High-pressure roller grinding screening pre-slurry-making system and control method

Abstract

The invention discloses a high-pressure roller grinding, screening and pre-pulping system and a control method, and relates to the technical field of mineral separation roller grinding and pulping. Comprising a high-pressure roller mill, pre-pulping equipment, a wet screening machine and a ball mill pump pool, the pre-slurry-making equipment comprises a feeding box body, a feeding hole and a flushing water pipe are arranged at the top of the feeding box body, and a feeding cavity and a triangular rib plate are arranged in the feeding box body; opposite flushing water pipes are arranged on the two sides of the slurry making box body, and the opposite flushing angle is 120 + / -5 degrees; a plurality of groups of slurry making sub-water pipes are arranged at one end of the slurry making box body; the water supply controller comprises a slurry making main water pipe, and PID (Proportion Integration Differentiation) variable-frequency booster pumps, electromagnetic flowmeters and pressure sensors are mounted on the slurry making main water pipe and the opposite flushing water pipe; and the integrated control system comprises a PLC (Programmable Logic Controller) control box, and is used for regulating and controlling the rolling pressure of the high-pressure roller mill to be 100-110 bar, the slurry making water flow to be 10-30m < 3 > / h, the flushing pressure to be 0.3-0.6 MPa and the amplitude of the wet type screening machine to be 3-8mm in a linkage manner, so that the technical problem that the feeding uniformity cannot be well solved in the existing wet type roller mill screening system is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of beneficiation roller grinding and pulp making, and specifically provides a high-pressure roller grinding screening pre-pulping system and a control method therefor. Background Art

[0002] The high-pressure roller mill is a new type of efficient beneficiation equipment developed based on the laminating crushing mechanism. It makes full use of the working mechanism of laminating crushing, and the crushing method is quasi-static pressure crushing, with high energy utilization rate. Currently, the designed processing capacity of the high-pressure roller system in Dongbo Concentrator is as follows: the proportion of the roller mill discharge less than 3 mm is > 55%, and the screened finished product is > 500 t / h per hour. The process adopts a closed circuit of high-pressure roller grinding - wet inspection screening.

[0003] Among them, wet screening results in too high humidity of the feed of the high-pressure roller mill. After lamination, the material forms a cake shape. When it enters the screening again, the material has poor fluidity, uneven distribution, and accumulates during screening. On the one hand, it affects the service life of the sieve plate. On the other hand, the material cannot be washed away and the qualified products cannot pass through the sieve, resulting in an excessive amount of return sand with a proportion of more than 50% and low efficiency.

[0004] The wet screening machine currently used in Dongbo Concentrator is a segmented water spraying type. Under the premise of ensuring wet screening, the concentration of the pump sump cannot be stably adjusted, thus unable to improve the roller grinding efficiency of the high-pressure roller mill. The existing patent CN216573541U points out the optimization of the high-pressure roller wet screening system, but does not solve the problem of feed uniformity. Therefore, we provide a tower mill beneficiation system and a control method to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to make up for the deficiencies of the existing technology and provide a tower mill beneficiation system and a control method to solve the technical problem of the lack of good feed uniformity in the existing wet roller grinding screening system.

[0006] To solve the above technical problems, the present invention provides the following technical solutions:

[0007] A high-pressure roller grinding screening pre-pulping system includes a high-pressure roller mill, a wet screening machine, and a ball mill pump sump;

[0008] A pre-pulping device is also installed between the high-pressure roller mill and the wet screening machine;

[0009] The pre-pulping device includes:

[0010] A feed box body, the top of the feed box body is provided with a feed inlet, and a feed cavity is arranged inside the feed box body; triangular stiffeners are installed in the feed cavity, and a flushing water pipe is arranged on the feed box body;

[0011] Slurry-making box body, with a 45° inclined step at the bottom of the slurry-making box body and a ceramic wear-resistant plate laid on it; and there are counter-flushing water pipes on both sides, with a counter-flushing angle of 120° ± 5°; there are multiple groups of slurry-making sub-water pipes at one end of the slurry-making box body;

[0012] Water supply controller, including a main slurry-making water pipe, and PID variable-frequency booster pumps, electromagnetic flowmeters and pressure sensors are installed on both the main slurry-making water pipe and the counter-flushing water pipe;

[0013] Integrated control system, including a PLC control box, which jointly controls and regulates the roll pressure of the high-pressure roller mill at 100 - 110 bar, the slurry-making water flow at 10 - 30 m 3 / h, the counter-flushing water pressure at 0.3 - 0.6 MPa, and the amplitude of the wet screening machine at 3 - 8 mm.

