Process and device for removing heavy metal ions in sewage through flotation method

Abstract

The invention discloses a process and device for removing heavy metal ions in sewage through a flotation method, and relates to the technical field of sewage flotation. The flotation device comprises a flotation tank and a rotating motor, the flotation tank is of a cylindrical hollow structure, an opening is formed in the upper end of the flotation tank, a supporting plate is installed at the opening of the flotation tank, the supporting plate is of an arc-shaped structure, the rotating motor is installed on the supporting plate, and a shell of the rotating motor is fixedly connected with the supporting plate; the output end of the rotating motor is fixedly connected with a gear, and a sleeve is installed on one side of the gear. According to the device, the flotation tank is filled with sewage, the air pipe is communicated with the air conveying device, the air pipe guides air into the bubble disperser, the bubble disperser scatters the air to form tiny bubbles, the tiny bubbles are attached to heavy metal particles and drive the heavy metal particles to float, and due to rotation of the sleeve, the sewage body is driven to rotate; and the foam layer is led out along the side guide pipe of the tank body.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage flotation, and in particular relates to a process and a device for removing heavy metal ions in sewage by a flotation method. Background Art

[0002] The basic principle of flotation is to introduce air into sewage, dissolve the air in water under a certain pressure, form a supersaturated state, and then release tiny bubbles under reduced pressure. The bubbles produced by this method are small in diameter, evenly distributed, and have a good flotation effect. A large number of tiny bubbles are produced, so that the pollutant particles in the water adhere to the bubbles and float to the water surface with the bubbles to form a foam layer, and then the foam layer is removed to separate the pollutants from the water. From the existing technology, the common sewage flotation device uses bubbles to adsorb on the surface of heavy metals, so that the metal ions float and are collected, but the adsorption rate of bubbles is not high, and the water in the flotation tank often rotates with a small amplitude. The metal ions that sink to the bottom are often difficult to adsorb with bubbles, and the use of scrapers for collection can easily cause the bubbles to burst, causing the metal ions to fall back into the sewage, reducing the flotation efficiency. For this reason, we propose a process and device for removing heavy metal ions from sewage by flotation. Summary of the invention

[0003] The purpose of the present invention is to provide a process and device for removing heavy metal ions in sewage by flotation method, so as to solve the problem that existing sewage flotation devices are prone to material splashing and dripping during sewage flotation process.

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] The present invention discloses a process and device for removing heavy metal ions in sewage by flotation method, comprising a flotation tank and a rotating motor, wherein the flotation tank is a cylindrical hollow structure, and an opening is provided at the upper end of the flotation tank, a support plate is installed at the opening of the flotation tank, the support plate is an arc-shaped structure, and a rotating motor is installed on the support plate, a shell of the rotating motor is fixedly connected to the support plate, a gear is fixedly connected to the output end of the rotating motor, a sleeve is installed on one side of the gear, the sleeve is a cylindrical hollow structure, and openings are provided at both the upper and lower ends of the sleeve, gear blocks are evenly installed at one end of the sleeve close to the gear, and a bubble disperser is installed at one end of the sleeve away from the gear, the gear is meshed with the gear blocks on the sleeve, an air pipe is installed inside the sleeve, the air pipe is inserted in the sleeve, one end of the air pipe extends into the sleeve, and the other end of the air pipe is connected to a gas transmission device.

[0006] Preferably, a discharge port is provided at the center of the bottom end of the flotation tank, and a discharge pipe is installed at the discharge port, a valve is installed on the discharge pipe, and a conduit is installed at the side of the upper opening of the flotation tank.

[0007] Preferably, the bubble disperser is rotatably connected to the bottom end of the flotation tank, and the bubble disperser is rotatably connected to the outside of the discharge port of the flotation tank, and there is a gap between the bubble disperser and the bottom end of the flotation tank.

[0008] Preferably, the bubble disperser is a cylindrical hollow structure, and exhaust holes are evenly opened on the arc-shaped side of the bubble disperser, and the exhaust holes of the bubble disperser are connected to the air pipe.

[0009] Preferably, a cross bar is installed on the outside of the sleeve, one end of the cross bar is fixedly connected to the outer arc surface of the sleeve, and the other end of the cross bar is fixedly connected to a scraper, the two groups of scrapers are in an arc structure, and the convex side of the scraper is close to the inner wall of the flotation tank.

[0010] Preferably, a base is installed on the side of the flotation tank away from the opening, one side of the base is fixedly connected to the flotation tank, and a bracket is installed on the side of the base away from the flotation tank, and the bracket is fixedly connected to the flotation tank.

