Flotation clean coal-based pilot plant test production line and flotation clean coal ash content detection method

Abstract

The invention relates to a pilot production line based on flotation clean coal and a flotation clean coal ash content detection method.The pilot production line comprises first-stage flotation equipment, second-stage flotation equipment, third-stage flotation equipment and fourth-stage flotation equipment, and the first-stage flotation equipment and the second-stage flotation equipment conduct flotation through mechanical stirring type flotation machines; the third-stage flotation equipment and the fourth-stage flotation equipment conduct flotation through flotation columns, flotation machines are used in the first-stage flotation and the second-stage flotation so that the product yield of the pilot production line can be improved, and flotation columns are used in the third-stage flotation and the fourth-stage flotation so that the ash content of flotation clean coal obtained by the pilot production line can be reduced. The ultra-low ash coal with the ash content smaller than 1% is prepared through four times of flotation of low-rank coal, the ash content detection method achieves rapid detection of the ash content of the clean coal through the relation between the ash content of the flotation clean coal prepared through flotation equipment and the filtering time of the flotation clean coal, the drying and firing time needed by conventional ash content detection operation is omitted, and the ash content detection efficiency is improved. And the debugging time of a pilot production line is effectively reduced.

Description

Technical Field

[0001] The invention relates to the field of ultra-low ash coal preparation, in particular to a pilot production line based on flotation clean coal and a flotation clean coal ash content detection method. Background Art

[0002] There is no industrial application case of using low-rank coal to prepare ultra-low ash coal with an ash content of less than 1% at home and abroad. Flotation is a commonly used method for recovering fine-grained coal. However, laboratory flotation equipment cannot simulate the complex production environment during industrial application, and cannot achieve continuous production. Therefore, the data obtained on laboratory equipment has great limitations in guiding industrial production. Therefore, in order to reduce the technical risks faced by the construction of the aforementioned ultra-low ash coal industrial production line, it is necessary to develop a pilot production line based on laboratory equipment to provide industrial application guidance for the flotation of low-rank coal to produce ultra-low ash coal with an ash content of less than 1%. At the same time, the conventional multiple flotation pilot production line cannot reflect the production indicators of each production unit in real time during use. During debugging, a large amount of materials and time are required to ensure that the system is in the best state, which consumes manpower and material resources and is not conducive to the rapid transformation of technological achievements. The cost of using an online coal quality analyzer is high, and the software parameters of the coal quality analyzer need to be deeply adjusted according to the coal quality. Therefore, it is also necessary to form a new method to achieve semi-quantitative rapid detection of flotation product indicators of the pilot production line. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a pilot production line based on flotation clean coal and a flotation clean coal ash detection method to solve the technical problems involved in the above-mentioned background technology.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A pilot production line based on flotation clean coal, comprising a primary flotation device, a secondary flotation device, a tertiary flotation device, a quaternary flotation device and a clean coal dehydration device;

[0006] The primary flotation equipment includes a No. 1 slurry mixing barrel, a surface modifier, a No. 1 mechanical agitation flotation machine, a collector dosing machine for adding reagents to the surface modifier, a frother dosing machine for adding frothers to the surface modifier, and a No. 1 flotation clean coal defoamer for spraying clean water to the No. 1 mechanical agitation flotation machine, a No. 1 slurry pump is arranged between the No. 1 slurry mixing barrel and the surface modifier, and a No. 2 slurry pump is arranged between the surface modifier and the No. 1 mechanical agitation flotation machine;

[0007] The secondary flotation equipment includes a No. 2 slurry mixing barrel, a No. 2 mechanical agitation flotation machine, and a No. 2 flotation clean coal defoamer for spraying clean water to the No. 2 mechanical agitation flotation machine. A No. 3 slurry pump is arranged between the No. 2 slurry mixing barrel and the No. 1 mechanical agitation flotation machine, and a No. 4 slurry pump is arranged between the No. 2 slurry mixing barrel and the No. 2 mechanical agitation flotation machine.