[0014] In a further technical solution, the feeding box body has a rectangular box body structure, with dimensions of length 1500 mm × width 600 mm × height 1300 mm, and a 30-mm-thick ceramic wear-resistant plate is laid on the side wall; there is a flared drainage plate with a slope of 60° inside, and triangular gusset plates are welded in the middle to form a diversion cavity; the flushing water pipe is a DN25 water pipe, and the flushing water flow rate ranges from 0.5 - 1.2 m 3 / h.

[0015] In a further technical solution, the slurry-making box body has dimensions of length 3000 mm × width 1500 mm × height 650 mm, with a 45° inclined step and a 30-mm-thick ceramic wear-resistant plate at the bottom; there are 8 groups of DN100 slurry-making sub-water pipes at the back.

[0016] In a further technical solution, the height of the triangular gusset plate is 2 / 3 of the box body height, the top has a 30° sharp corner structure, the cross-section of the diversion cavity is trapezoidal, and the ratio of the long side to the short side is 1.5:1.

[0017] In a further technical solution, the integrated control system includes:

[0018] Concentration feedback module, which adjusts the frequency of the PID variable-frequency booster pump in real time through an on-line concentration meter installed at the outlet of the slurry-making box body;

[0019] Particle size compensation module, which dynamically adjusts the roll gap of the high-pressure roller mill according to the data of the laser particle size analyzer at the discharge port of the wet screening machine.

[0020] In a further technical solution, stirring rods are also installed in the slurry-making box body, stirring blades are arranged on the stirring rods, there are multiple groups of stirring rods, and the ends of all of them extend outside the slurry-making box body and are installed with transmission gears;

[0021] Crushing plates are also installed on the stirring rods;

[0022] A position plate is installed outside the pulp making box body, and a driving motor is installed on the position plate. The output end of the driving motor is installed with a main position gear;

[0023] The main position gear and the transmission gear are arranged in parallel, and a pressing component is installed. The pressing component is suitable for synchronously driving the main position gear and the transmission gear.

[0024] In a further technical solution, the pressing component includes a lower tooth-shaped plate and an upper pressing plate. The lower tooth-shaped plate is installed at the bottom of the upper pressing plate. Tooth shapes are provided at the bottom of the lower tooth-shaped plate. The lower tooth-shaped plate meshes with the main position gear and the transmission gear;

[0025] Guide screws are respectively installed on both sides of the upper pressing plate, and positioning nuts are installed above and below the guide screws of the upper pressing plate; a guide groove is provided on the side of the upper pressing plate facing the lower tooth-shaped plate; protrusions are installed at the top of the lower tooth-shaped plate, and the protrusions are restricted to slide in the guide groove.

[0026] In a further technical solution, the shredding plate includes a fixing part, and the fixing part is fixedly connected to the inner wall of the pulp making box body; a transition groove is provided on the shredding plate, a knocking plate is provided in the transition groove, a branch plate is installed outside the transition groove, and a return spring is installed between the knocking plate and the branch plate. One end of the return spring is fixedly connected to the knocking plate, and the other end is fixedly connected to the branch plate;

[0027] The height of the stirring blade at the highest position during rotation is higher than the bottom height of the knocking plate, and the stirring blade contacts the knocking plate movably during rotation.

[0028] A control method for high-pressure roll grinding screening pre-pulping includes the following steps:

[0029] S1. The material discharged from high-pressure roll grinding is conveyed to the feeding box body by a belt, enters through the feeding port, and flushing water is added through the flushing water pipe, with a flow rate Q1 = 0.8 ± 0.2m 3 / h;

[0030] Cutting is carried out through the triangular rib plate to preliminarily disperse the cake-shaped material;

[0031] S2. Flushing water is introduced into the pulp making box body, and the pressure P1 = 0.45 ± 0.05MPa is controlled, and the pulp making water pressure P2 = 0.25 ± 0.03MPa. The flushing water and the pulp making water form a swirling flow field, and the pulp concentration is controlled at 55 - 65%;

[0032] The pulp making water enters the pulp making box body, and the equipment is started synchronously, so that the output end of the driving motor drives the main position gear to rotate. The main position gear drives the lower tooth-shaped plate to move, and drives the transmission gear to rotate, and then drives the stirring rod to rotate. The stirring blade on the stirring rod rotates and contacts the knocking plate movably, and the knocking plate knocks the pulp water actively, so as to further disperse the material, and then full dispersion is achieved through the stirring blade;

[0033] S3. The oversize material from the wet screening machine is returned to the high-pressure roll mill, and the undersize material enters the pump sump after passing the on-line inspection.

