Defoaming separation device and separation method for minerals

Abstract

The invention provides a defoaming separation device for minerals and a separation method, and belongs to the technical field of mineral separation, the device comprises a feeding pipeline, a defoaming box, a vacuum pump and a PLC control system, the defoaming box is connected with the feeding pipeline, a moving plate is arranged in the defoaming box, the bottom of the moving plate is connected with a jacking assembly, and the jacking assembly is connected with the vacuum pump. The center of the top of the defoaming box is connected with a driving assembly, the top of the defoaming box is further connected with an exhaust pipe, a transmission shaft of the driving assembly extends into the defoaming box, and the transmission shaft is sequentially connected with a first-stage stirring assembly, a second-stage stirring assembly and a third-stage stirring assembly from top to bottom. The blade angle of the first-stage stirring assembly is adjustable through forward installation or reverse installation of an adapter block, a solid-liquid separation assembly is arranged at the bottom of a movable plate, and a vacuum pump is connected to the top of the defoaming box through a negative pressure pipeline. According to the invention, defoaming and solid-liquid separation can be efficiently carried out on the froth pulp after flotation, the defoaming speed is high, the separation efficiency is high, the energy consumption is low, and good economic benefits and environmental protection benefits are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral separation, and in particular relates to a defoaming separation device and a separation method for minerals. Background Art

[0002] In many industrial processes, complex three-phase mixed systems containing solid particles, liquids and gases are often produced. Effective separation of the various phases in these mixed systems is crucial to improving product quality, reducing production costs, reducing resource waste and protecting the environment. For example, in the fields of mineral processing, wastewater treatment, petrochemicals, food processing, etc., efficient separation of solid-liquid-gas three-phase mixtures is required. However, these three-phase mixtures, especially some stable foam systems, often contain a large amount of water and solid particles, and their separation process is relatively cumbersome, which not only affects the subsequent solid-liquid separation, dehydration, transportation and other processes, but may also cause the loss of useful substances.

[0003] Patent document CN118594041A is retrieved and disclosed as a flotation concentrate defoaming device, comprising a flotation base, the top of which is fixedly connected with a flotation assembly; the flotation base comprises a separation box, the interior of which is fixedly sleeved with an annular overflow pipe, the bottom of which is located below the separation box and one end thereof is fixedly connected with a flotation concentrate water inlet pipe, and a clamping hole is provided on the top of the separation box. The above scheme has the common advantages of all physical defoaming technologies, and has the characteristics of high mechanization degree and convenient arrangement and installation of mechanical defoaming, as well as the advantages of good defoaming effect and fast speed of spray defoaming, and can fully and timely enhance the defoaming effect of flotation concentrate, and is suitable for flotation concentrates with thick foam layers and difficult to eliminate, and covers multiple physical defoaming technologies, and has spraying and sieve plate filtration added compared with mechanical stirring, and mechanical stirring and sieve plate filtration added compared with water spray defoaming, and has simple structure, convenient installation and arrangement, low energy consumption, and small maintenance.