[0008] The three-stage flotation equipment includes a No. 3 slurry mixing barrel, a No. 1 flotation column, and a No. 3 flotation clean coal defoamer for spraying clean water to the No. 1 flotation column. A No. 5 slurry pump is arranged between the No. 3 slurry mixing barrel and the secondary mechanical stirring flotation machine, and a No. 6 slurry pump is arranged between the No. 3 slurry mixing barrel and the primary flotation column.

[0009] The four-stage flotation equipment includes a No. 4 slurry mixing barrel, a No. 2 flotation column, and a No. 4 flotation clean coal defoamer for spraying clean water to the No. 2 flotation column. A No. 7 slurry pump is arranged between the No. 4 slurry mixing barrel and the first flotation column, and a No. 8 slurry pump is arranged between the No. 4 slurry mixing barrel and the second flotation column.

[0010] A No. 9 slurry pump is arranged between the clean coal dehydration equipment and the secondary flotation column.

[0011] In the above invention content, further, the pilot production line based on flotation clean coal also includes tailings coal collecting equipment, which includes a No. 10 slurry pump, a tailings buffer bucket and a tailings coal dewatering equipment; the No. 1 mechanical agitation flotation machine, the No. 2 mechanical agitation flotation machine, the No. 1 flotation column and the flotation tailings coal discharge port of the No. 2 flotation column are connected to the No. 10 slurry pump, and a No. 11 slurry pump is arranged between the tailings buffer bucket and the tailings coal dewatering equipment.

[0012] In the above invention content, further, the pilot production line based on flotation clean coal also includes a movable slurry circulation pool, and the movable slurry circulation pool includes a pool body made of a square steel frame, and the pool body has a conical bottom, and the conical bottom is connected to a circulation pool slurry pump, and a stirring structure is arranged inside the pool body, and a flotation clean coal inlet and a flotation tail coal inlet are arranged on the pool body, and a self-locking roller is arranged at the bottom of the pool body.

[0013] In the above invention content, further, the bottom of the No. 1 slurry mixing barrel, No. 2 slurry mixing barrel, No. 3 slurry mixing barrel, No. 4 slurry mixing barrel, surface modifier, pool body and tailings buffer barrel is a conical bottom of a cone or a quadrangular pyramid, and the angle between the conical slope of the conical bottom and the horizontal plane is greater than 35° and less than 65°.

[0014] In the above invention, further, the conical bottom is provided with a discharge outlet, and the diameter of the discharge outlet is not less than 10% of the diameter of the non-conical section.

[0015] A method for detecting ash content of flotation clean coal produced by a pilot production line of flotation clean coal is implemented by the following method:

[0016] Take 50g of the prepared flotation clean coal slurry and quickly pour it into the Buchner funnel, and start timing at the same time. When the moisture on the surface of the filter cake completely disappears, record the time T, and calculate the ash percentage A of the flotation clean coal by the formula;

[0017] The calculation formula for the ash percentage of the flotation clean coal slurry produced by the No. 1 mechanical agitation flotation machine is:

[0018] T = 0.37*A + 10.32;

[0019] The calculation formula for the ash percentage of the flotation clean coal slurry produced by the No. 2 mechanical agitation flotation machine is:

[0020] T = 0.59*A + 3.96;

[0021] The calculation formula for the ash percentage of the flotation clean coal slurry obtained by the No. 1 flotation column or the No. 2 flotation column is:

[0022] T = 1.5*A-0.33;

[0023] Among them, the Büchner funnel is a 95-hole round Büchner funnel with a funnel volume of 100 ml, an inner diameter of 55 mm, a filter hole inner diameter of 1.5 mm, and a filter paper that meets the GB / T 1914-2017 standard. The filtration pressure is 0.08 MPa.