[0034] S4. When the detected sand return amount > 40%, automatically increase the counterflush water pressure ΔP = +0.1 MPa and reduce the roll gap of the high-pressure roll mill by 0.2 - 0.5 mm.

[0035] Compared with the prior art, the following beneficial effects are achieved:

[0036] The present invention can simultaneously solve the problems that the stability of the slurry entering the screening is improved through the pre-slurrying system, and the uniform feeding improves the service life of the sieve plate and the screening machine. The concentration ratio is adjusted in advance through the pre-slurrying system to improve the qualified products entering the pump sump. The present invention uses the pre-slurrying system to completely disperse the cake-shaped materials in advance to improve the screening efficiency, and the qualified products can be stably screened out, reducing the sand return amount of the high-pressure roll mill, thereby improving the roll grinding efficiency of the high-pressure roll mill.

[0037] In the present invention, the upper pressing plate presses on the lower toothed plate, and the connection is realized by setting the T-shaped guide groove and protrusion to achieve the longitudinal limit of the lower toothed plate, while the guide groove screw does not restrict the lateral movement of the lower toothed plate; by extending the stirring shaft outside the slurry-making tank and installing a coupling on the position plate for supporting effect; a transmission gear is installed at the end, and the main gear rotates with the rotation of the driving motor to drive the rotation, and meshes with the transmission gear, thereby realizing the rotation of the stirring shaft. The stirring blades periodically strike the bottom of the knocking plate to achieve the rotation effect of the knocking plate and the effect of knocking, dispersing and mixing the materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of the high-pressure roll grinding and screening pre-slurrying system of the present invention;

[0039] Figure 2 Front view of the installation of the pre-slurrying equipment of the present invention;

[0040] Figure 3 Structural diagram of the pre-slurrying equipment of the present invention;

[0041] Figure 4 Internal diagram of the feeding box of the present invention;

[0042] Figure 5 Structural diagram of the slurry-making tank of the present invention;

[0043] Figure 6 Cross-sectional view of the slurry-making tank in the present invention Figure 1 ;

[0044] Figure 7 Cross-sectional view of the slurry-making tank in the present invention Figure 2 ;

[0045] Figure 8 is Figure 7 the enlarged structural schematic diagram at position A in

[0046] Figure 9 the top view schematic diagram of the chipboard of the present invention;

[0047] Figure 10 is the back view schematic Figure 1 ;

[0048] Figure 11 is the back view schematic Figure 2 (removing the drive motor);

[0049] Figure 12 is the side view schematic diagram of the upper pressing plate, lower toothed plate and position plate of the present invention.

[0050] In the figure:

[0051] 1. High-pressure roller mill; 2. Wet screening machine; 3. Ball mill pump sump;

[0052] 4. Pre-pulping equipment;

[0053] 5. Feeding box; 51. Feeding port; 52. Flushing water pipe; 53. Bellmouth drainage plate; 54. Triangular rib plate;

[0054] 6. Pulping box; 61. Opposing water pipe; 62. Pulping sub-water pipe; 63. Inclined step;

[0055] 64. Stirring rod; 65. Transmission gear; 66. Chipboard; 67. Position plate; 68. Drive motor; 69. Main position gear; 610. Lower toothed plate; 611. Upper pressing plate; 612. Lead screw; 613. Guide groove;

[0056] 661. Fixed part; 662. Transition groove; 663. Knocking plate; 664. Branch plate; 665. Return spring;

[0057] 7. PLC control box; 71. Concentration feedback module; 72. Particle size compensation module;

[0058] 8. Pulping main water pipe; 9. PID variable frequency booster pump; 10. Electromagnetic flowmeter; 11. Pressure sensor; Specific embodiments

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] Example 1

[0061] See also Figures 1-6 , the present invention provides a technical solution, a high-pressure roller mill screening pre-pulping system, comprising a high-pressure roller mill 1, a wet screen 2 and a ball mill pump pool 3; a pre-pulping device 4 is also installed between the high-pressure roller mill 1 and the wet screen 2; the pre-pulping device will perform secondary flushing and dispersion of the cake-shaped material after wet grinding by the high-pressure roller mill, paving the way for entering the wet screen.

