced desliming classification realizes the separation of coarse-grained concentrate and fine-grained slime, prepares raw materials for flotation operations, ensures the continuity of the slime separation process, and reduces the pollution of fine slime to the slime separation process. ; Combined with the precise separation and recovery ability of fine-grained slime by using flotation column, it can realize the separation and recovery of the whole-grained slime from coarse to fine.

c) The present invention adopts the continuous coal slime separation and recovery process with wide particle size and short flow, reduces the transportation path of coal slime in the system, reduces the mutual abrasion of coal slime with the pipeline wall and the coal slime itself during transportation, and prevents coal slime from The slime is over-ground, and the production input cost is reduced at the same time, so as to realize the efficient separation of the slime; the gradient separation of the slime can effectively alleviate the fine slime pollution in the coarse slime separation process and the coarse particles in the fine slime separation process. The problems of "desorption" and "coarse running"; the separation and recovery process of the wide-grained coal slime of the present invention has the advantages of simple process, low cost, low energy consumption, and no harm to the environment.

In the present invention, the above technical solutions can also be combined with each other to achieve more preferred combination solutions. Additional features and advantages of the invention will be set forth in the description which follows, and some of the advantages may become apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by means of particularly pointed out in the description and drawings.

Description of drawings

The drawings are for the purpose of illustrating specific embodiments only and are not to be considered limiting of the invention, and like reference numerals refer to like parts throughout the drawings.

Fig. 1 is the structure schematic diagram of the sorting and recovery system of the medium and wide-grained slime of embodiment 1;

FIG. 2 is a flow chart of the sorting and recycling process in the second embodiment.

Reference number:

1-mixing barrel; 2-first feeding pump; 3-circulating pump; 4-microbubble generator; 5-hydraulic flotation machine; 6-first buffer barrel; 7-second feeding pump; 8-three Product cyclone classification screen; 9- the second buffer barrel; 10- the third feed pump; 11- slurry pre-treatment device; 12- flotation column; - Coarse-grained tailings; e-coarse-grained concentrate; f-fine-grained slime; g-fine-grained tailings; h-fine-grained concentrate.

Detailed ways

The preferred embodiments of the present invention are specifically described below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present application, and together with the embodiments of the present invention, are used to explain the principles of the present invention, but are not used to limit the scope of the present invention.

Example 1

A specific embodiment of the present invention, as shown in FIG. 1, discloses a wide-grain coal slime sorting and recovery system. Along the sorting pipeline, there are a stirring tank 1, a hydraulic flotation machine 5, and a three-product swirl flow. The grading screen 8, the pulp pretreatment device 11 and the flotation column 12; the first feeding pump 2 is arranged between the mixing tank 1 and the hydraulic flotation machine 5; The port is connected with the first feeding pump 2, the upper side of the hydraulic flotation machine 5 is provided with an overflow port, the lower part of the hydraulic flotation machine 5 is a conical structure, and the upper side of the conical structure is provided with a fluidization water port, The bottom of the hydraulic flotation machine 5 is provided with an underflow port; a first buffer bucket 6 is arranged between the hydraulic flotation machine 5 and the three-product cyclone grading screen 8, and the first buffer bucket 6 passes through the second feed pump 7 and the three products. The cyclone classification screen 8 is connected, and a second buffer bucket 9 is arranged between the three-product cyclone classification screen 8 and the pulp pretreatment device 11. The second buffer bucket 9 is connected to the bottom of the pulp pretreatment device 11 through the third feed pump 10. Connection, the pulp pretreatment device 11 is connected with the flotation column 12 .

Specifically, the lower part of the hydraulic flotation machine 5 is a conical structure, and the upper side of the conical structure is provided with a fluidization water port, and clean water b is supplied to the fluidization water port at the bottom of the hydraulic flotation machine 5 through the circulating pump 3, and the circulating pump 3 A microbubble generator 4 is arranged between it and the fluidization nozzle at the bottom of the hydraulic flotation machine 5 . The conical structure at the lower part of the hydraulic flotation machine 5 can concentrate the underflow ore pulp and play a certain role in dehydration. During the implementation, the ore pulp is fed into the hydraulic flotation machine from the top, and is sorted in the rising water flow containing air bubbles. The density of the gangue particles is large. And the surface hydrophobicity is poor and does not collide and adhere with the bubbles, so it cannot float up and become an overflow under the action of the rising water flow containing bubbles, and can only sink into the conical structure at the bottom of the hydraulic flotation machine as an underflow. The pulp at the upper part of the shape structure continuously squeezes the pulp at the bottom of the cone under the action of gravity; the design of the cone structure gradually reduces the cross-sectional area from top to bottom, so that the pressure of the pulp squeezed from top to bottom gradually increases, Reduce the moisture in the particle gap, and play a certain role in concentrating the underflow.