[0024] The beneficial effects of the present invention are:

[0025] The pilot production line of the present invention realizes the preparation of ultra-low ash coal with an ash content of less than 1% by four flotation of low-rank coal using two flotation machines and two flotation columns. Secondly, the present invention uses a movable slurry circulation pool to assist in determining the optimal operating parameters of the flotation equipment, which is conducive to reducing the equipment debugging time and also helps to reduce the consumption of coal samples, water, electricity, reagents and other materials during the equipment debugging process. Finally, the ash content detection method of the flotation clean coal provided by the present invention realizes the rapid detection of the ash content of the clean coal by utilizing the connection between the ash content of the flotation clean coal obtained by each flotation equipment and its filtration time, eliminating the drying and burning time required for conventional ash content detection operations, and effectively reducing the debugging time of the pilot production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 It is a work flow chart of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the movable slurry circulation pool of the present invention;

[0029] Figure 4 This is a schematic diagram of a conical bottom structure in an embodiment of the present invention;

[0030] Figure 5 This is a corresponding relationship diagram between the ash content of the primary flotation clean coal and the filtration time of the present invention;

[0031] Figure 6 The figure is a corresponding relationship diagram between the ash content of the secondary flotation clean coal and the filtration time of the present invention;

[0032] Figure 7 The figure is a corresponding relationship diagram between the ash content of the tertiary or quadruple clean coal and the filtration time of the present invention.

[0033] In the figure, 1-No. 1 slurry mixing barrel, 2-surface modification machine, 3-No. 1 mechanical stirring flotation machine, 4-No. 2 slurry mixing barrel, 5-No. 2 mechanical stirring flotation machine, 6-No. 3 slurry mixing barrel, 7-No. 1 flotation column, 8-No. 4 slurry mixing barrel 8, 9-No. 2 flotation column, 10-clean coal dehydration equipment, 11-tailings buffer barrel, 12-tailings dehydration equipment, 13-collector dosing machine, 14-foaming agent dosing machine, 15-No. 1 slurry pump, 16-No. 2 slurry pump, 17-No. 3 slurry pump, 18-No. 4 slurry pump, 19-No. 5 slurry pump , 20-No. 6 slurry pump, 21-No. 7 slurry pump, 22-No. 8 slurry pump, 23-No. 9 slurry pump, 24-No. 10 slurry pump, 25-No. 11 slurry pump, 26-No. 1 flotation clean coal defoamer, 27-No. 2 flotation clean coal defoamer, 28-No. 3 flotation clean coal defoamer, 29-No. 4 flotation clean coal defoamer, 30-movable slurry circulation pool, 301-pool body, 302-circulation pool slurry pump, 303-stirring structure, 304-flotation clean coal feed port, 305-flotation tail coal feed port, 306-self-locking roller. DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0035] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0036] Embodiment 1:

[0037] A pilot production line based on flotation clean coal, see attached Figure 1 and attached Figure 2 As shown, it includes a primary flotation device, a secondary flotation device, a tertiary flotation device, a quaternary flotation device and a clean coal dehydration device 10; the primary flotation device includes a No. 1 slurry mixing barrel 1, a surface modifier 2, a No. 1 mechanical agitation flotation machine 3, a collector dosing machine 13 for adding reagents to the surface modifier 2, a frother dosing machine 14 for adding frothers to the surface modifier 2, and a No. 1 flotation clean coal defoamer 26 for spraying clean water to the No. 1 mechanical agitation flotation machine 3, a No. 1 slurry pump 15 is arranged between the No. 1 slurry mixing barrel 1 and the surface modifier 2, and a No. 2 slurry pump 16 is arranged between the surface modifier 2 and the No. 1 mechanical agitation flotation machine 3. During the operation, the low-rank coal sample used for the test is mixed with water in the No. 1 slurry mixing barrel 1 to form a relatively uniform and stable flotation pulp, which is used to simulate the flotation feed pulp in actual industrial production. The mixed pulp is sent to the surface modification machine 2 by the No. 1 slurry pump 15 for surface modification. At the same time, the collector dosing machine 13 and the frother dosing machine 14 add reagents to the surface modification machine 2 to complete the surface modification of the flotation pulp; the flotation pulp after surface modification is pumped to the No. 1 mechanical stirring flotation machine 3 by the No. 2 slurry pump 16 for the first flotation operation. During the operation, the No. 1 flotation clean coal defoamer 26 sprays a small amount of clean water on the surface of the flotation clean coal to reduce the ash content of the flotation clean coal. The pulp that completes the first flotation operation is sent to the secondary flotation equipment for secondary flotation.