[0062] The pre-pulping equipment 4 includes: a feed box 5, a slurry box 6, a water supply controller and an integrated control system;

[0063] A feed port 51 is provided at the top of the feed box 5, and a feed cavity is provided in the feed box 5; a triangular rib plate is installed in the feed cavity, and the triangular rib plate is used to impact and break up part of the material, and a flushing water pipe 52 is provided on the feed box 5;

[0064] The pulping box 6 has a 45° inclined step 63 at the bottom and is paved with a ceramic wear-resistant plate; and counter-water pipes 61 are arranged on both sides, and the counter-water angle is 120°±5°. The counter-water angle refers to the angle between the counter-water pipes on both sides; and a plurality of groups of pulping sub-water pipes 62 are arranged at one end of the pulping box 6;

[0065] The water supply controller includes a pulping main water pipe 8, and a PID variable frequency booster pump 9, an electromagnetic flowmeter 10 and a pressure sensor 11 are installed on the pulping main water pipe 8 and the flushing water pipe 61; Figure 2 As shown, a PID variable frequency booster pump 9, an electromagnetic flowmeter 10 and a pressure sensor 11 located on the flushing water pipe and the pulping main water pipe are depicted.

[0066] The integrated control system includes a PLC control box 7, which controls the roller pressure of the high-pressure roller mill 1 at 100-110 bar and the pulping water flow rate at 10-30 m 3 / h, the flushing water pressure is 0.3-0.6MPa, and the amplitude of the wet screening machine 2 is between 3-8mm.

[0067] The feeding box body 5 is in the structure of a rectangular box, with dimensions of 1500 mm in length × 600 mm in width × 1300 mm in height, and ceramic wear-resistant plates with a thickness of 30 mm are laid on the side walls; a flared drainage plate 53 with a slope of 60° is arranged inside, and triangular stiffening plates 54 are welded in the middle to form a diversion cavity; the flushing water pipe 52 is a DN25 water pipe, and the range of the flushing water flow rate is 0.5 - 1.2 m 3 / h.

[0068] The size of the pulp-making box body 6 is 3000 mm in length × 1500 mm in width × 650 mm in height, a 45° inclined step 63 and ceramic wear-resistant plates with a thickness of 30 mm are arranged at the bottom; 8 groups of DN100 pulp-making sub-water pipes 62 are arranged at the back.

[0069] The top of the triangular stiffening plate 54 is in a 30° sharp corner structure, and the cross-section of the diversion cavity is trapezoidal, and the ratio of the long side to the short side is 1.5:1.

[0070] The integrated control system includes: a concentration feedback module 71, which adjusts the frequency of the PID variable frequency booster pump 9 in real time through an on-line concentration meter installed at the outlet of the pulp-making box body 6;

[0071] a particle size compensation module 72, which dynamically adjusts the roll gap of the high-pressure roll mill 1 according to the data of the laser particle size analyzer at the discharge port of the wet screening machine 2. The on-line concentration meter and the laser particle size analyzer are not drawn in the attached drawings. During actual use, substitute products can be used for detection to complete the collection and feedback of data, and data processing and corresponding real-time equipment control adjustment are carried out through the PLC control box.

[0072] Process:

[0073] 1. The discharge of the crushing system is transported to the high-pressure roll mill through a belt conveyor, and the roll grinding material is generated by extruding the material on the roll surface.

[0074] 2. The roll-ground material enters the pre-pulp-making system, is mixed with the counter-flushing water and the pulp-making water to form a pulp, and enters the screening machine.

[0075] 3. The pulp enters the screening, the coarse particles return to the high-pressure roll mill, and the qualified products enter the pump pool.

[0076] 4. The system dynamically adjusts various parameters according to the on-line detection data to ensure that the product concentration and particle size meet the standards.