[0004] Although the above patent document can avoid foam overflow and improve flotation recovery rate, the effective area of ​​the device during defoaming is limited, and the defoaming effect is limited. In the prior art, pulp foam is a complex solid-liquid-gas three-phase system. The type, concentration, particle size, type of foaming agent and other factors of different pulps will affect the stability of pulp foam. For pulp containing a large number of fine bubbles, conventional mechanical stirring or spraying is difficult to effectively defoam; and for pulp containing coarse particles, ultrasonic defoaming may cause particle breakage, and existing defoaming devices usually lack targeted designs for bubbles of different sizes. Large bubbles require strong shear force, and tiny bubbles need to promote merging or accelerate rupture. It is difficult to take both into account, resulting in incomplete defoaming. At the same time, the existing defoaming device lacks an effective circulation mechanism, resulting in uneven contact between the pulp and the defoaming device, and there are differences in the defoaming effect. Some pulps may be insufficiently or excessively defoamed, resulting in the loss of useful minerals. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a defoaming and separation device and a separation method for minerals, which effectively solve the problem in the prior art that the pulp foam is a complex solid-liquid-gas three-phase system, and factors such as the type, concentration, particle size, and foaming agent type of different pulps will affect the stability of the pulp foam. For pulp containing a large number of fine bubbles, conventional mechanical stirring or spraying is difficult to effectively defoam; and for pulp containing coarse particles, ultrasonic defoaming may cause particle breakage, and existing defoaming devices usually lack targeted designs for bubbles of different sizes. Large bubbles require strong shear forces, and tiny bubbles need to promote merging or accelerate rupture, which is difficult to take into account and leads to incomplete defoaming. At the same time, the existing defoaming devices lack an effective circulation mechanism, resulting in uneven contact between the pulp and the defoaming device, differences in defoaming effects, and some pulps may be insufficiently or excessively defoamed, resulting in the loss of useful minerals.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a defoaming and separation device for minerals, comprising a feed pipeline, a defoaming box, a vacuum pump and a PLC control system, the defoaming box is connected to the feed pipeline, a movable plate is arranged inside the defoaming box, a lifting assembly is connected to the bottom of the movable plate, a driving assembly is connected to the top center of the defoaming box, an exhaust pipe is also connected to the top of the defoaming box, a transmission shaft of the driving assembly extends into the interior of the defoaming box, the transmission shaft is sequentially connected to a primary stirring assembly, a secondary stirring assembly and a tertiary stirring assembly from top to bottom, the blade angle of the primary stirring assembly is adjustable by the forward or reverse installation of the adapter block, a solid-liquid separation assembly is arranged at the bottom of the movable plate, and the vacuum pump is connected to the top of the defoaming box through a negative pressure pipe.

[0007] As a further improvement of the present invention, a booster pump and a stop valve are provided on the feed pipeline, and the lifting assembly includes two electric push rods, and the tops of the extending shafts of the electric push rods are connected to electric push rod connecting blocks, and the electric push rod connecting blocks are located at the bottom of the movable plate and connected thereto.

[0008] As a further improvement of the present invention, the defoaming box also includes a defoaming box cylinder and a top cover, the top cover is located on the top of the defoaming box cylinder and is fixedly connected thereto, a feed port is provided on one side of the defoaming box cylinder, an exhaust port, a safety valve and a negative pressure connecting port are provided on the top cover, the exhaust port is connected to the exhaust pipe, and a wire mesh defoamer and a one-way valve are provided on the exhaust pipe.

[0009] As a further improvement of the present invention, a first through hole is provided at the center of the movable plate, a first sealing groove is provided inside the first through hole, a second sealing groove is provided at the periphery of the movable plate, a discharge pipe is also provided on the movable plate, a first solenoid valve is provided on the discharge pipe, an outlet of the first solenoid valve is connected to a hose, and the hose is communicated with the solid-liquid separation component.

[0010] As a further improvement of the present invention, the drive assembly also includes a reducer and a coupling, the reducer is located on the top of the top cover and fixedly connected thereto, one end of the coupling is connected to the protruding shaft of the reducer, and the other end is connected to the transmission shaft.

[0011] As a further improvement of the present invention, the first-level stirring assembly also includes a first base and a first stirring blade, one end of the adapter block is connected to the first base, and the other end of the adapter block is connected to the first stirring blade, a second through hole is provided in the center of the first base, a plurality of inclined grooves are provided on the periphery of the first base, a first threaded hole is provided in the inclined groove, a second threaded hole is provided below the first threaded hole, a third threaded hole is provided on the adapter block, the third threaded hole is a blind hole, a third through hole is also provided on the adapter block, a countersunk side is provided on the inclined side of the third through hole close to the adapter block, and a plurality of cutting blades are provided on the blade of the first stirring blade.

[0012] As a further improvement of the present invention, the secondary stirring assembly includes a second base and a second stirring blade connected thereto, a fourth through hole is opened at the center of the second base, a fourth threaded hole is opened at the outer periphery of the second base, and a fifth through hole is opened on the second stirring blade; the tertiary stirring assembly includes a third base and a third stirring blade connected thereto.

