Flotation system and flotation method

Abstract

The invention provides a flotation system and a flotation method. The flotation system comprises a flotation machine; the stirring barrel is communicated with the flotation machine, so that clean coal separated by the flotation machine enters the stirring barrel to be stirred; the first storage part is used for storing an organic solvent, and the first storage part is communicated with the stirring barrel so as to introduce the organic solvent into the stirring barrel, so that the clean coal and the organic solvent are mixed to form clean coal ore pulp; the filter press is communicated with the stirring barrel, so that the clean coal ore pulp is introduced into the filter press, and clean coal ore pulp filtrate water and solids are formed; the aeration tank is communicated with the filter press, so that clean coal ore pulp filtrate water is introduced into the aeration tank for aeration treatment, and upper-layer agent mixed liquid and circulating water are formed; and the distillation tower is communicated with the aeration tank so as to separate the upper-layer reagent mixed liquid into a circulating organic solvent and a circulating flotation reagent. The problem that in the prior art, a flotation reagent recycling mode is poor in recycling effect is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine flotation, and in particular to a flotation system and a flotation method. Background Art

[0002] Flotation is the most effective, economical and mature method for processing coal slime with a diameter of less than 0.5 mm. In the future, with the improvement of coal comprehensive mining level and the deterioration of coal quality, the amount of fine coal slime produced will further increase, and the importance of flotation will inevitably be further highlighted.

[0003] In the process of coal slime flotation, flotation reagents are the key factors to improve the floatability of combustible bodies and adjust the stability of bubbles. However, the cost of coal slime flotation has always been high. The cost of flotation operation is 3 to 5 times that of gravity separation operation, mainly due to the consumption of flotation reagents. Especially for coal slime with relatively poor floatability and low-grade coal slime, the consumption of reagents increases sharply, resulting in this part of coal slime can only be mixed with mixed coal for sale or dumped, resulting in a huge waste of resources.

[0004] In the existing coal slime flotation process, the research on reducing the consumption of coal slime flotation is mainly focused on the front stage of flotation, mainly through segmented dosing, forced and enhanced pulping, and the development of new high-efficiency reagents to reduce the consumption of flotation collectors. However, in the back stage of flotation, that is, after the clean coal and tailings are floated out, a large amount of collectors and frothers remaining in the water body have not been centrally recycled.

[0005] In the related art, the flotation method is used to recover the reagents remaining in the circulating water. However, the reagent content in the circulating water is relatively low, and the flotation reagents are mainly adsorbed on the surface of the clean coal. It can be seen that the existing method of recovering the flotation reagents using the flotation method has the problem of poor recovery effect. Summary of the invention

[0006] The main purpose of the present invention is to provide a flotation system and a flotation method to solve the problem of poor recovery effect of the flotation reagent recovery method in the prior art.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a flotation system is provided, comprising: a flotation machine; a stirring barrel connected to the flotation machine so that the clean coal sorted by the flotation machine enters the stirring barrel for stirring; a first storage component for storing an organic solvent, the first storage component being connected to the stirring barrel so that the organic solvent is introduced into the stirring barrel so that the clean coal and the organic solvent are mixed to form a clean coal slurry; a filter press connected to the stirring barrel so that the clean coal slurry is introduced into the filter press to form clean coal slurry filtrate water and solid matter; an aeration tank connected to the filter press so that the clean coal slurry filtrate water is introduced into the aeration tank for aeration treatment to form an upper reagent mixed liquid and circulating water; and a distillation tower connected to the aeration tank so that the upper reagent mixed liquid is separated into a circulating organic solvent and a circulating flotation reagent.

[0008] Furthermore, the flotation system further comprises: a first connecting pipe, the distillation tower has a first outlet, and both ends of the first connecting pipe are respectively connected to the first outlet and the first storage component to allow the circulating organic solvent to return to the first storage component.

[0009] Furthermore, the flotation system further comprises: a first condenser, which is arranged on the first connecting pipe so that the circulating organic solvent enters the first storage component after being condensed.

[0010] Furthermore, the flotation system also includes: a second storage component, a second connecting pipe, the distillation tower has a second outlet, and both ends of the second connecting pipe are respectively connected to the second outlet and the second storage component to send the circulating flotation agent into the second storage component for storage; wherein the second storage component is connected to the flotation machine to pass the circulating flotation agent into the flotation machine.

