A coal slime particle size-based energy cascade input flotation device and flotation method

Abstract

The present application relates to the field of flotation, and particularly relates to a kind of energy cascade input flotation equipment and flotation method based on coal slime granularity, there is stirring shaft coaxially arranged along the vertical direction in the flotation machine, at least two groups of stirring impeller at different heights are coaxially arranged on the stirring shaft, and particle size analyzer is arranged on the inner wall of the flotation machine to analyze the particle size of different liquid level slurry.The present application makes the flotation efficiency of each period reach maximization, and significantly reduces the flotation power consumption of the flotation machine.

Description

Technical Field

[0001] This invention relates to the field of flotation, specifically to an energy-gradient input flotation device and method based on coal slime particle size. Background Technology

[0002] Fine-particle coal separation is a challenging aspect of clean and efficient coal utilization. Wet coal washing is currently the main method for fine-particle coal separation, and flotation is one of the primary wet separation methods. Flotation utilizes the difference in hydrophobicity on the surface of coal slime to effectively separate target minerals from gangue minerals. Due to the different physicochemical properties of coal slime surfaces, their hydrophobicity varies significantly, leading to substantial differences in flotation efficiency under the same flotation conditions. In the initial stage of flotation, the coal quality is relatively good, and a lower rotational speed of the impeller in the flotation machine is sufficient to make the coal particles float. However, as the flotation process progresses, the coal quality deteriorates, requiring a higher rotational speed of the impeller to complete the mineralization of the coal particles, thereby enabling them to float and be captured.

[0003] However, the rotation speed of the impeller in the current flotation machine is relatively fixed. Depending on the different flotation conditions, it is impossible to keep the rotation speed of the impeller at the optimal level. It is also impossible to maximize the flotation efficiency at all stages of the flotation process. As a result, the flotation power consumption of the flotation machine remains high, and the production cost is high. Therefore, it is urgent to solve this problem. Summary of the Invention

[0004] To avoid and overcome the technical problems existing in the prior art, this invention provides an energy-gradient input flotation device based on coal slime particle size. This invention maximizes the flotation efficiency at each stage of flotation and significantly reduces the flotation power consumption of the flotation machine.

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

[0006] A coal slime particle size-based energy-gradient input flotation device includes a stirring shaft coaxially arranged vertically within the flotation machine. At least two sets of impellers at different heights are coaxially arranged on the stirring shaft. A particle size analyzer is mounted on the inner wall of the flotation machine to analyze the particle size of the slurry at different liquid levels. The stirring shaft is coaxially mounted on a reducer, which is connected to a drive motor via a transmission belt. The particle size analyzer is connected to the drive motor via a control module and adjusts the output energy of the drive motor based on real-time particle size information in the slurry to ensure that the impeller linear velocity V of the stirring impellers is... impeller for:

[0007]

[0008] Where: β is the energy loss constant;

[0009] γ is the spherical correction factor;

[0010] The particles in the slurry are classified according to their size, and there are n categories of particles in total;

[0011] k1, k2, k3, k4, ... k n This indicates the content of different types of particles in the slurry;

[0012] R1, R2, R3, R4, ... R n This indicates the average particle size of different types of particles within the slurry.

[0013] This represents the derivative of the horizontal displacement of the particle per unit time;

[0014] This represents the derivative of the vertical displacement of the particle per unit time.

[0015] This represents the derivative of the particle's motion per unit time.

[0016] K is an empirical constant;

[0017] R im Indicates the radius of the agitator impeller;

[0018] V R This indicates the volume corresponding to one revolution of the stirring impeller.

[0019] As a further embodiment of the present invention: K = 0.3036, β = 2.0034, γ = 0.75.

[0020] As a further embodiment of the present invention: a slurry inlet and a slurry outlet located below the slurry inlet are provided on the side wall of the flotation machine, an emergency outlet is provided at the bottom of the flotation machine, and a particle size analyzer is arranged between the slurry inlet and the slurry outlet.

[0021] As a further embodiment of the present invention: the particle size analyzer is arranged in multiple layers from top to bottom, and the particle size analyzers in each layer are evenly arranged around the flotation machine.

[0022] A flotation method based on the energy gradient input of coal slime particle size flotation equipment includes the following steps:

[0023] S1. Start the flotation machine and turn on each particle size analyzer;

[0024] S2. Classify the particles in the slurry according to their particle size;

[0025] S3. Based on the particle size information of the slurry analyzed by the particle size analyzer, adjust the impeller linear velocity V of the stirring impeller in real time. impeller .