[0013] As a further improvement of the present invention, the solid-liquid separation component includes a separation box, a partition plate, a slag cleaning port and a box top cover, the partition plate is located inside the separation box, and the partition plate divides the separation box into two areas A and B, wherein the slag cleaning port is provided on the outer side of area A, and a liquid discharge port is provided at the bottom center of area B.

[0014] As a further improvement of the present invention, the defoaming box cylinder is provided with an inspection door at the installation position of the first-stage stirring assembly, and a second solenoid valve is also provided on the negative pressure pipeline.

[0015] The present invention also provides a separation method of a defoaming separation device for minerals, the separation method comprising the following steps: S1, start the booster pump, and the foam slurry after flotation flows into the defoaming tank through the feed pipe. At this time, the electric push rod is in a fully extended state; S2, start the reducer to drive the transmission shaft to rotate. At this time, the first-stage stirring assembly, the second-stage stirring assembly and the third-stage stirring assembly all rotate together with the transmission shaft. After a preset time, turn off the booster pump; S3, through the PLC control system, the electric push rod is made to move up and down periodically, the foam slurry in the defoaming box cylinder is circulated and defoamed, the solid-liquid-gas three-phase stable state of the foam slurry is destroyed, and the gas is discharged through the exhaust pipe; S4, after a preset time, the electric push rod returns to the initial extension state and the speed reducer stops running; S5, start the vacuum pump to generate negative pressure in the defoaming tank cylinder, so as to cause the residual bubbles of the foam slurry in the defoaming tank cylinder to burst; S6, after the residual bubbles are shattered, the vacuum pump is stopped, and the second solenoid valve is opened to allow external gas to enter the defoaming tank cylinder, so that the defoaming tank cylinder returns to normal pressure; S7, open the first solenoid valve, and after the solid-liquid mixture in the defoaming tank cylinder enters the A area of ​​the separation tank, close the first solenoid valve and the second solenoid valve; S8, the liquid in the A area of ​​the separation box enters the B area of ​​the separation box through the partition plate and enters the designated pipeline through the discharge port, and the solid remains at the bottom of the A area of ​​the separation box, completing the solid-liquid separation.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) The defoaming and separation device for minerals provided by the present invention can efficiently defoam and separate the solid-liquid from the foam pulp after flotation. It has a fast defoaming speed, high separation efficiency and low energy consumption. It can effectively improve the recovery rate and concentrate grade of mineral flotation, reduce production costs, and has good economic and environmental benefits.

[0017] (2) The present invention can utilize the cutting blade on the first-stage stirring blade to quickly cut large bubbles and increase the specific surface area of ​​the bubbles through the coordinated cooperation of the first-stage stirring component, the second-stage stirring component, the third-stage stirring component and the driving component, and can utilize the micropores on the second-stage stirring blade to promote the merging of small bubbles to form larger bubbles, and can also utilize the hydrophobic layer on the surface of the third-stage stirring blade to accelerate the rupture of tiny bubbles, thereby realizing step-by-step and efficient defoaming of the foam slurry. Specifically, when the driving component drives the transmission shaft to rotate, the third-stage stirring component rotates synchronously, the first-stage stirring component is responsible for cutting large bubbles, the second-stage stirring component is responsible for merging small bubbles, and the third-stage stirring component is responsible for accelerating the rupture of bubbles, thereby finally realizing efficient defoaming of the foam slurry under stirring.

[0018] (3) The present invention can make the foam slurry in the defoaming box form a circulation flow through the cooperation of the lifting component, the moving plate and the defoaming box cylinder, so that the slurry can fully contact with the stirring components at each level, thereby improving the defoaming efficiency, and prevent solid particles from being deposited at the bottom of the defoaming box, avoiding blockage and ensuring the continuous and stable progress of the defoaming process; specifically, when the lifting component drives the moving plate to reciprocate up and down, it drives the stirring components at each level to move up and down in the defoaming box cylinder, so that the foam slurry forms a circulation flow in the defoaming box, thereby achieving full contact between the slurry and the stirring components, improving the defoaming efficiency and preventing the deposition of solid particles.