[0011] A process for removing heavy metal ions from sewage by flotation method comprises the following steps:

[0012] S1: Connect the air pipe to the air delivery device and connect the rotating motor to the power supply;

[0013] S2: Stirring and mixing, adding sewage into the flotation tank and stirring;

[0014] S3: Adding active agent into the flotation tank to fully blend the active agent with the sewage;

[0015] S4: Air is introduced into the flotation tank to form a large number of tiny bubbles. The heavy metal particles adsorbed by the collector collide with the bubbles and adhere to them, floating to the water surface along with the bubbles to form a foam layer;

[0016] S5: The foam layer continues to rise to the top of the flotation tank and is guided out of the flotation tank through a conduit. The foam layer contains the floated heavy metal particles, while the wastewater at the bottom contains less heavy metals.

[0017] Preferably, in the above step S2, the rotation rate of the sleeve in the flotation tank is 10-12 r / min.

[0018] Preferably, in the above step S3, the added active agent is copper sulfate.

[0019] Preferably, in the above step S4, the diameter of the bubbles is between 0.1 and 0.4.

[0020] The present invention has the following beneficial effects:

[0021] 1. The present invention fills the flotation tank with sewage, connects the air supply device through the air pipe, introduces the air into the bubble disperser, and uses the bubble disperser to break up the air to form tiny bubbles. The tiny bubbles attach to the heavy metal particles and float with the heavy metal particles. Due to the rotation of the sleeve, the sewage body is driven to rotate, so that the foam layer is led out along the side guide of the tank body for collection.

[0022] 2. The present invention utilizes a motor to drive the sleeve to rotate, and the sleeve is fixedly connected to the scraper, so that the scraper rotates, which is convenient for cleaning the foam and metal particles attached to the inner wall of the flotation tank, and improving the removal efficiency of the metal particles in the sewage. Since the rotation of the scraper drives the water body to rotate, the upper foam layer is convenient for being discharged along the side conduit.

[0023] 3. The present invention selects copper sulfate as the active agent. The copper sulfate will chemically react with the metal ion surface in the sewage to form a metal sulfide film, which enhances the adsorption capacity of the mineral surface to the collector and facilitates the capture and adsorption of bubbles.

[0024] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0026] Figure 1 This is a schematic diagram of the overall structure of a device for removing heavy metal ions from sewage by a flotation method according to the present invention;

[0027] Figure 2 This is a schematic diagram of the overall structure of a device for removing heavy metal ions from sewage by a flotation method according to the present invention from another angle;

[0028] Figure 3 This is a cross-sectional view of the overall structure of a device for removing heavy metal ions from sewage by a flotation method according to the present invention;

[0029] Figure 4 This is a cross-sectional view of the overall structure of a device for removing heavy metal ions from sewage by a flotation method according to the present invention from another angle;

[0030] Figure 5 The present invention is a process flow chart of a flotation method for removing heavy metal ions from sewage.

[0031] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0032] 1. Flotation tank; 2. Support plate; 3. Rotating motor; 4. Gear; 5. Gear block; 6. Sleeve; 7. Bubble disperser; 8. Cross bar; 9. Scraper; 10. Air pipe; 11. Discharge pipe; 12. Base; 13. Bracket; 14. Conduit. DETAILED DESCRIPTION

[0033] 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.

[0034] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner", "lower", "all around" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0035] See also Figure 1-5 As shown, the present invention is a process and device for removing heavy metal ions in sewage by flotation method, comprising a flotation tank 1 and a rotating motor 3, the flotation tank 1 is a cylindrical hollow structure, and an opening is provided at the upper end of the flotation tank 1, a support plate 2 is installed at the opening of the flotation tank 1, the support plate 2 is an arc-shaped structure, and the rotating motor 3 is installed on the support plate 2, the housing of the rotating motor 3 is fixedly connected to the support plate 2, the output end of the rotating motor 3 is fixedly connected to the gear 4, a sleeve 6 is installed on one side of the gear 4, the sleeve 6 is a cylindrical hollow structure, and openings are provided at both upper and lower ends of the sleeve 6, a tooth block 5 is evenly installed on one end of the sleeve 6 close to the gear 4, and the sleeve 6 is away from the gear 4. A bubble disperser 7 is installed at one end of the wheel 4, the gear 4 is meshed with the tooth block 5 on the sleeve 6, an air pipe 10 is installed inside the sleeve 6, the air pipe 10 is inserted into the sleeve 6, one end of the air pipe 10 extends into the sleeve 6, and the other end of the air pipe 10 is connected to the air delivery device. The flotation tank 1 is filled with sewage, and the air delivery device is connected by the air pipe 10. The air is introduced into the bubble disperser 7 by the air disperser 7, and the air is dispersed to form tiny bubbles by the bubble disperser 7. The tiny bubbles are attached to the heavy metal particles and float with the heavy metal particles. Due to the rotation of the sleeve 6, the sewage body is driven to rotate, so that the foam layer is led out along the side guide tube 14 of the tank body for collection.