[0026] As a further aspect of the present invention: in step S2: the particles in the slurry are divided into five categories;

[0027] The particle size of the first category is ≥0.5mm;

[0028] Particles of type 2 with a particle size of ≥0.25mm and a diameter of 0.5mm or greater;

[0029] Particles with a size greater than 0.25mm (or ≥ 0.125mm for Category III particles)

[0030] Particles with a particle size greater than 0.125mm (Class IV) have a particle size ≥ 0.075mm.

[0031] 0.075mm > Particle size of category 5.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] 1. This invention arranges multiple sets of particle size analyzers on the inner wall of the flotation machine to detect the particle size of the entire flotation machine from all angles. After establishing the formula for the optimal linear velocity of the impeller, the linear velocity of the stirring impeller can be adjusted in real time based on the obtained particle size information, so that the speed of the impeller is always maintained at the optimal state, thereby adapting to each stage of flotation, maximizing the flotation efficiency, and significantly reducing the flotation power consumption of the flotation machine. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the present invention.

[0035] In the picture:

[0036] 1. Flotation machine; 11. Slurry inlet; 12. Slurry outlet;

[0037] 13. Emergency discharge port; 14. Particle size analyzer;

[0038] 2. Agitator shaft; 21. Reducer; 22. Drive motor; 23. Agitator impeller;

[0039] 3. Control module. Detailed Implementation

[0040] 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.

[0041] Please see Figure 1In this embodiment of the invention, an energy cascade input flotation device and flotation method based on coal slime particle size are disclosed. The flotation machine 1 is cylindrical, with a reducer 21 installed on its top. The drive motor 22 installed on the flotation machine 1 is driven by the reducer 21 through a transmission belt. The stirring shaft 2 is coaxially fixed on the reducer 21, and the stirring shaft 2 extends axially into the flotation machine 1. Multiple sets of stirring impellers 23 are coaxially and evenly arranged on the stirring shaft 2 from top to bottom.

[0042] The flotation machine 1 has a slurry inlet 12 at the top of its side wall and a slurry outlet 12 at the bottom of its side wall. The flotation machine 1 also has an emergency outlet 13 at the bottom for emergency discharge of slurry.

[0043] Particle size analyzers 14 are evenly arranged on the inner wall of the flotation machine 1. Multiple sets of particle size analyzers 14 are arranged, each located between the slurry inlet 11 and the slurry outlet 12. Multiple layers of particle size analyzers 14 are evenly arranged at different heights from top to bottom, with each layer's analyzers evenly arranged circumferentially. Each particle size analyzer 14 detects the particle size information of the slurry and sends the information to the control module 3. After calculation, the control module 3 controls the output energy of the drive motor 22 to achieve the optimal impeller linear velocity for the stirring impeller 23. The units for output and input energy in this invention are joules.

[0044] The optimal impeller linear velocity V of impeller 23 impeller for:

[0045]

[0046] Where: β is the energy loss constant; preferably β = 2.0034;

[0047] γ is the spherical correction factor; preferably γ = 0.75;

[0048] The particles in the slurry are classified according to their size, and there are n categories of particles in total;

[0049] k1, k2, k3, k4, ... k n This indicates the content of different types of particles in the slurry;

[0050] R1, R2, R3, R4, ... R n This indicates the average particle size of different types of particles within the slurry.

[0051] This represents the derivative of the horizontal displacement of the particle per unit time;

[0052] This represents the derivative of the vertical displacement of the particle per unit time.

[0053] This represents the derivative of the particle's motion per unit time.

[0054] K is an empirical constant; preferably K = 0.3036.

[0055] R im This indicates the radius of the impeller 23;

[0056] V R This indicates the volume corresponding to one revolution of the stirring impeller 23.

[0057] The flotation process includes the following steps:

[0058] S1. Start the flotation machine 1 and turn on each particle size analyzer 14;

[0059] S2. Classify the particles in the slurry according to their particle size;

[0060] The particles in the slurry were divided into five categories;

[0061] The particle size of the first category is ≥0.5mm;

[0062] Particles of type 2 with a particle size of ≥0.25mm and a diameter of 0.5mm or greater;

[0063] Particles with a size greater than 0.25mm (or ≥ 0.125mm for Category III particles)

[0064] Particles with a particle size greater than 0.125mm (Class IV) have a particle size ≥ 0.075mm.

[0065] 0.075mm ≥ Particle size of Category 5.

