A coal slime flotation classification, deashing, and defoaming device

Abstract

This invention relates to the field of coal, specifically to a coal slime flotation classification, deashing, and defoaming device. The device includes a feed pipe, the outlet of which is tangentially connected to the interior of a cyclone cone. The interface between the outlet and the cyclone cone is sealed by a sealing ring. A suspension baffle is arranged inside the feed pipe, with honeycomb-shaped flow straighteners evenly distributed on its surface. This creates several honeycomb cavities on the baffle surface for the coal slime water to pass through. Each honeycomb cavity forms an angle with the feed pipe's feed direction. This invention significantly improves the mixing degree of coal slime water containing particles of various sizes before cyclone flotation, keeping the slurry in suspension and facilitating the desorption of heterogeneous fine slime from the concentrate surface.

Description

Technical Field

[0001] This invention relates to the field of coal, specifically to a coal slime flotation, grading, deashing, and defoaming device. Background Technology

[0002] Coal washing is the source technology for the clean and efficient utilization of coal, and flotation is one of its main processes. The basic principle of flotation is to separate useful minerals by utilizing the difference in hydrophilicity and hydrophobicity of the target mineral and gangue minerals. Bubbles, as the sole carriers of hydrophobic target minerals, adhere to hydrophobic particles to form stable mineralized bubbles. Under the action of buoyancy, these bubbles rise to the foam layer, achieving the purpose of enriching the hydrophobic particles. The timely rupture of the bubbles enriched in the foam layer facilitates the recovery of the particles.

[0003] In the flotation process, before cyclone flotation of coal slurry, the coal slurry needs to be thoroughly mixed to make it more homogeneous and improve the subsequent flotation efficiency. However, as the variety of particles of different sizes in the coal slurry increases, stratification is prone to occur before cyclone flotation, resulting in poor mixing. This is not conducive to keeping the slurry in suspension, nor to the desorption of heterogeneous fine mud from the concentrate surface, and therefore urgently needs to be addressed. Summary of the Invention

[0004] To avoid and overcome the technical problems existing in the prior art, the present invention provides a coal slime flotation classification, deashing, and defoaming device. The present invention significantly improves the mixing degree of coal slime water containing particles of various sizes before cyclone flotation, keeping the slurry in a suspended state and facilitating the desorption of heterogeneous fine slime from the concentrate surface.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A coal slime flotation classification deashing and defoaming device includes a feed pipe, the outlet of the feed pipe is connected to the interior of the cyclone cone along the tangential direction of the cyclone cone, and the interface between the outlet and the cyclone cone is sealed by a sealing ring.

[0007] A suspended baffle is arranged inside the feed pipe. The surface of the suspended baffle is evenly arranged with a honeycomb-shaped flow straightener, so that the surface of the suspended baffle forms several sets of honeycomb cavities for the coal slurry water to pass through. Each honeycomb cavity has an angle with the material inlet direction of the feed pipe.

[0008] As a further aspect of the present invention: the bottom of the vortex cone is provided with an underflow port for discharging fine mud, and an overflow pipe is arranged axially inside the vortex cone. The bottom of the overflow pipe extends to the underflow port for the entry of clean coal, and the top of the overflow pipe is provided with an overflow port extending to the outside of the vortex cone for the discharge of clean coal.

[0009] As a further aspect of the present invention: sprayers for eliminating foam are arranged at the upstream end of each suspension baffle inside the feed pipe.

[0010] As a further embodiment of the present invention: the sprayer includes an arc-shaped guide pipe that matches the shape of the top wall of the feed pipe, and spray heads are evenly arranged on the guide pipe along the radial direction of the feed pipe, with spray holes evenly opened on each spray head to form a range spray.

[0011] As a further embodiment of the present invention: the suspended baffle is arranged inclinedly in the feed pipe along the material inlet direction toward the feed pipe outlet direction, and each honeycomb cavity is provided with a corrugated plate in a wave-like shape.