[0036] Among them, a discharge port is opened at the center of the bottom end of the flotation tank 1, and a discharge pipe 11 is installed at the discharge port position, a valve is installed on the discharge pipe 11, a conduit 14 is installed at the side of the upper end opening of the flotation tank 1, the bubble disperser 7 is rotatably connected to the bottom end of the flotation tank 1, and the bubble disperser 7 is rotatably connected to the outside of the discharge port of the flotation tank 1, there is a gap between the bubble disperser 7 and the bottom end of the flotation tank 1, the bubble disperser 7 is a cylindrical hollow structure, and the arc-shaped side of the bubble disperser 7 is evenly provided with exhaust holes, the exhaust holes of the bubble disperser 7 are connected to the air pipe 10, a cross bar 8 is installed on the outside of the sleeve 6, one end of the cross bar 8 is fixedly connected to the outer arc surface of the sleeve 6, and the cross bar 8 A scraper 9 is fixedly connected to the other end, and the two groups of scrapers 9 are in an arc-shaped structure, and the convex side of the scraper 9 is in close contact with the inner wall of the flotation tank 1. A base 12 is installed on the side of the flotation tank 1 away from the opening, and one side of the base 12 is fixedly connected to the flotation tank 1, and a bracket 13 is installed on the side of the base 12 away from the flotation tank 1, and the bracket 13 is fixedly connected to the flotation tank 1. The sleeve 6 is driven to rotate by a motor, and the sleeve 6 is fixedly connected to the scraper 9, so that the scraper 9 rotates, which is convenient for cleaning the foam and metal particles attached to the inner wall of the flotation tank 1, and improving the removal efficiency of the metal particles in the sewage. Because the rotation of the scraper 9 drives the water body to rotate, it is convenient for the upper foam layer to be discharged along the side guide tube 14.

[0037] A process for removing heavy metal ions from sewage by flotation method comprises the following steps:

[0038] S1: Connect the air pipe 10 to the air delivery device and connect the rotating motor 3 to the power supply;

[0039] S2: Stirring and mixing, adding the sewage into the flotation tank 1 and stirring;

[0040] S3: adding an active agent into the flotation tank 1 so that the active agent and the sewage are fully integrated;

[0041] S4: Air is introduced into the flotation tank 1 to form a large number of tiny bubbles. The heavy metal particles adsorbed by the collector collide with the bubbles and adhere to the bubbles, and float to the water surface together with the bubbles to form a foam layer;

[0042] S5: The foam layer continuously rises to the top of the flotation tank and is guided out of the flotation tank 1 through the conduit 14. The foam layer contains the floated heavy metal particles, while the wastewater at the bottom contains less heavy metals.

[0043] Among them, in the above step S2, the rotation rate of the sleeve 6 in the flotation tank 1 is 10-12r / min, in the above step S3, the added activator is copper sulfate, and copper sulfate is selected as the activator. Copper sulfate will react chemically with the metal ion surface in the sewage to form a layer of metal sulfide film, which enhances the adsorption capacity of the mineral surface to the collector and facilitates the capture and adsorption of bubbles. In the above step S4, the diameter of the bubble is between 0.1-0.4.

[0044] The following is the working principle of the present invention:

