A foam capture and elimination device

Abstract

The present invention discloses a foam capturing and eliminating device, comprising a foam capturing mechanism and a foam eliminating mechanism, wherein the foam capturing mechanism conveys the captured foam to the foam eliminating mechanism for elimination, the foam capturing mechanism being arranged on the foam eliminating mechanism, the foam digging bucket comprising a rotating shaft, a bucket body, a protective tube and a plurality of foam digging units located in the bucket body, when the foam digging unit of the foam capturing mechanism rotates relative to the rotating shaft, the first scraper of the foam digging unit cuts the foam, and at the same time, the foam enters the foam containing chamber and is conveyed to the foam outlet driven by the rotation of the foam digging unit, and enters the foam inlet channel of the foam eliminating mechanism from the foam outlet for elimination of foam, compared with the technical scheme of pumping foam in the prior art, the present invention actively cuts, destroys and conveys the foam to the foam eliminating mechanism through the foam digging unit, thereby solving the technical problem of difficulty in capturing due to poor fluidity of ultra-stable foam and improving the efficiency of foam capturing and elimination of foam.

Description

Technical Field

[0001] The invention relates to the field of separation technology, in particular to a foam capture and elimination device. Background Art

[0002] Concentrators often use thickeners to concentrate flotation concentrates and tailings. The ultra-stable foam produced by flotation will accumulate on the thickener for a long time and cannot be effectively settled. The foam layer contains a large amount of concentrate. If it cannot be effectively recovered, a large amount of concentrate will be lost with the overflow water.

[0003] At present, the common defoaming methods used in the thickener of the mineral processing plant are spray defoaming, chemical defoaming, and high-pressure water defoaming. Spray defoaming is to dilute the foam with water while eliminating the foam by the gravity of droplets or water flow. Its disadvantage is that it consumes a lot of water resources and has a poor effect on viscous foam. At the same time, the addition of a large amount of clean water also reduces the working efficiency of the thickener; chemical defoaming is to spray chemicals on the thickener to change the tension of the foam so that the foam breaks by itself. The disadvantage is that the cost is high and the newly added chemicals may have an adverse effect on upstream and downstream production operations; high-pressure water defoaming is to use high-pressure water sprayed from an atomizing nozzle to impact and dilute the foam to make it break. The disadvantage is that the high-pressure atomized water has a weak impact on the foam and the defoaming efficiency is not high.

[0004] Chinese patent document publication number CN115155112A discloses a system and process for eliminating foam on a thickener by physical means, the system comprising: a foam capturing unit, an automatic lifting unit, a foam conveying unit, a foam eliminating unit and a discharging unit, the foam capturing unit being installed on a thickener beam through the automatic lifting unit, one end of the foam capturing unit extending into the foam layer, the other end being connected to one end of the foam conveying unit through a pipeline, the other end of the foam conveying unit being connected to one end of the foam eliminating unit through a pipeline, the other end of the foam eliminating unit being connected to one end of the discharging unit, and the other end of the discharging unit passing through the foam layer and being placed in a clarified water layer of the thickener. However, the applicant found that in this technical solution, the inverted cone foam capture unit mainly relies on the foam flowing to the vicinity of the inverted cone foam capture unit, being carried into the inverted cone bucket by the water flow, and then being pumped by the rotor pump to complete the foam capture. The foam capture method is passive, and the capture effect is acceptable when the foam is thin, but the foam on the thickener is a thick, long-accumulated, low-water-content ultra-stable foam. This ultra-stable foam is like a loose soil block, and the capture effect for this type of foam is extremely poor. Because this ultra-stable foam floats on the surface of the water layer, it is very dry, thick and hard, the foam integrity is very good, and the fluidity is poor. It only relies on the pump of the foam capture unit to absorb and capture the foam. In the actual application process, there are technical problems such as low foam capture efficiency and difficult pumping, which ultimately leads to low defoaming efficiency. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a foam capture and elimination device with high foam capture efficiency and simple structure.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A foam collecting and eliminating device comprises a foam collecting mechanism and a foam eliminating mechanism, wherein the foam collecting mechanism transports the captured foam to the foam eliminating mechanism for elimination, and the foam collecting mechanism is arranged on the foam eliminating mechanism; the foam collecting mechanism comprises a rotating shaft, a bucket body, a protective cylinder and a plurality of foam digging units located in the bucket body, the rotating shaft is arranged obliquely relative to the horizontal plane of the foam and is connected to the bucket body, the bucket body takes the rotating shaft as the central axis, a plurality of the foam digging units are arranged at intervals on the protective cylinder, and a foam outlet connected to the foam inlet channel of the foam eliminating mechanism is opened on the bucket body; the protective cylinder is sleeved on the rotating shaft and is rotatable relative to the rotating shaft, the foam digging unit comprises a first scraper, a second scraper, a third scraper and a protective cylinder, the first scraper is located between the rotating shaft and the inner wall of the bucket body, the second scraper is arranged at one end of the bucket body facing the foam side and is vertically connected to the first scraper, the third scraper is connected to the first scraper and the second scraper and is arranged in contact with the inner wall of the bucket body, and the space between the first scraper, the second scraper, the third scraper and the bucket body is a foam containing chamber.