[0077] Table 1. Key parameters of equipment

[0078]

[0079] Table 2. Comparison of usage

[0080]

[0081]

[0082] Table 1 shows the parameters of the adapted equipment, specifically including the processing parameters of the high-pressure roller mill and the processing parameters of the wet screening machine. The corresponding data are input into their respective controllers. Table 2 shows the comparison data between the pre-slurrying system and the separate wet screening process, indicating that the pre-slurrying equipment has achieved good improvement effects in the entire pre-slurrying system.

[0083] The present invention has the following advantages:

[0084] ① Integrated design: Integrate the high-pressure roller grinding and the pre-slurrying process to reduce equipment investment and energy consumption.

[0085] ② Integrated control mechanism: Coordinate and control by adjusting multiple parameters such as ore material, roll gap, water volume, and belt conveyor speed to solve the problems of fluctuating slurry concentration and particle size of the wet screening feed, and improve the screening and roller grinding efficiency.

[0086] ③ Environment optimization: Utilize the wet screening and slurrying system to reduce the dust generated during roller grinding and belt conveying.

[0087] The present invention can simultaneously solve the problem of improving the stability of the slurry entering the screening through the pre-slurrying system. The uniform feeding improves the service life of the sieve plate and the screening machine. Through the pre-slurrying system, the concentration ratio is adjusted in advance to improve the qualified products entering the pump tank. The present invention uses the pre-slurrying system to completely disperse the cake-like materials in advance to improve the screening efficiency. The qualified products can be stably screened out, reducing the back sand amount of the high-pressure roller mill, thereby improving the roller grinding efficiency of the high-pressure roller mill.

[0088] The present invention can reduce the energy consumption of the high-pressure roller mill by 10%; improve the concentration stability of the pump tank (fluctuation range < 10%); increase the pass rate of the slurry particle size to more than 75%; be applicable to various scenarios such as high-hardness ores and tailings reprocessing, with strong scalability.

[0089] Embodiment 2

[0090] As Figures 7-12 shown, this is another implementation of the present invention. On the basis of Embodiment 1, in order to achieve secondary crushing of the cake-like materials in the slurrying box, a stirring rod 64 is further installed in the slurrying box 6. Stirring blades are provided on the stirring rod 64. Multiple groups of stirring rods 64 are provided, and the ends thereof all extend outside the slurrying box 6 and are installed with transmission gears 65; a crushing plate 66 is also installed on the stirring rod 64;

[0091] A position plate 67 is installed outside the slurrying box 6, and a driving motor 68 is installed on the position plate 67. The output end of the driving motor 68 is installed with a main gear 69; the main gear 69 and the transmission gear 65 are arranged in parallel, and a pressing member is installed. The pressing member is adapted to synchronously drive the main gear 69 and the transmission gear 65.

[0092] AsFigures 10-12 As shown in the figure, the pressing member includes a lower toothed plate 610 and an upper pressing plate 611. The lower toothed plate 610 is installed at the bottom of the upper pressing plate 611. The bottom of the lower toothed plate 610 is provided with teeth, and the lower toothed plate 610 meshes with the main gear 69 and the transmission gear 65;

[0093] On both sides of the upper pressing plate 611, lead screws 612 are respectively installed, and positioning nuts are installed above and below the lead screws 612 of the upper pressing plate 611; on one side of the upper pressing plate 611 facing the lower toothed plate 610, a guide groove 613 is provided; a protrusion is installed at the top of the lower toothed plate 610, and the protrusion is restricted to slide within the guide groove 613. In the present invention, the upper pressing plate presses on the lower toothed plate, and is connected by setting a T-shaped guide groove and a protrusion to achieve the longitudinal limit of the lower toothed plate as Figure 10 described, while the lead screw of the guide groove does not restrict the lateral movement of the lower toothed plate; by extending the stirring shaft outside the pulp-making box body and installing a coupling on the position plate for support effect; a transmission gear is installed at the end, and the main gear is driven to rotate as the driving motor rotates, and meshes with the transmission gear, thereby realizing the rotation of the stirring shaft.

[0094] Such as Figure 9 As shown in the figure, the shredding plate 66 includes a fixing part 661, and the fixing part 661 is fixedly connected to the inner wall of the pulp-making box body 6; a transition groove 662 is provided on the shredding plate 66, a percussion plate 663 is provided in the transition groove 662, a branch plate 664 is installed outside the transition groove 662, a return spring 665 is installed between the percussion plate 663 and the branch plate 664, one end of the return spring 665 is fixedly connected to the percussion plate 663, and the other end is fixedly connected to the branch plate 664; the height of the stirring blade at the highest position during rotation is higher than the bottom height of the percussion plate 663, and the stirring blade is in movable contact with the percussion plate 663 during rotation. The stirring blade periodically and regularly impacts the bottom of the percussion plate to achieve the rotation effect of the percussion plate and the effect of percussion, dispersion and mixing of the material.

