Stirring structure of flotation machine for electrolytic carbon residue treatment and flotation machine

Abstract

The invention discloses a stirring structure of a flotation machine for electrolytic carbon residue disposal and the flotation machine, and belongs to the technical field of flotation machines, the specific structure comprises a transmission shaft, a stirring rotor, a stirring stator and stator flow deflectors, the stirring rotor is fixedly connected to the lower end of the transmission shaft, and the stirring stator is fixedly connected to a supporting pipe by a circle; the transmission shaft is sleeved with the supporting pipe, the supporting pipe and the transmission shaft are kept coaxial, an annular cavity between the supporting pipe and the transmission shaft is used for conveying air and ore pulp into a flotation machine groove body, and the stator flow deflectors are evenly and fixedly connected to the flow guide cover plate in the circumferential direction; the flow guide cover plate is fixedly connected to the supporting pipe, the stator flow guide pieces are arranged outside the stirring stator, and the upper end of the supporting pipe is fixedly connected to the supporting frame. The flotation machine can eliminate spinning in the ore pulp stirring process, slow down ore pulp turbulence, guarantee the liquid level stability, and effectively avoid the situation that the flotation machine flows with too high turbulence intensity in a turbulence area and interferes with a flow dividing area and a foam area in the flotation process.

Description

Technical Field

[0001] The present invention belongs to the technical field of flotation machines for electrolytic carbon slag disposal, and specifically relates to a stirring structure of a flotation machine for electrolytic carbon slag disposal, and also relates to a flotation machine for electrolytic carbon slag disposal. Background Art

[0002] During the electrolytic production of aluminum metal, the generation of carbon slag is inevitable. The reasons for the generation of carbon slag are: (1) uneven combustion and selective oxidation of the carbon anode result in the shedding of carbon particles; (2) the carbon anode exfoliates carbon particles under the erosion and scouring of molten aluminum and electrolyte; (3) secondary reactions during electrolysis generate free solid carbon; (4) mechanical losses caused by improper operation. Among them, (1) is the main reason for the generation of carbon slag.

[0003] Due to being soaked and penetrated by the electrolyte, the electrolyte content in the carbon slag is very high, accounting for about 60%-70% of the weight of the carbon slag. Its components are mainly cryolite, sub-cryolite, a small amount of alumina and calcium fluoride.

[0004] To extract carbon and electrolyte from the carbon slag respectively, the flotation method is adopted. That is, taking advantage of the characteristics that these two substances are insoluble in water and have different specific gravities, they are separated under the action of flotation reagents.

[0005] The dilute pulp added with flotation reagents is fully mixed and then flows into the flotation machine for flotation. The flotation machine separates the carbon pulp above and flows it into the carbon pulp pool. The underflow material (electrolyte) flows into the precipitation tank from the side and is precipitated to obtain the electrolyte.

[0006] Flotation machines are further divided into two types according to different air supply methods: mechanical agitation self-aspirating type and mechanical agitation pneumatic type. For the former, the agitator completes the functions of inhaling air and dividing the air into fine bubbles while stirring; when the rotor rotates, a cavity is formed behind the blade, sucking in air, and the pulp bypassing the blade forms two columns of counter-rotating vortices, and the air is sucked to the vortex center by these vortices to form bubbles.

[0007] When the pulp thrown out by the impeller impacts the stator blade, new vortices are generated. When the turbulence intensity of the flotation machine in the turbulent flow zone is too high, its flow will interfere with the diversion zone and foam zone of the flotation process, resulting in unstable pulp liquid level and the phenomenon of turning over, which is not conducive to the separation of materials. Summary of the Invention

[0008] The technical problem to be solved by the present invention is: to provide a stirring structure of a flotation machine for electrolytic carbon slag disposal, which can eliminate the self-rotation of the pulp during the flotation process of electrolytic carbon slag, slow down the pulp turbulence, ensure a stable liquid level, and improve the material separation effect.