[0012] As a further embodiment of the present invention: at least two sets of suspended baffles are arranged and evenly spaced along the length of the feed pipe.

[0013] As a further aspect of the present invention: the degree of coal slurry-water mixing is measured by the suspended baffle. for:

[0014]

[0015] Where α1 and α2 are both weight parameters;

[0016] γ is the sphericity correction factor;

[0017] The particles of coal slurry are classified according to their particle size, and there are n categories of particles in total;

[0018] k1, k2, k3...k n The content of different types of particles in coal slurry water;

[0019] R1, R2, R3...R n The average diameter of different types of particles in coal slurry water;

[0020] ε is the absolute value of the vertical gradient of the coal slurry water flow field;

[0021] v0 is the actual flow velocity of the coal slurry water after it leaves the suspended baffle;

[0022] θ is the tilt angle of the suspended partition;

[0023] r is the hydraulic radius of the feed pipe;

[0024] L is the distance that the coal slurry water flows through the feed pipe per unit time.

[0025] The suspended baffle is vertically bisected along the water inlet direction, a n and b n These represent the flow rates on the left and right sides of the suspended partition, respectively.

[0026] △U is the relative slip velocity of the particle measured with the particle center as the reference.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. This invention features a unique honeycomb structure arranged on the suspension baffle, forming multiple honeycomb cavities for the coal slurry water to pass through. By tilting the suspension baffle to a specific angle, the mixing degree of the coal slurry water containing particles of various sizes can be significantly improved before cyclone flotation, keeping the slurry in a suspended state and facilitating the desorption of heterogeneous fine mud from the concentrate surface. The arrangement of the corrugated plates creates turbulence in the passing fluid, further enhancing the mixing of the coal slurry water. After the suspended slurry enters the cyclone cone tangentially, it stratifies under gravity. Under centrifugal force, the heterogeneous fine mud, as a high-density material, is thrown towards the inner wall of the cyclone cone and spirals downwards, eventually exiting from the bottom outlet. Meanwhile, the concentrate, as a low-density product, concentrates at the center of the cyclone cone and spirals upwards along the overflow pipe under buoyancy, finally exiting from the overflow outlet.

[0029] 2. The arrangement of the guide pipe in this invention allows for multi-angle, divergent spraying of the coal slurry water in the feed pipe. The flotation concentrate foam is eliminated in real time under the spraying action, resulting in high defoaming efficiency. First, the flotation foam is eliminated, exposing the heterogeneous fine mud entrained in the foam triangle area to the slurry. Under the action of water spraying, it desorbs from the coal particle surface. Then, utilizing the working principle of a hydrocyclone, the slurry containing heterogeneous fine mud is deeply classified, achieving deep separation of heterogeneous fine mud and clean coal. This effectively solves the problem of "back ash" in flotation clean coal, improves the quality of clean coal products, and enhances flotation. Simultaneously, the water used for spraying can be recycled, saving water resources. The entire system has no moving parts, is simple to install and operate, occupies a small area, and is safe and easy to maintain.

[0030] 3. This invention establishes a corresponding formula for calculating the degree of coal-slurry mixing for the suspended baffle. Since the degree of coal-slurry mixing is quantitative, a higher degree of coal-slurry mixing indicates a higher degree of coal-slurry mixing. After obtaining other parameter information, the tilt angle of the suspended baffle can be calculated to achieve the set maximum mixing degree, thereby maximizing the mixing efficiency of the coal-slurry. In other special flotation processes, the corresponding arrangement angle of the suspended baffle can be calculated for the specific degree of coal-slurry mixing required, making the suspended baffle applicable to various flotation processes. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention.

[0032] Figure 2 This is a schematic diagram of the structure of the suspended partition in this invention.

[0033] Figure 3 This is a schematic diagram of the sprayer in this invention.

[0034] Figure 4 This is a schematic diagram of the structure of the spray head in this invention.