[0038] The secondary flotation equipment includes a No. 2 slurry mixing barrel 4, a No. 2 mechanical agitation flotation machine 5, and a No. 2 flotation clean coal defoamer 27 for spraying clean water on the No. 2 mechanical agitation flotation machine 5. A No. 3 slurry pump 17 is arranged between the No. 2 slurry mixing barrel 4 and the No. 1 mechanical agitation flotation machine 3, and a No. 4 slurry pump 18 is arranged between the No. 2 slurry mixing barrel 4 and the No. 2 mechanical agitation flotation machine 5. The slurry after the first flotation operation is sent to the No. 2 slurry mixing barrel 4 for slurry mixing through the No. 3 slurry pump 17, and then sent to the No. 2 mechanical agitation flotation machine 5 for the second flotation operation through the No. 4 slurry pump 18. During the operation, the No. 2 flotation clean coal defoamer 27 sprays a small amount of clean water on the surface of the flotation clean coal to reduce the ash content of the flotation clean coal. The flotation clean coal obtained from the second flotation operation is continuously sent to the tertiary flotation equipment for the third flotation operation.

[0039] The three-stage flotation equipment includes a No. 3 slurry mixing barrel 6, a No. 1 flotation column 7, and a No. 3 flotation clean coal defoamer 28 for spraying clean water on the No. 1 flotation column 7. A No. 5 slurry pump 19 is arranged between the No. 3 slurry mixing barrel 6 and the secondary mechanical stirring flotation machine 5, and a No. 6 slurry pump 20 is arranged between the No. 3 slurry mixing barrel 6 and the primary flotation column 7. The slurry after the secondary flotation operation is sent to the No. 3 slurry mixing barrel 6 for slurry mixing through the No. 5 slurry pump 19, and then sent to the No. 1 flotation column for the third flotation operation through the No. 6 slurry pump 20. During the operation, the No. 3 flotation clean coal defoamer 28 sprays a small amount of clean water on the surface of the flotation clean coal to reduce the ash content of the flotation clean coal. The flotation clean coal obtained from the third flotation operation is continuously sent to the fourth-stage flotation equipment for the third flotation operation.

[0040] The four-stage flotation equipment includes a No. 4 slurry mixing barrel 8, a No. 2 flotation column 9, and a No. 4 flotation clean coal defoamer 29 for spraying clean water to the No. 2 flotation column 9. A No. 7 slurry pump 21 is provided between the No. 4 slurry mixing barrel 8 and the first flotation column 7, and an No. 8 slurry pump 22 is provided between the No. 4 slurry mixing barrel 8 and the second flotation column 9. The slurry after three flotation operations is sent to the No. 4 slurry mixing barrel 8 for slurry mixing through the No. 7 slurry pump 21, and then sent to the No. 2 flotation column 9 for the fourth flotation operation through the No. 8 slurry pump 22. The slurry after the fourth flotation operation is sent to the clean coal dehydration equipment 10 through the No. 9 slurry pump 23, and the clean coal dehydration operation is performed in the clean coal dehydration equipment 10, and the obtained solid product is an ultra-low ash coal with an ash content of less than 1%. In the present invention, two flotation machines are arranged to perform the first and second flotation operations, which is beneficial to improving the product yield of the pilot production line. The use of flotation columns in the third and fourth flotation operations is beneficial to reducing the ash content of the floated clean coal obtained by the pilot production line.