[0019] (4) The present invention can generate negative pressure in the defoaming box through the cooperation of the vacuum pump, the negative pressure pipe, the second solenoid valve and the defoaming box, thereby causing the residual bubbles in the slurry to burst and achieving complete defoaming, and can also smoothly restore normal pressure through slow air intake to avoid secondary foaming, thereby ensuring the effect of subsequent solid-liquid separation; specifically, when the vacuum pump is started, negative pressure is generated in the defoaming box to accelerate the bursting of bubbles. After the defoaming is completed, air is slowly introduced through the second solenoid valve to restore normal pressure, thereby avoiding the generation of new bubbles due to rapid air intake and ensuring the thoroughness of defoaming.

[0020] (5) The present invention can change the blade angle of the first-stage stirring assembly by installing the adapter block forward or backward to adapt it to different types of slurries and improve the defoaming effect, and can also easily replace worn blades to reduce maintenance costs. Specifically, when processing different types of slurries, the angle between the first-stage stirring blade and the horizontal plane can be changed by adjusting the installation direction of the adapter block to achieve the optimal defoaming angle, thereby improving the adaptability to different slurries and the defoaming efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the connection between the movable plate and the lifting assembly of the present invention; Figure 3 It is a schematic diagram of the connection between each stirring assembly and the transmission shaft when the adapter block of the present invention is reversely installed; Figure 4 The present invention Figure 3 Schematic diagram when the moving plate moves to another extreme position; Figure 5 It is a structural schematic diagram of the primary stirring assembly when the adapter block of the present invention is reversely installed; Figure 6 It is a structural schematic diagram of the primary stirring assembly when the adapter block of the present invention is installed properly; Figure 7 is a schematic structural diagram of a first base of the present invention; Figure 8 It is a structural schematic diagram of the adapter block of the present invention; Fig. 9 It is a schematic diagram of the structure of the secondary stirring assembly of the present invention; Fig.10 is a schematic structural diagram of a second base of the present invention; Fig.11 It is a schematic structural diagram of the solid-liquid separation component of the present invention.

[0022] In the figure: 100, feed pipe; 101, booster pump; 102, stop valve; 200, defoaming box; 210, defoaming box cylinder; 211, feed port; 220, top cover; 221, exhaust port; 222, safety valve; 223, negative pressure connection port; 230, exhaust pipe; 231, one-way valve; 240, moving plate; 241, first through hole; 242, first sealing groove; 243, second sealing groove; 250, discharge pipe; 251, first solenoid valve; 252, hose; 300, lifting assembly; 310, electric push rod; 320, electric push rod connecting block; 400, drive assembly; 410, reducer; 420, coupling; 430, transmission shaft; 500, primary stirring assembly; 510, first base; 51 1. Second through hole; 512. Inclined groove; 513. First threaded hole; 514. Second threaded hole; 520. Adapter block; 521. Third threaded hole; 522. Third through hole; 523. Countersunk side; 530. First stirring blade; 531. Cutting disc; 600. Second stirring assembly; 610. Second base; 611. Fourth through hole; 612. Fourth threaded hole; 620. Second stirring blade; 621. Fifth through hole; 700. Third stirring assembly; 710. Third base; 720. Third stirring blade; 800. Solid-liquid separation assembly; 810. Separation box; 811. Drain port; 820. Partition plate; 830. Slag removal port; 900. Negative pressure pipe; 901. Vacuum pump; 902. Second solenoid valve. DETAILED DESCRIPTION

[0023] 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.

[0024] It should be pointed out that the terms "upper", "lower", "left", "right", "top", "bottom", "inside", "outside" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0025] It should be understood that, in the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense.