[0009] The technical solution adopted by the present invention is as follows: A stirring structure for a flotation machine used in the disposal of electrolytic carbon slag, which is used for the flotation machine for the disposal of electrolytic carbon slag, includes a transmission shaft, a stirring rotor, a stirring stator and stator guide vanes. The stirring rotor is fixedly connected to the lower end of the transmission shaft. The stirring stator is fixedly connected to the support pipe and surrounds the stirring rotor. The support pipe is sleeved outside the transmission shaft and is coaxial with it. The annular chamber between the support pipe and the transmission shaft is used to convey air and pulp into the flotation machine tank body. Multiple stator guide vanes are provided and are circumferentially and uniformly fixedly connected to the guide cover plate. The guide cover plate is fixedly connected to the support pipe, and multiple stator guide vanes are arranged outside the stirring stator. The transmission shaft is connected to a power mechanism (composed of a power motor and a belt drive mechanism), and the power mechanism is installed on the support frame at the top of the flotation machine. The upper end of the support pipe is fixedly connected to the support frame. The bottom of the support pipe is provided with a feed port and a discharge port. Installing the improved stirring structure on the flotation machine can eliminate the self-rotation during the pulp stirring process, slow down the pulp turbulence, ensure the liquid level is stable, and effectively avoid the interference of excessive turbulence intensity in the turbulent flow area of the flotation machine on the diversion area and foam area of the flotation process.

[0010] Further, the above-mentioned stirring rotor includes a rotor bottom plate and rotor blades. The rotor bottom plate is fixedly connected to the transmission shaft. Multiple rotor blades are used and are circumferentially and uniformly fixedly connected to the upper part of the rotor bottom plate and are installed at a radial deflection angle with respect to the transmission shaft, that is, deflected by an angle α clockwise or counterclockwise. The stirring stator includes a stator cover plate and stator blades. The stator cover plate is fixedly connected to the outside of the lower end of the support pipe. Multiple stator blades are used and are circumferentially and uniformly fixedly connected to the bottom of the stator cover plate and are installed at a radial deflection angle with respect to the transmission shaft, that is, the stator blades are deflected by an angle β in the opposite rotation direction to the rotor blades; the stator guide vanes are installed at a radial deflection angle with respect to the transmission shaft, that is, the stator guide vanes are deflected by an angle δ in the opposite rotation direction to the stator blades, and the range of δ is 0° < δ ≤ 45°.

[0011] Further, the above-mentioned stator guide vanes adopt straight plates with equal thickness, trapezoidal plates with variable thickness or curved blades.

[0012] Further, the above-mentioned stator guide vanes correspond to the stator blades and are arranged in a star shape.

[0013] Further, the above-mentioned stator guide vanes adopt multiple groups of asymmetrically arranged guide blades.

[0014] A flotation machine for the disposal of electrolytic carbon slag includes a flotation machine body and the above-mentioned stirring structure is installed on the flotation machine body through a support frame.

[0015] Advantages of the present invention: Compared with the prior art, the present invention adds stator guide vanes outside the stator, which can eliminate the self-rotation of the pulp, slow down the pulp turbulence, ensure the liquid level is stable, improve the material separation effect, and effectively avoid the problem that the excessive turbulence intensity of the turbulence area of the flotation machine will interfere with the diversion area and the foam area of the flotation process, resulting in an unstable pulp liquid level and the phenomenon of splashing, which is unfavorable for the material separation. Through experimental verification: Compared with the previous stirring structure, the stirring structure of the present invention has a 45% increase in the calorific value of the carbon powder product, a 43% increase in fixed carbon, a 40% reduction in ash content, and a 54% reduction in volatile matter. Description of the Drawings

[0016] Figure 1 It is a schematic bottom view structure diagram of the stirring structure of the flotation machine for electrolytic carbon slag disposal;

[0017] Figure 2 is Figure 1 the schematic sectional view structure diagram of A-A in

[0018] Figure 3 It is a three-dimensional schematic diagram (rotating) of the stirring structure of the flotation machine;

[0019] Figure 4 Schematic plane layout diagram of the rotor-stator-guide vane of the stirring structure of the flotation machine;

[0020] Figure 5 Schematic plane layout diagram of the non-symmetrically arranged rotor-stator-guide vane of the stirring structure of the flotation machine. Detailed Embodiments

[0021] The present invention will be further introduced below in conjunction with the drawings and specific embodiments.

