A device for desliming a flotation process slurry

Abstract

A kind of desliming device of flotation process ore pulp, including vertical cylinder, slurry inlet is arranged in the upper portion of vertical cylinder, slurry enters vertical cylinder in tangential direction by slurry inlet;The lower portion of the vertical cylinder is connected with slurry sand setting conical cylinder, slurry sand setting area is in slurry sand setting conical cylinder, and regulating valve is arranged in the bottom of slurry sand setting conical cylinder;Sealing end cover is arranged in the upper end of vertical cylinder, and argillaceous overflow pipe is arranged in the center position of the vertical cylinder, and the upper end of argillaceous overflow pipe extends sealing end cover;Argillaceous separation cavity is arranged concentrically between argillaceous overflow pipe and vertical cylinder, and argillaceous separation zone is in argillaceous separation cavity, and vortex settling zone is between argillaceous separation cavity and vertical cylinder.The graphite flotation slurry can be effectively deslimed by the utility model, and the comprehensive grade and comprehensive recovery rate of graphite concentrate product are improved.

Description

Technical Field

[0001] This utility model pertains to desliming devices for flotation minerals, specifically a desliming device for flotation of flake graphite ore. Background Technology

[0002] In many flotation mineral processing (flake graphite separation) industrial practices, desliming is not performed. In flake graphite separation screen practices without desliming, the ore slime will adsorb flotation reagents, interfere with the adhesion of air bubbles to graphite, and reduce the grade of graphite concentrate to some extent.

[0003] However, some companies have adopted desliming operations, which are crucial for the purification of flake graphite and cryptocrystalline graphite. Graphite ore desliming primarily aims to remove clayey gangue minerals and slime from the ore, thereby improving subsequent beneficiation efficiency and concentrate quality. The main conventional desliming methods and equipment are as follows: 1. Screening and Desliming: Fine mud is removed by screening through a 0.037mm (approximately 400 mesh) screen. The coarse ore particles on the screen are better preserved due to the good preservation of flakes, making it easier to obtain high-grade concentrate after flotation. The fine mud under the screen needs further treatment (such as hydraulic settling) to improve the recovery rate. During the screening process, the screen holes are easily clogged, resulting in low screening efficiency and poor selectivity.

[0004] 2. Hydraulic Classification and Desliming: A classification stage is added after grinding, using hydrocyclones to separate fine mineral slimes (such as clay and mica). This is suitable for the pretreatment stage of coarser graphite ore. The feed pressure of the hydrocyclone is generally 0.10–0.15 MPa, sometimes requiring ≥0.15 MPa (≈1.5 bar) to enhance centrifugal force and improve the recovery rate of fine particles (such as -200 mesh material). During the screening process, there is a serious problem of graphite entrainment in the slime product, affecting the graphite recovery rate.

[0005] 3. Pre-flotation desliming method: Desliming is performed before flotation to prevent the slime from coating graphite particles or consuming flotation reagents, thus affecting the flotation effect. It is often used in conjunction with dispersants (such as water glass) to inhibit slime agglomeration. Therefore, it has the problems of large usage of dispersants such as water glass, general desliming effect, and large amount of slime recycling. Utility Model Content

[0006] The technical problem to be solved by this utility model is: in view of the problems existing in the prior art, this utility model provides a desliming device for slurry in the flotation process.

[0007] To solve the above problems, this utility model is achieved through the following technical solution: A desliming device for flotation slurry includes a vertical cylinder with a slurry inlet at the top. The slurry enters the vertical cylinder tangentially through the slurry inlet. The lower part of the vertical cylinder is connected to a slurry settling cone, the inside of which is a slurry settling zone, and a regulating valve is provided at the bottom of the slurry settling cone. A sealing end cap is provided at the upper end of the vertical cylinder, and a mud overflow pipe is provided at the center of the vertical cylinder, with the upper end of the mud overflow pipe extending out of the sealing end cap. A concentric mud separation chamber is set between the mud overflow pipe and the vertical cylinder. The inside of the mud separation chamber is the mud separation zone, and the space between the mud separation chamber and the vertical cylinder is the vortex settling zone.

[0008] The slurry inlet is located at approximately one-quarter to one-fifth of the vertical length of the upper part of the vertical cylinder, and the slurry inlet is connected to a slurry inlet pipe.