[0026] Example 1: See attached Figures 1 to 11 The present embodiment 1 provides a defoaming and separation device for minerals, comprising a feed pipe 100, a defoaming box 200, a vacuum pump 901 and a PLC control system. The defoaming box 200 is connected to the feed pipe 100. A moving plate 240 is arranged inside the defoaming box 200. A lifting assembly 300 is connected to the bottom of the moving plate 240. A driving assembly 400 is connected to the center of the top of the defoaming box 200. An exhaust pipe 230 is also connected to the top of the defoaming box 200. A transmission shaft 430 of the driving assembly 400 extends into the interior of the defoaming box 200. The transmission shaft 430 is sequentially connected with a primary stirring assembly 500, a secondary stirring assembly 600 and a tertiary stirring assembly 700 from top to bottom. The primary stirring assembly 500 can adjust the blade angle by forward or reverse installation of the adapter block 520 connected thereto. A solid-liquid separation assembly 800 is arranged at the bottom of the movable plate 240. The vacuum pump 901 is connected to the top of the defoaming box 200 through a negative pressure pipe 900. The lifting assembly 300 drives the movable plate 240 to reciprocate up and down to realize the circulation defoaming of the foam slurry in the defoaming box 200.

[0027] A boost pump 101 and a stop valve 102 are provided on the feed pipeline 100. The jacking assembly 300 includes two electric push rods 310. The top of the extended shaft of the electric push rod 310 is connected to an electric push rod connecting block 320. The electric push rod connecting block 320 is located at the bottom of the movable plate 240 and fixedly connected thereto. The jacking assembly is connected to the foundation through a support (not shown in the figure).

[0028] The defoaming box 200 also includes a defoaming box cylinder 210 and a top cover 220. The top cover 220 is located at the top of the defoaming box cylinder 210 and is fixedly connected thereto. A feed port 211 is provided on one side of the defoaming box cylinder, and the post-flotation foam pulp is pumped into the defoaming box 200 from the feed pipe 100 through the feed port 211. An exhaust port 221, a safety valve 222 and a negative pressure connection port 223 are provided on the top cover 220. The exhaust port 221 is connected to the exhaust pipe 230. The exhaust pipe 230 is provided with a wire mesh defoamer and a one-way valve 231. When the lifting assembly 300 is lifted or lowered, the movable plate 240 slides inside the defoaming box cylinder 210 along the axial direction of the defoaming box cylinder 210. The defoaming box cylinder 210 is connected to the foundation through a support (not shown in the figure). An observation window (not shown in the figure) is usually provided on the defoaming box cylinder 210.

[0029] A first through hole 241 is provided at the center of the movable plate 240, a first sealing groove 242 is provided inside the first through hole 241, a second sealing groove 243 is provided in the middle of the outer periphery of the movable plate 240, and a discharge pipe 250 is also provided on the movable plate 240, a first solenoid valve 251 is provided on the discharge pipe 250, an outlet of the first solenoid valve 251 is connected to a hose 252, and the hose 252 is connected to the solid-liquid separation component 800.

[0030] The driving assembly 400 also includes a reducer 410 and a coupling 420. The reducer 410 is located on the top of the top cover 220 and is fixedly connected thereto. One end of the coupling 420 is connected to the extended shaft of the reducer 410, and the other end is connected to the transmission shaft 430. The transmission shaft 430 passes through the movable plate 240.

[0031] The primary stirring assembly 500 also includes a first base 510 and a first stirring paddle 530, one end of the adapter block 520 is connected to the first base 510, and the other end of the adapter block 520 is connected to the first stirring paddle 530, a second through hole 511 is provided in the center of the first base 510, a plurality of inclined grooves 512 are provided on the periphery of the first base 510, a first threaded hole 513 is provided in the inclined groove 512, a second threaded hole 514 is provided below the first threaded hole 513, a third threaded hole 521 is provided on the adapter block 520, the third threaded hole 521 is a blind hole, a third through hole 522 is also provided on the adapter block 520, a countersunk side 523 is provided on the inclined side of the third through hole 522 close to the adapter block 520, and a plurality of cutting blades 531 are provided on the blade of the first stirring paddle 530, such as Figure 5 As shown, when the first stirring blade 530 is fixedly installed by the adapter block 520, the angle θ1 between the first stirring blade 530 and the horizontal plane is in the range of 53-57 degrees, preferably 55 degrees. Figure 6 As shown, when the first stirring blade 530 is fixedly installed in the upright position through the adapter block 520, the angle θ1 between the first stirring blade 530 and the horizontal plane is in the range of 38-42 degrees, preferably 40 degrees. By installing the adapter block 520 upright or reversely, the blade angle of the primary stirring assembly 500 can be changed to adapt to different types of slurries and improve the defoaming effect.