[0011] Furthermore, the flotation system further comprises: a second condenser, which is arranged on the second connecting pipe so that the circulating flotation reagent enters the second storage component after being condensed.

[0012] Furthermore, the flotation system also includes: a third storage component for storing flotation agents, the third storage component is connected to the flotation machine to provide flotation agents to the flotation machine; a third connecting pipe and a fourth connecting pipe, the two ends of the third connecting pipe are respectively connected to the third storage component and the flotation machine, and the two ends of the fourth connecting pipe are respectively connected to the third connecting pipe and the second storage component, so that both the flotation agents and the circulating flotation agents enter the flotation machine.

[0013] Furthermore, the flotation system further comprises: a pulp mixing device, which is arranged on the third connecting pipe and located between the flotation machine and the second connecting pipe, so that the circulating flotation reagent and the flotation reagent are mixed and processed by the pulp mixing device.

[0014] Furthermore, the flotation system also includes: a filtrate barrel, in which a stirring component is arranged, the filtrate barrel is connected with the filter press to store the clean coal slurry filtrate water, and the filtrate barrel is connected with the feed port of the aeration tank to pass the clean coal slurry filtrate water into the aeration tank.

[0015] According to another aspect of the present invention, a flotation method is provided, which is applicable to the above-mentioned flotation system, and the flotation method comprises: introducing flotation reagent and material into a flotation machine to separate the material into clean coal and tail coal through the flotation machine; sending the clean coal into a stirring barrel, and adding an organic solvent into the stirring barrel, and stirring the clean coal and the organic solvent through the stirring barrel to form clean coal slurry; wherein the amount of organic solvent added is greater than the amount of flotation reagent added; sending the clean coal slurry into a filter press for dehydration to form solid matter and filtrate water; the filtrate water is introduced into an aeration tank for aeration separation to form an upper reagent mixed liquid and circulating water; the upper reagent mixed liquid is introduced into a distillation tower to separate the circulating organic solvent and the circulating flotation reagent.

[0016] Further, the amount of the organic solvent added is 2 to 4 times the amount of the flotation reagent added; and / or the organic solvent is: ether and / or chloroform.

[0017] Applying the technical solution of the present invention, the present invention provides a flotation system, including: a flotation machine; a stirring barrel, the stirring barrel is connected with the flotation machine so that the clean coal sorted by the flotation machine enters the stirring barrel for stirring; a first storage component, used for storing an organic solvent, the first storage component is connected with the stirring barrel so that the organic solvent is introduced into the stirring barrel so that the clean coal and the organic solvent are mixed to form a clean coal slurry; a filter press, the filter press is connected with the stirring barrel so that the clean coal slurry is introduced into the filter press to form clean coal slurry filtrate water and solid matter; an aeration tank, the aeration tank is connected with the filter press so that the clean coal slurry filtrate water is introduced into the aeration tank for aeration treatment to form an upper reagent mixed liquid and circulating water; a distillation tower, the distillation tower is connected with the aeration tank so as to separate the upper reagent mixed liquid into a circulating organic solvent and a circulating flotation reagent. Through the above arrangement, the organic solvent can dissolve the flotation agent on the surface of the clean coal, so that the clean coal and the organic solvent are mixed to form a clean coal slurry, and then the upper agent mixture and circulating water are formed through aeration treatment in the aeration tank. The upper agent mixture is formed by mixing the organic solvent and the flotation agent, and then the upper agent mixture is separated into a circulating organic solvent and a circulating flotation agent through a distillation tower. In this way, the recycling of the organic solvent and the recycling of the flotation agent are realized, and the organic solvent can dissolve the flotation agent on the surface of the clean coal, which greatly improves the recovery amount of the flotation agent attached to the surface of the clean coal, improves the recovery effect of the flotation agent, and is conducive to building a recycling coal processing model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 It shows a schematic diagram of the overall structure of an embodiment of a flotation system according to the present invention;

[0020] Figure 2 A schematic flow chart of an embodiment of a flotation method according to the present invention is shown.