[0041] Furthermore, the pilot production line based on flotation clean coal provided by the present invention also includes a tailings coal collection device. Specifically, the tailings coal collection device includes a No. 10 slurry pump 24, a tailings buffer barrel 11 and a tailings coal dewatering device 12. The flotation tailings coal discharge ports of the No. 1 mechanical agitation flotation machine 3, the No. 2 mechanical agitation flotation machine 5, the No. 1 flotation column 7 and the No. 2 flotation column 9 are all connected to the No. 10 slurry pump 24, and a No. 11 slurry pump 25 is arranged between the tailings buffer barrel 11 and the tailings coal dewatering device 12. The tailings slurry after flotation by the No. 1 mechanical agitation flotation machine 3, the No. 2 mechanical agitation flotation machine 5, the No. 1 flotation column 7 and the No. 2 flotation column 9 is sent to the tailings buffer barrel 11 by the No. 10 slurry pump 24. When the tailings buffer barrel 11 accumulates to a certain amount, it is pumped to the tailings coal dewatering device 12 by the No. 11 slurry pump 25 for tailings coal dewatering operation, and the solid product obtained is the tailings coal product.

[0042] Furthermore, the pilot production line based on flotation clean coal provided by the present invention also includes a movable slurry circulation pool 30, and the movable slurry circulation pool 30 includes a pool body 301 made of a square steel frame, and the pool body 301 has a conical bottom, and the conical bottom is connected to a circulation pool slurry pump 302, and a stirring structure 303 is arranged inside the pool body 301, and a flotation clean coal feed port 304 and a flotation tail coal feed port 305 are arranged on the pool body 301, and a self-locking roller 306 is arranged at the bottom of the pool body 301. Before the pilot production line is produced, the No. 1 mechanical stirring flotation machine 3, the No. 2 mechanical stirring flotation machine 5, the first flotation column 7 and the No. 2 flotation column 9 need to be debugged to determine their optimal operating parameters, and the debugging operation needs to be carried out. Figure 3 The movable slurry circulation pool shown is used to circulate and buffer the slurry. Take the commissioning of the No. 1 mechanical stirring flotation machine 3 as an example. When debugging the No. 1 mechanical agitation flotation machine 3, the slurry after surface modification in the surface modification machine 2 is sent into the tank body 301, and then sent into the No. 1 mechanical agitation flotation machine 3 through the circulating tank slurry pump 302 for flotation operation, and a small amount of flotation clean coal slurry and flotation tailing coal slurry are taken for testing and analysis to determine whether the ash percentage of the slurry meets the primary flotation standard. If it does not meet the standard, the flotation clean coal slurry and flotation tailing coal slurry in the No. 1 mechanical agitation flotation machine 3 are returned to the movable slurry circulation tank 30 through the flotation clean coal feed port 304 and the flotation tailing coal feed port 305, and after mixing in the tank body 301, they are pumped back to the No. 1 mechanical agitation flotation machine 3 for flotation by the circulating tank slurry pump 302 again; repeat the above operation and change the equipment operating parameters until the ash percentage of the slurry meets the flotation standard. After determining the optimal parameters of the No. 1 mechanical agitation flotation machine 3, the slurry in the movable slurry circulation pool 30 is replaced with the slurry in the No. 2 slurry mixing barrel 4, the No. 3 slurry mixing barrel 6, and the No. 4 slurry mixing barrel 8 in turn, and the above-mentioned operations are repeated to debug the No. 2 mechanical agitation flotation machine 5, the No. 1 flotation column 7, and the No. 2 flotation column 9 until all the flotation equipment reaches the optimal operating parameters.

[0043] In the above embodiment, as a preferred embodiment, refer to the attached Figure 4 As shown, the bottom of the No. 1 slurry mixing barrel 1, the No. 2 slurry mixing barrel 4, the No. 3 slurry mixing barrel 6, the No. 4 slurry mixing barrel 8, the surface modification machine 2, the tank body 301 and the tailings buffer barrel 11 are designed as a conical bottom of a circular cone or a quadrangular pyramid. The angle between the conical slope of the conical bottom and the horizontal plane is greater than 35°, which is convenient for the coarse particles in the slurry to be discharged from the equipment along the slope after settling. The angle between the conical slope of the conical bottom and the horizontal plane is less than 65°, which is conducive to reducing the concentration effect of the conical bottom and reducing the probability of pipeline blockage. A discharge outlet is set at the bottom of the conical section, and the diameter of the discharge outlet is not less than 10% of the diameter of the non-conical section, which is conducive to reducing the probability of pipeline blockage. The conical bottom is provided with a discharge outlet.