Specifically, the third feeding pump 10 is connected to the bottom of the pulp pre-treatment device 11, and the pulp pre-treatment device is fed from the bottom and stirred by the internal impeller to conduct sufficient stirring and contact of gas-liquid-solid three-phase to complete the pre-mineralization. Finally, it flows into the flotation column 12 from the upper part through the pipeline.

Specifically, the lower part of the three-product cyclone classification screen 8 is a conical structure, and the three-product cyclone classification screen 8 is provided with an underflow port capable of discharging high-density coarse-grained concentrate products and a low-density fine-grained slime. Overflow.

Specifically, the wide-grain coal slime sorting and recovery system is further provided with a feeding device, and the feeding device feeds the floating coal slime into the mixing drum 1 .

During the implementation, the feeding device will feed the floating coal slime into the mixing tank 1, add water to mix and adjust the slurry, add a certain amount of collector according to the characteristics of the coal, and after stirring evenly, the first feeding pump 2 is continuously uniform and stable. The ore pulp is transported to the upper feed port of the hydraulic flotation machine 5; clean water b is supplied to the fluidization nozzle at the bottom of the hydraulic flotation machine 5 through the microbubble generator 4 through the circulating pump 3 at a certain pressure. 4, a negative pressure area in a certain area will be formed, and air c and a certain amount of foaming agent will be sucked in; after the clean water b is supplied to the hydraulic flotation machine 5, the air will be precipitated as the pressure decreases, and the water will flow out of the hydraulic flotation machine with the water flow. The bottom of the machine 5 rises, and the coarse-grained slime in the slurry is disturbed and settled in the fluidized water flow rising in the hydraulic flotation machine 5, and the addition of the collector improves the surface of the coarse-grained concentrate and the gangue in the coarse-grained slime. The difference in hydrophobicity between the two, the coarse-grained concentrate with good hydrophobicity collides and adsorbs with the bubbles mixed in the fluidized water, and the hydrophilic gangue does not adsorb with the bubbles; the adsorption of the bubbles reduces the apparent density of the coarse-grained concentrate. The density difference between the coarse-grained concentrate and the gangue is enlarged, which is convenient for the coarse-grained concentrate to float; The gangue in the coarse particles sinks into the bottom of the hydraulic flotation machine 5 as the coarse tailings d, and is discharged through the bottom flow outlet of the hydraulic flotation machine 5, and is transported to the thickener through the pipeline for subsequent dehydration operations. Using the hydraulic flotation machine 5, through the combination of gravity separation and flotation technology, the tailings products are discharged through the underflow port of the hydraulic flotation machine 5, and the flotation concentrate is collected through the overflow port of the hydraulic flotation machine 5, so as to realize the Coarse-grained slime is continuously and accurately sorted, and the coarse-grained gangue is discharged in advance to shorten the operation process and improve the processing capacity of the system.

An appropriate amount of water is added into the first buffer bucket 6, and after stirring evenly, the second feed pump 7 is fed into the three-product cyclone grading screen 8 along the tangential direction, and the pulp forms a cyclone in the three-product cyclone grading screen 8 and moves downward. The downward moving ore pulp is cut by the screen bars on the side wall of the three-product cyclone classification screen 8, and the fine-grained slime f in the ore pulp that is smaller than the screen hole is discharged through the screen hole, and the coarse-grained concentrate on the screen continues to move downward with the slurry. The outer swirl flow is formed and discharged as coarse-grained concentrate e from the bottom flow port of the three-product cyclone classification screen 8; the fine-grained slime on the screen moves to the conical section with the slurry, and gradually separates from the outer swirl flow with the gradual increase of the resistance. A bottom-to-top internal swirling flow is formed, which is discharged from the overflow port of the three-product cyclone grading screen 8 with a screen mesh, and enters the second buffer barrel 9 together with the fine-grained slime f, considering that the fine-grained slime ash is relatively high. , when the particle size is small, the selectivity is poor, and the on-site workload is large, the fine-grained slime can be shunted and adjusted to improve product quality; with the help of the desliming classification of the three-product cyclone screen, the separation of coarse-grained concentrate and fine-grained slime can be realized. Separation and preparation of raw materials for flotation operations ensure the continuity of the slime separation process and reduce the pollution of the fine slime to the slime separation process.