[0021] The above drawings include the following reference numerals:

[0022] 1. Flotation machine; 2. Mixing barrel; 3. First storage component; 4. Filter press; 5. Aeration tank; 6. Distillation tower; 100. First connecting pipe; 7. First condenser; 8. Second storage component; 9. Second condenser; 200. Second connecting pipe; 10. Third storage component; 300. Third connecting pipe; 11. Slurry mixing equipment; 12. Filtrate barrel; 400. Fourth connecting pipe; M. Circulating water tank. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] Please refer to Figure 1The present invention provides a flotation system, comprising: a flotation machine 1; a stirring barrel 2, the stirring barrel 2 is connected to the flotation machine 1, so that the clean coal sorted by the flotation machine 1 enters the stirring barrel 2 for stirring; a first storage component 3, used for storing an organic solvent, the first storage component 3 is connected to the stirring barrel 2, so that the organic solvent is introduced into the stirring barrel 2, so that the clean coal and the organic solvent are mixed to form a clean coal slurry; a filter press 4, the filter press 4 is connected to the stirring barrel 2, so that the clean coal slurry is introduced into the filter press 4 to form clean coal slurry filtrate water and solid matter; an aeration tank 5, the aeration tank 5 is connected to the filter press 4, so that the clean coal slurry filtrate water is introduced into the aeration tank 5 for aeration treatment, so as to form an upper reagent mixed liquid and circulating water; a distillation tower 6, the distillation tower is connected to the aeration tank 5, so as to separate the upper reagent mixed liquid into a circulating organic solvent and a circulating flotation reagent. Through the above arrangement, the organic solvent can dissolve the flotation agent on the surface of the clean coal, so that the clean coal and the organic solvent are mixed to form a clean coal slurry, and then the aeration treatment is carried out in the aeration tank 5 to form an upper agent mixed liquid and circulating water. The upper agent mixed liquid is formed by mixing the organic solvent and the flotation agent, and then the upper agent mixed liquid is separated into a circulating organic solvent and a circulating flotation agent through a distillation tower 6. In this way, the recycling of the organic solvent and the recycling of the flotation agent are realized, and the organic solvent can dissolve the flotation agent on the surface of the clean coal, which greatly improves the recovery amount of the flotation agent attached to the surface of the clean coal, improves the recovery effect of the flotation agent, and is conducive to building a recycling coal processing model.

[0025] Specifically, the first storage component 3 is an organic solvent barrel.

[0026] Specifically, the stirring barrel 2 has a stirring paddle.

[0027] In the embodiment of the present application, the circulating organic solvent and the circulating flotation reagent refer to the organic solvent and the flotation reagent formed by separation treatment in the aeration tank 5 and the distillation tower 6 .

[0028] In the embodiment of the present application, the flotation system further includes: a first connecting pipe 100, the distillation tower 6 has a first outlet, and both ends of the first connecting pipe 100 are respectively connected to the first outlet and the first storage component 3, so that the circulating organic solvent returns to the first storage component 3. Through the above arrangement, the storage of the circulating organic solvent is convenient.

[0029] Specifically, in order to ensure the formation of the circulating organic solvent, the flotation system further includes: a first condenser 7, which is arranged on the first connecting pipe 100, so that the circulating organic solvent enters the first storage part 3 after condensation. In this way, the vapor organic solvent flowing through the first condenser 7 is converted into a liquid organic solvent and enters the first storage part 3 for storage.

[0030] In the embodiment of the present application, the flotation system further includes: a second storage component 8, a second connecting pipe 200, the distillation tower 6 has a second outlet, and both ends of the second connecting pipe 200 are respectively connected to the second outlet and the second storage component 8 to send the circulating flotation reagent into the second storage component 8 for storage; wherein the second storage component 8 is connected to the flotation machine 1 to pass the circulating flotation reagent into the flotation machine 1. Through the above arrangement, the circulating flotation reagent can enter the flotation machine for repeated use, and through the arrangement of the second storage component 8, the storage and quantitative delivery of the circulating flotation reagent are convenient, ensuring the reliability of the use of the entire flotation system.

[0031] In order to ensure the formation of circulating flotation reagents, the flotation system further includes: a second condenser 9 , which is arranged on the second connecting pipe 200 so that the circulating flotation reagents enter the second storage component 8 after condensation.

[0032] In the embodiment of the present application, the first condenser 7 and the second condenser 9 are both carbon steel shell and tube condensers.