[0032] The secondary stirring assembly 600 includes a second base 610 and a second stirring blade 620 connected thereto. A fourth through hole 611 is provided at the center of the second base 610, a fourth threaded hole 612 is provided on the periphery of the second base 610, and a fifth through hole 621 is provided on the second stirring blade 620. When the second stirring blade 620 is fixedly installed, the angle θ2 between the second stirring blade 620 and the horizontal plane is in the range of 28-32 degrees, preferably 30 degrees. The fifth through hole 621 is mainly used as a microhole.

[0033] The tertiary stirring assembly 700 includes a third base 710 and a third stirring blade 720 connected thereto. The third stirring blade 720 is coated with a hydrophobic layer. When the third stirring blade 720 is fixedly installed, the angle θ3 between the third stirring blade 720 and the horizontal plane is in the range of 13-17 degrees, preferably 15 degrees. The maximum outer diameters of the primary stirring assembly 500, the secondary stirring assembly 600 and the tertiary stirring assembly 700 decrease successively.

[0034] It is not difficult to understand that the maximum outer diameters of the first-stage stirring assembly 500, the second-stage stirring assembly 600 and the third-stage stirring assembly 700 of the present invention decrease successively, which can ensure that the large bubbles in the upper part are fully cut, and the small bubbles and tiny bubbles in the lower part are effectively processed, thereby realizing all-round and thorough defoaming of the foam slurry; specifically, the first-stage stirring assembly 500 with a larger diameter is used to process the larger bubbles in the upper part, and the second-stage stirring assembly 600 and the third-stage stirring assembly 700 with decreasing diameters successively are used to process the small bubbles and tiny bubbles in the middle and bottom parts, respectively. Through this step-by-step decreasing design, it is ensured that bubbles of various sizes in the slurry can be effectively processed, thereby improving the thoroughness of the defoaming.

[0035] The solid-liquid separation component 800 includes a separation box 810, a partition plate 820, a slag removal port 830 and a box top cover. The separation box 810 is connected to the foundation through a support (not shown in the figure). The partition plate 820 is provided with a filter screen. The partition plate 820 is located inside the separation box 810. The partition plate 820 divides the separation box 810 into two areas A and B, wherein a slag removal port 830 is provided on the outer side of area A, and a drain port 811 is provided at the bottom center of area B. The box top cover is located on the top of the separation box 810 and is detachably connected thereto. The hose 252 passes through the box top cover and extends into the interior of area A of the separation box 810.

[0036] The defoaming box cylinder 210 is provided with an inspection door (not shown in the figure) at the installation position of the first-stage stirring assembly 500. Through the inspection door, it is convenient to switch between reverse installation or normal installation of the adapter block 520 according to the type, concentration, particle size and type of foaming agent of the slurry. At the same time, a second solenoid valve 902 is also provided on the negative pressure pipeline 900.

[0037] The present invention also provides a separation method of a defoaming separation device for minerals, the separation method comprising the following steps: S1, start the booster pump 101, and the foamed slurry after flotation flows into the defoaming tank cylinder 210 through the feed pipe 100, and the electric push rod 310 is in a fully extended state; S2, start the reducer 410 to drive the transmission shaft 430 to rotate. At this time, the first-stage stirring assembly 500, the second-stage stirring assembly 600 and the third-stage stirring assembly 700 all rotate together with the transmission shaft 430. After a preset time, turn off the booster pump 101; S3, the electric push rod 310 is made to move up and down periodically through the PLC control system, the foam slurry in the defoaming box cylinder 210 is cyclically defoamed, the solid-liquid-gas three-phase stable state of the foam slurry is destroyed, and the gas is discharged through the exhaust pipe 230; S4, after a preset time, the electric push rod 310 is restored to the initial extension state, and the speed reducer 410 is stopped; S5, start the vacuum pump 901 to generate negative pressure in the defoaming tank cylinder 210, so as to cause the residual bubbles of the foam slurry in the defoaming tank cylinder 210 to burst; S6, after the residual bubbles are destroyed, the operation of the vacuum pump 901 is stopped, and the second solenoid valve 902 is opened to allow the external gas to slowly enter the defoaming tank cylinder 210, so that the defoaming tank cylinder 210 returns to normal pressure; S7, open the first solenoid valve 251, and after the solid-liquid mixture in the defoaming tank cylinder 210 enters the A area of ​​the separation tank 810, close the first solenoid valve 251 and the second solenoid valve 902; S8, the liquid in the A area of ​​the separation box 810 enters the B area of ​​the separation box 810 through the partition plate 820 and enters the designated pipeline through the discharge port 811, and the solid remains at the bottom of the A area of ​​the separation box 810, completing the solid-liquid separation.