[0009] The lower end of the mud overflow pipe is located at one-third of the way down from the top of the vertical cylinder, and the diameter of the mud overflow pipe is less than one-third of the diameter of the vertical cylinder.

[0010] An inclined annular overflow trough is installed at the upper end of the mud overflow pipe.

[0011] The mud separation chamber has a column at the top and a cone at the bottom, with the cone's flared end facing downwards and its lower end located at the lower quarter position of the vertical cylinder.

[0012] The sealing end cap is either a flat plate or a cone that is wider at the top and narrower at the bottom.

[0013] Compared with existing technologies, this invention has the following advantages: This invention can effectively deslim graphite flotation slurry. Under micro-vortex flow conditions, it achieves quasi-static desliming of graphite flotation rough concentrate or flotation medium slurry, which can effectively reduce flotation reagent consumption, improve the overall grade and recovery rate of graphite concentrate products, and has the characteristics of energy saving and consumption reduction. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the present invention; Figure 2 This is a top view of the present invention. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] This invention uses flake graphite ore as an example for illustration and is applicable to slurries in all flotation processes.

[0018] A desliming device for flotation pulp combines the structural features of cone classifiers and inclined plate thickeners, and ingeniously conceives a multi-layered superimposed cone structure.

[0019] like Figure 1 As shown, a desliming device for flotation slurry includes a vertical cylinder 1. A slurry inlet is provided at the upper part of the vertical cylinder 1. The slurry inlet is located at about one-quarter to one-fifth of the vertical length of the upper part of the vertical cylinder 1. The slurry enters the vertical cylinder 1 tangentially through the slurry inlet. The slurry inlet is connected to a slurry inlet pipe 2.

[0020] The bottom of the vertical cylinder 1 is connected to a slurry settling cone 4, the slurry settling cone 4 contains a slurry settling zone 5, and a regulating valve 6 is provided at the bottom of the slurry settling cone 4.

[0021] A sealing end cap 7 is provided at the upper end of the vertical cylinder 1. A mud overflow pipe 3 is provided at the center of the vertical cylinder 1. The upper end of the mud overflow pipe 3 extends out of the sealing end cap 7, and the lower end of the mud overflow pipe 3 is located at approximately one-third of the height of the top of the vertical cylinder 1. The diameter of the mud overflow pipe 3 is less than one-third of the diameter of the vertical cylinder 1. Preferably, the mud overflow pipe 3 can be designed with an open outlet, with an inclined annular overflow groove installed at the upper end of the overflow pipe. Alternatively, the overflow pipe port can be closed, and another pipe can be connected to the upper end of the mud overflow pipe 3 as the mud product outlet.

[0022] A mud separation chamber 8 is provided between the mud overflow pipe 3 and the vertical cylinder 1. The mud separation chamber 8, mud overflow pipe 3, and vertical cylinder 1 are coaxially arranged. The interior of the mud separation chamber 8 is a mud separation zone 9, and the space between the mud separation chamber 8 and the vertical cylinder 1 is a swirling sedimentation zone 10. The mud separation chamber 8 has a column at the top and a cone at the bottom, with the cone's flared end facing downwards. The lower end of the cone is located approximately one-quarter of the way down from the bottom of the vertical cylinder 1.

[0023] Furthermore, the sealing end cap 7 can be a flat plate or a cone that is wider at the top and narrower at the bottom. Since graphite is a suspended slurry, when the slurry enters, most of the graphite suspension layer gathers circumferentially towards the sealing end cap 7 at the top of the vertical cylinder 1. A small portion of the graphite, due to the formation of intergrowths with other gangue and other impurities, will settle near the cylinder wall area of ​​the vertical cylinder 1 under pressure due to foam rupture and flow into the slurry settling zone 5.