[0033] like Figure 1 As shown, the flotation system further includes: a third storage component 10 for storing flotation reagents, the third storage component 10 is connected to the flotation machine 1 to provide flotation reagents to the flotation machine 1; a third connecting pipe 300 and a fourth connecting pipe 400, the two ends of the third connecting pipe 300 are respectively connected to the third storage component 10 and the flotation machine 1, and the two ends of the fourth connecting pipe 400 are respectively connected to the third connecting pipe 300 and the second storage component 8, so that both the flotation reagents and the circulating flotation reagents enter the flotation machine 1. Through the above arrangement, the third storage component 10 and the second storage component 8 are arranged in parallel, and the flotation reagents stored in the third storage component 10 are the initial flotation reagents added at the beginning, and the initial flotation reagents and the circulating flotation reagents are stored separately, which is convenient for measuring and sampling the flotation reagents, thereby ensuring the accuracy of the amount taken.

[0034] In the embodiment of the present application, the second storage component and the third storage component are both storage buckets.

[0035] Optionally, in this embodiment, the second storage component 8 and the third storage component 10 are combined to store the flotation reagent, thereby respectively achieving metering and sampling of the flotation reagent.

[0036] In an embodiment of the present application, the flotation system further includes: a slurry mixing device 11, which is arranged on the third connecting pipe 300 and located between the flotation machine 1 and the second connecting pipe 200, so that the circulating flotation agent and the flotation agent are mixed and processed by the slurry mixing device 11. In this way, the flotation agent and the coal slime are fully mixed in the slurry mixing device 11 for pre-mineralization, which is beneficial to the processing of the material by the flotation agent.

[0037] Specifically, the flotation system further includes: a filtrate barrel 12, in which a stirring component is provided, the filtrate barrel 12 is connected with the filter press 4 to store clean coal slurry filtrate water, and the filtrate barrel 12 is connected with the feed port of the aeration tank 5 to pass the clean coal slurry filtrate water into the aeration tank 5. The clean coal slurry filtrate water formed by the filter press 4 is temporarily stored in the filtrate barrel 12 to prevent the subsequent equipment from carrying excessive clean coal slurry filtrate water, so as to ensure the reliability of the operation of the flotation system.

[0038] In an embodiment of the present application, the flotation system further includes a circulating water pool M, which is connected to the circulating water outlet of the aeration pool 5 so that the circulating water formed by the aeration pool 5 enters the circulating water pool M for storage.

[0039] Optionally, the circulating water formed by the treatment in the aeration tank 5 can be connected to the first condenser 7 through a connecting pipe, so that the circulating water is used as a cooling medium for the first condenser 7; the circulating water formed by the treatment in the aeration tank 5 can be connected to the second condenser 9 through a connecting pipe, so that the circulating water is used as a cooling medium for the second condenser 9. Through the above arrangement, the recycling of the circulating water can be achieved to further achieve energy saving and emission reduction.

[0040] Optionally, the circulating water pool M is connected to the first condenser 7 and / or the second condenser 9 through a connecting pipe, so that the circulating water in the circulating water pool M is sent into the first condenser 7 and / or the second condenser 9.

[0041] Please refer to Figure 2 The present invention also provides a flotation method, which is applicable to the above-mentioned flotation system. The flotation method comprises: introducing flotation reagents and materials (equivalent to Figure 2 The flotation feed in the flotation machine 1 is used to separate the materials into clean coal and tail coal; the clean coal is fed into the stirring barrel 2, and the organic solvent is added into the stirring barrel 2, and the clean coal and the organic solvent are stirred by the stirring barrel 2 to form clean coal slurry; wherein, the amount of organic solvent added is greater than the amount of flotation reagent added to ensure that the organic solvent can completely adsorb the flotation reagent on the surface of the clean coal; the clean coal slurry is fed into the filter press 4 for dehydration to form solid matter and filtrate water; the filtrate water is passed into the aeration tank 5 for aeration separation to form an upper reagent mixed liquid and circulating water; the upper reagent mixed liquid is passed into the distillation tower 6 to separate the circulating organic solvent and the circulating flotation reagent. Through the above process, the recycling of organic solvent and flotation reagent can be realized, and energy saving and emission reduction are achieved.

[0042] Specifically, Figure 2 The slurry preparer is a slurry mixing device 11.

[0043] In this application, the material is coal slime.

[0044] In the embodiment of the present application, the distillation tower 6 is a low-temperature distillation tank, the working temperature of the low-temperature distillation tank is between 50° C. and 100° C., and the working pressure is normal pressure.