[0095] A control method for high-pressure roll grinding screening pre-pulping includes the following steps:

[0096] S1. The material discharged from the high-pressure roll mill is transported to the feeding box body 5 by a belt, enters through the feeding port 51, and washing water is added through the washing water pipe 52, with a flow rate Q1 = 0.8 ± 0.2 m 3 / h;

[0097] It is cut by the triangular rib plate 54 to preliminarily disperse the cake-like material;

[0098] S2. Wash water is flushed in the pulp-making box body 6, the pressure P1 = 0.45 ± 0.05 MPa is controlled, the pulp-making water pressure P2 = 0.25 ± 0.03 MPa, the wash water and the pulp-making water form a swirling flow field, and the pulp concentration is controlled at 55 - 65%;

[0099] The pulp-making water enters the pulp-making box body 6, and the equipment is started synchronously, so that the output end of the driving motor 68 drives the main gear 69 to rotate. The main gear 69 drives the lower toothed plate 610 to move, and drives the transmission gear 65 to rotate, and then drives the stirring rod 64 to rotate. The stirring blades on the stirring rod 64 rotate and actively abut against the knocking plate 663. The knocking plate 663 actively knocks the pulp water, so as to further disperse the materials. Then, full dispersion is achieved through the counterflush water and the stirring blades at the bottom;

[0100] S3. The oversize material of the wet screening machine 2 is returned to the high-pressure roller mill 1, and the undersize material enters the pump sump after passing the on-line inspection;

[0101] S4. When it is detected that the amount of back sand > 40%, the counterflush water pressure is automatically increased by ΔP = +0.1 MPa and the roll gap of the high-pressure roller mill 1 is reduced by 0.2 - 0.5 mm.

[0102] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

[0103] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A flotation process based on classified regrinding and high-efficiency flotation column cleaning, characterized in that, Including: Step a, raw material pretreatment: Crushing and grinding the complex associated polymetallic tailings until the particle size is less than 0.074 mm, with a proportion of 60% - 80%, to form an initial pulp. Step b, rough flotation of fluorite: Using oleic acid and water glass to conduct rough flotation on the initial pulp in the rough flotation tank (8) to obtain fluorite rough concentrate with a grade of 50% - 60% and tailings. Step c, classification treatment: Classifying the rough concentrate into a coarse particle size fraction greater than 0.038 mm and a fine particle size fraction less than 0.038 mm through a hydrocyclone or screening equipment. Step d, regrinding of the coarse particle size fraction: Regrinding the coarse particle size fraction of fluorite until the particle size is less than 0.038 mm to make it reach the best flotation particle size same as that of the fine particle size fraction. Step e, combined flotation and cleaning by a high - efficiency flotation column: Combining the re - ground coarse particle size fraction and the fine particle size fraction of fluorite for synchronous flotation. In the cleaning section, a high - efficiency flotation column is used. Utilizing its fine bubble characteristics to strengthen the capture of fine particle size fluorite, and at the same time improving the concentrate grade through multi - stage counter - current flushing. Step f, scavenging and return of middlings: Scavenging the tailings, returning the middlings to the rough flotation section for cyclic treatment, and finally obtaining high - grade fluorite concentrate.

2. The new flotation process based on staged regrinding and high-efficiency flotation column cleaning according to claim 1, characterized in that, The high-efficiency flotation column is a packed flotation column or a cyclone-static microbubble flotation column, and the operating parameters include: column height of 3 to 5 m, microbubble diameter of 0.1 to 0.5 mm, and flushing water flow rate of 1 to 2 m 3 / h.

3. A new flotation process based on staged regrinding and high-efficiency flotation column cleaning according to claim 1, characterized in that, The concentration of oleic acid in the rough flotation reagent is 400 - 800 g / t; the concentration of water glass is 1500 - 2500 g / t.