[0044] In summary, in this embodiment, the pilot production line uses two flotation machines and two flotation columns to prepare ultra-low ash coal with an ash content of less than 1% by flotation of low-rank coal four times. Secondly, the present invention uses a movable slurry circulation pool to assist in determining the optimal operating parameters of the flotation equipment, which is conducive to reducing the equipment debugging time and also helps to reduce the consumption of coal samples, water, electricity, reagents and other materials during the equipment debugging process.

[0045] Embodiment 2:

[0046] A method for detecting ash content of clean coal produced by a pilot production line for flotation clean coal is used to detect the ash percentage content in the clean coal slurry during the four flotation processes in Example 1, so that the first mechanical agitation flotation machine 3, the second mechanical agitation flotation machine 5, the first flotation column 7 and the second flotation column 9 can be quickly adjusted to the optimal operating parameters. The detection method is implemented by the following method.

[0047] Take 50g of the prepared flotation clean coal slurry and quickly pour it into the Buchner funnel, and start timing at the same time. When the moisture on the surface of the filter cake completely disappears, record the time T, and calculate the flotation clean coal ash percentage A by the formula. Figure 5 The relationship between the percentage of ash content of clean coal and the filtration time in a flotation process is shown in the figure. By fitting the results, the calculation formula for the ash percentage of the flotation clean coal slurry obtained by the No. 1 mechanical stirring flotation machine 3 is obtained as follows:

[0048] T = 0.37*A + 10.32;

[0049] The calculation formula for the ash percentage of the flotation clean coal slurry produced by the No. 2 mechanical stirring flotation machine 5 is:

[0050] T = 0.59*A + 3.96;

[0051] The calculation formula for the ash percentage of the flotation clean coal slurry obtained by the No. 1 flotation column 7 or the No. 2 flotation column 9 is:

[0052] T = 1.5*A-0.33;

[0053] Among them, in the above-mentioned testing process, the Büchner funnel is a 95-hole circular Büchner funnel with a funnel capacity of 100 ml, an inner diameter of 55 mm, a filter hole inner diameter of 1.5 mm, and a filter paper that complies with the GB / T 1914-2017 standard, with a filtration pressure of 0.08 MPa.

[0054] The clean coal ash percentage content detection method provided in this embodiment can quickly obtain the ash content result through the correspondence between the filtration time and the ash content, thereby realizing the rapid detection of the clean coal ash content, eliminating the drying and burning time required for conventional ash detection operations, and effectively reducing the debugging time of the pilot production line.