[0045] In this embodiment, the tailing coal formed after sorting by the flotation machine 1 has a very low concentration, and is then sent to a concentrator for removal.

[0046] Optionally, the amount of organic solvent added is 2 to 4 times the amount of flotation agent added to ensure that the organic solvent can completely adsorb the flotation agent on the surface of the clean coal.

[0047] Since the flotation agent is hydrocarbon oil, in the embodiment of the present application, the organic solvent is: a drug that is soluble in hydrocarbon oil and has a certain polarity.

[0048] In the embodiment of the present application, the organic solvent is ether and / or chloroform, so that the organic solvent can be compatible with the flotation reagent. The flotation reagent exists on the surface of the clean coal in molecular form, which provides good conditions for recovering the flotation reagent.

[0049] In the embodiment of the present application, an organic solvent (ether) is added to a mixing barrel 2 at a dosage of 1800 g / t of raw coal; after dehydration by two KXGZ650 / 200-U filter presses 4, the clean coal slurry filtrate water is collected in a filtrate barrel 12 of Φ5000 mm; the filtrate is pumped to a blast aeration tank (aeration tank 5) through a first driving pump, and the effective volume of aeration tank 5 is 50 m 3 , aeration volume is 1m 3 / min.m 2 The upper layer of aeration tank 5 is rich in organic solvent and flotation agent foam (upper agent mixture), and the upper agent mixture enters 2 sets of 5m 3 The electrothermal distillation kettle (distillation tower) has an organic solvent as the extract of the distillation kettle, and the cross-sectional area of ​​the distillation kettle extract is 10m 2 The first condenser 7 is cooled and then returned to the organic solvent barrel (first storage component 3); the residue in the still is a flotation reagent, and the residue in the still passes through a cross-sectional area of ​​10m 2 After cooling in the second condenser 9, it returns to the circulating reagent barrel (second storage component 8) and adds two XK-500 slurry preparation devices; the circulating water produced in the aeration tank returns to the circulating water pool, and a part of the circulating water in the circulating water pool is diverted to the carbon steel tube condenser (first condenser 7 and second condenser 9) as a cooling medium, and the rest is all used as circulating water. After adopting the above process, the overall flotation reagent consumption is reduced by more than 30%.

[0050] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0051] The present invention provides a flotation system, comprising: a flotation machine 1, a stirring barrel 2, the stirring barrel 2 is connected with the flotation machine 1, so that the clean coal sorted by the flotation machine 1 enters the stirring barrel 2 for stirring; a first storage component 3, used for storing an organic solvent, the first storage component 3 is connected with the stirring barrel 2, so that the organic solvent is introduced into the stirring barrel 2, so that the clean coal and the organic solvent are mixed to form clean coal slurry; a filter press 4, the filter press 4 is connected with the stirring barrel 2, so that the clean coal slurry is introduced into the filter press 4, so as to form clean coal slurry filtrate water and solid matter; an aeration tank 5, the aeration tank 5 is connected with the filter press 4, so that the clean coal slurry filtrate water is introduced into the aeration tank 5 for aeration treatment, so as to form an upper reagent mixed liquid and circulating water; a distillation tower 6, the distillation tower is connected with the aeration tank 5, so as to separate the upper reagent mixed liquid into a circulating organic solvent and a circulating flotation reagent. Through the above arrangement, the organic solvent can dissolve the flotation agent on the surface of the clean coal, so that the clean coal and the organic solvent are mixed to form a clean coal slurry, and then the aeration treatment is carried out in the aeration tank 5 to form an upper agent mixed liquid and circulating water. The upper agent mixed liquid is formed by mixing the organic solvent and the flotation agent, and then the upper agent mixed liquid is separated into a circulating organic solvent and a circulating flotation agent through a distillation tower 6. In this way, the recycling of the organic solvent and the recycling of the flotation agent are realized, and the organic solvent can dissolve the flotation agent on the surface of the clean coal, which greatly improves the recovery amount of the flotation agent attached to the surface of the clean coal, improves the recovery effect of the flotation agent, and is conducive to building a recycling coal processing model.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flotation system, characterized in that: include: Flotation machine (1); a stirring barrel (2), the stirring barrel (2) being connected to the flotation machine (1) so that the clean coal separated by the flotation machine (1) enters the stirring barrel (2) for stirring; a first storage component (3) for storing an organic solvent, wherein the first storage component (3) is in communication with the stirring barrel (2) so as to allow the organic solvent to flow into the stirring barrel (2) so as to mix the clean coal and the organic solvent to form a clean coal slurry; A filter press (4), the filter press (4) being in communication with the stirring barrel (2) so as to pass the clean coal slurry into the filter press (4) to form clean coal slurry filtrate water and solid matter; an aeration tank (5), wherein the aeration tank (5) is connected to the filter press (4) so ​​as to pass the clean coal slurry filtrate water into the aeration tank (5) for aeration treatment to form an upper layer of reagent mixed liquid and circulating water; A distillation tower (6) is connected to the aeration tank (5) to separate the upper reagent mixed liquid into a circulating organic solvent and a circulating flotation reagent.