4. A new flotation process based on classified regrinding and high-efficiency flotation column cleaning as claimed in claim 1, characterized in that, In step a, the raw material pretreatment includes a first jaw crusher box (1) and a vibrating screening box (2). The first jaw crusher box (1) is provided with a feed inlet and a discharge outlet up and down. The bottom of the discharge outlet is equipped with an inclined conveyor belt (4) to the vibrating screening box (2). The vibrating screening box (2) is internally provided with a filter screen, and a qualified material outlet is provided at the bottom, and an unqualified material outlet is provided on the side; an unqualified material outlet is installed at the bottom of the second jaw crusher box (3), and a vertical separation conveyor belt (5) is installed at the bottom of the second jaw crusher box (3), and one end of the curve conveyor belt far away from the second jaw crusher box (3) is led to the feed inlet of the first jaw crusher box (1).

5. A flotation process based on classification regrinding and high-efficiency flotation column cleaning as claimed in claim 4, characterized in that, In step a, a wet ball mill (6) and a stirring kettle (7) are also included; Pour it into the wet ball mill (6) for adding water and stirring. The grinding size requirement is that the particle diameter is less than 0.074 mm, and then pump it into the stirring kettle (7) and add water to ensure that the particle proportion is 60% - 80% to form an initial pulp.

6. A flotation process based on staged regrinding and high-efficiency flotation column cleaning as claimed in claim 4, characterized in that, In step b, it includes a rough flotation tank (8), and the rough flotation tank (8) is connected to the outlet of the wet ball mill (6); The rough flotation tank (8) includes a main box body (81). A drive motor (82) is installed on the top of the main box body (81), and the output end of the drive motor (82) is upward; a vertical stirring shaft (83) is installed beside the drive motor (82). A top wheel (84) is installed at the top of the vertical stirring shaft (83). A drive wheel (85) is installed at the output end of the drive motor (82), and the drive wheel (85) and the top wheel (84) are connected by a transmission belt; Multiple flotation cavities are arranged in the rough flotation tank (8), and a flow - dividing plate (86) is installed at the interval, and a flow - through hole is arranged in the flow - dividing plate (86); The vertical stirring shaft (83) corresponds to the flotation cavities one by one; a stirring member (87) is installed at the bottom of the vertical stirring shaft (83).

7. A flotation process based on staged regrinding and high-efficiency flotation column cleaning according to claim 5, characterized in that, The stirring member (87) includes a central bottom body (871), and stirring blades (872) are hingedly installed on the central bottom body (871); A moving part (88) is further installed on the vertical stirring shaft (83). A hinge interface is provided on the moving part (88), and the hinge interface is connected to the stirring blade (872) through a hinge rod (810); A receiving cavity is arranged inside the central bottom body (871), and a spray port (873) is arranged outside the receiving cavity.

8. A flotation process based on staged regrinding and high-efficiency flotation column cleaning as claimed in claim 5, characterized in that, A threaded part is arranged on the vertical stirring shaft (83), and limiting rings (89) are fixedly installed above and below the threaded part; The moving part (88) includes a conical outer shell (881) and a threaded inner cylinder (882). An internal thread is provided inside the threaded inner cylinder (882), and the internal thread is in threaded connection with the threaded part; The conical outer shell (881) is provided with a hinge interface and is hinged to the stirring blade (872) through the installation of a hinge rod (810), and the stirring blade (872) is hinged to the hinge rod (810); A connecting bearing (811) is installed between the threaded inner cylinder (882) and the conical outer shell (881); An upper support plate (812) is arranged on the roughing flotation tank (8), and a position bearing (813) is installed between the vertical stirring shaft (83) and the upper support plate (812).

9. A flotation process based on staged regrinding and high-efficiency flotation column cleaning as claimed in claim 5, characterized in that, A horizontal stirring shaft (814) is installed on the roughing flotation tank (8), and the horizontal stirring shaft (814) extends outside the roughing flotation tank (8) and a rotating motor (815) is installed; A rotating rod (816) is installed on the horizontal stirring shaft (814). A fishing shovel (817) is installed on the rotating rod (816), and one end of the fishing shovel (817) is provided with a closed end. A clear water pipe (818) is connected outside the closed end, and the clear water pipe (818) extends to the horizontal stirring shaft (814); A water pipe cavity (819) is opened inside the horizontal stirring shaft (814), and a water inlet (820) is arranged at one end of the water pipe cavity (819) away from the rotating motor (815); Receiving boxes (821) are installed on both sides of the roughing flotation tank (8).

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