[0035] In the picture:

[0036] 1. Suspension baffle; 11. Rectifier plate; 111. Corrugated plate;

[0037] 2. Sprinkler; 21. Guide pipe; 22. Sprinkler head; 221. Sprinkler hole;

[0038] 3. Feed pipe; 31. Discharge port;

[0039] 4. Swirl cone; 41. Underflow outlet;

[0040] 5. Overflow pipe; 51. Overflow outlet. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please see Figures 1-4 In this embodiment of the invention, a coal slime flotation classification deashing and defoaming device includes a swirling cone 4 arranged in a vertical direction, a horizontally arranged feed pipe 3 connected to the top of the swirling cone 4, the feed pipe 3 being a straight pipe, and the discharge port 31 being tangentially arranged to the inner cavity of the swirling cone 4.

[0043] The bottom of the vortex cone 4 is an underflow port 41 for fine mud discharge. An overflow pipe 5 is arranged along its axial direction inside the vortex cone 4. The bottom of the overflow pipe 5 extends to the underflow port 41 for clean coal to enter. The top of the overflow pipe 4 extends to the outside of the vortex cone 4 and bends to form an overflow port 51 arranged in the horizontal direction for clean coal to be discharged.

[0044] After the suspended slurry enters the interior of the swirl cone 4 along the tangential direction, it stratifies under the action of gravity. Under the action of centrifugation, the heterogeneous fine mud in the swirl cone 4, as a high-density material, is thrown towards the inner wall of the swirl cone 4 and moves downward in a spiral motion, eventually being discharged from the bottom outlet 41. Meanwhile, the concentrate, as a light-density product, is concentrated in the center of the swirl cone 4 and spirals upward along the overflow pipe 4 under the action of buoyancy, eventually being discharged from the overflow outlet 51.

[0045] Before the coal slurry enters the vortex cone 4, a sprayer 2 is installed inside the feed pipe 3 to eliminate foam. The sprayer 2 includes an arc-shaped guide pipe 21, which is connected to an external liquid source. The guide pipe 21 is arranged in close contact with the top wall of the feed pipe 3, and spray heads 22 are arranged on its body. The spray heads 22 are arranged radially along the feed pipe 3. Each spray head 22 has spray holes 221 evenly distributed to form a diffused area spray.

[0046] An inclined suspended baffle 1 is also arranged at the downstream end of the sprayer 2 inside the feed pipe 3. The suspended baffle 1 is inclined towards the discharge port 31 along the flow direction inside the feed pipe 3.

[0047] The suspended baffle 1 has honeycomb-shaped flow straighteners 11 arranged on its surface. These flow straighteners 11 cooperate to form honeycomb cavities for the coal slurry water to pass through. The direction of each honeycomb cavity is parallel to the axis of the suspended baffle 1. When the suspended baffle 1 is tilted, the honeycomb cavity forms an angle with the incoming material direction of the feed pipe 3. Corrugated plates 111 are also arranged inside each honeycomb cavity to create turbulence in the fluid, thus achieving thorough mixing.

[0048] The coal slurry-water mixing degree index obtained by the suspended baffle 1 for:

[0049]

[0050] Coal slurry mixing index It mainly consists of two parts, the vertical component. Components in the horizontal direction composition.

[0051]

[0052] Wherein: α1 and α2 are both weight parameters; α1 is preferably 0.753, and α2 is preferably 0.247;

[0053] γ is the sphericity correction factor, preferably 0.75;

[0054] The particles of coal slurry are classified according to their particle size, and there are n categories of particles in total;

[0055] k1, k2, k3...k n The content of different types of particles in coal slurry water;

[0056] R1, R2, R3...R n The average diameter of different types of particles in coal slurry water;

[0057] The range from 1 to n indicates a gradual increase in particle size.

[0058] ε is the absolute value of the vertical gradient of the coal slurry water flow field.

[0059]

[0060] v0 is the actual flow velocity of the coal slurry water after leaving the suspended baffle 1, which is preferably 4 m / s;

[0061] θ is the tilt angle of the suspension partition 1;

[0062] r is the hydraulic radius of feed pipe 3;

[0063] L is the distance that the coal slurry water flows through per unit time in feed pipe 3;

[0064] The suspended baffle 1,a is vertically bisected along the water inlet direction. n and b n These represent the flow rates on the left and right sides of the suspended partition 1, respectively.