2. The flotation system according to claim 1, characterized in that: The flotation system further comprises: A first connecting pipe (100), the distillation tower (6) has a first outlet, and both ends of the first connecting pipe (100) are respectively connected to the first outlet and the first storage component (3) so that the circulating organic solvent returns to the first storage component (3).

3. The flotation system according to claim 2, characterized in that: The flotation system further comprises: A first condenser (7), wherein the first condenser (7) is arranged on the first connecting pipe (100) so that the circulating organic solvent enters the first storage component (3) after being condensed.

4. The flotation system according to claim 1, characterized in that: The flotation system further comprises: a second storage component (8), a second connecting pipe (200), the distillation tower (6) having a second outlet, and two ends of the second connecting pipe (200) being respectively connected to the second outlet and the second storage component (8) so as to send the circulating flotation reagent into the second storage component (8) for storage; Wherein, the second storage component (8) is connected to the flotation machine (1) so as to pass the circulating flotation reagent into the flotation machine (1).

5. The flotation system according to claim 4, characterized in that: The flotation system further comprises: A second condenser (9), wherein the second condenser (9) is arranged on the second connecting pipe (200) so that the circulating flotation reagent enters the second storage component (8) after being condensed.

6. The flotation system according to claim 4, characterized in that: The flotation system further comprises: A third storage component (10) for storing a flotation agent, wherein the third storage component (10) is connected to the flotation machine (1) to provide the flotation agent to the flotation machine (1); A third connecting pipe (300) and a fourth connecting pipe (400), wherein both ends of the third connecting pipe (300) are connected to the third storage component (10) and the flotation machine (1), respectively, and both ends of the fourth connecting pipe (400) are connected to the third connecting pipe (300) and the second storage component (8), respectively, so that both the flotation reagent and the circulating flotation reagent enter the flotation machine (1).

7. The flotation system according to claim 6, characterized in that: The flotation system further comprises: A pulping device (11), the pulping device (11) is arranged on the third connecting pipe (300) and is located between the flotation machine (1) and the second connecting pipe (200), so that the circulating flotation reagent and the flotation reagent are mixed and treated by the pulping device (11).

8. The flotation system according to any one of claims 1 to 7, characterized in that: The flotation system further comprises: A filtrate barrel (12), wherein a stirring component is arranged inside the filtrate barrel (12), the filtrate barrel (12) is connected to the filter press (4) to store the clean coal slurry filtrate water, and the filtrate barrel (12) is connected to the feed port of the aeration tank (5) to pass the clean coal slurry filtrate water into the aeration tank (5).

9. A flotation method, applicable to the flotation system according to any one of claims 1 to 8, characterized in that: The flotation method comprises: A flotation agent and a material are introduced into a flotation machine (1) so as to separate the material into clean coal and tail coal through the flotation machine (1); The clean coal is fed into a stirring barrel (2), and an organic solvent is added into the stirring barrel (2), and the clean coal and the organic solvent are stirred by the stirring barrel (2) to form a clean coal slurry; wherein the amount of the organic solvent added is greater than the amount of the flotation agent added; The clean coal slurry is sent to a filter press (4) for dehydration to form solid matter and filtrate water; The filtrate water is passed into an aeration tank (5) for aeration separation to form an upper layer of reagent mixed liquid and circulating water; The upper reagent mixed liquid is introduced into a distillation tower (6) to separate the circulating organic solvent and the circulating flotation reagent.

10. The flotation method according to claim 9, characterized in that: The amount of the organic solvent added is 2 to 4 times the amount of the flotation reagent added; and / or, The organic solvent is: ether and / or chloroform.

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