[0008] As a further improvement of the above technical solution:

[0009] The bucket body is also provided with a drainage hole, and the height of the drainage hole is lower than the height of the foam outlet.

[0010] The bucket body is a hollow cone structure, including a bucket side plate and a bucket back plate. The bucket back plate is the small circular end face of the cone, and the bucket side plate is the side face of the cone. The bucket back plate of the bucket body is connected to the horizontal foam inlet channel of the foam elimination mechanism. On the vertical plane passing through the rotating axis, the angle between the bucket back plate and the horizontal plane is γ, and the bottom angle of the cone of the bucket body is δ, satisfying γ=δ.

[0011] The drainage hole and the foam outlet are arranged on the bucket back plate.

[0012] The protective tube is conical. On a vertical plane passing through the rotation axis, the projection line of the outer cone wall of the protective tube and the projection line of the foam horizontal plane have an angle α, and the projection line of the foam inlet channel of the foam elimination mechanism and the projection line of the foam horizontal plane have an angle β, satisfying α=β.

[0013] 30°≤α=β≤60°.

[0014] The foam capture mechanism also includes a drainage mechanism arranged on the bucket body, and the drainage mechanism includes a drainage baffle assembly and a drainage drive member. The drainage baffle assembly is arranged corresponding to the drainage hole and is used to adjust the size of the drainage hole under the drive of the drainage drive member.

[0015] The drainage baffle assembly includes a baffle and a slide groove, the two slide grooves are arranged opposite to each other and connected to the bucket body, the baffle is located between the two slide grooves and moves relative to the bucket body under the drive of the drainage drive member to adjust the size of the drainage hole.

[0016] There are multiple drain holes, which are arranged at intervals. The baffle is provided with multiple through holes corresponding to the drain holes. When the through holes and the drain holes are misaligned, the drain holes are closed. When the through holes and the drain holes are not misaligned, the drain holes are opened.

[0017] It also includes a rotation drive member and a mounting plate. The rotation drive member is mounted on the foam capture mechanism through the mounting plate. The rotation drive member is used to drive the protection tube to rotate relative to the rotation axis.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] The foam capturing and eliminating device of the present invention comprises a foam capturing mechanism and a foam eliminating mechanism. When the foam digging unit of the foam capturing mechanism rotates relative to the rotating shaft, the first scraper of the foam digging unit cuts the foam, and the foam enters the foam containing chamber at the same time. The foam digging unit is driven by the rotation of the protective tube to transport the foam to the foam outlet, and the foam enters the foam inlet channel of the foam eliminating mechanism from the foam outlet to be defoamed. Compared with the technical solution of pumping foam in the prior art, the present invention actively cuts, destroys and transports the foam to the foam eliminating mechanism through the foam digging unit, thereby solving the technical problem of difficulty in capturing due to poor fluidity of ultra-stable foam and improving the foam capturing and defoaming efficiency. Since the foam capturing mechanism is arranged on the foam eliminating mechanism, the distance of foam transmission is shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the foam capture and elimination device of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the foam capture and elimination device of the present invention (some parts are removed).

[0022] Figure 3 yes Figure 2 Top view of the .

[0023] Figure 4 yes Figure 3 Section view along line AA.

[0024] Figure 5It is a structural schematic diagram of the bubble digging unit and the protective tube of the present invention.

[0025] Figure 6 It is a schematic diagram of the structure of the foam capture and elimination device of the present invention (from another perspective).

[0026] Figure 7 yes Figure 6 A partial enlarged view of point B in the middle.