[0045] See also Figure 1-5 As shown, the present invention is a process and device for removing heavy metal ions in sewage by flotation method. The method of using the process is as follows: the flotation tank 1 is filled with sewage, and the air pipe 10 is used to connect the air supply device, and the air pipe 10 introduces air into the bubble disperser 7, and the air is dispersed by the bubble disperser 7 to form tiny bubbles, and the tiny bubbles are attached to the heavy metal particles and float with the heavy metal particles, and an activating agent is added to the sewage, and copper sulfate is selected as the activating agent. The copper sulfate will react chemically with the metal ion surface in the sewage to form a metal sulfide film, which enhances the adsorption capacity of the mineral surface to the collector and facilitates the capture and adsorption of bubbles, and the sleeve 6 is driven to rotate by a motor, and the sleeve 6 is fixedly connected to the scraper 9, so that the scraper 9 rotates, which is convenient for cleaning the foam and metal particles attached to the inner wall of the flotation tank 1, and improving the removal efficiency of the metal particles in the sewage. Since the rotation of the scraper 9 drives the water body to rotate, it is convenient for the upper foam layer to be discharged along the side guide 14.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0047] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A device for removing heavy metal ions from sewage by flotation, comprising a flotation tank (1) and a rotating motor 3, characterized in that: The flotation tank (1) is of a cylindrical hollow structure, and an opening is provided at the upper end of the flotation tank (1). A support plate (2) is installed at the opening of the flotation tank (1), and the support plate (2) is of an arc-shaped structure. A rotating motor (3) is installed on the support plate (2), and a housing of the rotating motor (3) is fixedly connected to the support plate (2). A gear (4) is fixedly connected to the output end of the rotating motor (3), and a sleeve (6) is installed on one side of the gear (4). The sleeve (6) is of a cylindrical hollow structure. The sleeve (6) is provided with openings at both upper and lower ends. A tooth block (5) is evenly mounted on the end of the sleeve (6) close to the gear (4), and a bubble disperser (7) is mounted on the end of the sleeve (6) away from the gear (4). The gear (4) meshes with the tooth block (5) on the sleeve (6). An air pipe (10) is mounted inside the sleeve (6), the air pipe (10) is inserted into the sleeve (6), one end of the air pipe (10) extends into the sleeve (6), and the other end of the air pipe (10) is connected to a gas transmission device.

2. The device for removing heavy metal ions from sewage by flotation method according to claim 1, characterized in that: The flotation tank (1) is provided with a discharge port at the center of the bottom end, and a discharge pipe (11) is installed at the discharge port. A valve is installed on the discharge pipe (11). A guide tube (14) is installed at the side of the upper opening of the flotation tank (1).

3. The device for removing heavy metal ions from sewage by flotation method according to claim 2, characterized in that: The bubble disperser (7) is rotatably connected to the bottom end of the flotation tank (1), and the bubble disperser (7) is rotatably connected to the outside of the discharge port of the flotation tank (1), and a gap exists between the bubble disperser (7) and the bottom end of the flotation tank (1).

4. The device for removing heavy metal ions from sewage by flotation method according to claim 1, characterized in that: The bubble disperser (7) is a cylindrical hollow structure, and exhaust holes are evenly arranged on the arc-shaped side of the bubble disperser (7), and the exhaust holes of the bubble disperser (7) are connected to the air pipe (10).

5. The device for removing heavy metal ions from sewage by flotation method according to claim 4, characterized in that: A cross bar (8) is installed on the outer side of the sleeve (6), one end of the cross bar (8) is fixedly connected to the outer arc surface of the sleeve (6), and the other end of the cross bar (8) is fixedly connected to a scraper (9), the two groups of scrapers (9) are in an arc-shaped structure, and the convex side of the scraper (9) is in close contact with the inner wall of the flotation tank (1).

6. The device for removing heavy metal ions from sewage by flotation method according to claim 5, characterized in that: A base (12) is installed on the side of the flotation tank (1) away from the opening, one side of the base (12) is fixedly connected to the flotation tank (1), and a bracket (13) is installed on the side of the base (12) away from the flotation tank (1), the bracket (13) is fixedly connected to the flotation tank (1).

7. A process for removing heavy metal ions from sewage by flotation, characterized in that: The following steps are involved: S1: Connect the air pipe (10) to the air delivery device and connect the rotating motor (3) to the power supply; S2: stirring and mixing, adding the sewage into the flotation tank (1) and stirring; S3: adding an active agent into the flotation tank (1) so that the active agent and the sewage are fully mixed; S4: Air is introduced into the flotation tank (1) to form a large number of tiny bubbles. The heavy metal particles adsorbed by the collector collide with the bubbles and adhere to the bubbles, and float to the water surface together with the bubbles to form a foam layer; S5: The foam layer continues to rise to the top of the flotation tank and is guided out of the flotation tank (1) through the conduit (14). The foam layer contains the floated heavy metal particles, while the wastewater at the bottom contains less heavy metals.

8. The process for removing heavy metal ions from sewage by flotation method according to claim 7, characterized in that: In the above step S2, the rotation rate of the sleeve (6) in the flotation tank (1) is 10-12 r / min.

9. The process for removing heavy metal ions from sewage by flotation method according to claim 7, characterized in that: In the above step S3, the added active agent is copper sulfate.

10. The process for removing heavy metal ions from sewage by flotation method according to claim 7, characterized in that: In the above step S4, the diameter of the bubble is between 0.1 and 0.4.

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