Add a proper amount of water to the slurry in the second buffer barrel 9, and after stirring evenly, the third feeding pump 10 is continuously, uniformly and stably fed into the slurry preprocessor 11, and the slurry is added and stirred in the slurry preprocessor 11 to complete the pre-mineralization. , and then evenly fed into the flotation column 12 for precise sorting of fine-grained slime.

Compared with the prior art, the wide-grain coal slime sorting and recovery system provided in this embodiment combines the gravity separation and flotation technologies by pre-setting a hydraulic flotation machine to achieve continuous and accurate coarse-grained coal slime. In sorting, the gangue is discharged in advance to shorten the operation process and improve the processing capacity of the system; secondly, with the help of the desliming classification of the three-product cyclone classification screen, the separation of the coarse-grained concentrate and the fine-grained slime is realized, and the raw materials are prepared for the flotation operation. , to ensure the continuity of the coal slime separation process, and also reduce the pollution of the fine mud to the coal slime separation process; using the separation and recovery system provided in this embodiment, the fluidization nozzle at the bottom of the hydraulic flotation machine provides flow Dissolve water, provide conditions for coarse particle flotation and improve flotation effect. The sorting and recycling system of the invention has the advantages of simple structure, low energy consumption, environmental protection and wide application prospect.

Embodiment 2

A specific embodiment of the present invention, as shown in FIG. 2 , discloses a sorting and recycling process for wide-grained coal slime. For example, using the device provided in Example 1, the sorting and recycling process includes the following steps:

Step 1: Feed the floating coal slime a into the mixing barrel, add water and the collector in the mixing barrel, and mix it into a slurry. After mixing evenly, the first feeding pump will continuously and stably supply hydraulic power. Flotation machine;

Preferably, the pulp concentration in step 1 is 400-600 g/L. If the slurry concentration is too low, the processing capacity is too low, the consumption of chemicals is large, and the production cost is high; if the slurry concentration is too high, the resistance between particles also increases, which is not conducive to interfering with the progress of sedimentation. Increase the ash content of clean coal and deteriorate the sorting effect. Therefore, the pulp concentration is set at 400-600g/L, such as 500g/L.

Preferably, the collector in step 1 is one or more combinations of kerosene, diesel or other collectors for coal preparation, and the collector can improve the hydrophobicity difference between the surface of the clean coal and the gangue in the coarse-grained material , the collector is adsorbed on the surface of the coal to improve the hydrophobicity of the coal surface, and the bubbles are easily adsorbed on the surface of the clean coal with good hydrophobicity, which provides a prerequisite for the separation of coarse particles.

Step 2: Supply clean water b to the fluidization nozzle at the bottom of the hydraulic flotation machine through the micro-bubble generator at a certain pressure through the circulating pump. When the clean water b passes through the micro-bubble generator, a negative pressure area in a certain area will be formed, and air c will be sucked in. and a certain amount of foaming agent; the coarse-grained slime in the pulp completes interference settlement in the hydraulic flotation machine, and the coarse-grained concentrate and fine-grained slime are discharged from the overflow port of the hydraulic flotation machine and enter the first buffer bucket ; Coarse gangue particles in the coarse-grained slime sink into the bottom of the hydraulic flotation machine as coarse-grained tailings, and are discharged through the bottom outlet of the hydraulic flotation machine.

Specifically, the foaming agent in step 2 is one or more combinations of sec-octanol, MIBC or other types of surfactants. The foaming agent can reduce the interfacial tension of bubbles, which is conducive to the formation of microbubbles; improve the stability of bubbles , reducing the merger of bubbles, which is conducive to the dispersion of bubbles and increases the gas content. The selective adsorption of microbubbles and coarse-grained concentrates reduces the apparent density of coarse-grained concentrates, increases the apparent density difference with coarse-grained gangue particles, and improves the sorting effect.

