An antifoaming separation device and separation method for minerals

Abstract

A defoaming and separation device and separation method for minerals provided by the present invention belong to the technical field of mineral separation. The device includes a feed pipeline, a defoaming tank, a vacuum pump, and a PLC control system. The defoaming tank is connected to the feed pipeline. A moving plate is arranged inside the defoaming tank. A lifting assembly is connected to the bottom of the moving plate. A driving assembly is connected to the center of the top of the defoaming tank. An exhaust pipe is also connected to the top of the defoaming tank. The transmission shaft of the driving assembly extends into the inside of the defoaming tank. The transmission shaft is sequentially connected with a primary stirring assembly, a secondary stirring assembly, and a tertiary stirring assembly from top to bottom. The primary stirring assembly can adjust the blade angle by installing the adapter block correctly or reversely. A solid-liquid separation assembly is arranged at the bottom of the moving plate. The vacuum pump is connected to the top of the defoaming tank through a negative pressure pipeline. The present invention can efficiently defoam and separate solid and liquid from the frothed pulp after flotation, with a fast defoaming speed, high separation efficiency, and low energy consumption, having good economic and environmental benefits.

Description

Technical Field

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

[0002] In many industrial processes, a complex three-phase mixed system containing solid particles, liquid and gas often occurs. Effectively separating each phase in these mixed systems is crucial for improving product quality, reducing production costs, reducing resource waste and protecting the environment. For example, in the fields of mineral processing, wastewater treatment, petrochemical industry, 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 the separation process is rather cumbersome, which not only affects subsequent solid-liquid separation, dehydration, transportation and other processes, but also may cause the loss of useful substances.

[0003] After searching the patent literature CN118594041A discloses a defoaming device for flotation concentrate, which includes a flotation base, and a flotation component is fixedly connected to the top of the flotation base; the flotation base includes a separation tank, an annular overflow pipe is fixedly sleeved inside the separation tank, one end of the bottom of the annular overflow pipe located below the separation tank is fixedly communicated with a flotation concentrate inlet pipe, and a clamping hole is opened at the top of the separation tank. The above scheme has the common advantages of all physical defoaming technologies. It has the characteristics of high mechanization degree and convenient layout and installation of mechanical defoaming, and the advantages of good defoaming effect and fast speed of spray defoaming. It can fully and timely enhance the defoaming effect of flotation concentrate, adapt to all flotation concentrates with thick foam layers and difficult to defoam, covers multiple physical defoaming technologies, mechanical stirring is increased with spraying and screen plate filtration compared with the prior art, mechanical stirring and screen plate filtration are added compared with water spraying defoaming, and the structure is simple, the installation layout is convenient, the energy consumption is low, and the maintenance amount is small.

[0004] Although the above patent literature can avoid foam overflow and improve flotation recovery rate, the action 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. Factors such as the type, concentration, particle size, and type of foaming agent 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; for pulp containing coarse particles, ultrasonic defoaming may cause particle breakage, and existing defoaming devices usually lack targeted designs for different sizes of bubbles. Large bubbles require strong shear force, and small bubbles require promoting coalescence or accelerating rupture. It is difficult to take both into account, resulting in incomplete defoaming. At the same time, existing defoaming devices lack an effective circulation mechanism, resulting in uneven contact between the pulp and the defoaming device, and there are differences in defoaming effects. Some pulp may be insufficiently defoamed or over-defoamed, resulting in the loss of useful minerals. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the purpose of the present invention is to provide an antifoaming separation device and separation method for minerals, which effectively solve the problems existing in the prior art. The pulp foam is a complex solid-liquid-gas three-phase system. Factors such as the type, concentration, particle size, and foaming agent type of different pulps will affect the stability of the pulp foam. For pulps containing a large number of fine bubbles, conventional mechanical stirring or spraying is difficult to effectively defoam; for pulps containing coarse particles, ultrasonic defoaming may cause particle breakage, and existing defoaming devices usually lack targeted designs for different-sized bubbles. Large bubbles require strong shear force, and small bubbles require promoting coalescence or accelerating rupture. It is difficult to take both into account, resulting in incomplete defoaming. At the same time, existing defoaming devices lack an effective circulation mechanism, resulting in uneven contact between the pulp and the defoaming device, and differences in defoaming effects. Some pulps may be insufficiently defoamed or over-defoamed, leading to losses of valuable minerals.