[0022] Example 1: As Figures 1-5As shown in the figure, a stirring structure of a flotation machine for electrolytic carbon slag disposal, which is used for a flotation machine for electrolytic carbon slag disposal, includes a transmission shaft 4, a stirring rotor 1, a stirring stator 2 and stator guide vanes 3. The stirring rotor 1 is fixedly connected to the lower end of the transmission shaft 4. The stirring stator 2 is fixedly connected to the support pipe 6 and surrounds the stirring rotor 1. The support pipe 6 is sleeved outside the transmission shaft 4 and is coaxial with it. The annular chamber 7 between the support pipe 6 and the transmission shaft 4 is used to convey air and pulp into the flotation machine tank body. A plurality of stator guide vanes 3 are provided and are circumferentially and uniformly fixedly connected to the guide cover plate 5. The guide cover plate 5 is fixedly connected to the support pipe 6, and the plurality of stator guide vanes 3 are arranged outside the stirring stator 2. The transmission shaft 4 is connected to a power mechanism (composed of a power motor and a belt drive mechanism), and the power mechanism is installed on the support frame at the top of the flotation machine. The upper end of the support pipe 6 is fixedly connected to the support frame. The bottom of the support pipe 6 is provided with a feed inlet 8 and a discharge outlet 9. Installing the improved stirring structure on the flotation machine can eliminate the self-rotation during the pulp stirring process, slow down the pulp turbulence, ensure the liquid level is stable, effectively avoid the problem that the excessive turbulence intensity of the flotation machine in the turbulence area will interfere with the diversion area and the foam area of the flotation process, resulting in an unstable pulp liquid level, the phenomenon of splashing and being unfavorable to the material separation. Through experimental verification: Compared with the previous stirring structure, the calorific value of the carbon powder product of the stirring structure of the present invention is increased by 45%, the fixed carbon is increased by 43%, the ash content is reduced by 40% and the volatile matter is reduced by 54%.

[0023] Among them, the stirring rotor 1 includes a rotor bottom plate 10 and rotor blades 11. The rotor bottom plate 10 is fixedly connected to the transmission shaft 4. A plurality of rotor blades 11 are used and are circumferentially and uniformly fixedly connected to the upper part of the rotor bottom plate 10 and are installed at a radial deflection angle with respect to the transmission shaft 4, that is, deflected clockwise or counterclockwise by an angle α. The stirring stator 2 includes a stator cover plate 12 and stator blades 13. The stator cover plate 12 is fixedly connected to the outside of the lower end of the support pipe 6. A plurality of stator blades 13 are used and are circumferentially and uniformly fixedly connected to the bottom of the stator cover plate 12 and are installed at a radial deflection angle with respect to the transmission shaft 4, that is, the stator blades 13 are deflected by an angle β in the opposite rotation direction to the rotor blades 11; the stator guide vanes 3 are installed at a radial deflection angle with respect to the transmission shaft 4, that is, the stator guide vanes 3 are deflected by an angle δ in the opposite rotation direction to the stator blades 13, and the range of δ is 0° < δ ≤ 45°, which can ensure the best effect.

[0024] Specifically, the stator guide vanes 3 are made of straight plates with equal thickness, trapezoidal plates with variable thickness or curved blades.

[0025] Specifically, the stator guide vanes 3 correspond to the stator blades 13 and are arranged in a star shape.

[0026] Example 2: As Figure 4 shown, different from Example 1, the stator guide vanes 3 adopt a plurality of groups of asymmetrically arranged guide vanes, and the asymmetric arrangement can enhance the liquid level stability at the discharge end of the scraper according to the pulp turbulence degree.

[0027] Example 3: A flotation machine for disposing electrolytic carbon slag, comprising a flotation machine body and the stirring structure of Example 1 or Example 2, which is installed on the flotation machine tank through a support frame, and the stirring structure can extend into the flotation machine tank for stirring.

[0028] During the operation of the flotation machine, the pulp thrown out by the impeller of the stirring structure impacts the stator blades, forming a turbulent flow area vortex at the bottom of the flotation machine. When the turbulence intensity is too small, a dead zone will appear at the bottom, affecting the flotation effect. When the turbulence intensity is too large, it will interfere with the diversion area and foam area of the flotation process, resulting in an unstable pulp liquid level and a phenomenon of splashing, which is not conducive to the separation of materials.

[0029] To solve the above problems existing in the operation of the flotation machine, the present invention installs stator guide vanes outside the stator blades to further improve the properties of the gas, liquid, and solid phases in the flotation system. After the liquid flow passes through the stator, it is evenly distributed along the horizontal section under the guiding action of the guide vanes. The lower part of the tank is the stirring area, which maximally eliminates the dead zone; the upper part of the tank is a relatively stable flotation separation area, effectively avoiding the self-rotation of the pulp, slowing down the pulp turbulence, and meeting the requirements of the flotation process.