[0065] △U is the relative slip velocity of the particle measured with the particle center as the reference.

[0066] Coal slurry mixing index A larger value indicates a more turbulent flow field and a more uniform coal slurry mixture. The coal slurry mixing index is a quantitative indicator, determined based on actual process requirements. Therefore, the tilt angle of the suspended baffle 1 can be calculated from the required coal slurry mixing index. When the tilt angle θ of the suspended baffle 1 is set to 34°, the calculated... The value is the largest. Meanwhile, under different usage requirements, the required coal slurry mixing index can be determined. The corresponding arrangement angle of the suspended partition 1 was calculated.

[0067] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0068] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0069] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0070] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0071] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A coal slime flotation classification, deashing, and defoaming device, characterized in that, Includes a feed pipe (3), the outlet (31) of the feed pipe (3) is connected to the interior of the swirling cone (4) along the tangential direction of the swirling cone (4), and the interface between the outlet (31) and the swirling cone (4) is sealed by a sealing ring. A suspended baffle (1) is arranged inside the feed pipe (3). A honeycomb-shaped rectifier plate (11) is evenly arranged on the surface of the suspended baffle (1) so that the surface of the suspended baffle (1) forms several honeycomb cavities for the coal slurry water to pass through. Each honeycomb cavity has an angle with the material direction of the feed pipe (3). The suspended baffle (1) is arranged inclined in the feed pipe (3) towards the outlet (31) of the feed pipe (3) along the material feeding direction. Each honeycomb cavity is equipped with a corrugated plate (111) in a wave-like shape. The degree of coal slurry mixing is measured by the suspended baffle (1). for: Where α1 and α2 are both weight parameters; γ is the sphericity correction factor; The particles of coal slurry are classified according to their particle size, and there are n categories of particles in total; k1, k2, k3...k n The content of different types of particles in coal slurry water; R1, R2, R3...R n The average diameter of different types of particles in coal slurry water; ε is the absolute value of the vertical gradient of the coal slurry water flow field; v0 is the actual flow velocity of the coal slurry water after it leaves the suspended baffle (1); θ is the tilt angle of the suspension partition (1); r is the hydraulic radius of the feed pipe (3); L is the distance that the coal slurry water flows through per unit time in the feed pipe (3); The suspended baffle (1) is vertically bisected along the water inlet direction, a n and b n These represent the flow rates on the left and right sides of the suspended baffle (1), respectively. △U is the relative slip velocity of the particle measured with the particle center as the reference.

2. The coal slime flotation classification, deashing, and defoaming device according to claim 1, characterized in that, The bottom of the vortex cone (4) is provided with an underflow port (41) for fine mud to be discharged. An overflow pipe (5) is arranged axially inside the vortex cone (4). The bottom of the overflow pipe (5) extends to the underflow port (41) for clean coal to enter. An overflow port (51) extending to the outside of the vortex cone (4) is arranged at the top of the overflow pipe (5) for clean coal to be discharged.

3. The coal slime flotation classification, deashing, and defoaming device according to claim 2, characterized in that, The feed pipe (3) contains sprayers (2) for eliminating foam at the upstream end of each suspension baffle (1).

4. The coal slime flotation classification, deashing, and defoaming device according to claim 3, characterized in that, The sprayer (2) includes an arc-shaped guide pipe (21) that matches the shape of the top wall of the feed pipe (3). Spray heads (22) are evenly arranged on the guide pipe (21) along the radial direction of the feed pipe (3). Spray holes (221) are evenly opened on each spray head (22) to form a range spray.

5. The coal slime flotation classification, deashing, and defoaming device according to claim 1, characterized in that, At least two sets of suspended baffles (1) are arranged and evenly spaced along the length of the feed pipe (3).

Images