[0006] To achieve the above object, the present invention provides the following technical solution: An antifoaming separation device for minerals, including a feed pipeline, further comprising a defoaming tank, a vacuum pump, and a PLC control system. The defoaming tank is connected to the feed pipeline. A moving plate is arranged inside the defoaming tank. A lifting assembly is connected to the bottom of the moving plate. A driving assembly is connected to the center of the top of the defoaming tank. An exhaust pipe is also connected to the top of the defoaming tank. The transmission shaft of the driving assembly extends into the interior of the defoaming tank. The transmission shaft is sequentially connected with a primary stirring assembly, a secondary stirring assembly, and a tertiary stirring assembly from top to bottom. The primary stirring assembly can adjust the blade angle by installing the adapter block in the normal or reverse direction. A solid-liquid separation assembly is arranged at the bottom of the moving plate. The vacuum pump is connected to the top of the defoaming tank through a negative pressure pipeline.

[0007] As a further improvement of the present invention, a booster pump and a stop valve are arranged on the feed pipeline. The lifting assembly includes two electric push rods. The top of the extending shaft of the electric push rod is connected with an electric push rod connection block. The electric push rod connection block is located at the bottom of the moving plate and is connected to it.

[0008] As a further improvement of the present invention, the defoaming tank further includes a defoaming tank cylinder body and a top cover. The top cover is located at the top of the defoaming tank cylinder body and is fixedly connected to it. A feed port is arranged on one side of the defoaming tank cylinder body. An exhaust port, a safety valve, and a negative pressure connection port are arranged on the top cover. The exhaust port is communicated with the exhaust pipe. A wire mesh foam remover and a one-way valve are arranged 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:

[0016] 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;

[0017] S2. Start the speed 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.

[0018] S3. Through the PLC control system, make the electric push rod perform periodic up and down movements. The frothy pulp in the defoaming tank barrel is circulated and defoamed, and the stable state of the solid-liquid-gas three-phase of the frothy pulp is destroyed, and the gas is discharged through the exhaust pipe.

[0019] S4. After a preset time, make the electric push rod return to the initial extended state and stop the operation of the speed reducer.

[0020] S5. Start the vacuum pump to create a negative pressure in the defoaming tank barrel, prompting the remaining bubbles in the frothy pulp in the defoaming tank barrel to burst.

[0021] S6. After the remaining bubbles burst, stop the operation of the vacuum pump, open the second solenoid valve to allow external gas to enter the defoaming tank barrel, and make the defoaming tank barrel return to normal pressure.

[0022] S7. Open the first solenoid valve. After the solid-liquid mixture in the defoaming tank barrel enters area A of the separation box body, close the first solenoid valve and the second solenoid valve.

[0023] S8. The liquid in area A of the separation box body enters area B of the separation box body through the partition plate and enters the designated pipeline through the drain port, and the solid remains at the bottom of area A of the separation box body, completing the solid-liquid separation.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) A defoaming and separation device for minerals provided by the present invention can efficiently defoam and separate solid and liquid of the frothy pulp after flotation, with 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.

[0026] (2) Through the coordinated cooperation of the first-stage stirring assembly, the second-stage stirring assembly, the third-stage stirring assembly, and the driving assembly, the present invention can not only use the cutting pieces on the first-stage stirring blades to quickly cut large bubbles and increase the bubble specific surface area, but also use the micropores on the second-stage stirring blades to promote the merger of small bubbles to form larger bubbles, and also use the hydrophobic layer on the surface of the third-stage stirring blades to accelerate the rupture of tiny bubbles, realizing the step-by-step and efficient defoaming of the frothy pulp. Specifically, when the driving assembly drives the transmission shaft to rotate, the third-stage stirring assembly rotates synchronously. The first-stage stirring assembly is responsible for cutting large bubbles, the second-stage stirring assembly is responsible for merging small bubbles, and the third-stage stirring assembly is responsible for accelerating the rupture of bubbles, ultimately realizing the efficient defoaming of the frothy pulp under the stirring action.