Specifically, the amount of the foaming agent in step 2 is 200-550g/t, for example, 200g/t; when the amount of the foaming agent is too small, the stability of the bubbles is poor, the gas content rate is low, and the bubbles are easily merged, and the large bubbles are not conducive to The coarse-grained concentrate floats up, the desorption phenomenon is serious, and the separation efficiency is low; when the amount of foaming agent is too large, the amount of foam is too large, the gas hold-up rate is too high, the selectivity of bubble attachment is poor, and there is not enough space for the particles to settle, a large amount of The gangue particles are carried by the foam into the overflow, which increases the ash content of the overflow, and the stability of the bubbles is too strong, and the defoaming process is difficult, which is not conducive to pipeline transportation and subsequent dehydration operations, and wastes costs and is not economical.

Specifically, the coarse-grained concentrate with good hydrophobicity in step 2 collides and adsorbs with the bubbles mixed in the fluidized water, and the hydrophilic coarse-grained gangue does not adsorb with the bubbles, and the adsorption of the bubbles reduces the surface of the coarse-grained concentrate. The apparent density increases the density difference between the coarse-grained concentrate and the gangue, which facilitates the floating of the coarse-grained concentrate; the coarse-grained concentrate and fine-grained slime are discharged from the overflow port of the hydraulic flotation machine with the rising water flow and enter the first buffer The coarse gangue particles in the coarse particles sink into the bottom of the hydraulic flotation machine as coarse tailings, and are discharged through the bottom flow outlet of the hydraulic flotation machine.

Specifically, the particle size of the coarse tailings d is 0.5-2 mm.

Step 3: Add water into the first buffer bucket, and after stirring evenly, the second feed pump will continuously, evenly and stably feed the three-product cyclone classification screen along the tangential direction at a certain pressure for classification. The swirl flow is formed to move downward; the downward moving ore pulp is cut by the screen bars on the side wall of the three-product swirl classification screen, and the fine-grained slime f in the slurry that is smaller than the sieve hole is discharged through the sieve hole; The slurry continues to move downward to form an external swirl and is discharged as coarse-grained concentrate e from the bottom flow opening of the three-product cyclone classification screen; the fine-grained slime on the screen moves with the slurry to the conical section at the lower part of the three-product cyclone classification screen, and is followed by any The resistance gradually increases and gradually separates from the outer swirl flow, forming a bottom-to-up inner swirl flow, which is discharged from the overflow port of the three-product cyclone classification screen with a screen mesh, and enters the first stage together with the fine-grained slime f under the screen. Two buffer buckets.

Specifically, in step 3, the particle size of the fine-grained slime f is less than 0.045 mm, the particle size of the coarse-grained concentrate e is 0.5-2 mm, and the particle size of the fine-grained slime is greater than or equal to 0.045 mm and less than 0.5 mm.

Specifically, in step 3, the size of the valve on the fine-grained slime f pipeline can be adjusted according to the actual production conditions on site, to control the amount of fine-grained slime entering the second buffer barrel, and to improve the flexibility and stability of the system.

Step 4: Add an appropriate amount of water to the slurry in the second buffer barrel, and after stirring evenly, the third feeding pump will continuously, evenly and stably feed the slurry into the slurry preprocessor. Then it is evenly fed into the flotation column for precise sorting of fine-grained slime.

Specifically, after adding water to the pulp and stirring evenly in step 4, the concentration of the pulp is controlled at 60-120 g/L, for example, 80 g/L; the ingredients of the medicine are collectors and foaming agents.

Step 5: The fine-grained slime and the rising bubbles in the flotation column form a countercurrent, and the fine-grained fine coal with good surface hydrophobicity is easy to collide and adhere with the bubbles and float up, as the fine-grained concentrate h from the overflow tank at the upper end of the flotation column Collect and discharge; fine-grained gangue with poor surface hydrophobicity does not collide and adhere with air bubbles, sinks to the bottom of the flotation column, and is discharged from the bottom of the flotation column as fine-grained tailings g.

Compared with the prior art, in the separation and recovery process of wide-grained coal slime provided in this embodiment, the coal slime is first accurately separated by a hydraulic flotation machine, and the coarse-grained gangue is discharged in advance, shortening the operation process and improving the system processing capacity. Secondly, by means of the desliming classification of the three-product cyclone classification screen, the separation of coarse-grained concentrate and fine-grained slime is realized, and raw materials are prepared for the flotation operation, which ensures the continuity of the slime separation process and reduces the number of fine particles. The pollution of slime to the slime separation process; combined with the precise separation and recovery ability of fine-grained slime by using flotation column, the separation and recovery of the whole-grained slime from coarse to fine can be realized; The unique slime separation process is beneficial to increase the processing capacity of the system, reduce the transportation path of the slime in the system, reduce the mutual wear of the slime with the pipeline wall and the slime itself during transportation, prevent the slime from being over-grinded, and reduce production at the same time. The input cost can realize the high-efficiency separation of coal slime; the gradient separation of coal slime can effectively alleviate the pollution of fine slime in the separation process of coarse slime and the desorption of coarse particles and "running coarse" in the separation process of fine slime. Problem: The separation and recovery process of the wide-grained slime of the present invention has the advantages of simple process, low cost, low energy consumption, and no harm to the environment.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Substitutions should be covered within the protection scope of the present invention.