[0027] The symbols in the figure represent:

[0028] 1. Foam collecting mechanism; 11. Rotating shaft; 12. Bucket body; 121. Bucket side plate; 122. Bucket back plate; 1221. Drain hole; 1222. Foam outlet; 13. Foam digging unit; 131. First scraper; 132. Second scraper; 133. Third scraper; 14. Protective tube; 15. Drain mechanism; 151. Drain baffle assembly; 1511. Baffle; 1512. Slide; 1513. Flip plate; 152. Drain drive; 16. Rotating drive; 17. Mounting plate; 2. Foam eliminating mechanism. DETAILED DESCRIPTION

[0029] The present invention will be described in further detail below. Unless otherwise specified, the instruments or materials used in the present invention are commercially available.

[0030] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] like Figures 1 to 7 As shown, the foam capturing and eliminating device of this embodiment comprises a foam capturing mechanism 1 and a foam eliminating mechanism 2. The foam capturing mechanism 1 conveys the captured foam to the foam eliminating mechanism 2 for elimination. The foam capturing mechanism 1 comprises a bubble digging bucket, which is arranged on the foam eliminating mechanism 2; the bubble digging bucket comprises a rotating shaft 11, a bucket body 12, a protective cylinder 14 and a plurality of bubble digging units 13 located in the bucket body 12. The rotating shaft 11 is inclined relative to the horizontal plane of the foam and is connected to the bucket body 12. The bucket body 12 takes the rotating shaft 11 as the central axis. The plurality of bubble digging units 13 are evenly spaced and arranged on the protective cylinder 14 and are rotatable relative to the rotating shaft 11. A foam outlet 1222 connected to the foam inlet channel of the foam elimination mechanism 2 is provided on the body 12; the foam digging unit 13 includes a first scraper 131, a second scraper 132, and a third scraper 133. The first scraper 131 is located between the rotating shaft 11 and the inner wall of the bucket body 12, the second scraper 132 is arranged at one end of the bucket body 12 facing the foam side and is vertically connected to the first scraper 131, the third scraper 133 is connected to the first scraper 131 and the second scraper 132 and is arranged in contact with the inner wall of the bucket body 12, and the space between the first scraper 131, the second scraper 132, the third scraper 133 and the protective tube 14 is a foam accommodating chamber.

[0034] In the foam collecting and eliminating device of the present invention, when the foam collecting unit 13 of the foam collecting mechanism 1 rotates relative to the rotating shaft 11, the first scraper 131 of the foam collecting unit 13 cuts the foam, and at the same time, the foam enters the foam containing chamber and rotates in the foam collecting unit 13 ( Figure 1 The direction indicated by the arrow is the rotation direction of the foam digging unit 13) and is driven to the foam outlet 1222, and enters the foam inlet channel of the foam elimination mechanism 2 from the foam outlet 1222 for defoaming. Compared with the technical solution of pumping foam in the prior art, the present invention actively cuts, destroys, and transports the foam to the foam elimination mechanism 2 through the foam digging unit 13, which solves the technical problem of difficulty in capturing the ultra-stable foam due to poor fluidity and improves the efficiency of foam capture and defoaming. On the other hand, since the foam capture mechanism 1 is arranged on the foam elimination mechanism 2, the distance of foam transmission is shortened.

[0035] Compared with the technical solution in which the foam digging unit 13 does not have the third scraper 133 (only the first scraper 131 and the second scraper 132), the setting of the third scraper 133 of the present invention reduces the contact area between the foam and the inner wall of the bucket body 12, reduces the friction between the foam in the foam containing cavity and the inner wall of the bucket body 12, is beneficial to improving the foam cutting and conveying efficiency, and at the same time can prevent the concentrate powder from adhering to the inner wall of the bucket body 12 and causing the foam digging unit 13 to get stuck.

[0036] like Figure 2 , Figure 3 , Figure 7 As shown, the bucket body 12 is also provided with a drain hole 1221, and the height of the drain hole 1221 is lower than the height of the foam outlet 1222. Since the present invention adopts a rotary foam digging unit 13, the foam passes through the drain hole 1221 before entering the foam outlet 1222, and the water in the bucket body 12 flows out to separate the slurry and foam.