[0027] (3) Through the cooperation of the lifting assembly, the moving plate, and the defoaming tank cylinder body, the present invention can not only make the frothy pulp in the defoaming tank form a circulating flow, enabling the pulp to fully contact with each stage of the stirring assembly, improving the defoaming efficiency, but also prevent solid particles from depositing at the bottom of the defoaming tank, avoiding blockage, and ensuring the continuous and stable progress of the defoaming process. Specifically, when the lifting assembly drives the moving plate to reciprocate up and down, it drives each stage of the stirring assembly to move up and down within the defoaming tank cylinder body, causing the frothy pulp to form a circulating flow within the defoaming tank, thereby achieving full contact between the pulp and the stirring assembly, improving the defoaming efficiency, and at the same time preventing solid particle deposition.

[0028] (4) Through the cooperation of the vacuum pump, the negative pressure pipeline, the second solenoid valve, and the defoaming tank, the present invention can not only generate negative pressure within the defoaming tank, prompting the residual bubbles in the pulp to burst and achieving complete defoaming, but also slowly introduce air to smoothly restore normal pressure, avoiding secondary foaming, and ensuring the effect of subsequent solid-liquid separation. Specifically, when the vacuum pump is started, negative pressure is generated within the defoaming tank, accelerating the bursting of bubbles. After defoaming is completed, air is slowly introduced through the second solenoid valve to restore normal pressure, avoiding the generation of new bubbles due to rapid air intake and ensuring the thoroughness of defoaming.

[0029] (5) By installing the adapter block in the correct or reverse direction, the present invention can not only change the blade angle of the primary stirring assembly to adapt to different types of pulp, improving the defoaming effect, but also conveniently replace the worn blades, reducing the maintenance cost. Specifically, when dealing with different types of pulp, the installation direction of the adapter block can be adjusted to change the angle between the primary stirring blade and the horizontal plane, enabling it to reach the optimal defoaming angle, thereby improving the adaptability to different pulp and the defoaming efficiency. Brief Description of the Drawings

[0030] Figure 1 is the overall structural schematic diagram of the present invention;

[0031] Figure 2 is the connection schematic diagram of the moving plate and the lifting assembly of the present invention;

[0032] Figure 3 is the connection schematic diagram of each stirring assembly and the transmission shaft when the adapter block of the present invention is installed in the reverse direction;

[0033] Figure 4 is the present invention Figure 3 schematic diagram when the moving plate of reaches another extreme position;

[0034] Figure 5 is the structural schematic diagram of the primary stirring assembly when the adapter block of the present invention is installed in the reverse direction;

[0035] Figure 6 is the structural schematic diagram of the primary stirring assembly when the adapter block of the present invention is installed in the correct direction;

[0036] Figure 7 It is a schematic structural diagram of the first base of the present invention;

[0037] Figure 8 It is a schematic structural diagram of the adapter block of the present invention;

[0038] Figure 9 It is a schematic structural diagram of the secondary stirring assembly of the present invention;

[0039] Figure 10 It is a schematic structural diagram of the second base of the present invention;

[0040] Figure 11 It is a schematic structural diagram of the solid-liquid separation assembly of the present invention.

[0041] In the figure: 100, feed pipe; 101, booster pump; 102, stop valve; 200, defoaming tank; 210, defoaming tank cylinder; 211, feed inlet; 220, top cover; 221, exhaust port; 222, safety valve; 223, negative pressure connection port; 230, exhaust pipe; 231, check 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 connection block; 400, drive assembly; 410, reducer; 420, coupling; 430, transmission shaft; 500, primary stirring assembly; 510, first base; 511, 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, counterbore side; 530, first stirring blade; 531, cutting blade; 600, secondary stirring assembly; 610, second base; 611, fourth through hole; 612, fourth threaded hole; 620, second stirring blade; 621, fifth through hole; 700, tertiary stirring assembly; 710, third base; 720, third stirring blade; 800, solid-liquid separation assembly; 810, separation box; 811, liquid discharge port; 820, partition plate; 830, slag cleaning port; 900, negative pressure pipe; 901, vacuum pump; 902, second solenoid valve. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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).