Claims (10)

1. a sorting and recovery system for wide-grained slime, characterized in that it comprises agitating bucket (1), hydraulic flotation machine (5), three-product cyclone classification screen (8) provided along the sorting pipeline , a pulp pretreatment device (11) and a flotation column (12); a first feeding pump (2) is arranged between the mixing barrel (1) and the hydraulic flotation machine (5); The lower part of the hydraulic flotation machine (5) is a conical structure, the upper side of the conical structure is provided with a fluidization nozzle, and the bottom of the hydraulic flotation machine (5) is provided with an underflow port; A first buffer bucket (6) is arranged between the product cyclone classification screens (8), and the first buffer bucket (6) is connected with the three-product cyclone classification screen (8) through a second feed pump (7), and the three-product cyclone classification screen (8) is A second buffer bucket (9) is arranged between the cyclone classification screen (8) and the pulp preprocessor (11), and the second buffer bucket (9) passes through the third feed pump (10) and the pulp preprocessor (11). ) is connected, and the pulp pretreatment device (11) is connected with the flotation column (12). 2. The sorting and recovery system according to claim 1, characterized in that, the top of the hydraulic flotation machine (5) is provided with a feeding port, and the feeding port is connected with the first feeding pump (2), and the hydraulic flotation The upper side of the machine (5) is provided with an overflow port. 3. The sorting and recovery system according to claim 2, characterized in that, further comprising a circulating pump (3), the circulating pump (3) passing through the fluidization of the microbubble generator (4) and the hydraulic flotation machine (5) Nozzle connection. 4. The sorting and recycling system according to claim 1, wherein the lower part of the three-product cyclone classification screen (8) is a conical structure. 5 . The sorting and recycling system according to claim 4 , wherein the three-product cyclone classification screen ( 8 ) is provided with an underflow port and an overflow port. 6 . 6. The sorting and recycling system according to any one of claims 1-5, characterized in that, a feeding device is further provided, and the feeding device supplies the sludge to be flotated for the stirring barrel (1). . 7. A sorting and recycling process for wide-grained slime, characterized in that, adopting the sorting and recycling system according to claim 3, the sorting and recycling process comprises the steps: Step 1: Feed the floating coal slime into the mixing barrel, add water and a collector in the mixing barrel, and mix it into a slurry, which is then fed into the hydraulic flotation machine; Step 2: The clean water is supplied to the fluidization nozzle of the hydraulic flotation machine through the microbubble generator for primary classification. A buffer bucket; the coarse-grained gangue in the pulp is discharged through the bottom outlet of the hydraulic flotation machine; Step 3: Add water to the first buffer bucket, and after stirring evenly, feed it into the three-product cyclone classification screen for classification, the fine-grained slime and fine-grained slime enter the second buffer bucket, and the coarse-grained concentrate products are swirled by the three products. The bottom flow port of the grading screen is discharged; Step 4: The slurry in the second buffer barrel is pre-mineralized, and then fed into the flotation column for precise separation of fine-grained slime. 8 . The sorting and recovery process according to claim 7 , wherein in the second step, when clear water passes through the microbubble generator, air and a foaming agent are inhaled. 9 . 9 . The sorting and recycling process according to claim 8 , wherein the precise sorting of the fine-grained slime in the step 4 is as follows: the fine-grained slime and the bubbles rising in the flotation column form a countercurrent, 9 . Fine-grained clean coal with good surface hydrophobicity collides with air bubbles and floats up, and is collected and discharged from the overflow tank at the upper end of the flotation column; fine-grained gangue with poor surface hydrophobicity is discharged from the bottom of the flotation column. 10. The sorting and recycling process according to any one of claims 7-9, wherein in the step 1, the collector is one or a combination of two of kerosene and diesel.

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