[0038] It is not difficult to understand that in the above-mentioned step S6, in order to smoothly restore normal pressure and avoid secondary foaming, the external gas is usually allowed to slowly enter the defoaming tank cylinder 210. For some easily oxidizable slurry foams, nitrogen is usually allowed to enter the defoaming tank cylinder 210 through the second solenoid valve 902. In actual implementation, in order to protect the vacuum pump 901, a gas-liquid separator can be set at the front end of the vacuum pump 901.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A defoaming and separation device for minerals, comprising a feed pipe (100), characterized in that: The invention also comprises a defoaming box (200), a vacuum pump (901) and a PLC control system. The defoaming box (200) is connected to the feeding pipeline (100). A moving plate (240) is arranged inside the defoaming box (200). A lifting assembly (300) is connected to the bottom of the moving plate (240). A driving assembly (400) is connected to the center of the top of the defoaming box (200). An exhaust pipe (230) is also connected to the top of the defoaming box (200). A transmission shaft (430) of the driving assembly (400) is connected to the exhaust pipe (230). ) extends into the interior of the defoaming box (200), the transmission shaft (430) is connected to a first-stage stirring assembly (500), a second-stage stirring assembly (600) and a third-stage stirring assembly (700) in sequence from top to bottom, the first-stage stirring assembly (500) can adjust the blade angle by forward or reverse installation of the adapter block (520), a solid-liquid separation assembly (800) is arranged at the bottom of the movable plate (240), and the vacuum pump (901) is connected to the top of the defoaming box (200) through a negative pressure pipe (900).

2. The defoaming and separation device for minerals according to claim 1, characterized in that: The feed pipeline (100) is provided with a booster pump (101) and a stop valve (102), and the lifting assembly (300) includes two electric push rods (310), and the top of the extended shaft of the electric push rod (310) is connected to an electric push rod connecting block (320), and the electric push rod connecting block (320) is located at the bottom of the moving plate (240) and connected thereto.

3. The defoaming and separation device for minerals according to claim 2, characterized in that: The defoaming box (200) further comprises a defoaming box cylinder (210) and a top cover (220); the top cover (220) is located at the top of the defoaming box cylinder (210) and is fixedly connected thereto; a feed port (211) is provided on one side of the defoaming box cylinder; an exhaust port (221), a safety valve (222) and a negative pressure connection port (223) are provided on the top cover (220); the exhaust port (221) is connected to the exhaust pipe (230); and the exhaust pipe (230) is provided with a wire mesh defoamer and a one-way valve (231).

4. The defoaming and separation device for minerals according to claim 2, characterized in that: A first through hole (241) is provided at the center of the movable plate (240), a first sealing groove (242) is provided inside the first through hole (241), a second sealing groove (243) is provided on the periphery of the movable plate (240), a discharge pipe (250) is also provided on the movable plate (240), a first solenoid valve (251) is provided on the discharge pipe (250), an outlet of the first solenoid valve (251) is connected to a hose (252), and the hose (252) is connected to the solid-liquid separation component (800).