[0047] The defoaming tank 200 further includes a defoaming tank cylinder body 210 and a top cover 220. The top cover 220 is located at the top of the defoaming tank cylinder body 210 and is fixedly connected thereto. One side of the defoaming tank cylinder body is provided with a feed inlet 211. After flotation, the frothy pulp is pumped into the defoaming tank 200 through the feed inlet 211 by the feed pipeline 100. The top cover 220 is provided with an exhaust port 221, a safety valve 222 and a negative pressure connection port 223. The exhaust port 221 is communicated with the exhaust pipe 230. The exhaust pipe 230 is provided with a wire mesh foam remover and a one-way valve 231. When the lifting assembly 300 moves up and down, the moving plate 240 slides inside the defoaming tank cylinder body 210 along the axis direction of the defoaming tank cylinder body 210. The defoaming tank cylinder body 210 is connected to the foundation through supports (not shown in the figure). The defoaming tank cylinder body 210 is usually provided with an observation window (not shown in the figure).

[0048] A first through hole 241 is formed in the center of the moving plate 240. A first sealing groove 242 is arranged inside the first through hole 241. A second sealing groove 243 is formed in the middle of the outer periphery of the moving plate 240. A discharge pipe 250 is also formed in the moving plate 240. A first solenoid valve 251 is arranged on the discharge pipe 250. The outlet of the first solenoid valve 251 is connected with a hose 252. The hose 252 is communicated with the solid-liquid separation assembly 800.

[0049] The driving assembly 400 further includes a speed reducer 410 and a coupling 420. The speed reducer 410 is located at 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 speed reducer 410, and the other end is connected to the transmission shaft 430. The transmission shaft 430 penetrates through the moving plate 240.

[0050] The first-stage stirring assembly 500 further includes 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 formed in the center of the first base 510. A plurality of inclined grooves 512 are formed on the outer periphery of the first base 510. A first threaded hole 513 is formed in the inclined groove 512. A second threaded hole 514 is formed below the first threaded hole 513. A third threaded hole 521 is formed in the adapter block 520. The third threaded hole 521 is a blind hole. A third through hole 522 is also formed in the adapter block 520. A counterbore side 523 is arranged on the inclined side of the adapter block 520 close to the third through hole 522. A plurality of cutting pieces 531 are arranged on the blade of the first stirring blade 530. As Figure 5 shown, when the first stirring blade 530 is fixedly installed by being reversely installed through the adapter block 520, the value range of the included angle θ1 between the first stirring blade 530 and the horizontal plane is 53 - 57 degrees, preferably 55 degrees. As Figure 6As shown, when the first stirring blade 530 is fixedly installed through the adapter block 520 in the correct orientation, the range of the angle θ1 between the first stirring blade 530 and the horizontal plane is 38 - 42 degrees, preferably 40 degrees. By installing the adapter block 520 in the correct orientation or reverse orientation, the blade angle of the primary stirring assembly 500 can be changed to adapt to different types of pulp, improving the defoaming effect.

[0051] 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, and a fourth threaded hole 612 is provided on the outer periphery of the second base 610. A fifth through hole 621 is provided on the second stirring blade 620. When the second stirring blade 620 is fixedly installed, the range of the angle θ2 between the second stirring blade 620 and the horizontal plane is 28 - 32 degrees, preferably 30 degrees. The fifth through hole 621 mainly serves as a micropore.

[0052] The tertiary stirring assembly 700 includes a third base 710 and a third stirring blade 720 connected thereto. A hydrophobic layer is applied on the third stirring blade 720. When the third stirring blade 720 is fixedly installed, the range of the angle θ3 between the third stirring blade 720 and the horizontal plane is 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 in sequence.

[0053] It is not difficult to understand that the maximum outer diameters of the primary stirring assembly 500, the secondary stirring assembly 600, and the tertiary stirring assembly 700 of the present invention decrease in sequence, which can not only ensure that the large bubbles in the upper part are fully cut, but also enable the small bubbles and micro - bubbles in the lower part to be effectively treated, achieving a comprehensive and thorough defoaming of the frothy pulp. Specifically, the primary stirring assembly 500 with a larger diameter is used to treat the larger bubbles in the upper part, and the secondary stirring assembly 600 and the tertiary stirring assembly 700 with gradually decreasing diameters are respectively used to treat the small bubbles and micro - bubbles in the middle and bottom parts. Through this design of gradually decreasing diameters, it is ensured that bubbles of various sizes in the pulp can be effectively treated, improving the thoroughness of defoaming.