[0030] Compared with the prior art, after implementing this patent, the self-rotation of the pulp is effectively avoided, the pulp turbulence is slowed down, the liquid level in the upper part of the tank is relatively stable, and the quality of the flotation carbon powder product is effectively improved. As shown in Table 1, compared with the previous stirring structure of the present invention, the calorific value of the carbon powder product is increased by 45%, the fixed carbon is increased by 43%, the ash content is reduced by 40%, and the volatile matter is reduced by 54%.

[0031] Table 1. Comparison of the quality of flotation carbon powder products before and after the implementation of the patent

[0032] Item Calorific value (cal / g) Fixed carbon (%) Ash content (%) Volatile matter (%) Carbon powder product before patent implementation 2674 48.76 47.83 3.41 Carbon powder product after patent implementation 3877 69.74 28.69 1.57

[0033] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. Stirring structure of a flotation machine for electrolytic carbon slag disposal, characterized in that It includes a transmission shaft (4), a stirring rotor (1), a stirring stator (2) and stator guide vanes (3). The stirring rotor (1) is fixedly connected to the lower end of the transmission shaft (4). The stirring stator (2) is fixedly connected to the support pipe (6) and is located around the stirring rotor (1). The support pipe (6) is sleeved outside the transmission shaft (4). The annular chamber (7) between the support pipe (6) and the transmission shaft (4) is used to convey air and pulp into the flotation machine tank body. Multiple stator guide vanes (3) are provided and are circumferentially and uniformly fixedly connected to the guide cover plate (5). The guide cover plate (5) is fixedly connected to the support pipe (6), and the multiple stator guide vanes (3) are arranged outside the stirring stator (2). The transmission shaft (4) is connected to a power mechanism, and the power mechanism is installed on the support frame at the top of the flotation machine. The upper end of the support pipe (6) is fixedly connected to the support frame, and the bottom of the support pipe (6) is provided with a feed inlet (8) and a discharge outlet (9).

2. The stirring structure of a flotation machine for electrolytic carbon slag disposal according to claim 1, wherein, The stirring rotor (1) includes a rotor bottom plate (10) and rotor blades (11). The rotor bottom plate (10) is fixedly connected to the transmission shaft (4). Multiple rotor blades (11) are used and are circumferentially and uniformly fixedly connected to the upper part of the rotor bottom plate (10) and are installed at a radial deflection angle with respect to the transmission shaft (4), that is, deflected by an angle α clockwise or counterclockwise. The stirring stator (2) includes a stator cover plate (12) and stator blades (13). The stator cover plate (12) is fixedly connected to the outside of the lower end of the support pipe (6). Multiple stator blades (13) are used and are circumferentially and uniformly fixedly connected to the bottom of the stator cover plate (12) and are installed at a radial deflection angle with respect to the transmission shaft (4), that is, the stator blades (13) are deflected by an angle β in the opposite rotation direction to the rotor blades (11).

3. The stirring structure of a flotation machine for electrolytic carbon slag disposal according to claim 2, characterized in that, The stator guide vanes (3) are installed at a radial deflection angle with respect to the transmission shaft (4), that is, the stator guide vanes (3) are deflected by an angle δ in the opposite rotation direction to the stator blades (13), and the range of δ is 0° < δ ≤ 45°.

4. The stirring structure of a flotation machine for disposing electrolytic carbon slag according to claim 1, characterized in that, The stator guide vanes (3) are made of straight plates with equal thickness, trapezoidal plates with variable thickness or curved blades.

5. The stirring structure of a flotation machine for electrolytic carbon slag disposal according to claim 2, characterized in that, The stator guide vanes (3) correspond to the stator blades (13) and are arranged in a star shape.

6. The stirring structure of a flotation machine for electrolytic carbon slag disposal according to claim 1, characterized in that, The stator guide vanes (3) are composed of multiple groups of asymmetrically arranged guide blades.

7. A flotation machine for disposing electrolytic carbon slag, characterized in that, It includes a flotation machine tank body and a stirring structure according to any one of claims 1 - 6, which is installed on the flotation machine tank body through a support frame, and the stirring structure can extend into the flotation machine tank body for stirring.

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