[0024] The working principle of this utility model: When feeding the slurry, first adjust the regulating valve 6 at the bottom of the slurry settling cone 4 to ensure continuous overflow from the mud overflow port (mud overflow pipe 3) and continuous discharge from the bottom, so that the entire cavity is filled with slurry. Then, under stable operating conditions (the feed and discharge rates or flow rates are relatively stable with no large fluctuations, and the overflow and underflow flow rates change little in a short period of time), the graphite flotation rough concentrate or flotation intermediate slurry is tangentially fed into the swirling settling zone 10 of the vertical cylinder 1. In the swirling settling zone 10, the relatively hydrophobic graphite minerals 11 in the slurry float up and are suspended at the upper end of the vertical cylinder 1 to form a graphite suspension layer 12. Some graphite minerals that break down due to pressure settle together with sandy minerals 13 into the slurry settling zone 5 to form a sandy settling layer 14. The sandy settling layer 14 is concentrated at the bottom of the slurry settling cone 4 and then discharged to form a non-mud product. The muddy material that is not easy to settle gathers in the muddy separation zone 9 and then rises through the lower end of the muddy overflow pipe 3. Under the action of the feeding pressure, it is discharged from the upper end of the muddy overflow pipe 3 into the vertical cylinder 1 to form a muddy product, thereby realizing the desliming of the slurry.

[0025] It should be noted that the above process includes three parts: 1. Graphite Mineral 11: Graphite is a layered structure formed by carbon atoms with sp² hybrid orbitals, with layers connected by van der Waals forces. This structure makes the graphite surface nonpolar and highly hydrophobic (not easily wetted by water). During flotation, hydrophobic mineral particles are more likely to adhere to air bubbles and thus float to the surface. 2. Sandy mineral 13: Due to its high density and the fact that it does not adhere to air bubbles, sandy mineral 13 will sink downwards into the slurry settling zone 5, forming a sandy settling layer 14. 3. Clay material: usually refers to extremely fine, clay-like mineral particles; this utility model combines the principles of classification (cyclone separator) and concentration (thickener). When the slurry is tangentially fed into the cyclone settling zone 10 of the vertical cylinder 1, under the action of centrifugal force, the sandy minerals 13 sink downwards, while the fine and light clay material settles very slowly and will enter the central clay separation chamber 8 with the cyclone, and finally move upwards and be discharged.

[0026] After the improvement, effective desliming of graphite flotation slurry can be achieved.

[0027] This utility model adopts a low-pressure feeding (<0.05MPa) or gravity feeding design, and achieves quasi-static desliming of graphite flotation rough concentrate or flotation medium slurry under micro-vortex flow state. It can effectively reduce the consumption of flotation reagents, improve the comprehensive grade and comprehensive recovery rate of graphite concentrate products, and has the characteristics of energy saving and consumption reduction.

[0028] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A desliming device for flotation process slurry, characterized in that: It includes a vertical cylinder (1), and a slurry inlet is provided at the upper part of the vertical cylinder (1). The slurry enters the vertical cylinder (1) tangentially through the slurry inlet. The lower part of the vertical cylinder (1) is connected to a slurry settling cone (4), the slurry settling cone (4) is a slurry settling zone (5), and a regulating valve (6) is provided at the bottom of the slurry settling cone (4). A sealing end cap (7) is provided at the upper end of the vertical cylinder (1), and a mud overflow pipe (3) is provided at the center of the vertical cylinder (1), with the upper end of the mud overflow pipe (3) extending out of the sealing end cap (7). A concentric mud separation chamber (8) is set between the mud overflow pipe (3) and the vertical cylinder (1). The inside of the mud separation chamber (8) is the mud separation zone (9), and the space between the mud separation chamber (8) and the vertical cylinder (1) is the swirling sedimentation zone (10).

2. The desliming device for flotation process slurry according to claim 1, characterized in that: The slurry inlet is located at about one-quarter to one-fifth of the vertical direction of the upper part of the vertical cylinder (1), and the slurry inlet is connected to a slurry inlet pipe (2).

3. A desliming device for flotation process slurry according to claim 1, characterized in that: The lower end of the mud overflow pipe (3) is located at one-third of the top of the vertical cylinder (1), and the diameter of the mud overflow pipe (3) is less than one-third of the diameter of the vertical cylinder (1).

4. A desliming device for flotation process slurry according to claim 3, characterized in that: An inclined annular overflow trough is installed at the upper end of the mud overflow pipe (3).

5. A desliming device for flotation process slurry according to claim 1, characterized in that: The mud separation chamber (8) has a column at the top and a cone at the bottom. The cone has a flared mouth facing downwards and the lower end of the cone is located at the lower quarter position of the vertical cylinder (1).

6. A desliming device for flotation process slurry according to claim 1, characterized in that: The sealing end cap (7) is a flat plate or a cone that is wider at the top and narrower at the bottom.

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