[0055] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A pilot production line based on flotation clean coal, characterized in that: Including primary flotation equipment, secondary flotation equipment, tertiary flotation equipment, quaternary flotation equipment and clean coal dehydration equipment; The primary flotation equipment includes a No. 1 slurry mixing barrel, a surface modifier, a No. 1 mechanical agitation flotation machine, a collector dosing machine for adding reagents to the surface modifier, a frother dosing machine for adding frothers to the surface modifier, and a No. 1 flotation clean coal defoamer for spraying clean water to the No. 1 mechanical agitation flotation machine, a No. 1 slurry pump is arranged between the No. 1 slurry mixing barrel and the surface modifier, and a No. 2 slurry pump is arranged between the surface modifier and the No. 1 mechanical agitation flotation machine; The secondary flotation equipment includes a No. 2 slurry mixing barrel, a No. 2 mechanical agitation flotation machine, and a No. 2 flotation clean coal defoamer for spraying clean water to the No. 2 mechanical agitation flotation machine. A No. 3 slurry pump is arranged between the No. 2 slurry mixing barrel and the No. 1 mechanical agitation flotation machine, and a No. 4 slurry pump is arranged between the No. 2 slurry mixing barrel and the No. 2 mechanical agitation flotation machine. The three-stage flotation equipment includes a No. 3 slurry mixing barrel, a No. 1 flotation column, and a No. 3 flotation clean coal defoamer for spraying clean water to the No. 1 flotation column. A No. 5 slurry pump is arranged between the No. 3 slurry mixing barrel and the secondary mechanical stirring flotation machine, and a No. 6 slurry pump is arranged between the No. 3 slurry mixing barrel and the primary flotation column. The four-stage flotation equipment includes a No. 4 slurry mixing barrel, a No. 2 flotation column, and a No. 4 flotation clean coal defoamer for spraying clean water to the No. 2 flotation column. A No. 7 slurry pump is arranged between the No. 4 slurry mixing barrel and the first flotation column, and a No. 8 slurry pump is arranged between the No. 4 slurry mixing barrel and the second flotation column. A No. 9 slurry pump is arranged between the clean coal dehydration equipment and the secondary flotation column.

2. A pilot production line based on flotation clean coal according to claim 1, characterized in that: The pilot production line based on flotation clean coal also includes tailings coal collecting equipment, which includes a No. 10 slurry pump, a tailings buffer bucket and a tailings coal dewatering equipment; the flotation tailings coal discharge ports of the No. 1 mechanical agitation flotation machine, the No. 2 mechanical agitation flotation machine, the No. 1 flotation column and the No. 2 flotation column are connected to the No. 10 slurry pump, and a No. 11 slurry pump is arranged between the tailings buffer bucket and the tailings coal dewatering equipment.

3. A pilot production line based on flotation clean coal according to claim 2, characterized in that: The pilot production line based on flotation clean coal also includes a movable slurry circulation pool, which includes a pool body made of a square steel frame, the pool body has a conical bottom, the conical bottom is connected to a circulation pool slurry pump, a stirring structure is arranged inside the pool body, a flotation clean coal inlet and a flotation tail coal inlet are arranged on the pool body, and a self-locking roller is arranged at the bottom of the pool body.

4. A pilot production line based on flotation clean coal according to claim 3, characterized in that: The bottoms of the No. 1 slurry mixing barrel, No. 2 slurry mixing barrel, No. 3 slurry mixing barrel, No. 4 slurry mixing barrel, surface modifier, pool body and tailings buffer barrel are conical or quadrangular pyramidal bottoms, and the angle between the conical slope of the conical bottom and the horizontal plane is greater than 35° and less than 65°.

5. A pilot production line based on flotation clean coal according to claim 4, characterized in that: The conical bottom is provided with a discharge outlet, and the diameter of the discharge outlet is not less than 10% of the diameter of the non-conical section.

6. A method for detecting ash content of flotation clean coal produced by the pilot production line based on flotation clean coal according to claim 1, characterized in that: This is accomplished by: Take 50g of the prepared flotation clean coal slurry and quickly pour it into the Buchner funnel, and start timing at the same time. When the moisture on the surface of the filter cake completely disappears, record the time T, and calculate the ash percentage A of the flotation clean coal by the formula; The calculation formula for the ash percentage of the flotation clean coal slurry produced by the No. 1 mechanical agitation flotation machine is: T = 0.37*A + 10.32; The calculation formula for the ash percentage of the flotation clean coal slurry produced by the No. 2 mechanical agitation flotation machine is: T = 0.59*A + 3.96; The calculation formula for the ash percentage of the flotation clean coal slurry obtained by the No. 1 flotation column or the No. 2 flotation column is: T = 1.5*A-0.33; Among them, the Büchner funnel is a 95-hole round Büchner funnel with a funnel volume of 100 ml, an inner diameter of 55 mm, a filter hole inner diameter of 1.5 mm, and a filter paper that meets the GB / T 1914-2017 standard. The filtration pressure is 0.08 MPa.

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