[0054] The solid - liquid separation assembly 800 includes a separation box body 810, a partition plate 820, a slag - cleaning port 830, and a box body top cover. The separation box body 810 is connected to the foundation through supports (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 body 810 and divides the separation box body 810 into two regions A and B. A slag - cleaning port 830 is provided on the outside of region A, and a liquid - discharging port 811 is provided at the center of the bottom of region B. The box body top cover is located on the top of the separation box body 810 and is detachably connected thereto. The hose 252 passes through the box body top cover and extends into the interior of region A of the separation box body 810.

[0055] At the installation position of the first-stage stirring assembly 500 on the defoaming tank cylinder body 210, there is a maintenance door (not shown in the figure). Through the maintenance door, it is convenient to switch between the reverse installation and the forward installation of the adapter block 520 according to the type, concentration, particle size of the pulp, and the type of foaming agent. At the same time, a second solenoid valve 902 is also provided on the negative pressure pipeline 900.

[0056] The present invention also provides a separation method for a defoaming and separating device for minerals. The separation method includes the following steps;

[0057] S1. Start the booster pump 101. The frothed pulp after flotation flows into the defoaming tank cylinder body 210 through the feed pipeline 100. At this time, the electric push rod 310 is in a fully extended state;

[0058] 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;

[0059] S3. Through the PLC control system, make the electric push rod 310 perform periodic up and down movements. The frothed pulp in the defoaming tank cylinder body 210 is defoamed cyclically, and the stable state of the solid-liquid-gas three-phase of the frothed pulp is destroyed. The gas is discharged through the exhaust pipe 230;

[0060] S4. After a preset time, make the electric push rod 310 return to the initial extended state and stop the operation of the reducer 410;

[0061] S5. Start the vacuum pump 901 to generate negative pressure in the defoaming tank cylinder body 210, and prompt the remaining bubbles in the frothed pulp in the defoaming tank cylinder body 210 to burst;

[0062] S6. After the remaining bubbles burst, stop the operation of the vacuum pump 901, open the second solenoid valve 902, and make the outside air slowly enter the defoaming tank cylinder body 210 to make the defoaming tank cylinder body 210 return to normal pressure;

[0063] S7. Open the first solenoid valve 251. After the solid-liquid mixture in the defoaming tank cylinder body 210 enters the A area of the separation box body 810, close the first solenoid valve 251 and the second solenoid valve 902;

[0064] S8. The liquid in the A area of the separation box body 810 enters the B area of the separation box body 810 through the partition plate 820 and enters the designated pipeline through the drain port 811. The solid remains at the bottom of the A area of the separation box body 810 to complete the solid-liquid separation.

[0065] It is not difficult to understand that in the above step S6, in order to smoothly restore normal pressure and avoid secondary foaming, external gas is usually slowly introduced into the defoaming tank cylinder 210. For some easily oxidized pulp foams, nitrogen is usually introduced into 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 provided at the front end of the vacuum pump 901.

[0066] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. 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 pipe (100). A moving plate (240) is arranged inside the defoaming box (200). A second sealing groove (243) is provided on the outer periphery of the moving plate (240). 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). The driving assembly (400) 0) 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 an adapter block (520) with an inclined surface side, 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); The feed pipe (100) is provided with a booster pump (101) and a stop valve (102). The lifting assembly (300) comprises two electric push rods (310). The tops of the extended shafts of the electric push rods (310) are connected to electric push rod connection blocks (320). The electric push rod connection blocks (320) are located at the bottom of the moving plate (240) and connected thereto. The electric push rods (310) perform periodic up-and-down movements, and the foamed slurry in the defoaming box cylinder (210) is cyclically defoamed, and the solid-liquid-gas three-phase stable state of the foamed slurry is destroyed.

2. The defoaming and separation device for minerals according to claim 1, 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).

3. The defoaming and separation device for minerals according to claim 1, 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 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).

4. The defoaming and separation device for minerals according to claim 2, 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).

5. The defoaming and separation device for minerals according to claim 3, 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).

6. The defoaming and separation device for minerals according to claim 5, 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.

7. The defoaming and separation device for minerals according to claim 6, 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.

8. The defoaming and separation device for minerals according to claim 2, 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).

9. The separation method of the defoaming separation device for minerals according to any one of claims 1 to 8, 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 has passed, the electric push rod (310) is restored to an 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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