[0037] like Figure 2 , Figure 3 , Figure 4 As shown, the bucket body 12 is a hollow truncated cone structure, including a bucket side plate 121 and a bucket back plate 122. The bucket back plate 122 is located at one end of the bucket side plate 121 away from the foam side, the second scraper 132 is located at one end of the bucket side plate 121 close to the foam side, the first scraper 131 is located between the bucket back plate 122 and the second scraper 132, and the bucket back plate 122 and the second scraper 132 are arranged in parallel. The hollow truncated cone structure of the present invention is like a trumpet, and the trumpet mouth is arranged toward the foam. Compared with the technical solution using a barrel-shaped bucket body 12, the hollow truncated cone structure of the present invention has a larger contact area with the foam, can cut more foam, and has a higher foam capture efficiency.

[0038] like Figure 2 As shown, in this embodiment, the drain hole 1221 and the foam outlet 1222 are provided on the bucket back plate 122. In other embodiments, the drain hole 1221 can also be provided on the bucket side plate 121 for draining.

[0039] like Figure 4 As shown, in this embodiment, the protection cylinder 14 is cone-shaped. On the vertical plane passing through the rotating shaft 11, the projection line of the outer cone wall of the protection cylinder 14 and the projection line of the foam horizontal plane have an angle α, and the projection line of the foam inlet channel of the foam elimination mechanism 2 and the projection line of the foam horizontal plane have an angle β, satisfying α=β. Through such an arrangement, when the foam in the foam containing chamber reaches the highest point, the foam will slide into the foam elimination mechanism 2 along the outer wall of the protection cylinder 14 under the action of gravity for defoaming treatment, so that the foam can smoothly enter the foam elimination mechanism 2 and prevent the foam from accumulating in the foam elimination mechanism 2.

[0040] 30°≤α=β≤60°. Within this angle range, the foam can enter the foam elimination mechanism 2 more smoothly. In this embodiment, it is 30°.

[0041] like Figure 4 As shown, in this embodiment, on the vertical plane passing through the rotating axis 11, the bucket back plate 122 has an angle γ with the horizontal plane, and the bucket body 12 is a cone with a bottom angle δ, satisfying the relationship 0°<γ=δ<90°, and in this embodiment γ=δ=45°.

[0042] like Figure 7As shown, the foam capture mechanism 1 also includes a drain mechanism 15 disposed on the bucket body 12, and the drain mechanism 15 includes a drain baffle assembly 151 and a drain driving member 152. The drain baffle assembly 151 is disposed corresponding to the drain hole 1221, and is used to adjust the size of the drain hole 1221 under the drive of the drain driving member 152. By setting the drain baffle assembly 151, the size of the drain hole 1221 is adjusted, which is conducive to adjusting the size of the drain hole 1221 according to the actual foam water content. In this embodiment, the drain driving member 152 is a cylinder, which is fixed on the bucket back plate 122 of the bucket body 12 and is located outside the bucket body 12. Figure 7 The direction indicated by the middle arrow is the extension and retraction direction of the cylinder.

[0043] In this embodiment, the drain baffle assembly 151 includes a baffle 1511 and a slide groove 1512. The two slide grooves 1512 are arranged opposite to each other and connected to the bucket body 12. The baffle 1511 is located between the two slide grooves 1512 and moves relative to the bucket body 12 under the drive of the drain drive 152 to adjust the size of the drain hole 1221.

[0044] There are multiple drain holes 1221, which are arranged at intervals. The baffle 1511 is provided with multiple through holes corresponding to the drain holes 1221. When the through holes and the drain holes 1221 are misaligned, the drain holes 1221 are closed. When the through holes and the drain holes 1221 are not misaligned, the drain holes 1221 are opened. The size of the drain holes 1221 is changed according to the range of the overlapping sizes of the drain holes 1221 and the through holes.

[0045] The drain baffle assembly 151 includes a flip plate 1513, which is tilted on the baffle 1511 and arranged near the lower side of the through hole. The flip plate 1513 uses the difference in fluidity between foam and slurry to separate slurry and foam, which can reduce foam loss while draining liquid, helping to achieve efficient defoaming.

[0046] The foam collecting mechanism 1 of the present invention further comprises a rotary driving member 16 and a mounting plate 17 . The rotary driving member 16 is mounted on the foam digging bucket via the mounting plate 17 . The rotary driving member 16 is used to drive the protective tube 14 to rotate relative to the rotating shaft 11 .

[0047] In this embodiment, the rotary drive member 16 is a low-speed, high-torque permanent magnet motor.