[0066] S3. Based on the particle size information in the slurry analyzed by the particle size analyzer 14, adjust the impeller linear velocity V of the stirring impeller 23 in real time. impeller :

[0067]

[0068] Where: β is the energy loss constant;

[0069] γ is the spherical correction factor;

[0070] The particles in the slurry are classified according to their size, and there are n categories of particles in total;

[0071] k1, k2, k3, k4, ... k n This indicates the content of different types of particles in the slurry;

[0072] R1, R2, R3, R4, ... R n This indicates the average particle size of different types of particles within the slurry.

[0073] This represents the derivative of the horizontal displacement of the particle per unit time;

[0074] This represents the derivative of the vertical displacement of the particle per unit time.

[0075] This represents the derivative of the particle's motion per unit time.

[0076] K is an empirical constant;

[0077] R im This indicates the radius of the impeller 23;

[0078] V R This indicates the volume corresponding to one revolution of the stirring impeller 23.

[0079] In step S3, the impeller linear velocity V impeller for:

[0080]

[0081] F(M n ·V n )=β·f(r) 3 ·(∑V flow ) 2

[0082]

[0083] Where: α is the conversion coefficient;

[0084] F(M n ·V n ) is the energy input for the stirring impeller 23;

[0085] f(r) is the average radius of all particles in the flow field of flotation machine 1;

[0086] ∑V flow The average velocity of each particle in the flow field of flotation machine 1;

[0087] Vn l denoted as the average horizontal velocity of the particles in the flow field of flotation machine 1;

[0088] Vn v The average vertical velocity of the particles in the flow field of flotation machine 1;

[0089] The impeller 23 of this invention is model SF8 flotation machine impeller.

[0090] 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.

[0091] 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.

Claims

1. A flotation device based on the energy gradient input of coal slime particle size, characterized in that, A stirring shaft (2) is coaxially arranged in the vertical direction inside the flotation machine (1). At least two sets of stirring impellers (23) at different heights are coaxially arranged on the stirring shaft (2). A particle size analyzer (14) is arranged on the inner wall of the flotation machine (1) to analyze the particle size of the slurry at different liquid levels. The stirring shaft (2) is coaxially arranged on the reducer (21). The reducer (21) is connected to the drive motor (22) through a transmission belt. The particle size analyzer (14) is connected to the drive motor (22) through a control module (3) and adjusts the output energy of the drive motor (22) according to the real-time particle size information in the slurry so that the impeller linear velocity V of the stirring impeller (23) is increased. impeller for: Where: β is the energy loss constant; γ is the spherical correction factor; The particles in the slurry are classified according to their size, and there are n categories of particles in total; k1, k2, k3, k4, ... k n This indicates the content of different types of particles in the slurry; R1, R2, R3, R4, ... R n This indicates the average particle size of different types of particles within the slurry. This represents the derivative of the horizontal displacement of the particle per unit time; This represents the derivative of the vertical displacement of the particle per unit time. This represents the derivative of the particle's motion per unit time. K is an empirical constant; R im Indicates the radius of the stirring impeller (23); V R This indicates the volume corresponding to one revolution of the stirring impeller (23).

2. The energy-gradient input flotation device based on coal slime particle size according to claim 1, characterized in that, K=0.3036, β=2.0034, γ=0.

75.

3. The energy-graded flotation device based on coal slime particle size according to claim 1, characterized in that, The flotation machine (1) has a slurry inlet (11) and a slurry outlet (12) located below the slurry inlet (11) on its side wall. An emergency outlet (13) is provided at the bottom of the flotation machine (1). A particle size analyzer (14) is arranged between the slurry inlet (11) and the slurry outlet (12).

4. The energy-gradient input flotation device based on coal slime particle size according to claim 3, characterized in that, The particle size analyzer (14) is arranged in multiple layers from top to bottom, and the particle size analyzers in each layer are evenly arranged around the flotation machine (1).

5. A flotation method for a coal slime particle size-based energy-gradient input flotation device according to any one of claims 1 to 4, characterized in that, Includes the following steps: S1. Start the flotation machine (1) and turn on each particle size analyzer (14); S2. Classify the particles in the slurry according to their particle size; S3. Based on the particle size information in the slurry analyzed by the particle size analyzer (14), adjust the impeller linear velocity V of the stirring impeller (23) in real time. impeller .

6. The flotation method for an energy-graded flotation device based on coal slime particle size according to claim 5, characterized in that, In step S2: the particles in the slurry are divided into five categories; The particle size of the first category is ≥0.5mm; Particles of type 2 with a particle size of ≥0.25mm and a diameter of 0.5mm or greater; Particles with a size greater than 0.25mm (or ≥ 0.125mm for Category III particles) Particles with a particle size greater than 0.125mm (Class IV) have a particle size ≥ 0.075mm. 0.075mm > Particle size of category 5.

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