5. The defoaming and separation device for minerals according to claim 3, characterized in that: The driving assembly (400) further comprises a reducer (410) and a coupling (420); the reducer (410) is located on the top of the top cover (220) and is fixedly connected thereto; one end of the coupling (420) is connected to the protruding shaft of the reducer (410), and the other end is connected to the transmission shaft (430).

6. The defoaming and separation device for minerals according to claim 4, characterized in that: The primary stirring assembly (500) further comprises a first base (510) and a first stirring blade (530), one end of the adapter block (520) is connected to the first base (510), and the other end of the adapter block (520) is connected to the first stirring blade (530), a second through hole (511) is provided at the center of the first base (510), a plurality of inclined grooves (512) are provided on the outer periphery of the first base (510), and a first threaded hole is provided in the inclined groove (512) (513), a second threaded hole (514) is provided below the first threaded hole (513), a third threaded hole (521) is provided on the adapter block (520), the third threaded hole (521) is a blind hole, a third through hole (522) is also provided on the adapter block (520), a countersunk side (523) is provided on the inclined side of the third through hole (522) close to the adapter block (520), and a plurality of cutting blades (531) are provided on the blade of the first stirring paddle (530).

7. The defoaming and separation device for minerals according to claim 6, characterized in that: The secondary stirring assembly (600) comprises a second base (610) and a second stirring blade (620) connected thereto, a fourth through hole (611) is provided at the center of the second base (610), a fourth threaded hole (612) is provided at the periphery of the second base (610), and a fifth through hole (621) is provided on the second stirring blade (620); the tertiary stirring assembly (700) comprises a third base (710) and a third stirring blade (720) connected thereto.

8. The defoaming and separation device for minerals according to claim 7, characterized in that: The solid-liquid separation component (800) includes a separation box (810), a partition plate (820), a slag removal port (830) and a box top cover, wherein the partition plate (820) is located inside the separation box (810). The partition plate (820) divides the separation box (810) into two areas, A and B, wherein the slag removal port (830) is provided on the outer side of the A area, and a liquid discharge port (811) is provided at the bottom center of the B area.

9. The defoaming and separation device for minerals according to claim 3, characterized in that: The defoaming tank cylinder (210) is provided with an inspection door at the installation position of the primary stirring assembly (500), and a second solenoid valve (902) is also provided on the negative pressure pipeline (900).

10. The separation method of the defoaming separation device for minerals according to any one of claims 1 to 9, characterized in that: The separation method comprises the following steps: S1, start the booster pump (101), and the foamed slurry after flotation flows into the defoaming tank cylinder (210) through the feed pipe (100), and the electric push rod (310) is in a fully extended state; S2, start the reducer (410) to drive the transmission shaft (430) to rotate, at which time the first-stage stirring assembly (500), the second-stage stirring assembly (600) and the third-stage stirring assembly (700) all rotate together with the transmission shaft (430), and after a preset time, turn off the booster pump (101); S3, the electric push rod (310) is caused to move up and down periodically through the PLC control system, the foam slurry in the defoaming box cylinder (210) is cyclically defoamed, the solid-liquid-gas three-phase stable state of the foam slurry is destroyed, and the gas is discharged through the exhaust pipe (230); S4, after a preset time, the electric push rod (310) is restored to the initial extended state, and the speed reducer (410) is stopped; S5, starting the vacuum pump (901) to generate negative pressure in the defoaming tank cylinder (210), thereby causing the residual bubbles of the foamed slurry in the defoaming tank cylinder (210) to burst; S6, after the residual bubbles are shattered, the operation of the vacuum pump (901) is stopped, and the second solenoid valve (902) is opened to allow external gas to enter the defoaming tank cylinder (210), so that the defoaming tank cylinder (210) returns to normal pressure; S7, opening the first solenoid valve (251), after the solid-liquid mixture in the defoaming tank cylinder (210) enters the A region of the separation tank (810), the first solenoid valve (251) and the second solenoid valve (902) are closed; S8, the liquid in the A region of the separation box (810) enters the B region of the separation box (810) through the partition plate (820) and enters the designated pipeline through the discharge port (811), and the solid remains at the bottom of the A region of the separation box (810), completing the solid-liquid separation.

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