[0048] The foam elimination mechanism 2 of this embodiment adopts a centrifugal impact ultra-stable foam elimination device disclosed in publication number CN113893582A, which will not be described in detail here.

[0049] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A foam capture and elimination device, comprising a foam capture mechanism (1) and a foam elimination mechanism (2), wherein the foam capture mechanism (1) transports the captured foam to the foam elimination mechanism (2) for elimination, and is characterized in that: The foam collecting mechanism (1) is arranged on the foam eliminating mechanism (2); The foam collecting mechanism (1) comprises a rotating shaft (11), a bucket body (12), a protective cylinder (14), and a plurality of foam digging units (13) located in the bucket body (12); the rotating shaft (11) is arranged obliquely relative to a foam horizontal plane and is connected to the bucket body (12); the bucket body (12) takes the rotating shaft (11) as a central axis; a plurality of foam digging units (13) are arranged at intervals on the protective cylinder (14); and a foam outlet (1222) connected to a foam inlet channel of a foam eliminating mechanism (2) is provided on the bucket body (12); The protective tube (14) is sleeved on the rotating shaft (11) and is rotatable relative to the rotating shaft (11); the foam digging unit (13) comprises a first scraper (131), a second scraper (132) and a third scraper (133); the first scraper (131) is located between the protective tube (14) and the inner wall of the bucket body (12); the second scraper (132) is arranged at one end of the bucket body (12) facing the foam side and is vertically connected to the first scraper (131); the third scraper (133) is connected to the first scraper (131) and the second scraper (132) and is arranged in contact with the inner wall of the bucket body (12); the space between the first scraper (131), the second scraper (132), the third scraper (133) and the bucket body (12) is a foam accommodating chamber; The bucket body (12) is also provided with a drainage hole (1221), and the height of the drainage hole (1221) is lower than the height of the foam outlet (1222); The bucket body (12) is in a hollow truncated cone structure, comprising a bucket side plate (121) and a bucket back plate (122); the bucket back plate (122) is a small round end surface of the truncated cone, the bucket side plate (121) is a side surface of the truncated cone, the bucket back plate (122) is connected to a horizontal foam inlet channel of a foam elimination mechanism (2), and on a vertical plane passing through the rotation axis (11), the angle between the bucket back plate (122) and the horizontal plane is γ, and the bottom angle of the truncated cone of the bucket body (12) is δ, satisfying γ=δ; The protective cylinder (14) is conical, and on a vertical plane passing through the rotation axis (11), a projection line of an outer conical wall of the protective cylinder (14) and a projection line of a foam horizontal plane have an included angle α, and a projection line of a foam inlet channel of the foam elimination mechanism (2) and a projection line of the foam horizontal plane have an included angle β, satisfying α=β.

2. The foam capture and elimination device according to claim 1, characterized in that: The drainage hole (1221) and the foam outlet (1222) are provided on the bucket back plate (122).

3. The foam capture and elimination device according to claim 1, characterized in that: 30°≤α=β≤60°。 4. The foam capture and elimination device according to any one of claims 1 to 3, characterized in that: The foam capture mechanism (1) further comprises a drainage mechanism (15) arranged on the bucket body (12); the drainage mechanism (15) comprises a drainage baffle assembly (151) and a drainage driving member (152); the drainage baffle assembly (151) is arranged corresponding to the drainage hole (1221) and is used to adjust the size of the drainage hole (1221) under the drive of the drainage driving member (152).

5. The foam capture and elimination device according to claim 4, characterized in that: The drain baffle assembly (151) comprises a baffle (1511) and a slide groove (1512), wherein the two slide grooves (1512) are arranged opposite to each other and connected to the bucket body (12), and the baffle (1511) is located between the two slide grooves (1512) and moves relative to the bucket body (12) under the drive of the drain driving member (152) to adjust the size of the drain hole (1221).

6. The foam trapping and elimination device according to claim 5, characterized in that: The drainage baffle assembly (151) further comprises a flip plate (1513), the baffle (1511) is provided with a through hole, and the flip plate (1513) is arranged obliquely on the baffle (1511) and close to the lower side of the through hole.

7. The foam capture and elimination device according to any one of claims 1 to 3, characterized in that: It also comprises a rotary drive member (16) and a mounting plate (17), wherein the rotary drive member (16) is mounted on the foam capture mechanism (1) via the mounting plate (17), and the rotary drive member (16) is used to drive the protective cylinder (14) to rotate relative to the rotating shaft (11).

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